clang-1/lib/AST/Expr.cpp

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//===--- Expr.cpp - Expression AST Node Implementation --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Expr class and subclasses.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Expr.h"
#include "clang/AST/APValue.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/TargetInfo.h"
#include <algorithm>
using namespace clang;
//===----------------------------------------------------------------------===//
// Primary Expressions.
//===----------------------------------------------------------------------===//
PredefinedExpr* PredefinedExpr::Clone(ASTContext &C) const {
return new (C) PredefinedExpr(Loc, getType(), Type);
}
IntegerLiteral* IntegerLiteral::Clone(ASTContext &C) const {
return new (C) IntegerLiteral(Value, getType(), Loc);
}
CharacterLiteral* CharacterLiteral::Clone(ASTContext &C) const {
return new (C) CharacterLiteral(Value, IsWide, getType(), Loc);
}
FloatingLiteral* FloatingLiteral::Clone(ASTContext &C) const {
return new (C) FloatingLiteral(Value, IsExact, getType(), Loc);
}
ImaginaryLiteral* ImaginaryLiteral::Clone(ASTContext &C) const {
// FIXME: Use virtual Clone(), once it is available
Expr *ClonedVal = 0;
if (const IntegerLiteral *IntLit = dyn_cast<IntegerLiteral>(Val))
ClonedVal = IntLit->Clone(C);
else
ClonedVal = cast<FloatingLiteral>(Val)->Clone(C);
return new (C) ImaginaryLiteral(ClonedVal, getType());
}
GNUNullExpr* GNUNullExpr::Clone(ASTContext &C) const {
return new (C) GNUNullExpr(getType(), TokenLoc);
}
/// getValueAsApproximateDouble - This returns the value as an inaccurate
/// double. Note that this may cause loss of precision, but is useful for
/// debugging dumps, etc.
double FloatingLiteral::getValueAsApproximateDouble() const {
llvm::APFloat V = getValue();
bool ignored;
V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
&ignored);
return V.convertToDouble();
}
StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData,
unsigned ByteLength, bool Wide,
QualType Ty,
const SourceLocation *Loc,
unsigned NumStrs) {
// Allocate enough space for the StringLiteral plus an array of locations for
// any concatenated string tokens.
void *Mem = C.Allocate(sizeof(StringLiteral)+
sizeof(SourceLocation)*(NumStrs-1),
llvm::alignof<StringLiteral>());
StringLiteral *SL = new (Mem) StringLiteral(Ty);
// OPTIMIZE: could allocate this appended to the StringLiteral.
char *AStrData = new (C, 1) char[ByteLength];
memcpy(AStrData, StrData, ByteLength);
SL->StrData = AStrData;
SL->ByteLength = ByteLength;
SL->IsWide = Wide;
SL->TokLocs[0] = Loc[0];
SL->NumConcatenated = NumStrs;
if (NumStrs != 1)
memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
return SL;
}
StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) {
void *Mem = C.Allocate(sizeof(StringLiteral)+
sizeof(SourceLocation)*(NumStrs-1),
llvm::alignof<StringLiteral>());
StringLiteral *SL = new (Mem) StringLiteral(QualType());
SL->StrData = 0;
SL->ByteLength = 0;
SL->NumConcatenated = NumStrs;
return SL;
}
StringLiteral* StringLiteral::Clone(ASTContext &C) const {
return Create(C, StrData, ByteLength, IsWide, getType(),
TokLocs, NumConcatenated);
}
void StringLiteral::Destroy(ASTContext &C) {
Overhaul of Stmt allocation: - Made allocation of Stmt objects using vanilla new/delete a *compiler error* by making this new/delete "protected" within class Stmt. - Now the only way to allocate Stmt objects is by using the new operator that takes ASTContext& as an argument. This ensures that all Stmt nodes are allocated from the same (pool) allocator. - Naturally, these two changes required that *all* creation sites for AST nodes use new (ASTContext&). This is a large patch, but the majority of the changes are just this mechanical adjustment. - The above changes also mean that AST nodes can no longer be deallocated using 'delete'. Instead, one most do StmtObject->Destroy(ASTContext&) or do ASTContextObject.Deallocate(StmtObject) (the latter not running the 'Destroy' method). Along the way I also... - Made CompoundStmt allocate its array of Stmt* using the allocator in ASTContext (previously it used std::vector). There are a whole bunch of other Stmt classes that need to be similarly changed to ensure that all memory allocated for ASTs comes from the allocator in ASTContext. - Added a new smart pointer ExprOwningPtr to Sema.h. This replaces the uses of llvm::OwningPtr within Sema, as llvm::OwningPtr used 'delete' to free memory instead of a Stmt's 'Destroy' method. Big thanks to Doug Gregor for helping with the acrobatics of making 'new/delete' private and the new smart pointer ExprOwningPtr! git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63997 91177308-0d34-0410-b5e6-96231b3b80d8
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C.Deallocate(const_cast<char*>(StrData));
this->~StringLiteral();
C.Deallocate(this);
}
void StringLiteral::setStrData(ASTContext &C, const char *Str, unsigned Len) {
if (StrData)
C.Deallocate(const_cast<char*>(StrData));
char *AStrData = new (C, 1) char[Len];
memcpy(AStrData, Str, Len);
StrData = AStrData;
ByteLength = Len;
}
/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
/// corresponds to, e.g. "sizeof" or "[pre]++".
const char *UnaryOperator::getOpcodeStr(Opcode Op) {
switch (Op) {
default: assert(0 && "Unknown unary operator");
case PostInc: return "++";
case PostDec: return "--";
case PreInc: return "++";
case PreDec: return "--";
case AddrOf: return "&";
case Deref: return "*";
case Plus: return "+";
case Minus: return "-";
case Not: return "~";
case LNot: return "!";
case Real: return "__real";
case Imag: return "__imag";
case Extension: return "__extension__";
case OffsetOf: return "__builtin_offsetof";
}
}
UnaryOperator::Opcode
UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
switch (OO) {
default: assert(false && "No unary operator for overloaded function");
case OO_PlusPlus: return Postfix ? PostInc : PreInc;
case OO_MinusMinus: return Postfix ? PostDec : PreDec;
case OO_Amp: return AddrOf;
case OO_Star: return Deref;
case OO_Plus: return Plus;
case OO_Minus: return Minus;
case OO_Tilde: return Not;
case OO_Exclaim: return LNot;
}
}
OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
switch (Opc) {
case PostInc: case PreInc: return OO_PlusPlus;
case PostDec: case PreDec: return OO_MinusMinus;
case AddrOf: return OO_Amp;
case Deref: return OO_Star;
case Plus: return OO_Plus;
case Minus: return OO_Minus;
case Not: return OO_Tilde;
case LNot: return OO_Exclaim;
default: return OO_None;
}
}
//===----------------------------------------------------------------------===//
// Postfix Operators.
//===----------------------------------------------------------------------===//
CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args,
Overhaul of Stmt allocation: - Made allocation of Stmt objects using vanilla new/delete a *compiler error* by making this new/delete "protected" within class Stmt. - Now the only way to allocate Stmt objects is by using the new operator that takes ASTContext& as an argument. This ensures that all Stmt nodes are allocated from the same (pool) allocator. - Naturally, these two changes required that *all* creation sites for AST nodes use new (ASTContext&). This is a large patch, but the majority of the changes are just this mechanical adjustment. - The above changes also mean that AST nodes can no longer be deallocated using 'delete'. Instead, one most do StmtObject->Destroy(ASTContext&) or do ASTContextObject.Deallocate(StmtObject) (the latter not running the 'Destroy' method). Along the way I also... - Made CompoundStmt allocate its array of Stmt* using the allocator in ASTContext (previously it used std::vector). There are a whole bunch of other Stmt classes that need to be similarly changed to ensure that all memory allocated for ASTs comes from the allocator in ASTContext. - Added a new smart pointer ExprOwningPtr to Sema.h. This replaces the uses of llvm::OwningPtr within Sema, as llvm::OwningPtr used 'delete' to free memory instead of a Stmt's 'Destroy' method. Big thanks to Doug Gregor for helping with the acrobatics of making 'new/delete' private and the new smart pointer ExprOwningPtr! git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63997 91177308-0d34-0410-b5e6-96231b3b80d8
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unsigned numargs, QualType t, SourceLocation rparenloc)
: Expr(SC, t,
fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
NumArgs(numargs) {
SubExprs = new (C) Stmt*[numargs+1];
SubExprs[FN] = fn;
for (unsigned i = 0; i != numargs; ++i)
SubExprs[i+ARGS_START] = args[i];
RParenLoc = rparenloc;
}
CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs,
QualType t, SourceLocation rparenloc)
: Expr(CallExprClass, t,
fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
NumArgs(numargs) {
SubExprs = new (C) Stmt*[numargs+1];
SubExprs[FN] = fn;
for (unsigned i = 0; i != numargs; ++i)
SubExprs[i+ARGS_START] = args[i];
RParenLoc = rparenloc;
}
CallExpr::CallExpr(ASTContext &C, EmptyShell Empty)
: Expr(CallExprClass, Empty), SubExprs(0), NumArgs(0) {
SubExprs = new (C) Stmt*[1];
}
void CallExpr::Destroy(ASTContext& C) {
DestroyChildren(C);
if (SubExprs) C.Deallocate(SubExprs);
this->~CallExpr();
C.Deallocate(this);
}
/// setNumArgs - This changes the number of arguments present in this call.
