From 4fbf84c1732fca596ad1d6e96015e19760eb8a9b Mon Sep 17 00:00:00 2001 From: Manoj Gupta Date: Wed, 9 May 2018 21:41:18 +0000 Subject: [Clang] Implement function attribute no_stack_protector. Summary: This attribute tells clang to skip this function from stack protector when -stack-protector option is passed. GCC option for this is: __attribute__((__optimize__("no-stack-protector"))) and the equivalent clang syntax would be: __attribute__((no_stack_protector)) This is used in Linux kernel to selectively disable stack protector in certain functions. Reviewers: aaron.ballman, rsmith, rnk, probinson Reviewed By: aaron.ballman Subscribers: probinson, srhines, cfe-commits Differential Revision: https://reviews.llvm.org/D46300 llvm-svn: 331925 --- clang/lib/CodeGen/CodeGenModule.cpp | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'clang/lib/CodeGen/CodeGenModule.cpp') diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp index bfdd1e65e2c..3a27d999352 100644 --- a/clang/lib/CodeGen/CodeGenModule.cpp +++ b/clang/lib/CodeGen/CodeGenModule.cpp @@ -1142,12 +1142,14 @@ void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, if (!hasUnwindExceptions(LangOpts)) B.addAttribute(llvm::Attribute::NoUnwind); - if (LangOpts.getStackProtector() == LangOptions::SSPOn) - B.addAttribute(llvm::Attribute::StackProtect); - else if (LangOpts.getStackProtector() == LangOptions::SSPStrong) - B.addAttribute(llvm::Attribute::StackProtectStrong); - else if (LangOpts.getStackProtector() == LangOptions::SSPReq) - B.addAttribute(llvm::Attribute::StackProtectReq); + if (!D || !D->hasAttr()) { + if (LangOpts.getStackProtector() == LangOptions::SSPOn) + B.addAttribute(llvm::Attribute::StackProtect); + else if (LangOpts.getStackProtector() == LangOptions::SSPStrong) + B.addAttribute(llvm::Attribute::StackProtectStrong); + else if (LangOpts.getStackProtector() == LangOptions::SSPReq) + B.addAttribute(llvm::Attribute::StackProtectReq); + } if (!D) { // If we don't have a declaration to control inlining, the function isn't -- cgit v1.2.3