clang-1/AST/StmtPrinter.cpp

676 строки
18 KiB
C++

//===--- StmtPrinter.cpp - Printing implementation for Stmt ASTs ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Stmt::dumpPretty/Stmt::printPretty methods, which
// pretty print the AST back out to C code.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/StmtVisitor.h"
#include "clang/AST/Decl.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/PrettyPrinter.h"
#include "clang/Basic/IdentifierTable.h"
#include "llvm/Support/Compiler.h"
#include <iostream>
#include <iomanip>
using namespace clang;
//===----------------------------------------------------------------------===//
// StmtPrinter Visitor
//===----------------------------------------------------------------------===//
namespace {
class VISIBILITY_HIDDEN StmtPrinter : public StmtVisitor<StmtPrinter> {
std::ostream &OS;
unsigned IndentLevel;
clang::PrinterHelper* Helper;
public:
StmtPrinter(std::ostream &os, PrinterHelper* helper) :
OS(os), IndentLevel(0), Helper(helper) {}
void PrintStmt(Stmt *S, int SubIndent = 1) {
IndentLevel += SubIndent;
if (S && isa<Expr>(S)) {
// If this is an expr used in a stmt context, indent and newline it.
Indent();
Visit(S);
OS << ";\n";
} else if (S) {
Visit(S);
} else {
Indent() << "<<<NULL STATEMENT>>>\n";
}
IndentLevel -= SubIndent;
}
void PrintRawCompoundStmt(CompoundStmt *S);
void PrintRawDecl(Decl *D);
void PrintRawIfStmt(IfStmt *If);
void PrintExpr(Expr *E) {
if (E)
Visit(E);
else
OS << "<null expr>";
}
std::ostream &Indent(int Delta = 0) const {
for (int i = 0, e = IndentLevel+Delta; i < e; ++i)
OS << " ";
return OS;
}
bool PrintOffsetOfDesignator(Expr *E);
void VisitUnaryOffsetOf(UnaryOperator *Node);
void Visit(Stmt* S) {
if (Helper && Helper->handledStmt(S,OS))
return;
else StmtVisitor<StmtPrinter>::Visit(S);
}
void VisitStmt(Stmt *Node);
#define STMT(N, CLASS, PARENT) \
void Visit##CLASS(CLASS *Node);
#include "clang/AST/StmtNodes.def"
};
}
//===----------------------------------------------------------------------===//
// Stmt printing methods.
//===----------------------------------------------------------------------===//
void StmtPrinter::VisitStmt(Stmt *Node) {
Indent() << "<<unknown stmt type>>\n";
}
/// PrintRawCompoundStmt - Print a compound stmt without indenting the {, and
/// with no newline after the }.
void StmtPrinter::PrintRawCompoundStmt(CompoundStmt *Node) {
OS << "{\n";
for (CompoundStmt::body_iterator I = Node->body_begin(), E = Node->body_end();
I != E; ++I)
PrintStmt(*I);
Indent() << "}";
}
void StmtPrinter::PrintRawDecl(Decl *D) {
// FIXME: Need to complete/beautify this... this code simply shows the
// nodes are where they need to be.
if (TypedefDecl *localType = dyn_cast<TypedefDecl>(D)) {
OS << "typedef " << localType->getUnderlyingType().getAsString();
OS << " " << localType->getName();
} else if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
// Emit storage class for vardecls.
if (VarDecl *V = dyn_cast<VarDecl>(VD)) {
switch (V->getStorageClass()) {
default: assert(0 && "Unknown storage class!");
case VarDecl::None: break;
case VarDecl::Extern: OS << "extern "; break;
case VarDecl::Static: OS << "static "; break;
case VarDecl::Auto: OS << "auto "; break;
case VarDecl::Register: OS << "register "; break;
}
}
std::string Name = VD->getName();
VD->getType().getAsStringInternal(Name);
OS << Name;
// If this is a vardecl with an initializer, emit it.
