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625 lines
24 KiB
625 lines
24 KiB
//===--- 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 "CGOpenMPRuntime.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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#include "llvm/Support/Path.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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ConstantAddress 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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QualType type = D.getType();
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LValue lv = CGF.MakeAddrLValue(DeclPtr, type);
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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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ConstantAddress 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, if they have the right signature.
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// Under some ABIs, destructors return this instead of void, and cannot be
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// passed directly to __cxa_atexit if the target does not allow this mismatch.
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const CXXRecordDecl *Record = type->getAsCXXRecordDecl();
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bool CanRegisterDestructor =
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Record && (!CGM.getCXXABI().HasThisReturn(
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GlobalDecl(Record->getDestructor(), Dtor_Complete)) ||
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CGM.getCXXABI().canCallMismatchedFunctionType());
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// If __cxa_atexit is disabled via a flag, a different helper function is
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// generated elsewhere which uses atexit instead, and it takes the destructor
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// directly.
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bool UsingExternalHelper = !CGM.getCodeGenOpts().CXAAtExit;
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if (Record && (CanRegisterDestructor || UsingExternalHelper)) {
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assert(!Record->hasTrivialDestructor());
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CXXDestructorDecl *dtor = Record->getDestructor();
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function = CGM.getAddrOfCXXStructor(dtor, StructorType::Complete);
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argument = llvm::ConstantExpr::getBitCast(
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addr.getPointer(), 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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// The address space of a static local variable (DeclPtr) may be different
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// from the address space of the "this" argument of the constructor. In that
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// case, we need an addrspacecast before calling the constructor.
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//
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// struct StructWithCtor {
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// __device__ StructWithCtor() {...}
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// };
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// __device__ void foo() {
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// __shared__ StructWithCtor s;
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// ...
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// }
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//
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// For example, in the above CUDA code, the static local variable s has a
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// "shared" address space qualifier, but the constructor of StructWithCtor
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// expects "this" in the "generic" address space.
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unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(T);
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unsigned ActualAddrSpace = DeclPtr->getType()->getPointerAddressSpace();
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if (ActualAddrSpace != ExpectedAddrSpace) {
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llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(T);
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llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace);
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DeclPtr = llvm::ConstantExpr::getAddrSpaceCast(DeclPtr, PTy);
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}
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ConstantAddress DeclAddr(DeclPtr, getContext().getDeclAlign(&D));
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if (!T->isReferenceType()) {
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if (getLangOpts().OpenMP && D.hasAttr<OMPThreadPrivateDeclAttr>())
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(void)CGM.getOpenMPRuntime().emitThreadPrivateVarDefinition(
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&D, DeclAddr, D.getAttr<OMPThreadPrivateDeclAttr>()->getLocation(),
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PerformInit, this);
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if (PerformInit)
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EmitDeclInit(*this, D, DeclAddr);
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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, DeclAddr);
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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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RValue RV = EmitReferenceBindingToExpr(Init);
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EmitStoreOfScalar(RV.getScalarVal(), DeclAddr, false, T);
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}
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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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llvm::Constant *CodeGenFunction::createAtExitStub(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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const CGFunctionInfo &FI = CGM.getTypes().arrangeNullaryFunction();
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llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(ty, FnName.str(),
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FI,
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VD.getLocation());
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CodeGenFunction CGF(CGM);
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CGF.StartFunction(&VD, CGM.getContext().VoidTy, fn, FI, FunctionArgList());
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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(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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llvm::Function *CodeGenModule::CreateGlobalInitOrDestructFunction(
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llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
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SourceLocation Loc, 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, &getModule());
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if (!getLangOpts().AppleKext && !TLS) {
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// Set the section if needed.
