522 lines
20 KiB
C++
522 lines
20 KiB
C++
//===--- CGDeclCXX.cpp - Emit LLVM Code for C++ declarations --------------===//
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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 code generation of C++ declarations
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenFunction.h"
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#include "CGCXXABI.h"
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#include "CGObjCRuntime.h"
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#include "clang/Frontend/CodeGenOptions.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/IR/Intrinsics.h"
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using namespace clang;
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using namespace CodeGen;
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static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D,
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llvm::Constant *DeclPtr) {
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assert(D.hasGlobalStorage() && "VarDecl must have global storage!");
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assert(!D.getType()->isReferenceType() &&
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"Should not call EmitDeclInit on a reference!");
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ASTContext &Context = CGF.getContext();
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CharUnits alignment = Context.getDeclAlign(&D);
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QualType type = D.getType();
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LValue lv = CGF.MakeAddrLValue(DeclPtr, type, alignment);
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const Expr *Init = D.getInit();
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switch (CGF.getEvaluationKind(type)) {
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case TEK_Scalar: {
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CodeGenModule &CGM = CGF.CGM;
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if (lv.isObjCStrong())
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CGM.getObjCRuntime().EmitObjCGlobalAssign(CGF, CGF.EmitScalarExpr(Init),
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DeclPtr, D.getTLSKind());
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else if (lv.isObjCWeak())
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CGM.getObjCRuntime().EmitObjCWeakAssign(CGF, CGF.EmitScalarExpr(Init),
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DeclPtr);
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else
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CGF.EmitScalarInit(Init, &D, lv, false);
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return;
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}
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case TEK_Complex:
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CGF.EmitComplexExprIntoLValue(Init, lv, /*isInit*/ true);
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return;
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case TEK_Aggregate:
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CGF.EmitAggExpr(Init, AggValueSlot::forLValue(lv,AggValueSlot::IsDestructed,
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AggValueSlot::DoesNotNeedGCBarriers,
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AggValueSlot::IsNotAliased));
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return;
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}
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llvm_unreachable("bad evaluation kind");
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}
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/// Emit code to cause the destruction of the given variable with
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/// static storage duration.
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static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D,
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llvm::Constant *addr) {
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CodeGenModule &CGM = CGF.CGM;
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// FIXME: __attribute__((cleanup)) ?
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QualType type = D.getType();
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QualType::DestructionKind dtorKind = type.isDestructedType();
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switch (dtorKind) {
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case QualType::DK_none:
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return;
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case QualType::DK_cxx_destructor:
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break;
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case QualType::DK_objc_strong_lifetime:
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case QualType::DK_objc_weak_lifetime:
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// We don't care about releasing objects during process teardown.
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assert(!D.getTLSKind() && "should have rejected this");
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return;
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}
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llvm::Constant *function;
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llvm::Constant *argument;
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// Special-case non-array C++ destructors, where there's a function
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// with the right signature that we can just call.
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const CXXRecordDecl *record = 0;
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if (dtorKind == QualType::DK_cxx_destructor &&
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(record = type->getAsCXXRecordDecl())) {
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assert(!record->hasTrivialDestructor());
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CXXDestructorDecl *dtor = record->getDestructor();
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function = CGM.GetAddrOfCXXDestructor(dtor, Dtor_Complete);
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argument = llvm::ConstantExpr::getBitCast(
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addr, CGF.getTypes().ConvertType(type)->getPointerTo());
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// Otherwise, the standard logic requires a helper function.
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} else {
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function = CodeGenFunction(CGM)
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.generateDestroyHelper(addr, type, CGF.getDestroyer(dtorKind),
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CGF.needsEHCleanup(dtorKind), &D);
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argument = llvm::Constant::getNullValue(CGF.Int8PtrTy);
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}
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CGM.getCXXABI().registerGlobalDtor(CGF, D, function, argument);
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}
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/// Emit code to cause the variable at the given address to be considered as
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/// constant from this point onwards.
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static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D,
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llvm::Constant *Addr) {
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// Don't emit the intrinsic if we're not optimizing.
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if (!CGF.CGM.getCodeGenOpts().OptimizationLevel)
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return;
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// Grab the llvm.invariant.start intrinsic.
