зеркало из https://github.com/microsoft/clang-1.git
568 строки
20 KiB
C++
568 строки
20 KiB
C++
//===--- CGExprConstant.cpp - Emit LLVM Code from Constant Expressions ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code to emit Constant Expr nodes as LLVM code.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "CGObjCRuntime.h"
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#include "clang/AST/APValue.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/StmtVisitor.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Target/TargetData.h"
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using namespace clang;
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using namespace CodeGen;
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namespace {
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class VISIBILITY_HIDDEN ConstExprEmitter :
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public StmtVisitor<ConstExprEmitter, llvm::Constant*> {
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CodeGenModule &CGM;
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CodeGenFunction *CGF;
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public:
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ConstExprEmitter(CodeGenModule &cgm, CodeGenFunction *cgf)
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: CGM(cgm), CGF(cgf) {
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}
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//===--------------------------------------------------------------------===//
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// Visitor Methods
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//===--------------------------------------------------------------------===//
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llvm::Constant *VisitStmt(Stmt *S) {
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return 0;
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}
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llvm::Constant *VisitParenExpr(ParenExpr *PE) {
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return Visit(PE->getSubExpr());
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}
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llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
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return Visit(E->getInitializer());
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}
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llvm::Constant *VisitCastExpr(CastExpr* E) {
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// GCC cast to union extension
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if (E->getType()->isUnionType()) {
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const llvm::Type *Ty = ConvertType(E->getType());
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return EmitUnion(CGM.EmitConstantExpr(E->getSubExpr(), CGF), Ty);
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}
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if (CGM.getContext().getCanonicalType(E->getSubExpr()->getType()) ==
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CGM.getContext().getCanonicalType(E->getType())) {
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return Visit(E->getSubExpr());
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}
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return 0;
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}
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llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
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return Visit(DAE->getExpr());
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}
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llvm::Constant *EmitArrayInitialization(InitListExpr *ILE) {
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std::vector<llvm::Constant*> Elts;
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const llvm::ArrayType *AType =
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cast<llvm::ArrayType>(ConvertType(ILE->getType()));
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unsigned NumInitElements = ILE->getNumInits();
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// FIXME: Check for wide strings
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// FIXME: Check for NumInitElements exactly equal to 1??
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if (NumInitElements > 0 &&
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(isa<StringLiteral>(ILE->getInit(0)) ||
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isa<ObjCEncodeExpr>(ILE->getInit(0))) &&
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ILE->getType()->getArrayElementTypeNoTypeQual()->isCharType())
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return Visit(ILE->getInit(0));
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const llvm::Type *ElemTy = AType->getElementType();
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unsigned NumElements = AType->getNumElements();
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// Initialising an array requires us to automatically
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// initialise any elements that have not been initialised explicitly
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unsigned NumInitableElts = std::min(NumInitElements, NumElements);
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// Copy initializer elements.
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unsigned i = 0;
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bool RewriteType = false;
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for (; i < NumInitableElts; ++i) {
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llvm::Constant *C = CGM.EmitConstantExpr(ILE->getInit(i), CGF);
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if (!C)
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return 0;
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RewriteType |= (C->getType() != ElemTy);
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Elts.push_back(C);
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}
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// Initialize remaining array elements.
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for (; i < NumElements; ++i)
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Elts.push_back(llvm::Constant::getNullValue(ElemTy));
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if (RewriteType) {
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// FIXME: Try to avoid packing the array
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std::vector<const llvm::Type*> Types;
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for (unsigned i = 0; i < Elts.size(); ++i)
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Types.push_back(Elts[i]->getType());
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const llvm::StructType *SType = llvm::StructType::get(Types, true);
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return llvm::ConstantStruct::get(SType, Elts);
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}
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return llvm::ConstantArray::get(AType, Elts);
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}
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void InsertBitfieldIntoStruct(std::vector<llvm::Constant*>& Elts,
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FieldDecl* Field, Expr* E) {
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// Calculate the value to insert
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llvm::Constant *C = CGM.EmitConstantExpr(E, CGF);
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if (!C)
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return;
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llvm::ConstantInt *CI = dyn_cast<llvm::ConstantInt>(C);
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if (!CI) {
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CGM.ErrorUnsupported(E, "bitfield initialization");
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return;
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}
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llvm::APInt V = CI->getValue();
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// Calculate information about the relevant field
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const llvm::Type* Ty = CI->getType();
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const llvm::TargetData &TD = CGM.getTypes().getTargetData();
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unsigned size = TD.getTypePaddedSizeInBits(Ty);
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unsigned fieldOffset = CGM.getTypes().getLLVMFieldNo(Field) * size;
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CodeGenTypes::BitFieldInfo bitFieldInfo =
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CGM.getTypes().getBitFieldInfo(Field);
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fieldOffset += bitFieldInfo.Begin;
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// Find where to start the insertion
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// FIXME: This is O(n^2) in the number of bit-fields!
