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Mark BumpPtrAllocator::Allocate as returning a noalias pointer.

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The GCC attribute is curiously named 'malloc', but I think it's better
to use LLVM terminology for the wrapper macro.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234121 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2015-04-05 17:02:25 +00:00
parent 4cd2e19856
commit 7368f2145a
2 changed files with 12 additions and 1 deletions
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3
include/llvm/Support/Allocator.h
View File

@ -203,7 +203,8 @@ public:
}
/// \brief Allocate space at the specified alignment.
LLVM_ATTRIBUTE_RETURNS_NONNULL void *Allocate(size_t Size, size_t Alignment) {
LLVM_ATTRIBUTE_RETURNS_NONNULL LLVM_ATTRIBUTE_RETURNS_NOALIAS void *
Allocate(size_t Size, size_t Alignment) {
assert(Alignment > 0 && "0-byte alignnment is not allowed. Use 1 instead.");
// Keep track of how many bytes we've allocated.

10
include/llvm/Support/Compiler.h
View File

@ -223,6 +223,16 @@
#define LLVM_ATTRIBUTE_RETURNS_NONNULL
#endif
/// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a
/// pointer that does not alias any other valid pointer.
#ifdef __GNUC__
#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__))
#elif defined(_MSC_VER)
#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict)
#else
#define LLVM_ATTRIBUTE_RETURNS_NOALIAS
#endif
/// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
/// pedantic diagnostics.
#ifdef __GNUC__