[Analysis] Add LibFunc_ prefix to enums in TargetLibraryInfo. (NFC)

Summary:
The LibFunc::Func enum holds enumerators named for libc functions.
Unfortunately, there are real situations, including libc implementations, where
function names are actually macros (musl uses "#define fopen64 fopen", for
example; any other transitively visible macro would have similar effects).

Strictly speaking, a conforming C++ Standard Library should provide any such
macros as functions instead (via <cstdio>). However, there are some "library"
functions which are not part of the standard, and thus not subject to this
rule (fopen64, for example). So, in order to be both portable and consistent,
the enum should not use the bare function names.

The old enum naming used a namespace LibFunc and an enum Func, with bare
enumerators. This patch changes LibFunc to be an enum with enumerators prefixed
with "LibFFunc_". (Unfortunately, a scoped enum is not sufficient to override
macros.)

There are additional changes required in clang.

Reviewers: rsmith

Subscribers: mehdi_amini, mzolotukhin, nemanjai, llvm-commits

Differential Revision: https://reviews.llvm.org/D28476

llvm-svn: 292848

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
index 0d637ddaf39..a8004713753 100644
--- a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
+++ b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
@@ -1274,7 +1274,7 @@ bool MemCpyOptPass::processMemCpy(MemCpyInst *M) {
 bool MemCpyOptPass::processMemMove(MemMoveInst *M) {
   AliasAnalysis &AA = LookupAliasAnalysis();
 
-  if (!TLI->has(LibFunc::memmove))
+  if (!TLI->has(LibFunc_memmove))
     return false;
 
   // See if the pointers alias.
@@ -1449,7 +1449,7 @@ bool MemCpyOptPass::runImpl(
   // If we don't have at least memset and memcpy, there is little point of doing
   // anything here.  These are required by a freestanding implementation, so if
   // even they are disabled, there is no point in trying hard.
-  if (!TLI->has(LibFunc::memset) || !TLI->has(LibFunc::memcpy))
+  if (!TLI->has(LibFunc_memset) || !TLI->has(LibFunc_memcpy))
     return false;
 
   while (true) {