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| author | James Molloy <james.molloy@arm.com> | 2015-11-12 15:36:04 +0000 |
|---|---|---|
| committer | James Molloy <james.molloy@arm.com> | 2015-11-12 15:36:04 +0000 |
| commit | c16a60b63e49d4ee8a054c0df54793aacd336289 (patch) | |
| tree | bb6faf00712affbba06810b9d856f925564b0520 /clang/lib/CodeGen/CodeGenFunction.cpp | |
| parent | c744e120f601955b20f84273e2d770b6c054f45d (diff) | |
| download | llvm-c16a60b63e49d4ee8a054c0df54793aacd336289.zip llvm-c16a60b63e49d4ee8a054c0df54793aacd336289.tar.gz llvm-c16a60b63e49d4ee8a054c0df54793aacd336289.tar.bz2 | |
[C++] Add the "norecurse" attribute to main() if in C++ mode
The C++ spec (3.6.1.3) says "The function `main` shall not be used within a program". This implies that it cannot recurse, so add the norecurse attribute to help the midend out a bit.
llvm-svn: 252902
Diffstat (limited to 'clang/lib/CodeGen/CodeGenFunction.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CodeGenFunction.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp index 1d3ad9b..b5812c8 100644 --- a/clang/lib/CodeGen/CodeGenFunction.cpp +++ b/clang/lib/CodeGen/CodeGenFunction.cpp @@ -716,6 +716,14 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, } } + // If we're in C++ mode and the function name is "main", it is guaranteed + // to be norecurse by the standard (3.6.1.3 "The function main shall not be + // used within a program"). + if (getLangOpts().CPlusPlus) + if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) + if (FD->isMain()) + Fn->addFnAttr(llvm::Attribute::NoRecurse); + llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn); // Create a marker to make it easy to insert allocas into the entryblock |