/// Any orphaned expressions are deleted by this, and any new operands are set
/// to null.
Overhaul of Stmt allocation: - Made allocation of Stmt objects using vanilla new/delete a *compiler error* by making this new/delete "protected" within class Stmt. - Now the only way to allocate Stmt objects is by using the new operator that takes ASTContext& as an argument. This ensures that all Stmt nodes are allocated from the same (pool) allocator. - Naturally, these two changes required that *all* creation sites for AST nodes use new (ASTContext&). This is a large patch, but the majority of the changes are just this mechanical adjustment. - The above changes also mean that AST nodes can no longer be deallocated using 'delete'. Instead, one most do StmtObject->Destroy(ASTContext&) or do ASTContextObject.Deallocate(StmtObject) (the latter not running the 'Destroy' method). Along the way I also... - Made CompoundStmt allocate its array of Stmt* using the allocator in ASTContext (previously it used std::vector). There are a whole bunch of other Stmt classes that need to be similarly changed to ensure that all memory allocated for ASTs comes from the allocator in ASTContext. - Added a new smart pointer ExprOwningPtr to Sema.h. This replaces the uses of llvm::OwningPtr within Sema, as llvm::OwningPtr used 'delete' to free memory instead of a Stmt's 'Destroy' method. Big thanks to Doug Gregor for helping with the acrobatics of making 'new/delete' private and the new smart pointer ExprOwningPtr! git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63997 91177308-0d34-0410-b5e6-96231b3b80d8
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void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) {
// No change, just return.
if (NumArgs == getNumArgs()) return;
// If shrinking # arguments, just delete the extras and forgot them.
if (NumArgs < getNumArgs()) {
for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i)
Overhaul of Stmt allocation: - Made allocation of Stmt objects using vanilla new/delete a *compiler error* by making this new/delete "protected" within class Stmt. - Now the only way to allocate Stmt objects is by using the new operator that takes ASTContext& as an argument. This ensures that all Stmt nodes are allocated from the same (pool) allocator. - Naturally, these two changes required that *all* creation sites for AST nodes use new (ASTContext&). This is a large patch, but the majority of the changes are just this mechanical adjustment. - The above changes also mean that AST nodes can no longer be deallocated using 'delete'. Instead, one most do StmtObject->Destroy(ASTContext&) or do ASTContextObject.Deallocate(StmtObject) (the latter not running the 'Destroy' method). Along the way I also... - Made CompoundStmt allocate its array of Stmt* using the allocator in ASTContext (previously it used std::vector). There are a whole bunch of other Stmt classes that need to be similarly changed to ensure that all memory allocated for ASTs comes from the allocator in ASTContext. - Added a new smart pointer ExprOwningPtr to Sema.h. This replaces the uses of llvm::OwningPtr within Sema, as llvm::OwningPtr used 'delete' to free memory instead of a Stmt's 'Destroy' method. Big thanks to Doug Gregor for helping with the acrobatics of making 'new/delete' private and the new smart pointer ExprOwningPtr! git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63997 91177308-0d34-0410-b5e6-96231b3b80d8
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getArg(i)->Destroy(C);
this->NumArgs = NumArgs;
return;
}
// Otherwise, we are growing the # arguments. New an bigger argument array.
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
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Stmt **NewSubExprs = new Stmt*[NumArgs+1];
// Copy over args.
for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i)
NewSubExprs[i] = SubExprs[i];
// Null out new args.
for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i)
NewSubExprs[i] = 0;
if (SubExprs) C.Deallocate(SubExprs);
SubExprs = NewSubExprs;
this->NumArgs = NumArgs;
}
/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
/// not, return 0.
unsigned CallExpr::isBuiltinCall(ASTContext &Context) const {
// All simple function calls (e.g. func()) are implicitly cast to pointer to
// function. As a result, we try and obtain the DeclRefExpr from the
// ImplicitCastExpr.
const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
return 0;
const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
if (!DRE)
return 0;
const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
if (!FDecl)
return 0;
if (!FDecl->getIdentifier())
return 0;
return FDecl->getBuiltinID(Context);
}
QualType CallExpr::getCallReturnType() const {
QualType CalleeType = getCallee()->getType();
if (const PointerType *FnTypePtr = CalleeType->getAsPointerType())
CalleeType = FnTypePtr->getPointeeType();
else if (const BlockPointerType *BPT = CalleeType->getAsBlockPointerType())
CalleeType = BPT->getPointeeType();
const FunctionType *FnType = CalleeType->getAsFunctionType();
return FnType->getResultType();
}
/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
/// corresponds to, e.g. "<<=".
const char *BinaryOperator::getOpcodeStr(Opcode Op) {
switch (Op) {
case PtrMemD: return ".*";
case PtrMemI: return "->*";
case Mul: return "*";
case Div: return "/";
case Rem: return "%";
case Add: return "+";
case Sub: return "-";
case Shl: return "<<";
case Shr: return ">>";
case LT: return "<";
case GT: return ">";
case LE: return "<=";
case GE: return ">=";
case EQ: return "==";
case NE: return "!=";
case And: return "&";
case Xor: return "^";
case Or: return "|";
case LAnd: return "&&";
case LOr: return "||";
case Assign: return "=";
case MulAssign: return "*=";
case DivAssign: return "/=";
case RemAssign: return "%=";
case AddAssign: return "+=";
case SubAssign: return "-=";
case ShlAssign: return "<<=";
case ShrAssign: return ">>=";
case AndAssign: return "&=";
case XorAssign: return "^=";
case OrAssign: return "|=";
case Comma: return ",";
}
return "";
}
BinaryOperator::Opcode
BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
switch (OO) {
default: assert(false && "Not an overloadable binary operator");
case OO_Plus: return Add;
case OO_Minus: return Sub;
case OO_Star: return Mul;
case OO_Slash: return Div;
case OO_Percent: return Rem;
case OO_Caret: return Xor;
case OO_Amp: return And;
case OO_Pipe: return Or;
case OO_Equal: return Assign;
case OO_Less: return LT;
case OO_Greater: return GT;
case OO_PlusEqual: return AddAssign;
case OO_MinusEqual: return SubAssign;
case OO_StarEqual: return MulAssign;
case OO_SlashEqual: return DivAssign;
case OO_PercentEqual: return RemAssign;
case OO_CaretEqual: return XorAssign;
case OO_AmpEqual: return AndAssign;
case OO_PipeEqual: return OrAssign;
case OO_LessLess: return Shl;
case OO_GreaterGreater: return Shr;
case OO_LessLessEqual: return ShlAssign;
case OO_GreaterGreaterEqual: return ShrAssign;
case OO_EqualEqual: return EQ;
case OO_ExclaimEqual: return NE;
case OO_LessEqual: return LE;
case OO_GreaterEqual: return GE;
case OO_AmpAmp: return LAnd;
case OO_PipePipe: return LOr;
case OO_Comma: return Comma;
case OO_ArrowStar: return PtrMemI;
}
}
OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
static const OverloadedOperatorKind OverOps[] = {
/* .* Cannot be overloaded */OO_None, OO_ArrowStar,
OO_Star, OO_Slash, OO_Percent,
OO_Plus, OO_Minus,
OO_LessLess, OO_GreaterGreater,
OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
OO_EqualEqual, OO_ExclaimEqual,
OO_Amp,
OO_Caret,
OO_Pipe,
OO_AmpAmp,
OO_PipePipe,
OO_Equal, OO_StarEqual,
OO_SlashEqual, OO_PercentEqual,
OO_PlusEqual, OO_MinusEqual,
OO_LessLessEqual, OO_GreaterGreaterEqual,
OO_AmpEqual, OO_CaretEqual,
OO_PipeEqual,
OO_Comma
};
return OverOps[Opc];
}
InitListExpr::InitListExpr(SourceLocation lbraceloc,
Expr **initExprs, unsigned numInits,
SourceLocation rbraceloc)
: Expr(InitListExprClass, QualType(),
hasAnyTypeDependentArguments(initExprs, numInits),
hasAnyValueDependentArguments(initExprs, numInits)),
LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0),
UnionFieldInit(0), HadArrayRangeDesignator(false) {
InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits);
}
void InitListExpr::reserveInits(unsigned NumInits) {
if (NumInits > InitExprs.size())
InitExprs.reserve(NumInits);
}
void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) {
for (unsigned Idx = NumInits, LastIdx = InitExprs.size();
Idx < LastIdx; ++Idx)
InitExprs[Idx]->Destroy(Context);
InitExprs.resize(NumInits, 0);
}
Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) {
if (Init >= InitExprs.size()) {
InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0);
InitExprs.back() = expr;
return 0;
}
Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
InitExprs[Init] = expr;
return Result;
}
/// getFunctionType - Return the underlying function type for this block.