if (VarDecl *V = dyn_cast<VarDecl>(VD)) {
if (V->getInit()) {
OS << " = ";
PrintExpr(V->getInit());
}
}
} else {
// FIXME: "struct x;"
assert(0 && "Unexpected decl");
}
}
void StmtPrinter::VisitNullStmt(NullStmt *Node) {
Indent() << ";\n";
}
void StmtPrinter::VisitDeclStmt(DeclStmt *Node) {
for (ScopedDecl *D = Node->getDecl(); D; D = D->getNextDeclarator()) {
Indent();
PrintRawDecl(D);
OS << ";\n";
}
}
void StmtPrinter::VisitCompoundStmt(CompoundStmt *Node) {
Indent();
PrintRawCompoundStmt(Node);
OS << "\n";
}
void StmtPrinter::VisitCaseStmt(CaseStmt *Node) {
Indent(-1) << "case ";
PrintExpr(Node->getLHS());
if (Node->getRHS()) {
OS << " ... ";
PrintExpr(Node->getRHS());
}
OS << ":\n";
PrintStmt(Node->getSubStmt(), 0);
}
void StmtPrinter::VisitDefaultStmt(DefaultStmt *Node) {
Indent(-1) << "default:\n";
PrintStmt(Node->getSubStmt(), 0);
}
void StmtPrinter::VisitLabelStmt(LabelStmt *Node) {
Indent(-1) << Node->getName() << ":\n";
PrintStmt(Node->getSubStmt(), 0);
}
void StmtPrinter::PrintRawIfStmt(IfStmt *If) {
OS << "if ";
PrintExpr(If->getCond());
if (CompoundStmt *CS = dyn_cast<CompoundStmt>(If->getThen())) {
OS << ' ';
PrintRawCompoundStmt(CS);
OS << (If->getElse() ? ' ' : '\n');
} else {
OS << '\n';
PrintStmt(If->getThen());
if (If->getElse()) Indent();
}
if (Stmt *Else = If->getElse()) {
OS << "else";
if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Else)) {
OS << ' ';
PrintRawCompoundStmt(CS);
OS << '\n';
} else if (IfStmt *ElseIf = dyn_cast<IfStmt>(Else)) {
OS << ' ';
PrintRawIfStmt(ElseIf);
} else {
OS << '\n';
PrintStmt(If->getElse());
}
}
}
void StmtPrinter::VisitIfStmt(IfStmt *If) {
Indent();
PrintRawIfStmt(If);
}
void StmtPrinter::VisitSwitchStmt(SwitchStmt *Node) {
Indent() << "switch (";
PrintExpr(Node->getCond());
OS << ")";
// Pretty print compoundstmt bodies (very common).
if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
OS << " ";
PrintRawCompoundStmt(CS);
OS << "\n";
} else {
OS << "\n";
PrintStmt(Node->getBody());
}
}
void StmtPrinter::VisitSwitchCase(SwitchCase*) {
assert(0 && "SwitchCase is an abstract class");
}
void StmtPrinter::VisitWhileStmt(WhileStmt *Node) {
Indent() << "while (";
PrintExpr(Node->getCond());
OS << ")\n";
PrintStmt(Node->getBody());
}
void StmtPrinter::VisitDoStmt(DoStmt *Node) {
Indent() << "do ";
if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
PrintRawCompoundStmt(CS);
OS << " ";
} else {
OS << "\n";
PrintStmt(Node->getBody());
Indent();
}
OS << "while ";
PrintExpr(Node->getCond());
OS << ";\n";
}
void StmtPrinter::VisitForStmt(ForStmt *Node) {
Indent() << "for (";
if (Node->getInit()) {
if (DeclStmt *DS = dyn_cast<DeclStmt>(Node->getInit()))
PrintRawDecl(DS->getDecl());
else
PrintExpr(cast<Expr>(Node->getInit()));
}
OS << ";";
if (Node->getCond()) {
OS << " ";
PrintExpr(Node->getCond());
}
OS << ";";
if (Node->getInc()) {
OS << " ";
PrintExpr(Node->getInc());
}
OS << ") ";
if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
PrintRawCompoundStmt(CS);
OS << "\n";
} else {
OS << "\n";
PrintStmt(Node->getBody());
}
}
void StmtPrinter::VisitGotoStmt(GotoStmt *Node) {
Indent() << "goto " << Node->getLabel()->getName() << ";\n";
}
void StmtPrinter::VisitIndirectGotoStmt(IndirectGotoStmt *Node) {
Indent() << "goto *";
PrintExpr(Node->getTarget());
OS << ";\n";
}
void StmtPrinter::VisitContinueStmt(ContinueStmt *Node) {
Indent() << "continue;\n";
}
void StmtPrinter::VisitBreakStmt(BreakStmt *Node) {
Indent() << "break;\n";
}
void StmtPrinter::VisitReturnStmt(ReturnStmt *Node) {
Indent() << "return";
if (Node->getRetValue()) {
OS << " ";
PrintExpr(Node->getRetValue());
}
OS << ";\n";
}
//===----------------------------------------------------------------------===//
// Expr printing methods.
