зеркало из https://github.com/microsoft/clang-1.git
Add preliminary (and probably broken) codegen support for C++ static initializers.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55180 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anders Carlsson
Родитель
4bd8217d94
Коммит
e1b29efab3
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@ -12,6 +12,7 @@
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@ -263,6 +264,7 @@
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@ -357,7 +359,7 @@
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@ -392,7 +394,7 @@
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@ -412,8 +414,8 @@
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@ -450,7 +452,7 @@
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@ -465,13 +467,13 @@
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||||
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||||
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@ -791,7 +793,6 @@
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DE927FCC0C0557CD00231DA4 /* CodeGen */ = {
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isa = PBXGroup;
|
||||
children = (
|
||||
3552E7580E520DD7003A8CA5 /* CGObjCMac.cpp */,
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||||
DE928B800C0A615B00231DA4 /* CodeGenFunction.h */,
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||||
DE928B820C0A616000231DA4 /* CodeGenFunction.cpp */,
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DE928B7C0C0A615100231DA4 /* CodeGenModule.h */,
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@ -799,6 +800,7 @@
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DEEBC3BB0C2363BC00A9FE82 /* CodeGenTypes.cpp */,
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DEEBC3B90C2363B800A9FE82 /* CodeGenTypes.h */,
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1ABC36930C7A4BDC006DB0AB /* CGBuiltin.cpp */,
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DE4264FB0C113592005A861D /* CGDecl.cpp */,
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@ -810,6 +812,7 @@
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1A7342470C7B57D500122F56 /* CGObjC.cpp */,
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DE38CD4E0D794CF900A273B6 /* CGObjCRuntime.h */,
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DE38CD4F0D794D0100A273B6 /* CGObjCGNU.cpp */,
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3552E7580E520DD7003A8CA5 /* CGObjCMac.cpp */,
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DE4772F90C10EAE5002239E8 /* CGStmt.cpp */,
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DE928B120C05659200231DA4 /* ModuleBuilder.cpp */,
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);
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@ -1201,6 +1204,7 @@
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3552E7550E520D80003A8CA5 /* PPCaching.cpp in Sources */,
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||||
3552E7590E520DD7003A8CA5 /* CGObjCMac.cpp in Sources */,
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||||
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1A5D5E580E5E81010023C059 /* CGCXX.cpp in Sources */,
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);
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runOnlyForDeploymentPostprocessing = 0;
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};
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@ -46,6 +46,8 @@ struct LangOptions {
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unsigned NeXTRuntime : 1; // Use NeXT runtime.
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unsigned ThreadsafeStatics : 1; // Whether static initializers are protected
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// by lockis.
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private:
|
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unsigned GC : 2; // Objective-C Garbage Collection modes. We declare
|
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// this enum as unsigned because MSVC insists on making enums
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@ -60,7 +62,10 @@ public:
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GC = ObjC1 = ObjC2 = 0;
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||||
C99 = Microsoft = CPlusPlus = CPlusPlus0x = NoExtensions = 0;
|
||||
CXXOperatorNames = PascalStrings = Boolean = WritableStrings = 0;
|
||||
LaxVectorConversions = Exceptions = NeXTRuntime = 0;
|
||||
LaxVectorConversions = Exceptions = NeXTRuntime = 0;
|
||||
|
||||
// FIXME: The default should be 1.
|
||||
ThreadsafeStatics = 0;
|
||||
}
|
||||
|
||||
GCMode getGCMode() const { return (GCMode) GC; }
|
||||
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@ -0,0 +1,136 @@
|
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//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file is distributed under the University of Illinois Open Source
|
||||
// License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This contains code dealing with C++ code generation.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
// We might split this into multiple files if it gets too unwieldy
|
||||
|
||||
#include "CodeGenFunction.h"
|
||||
#include "CodeGenModule.h"
|
||||
#include "clang/AST/ASTContext.h"
|
||||
#include "clang/AST/Decl.h"
|
||||
#include "llvm/ADT/StringExtras.h"
|
||||
|
||||
using namespace clang;
|
||||
using namespace CodeGen;
|
||||
|
||||
using llvm::utostr;
|
||||
|
||||
|
||||
// FIXME: Name mangling should be moved to a separate class.
|
||||
|
||||
static void mangleDeclContextInternal(const DeclContext *D, std::string &S)
|
||||
{
|
||||
assert(isa<TranslationUnitDecl>(D->getParent()) &&
|
||||
"Only one level of decl context mangling is currently supported!");
|
||||
|
||||
if (FunctionDecl* FD = dyn_cast<FunctionDecl>(D)) {
|
||||
S += utostr(FD->getIdentifier()->getLength());
|
||||
S += FD->getIdentifier()->getName();
|
||||
|
||||
if (FD->param_size() == 0)
|
||||
S += 'v';
|
||||
else
|
||||
assert(0 && "mangling of types not supported yet!");
|
||||
} else
|
||||
assert(0 && "Unsupported decl type!");
|
||||
}
|
||||
|
||||
static void mangleVarDeclInternal(const VarDecl &D, std::string &S)
|
||||
{
|
||||
S += 'Z';
|
||||
mangleDeclContextInternal(D.getDeclContext(), S);
|
||||
S += 'E';
|
||||
|
||||
S += utostr(D.getIdentifier()->getLength());
|
||||
S += D.getIdentifier()->getName();
|
||||
}
|
||||
|
||||
static std::string mangleVarDecl(const VarDecl& D)
|
||||
{
|
||||
std::string S = "_Z";
|
||||
|
||||
mangleVarDeclInternal(D, S);
|
||||
|
||||
return S;
|
||||
}
|
||||
|
||||
static std::string mangleGuardVariable(const VarDecl& D)
|
||||
{
|
||||
std::string S = "_ZGV";
|
||||
|
||||
mangleVarDeclInternal(D, S);
|
||||
|
||||
return S;
|
||||
}
|
||||
|
||||
llvm::GlobalValue *
|
||||
CodeGenFunction::GenerateStaticCXXBlockVarDecl(const VarDecl &D)
|
||||
{
|
||||
assert(!getContext().getLangOptions().ThreadsafeStatics &&
|
||||
"thread safe statics are currently not supported!");
|
||||
const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(D.getType());
|
||||
|
||||
// FIXME: If the function is inline, the linkage should be weak.