///
const FunctionType *BlockExpr::getFunctionType() const {
return getType()->getAsBlockPointerType()->
getPointeeType()->getAsFunctionType();
}
SourceLocation BlockExpr::getCaretLocation() const {
return TheBlock->getCaretLocation();
}
const Stmt *BlockExpr::getBody() const {
return TheBlock->getBody();
}
Stmt *BlockExpr::getBody() {
return TheBlock->getBody();
}
//===----------------------------------------------------------------------===//
// Generic Expression Routines
//===----------------------------------------------------------------------===//
/// isUnusedResultAWarning - Return true if this immediate expression should
/// be warned about if the result is unused. If so, fill in Loc and Ranges
/// with location to warn on and the source range[s] to report with the
/// warning.
bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
SourceRange &R2) const {
// Don't warn if the expr is type dependent. The type could end up
// instantiating to void.
if (isTypeDependent())
return false;
switch (getStmtClass()) {
default:
Loc = getExprLoc();
R1 = getSourceRange();
return true;
case ParenExprClass:
return cast<ParenExpr>(this)->getSubExpr()->
isUnusedResultAWarning(Loc, R1, R2);
case UnaryOperatorClass: {
const UnaryOperator *UO = cast<UnaryOperator>(this);
switch (UO->getOpcode()) {
default: break;
case UnaryOperator::PostInc:
case UnaryOperator::PostDec:
case UnaryOperator::PreInc:
case UnaryOperator::PreDec: // ++/--
return false; // Not a warning.
case UnaryOperator::Deref:
// Dereferencing a volatile pointer is a side-effect.
if (getType().isVolatileQualified())
return false;
break;
case UnaryOperator::Real:
case UnaryOperator::Imag:
// accessing a piece of a volatile complex is a side-effect.
if (UO->getSubExpr()->getType().isVolatileQualified())
return false;
break;
case UnaryOperator::Extension:
return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
}
Loc = UO->getOperatorLoc();
R1 = UO->getSubExpr()->getSourceRange();
return true;
}
case BinaryOperatorClass: {
const BinaryOperator *BO = cast<BinaryOperator>(this);
// Consider comma to have side effects if the LHS or RHS does.
if (BO->getOpcode() == BinaryOperator::Comma)
return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2) ||
BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2);
if (BO->isAssignmentOp())
return false;
Loc = BO->getOperatorLoc();
R1 = BO->getLHS()->getSourceRange();
R2 = BO->getRHS()->getSourceRange();
return true;
}
case CompoundAssignOperatorClass:
return false;
case ConditionalOperatorClass: {
// The condition must be evaluated, but if either the LHS or RHS is a
// warning, warn about them.
const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
if (Exp->getLHS() &&
Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2))
return true;
return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2);
}
case MemberExprClass:
// If the base pointer or element is to a volatile pointer/field, accessing
// it is a side effect.
if (getType().isVolatileQualified())
return false;
Loc = cast<MemberExpr>(this)->getMemberLoc();
R1 = SourceRange(Loc, Loc);
R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
return true;
case ArraySubscriptExprClass:
// If the base pointer or element is to a volatile pointer/field, accessing
// it is a side effect.
if (getType().isVolatileQualified())
return false;
Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
return true;
case CallExprClass:
case CXXOperatorCallExprClass:
case CXXMemberCallExprClass: {
// If this is a direct call, get the callee.
const CallExpr *CE = cast<CallExpr>(this);
const Expr *CalleeExpr = CE->getCallee()->IgnoreParenCasts();
if (const DeclRefExpr *CalleeDRE = dyn_cast<DeclRefExpr>(CalleeExpr)) {
// If the callee has attribute pure, const, or warn_unused_result, warn
// about it. void foo() { strlen("bar"); } should warn.
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CalleeDRE->getDecl()))
if (FD->getAttr<WarnUnusedResultAttr>() ||
FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) {
Loc = CE->getCallee()->getLocStart();
R1 = CE->getCallee()->getSourceRange();
if (unsigned NumArgs = CE->getNumArgs())
R2 = SourceRange(CE->getArg(0)->getLocStart(),
CE->getArg(NumArgs-1)->getLocEnd());
return true;
}
}
return false;
}
case ObjCMessageExprClass:
return false;
case StmtExprClass: {
// Statement exprs don't logically have side effects themselves, but are
// sometimes used in macros in ways that give them a type that is unused.
// For example ({ blah; foo(); }) will end up with a type if foo has a type.
// however, if the result of the stmt expr is dead, we don't want to emit a
// warning.
const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
if (!CS->body_empty())
if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
return E->isUnusedResultAWarning(Loc, R1, R2);
Loc = cast<StmtExpr>(this)->getLParenLoc();
R1 = getSourceRange();
return true;
}
case CStyleCastExprClass:
// If this is a cast to void, check the operand. Otherwise, the result of
// the cast is unused.
if (getType()->isVoidType())
return cast<CastExpr>(this)->getSubExpr()
->isUnusedResultAWarning(Loc, R1, R2);
Loc = cast<CStyleCastExpr>(this)->getLParenLoc();
R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange();
return true;
case CXXFunctionalCastExprClass:
// If this is a cast to void, check the operand. Otherwise, the result of
// the cast is unused.
if (getType()->isVoidType())
return cast<CastExpr>(this)->getSubExpr()
->isUnusedResultAWarning(Loc, R1, R2);
Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc();
R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange();
return true;
case ImplicitCastExprClass:
// Check the operand, since implicit casts are inserted by Sema
return cast<ImplicitCastExpr>(this)
->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
case CXXDefaultArgExprClass:
return cast<CXXDefaultArgExpr>(this)
->getExpr()->isUnusedResultAWarning(Loc, R1, R2);
case CXXNewExprClass:
// FIXME: In theory, there might be new expressions that don't have side
// effects (e.g. a placement new with an uninitialized POD).
case CXXDeleteExprClass:
return false;
case CXXExprWithTemporariesClass:
return cast<CXXExprWithTemporaries>(this)
->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
}
}
/// DeclCanBeLvalue - Determine whether the given declaration can be
/// an lvalue. This is a helper routine for isLvalue.
static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) {
// C++ [temp.param]p6:
// A non-type non-reference template-parameter is not an lvalue.
if (const NonTypeTemplateParmDecl *NTTParm
= dyn_cast<NonTypeTemplateParmDecl>(Decl))
return NTTParm->getType()->isReferenceType();
return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) ||
// C++ 3.10p2: An lvalue refers to an object or function.
(Ctx.getLangOptions().CPlusPlus &&
(isa<FunctionDecl>(Decl) || isa<OverloadedFunctionDecl>(Decl) ||
isa<FunctionTemplateDecl>(Decl)));
}
/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an
/// incomplete type other than void. Nonarray expressions that can be lvalues:
/// - name, where name must be a variable
/// - e[i]
/// - (e), where e must be an lvalue
/// - e.name, where e must be an lvalue
/// - e->name
/// - *e, the type of e cannot be a function type
/// - string-constant
/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension]
/// - reference type [C++ [expr]]
///
Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const {
assert(!TR->isReferenceType() && "Expressions can't have reference type.");
isLvalueResult Res = isLvalueInternal(Ctx);
if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus)
return Res;
// first, check the type (C99 6.3.2.1). Expressions with function
// type in C are not lvalues, but they can be lvalues in C++.
if (TR->isFunctionType() || TR == Ctx.OverloadTy)
return LV_NotObjectType;
// Allow qualified void which is an incomplete type other than void (yuck).
if (TR->isVoidType() && !Ctx.getCanonicalType(TR).getCVRQualifiers())
return LV_IncompleteVoidType;
return LV_Valid;
}
// Check whether the expression can be sanely treated like an l-value
Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const {
switch (getStmtClass()) {
case StringLiteralClass: // C99 6.5.1p4
case ObjCEncodeExprClass: // @encode behaves like its string in every way.
return LV_Valid;
case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2))))
// For vectors, make sure base is an lvalue (i.e. not a function call).
if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType())
return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx);
return LV_Valid;
case DeclRefExprClass:
case QualifiedDeclRefExprClass: { // C99 6.5.1p2
const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl();
if (DeclCanBeLvalue(RefdDecl, Ctx))
return LV_Valid;
break;
}
case BlockDeclRefExprClass: {
const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this);
if (isa<VarDecl>(BDR->getDecl()))
return LV_Valid;
break;
}
case MemberExprClass: {
const MemberExpr *m = cast<MemberExpr>(this);
if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4:
NamedDecl *Member = m->getMemberDecl();
// C++ [expr.ref]p4:
// If E2 is declared to have type "reference to T", then E1.E2
// is an lvalue.
if (ValueDecl *Value = dyn_cast<ValueDecl>(Member))
if (Value->getType()->isReferenceType())
return LV_Valid;
// -- If E2 is a static data member [...] then E1.E2 is an lvalue.
if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord())
return LV_Valid;
// -- If E2 is a non-static data member [...]. If E1 is an
// lvalue, then E1.E2 is an lvalue.
if (isa<FieldDecl>(Member))
return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx);
// -- If it refers to a static member function [...], then
// E1.E2 is an lvalue.