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// FIXME: This won't work if the struct isn't completely packed!
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unsigned offset = 0, i = 0;
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while (offset < (fieldOffset & -8))
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offset += TD.getTypePaddedSizeInBits(Elts[i++]->getType());
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// Advance over 0 sized elements (must terminate in bounds since
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// the bitfield must have a size).
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while (TD.getTypePaddedSizeInBits(Elts[i]->getType()) == 0)
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++i;
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// Promote the size of V if necessary
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// FIXME: This should never occur, but currently it can because
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// initializer constants are cast to bool, and because clang is
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// not enforcing bitfield width limits.
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if (bitFieldInfo.Size > V.getBitWidth())
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V.zext(bitFieldInfo.Size);
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// Insert the bits into the struct
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// FIXME: This algorthm is only correct on X86!
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// FIXME: THis algorthm assumes bit-fields only have byte-size elements!
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unsigned bitsToInsert = bitFieldInfo.Size;
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unsigned curBits = std::min(8 - (fieldOffset & 7), bitsToInsert);
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unsigned byte = V.getLoBits(curBits).getZExtValue() << (fieldOffset & 7);
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do {
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llvm::Constant* byteC = llvm::ConstantInt::get(llvm::Type::Int8Ty, byte);
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Elts[i] = llvm::ConstantExpr::getOr(Elts[i], byteC);
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++i;
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V = V.lshr(curBits);
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bitsToInsert -= curBits;
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if (!bitsToInsert)
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break;
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curBits = bitsToInsert > 8 ? 8 : bitsToInsert;
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byte = V.getLoBits(curBits).getZExtValue();
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} while (true);
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}
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llvm::Constant *EmitStructInitialization(InitListExpr *ILE) {
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const llvm::StructType *SType =
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cast<llvm::StructType>(ConvertType(ILE->getType()));
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RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl();
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std::vector<llvm::Constant*> Elts;
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// Initialize the whole structure to zero.
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for (unsigned i = 0; i < SType->getNumElements(); ++i) {
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const llvm::Type *FieldTy = SType->getElementType(i);
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Elts.push_back(llvm::Constant::getNullValue(FieldTy));
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}
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// Copy initializer elements. Skip padding fields.
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unsigned EltNo = 0; // Element no in ILE
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int FieldNo = 0; // Field no in RecordDecl
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bool RewriteType = false;
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for (RecordDecl::field_iterator Field = RD->field_begin(),
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FieldEnd = RD->field_end();
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EltNo < ILE->getNumInits() && Field != FieldEnd; ++Field) {
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FieldNo++;
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if (!Field->getIdentifier())
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continue;
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if (Field->isBitField()) {
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InsertBitfieldIntoStruct(Elts, *Field, ILE->getInit(EltNo));
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} else {
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unsigned FieldNo = CGM.getTypes().getLLVMFieldNo(*Field);
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llvm::Constant *C = CGM.EmitConstantExpr(ILE->getInit(EltNo), CGF);
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if (!C) return 0;
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RewriteType |= (C->getType() != Elts[FieldNo]->getType());
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Elts[FieldNo] = C;
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}
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EltNo++;
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}
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if (RewriteType) {
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// FIXME: Make this work for non-packed structs
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assert(SType->isPacked() && "Cannot recreate unpacked structs");
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std::vector<const llvm::Type*> Types;
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for (unsigned i = 0; i < Elts.size(); ++i)
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Types.push_back(Elts[i]->getType());
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SType = llvm::StructType::get(Types, true);
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}
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return llvm::ConstantStruct::get(SType, Elts);
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}
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llvm::Constant *EmitUnion(llvm::Constant *C, const llvm::Type *Ty) {
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if (!C)
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return 0;
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// Build a struct with the union sub-element as the first member,
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// and padded to the appropriate size
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std::vector<llvm::Constant*> Elts;
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std::vector<const llvm::Type*> Types;
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Elts.push_back(C);
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Types.push_back(C->getType());
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unsigned CurSize = CGM.getTargetData().getTypePaddedSize(C->getType());
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unsigned TotalSize = CGM.getTargetData().getTypePaddedSize(Ty);
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while (CurSize < TotalSize) {
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Elts.push_back(llvm::Constant::getNullValue(llvm::Type::Int8Ty));
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Types.push_back(llvm::Type::Int8Ty);
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CurSize++;
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}
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// This always generates a packed struct
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// FIXME: Try to generate an unpacked struct when we can
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llvm::StructType* STy = llvm::StructType::get(Types, true);
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return llvm::ConstantStruct::get(STy, Elts);
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}
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llvm::Constant *EmitUnionInitialization(InitListExpr *ILE) {
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const llvm::Type *Ty = ConvertType(ILE->getType());
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// If this is an empty initializer list, we value-initialize the
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// union.