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if (const char *Section = getTarget().getStaticInitSectionSpecifier())
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Fn->setSection(Section);
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}
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SetInternalFunctionAttributes(nullptr, Fn, FI);
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Fn->setCallingConv(getRuntimeCC());
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if (!getLangOpts().Exceptions)
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Fn->setDoesNotThrow();
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if (!isInSanitizerBlacklist(Fn, Loc)) {
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if (getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
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SanitizerKind::KernelAddress))
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Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
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if (getLangOpts().Sanitize.has(SanitizerKind::Thread))
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Fn->addFnAttr(llvm::Attribute::SanitizeThread);
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if (getLangOpts().Sanitize.has(SanitizerKind::Memory))
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Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
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if (getLangOpts().Sanitize.has(SanitizerKind::SafeStack))
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Fn->addFnAttr(llvm::Attribute::SafeStack);
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}
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return Fn;
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}
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/// Create a global pointer to a function that will initialize a global
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/// variable. The user has requested that this pointer be emitted in a specific
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/// section.
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void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,
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llvm::GlobalVariable *GV,
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llvm::Function *InitFunc,
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InitSegAttr *ISA) {
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llvm::GlobalVariable *PtrArray = new llvm::GlobalVariable(
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TheModule, InitFunc->getType(), /*isConstant=*/true,
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llvm::GlobalValue::PrivateLinkage, InitFunc, "__cxx_init_fn_ptr");
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PtrArray->setSection(ISA->getSection());
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addUsedGlobal(PtrArray);
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// If the GV is already in a comdat group, then we have to join it.
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if (llvm::Comdat *C = GV->getComdat())
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PtrArray->setComdat(C);
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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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// According to E.2.3.1 in CUDA-7.5 Programming guide: __device__,
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// __constant__ and __shared__ variables defined in namespace scope,
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// that are of class type, cannot have a non-empty constructor. All
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// the checks have been done in Sema by now. Whatever initializers
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// are allowed are empty and we just need to ignore them here.
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if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
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(D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
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D->hasAttr<CUDASharedAttr>()))
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return;
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// Check if we've already initialized this decl.
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auto I = DelayedCXXInitPosition.find(D);
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if (I != DelayedCXXInitPosition.end() && I->second == ~0U)
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return;
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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(FTy, FnName.str(),
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getTypes().arrangeNullaryFunction(),
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D->getLocation());
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auto *ISA = D->getAttr<InitSegAttr>();
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CodeGenFunction(*this).GenerateCXXGlobalVarDeclInitFunc(Fn, D, Addr,
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PerformInit);
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llvm::GlobalVariable *COMDATKey =
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supportsCOMDAT() && D->isExternallyVisible() ? Addr : nullptr;
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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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CXXThreadLocalInitVars.push_back(D);
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} else if (PerformInit && ISA) {
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EmitPointerToInitFunc(D, Addr, Fn, ISA);
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} else if (auto *IPA = D->getAttr<InitPriorityAttr>()) {
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OrderGlobalInits Key(IPA->getPriority(), PrioritizedCXXGlobalInits.size());
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PrioritizedCXXGlobalInits.push_back(std::make_pair(Key, Fn));
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} else if (isTemplateInstantiation(D->getTemplateSpecializationKind())) {
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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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//
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// If the global is externally visible, put the initializer into a COMDAT
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// group with the global being initialized. On most platforms, this is a
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// minor startup time optimization. In the MS C++ ABI, there are no guard
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// variables, so this COMDAT key is required for correctness.
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AddGlobalCtor(Fn, 65535, COMDATKey);
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} else if (D->hasAttr<SelectAnyAttr>()) {
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// SelectAny globals will be comdat-folded. Put the initializer into a
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// COMDAT group associated with the global, so the initializers get folded
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// too.
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AddGlobalCtor(Fn, 65535, COMDATKey);
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} else {
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I = DelayedCXXInitPosition.find(D); // Re-do lookup in case of re-hash.
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if (I == DelayedCXXInitPosition.end()) {
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CXXGlobalInits.push_back(Fn);
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} else if (I->second != ~0U) {
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assert(I->second < CXXGlobalInits.size() &&
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CXXGlobalInits[I->second] == nullptr);
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CXXGlobalInits[I->second] = Fn;
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}
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}
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// Remember that we already emitted the initializer for this global.