|
||||
llvm::GlobalValue::LinkageTypes linkage = llvm::GlobalValue::InternalLinkage;
|
||||
|
||||
// Create the guard variable.
|
||||
llvm::GlobalValue *GuardV =
|
||||
new llvm::GlobalVariable(llvm::Type::Int64Ty, false,
|
||||
linkage,
|
||||
llvm::Constant::getNullValue(llvm::Type::Int64Ty),
|
||||
mangleGuardVariable(D),
|
||||
&CGM.getModule());
|
||||
|
||||
// FIXME: Address space.
|
||||
const llvm::Type *PtrTy = llvm::PointerType::get(llvm::Type::Int8Ty, 0);
|
||||
|
||||
// Load the first byte of the guard variable.
|
||||
llvm::Value *V = Builder.CreateLoad(Builder.CreateBitCast(GuardV, PtrTy),
|
||||
"tmp");
|
||||
|
||||
// Compare it against 0.
|
||||
llvm::Value *nullValue = llvm::Constant::getNullValue(llvm::Type::Int8Ty);
|
||||
llvm::Value *ICmp = Builder.CreateICmpEQ(V, nullValue , "tobool");
|
||||
|
||||
llvm::BasicBlock *InitBlock = llvm::BasicBlock::Create("init");
|
||||
llvm::BasicBlock *EndBlock = llvm::BasicBlock::Create("initend");
|
||||
|
||||
// If the guard variable is 0, jump to the initializer code.
|
||||
Builder.CreateCondBr(ICmp, InitBlock, EndBlock);
|
||||
|
||||
EmitBlock(InitBlock);
|
||||
|
||||
llvm::GlobalValue *GV =
|
||||
new llvm::GlobalVariable(LTy, false,
|
||||
llvm::GlobalValue::InternalLinkage,
|
||||
llvm::Constant::getNullValue(LTy),
|
||||
mangleVarDecl(D),
|
||||
&CGM.getModule(), 0,
|
||||
D.getType().getAddressSpace());
|
||||
|
||||
const Expr *Init = D.getInit();
|
||||
if (!hasAggregateLLVMType(Init->getType())) {
|
||||
llvm::Value *V = EmitScalarExpr(Init);
|
||||
Builder.CreateStore(V, GV, D.getType().isVolatileQualified());
|
||||
} else if (Init->getType()->isAnyComplexType()) {
|
||||
EmitComplexExprIntoAddr(Init, GV, D.getType().isVolatileQualified());
|
||||
} else {
|
||||
EmitAggExpr(Init, GV, D.getType().isVolatileQualified());
|
||||
}
|
||||
|
||||
Builder.CreateStore(llvm::ConstantInt::get(llvm::Type::Int8Ty, 1),
|
||||
Builder.CreateBitCast(GuardV, PtrTy));
|
||||
|
||||
EmitBlock(EndBlock);
|
||||
return GV;
|
||||
}
|
||||
|
||||
|
|
@ -86,7 +86,13 @@ CodeGenFunction::GenerateStaticBlockVarDecl(const VarDecl &D,
|
|||
if ((D.getInit() == 0) || NoInit) {
|
||||
Init = llvm::Constant::getNullValue(LTy);
|
||||
} else {
|
||||
Init = CGM.EmitConstantExpr(D.getInit(), this);
|
||||
if (D.getInit()->isConstantExpr(getContext(), 0))
|
||||
Init = CGM.EmitConstantExpr(D.getInit(), this);
|
||||
else {
|
||||
assert(getContext().getLangOptions().CPlusPlus &&
|
||||
"only C++ supports non-constant static initializers!");
|
||||
return GenerateStaticCXXBlockVarDecl(D);
|
||||
}
|
||||
}
|
||||
|
||||
assert(Init && "Unable to create initialiser for static decl");
|
||||
|
|
|
|||
|
|
@ -525,6 +525,10 @@ public:
|
|||
bool NoInit,
|
||||
const char *Separator);
|
||||
|
||||
// GenerateStaticBlockVarDecl - return the static declaration of
|
||||
// a local variable. Performs initialization of the variable if necessary.
|
||||
llvm::GlobalValue *GenerateStaticCXXBlockVarDecl(const VarDecl &D);
|
||||
|
||||
//===--------------------------------------------------------------------===//
|
||||
// Internal Helpers
|
||||
//===--------------------------------------------------------------------===//
|
||||
|
|
|
|||
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