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if (ILE->getNumInits() == 0)
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return llvm::Constant::getNullValue(Ty);
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FieldDecl* curField = ILE->getInitializedFieldInUnion();
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if (!curField) {
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// There's no field to initialize, so value-initialize the union.
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#ifndef NDEBUG
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// Make sure that it's really an empty and not a failure of
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// semantic analysis.
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RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl();
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for (RecordDecl::field_iterator Field = RD->field_begin(),
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FieldEnd = RD->field_end();
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Field != FieldEnd; ++Field)
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assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed");
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#endif
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return llvm::Constant::getNullValue(Ty);
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}
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if (curField->isBitField()) {
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// Create a dummy struct for bit-field insertion
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unsigned NumElts = CGM.getTargetData().getTypePaddedSize(Ty) / 8;
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llvm::Constant* NV = llvm::Constant::getNullValue(llvm::Type::Int8Ty);
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std::vector<llvm::Constant*> Elts(NumElts, NV);
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InsertBitfieldIntoStruct(Elts, curField, ILE->getInit(0));
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const llvm::ArrayType *RetTy =
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llvm::ArrayType::get(NV->getType(), NumElts);
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return llvm::ConstantArray::get(RetTy, Elts);
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}
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return EmitUnion(CGM.EmitConstantExpr(ILE->getInit(0), CGF), Ty);
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}
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llvm::Constant *EmitVectorInitialization(InitListExpr *ILE) {
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const llvm::VectorType *VType =
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cast<llvm::VectorType>(ConvertType(ILE->getType()));
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const llvm::Type *ElemTy = VType->getElementType();
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std::vector<llvm::Constant*> Elts;
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unsigned NumElements = VType->getNumElements();
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unsigned NumInitElements = ILE->getNumInits();
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unsigned NumInitableElts = std::min(NumInitElements, NumElements);
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// Copy initializer elements.
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unsigned i = 0;
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for (; i < NumInitableElts; ++i) {
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llvm::Constant *C = CGM.EmitConstantExpr(ILE->getInit(i), CGF);
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if (!C)
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return 0;
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Elts.push_back(C);
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}
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for (; i < NumElements; ++i)
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Elts.push_back(llvm::Constant::getNullValue(ElemTy));
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return llvm::ConstantVector::get(VType, Elts);
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}
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llvm::Constant *VisitImplicitValueInitExpr(ImplicitValueInitExpr* E) {
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const llvm::Type* RetTy = CGM.getTypes().ConvertType(E->getType());
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return llvm::Constant::getNullValue(RetTy);
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}
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llvm::Constant *VisitInitListExpr(InitListExpr *ILE) {
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if (ILE->getType()->isScalarType()) {
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// We have a scalar in braces. Just use the first element.
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if (ILE->getNumInits() > 0)
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return CGM.EmitConstantExpr(ILE->getInit(0), CGF);
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const llvm::Type* RetTy = CGM.getTypes().ConvertType(ILE->getType());
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return llvm::Constant::getNullValue(RetTy);
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}
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if (ILE->getType()->isArrayType())
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return EmitArrayInitialization(ILE);
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if (ILE->getType()->isStructureType())
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return EmitStructInitialization(ILE);
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if (ILE->getType()->isUnionType())
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return EmitUnionInitialization(ILE);
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if (ILE->getType()->isVectorType())
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return EmitVectorInitialization(ILE);
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assert(0 && "Unable to handle InitListExpr");
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// Get rid of control reaches end of void function warning.
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// Not reached.
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return 0;
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}
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llvm::Constant *VisitStringLiteral(StringLiteral *E) {
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assert(!E->getType()->isPointerType() && "Strings are always arrays");
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// This must be a string initializing an array in a static initializer.
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// Don't emit it as the address of the string, emit the string data itself
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// as an inline array.
