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Respect llvm.used in Internalize.

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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
This commit is contained in:
Rafael Espindola
2013-07-25 03:23:25 +00:00
parent b97b162731
commit 4ef7eafa3f
5 changed files with 69 additions and 21 deletions
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18
lib/Transforms/Utils/ModuleUtils.cpp
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@ -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<GlobalValue *, 8> &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<ConstantArray>(GV->getInitializer());
for (unsigned I = 0, E = Init->getNumOperands(); I != E; ++I) {
Value *Op = Init->getOperand(I);
GlobalValue *G = cast<GlobalValue>(Op->stripPointerCastsNoFollowAliases());
Set.insert(G);
}
return GV;
}