//===----------------------------------------------------------------------===//
void StmtPrinter::VisitExpr(Expr *Node) {
OS << "<<unknown expr type>>";
}
void StmtPrinter::VisitDeclRefExpr(DeclRefExpr *Node) {
OS << Node->getDecl()->getName();
}
void StmtPrinter::VisitPreDefinedExpr(PreDefinedExpr *Node) {
switch (Node->getIdentType()) {
default:
assert(0 && "unknown case");
case PreDefinedExpr::Func:
OS << "__func__";
break;
case PreDefinedExpr::Function:
OS << "__FUNCTION__";
break;
case PreDefinedExpr::PrettyFunction:
OS << "__PRETTY_FUNCTION__";
break;
}
}
void StmtPrinter::VisitCharacterLiteral(CharacterLiteral *Node) {
// FIXME should print an L for wchar_t constants
unsigned value = Node->getValue();
switch (value) {
case '\\':
OS << "'\\\\'";
break;
case '\'':
OS << "'\\''";
break;
case '\a':
// TODO: K&R: the meaning of '\\a' is different in traditional C
OS << "'\\a'";
break;
case '\b':
OS << "'\\b'";
break;
// Nonstandard escape sequence.
/*case '\e':
OS << "'\\e'";
break;*/
case '\f':
OS << "'\\f'";
break;
case '\n':
OS << "'\\n'";
break;
case '\r':
OS << "'\\r'";
break;
case '\t':
OS << "'\\t'";
break;
case '\v':
OS << "'\\v'";
break;
default:
if (isprint(value) && value < 256) {
OS << "'" << (char)value << "'";
} else if (value < 256) {
OS << "'\\x" << std::hex << value << std::dec << "'";
} else {
// FIXME what to really do here?
OS << value;
}
}
}
void StmtPrinter::VisitIntegerLiteral(IntegerLiteral *Node) {
bool isSigned = Node->getType()->isSignedIntegerType();
OS << Node->getValue().toString(10, isSigned);
// Emit suffixes. Integer literals are always a builtin integer type.
switch (cast<BuiltinType>(Node->getType().getCanonicalType())->getKind()) {
default: assert(0 && "Unexpected type for integer literal!");
case BuiltinType::Int: break; // no suffix.
case BuiltinType::UInt: OS << 'U'; break;
case BuiltinType::Long: OS << 'L'; break;
case BuiltinType::ULong: OS << "UL"; break;
case BuiltinType::LongLong: OS << "LL"; break;
case BuiltinType::ULongLong: OS << "ULL"; break;
}
}
void StmtPrinter::VisitFloatingLiteral(FloatingLiteral *Node) {
// FIXME: print value more precisely.
OS << Node->getValueAsDouble();
}
void StmtPrinter::VisitImaginaryLiteral(ImaginaryLiteral *Node) {
PrintExpr(Node->getSubExpr());
OS << "i";
}
void StmtPrinter::VisitStringLiteral(StringLiteral *Str) {
if (Str->isWide()) OS << 'L';
OS << '"';
// FIXME: this doesn't print wstrings right.
for (unsigned i = 0, e = Str->getByteLength(); i != e; ++i) {
switch (Str->getStrData()[i]) {
default: OS << Str->getStrData()[i]; break;
// Handle some common ones to make dumps prettier.
