From 4ef7eafa3f823443d1b8921f6020d946612281db Mon Sep 17 00:00:00 2001 From: Rafael Espindola Date: Thu, 25 Jul 2013 03:23:25 +0000 Subject: Respect llvm.used in Internalize. The language reference says that: "If a symbol appears in the @llvm.used list, then the compiler, assembler, and linker are required to treat the symbol as if there is a reference to the symbol that it cannot see" Since even the linker cannot see the reference, we must assume that the reference can be using the symbol table. For example, a user can add __attribute__((used)) to a debug helper function like dump and use it from a debugger. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187103 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Utils/ModuleUtils.cpp | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'lib/Transforms/Utils/ModuleUtils.cpp') diff --git a/lib/Transforms/Utils/ModuleUtils.cpp b/lib/Transforms/Utils/ModuleUtils.cpp index d090b48..ff6e6f9 100644 --- a/lib/Transforms/Utils/ModuleUtils.cpp +++ b/lib/Transforms/Utils/ModuleUtils.cpp @@ -12,6 +12,7 @@ //===----------------------------------------------------------------------===// #include "llvm/Transforms/Utils/ModuleUtils.h" +#include "llvm/ADT/SmallPtrSet.h" #include "llvm/IR/DerivedTypes.h" #include "llvm/IR/Function.h" #include "llvm/IR/IRBuilder.h" @@ -62,3 +63,20 @@ void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority) { void llvm::appendToGlobalDtors(Module &M, Function *F, int Priority) { appendToGlobalArray("llvm.global_dtors", M, F, Priority); } + +GlobalVariable * +llvm::collectUsedGlobalVariables(Module &M, SmallPtrSet &Set, + bool CompilerUsed) { + const char *Name = CompilerUsed ? "llvm.compiler.used" : "llvm.used"; + GlobalVariable *GV = M.getGlobalVariable(Name); + if (!GV || !GV->hasInitializer()) + return GV; + + const ConstantArray *Init = cast(GV->getInitializer()); + for (unsigned I = 0, E = Init->getNumOperands(); I != E; ++I) { + Value *Op = Init->getOperand(I); + GlobalValue *G = cast(Op->stripPointerCastsNoFollowAliases()); + Set.insert(G); + } + return GV; +} -- cgit v1.1