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return llvm::ConstantArray::get(CGM.GetStringForStringLiteral(E), false);
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}
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llvm::Constant *VisitObjCEncodeExpr(ObjCEncodeExpr *E) {
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// This must be an @encode initializing an array in a static initializer.
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// Don't emit it as the address of the string, emit the string data itself
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// as an inline array.
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std::string Str;
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CGM.getContext().getObjCEncodingForType(E->getEncodedType(), Str);
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const ConstantArrayType *CAT = cast<ConstantArrayType>(E->getType());
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// Resize the string to the right size, adding zeros at the end, or
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// truncating as needed.
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Str.resize(CAT->getSize().getZExtValue(), '\0');
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return llvm::ConstantArray::get(Str, false);
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}
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llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) {
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return Visit(E->getSubExpr());
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}
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// Utility methods
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const llvm::Type *ConvertType(QualType T) {
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return CGM.getTypes().ConvertType(T);
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}
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public:
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llvm::Constant *EmitLValue(Expr *E) {
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switch (E->getStmtClass()) {
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default: break;
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case Expr::CompoundLiteralExprClass: {
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// Note that due to the nature of compound literals, this is guaranteed
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// to be the only use of the variable, so we just generate it here.
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CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E);
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llvm::Constant* C = Visit(CLE->getInitializer());
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// FIXME: "Leaked" on failure.
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if (C)
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C = new llvm::GlobalVariable(C->getType(),
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E->getType().isConstQualified(),
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llvm::GlobalValue::InternalLinkage,
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C, ".compoundliteral", &CGM.getModule());
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return C;
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}
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case Expr::DeclRefExprClass:
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case Expr::QualifiedDeclRefExprClass: {
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NamedDecl *Decl = cast<DeclRefExpr>(E)->getDecl();
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if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl))
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return CGM.GetAddrOfFunction(FD);
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if (const VarDecl* VD = dyn_cast<VarDecl>(Decl)) {
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// We can never refer to a variable with local storage.
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if (!VD->hasLocalStorage()) {
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if (VD->isFileVarDecl() || VD->hasExternalStorage())
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return CGM.GetAddrOfGlobalVar(VD);
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else if (VD->isBlockVarDecl()) {
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assert(CGF && "Can't access static local vars without CGF");
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return CGF->GetAddrOfStaticLocalVar(VD);
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}
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}
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}
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break;
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}
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case Expr::StringLiteralClass:
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return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E));
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case Expr::ObjCEncodeExprClass:
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return CGM.GetAddrOfConstantStringFromObjCEncode(cast<ObjCEncodeExpr>(E));
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case Expr::ObjCStringLiteralClass: {
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ObjCStringLiteral* SL = cast<ObjCStringLiteral>(E);
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std::string S(SL->getString()->getStrData(),
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SL->getString()->getByteLength());
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llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(S);
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return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
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}
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case Expr::PredefinedExprClass: {
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// __func__/__FUNCTION__ -> "". __PRETTY_FUNCTION__ -> "top level".
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std::string Str;
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if (cast<PredefinedExpr>(E)->getIdentType() ==
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PredefinedExpr::PrettyFunction)
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Str = "top level";
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return CGM.GetAddrOfConstantCString(Str, ".tmp");
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}
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case Expr::AddrLabelExprClass: {
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assert(CGF && "Invalid address of label expression outside function.");
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unsigned id = CGF->GetIDForAddrOfLabel(cast<AddrLabelExpr>(E)->getLabel());
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llvm::Constant *C = llvm::ConstantInt::get(llvm::Type::Int32Ty, id);
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return llvm::ConstantExpr::getIntToPtr(C, ConvertType(E->getType()));
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}
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case Expr::CallExprClass: {
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CallExpr* CE = cast<CallExpr>(E);
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if (CE->isBuiltinCall(CGM.getContext()) !=
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Builtin::BI__builtin___CFStringMakeConstantString)
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break;
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const Expr *Arg = CE->getArg(0)->IgnoreParenCasts();
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const StringLiteral *Literal = cast<StringLiteral>(Arg);
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std::string S(Literal->getStrData(), Literal->getByteLength());
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return CGM.GetAddrOfConstantCFString(S);
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}
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case Expr::BlockExprClass: {
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std::string FunctionName;
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if (CGF)
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FunctionName = CGF->CurFn->getName();
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else
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FunctionName = "global";
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return CGM.GetAddrOfGlobalBlock(cast<BlockExpr>(E), FunctionName.c_str());
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}
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}
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return 0;
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}
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};
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} // end anonymous namespace.