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DelayedCXXInitPosition[D] = ~0U;
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}
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void CodeGenModule::EmitCXXThreadLocalInitFunc() {
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getCXXABI().EmitThreadLocalInitFuncs(
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*this, CXXThreadLocals, CXXThreadLocalInits, CXXThreadLocalInitVars);
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CXXThreadLocalInits.clear();
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CXXThreadLocalInitVars.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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const CGFunctionInfo &FI = getTypes().arrangeNullaryFunction();
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// Create our global initialization function.
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if (!PrioritizedCXXGlobalInits.empty()) {
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SmallVector<llvm::Function *, 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 = CreateGlobalInitOrDestructFunction(
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FTy, "_GLOBAL__I_" + PrioritySuffix, FI);
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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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PrioritizedCXXGlobalInits.clear();
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}
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SmallString<128> FileName;
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SourceManager &SM = Context.getSourceManager();
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if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
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// Include the filename in the symbol name. Including "sub_" matches gcc and
|
|
// makes sure these symbols appear lexicographically behind the symbols with
|
|
// priority emitted above.
|
|
FileName = llvm::sys::path::filename(MainFile->getName());
|
|
} else {
|
|
FileName = "<null>";
|
|
}
|
|
|
|
for (size_t i = 0; i < FileName.size(); ++i) {
|
|
// Replace everything that's not [a-zA-Z0-9._] with a _. This set happens
|
|
// to be the set of C preprocessing numbers.
|
|
if (!isPreprocessingNumberBody(FileName[i]))
|
|
FileName[i] = '_';
|
|
}
|
|
|
|
llvm::Function *Fn = CreateGlobalInitOrDestructFunction(
|
|
FTy, llvm::Twine("_GLOBAL__sub_I_", FileName), FI);
|
|
|
|
CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, CXXGlobalInits);
|
|
AddGlobalCtor(Fn);
|
|
|
|
CXXGlobalInits.clear();
|
|
}
|
|
|
|
void CodeGenModule::EmitCXXGlobalDtorFunc() {
|
|
if (CXXGlobalDtors.empty())
|
|
return;
|
|
|
|
llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
|
|
|
|
// Create our global destructor function.
|
|
const CGFunctionInfo &FI = getTypes().arrangeNullaryFunction();
|
|
llvm::Function *Fn =
|
|
CreateGlobalInitOrDestructFunction(FTy, "_GLOBAL__D_a", FI);
|
|
|
|
CodeGenFunction(*this).GenerateCXXGlobalDtorsFunc(Fn, CXXGlobalDtors);
|
|
AddGlobalDtor(Fn);
|
|
}
|
|
|
|
/// Emit the code necessary to initialize the given global variable.
|
|
void CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
|
|
const VarDecl *D,
|
|
llvm::GlobalVariable *Addr,
|
|
bool PerformInit) {
|
|
// Check if we need to emit debug info for variable initializer.
|
|
if (D->hasAttr<NoDebugAttr>())
|
|
DebugInfo = nullptr; // disable debug info indefinitely for this function
|
|
|
|
CurEHLocation = D->getLocStart();
|
|
|
|
StartFunction(GlobalDecl(D), getContext().VoidTy, Fn,
|
|
getTypes().arrangeNullaryFunction(),
|
|
FunctionArgList(), D->getLocation(),
|
|
D->getInit()->getExprLoc());
|
|
|
|
// Use guarded initialization if the global variable is weak. This
|
|
// occurs for, e.g., instantiated static data members and
|
|
// definitions explicitly marked weak.
|
|
if (Addr->hasWeakLinkage() || Addr->hasLinkOnceLinkage()) {
|
|
EmitCXXGuardedInit(*D, Addr, PerformInit);
|
|
} else {
|
|
EmitCXXGlobalVarDeclInit(*D, Addr, PerformInit);
|
|
}
|
|
|
|
FinishFunction();
|
|
}
|
|
|
|
void
|
|
CodeGenFunction::GenerateCXXGlobalInitFunc(llvm::Function *Fn,
|
|
ArrayRef<llvm::Function *> Decls,
|
|
Address Guard) {
|
|
{
|
|
auto NL = ApplyDebugLocation::CreateEmpty(*this);
|
|
StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
|
|
getTypes().arrangeNullaryFunction(), FunctionArgList());
|
|
// Emit an artificial location for this function.