// -- Otherwise, if E1.E2 refers to a non-static member
// function [...], then E1.E2 is not an lvalue.
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member))
return Method->isStatic()? LV_Valid : LV_MemberFunction;
// -- If E2 is a member enumerator [...], the expression E1.E2
// is not an lvalue.
if (isa<EnumConstantDecl>(Member))
return LV_InvalidExpression;
// Not an lvalue.
return LV_InvalidExpression;
}
// C99 6.5.2.3p4
return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx);
}
case UnaryOperatorClass:
if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref)
return LV_Valid; // C99 6.5.3p4
if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real ||
cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag ||
cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension)
return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU.
if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1
(cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc ||
cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec))
return LV_Valid;
break;
case ImplicitCastExprClass:
return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid
: LV_InvalidExpression;
case ParenExprClass: // C99 6.5.1p5
return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx);
case BinaryOperatorClass:
case CompoundAssignOperatorClass: {
const BinaryOperator *BinOp = cast<BinaryOperator>(this);
if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1
BinOp->getOpcode() == BinaryOperator::Comma)
return BinOp->getRHS()->isLvalue(Ctx);
// C++ [expr.mptr.oper]p6
if ((BinOp->getOpcode() == BinaryOperator::PtrMemD ||
BinOp->getOpcode() == BinaryOperator::PtrMemI) &&
!BinOp->getType()->isFunctionType())
return BinOp->getLHS()->isLvalue(Ctx);
if (!BinOp->isAssignmentOp())
return LV_InvalidExpression;
if (Ctx.getLangOptions().CPlusPlus)
// C++ [expr.ass]p1:
// The result of an assignment operation [...] is an lvalue.
return LV_Valid;
// C99 6.5.16:
// An assignment expression [...] is not an lvalue.
return LV_InvalidExpression;
}
case CallExprClass:
case CXXOperatorCallExprClass:
case CXXMemberCallExprClass: {
// C++0x [expr.call]p10
// A function call is an lvalue if and only if the result type
// is an lvalue reference.
QualType ReturnType = cast<CallExpr>(this)->getCallReturnType();
if (ReturnType->isLValueReferenceType())
return LV_Valid;
break;
}
case CompoundLiteralExprClass: // C99 6.5.2.5p5
return LV_Valid;
case ChooseExprClass:
// __builtin_choose_expr is an lvalue if the selected operand is.
return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx);
case ExtVectorElementExprClass:
if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements())
return LV_DuplicateVectorComponents;
return LV_Valid;
case ObjCIvarRefExprClass: // ObjC instance variables are lvalues.
return LV_Valid;
case ObjCPropertyRefExprClass: // FIXME: check if read-only property.
return LV_Valid;
case ObjCKVCRefExprClass: // FIXME: check if read-only property.
return LV_Valid;
case PredefinedExprClass:
return LV_Valid;
case CXXDefaultArgExprClass:
return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx);
case CXXConditionDeclExprClass:
return LV_Valid;
case CStyleCastExprClass:
case CXXFunctionalCastExprClass:
case CXXStaticCastExprClass:
case CXXDynamicCastExprClass:
case CXXReinterpretCastExprClass:
case CXXConstCastExprClass:
// The result of an explicit cast is an lvalue if the type we are
// casting to is an lvalue reference type. See C++ [expr.cast]p1,
// C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2,
// C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1.
if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()->
isLValueReferenceType())
return LV_Valid;
break;
case CXXTypeidExprClass:
// C++ 5.2.8p1: The result of a typeid expression is an lvalue of ...
return LV_Valid;
case ConditionalOperatorClass: {
// Complicated handling is only for C++.
if (!Ctx.getLangOptions().CPlusPlus)
return LV_InvalidExpression;
// Sema should have taken care to ensure that a CXXTemporaryObjectExpr is
// everywhere there's an object converted to an rvalue. Also, any other
// casts should be wrapped by ImplicitCastExprs. There's just the special
// case involving throws to work out.
const ConditionalOperator *Cond = cast<ConditionalOperator>(this);
Expr *True = Cond->getTrueExpr();
Expr *False = Cond->getFalseExpr();
// C++0x 5.16p2
// If either the second or the third operand has type (cv) void, [...]
// the result [...] is an rvalue.
if (True->getType()->isVoidType() || False->getType()->isVoidType())
return LV_InvalidExpression;
// Both sides must be lvalues for the result to be an lvalue.
if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid)
return LV_InvalidExpression;
// That's it.
return LV_Valid;
}
default:
break;
}
return LV_InvalidExpression;
}
/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
/// does not have an incomplete type, does not have a const-qualified type, and
/// if it is a structure or union, does not have any member (including,
/// recursively, any member or element of all contained aggregates or unions)
/// with a const-qualified type.
Expr::isModifiableLvalueResult
Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const {
isLvalueResult lvalResult = isLvalue(Ctx);
switch (lvalResult) {
case LV_Valid:
// C++ 3.10p11: Functions cannot be modified, but pointers to
// functions can be modifiable.
if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType())
return MLV_NotObjectType;
break;
case LV_NotObjectType: return MLV_NotObjectType;
case LV_IncompleteVoidType: return MLV_IncompleteVoidType;
case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents;
case LV_InvalidExpression:
// If the top level is a C-style cast, and the subexpression is a valid
// lvalue, then this is probably a use of the old-school "cast as lvalue"
// GCC extension. We don't support it, but we want to produce good
// diagnostics when it happens so that the user knows why.
if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) {
if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) {
if (Loc)
*Loc = CE->getLParenLoc();
return MLV_LValueCast;
}
}
return MLV_InvalidExpression;
case LV_MemberFunction: return MLV_MemberFunction;
}
// The following is illegal:
// void takeclosure(void (^C)(void));
// void func() { int x = 1; takeclosure(^{ x = 7; }); }
//
if (isa<BlockDeclRefExpr>(this)) {
const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this);
if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl()))
return MLV_NotBlockQualified;
}
QualType CT = Ctx.getCanonicalType(getType());
if (CT.isConstQualified())
return MLV_ConstQualified;
if (CT->isArrayType())
return MLV_ArrayType;
if (CT->isIncompleteType())
return MLV_IncompleteType;
if (const RecordType *r = CT->getAsRecordType()) {
if (r->hasConstFields())
return MLV_ConstQualified;
}
// Assigning to an 'implicit' property?
else if (isa<ObjCKVCRefExpr>(this)) {
const ObjCKVCRefExpr* KVCExpr = cast<ObjCKVCRefExpr>(this);
if (KVCExpr->getSetterMethod() == 0)
return MLV_NoSetterProperty;
}
return MLV_Valid;
}
/// hasGlobalStorage - Return true if this expression has static storage
/// duration. This means that the address of this expression is a link-time
/// constant.
bool Expr::hasGlobalStorage() const {
switch (getStmtClass()) {
default:
return false;
case BlockExprClass:
return true;
case ParenExprClass:
return cast<ParenExpr>(this)->getSubExpr()->hasGlobalStorage();
case ImplicitCastExprClass:
return cast<ImplicitCastExpr>(this)->getSubExpr()->hasGlobalStorage();
case CompoundLiteralExprClass:
return cast<CompoundLiteralExpr>(this)->isFileScope();
case DeclRefExprClass:
case QualifiedDeclRefExprClass: {
const Decl *D = cast<DeclRefExpr>(this)->getDecl();
if (const VarDecl *VD = dyn_cast<VarDecl>(D))
return VD->hasGlobalStorage();
if (isa<FunctionDecl>(D))
return true;
return false;
}
case MemberExprClass: {
const MemberExpr *M = cast<MemberExpr>(this);
return !M->isArrow() && M->getBase()->hasGlobalStorage();
}
case ArraySubscriptExprClass:
return cast<ArraySubscriptExpr>(this)->getBase()->hasGlobalStorage();
case PredefinedExprClass:
return true;
case CXXDefaultArgExprClass:
return cast<CXXDefaultArgExpr>(this)->getExpr()->hasGlobalStorage();
}
}
/// isOBJCGCCandidate - Check if an expression is objc gc'able.