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llvm::Intrinsic::ID InvStartID = llvm::Intrinsic::invariant_start;
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llvm::Constant *InvariantStart = CGF.CGM.getIntrinsic(InvStartID);
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// Emit a call with the size in bytes of the object.
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CharUnits WidthChars = CGF.getContext().getTypeSizeInChars(D.getType());
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uint64_t Width = WidthChars.getQuantity();
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llvm::Value *Args[2] = { llvm::ConstantInt::getSigned(CGF.Int64Ty, Width),
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llvm::ConstantExpr::getBitCast(Addr, CGF.Int8PtrTy)};
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CGF.Builder.CreateCall(InvariantStart, Args);
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}
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void CodeGenFunction::EmitCXXGlobalVarDeclInit(const VarDecl &D,
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llvm::Constant *DeclPtr,
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bool PerformInit) {
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const Expr *Init = D.getInit();
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QualType T = D.getType();
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if (!T->isReferenceType()) {
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if (PerformInit)
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EmitDeclInit(*this, D, DeclPtr);
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if (CGM.isTypeConstant(D.getType(), true))
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EmitDeclInvariant(*this, D, DeclPtr);
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else
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EmitDeclDestroy(*this, D, DeclPtr);
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return;
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}
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assert(PerformInit && "cannot have constant initializer which needs "
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"destruction for reference");
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unsigned Alignment = getContext().getDeclAlign(&D).getQuantity();
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RValue RV = EmitReferenceBindingToExpr(Init);
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EmitStoreOfScalar(RV.getScalarVal(), DeclPtr, false, Alignment, T);
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}
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static llvm::Function *
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CreateGlobalInitOrDestructFunction(CodeGenModule &CGM,
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llvm::FunctionType *ty,
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const Twine &name,
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bool TLS = false);
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/// Create a stub function, suitable for being passed to atexit,
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/// which passes the given address to the given destructor function.
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static llvm::Constant *createAtExitStub(CodeGenModule &CGM, const VarDecl &VD,
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llvm::Constant *dtor,
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llvm::Constant *addr) {
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// Get the destructor function type, void(*)(void).
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llvm::FunctionType *ty = llvm::FunctionType::get(CGM.VoidTy, false);
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SmallString<256> FnName;
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{
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llvm::raw_svector_ostream Out(FnName);
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CGM.getCXXABI().getMangleContext().mangleDynamicAtExitDestructor(&VD, Out);
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}
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llvm::Function *fn =
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CreateGlobalInitOrDestructFunction(CGM, ty, FnName.str());
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CodeGenFunction CGF(CGM);
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CGF.StartFunction(&VD, CGM.getContext().VoidTy, fn,
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CGM.getTypes().arrangeNullaryFunction(), FunctionArgList(),
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SourceLocation());
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llvm::CallInst *call = CGF.Builder.CreateCall(dtor, addr);
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// Make sure the call and the callee agree on calling convention.
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if (llvm::Function *dtorFn =
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dyn_cast<llvm::Function>(dtor->stripPointerCasts()))
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call->setCallingConv(dtorFn->getCallingConv());
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CGF.FinishFunction();
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return fn;
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}
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/// Register a global destructor using the C atexit runtime function.
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void CodeGenFunction::registerGlobalDtorWithAtExit(const VarDecl &VD,
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llvm::Constant *dtor,
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llvm::Constant *addr) {
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// Create a function which calls the destructor.
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llvm::Constant *dtorStub = createAtExitStub(CGM, VD, dtor, addr);
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// extern "C" int atexit(void (*f)(void));
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llvm::FunctionType *atexitTy =
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llvm::FunctionType::get(IntTy, dtorStub->getType(), false);
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llvm::Constant *atexit =
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CGM.CreateRuntimeFunction(atexitTy, "atexit");
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if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit))
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atexitFn->setDoesNotThrow();
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EmitNounwindRuntimeCall(atexit, dtorStub);
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}
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void CodeGenFunction::EmitCXXGuardedInit(const VarDecl &D,
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llvm::GlobalVariable *DeclPtr,
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bool PerformInit) {
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// If we've been asked to forbid guard variables, emit an error now.
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// This diagnostic is hard-coded for Darwin's use case; we can find
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// better phrasing if someone else needs it.
