d8110b6558
Static locals requiring initialization are not thread safe on Windows. Unfortunately, it's possible to create static locals that are actually externally visible with inline functions and templates. As a result, we have to implement an initialization guard scheme that is compatible with TUs built by MSVC, which makes thread safety prohibitively difficult. MSVC's scheme is that every function that requires a guard gets an i32 bitfield. Each static local is assigned a bit that indicates if it has been initialized, up to 32 bits, at which point a new bitfield is created. MSVC rejects inline functions with more than 32 static locals, and the externally visible mangling (?_B) only allows for one guard variable per function. On Eli's recommendation, I used MangleNumberingContext to track which bit each static corresponds to. Implements PR16888. Reviewers: rjmccall, eli.friedman Differential Revision: http://llvm-reviews.chandlerc.com/D1416 llvm-svn: 190427
44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
//===--- MangleNumberingContext.cpp - Context for mangling numbers --------===//
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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 file defines the LambdaMangleContext class, which keeps track of
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// the Itanium C++ ABI mangling numbers for lambda expressions.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/MangleNumberingContext.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclCXX.h"
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using namespace clang;
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unsigned
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MangleNumberingContext::getManglingNumber(const CXXMethodDecl *CallOperator) {
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const FunctionProtoType *Proto
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= CallOperator->getType()->getAs<FunctionProtoType>();
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ASTContext &Context = CallOperator->getASTContext();
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QualType Key = Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(),
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FunctionProtoType::ExtProtoInfo());
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Key = Context.getCanonicalType(Key);
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return ++ManglingNumbers[Key->castAs<FunctionProtoType>()];
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}
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unsigned
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MangleNumberingContext::getManglingNumber(const BlockDecl *BD) {
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// FIXME: Compute a BlockPointerType? Not obvious how.
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const Type *Ty = 0;
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return ++ManglingNumbers[Ty];
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}
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unsigned
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MangleNumberingContext::getManglingNumber(const TagDecl *TD) {
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return ++TagManglingNumbers[TD->getIdentifier()];
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}
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