///
bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
switch (getStmtClass()) {
default:
return false;
case ObjCIvarRefExprClass:
return true;
case Expr::UnaryOperatorClass:
return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
case ParenExprClass:
return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
case ImplicitCastExprClass:
return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
case CStyleCastExprClass:
return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
case DeclRefExprClass:
case QualifiedDeclRefExprClass: {
const Decl *D = cast<DeclRefExpr>(this)->getDecl();
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
if (VD->hasGlobalStorage())
return true;
QualType T = VD->getType();
// dereferencing to an object pointer is always a gc'able candidate
if (T->isPointerType() &&
Ctx.isObjCObjectPointerType(T->getAsPointerType()->getPointeeType()))
return true;
}
return false;
}
case MemberExprClass: {
const MemberExpr *M = cast<MemberExpr>(this);
return M->getBase()->isOBJCGCCandidate(Ctx);
}
case ArraySubscriptExprClass:
return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx);
}
}
Expr* Expr::IgnoreParens() {
Expr* E = this;
while (ParenExpr* P = dyn_cast<ParenExpr>(E))
E = P->getSubExpr();
return E;
}
/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
/// or CastExprs or ImplicitCastExprs, returning their operand.
Expr *Expr::IgnoreParenCasts() {
Expr *E = this;
while (true) {
if (ParenExpr *P = dyn_cast<ParenExpr>(E))
E = P->getSubExpr();
else if (CastExpr *P = dyn_cast<CastExpr>(E))
E = P->getSubExpr();
else
return E;
}
}
/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
/// value (including ptr->int casts of the same size). Strip off any
/// ParenExpr or CastExprs, returning their operand.
Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
Expr *E = this;
while (true) {
if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
E = P->getSubExpr();
continue;
}
if (CastExpr *P = dyn_cast<CastExpr>(E)) {
// We ignore integer <-> casts that are of the same width, ptr<->ptr and
// ptr<->int casts of the same width. We also ignore all identify casts.
Expr *SE = P->getSubExpr();
if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) {
E = SE;
continue;
}
if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) &&
(SE->getType()->isPointerType() || SE->getType()->isIntegralType()) &&
Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) {
E = SE;
continue;
}
}
return E;
}
}
/// hasAnyTypeDependentArguments - Determines if any of the expressions
/// in Exprs is type-dependent.
bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) {
for (unsigned I = 0; I < NumExprs; ++I)
if (Exprs[I]->isTypeDependent())
return true;
return false;
}
/// hasAnyValueDependentArguments - Determines if any of the expressions
/// in Exprs is value-dependent.
bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) {
for (unsigned I = 0; I < NumExprs; ++I)
if (Exprs[I]->isValueDependent())
return true;
return false;
}
bool Expr::isConstantInitializer(ASTContext &Ctx) const {
// This function is attempting whether an expression is an initializer
// which can be evaluated at compile-time. isEvaluatable handles most
// of the cases, but it can't deal with some initializer-specific
// expressions, and it can't deal with aggregates; we deal with those here,
// and fall back to isEvaluatable for the other cases.
// FIXME: This function assumes the variable being assigned to
// isn't a reference type!
switch (getStmtClass()) {
default: break;
case StringLiteralClass:
This patch includes a conceptually simple, but very intrusive/pervasive change. The idea is to segregate Objective-C "object" pointers from general C pointers (utilizing the recently added ObjCObjectPointerType). The fun starts in Sema::GetTypeForDeclarator(), where "SomeInterface *" is now represented by a single AST node (rather than a PointerType whose Pointee is an ObjCInterfaceType). Since a significant amount of code assumed ObjC object pointers where based on C pointers/structs, this patch is very tedious. It should also explain why it is hard to accomplish this in smaller, self-contained patches. This patch does most of the "heavy lifting" related to moving from PointerType->ObjCObjectPointerType. It doesn't include all potential "cleanups". The good news is additional cleanups can be done later (some are noted in the code). This patch is so large that I didn't want to include any changes that are purely aesthetic. By making the ObjC types truly built-in, they are much easier to work with (and require fewer "hacks"). For example, there is no need for ASTContext::isObjCIdStructType() or ASTContext::isObjCClassStructType()! We believe this change (and the follow-up cleanups) will pay dividends over time. Given the amount of code change, I do expect some fallout from this change (though it does pass all of the clang tests). If you notice any problems, please let us know asap! Thanks. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@75314 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-11 03:34:53 +04:00
case ObjCStringLiteralClass:
case ObjCEncodeExprClass:
return true;
case CompoundLiteralExprClass: {
// This handles gcc's extension that allows global initializers like
// "struct x {int x;} x = (struct x) {};".
// FIXME: This accepts other cases it shouldn't!
const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
return Exp->isConstantInitializer(Ctx);
}
case InitListExprClass: {
// FIXME: This doesn't deal with fields with reference types correctly.
// FIXME: This incorrectly allows pointers cast to integers to be assigned
// to bitfields.
const InitListExpr *Exp = cast<InitListExpr>(this);
unsigned numInits = Exp->getNumInits();
for (unsigned i = 0; i < numInits; i++) {
if (!Exp->getInit(i)->isConstantInitializer(Ctx))
return false;
}
return true;
}
case ImplicitValueInitExprClass:
return true;
case ParenExprClass: {
return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
}
case UnaryOperatorClass: {
const UnaryOperator* Exp = cast<UnaryOperator>(this);
if (Exp->getOpcode() == UnaryOperator::Extension)
return Exp->getSubExpr()->isConstantInitializer(Ctx);
break;
}
case ImplicitCastExprClass:
case CStyleCastExprClass:
// Handle casts with a destination that's a struct or union; this
// deals with both the gcc no-op struct cast extension and the
// cast-to-union extension.
if (getType()->isRecordType())
return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
break;
}
return isEvaluatable(Ctx);
}
/// isIntegerConstantExpr - this recursive routine will test if an expression is
/// an integer constant expression.
/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero,
/// comma, etc
///
/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof
/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer
/// cast+dereference.
// CheckICE - This function does the fundamental ICE checking: the returned
// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation.
// Note that to reduce code duplication, this helper does no evaluation
// itself; the caller checks whether the expression is evaluatable, and
// in the rare cases where CheckICE actually cares about the evaluated
// value, it calls into Evalute.
//
// Meanings of Val:
// 0: This expression is an ICE if it can be evaluated by Evaluate.
// 1: This expression is not an ICE, but if it isn't evaluated, it's
// a legal subexpression for an ICE. This return value is used to handle
// the comma operator in C99 mode.
// 2: This expression is not an ICE, and is not a legal subexpression for one.
struct ICEDiag {
unsigned Val;
SourceLocation Loc;
public:
ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {}
ICEDiag() : Val(0) {}
};
ICEDiag NoDiag() { return ICEDiag(); }
static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) {
Expr::EvalResult EVResult;
if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
!EVResult.Val.isInt()) {
return ICEDiag(2, E->getLocStart());
}
return NoDiag();
}
static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
assert(!E->isValueDependent() && "Should not see value dependent exprs!");
if (!E->getType()->isIntegralType()) {
return ICEDiag(2, E->getLocStart());
}
switch (E->getStmtClass()) {
default:
return ICEDiag(2, E->getLocStart());
case Expr::ParenExprClass:
return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx);
case Expr::IntegerLiteralClass:
case Expr::CharacterLiteralClass:
case Expr::CXXBoolLiteralExprClass:
case Expr::CXXZeroInitValueExprClass:
case Expr::TypesCompatibleExprClass:
case Expr::UnaryTypeTraitExprClass:
return NoDiag();
case Expr::CallExprClass:
case Expr::CXXOperatorCallExprClass: {
const CallExpr *CE = cast<CallExpr>(E);
if (CE->isBuiltinCall(Ctx))
return CheckEvalInICE(E, Ctx);
return ICEDiag(2, E->getLocStart());
}
case Expr::DeclRefExprClass:
case Expr::QualifiedDeclRefExprClass:
if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl()))
return NoDiag();
if (Ctx.getLangOptions().CPlusPlus &&
E->getType().getCVRQualifiers() == QualType::Const) {
// C++ 7.1.5.1p2
// A variable of non-volatile const-qualified integral or enumeration
// type initialized by an ICE can be used in ICEs.
if (const VarDecl *Dcl =
dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) {
if (Dcl->isInitKnownICE()) {
// We have already checked whether this subexpression is an
// integral constant expression.
if (Dcl->isInitICE())
return NoDiag();
else
return ICEDiag(2, E->getLocStart());
}
if (const Expr *Init = Dcl->getInit()) {
ICEDiag Result = CheckICE(Init, Ctx);
// Cache the result of the ICE test.