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if (CGM.getCodeGenOpts().ForbidGuardVariables)
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CGM.Error(D.getLocation(),
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"this initialization requires a guard variable, which "
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"the kernel does not support");
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CGM.getCXXABI().EmitGuardedInit(*this, D, DeclPtr, PerformInit);
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}
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static llvm::Function *
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CreateGlobalInitOrDestructFunction(CodeGenModule &CGM,
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llvm::FunctionType *FTy,
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const Twine &Name, bool TLS) {
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llvm::Function *Fn =
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llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage,
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Name, &CGM.getModule());
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if (!CGM.getLangOpts().AppleKext && !TLS) {
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// Set the section if needed.
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if (const char *Section =
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CGM.getTarget().getStaticInitSectionSpecifier())
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Fn->setSection(Section);
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}
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Fn->setCallingConv(CGM.getRuntimeCC());
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if (!CGM.getLangOpts().Exceptions)
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Fn->setDoesNotThrow();
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if (CGM.getSanOpts().Address)
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Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
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if (CGM.getSanOpts().Thread)
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Fn->addFnAttr(llvm::Attribute::SanitizeThread);
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if (CGM.getSanOpts().Memory)
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Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
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return Fn;
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}
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void
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CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
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llvm::GlobalVariable *Addr,
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bool PerformInit) {
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llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
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SmallString<256> FnName;
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{
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llvm::raw_svector_ostream Out(FnName);
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getCXXABI().getMangleContext().mangleDynamicInitializer(D, Out);
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}
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// Create a variable initialization function.
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llvm::Function *Fn =
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CreateGlobalInitOrDestructFunction(*this, FTy, FnName.str());
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CodeGenFunction(*this).GenerateCXXGlobalVarDeclInitFunc(Fn, D, Addr,
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PerformInit);
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if (D->getTLSKind()) {
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// FIXME: Should we support init_priority for thread_local?
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// FIXME: Ideally, initialization of instantiated thread_local static data
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// members of class templates should not trigger initialization of other
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// entities in the TU.
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// FIXME: We only need to register one __cxa_thread_atexit function for the
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// entire TU.
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CXXThreadLocalInits.push_back(Fn);
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} else if (D->hasAttr<InitPriorityAttr>()) {
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unsigned int order = D->getAttr<InitPriorityAttr>()->getPriority();
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OrderGlobalInits Key(order, PrioritizedCXXGlobalInits.size());
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PrioritizedCXXGlobalInits.push_back(std::make_pair(Key, Fn));
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DelayedCXXInitPosition.erase(D);
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} else if (D->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
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D->getTemplateSpecializationKind() != TSK_Undeclared) {
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// C++ [basic.start.init]p2:
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// Definitions of explicitly specialized class template static data
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// members have ordered initialization. Other class template static data
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// members (i.e., implicitly or explicitly instantiated specializations)
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// have unordered initialization.
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//
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// As a consequence, we can put them into their own llvm.global_ctors entry.
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// This should allow GlobalOpt to fire more often, and allow us to implement
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// the Microsoft C++ ABI, which uses COMDAT elimination to avoid double
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// initializaiton.
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AddGlobalCtor(Fn);
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DelayedCXXInitPosition.erase(D);
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} else {
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llvm::DenseMap<const Decl *, unsigned>::iterator I =
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DelayedCXXInitPosition.find(D);
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if (I == DelayedCXXInitPosition.end()) {
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CXXGlobalInits.push_back(Fn);
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} else {
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assert(CXXGlobalInits[I->second] == 0);
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CXXGlobalInits[I->second] = Fn;
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DelayedCXXInitPosition.erase(I);
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}
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}
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}
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void CodeGenModule::EmitCXXThreadLocalInitFunc() {
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llvm::Function *InitFn = 0;
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if (!CXXThreadLocalInits.empty()) {
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// Generate a guarded initialization function.