|
|
auto AL = ApplyDebugLocation::CreateArtificial(*this);
|
|
|
|
llvm::BasicBlock *ExitBlock = nullptr;
|
|
if (Guard.isValid()) {
|
|
// If we have a guard variable, check whether we've already performed
|
|
// these initializations. This happens for TLS initialization functions.
|
|
llvm::Value *GuardVal = Builder.CreateLoad(Guard);
|
|
llvm::Value *Uninit = Builder.CreateIsNull(GuardVal,
|
|
"guard.uninitialized");
|
|
llvm::BasicBlock *InitBlock = createBasicBlock("init");
|
|
ExitBlock = createBasicBlock("exit");
|
|
Builder.CreateCondBr(Uninit, InitBlock, ExitBlock);
|
|
EmitBlock(InitBlock);
|
|
// Mark as initialized before initializing anything else. If the
|
|
// initializers use previously-initialized thread_local vars, that's
|
|
// probably supposed to be OK, but the standard doesn't say.
|
|
Builder.CreateStore(llvm::ConstantInt::get(GuardVal->getType(),1), Guard);
|
|
}
|
|
|
|
RunCleanupsScope Scope(*this);
|
|
|
|
// When building in Objective-C++ ARC mode, create an autorelease pool
|
|
// around the global initializers.
|
|
if (getLangOpts().ObjCAutoRefCount && getLangOpts().CPlusPlus) {
|
|
llvm::Value *token = EmitObjCAutoreleasePoolPush();
|
|
EmitObjCAutoreleasePoolCleanup(token);
|
|
}
|
|
|
|
for (unsigned i = 0, e = Decls.size(); i != e; ++i)
|
|
if (Decls[i])
|
|
EmitRuntimeCall(Decls[i]);
|
|
|
|
Scope.ForceCleanup();
|
|
|
|
if (ExitBlock) {
|
|
Builder.CreateBr(ExitBlock);
|
|
EmitBlock(ExitBlock);
|
|
}
|
|
}
|
|
|
|
FinishFunction();
|
|
}
|
|
|
|
void CodeGenFunction::GenerateCXXGlobalDtorsFunc(llvm::Function *Fn,
|
|
const std::vector<std::pair<llvm::WeakVH, llvm::Constant*> >
|
|
&DtorsAndObjects) {
|
|
{
|
|
auto NL = ApplyDebugLocation::CreateEmpty(*this);
|
|
StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
|
|
getTypes().arrangeNullaryFunction(), FunctionArgList());
|
|
// Emit an artificial location for this function.
|
|
auto AL = ApplyDebugLocation::CreateArtificial(*this);
|
|
|
|
// 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. The address of the object
|
|
/// should be in global memory.
|
|
llvm::Function *CodeGenFunction::generateDestroyHelper(
|
|
Address addr, QualType type, Destroyer *destroyer,
|
|
bool useEHCleanupForArray, const VarDecl *VD) {
|
|
FunctionArgList args;
|
|
ImplicitParamDecl dst(getContext(), nullptr, SourceLocation(), nullptr,
|
|
getContext().VoidPtrTy);
|
|
args.push_back(&dst);
|
|
|
|
const CGFunctionInfo &FI =
|
|
CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, args);
|
|
llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
|
|
llvm::Function *fn = CGM.CreateGlobalInitOrDestructFunction(
|
|
FTy, "__cxx_global_array_dtor", FI, VD->getLocation());
|
|
|
|
CurEHLocation = VD->getLocStart();
|
|
|
|
StartFunction(VD, getContext().VoidTy, fn, FI, args);
|
|
|
|
emitDestroy(addr, type, destroyer, useEHCleanupForArray);
|
|
|
|
FinishFunction();
|
|
|
|
return fn;
|
|
}
|