Dcl->setInitKnownICE(Ctx, Result.Val == 0);
return Result;
}
}
}
return ICEDiag(2, E->getLocStart());
case Expr::UnaryOperatorClass: {
const UnaryOperator *Exp = cast<UnaryOperator>(E);
switch (Exp->getOpcode()) {
default:
return ICEDiag(2, E->getLocStart());
case UnaryOperator::Extension:
case UnaryOperator::LNot:
case UnaryOperator::Plus:
case UnaryOperator::Minus:
case UnaryOperator::Not:
case UnaryOperator::Real:
case UnaryOperator::Imag:
return CheckICE(Exp->getSubExpr(), Ctx);
case UnaryOperator::OffsetOf:
// Note that per C99, offsetof must be an ICE. And AFAIK, using
// Evaluate matches the proposed gcc behavior for cases like
// "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect
// compliance: we should warn earlier for offsetof expressions with
// array subscripts that aren't ICEs, and if the array subscripts
// are ICEs, the value of the offsetof must be an integer constant.
return CheckEvalInICE(E, Ctx);
}
}
case Expr::SizeOfAlignOfExprClass: {
const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E);
if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType())
return ICEDiag(2, E->getLocStart());
return NoDiag();
}
case Expr::BinaryOperatorClass: {
const BinaryOperator *Exp = cast<BinaryOperator>(E);
switch (Exp->getOpcode()) {
default:
return ICEDiag(2, E->getLocStart());
case BinaryOperator::Mul:
case BinaryOperator::Div:
case BinaryOperator::Rem:
case BinaryOperator::Add:
case BinaryOperator::Sub:
case BinaryOperator::Shl:
case BinaryOperator::Shr:
case BinaryOperator::LT:
case BinaryOperator::GT:
case BinaryOperator::LE:
case BinaryOperator::GE:
case BinaryOperator::EQ:
case BinaryOperator::NE:
case BinaryOperator::And:
case BinaryOperator::Xor:
case BinaryOperator::Or:
case BinaryOperator::Comma: {
ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
if (Exp->getOpcode() == BinaryOperator::Div ||
Exp->getOpcode() == BinaryOperator::Rem) {
// Evaluate gives an error for undefined Div/Rem, so make sure
// we don't evaluate one.
if (LHSResult.Val != 2 && RHSResult.Val != 2) {
llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx);
if (REval == 0)
return ICEDiag(1, E->getLocStart());
if (REval.isSigned() && REval.isAllOnesValue()) {
llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx);
if (LEval.isMinSignedValue())
return ICEDiag(1, E->getLocStart());
}
}
}
if (Exp->getOpcode() == BinaryOperator::Comma) {
if (Ctx.getLangOptions().C99) {
// C99 6.6p3 introduces a strange edge case: comma can be in an ICE
// if it isn't evaluated.
if (LHSResult.Val == 0 && RHSResult.Val == 0)
return ICEDiag(1, E->getLocStart());
} else {
// In both C89 and C++, commas in ICEs are illegal.
return ICEDiag(2, E->getLocStart());
}
}
if (LHSResult.Val >= RHSResult.Val)
return LHSResult;
return RHSResult;
}
case BinaryOperator::LAnd:
case BinaryOperator::LOr: {
ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
if (LHSResult.Val == 0 && RHSResult.Val == 1) {
// Rare case where the RHS has a comma "side-effect"; we need
// to actually check the condition to see whether the side
// with the comma is evaluated.
if ((Exp->getOpcode() == BinaryOperator::LAnd) !=
(Exp->getLHS()->EvaluateAsInt(Ctx) == 0))
return RHSResult;
return NoDiag();
}
if (LHSResult.Val >= RHSResult.Val)
return LHSResult;
return RHSResult;
}
}
}
case Expr::ImplicitCastExprClass:
case Expr::CStyleCastExprClass:
case Expr::CXXFunctionalCastExprClass: {
const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr();
if (SubExpr->getType()->isIntegralType())
return CheckICE(SubExpr, Ctx);
if (isa<FloatingLiteral>(SubExpr->IgnoreParens()))
return NoDiag();
return ICEDiag(2, E->getLocStart());
}
case Expr::ConditionalOperatorClass: {
const ConditionalOperator *Exp = cast<ConditionalOperator>(E);
// If the condition (ignoring parens) is a __builtin_constant_p call,
// then only the true side is actually considered in an integer constant
// expression, and it is fully evaluated. This is an important GNU
// extension. See GCC PR38377 for discussion.
if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts()))
if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) {
Expr::EvalResult EVResult;
if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
!EVResult.Val.isInt()) {
return ICEDiag(2, E->getLocStart());
}
return NoDiag();
}
ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx);
ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx);
ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx);
if (CondResult.Val == 2)
return CondResult;
if (TrueResult.Val == 2)
return TrueResult;
if (FalseResult.Val == 2)
return FalseResult;
if (CondResult.Val == 1)
return CondResult;
if (TrueResult.Val == 0 && FalseResult.Val == 0)
return NoDiag();
// Rare case where the diagnostics depend on which side is evaluated
// Note that if we get here, CondResult is 0, and at least one of
// TrueResult and FalseResult is non-zero.
if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) {
return FalseResult;
}
return TrueResult;
}
case Expr::CXXDefaultArgExprClass:
return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx);
case Expr::ChooseExprClass: {
return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx);
}
}
}
bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx,
SourceLocation *Loc, bool isEvaluated) const {
ICEDiag d = CheckICE(this, Ctx);
if (d.Val != 0) {
if (Loc) *Loc = d.Loc;
return false;
}
EvalResult EvalResult;
if (!Evaluate(EvalResult, Ctx))
assert(0 && "ICE cannot be evaluated!");
assert(!EvalResult.HasSideEffects && "ICE with side effects!");
assert(EvalResult.Val.isInt() && "ICE that isn't integer!");
Result = EvalResult.Val.getInt();
return true;
}
/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an
/// integer constant expression with the value zero, or if this is one that is
/// cast to void*.
bool Expr::isNullPointerConstant(ASTContext &Ctx) const
{
// Strip off a cast to void*, if it exists. Except in C++.
if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
if (!Ctx.getLangOptions().CPlusPlus) {
// Check that it is a cast to void*.
if (const PointerType *PT = CE->getType()->getAsPointerType()) {
QualType Pointee = PT->getPointeeType();
if (Pointee.getCVRQualifiers() == 0 &&
Pointee->isVoidType() && // to void*
CE->getSubExpr()->getType()->isIntegerType()) // from int.
return CE->getSubExpr()->isNullPointerConstant(Ctx);
}
}
} else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
// Ignore the ImplicitCastExpr type entirely.
return ICE->getSubExpr()->isNullPointerConstant(Ctx);
} else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
// Accept ((void*)0) as a null pointer constant, as many other
// implementations do.
return PE->getSubExpr()->isNullPointerConstant(Ctx);
} else if (const CXXDefaultArgExpr *DefaultArg
= dyn_cast<CXXDefaultArgExpr>(this)) {
// See through default argument expressions
return DefaultArg->getExpr()->isNullPointerConstant(Ctx);
} else if (isa<GNUNullExpr>(this)) {
// The GNU __null extension is always a null pointer constant.
return true;
}
// C++0x nullptr_t is always a null pointer constant.
if (getType()->isNullPtrType())
return true;
// This expression must be an integer type.
if (!getType()->isIntegerType())
return false;
// If we have an integer constant expression, we need to *evaluate* it and
// test for the value 0.
llvm::APSInt Result;
return isIntegerConstantExpr(Result, Ctx) && Result == 0;
}
FieldDecl *Expr::getBitField() {
Expr *E = this->IgnoreParens();
if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
if (Field->isBitField())
return Field;
if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E))
if (BinOp->isAssignmentOp() && BinOp->getLHS())
return BinOp->getLHS()->getBitField();
return 0;
}
/// isArrow - Return true if the base expression is a pointer to vector,
/// return false if the base expression is a vector.
bool ExtVectorElementExpr::isArrow() const {
return getBase()->getType()->isPointerType();
}
unsigned ExtVectorElementExpr::getNumElements() const {
if (const VectorType *VT = getType()->getAsVectorType())
return VT->getNumElements();
return 1;
}
/// containsDuplicateElements - Return true if any element access is repeated.
bool ExtVectorElementExpr::containsDuplicateElements() const {
const char *compStr = Accessor->getName();
unsigned length = Accessor->getLength();
// Halving swizzles do not contain duplicate elements.
if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
!strcmp(compStr, "even") || !strcmp(compStr, "odd"))
return false;
// Advance past s-char prefix on hex swizzles.
if (*compStr == 's' || *compStr == 'S') {
compStr++;
length--;
}
for (unsigned i = 0; i != length-1; i++) {
const char *s = compStr+i;
for (const char c = *s++; *s; s++)
if (c == *s)
return true;
}
return false;
}
/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
void ExtVectorElementExpr::getEncodedElementAccess(
llvm::SmallVectorImpl<unsigned> &Elts) const {
const char *compStr = Accessor->getName();
if (*compStr == 's' || *compStr == 'S')
compStr++;
bool isHi = !strcmp(compStr, "hi");
bool isLo = !strcmp(compStr, "lo");
bool isEven = !strcmp(compStr, "even");
bool isOdd = !strcmp(compStr, "odd");
for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
uint64_t Index;
if (isHi)
Index = e + i;
else if (isLo)
Index = i;
else if (isEven)
Index = 2 * i;
else if (isOdd)
Index = 2 * i + 1;
else
Index = ExtVectorType::getAccessorIdx(compStr[i]);
Elts.push_back(Index);
}
}
// constructor for instance messages.
ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo,
QualType retType, ObjCMethodDecl *mproto,
SourceLocation LBrac, SourceLocation RBrac,
Expr **ArgExprs, unsigned nargs)
: Expr(ObjCMessageExprClass, retType), SelName(selInfo),
MethodProto(mproto) {
NumArgs = nargs;
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
SubExprs = new Stmt*[NumArgs+1];
SubExprs[RECEIVER] = receiver;
if (NumArgs) {
for (unsigned i = 0; i != NumArgs; ++i)
SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
}
LBracloc = LBrac;
RBracloc = RBrac;
}
ObjCStringLiteral* ObjCStringLiteral::Clone(ASTContext &C) const {
// Clone the string literal.
StringLiteral *NewString =
String ? cast<StringLiteral>(String)->Clone(C) : 0;
return new (C) ObjCStringLiteral(NewString, getType(), AtLoc);
}
ObjCSelectorExpr *ObjCSelectorExpr::Clone(ASTContext &C) const {
return new (C) ObjCSelectorExpr(getType(), SelName, AtLoc, RParenLoc);
}
ObjCProtocolExpr *ObjCProtocolExpr::Clone(ASTContext &C) const {
return new (C) ObjCProtocolExpr(getType(), TheProtocol, AtLoc, RParenLoc);
}
// constructor for class messages.
// FIXME: clsName should be typed to ObjCInterfaceType
ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo,
QualType retType, ObjCMethodDecl *mproto,
SourceLocation LBrac, SourceLocation RBrac,
Expr **ArgExprs, unsigned nargs)
: Expr(ObjCMessageExprClass, retType), SelName(selInfo),
MethodProto(mproto) {
NumArgs = nargs;
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
SubExprs = new Stmt*[NumArgs+1];
SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown);
if (NumArgs) {
for (unsigned i = 0; i != NumArgs; ++i)
SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
}
LBracloc = LBrac;
RBracloc = RBrac;
}
// constructor for class messages.
ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo,
QualType retType, ObjCMethodDecl *mproto,
SourceLocation LBrac, SourceLocation RBrac,
Expr **ArgExprs, unsigned nargs)
: Expr(ObjCMessageExprClass, retType), SelName(selInfo),
MethodProto(mproto) {
NumArgs = nargs;
SubExprs = new Stmt*[NumArgs+1];
SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown);
if (NumArgs) {
for (unsigned i = 0; i != NumArgs; ++i)
SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
}
LBracloc = LBrac;
RBracloc = RBrac;
}
ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const {
uintptr_t x = (uintptr_t) SubExprs[RECEIVER];
switch (x & Flags) {
default:
assert(false && "Invalid ObjCMessageExpr.");
case IsInstMeth:
return ClassInfo(0, 0);
case IsClsMethDeclUnknown:
return ClassInfo(0, (IdentifierInfo*) (x & ~Flags));
case IsClsMethDeclKnown: {
ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags);
return ClassInfo(D, D->getIdentifier());
}
}
}
void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) {
if (CI.first == 0 && CI.second == 0)
SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth);
else if (CI.first == 0)
SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown);
else
SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown);
}
bool ChooseExpr::isConditionTrue(ASTContext &C) const {
return getCond()->EvaluateAsInt(C) != 0;
}
void ShuffleVectorExpr::setExprs(Expr ** Exprs, unsigned NumExprs) {
if (NumExprs)
delete [] SubExprs;
SubExprs = new Stmt* [NumExprs];
this->NumExprs = NumExprs;
memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs);
}
void SizeOfAlignOfExpr::Destroy(ASTContext& C) {
// Override default behavior of traversing children. If this has a type
// operand and the type is a variable-length array, the child iteration
// will iterate over the size expression. However, this expression belongs
// to the type, not to this, so we don't want to delete it.
// We still want to delete this expression.
Overhaul of Stmt allocation: - Made allocation of Stmt objects using vanilla new/delete a *compiler error* by making this new/delete "protected" within class Stmt. - Now the only way to allocate Stmt objects is by using the new operator that takes ASTContext& as an argument. This ensures that all Stmt nodes are allocated from the same (pool) allocator. - Naturally, these two changes required that *all* creation sites for AST nodes use new (ASTContext&). This is a large patch, but the majority of the changes are just this mechanical adjustment. - The above changes also mean that AST nodes can no longer be deallocated using 'delete'. Instead, one most do StmtObject->Destroy(ASTContext&) or do ASTContextObject.Deallocate(StmtObject) (the latter not running the 'Destroy' method). Along the way I also... - Made CompoundStmt allocate its array of Stmt* using the allocator in ASTContext (previously it used std::vector). There are a whole bunch of other Stmt classes that need to be similarly changed to ensure that all memory allocated for ASTs comes from the allocator in ASTContext. - Added a new smart pointer ExprOwningPtr to Sema.h. This replaces the uses of llvm::OwningPtr within Sema, as llvm::OwningPtr used 'delete' to free memory instead of a Stmt's 'Destroy' method. Big thanks to Doug Gregor for helping with the acrobatics of making 'new/delete' private and the new smart pointer ExprOwningPtr! git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63997 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-07 04:47:29 +03:00
if (isArgumentType()) {
this->~SizeOfAlignOfExpr();
C.Deallocate(this);
}
else
Expr::Destroy(C);
}
//===----------------------------------------------------------------------===//
// DesignatedInitExpr
//===----------------------------------------------------------------------===//
IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() {
assert(Kind == FieldDesignator && "Only valid on a field designator");
if (Field.NameOrField & 0x01)
return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
else
return getField()->getIdentifier();
}
DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators,
const Designator *Designators,
SourceLocation EqualOrColonLoc,
bool GNUSyntax,
Expr **IndexExprs,
unsigned NumIndexExprs,
Expr *Init)
: Expr(DesignatedInitExprClass, Ty,
Init->isTypeDependent(), Init->isValueDependent()),
EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) {
this->Designators = new Designator[NumDesignators];
// Record the initializer itself.
child_iterator Child = child_begin();
*Child++ = Init;
// Copy the designators and their subexpressions, computing
// value-dependence along the way.
unsigned IndexIdx = 0;
for (unsigned I = 0; I != NumDesignators; ++I) {
this->Designators[I] = Designators[I];
if (this->Designators[I].isArrayDesignator()) {
// Compute type- and value-dependence.
Expr *Index = IndexExprs[IndexIdx];
ValueDependent = ValueDependent ||
Index->isTypeDependent() || Index->isValueDependent();
// Copy the index expressions into permanent storage.
*Child++ = IndexExprs[IndexIdx++];
} else if (this->Designators[I].isArrayRangeDesignator()) {
// Compute type- and value-dependence.
Expr *Start = IndexExprs[IndexIdx];
Expr *End = IndexExprs[IndexIdx + 1];
ValueDependent = ValueDependent ||
Start->isTypeDependent() || Start->isValueDependent() ||
End->isTypeDependent() || End->isValueDependent();
// Copy the start/end expressions into permanent storage.
*Child++ = IndexExprs[IndexIdx++];
*Child++ = IndexExprs[IndexIdx++];
}
}
assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions");
}
DesignatedInitExpr *
DesignatedInitExpr::Create(ASTContext &C, Designator *Designators,
unsigned NumDesignators,
Expr **IndexExprs, unsigned NumIndexExprs,
SourceLocation ColonOrEqualLoc,
bool UsesColonSyntax, Expr *Init) {
void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
sizeof(Stmt *) * (NumIndexExprs + 1), 8);
return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators,
ColonOrEqualLoc, UsesColonSyntax,
IndexExprs, NumIndexExprs, Init);
}
DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C,
unsigned NumIndexExprs) {
void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
sizeof(Stmt *) * (NumIndexExprs + 1), 8);
return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
}
void DesignatedInitExpr::setDesignators(const Designator *Desigs,
unsigned NumDesigs) {
if (Designators)
delete [] Designators;
Designators = new Designator[NumDesigs];
NumDesignators = NumDesigs;
for (unsigned I = 0; I != NumDesigs; ++I)
Designators[I] = Desigs[I];
}
SourceRange DesignatedInitExpr::getSourceRange() const {
SourceLocation StartLoc;
Designator &First =
*const_cast<DesignatedInitExpr*>(this)->designators_begin();
if (First.isFieldDesignator()) {
if (GNUSyntax)
StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
else
StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc);
} else
StartLoc =
SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc);
return SourceRange(StartLoc, getInit()->getSourceRange().getEnd());
}
Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) {
assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
char* Ptr = static_cast<char*>(static_cast<void *>(this));
Ptr += sizeof(DesignatedInitExpr);
Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
}
Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) {
assert(D.Kind == Designator::ArrayRangeDesignator &&
"Requires array range designator");
char* Ptr = static_cast<char*>(static_cast<void *>(this));
Ptr += sizeof(DesignatedInitExpr);
Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
}
Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) {
assert(D.Kind == Designator::ArrayRangeDesignator &&
"Requires array range designator");
char* Ptr = static_cast<char*>(static_cast<void *>(this));
Ptr += sizeof(DesignatedInitExpr);
Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2));
}
/// \brief Replaces the designator at index @p Idx with the series
/// of designators in [First, Last).