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llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
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InitFn = CreateGlobalInitOrDestructFunction(*this, FTy, "__tls_init",
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/*TLS*/ true);
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llvm::GlobalVariable *Guard = new llvm::GlobalVariable(
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getModule(), Int8Ty, false, llvm::GlobalVariable::InternalLinkage,
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llvm::ConstantInt::get(Int8Ty, 0), "__tls_guard");
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Guard->setThreadLocal(true);
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CodeGenFunction(*this)
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.GenerateCXXGlobalInitFunc(InitFn, CXXThreadLocalInits, Guard);
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}
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getCXXABI().EmitThreadLocalInitFuncs(CXXThreadLocals, InitFn);
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CXXThreadLocalInits.clear();
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CXXThreadLocals.clear();
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}
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void
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CodeGenModule::EmitCXXGlobalInitFunc() {
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while (!CXXGlobalInits.empty() && !CXXGlobalInits.back())
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CXXGlobalInits.pop_back();
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if (CXXGlobalInits.empty() && PrioritizedCXXGlobalInits.empty())
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return;
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llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
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// Create our global initialization function.
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if (!PrioritizedCXXGlobalInits.empty()) {
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SmallVector<llvm::Constant*, 8> LocalCXXGlobalInits;
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llvm::array_pod_sort(PrioritizedCXXGlobalInits.begin(),
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PrioritizedCXXGlobalInits.end());
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// Iterate over "chunks" of ctors with same priority and emit each chunk
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// into separate function. Note - everything is sorted first by priority,
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// second - by lex order, so we emit ctor functions in proper order.
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for (SmallVectorImpl<GlobalInitData >::iterator
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I = PrioritizedCXXGlobalInits.begin(),
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E = PrioritizedCXXGlobalInits.end(); I != E; ) {
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SmallVectorImpl<GlobalInitData >::iterator
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PrioE = std::upper_bound(I + 1, E, *I, GlobalInitPriorityCmp());
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LocalCXXGlobalInits.clear();
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unsigned Priority = I->first.priority;
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// Compute the function suffix from priority. Prepend with zeroes to make
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// sure the function names are also ordered as priorities.
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std::string PrioritySuffix = llvm::utostr(Priority);
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// Priority is always <= 65535 (enforced by sema)..
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PrioritySuffix = std::string(6-PrioritySuffix.size(), '0')+PrioritySuffix;
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llvm::Function *Fn =
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CreateGlobalInitOrDestructFunction(*this, FTy,
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"_GLOBAL__I_" + PrioritySuffix);
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for (; I < PrioE; ++I)
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LocalCXXGlobalInits.push_back(I->second);
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CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, LocalCXXGlobalInits);
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AddGlobalCtor(Fn, Priority);
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}
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}
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llvm::Function *Fn =
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CreateGlobalInitOrDestructFunction(*this, FTy, "_GLOBAL__I_a");
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CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, CXXGlobalInits);
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AddGlobalCtor(Fn);
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CXXGlobalInits.clear();
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PrioritizedCXXGlobalInits.clear();
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}
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void CodeGenModule::EmitCXXGlobalDtorFunc() {
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if (CXXGlobalDtors.empty())
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return;
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llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
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// Create our global destructor function.
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llvm::Function *Fn =
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CreateGlobalInitOrDestructFunction(*this, FTy, "_GLOBAL__D_a");
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CodeGenFunction(*this).GenerateCXXGlobalDtorsFunc(Fn, CXXGlobalDtors);
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AddGlobalDtor(Fn);
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}
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/// Emit the code necessary to initialize the given global variable.
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void CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
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const VarDecl *D,
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llvm::GlobalVariable *Addr,
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bool PerformInit) {
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// Check if we need to emit debug info for variable initializer.
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if (D->hasAttr<NoDebugAttr>())
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DebugInfo = NULL; // disable debug info indefinitely for this function
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StartFunction(GlobalDecl(D), getContext().VoidTy, Fn,
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getTypes().arrangeNullaryFunction(),
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FunctionArgList(), D->getInit()->getExprLoc());
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// Use guarded initialization if the global variable is weak. This
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// occurs for, e.g., instantiated static data members and
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// definitions explicitly marked weak.
