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Do not strip llvm.used values.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46045 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2008-01-16 03:33:05 +00:00
parent 316e984471
commit 8c231e5dda
3 changed files with 43 additions and 3 deletions
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28
lib/Transforms/IPO/StripSymbols.cpp
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@@ -29,6 +29,7 @@
#include "llvm/ValueSymbolTable.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/Support/Compiler.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
namespace {
@@ -100,13 +101,34 @@ bool StripSymbols::runOnModule(Module &M) {
// If we're not just stripping debug info, strip all symbols from the
// functions and the names from any internal globals.
if (!OnlyDebugInfo) {
SmallPtrSet<const Constant *, 8> llvmUsedValues;
Value *LLVMUsed = M.getValueSymbolTable().lookup("llvm.used");
if (LLVMUsed) {
// Collect values that are preserved as per explicit request.
// llvm.used is used to list these values.
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(LLVMUsed)) {
if (ConstantArray *InitList =
dyn_cast<ConstantArray>(GV->getInitializer())) {
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
if (ConstantExpr *CE =
dyn_cast<ConstantExpr>(InitList->getOperand(i)))
if (CE->isCast())
llvmUsedValues.insert(CE->getOperand(0));
}
}
}
}
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (I->hasInternalLinkage())
I != E; ++I) {
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
I->setName(""); // Internal symbols can't participate in linkage
else if (I->getName() == "llvm.used") {
}
}
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
if (I->hasInternalLinkage())
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
I->setName(""); // Internal symbols can't participate in linkage
StripSymtab(I->getValueSymbolTable());
}