void DesignatedInitExpr::ExpandDesignator(unsigned Idx,
const Designator *First,
const Designator *Last) {
unsigned NumNewDesignators = Last - First;
if (NumNewDesignators == 0) {
std::copy_backward(Designators + Idx + 1,
Designators + NumDesignators,
Designators + Idx);
--NumNewDesignators;
return;
} else if (NumNewDesignators == 1) {
Designators[Idx] = *First;
return;
}
Designator *NewDesignators
= new Designator[NumDesignators - 1 + NumNewDesignators];
std::copy(Designators, Designators + Idx, NewDesignators);
std::copy(First, Last, NewDesignators + Idx);
std::copy(Designators + Idx + 1, Designators + NumDesignators,
NewDesignators + Idx + NumNewDesignators);
delete [] Designators;
Designators = NewDesignators;
NumDesignators = NumDesignators - 1 + NumNewDesignators;
}
void DesignatedInitExpr::Destroy(ASTContext &C) {
delete [] Designators;
Expr::Destroy(C);
}
ImplicitValueInitExpr *ImplicitValueInitExpr::Clone(ASTContext &C) const {
return new (C) ImplicitValueInitExpr(getType());
}
//===----------------------------------------------------------------------===//
// ExprIterator.
//===----------------------------------------------------------------------===//
Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); }
Expr* ExprIterator::operator*() const { return cast<Expr>(*I); }
Expr* ExprIterator::operator->() const { return cast<Expr>(*I); }
const Expr* ConstExprIterator::operator[](size_t idx) const {
return cast<Expr>(I[idx]);
}
const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); }
const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); }
//===----------------------------------------------------------------------===//
// Child Iterators for iterating over subexpressions/substatements
//===----------------------------------------------------------------------===//
// DeclRefExpr
Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); }
// ObjCIvarRefExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; }
Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; }
// ObjCPropertyRefExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; }
Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; }
// ObjCKVCRefExpr
Stmt::child_iterator ObjCKVCRefExpr::child_begin() { return &Base; }
Stmt::child_iterator ObjCKVCRefExpr::child_end() { return &Base+1; }
// ObjCSuperExpr
Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); }
// PredefinedExpr
Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); }
// IntegerLiteral
Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); }
Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); }
// CharacterLiteral
Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();}
Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); }
// FloatingLiteral
Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); }
Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); }
// ImaginaryLiteral
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; }
Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; }
// StringLiteral
Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); }
Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); }
// ParenExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator ParenExpr::child_begin() { return &Val; }
Stmt::child_iterator ParenExpr::child_end() { return &Val+1; }
// UnaryOperator
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator UnaryOperator::child_begin() { return &Val; }
Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; }
// SizeOfAlignOfExpr
Stmt::child_iterator SizeOfAlignOfExpr::child_begin() {
// If this is of a type and the type is a VLA type (and not a typedef), the
// size expression of the VLA needs to be treated as an executable expression.
// Why isn't this weirdness documented better in StmtIterator?
if (isArgumentType()) {
if (VariableArrayType* T = dyn_cast<VariableArrayType>(
getArgumentType().getTypePtr()))
return child_iterator(T);
return child_iterator();
}
return child_iterator(&Argument.Ex);
}
Stmt::child_iterator SizeOfAlignOfExpr::child_end() {
if (isArgumentType())
return child_iterator();
return child_iterator(&Argument.Ex + 1);
}
// ArraySubscriptExpr
Stmt::child_iterator ArraySubscriptExpr::child_begin() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0];
}
Stmt::child_iterator ArraySubscriptExpr::child_end() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0]+END_EXPR;
}
// CallExpr
Stmt::child_iterator CallExpr::child_begin() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0];
}
Stmt::child_iterator CallExpr::child_end() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0]+NumArgs+ARGS_START;
}
// MemberExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator MemberExpr::child_begin() { return &Base; }
Stmt::child_iterator MemberExpr::child_end() { return &Base+1; }
// ExtVectorElementExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; }
Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; }
// CompoundLiteralExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; }
Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; }
// CastExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator CastExpr::child_begin() { return &Op; }
Stmt::child_iterator CastExpr::child_end() { return &Op+1; }
// BinaryOperator
Stmt::child_iterator BinaryOperator::child_begin() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0];
}
Stmt::child_iterator BinaryOperator::child_end() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0]+END_EXPR;
}
// ConditionalOperator
Stmt::child_iterator ConditionalOperator::child_begin() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0];
}
Stmt::child_iterator ConditionalOperator::child_end() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0]+END_EXPR;
}
// AddrLabelExpr
Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); }
// StmtExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; }
Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; }
// TypesCompatibleExpr
Stmt::child_iterator TypesCompatibleExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator TypesCompatibleExpr::child_end() {
return child_iterator();
}
// ChooseExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; }
Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; }
// GNUNullExpr
Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); }
// ShuffleVectorExpr
Stmt::child_iterator ShuffleVectorExpr::child_begin() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0];
}
Stmt::child_iterator ShuffleVectorExpr::child_end() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0]+NumExprs;
}
// VAArgExpr
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
Stmt::child_iterator VAArgExpr::child_begin() { return &Val; }
Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; }
// InitListExpr
Stmt::child_iterator InitListExpr::child_begin() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return InitExprs.size() ? &InitExprs[0] : 0;
}
Stmt::child_iterator InitListExpr::child_end() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0;
}
// DesignatedInitExpr
Stmt::child_iterator DesignatedInitExpr::child_begin() {
char* Ptr = static_cast<char*>(static_cast<void *>(this));
Ptr += sizeof(DesignatedInitExpr);
return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
}
Stmt::child_iterator DesignatedInitExpr::child_end() {
return child_iterator(&*child_begin() + NumSubExprs);
}
// ImplicitValueInitExpr
Stmt::child_iterator ImplicitValueInitExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator ImplicitValueInitExpr::child_end() {
return child_iterator();
}
// ObjCStringLiteral
Stmt::child_iterator ObjCStringLiteral::child_begin() {
return &String;
}
Stmt::child_iterator ObjCStringLiteral::child_end() {
return &String+1;
}
// ObjCEncodeExpr
Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); }
// ObjCSelectorExpr
Stmt::child_iterator ObjCSelectorExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator ObjCSelectorExpr::child_end() {
return child_iterator();
}
// ObjCProtocolExpr
Stmt::child_iterator ObjCProtocolExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator ObjCProtocolExpr::child_end() {
return child_iterator();
}
// ObjCMessageExpr
Stmt::child_iterator ObjCMessageExpr::child_begin() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START;
}
Stmt::child_iterator ObjCMessageExpr::child_end() {
This patch is motivated by numerous strict-aliasing warnings when compiling clang as a Release build. The big change is that all AST nodes (subclasses of Stmt) whose children are Expr* store their children as Stmt* or arrays of Stmt*. This is to remove strict-aliasing warnings when using StmtIterator. None of the interfaces of any of the classes have changed (except those with arg_iterators, see below), as the accessor methods introduce the needed casts (via cast<>). While this extra casting may seem cumbersome, it actually adds some important sanity checks throughout the codebase, as clients using StmtIterator can potentially overwrite children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts provide extra sanity checks that are operational in debug builds to catch invariant violations such as these. For classes that have arg_iterators (e.g., CallExpr), the definition of arg_iterator has been replaced. Instead of it being Expr**, it is an actual class (called ExprIterator) that wraps a Stmt**, and provides the necessary operators for iteration. The nice thing about this class is that it also uses cast<> to type-checking, which introduces extra sanity checks throughout the codebase that are useful for debugging. A few of the CodeGen functions that use arg_iterator (especially from OverloadExpr) have been modified to take begin and end iterators instead of a base Expr** and the number of arguments. This matches more with the abstraction of iteration. This still needs to be cleaned up a little bit, as clients expect that ExprIterator is a RandomAccessIterator (which we may or may not wish to allow for efficiency of representation). This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c, which was already broken) on both a Debug and Release build, but it should obviously be reviewed. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52378 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-17 06:43:46 +04:00
return &SubExprs[0]+ARGS_START+getNumArgs();
}
// Blocks
Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); }
Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();}
Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); }