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llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E,
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CodeGenFunction *CGF) {
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Expr::EvalResult Result;
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if (E->Evaluate(Result, Context)) {
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assert(!Result.HasSideEffects &&
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"Constant expr should not have any side effects!");
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switch (Result.Val.getKind()) {
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case APValue::Uninitialized:
|
|
assert(0 && "Constant expressions should be initialized.");
|
|
return 0;
|
|
case APValue::LValue: {
|
|
const llvm::Type *DestType = getTypes().ConvertTypeForMem(E->getType());
|
|
llvm::Constant *Offset =
|
|
llvm::ConstantInt::get(llvm::Type::Int64Ty,
|
|
Result.Val.getLValueOffset());
|
|
|
|
llvm::Constant *C;
|
|
if (const Expr *LVBase = Result.Val.getLValueBase()) {
|
|
C = ConstExprEmitter(*this, CGF).EmitLValue(const_cast<Expr*>(LVBase));
|
|
|
|
// Apply offset if necessary.
|
|
if (!Offset->isNullValue()) {
|
|
const llvm::Type *Type =
|
|
llvm::PointerType::getUnqual(llvm::Type::Int8Ty);
|
|
llvm::Constant *Casted = llvm::ConstantExpr::getBitCast(C, Type);
|
|
Casted = llvm::ConstantExpr::getGetElementPtr(Casted, &Offset, 1);
|
|
C = llvm::ConstantExpr::getBitCast(Casted, C->getType());
|
|
}
|
|
|
|
// Convert to the appropriate type; this could be an lvalue for
|
|
// an integer.
|
|
if (isa<llvm::PointerType>(DestType))
|
|
return llvm::ConstantExpr::getBitCast(C, DestType);
|
|
|
|
return llvm::ConstantExpr::getPtrToInt(C, DestType);
|
|
} else {
|
|
C = Offset;
|
|
|
|
// Convert to the appropriate type; this could be an lvalue for
|
|
// an integer.
|
|
if (isa<llvm::PointerType>(DestType))
|
|
return llvm::ConstantExpr::getIntToPtr(C, DestType);
|
|
|
|
// If the types don't match this should only be a truncate.
|
|
if (C->getType() != DestType)
|
|
return llvm::ConstantExpr::getTrunc(C, DestType);
|
|
|
|
return C;
|
|
}
|
|
}
|
|
case APValue::Int: {
|
|
llvm::Constant *C = llvm::ConstantInt::get(Result.Val.getInt());
|
|
|
|
if (C->getType() == llvm::Type::Int1Ty) {
|
|
const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType());
|
|
C = llvm::ConstantExpr::getZExt(C, BoolTy);
|
|
}
|
|
return C;
|
|
}
|
|
case APValue::ComplexInt: {
|
|
llvm::Constant *Complex[2];
|
|
|
|
Complex[0] = llvm::ConstantInt::get(Result.Val.getComplexIntReal());
|
|
Complex[1] = llvm::ConstantInt::get(Result.Val.getComplexIntImag());
|
|
|
|
return llvm::ConstantStruct::get(Complex, 2);
|
|
}
|
|
case APValue::Float:
|
|
return llvm::ConstantFP::get(Result.Val.getFloat());
|
|
case APValue::ComplexFloat: {
|
|
llvm::Constant *Complex[2];
|
|
|
|
Complex[0] = llvm::ConstantFP::get(Result.Val.getComplexFloatReal());
|
|
Complex[1] = llvm::ConstantFP::get(Result.Val.getComplexFloatImag());
|
|
|
|
return llvm::ConstantStruct::get(Complex, 2);
|
|
}
|
|
case APValue::Vector: {
|
|
llvm::SmallVector<llvm::Constant *, 4> Inits;
|
|
unsigned NumElts = Result.Val.getVectorLength();
|
|
|
|
for (unsigned i = 0; i != NumElts; ++i) {
|
|
APValue &Elt = Result.Val.getVectorElt(i);
|
|
if (Elt.isInt())
|
|
Inits.push_back(llvm::ConstantInt::get(Elt.getInt()));
|
|
else
|
|
Inits.push_back(llvm::ConstantFP::get(Elt.getFloat()));
|
|
}
|
|
return llvm::ConstantVector::get(&Inits[0], Inits.size());
|
|
}
|
|
}
|
|
}
|
|
|
|
llvm::Constant* C = ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E));
|
|
if (C && C->getType() == llvm::Type::Int1Ty) {
|
|
const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType());
|
|
C = llvm::ConstantExpr::getZExt(C, BoolTy);
|
|
}
|
|
return C;
|
|
}
|