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if (Addr->getLinkage() == llvm::GlobalValue::WeakODRLinkage ||
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Addr->getLinkage() == llvm::GlobalValue::WeakAnyLinkage) {
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EmitCXXGuardedInit(*D, Addr, PerformInit);
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} else {
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EmitCXXGlobalVarDeclInit(*D, Addr, PerformInit);
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}
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FinishFunction();
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}
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void
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CodeGenFunction::GenerateCXXGlobalInitFunc(llvm::Function *Fn,
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ArrayRef<llvm::Constant *> Decls,
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llvm::GlobalVariable *Guard) {
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StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
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getTypes().arrangeNullaryFunction(),
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FunctionArgList(), SourceLocation());
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llvm::BasicBlock *ExitBlock = 0;
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if (Guard) {
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// If we have a guard variable, check whether we've already performed these
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// initializations. This happens for TLS initialization functions.
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llvm::Value *GuardVal = Builder.CreateLoad(Guard);
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llvm::Value *Uninit = Builder.CreateIsNull(GuardVal, "guard.uninitialized");
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// Mark as initialized before initializing anything else. If the
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// initializers use previously-initialized thread_local vars, that's
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// probably supposed to be OK, but the standard doesn't say.
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Builder.CreateStore(llvm::ConstantInt::get(GuardVal->getType(), 1), Guard);
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llvm::BasicBlock *InitBlock = createBasicBlock("init");
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ExitBlock = createBasicBlock("exit");
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Builder.CreateCondBr(Uninit, InitBlock, ExitBlock);
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EmitBlock(InitBlock);
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}
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RunCleanupsScope Scope(*this);
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// When building in Objective-C++ ARC mode, create an autorelease pool
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// around the global initializers.
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if (getLangOpts().ObjCAutoRefCount && getLangOpts().CPlusPlus) {
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llvm::Value *token = EmitObjCAutoreleasePoolPush();
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EmitObjCAutoreleasePoolCleanup(token);
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}
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for (unsigned i = 0, e = Decls.size(); i != e; ++i)
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if (Decls[i])
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EmitRuntimeCall(Decls[i]);
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Scope.ForceCleanup();
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if (ExitBlock) {
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Builder.CreateBr(ExitBlock);
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EmitBlock(ExitBlock);
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}
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FinishFunction();
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}
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void CodeGenFunction::GenerateCXXGlobalDtorsFunc(llvm::Function *Fn,
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const std::vector<std::pair<llvm::WeakVH, llvm::Constant*> >
|
|
&DtorsAndObjects) {
|
|
StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
|
|
getTypes().arrangeNullaryFunction(),
|
|
FunctionArgList(), SourceLocation());
|
|
|
|
// Emit the dtors, in reverse order from construction.
|
|
for (unsigned i = 0, e = DtorsAndObjects.size(); i != e; ++i) {
|
|
llvm::Value *Callee = DtorsAndObjects[e - i - 1].first;
|
|
llvm::CallInst *CI = Builder.CreateCall(Callee,
|
|
DtorsAndObjects[e - i - 1].second);
|
|
// Make sure the call and the callee agree on calling convention.
|
|
if (llvm::Function *F = dyn_cast<llvm::Function>(Callee))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
}
|
|
|
|
FinishFunction();
|
|
}
|
|
|
|
/// generateDestroyHelper - Generates a helper function which, when
|
|
/// invoked, destroys the given object.
|
|
llvm::Function *CodeGenFunction::generateDestroyHelper(
|
|
llvm::Constant *addr, QualType type, Destroyer *destroyer,
|
|
bool useEHCleanupForArray, const VarDecl *VD) {
|
|
FunctionArgList args;
|
|
ImplicitParamDecl dst(0, SourceLocation(), 0, getContext().VoidPtrTy);
|
|
args.push_back(&dst);
|
|
|
|
const CGFunctionInfo &FI =
|
|
CGM.getTypes().arrangeFunctionDeclaration(getContext().VoidTy, args,
|
|
FunctionType::ExtInfo(),
|
|
/*variadic*/ false);
|
|
llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
|
|
llvm::Function *fn =
|
|
CreateGlobalInitOrDestructFunction(CGM, FTy, "__cxx_global_array_dtor");
|
|
|
|
StartFunction(VD, getContext().VoidTy, fn, FI, args, SourceLocation());
|
|
|
|
emitDestroy(addr, type, destroyer, useEHCleanupForArray);
|
|
|
|
FinishFunction();
|
|
|
|
return fn;
|
|
}
|