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The following patch adds __attribute__((no_address_safety_analysis)) which will allow to disable

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address safety analysis (such as e.g. AddressSanitizer or SAFECode) for a specific function.

When building with AddressSanitizer, add AddressSafety function attribute to every generated function
except for those that have __attribute__((no_address_safety_analysis)).

With this patch we will be able to
1. disable AddressSanitizer for a particular function
2. disable AddressSanitizer-hostile optimizations (such as some cases of load widening) when AddressSanitizer is on.

llvm-svn: 148842
This commit is contained in:
Kostya Serebryany
2012-01-24 19:25:38 +00:00
parent 64cee06504
commit 588d6abf7d
7 changed files with 73 additions and 0 deletions
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8
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -1019,6 +1019,14 @@ CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
if (ExtraAttrs != llvm::Attribute::None)
F->addFnAttr(ExtraAttrs);
if (Features.AddressSanitizer) {
// When AddressSanitizer is enabled, set AddressSafety attribute
// unless __attribute__((no_address_safety_analysis)) is used.
const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl());
if (!FD || !FD->hasAttr<NoAddressSafetyAnalysisAttr>())
F->addFnAttr(llvm::Attribute::AddressSafety);
}
// This is the first use or definition of a mangled name. If there is a
// deferred decl with this name, remember that we need to emit it at the end
// of the file.