forked from OSchip/llvm-project
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
//===--- CGTemporaries.cpp - Emit LLVM Code for C++ temporaries -----------===//
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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 dealing with C++ code generation of temporaries
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenFunction.h"
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using namespace clang;
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using namespace CodeGen;
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static void EmitTemporaryCleanup(CodeGenFunction &CGF,
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const CXXTemporary *Temporary,
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llvm::Value *Addr,
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llvm::Value *CondPtr) {
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llvm::BasicBlock *CondEnd = 0;
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// If this is a conditional temporary, we need to check the condition
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// boolean and only call the destructor if it's true.
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if (CondPtr) {
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llvm::BasicBlock *CondBlock = CGF.createBasicBlock("temp.cond-dtor.call");
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CondEnd = CGF.createBasicBlock("temp.cond-dtor.cont");
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llvm::Value *Cond = CGF.Builder.CreateLoad(CondPtr);
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CGF.Builder.CreateCondBr(Cond, CondBlock, CondEnd);
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CGF.EmitBlock(CondBlock);
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}
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CGF.EmitCXXDestructorCall(Temporary->getDestructor(),
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Dtor_Complete, /*ForVirtualBase=*/false,
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Addr);
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if (CondPtr) {
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// Reset the condition to false.
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CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(CGF.getLLVMContext()),
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CondPtr);
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CGF.EmitBlock(CondEnd);
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}
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}
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/// Emits all the code to cause the given temporary to be cleaned up.
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void CodeGenFunction::EmitCXXTemporary(const CXXTemporary *Temporary,
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llvm::Value *Ptr) {
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llvm::AllocaInst *CondPtr = 0;
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// Check if temporaries need to be conditional. If so, we'll create a
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// condition boolean, initialize it to 0 and
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if (ConditionalBranchLevel != 0) {
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CondPtr = CreateTempAlloca(llvm::Type::getInt1Ty(VMContext), "cond");
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// Initialize it to false. This initialization takes place right after
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// the alloca insert point.
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InitTempAlloca(CondPtr, llvm::ConstantInt::getFalse(VMContext));
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// Now set it to true.
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Builder.CreateStore(llvm::ConstantInt::getTrue(VMContext), CondPtr);
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}
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CleanupBlock Cleanup(*this, NormalCleanup);
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EmitTemporaryCleanup(*this, Temporary, Ptr, CondPtr);
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if (Exceptions) {
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Cleanup.beginEHCleanup();
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EmitTemporaryCleanup(*this, Temporary, Ptr, CondPtr);
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}
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}
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RValue
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CodeGenFunction::EmitCXXExprWithTemporaries(const CXXExprWithTemporaries *E,
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llvm::Value *AggLoc,
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bool IsAggLocVolatile,
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bool IsInitializer) {
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RValue RV;
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{
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RunCleanupsScope Scope(*this);
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RV = EmitAnyExpr(E->getSubExpr(), AggLoc, IsAggLocVolatile,
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/*IgnoreResult=*/false, IsInitializer);
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}
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return RV;
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}
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LValue CodeGenFunction::EmitCXXExprWithTemporariesLValue(
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const CXXExprWithTemporaries *E) {
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LValue LV;
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{
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RunCleanupsScope Scope(*this);
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LV = EmitLValue(E->getSubExpr());
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}
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return LV;
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}
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