case '\\': OS << "\\\\"; break;
case '"': OS << "\\\""; break;
case '\n': OS << "\\n"; break;
case '\t': OS << "\\t"; break;
case '\a': OS << "\\a"; break;
case '\b': OS << "\\b"; break;
}
}
OS << '"';
}
void StmtPrinter::VisitParenExpr(ParenExpr *Node) {
OS << "(";
PrintExpr(Node->getSubExpr());
OS << ")";
}
void StmtPrinter::VisitUnaryOperator(UnaryOperator *Node) {
if (!Node->isPostfix()) {
OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
// Print a space if this is an "identifier operator" like sizeof or __real.
switch (Node->getOpcode()) {
default: break;
case UnaryOperator::SizeOf:
case UnaryOperator::AlignOf:
case UnaryOperator::Real:
case UnaryOperator::Imag:
case UnaryOperator::Extension:
OS << ' ';
break;
}
}
PrintExpr(Node->getSubExpr());
if (Node->isPostfix())
OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
}
bool StmtPrinter::PrintOffsetOfDesignator(Expr *E) {
if (isa<CompoundLiteralExpr>(E)) {
// Base case, print the type and comma.
OS << E->getType().getAsString() << ", ";
return true;
} else if (ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) {
PrintOffsetOfDesignator(ASE->getLHS());
OS << "[";
PrintExpr(ASE->getRHS());
OS << "]";
return false;
} else {
MemberExpr *ME = cast<MemberExpr>(E);
bool IsFirst = PrintOffsetOfDesignator(ME->getBase());
OS << (IsFirst ? "" : ".") << ME->getMemberDecl()->getName();
return false;
}
}
void StmtPrinter::VisitUnaryOffsetOf(UnaryOperator *Node) {
OS << "__builtin_offsetof(";
PrintOffsetOfDesignator(Node->getSubExpr());
OS << ")";
}
void StmtPrinter::VisitSizeOfAlignOfTypeExpr(SizeOfAlignOfTypeExpr *Node) {
OS << (Node->isSizeOf() ? "sizeof(" : "__alignof(");
OS << Node->getArgumentType().getAsString() << ")";
}
void StmtPrinter::VisitArraySubscriptExpr(ArraySubscriptExpr *Node) {
PrintExpr(Node->getLHS());
OS << "[";
PrintExpr(Node->getRHS());
OS << "]";
}
void StmtPrinter::VisitCallExpr(CallExpr *Call) {
PrintExpr(Call->getCallee());
OS << "(";
for (unsigned i = 0, e = Call->getNumArgs(); i != e; ++i) {
if (i) OS << ", ";
PrintExpr(Call->getArg(i));
}
OS << ")";
}
void StmtPrinter::VisitMemberExpr(MemberExpr *Node) {
PrintExpr(Node->getBase());
OS << (Node->isArrow() ? "->" : ".");
FieldDecl *Field = Node->getMemberDecl();
assert(Field && "MemberExpr should alway reference a field!");
OS << Field->getName();
}
void StmtPrinter::VisitOCUVectorElementExpr(OCUVectorElementExpr *Node) {
PrintExpr(Node->getBase());
OS << ".";
OS << Node->getAccessor().getName();
}
void StmtPrinter::VisitCastExpr(CastExpr *Node) {
OS << "(" << Node->getType().getAsString() << ")";
PrintExpr(Node->getSubExpr());
}
void StmtPrinter::VisitCompoundLiteralExpr(CompoundLiteralExpr *Node) {
OS << "(" << Node->getType().getAsString() << ")";
PrintExpr(Node->getInitializer());
}
void StmtPrinter::VisitImplicitCastExpr(ImplicitCastExpr *Node) {
// No need to print anything, simply forward to the sub expression.
PrintExpr(Node->getSubExpr());
}
void StmtPrinter::VisitBinaryOperator(BinaryOperator *Node) {
PrintExpr(Node->getLHS());
OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
PrintExpr(Node->getRHS());
}
void StmtPrinter::VisitCompoundAssignOperator(CompoundAssignOperator *Node) {
PrintExpr(Node->getLHS());
OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
PrintExpr(Node->getRHS());
}
void StmtPrinter::VisitConditionalOperator(ConditionalOperator *Node) {
PrintExpr(Node->getCond());
OS << " ? ";
PrintExpr(Node->getLHS());
OS << " : ";
PrintExpr(Node->getRHS());
}
// GNU extensions.
void StmtPrinter::VisitAddrLabelExpr(AddrLabelExpr *Node) {
OS << "&&" << Node->getLabel()->getName();
}
void StmtPrinter::VisitStmtExpr(StmtExpr *E) {
OS << "(";
PrintRawCompoundStmt(E->getSubStmt());
OS << ")";
}
void StmtPrinter::VisitTypesCompatibleExpr(TypesCompatibleExpr *Node) {
OS << "__builtin_types_compatible_p(";
OS << Node->getArgType1().getAsString() << ",";
OS << Node->getArgType2().getAsString() << ")";
}
void StmtPrinter::VisitChooseExpr(ChooseExpr *Node) {
OS << "__builtin_choose_expr(";
PrintExpr(Node->getCond());
OS << ", ";
PrintExpr(Node->getLHS());
OS << ", ";
PrintExpr(Node->getRHS());
OS << ")";
}
void StmtPrinter::VisitInitListExpr(InitListExpr* Node) {
OS << "{ ";
for (unsigned i = 0, e = Node->getNumInits(); i != e; ++i) {
if (i) OS << ", ";
PrintExpr(Node->getInit(i));
}
OS << " }";
}
void StmtPrinter::VisitVAArgExpr(VAArgExpr *Node) {
OS << "va_arg(";
PrintExpr(Node->getSubExpr());
OS << ", ";
OS << Node->getType().getAsString();
OS << ")";
}
// C++
void StmtPrinter::VisitCXXCastExpr(CXXCastExpr *Node) {
OS << CXXCastExpr::getOpcodeStr(Node->getOpcode()) << '<';
OS << Node->getDestType().getAsString() << ">(";
PrintExpr(Node->getSubExpr());
OS << ")";
}
void StmtPrinter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *Node) {
OS << (Node->getValue() ? "true" : "false");
}
// Obj-C
void StmtPrinter::VisitObjCStringLiteral(ObjCStringLiteral *Node) {
OS << "@";
VisitStringLiteral(Node->getString());
}
void StmtPrinter::VisitObjCEncodeExpr(ObjCEncodeExpr *Node) {
OS << "@encode(";
OS << Node->getEncodedType().getAsString() << ")";
}
void StmtPrinter::VisitObjCSelectorExpr(ObjCSelectorExpr *Node) {
OS << "@selector(";
Selector &selector = Node->getSelector();
OS << " " << selector.getName();
OS << ")";
}
void StmtPrinter::VisitObjCMessageExpr(ObjCMessageExpr *Mess) {
OS << "[";
Expr *receiver = Mess->getReceiver();
if (receiver) PrintExpr(receiver);
else OS << Mess->getClassName()->getName();
Selector &selector = Mess->getSelector();
if (selector.isUnarySelector()) {
OS << " " << selector.getIdentifierInfoForSlot(0)->getName();
} else {
for (unsigned i = 0, e = Mess->getNumArgs(); i != e; ++i) {
if (selector.getIdentifierInfoForSlot(i))
OS << selector.getIdentifierInfoForSlot(i)->getName() << ":";
else
OS << ":";
PrintExpr(Mess->getArg(i));
}
}
OS << "]";
}
//===----------------------------------------------------------------------===//
// Stmt method implementations
//===----------------------------------------------------------------------===//
void Stmt::dumpPretty() const {
// FIXME: eliminate use of <iostream>
printPretty(std::cerr);
}
void Stmt::printPretty(std::ostream &OS, PrinterHelper* Helper) const {
if (this == 0) {
OS << "<NULL>";
return;
}
StmtPrinter P(OS, Helper);
P.Visit(const_cast<Stmt*>(this));
}
//===----------------------------------------------------------------------===//
// PrinterHelper
//===----------------------------------------------------------------------===//
// Implement virtual destructor.
PrinterHelper::~PrinterHelper() {}