implement a new magic global "llvm.compiler.used" which is like llvm.used, but
doesn't cause ".no_dead_strip" to be emitted on darwin.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76399 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/StripSymbols.cpp b/lib/Transforms/IPO/StripSymbols.cpp
index 82a0952..8f3a7f4 100644
--- a/lib/Transforms/IPO/StripSymbols.cpp
+++ b/lib/Transforms/IPO/StripSymbols.cpp
@@ -157,32 +157,26 @@
}
/// Find values that are marked as llvm.used.
-void findUsedValues(Module &M,
- SmallPtrSet<const GlobalValue*, 8>& llvmUsedValues) {
- if (GlobalVariable *LLVMUsed = M.getGlobalVariable("llvm.used")) {
- llvmUsedValues.insert(LLVMUsed);
- // Collect values that are preserved as per explicit request.
- // llvm.used is used to list these values.
- if (ConstantArray *Inits =
- dyn_cast<ConstantArray>(LLVMUsed->getInitializer())) {
- for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i) {
- if (GlobalValue *GV = dyn_cast<GlobalValue>(Inits->getOperand(i)))
- llvmUsedValues.insert(GV);
- else if (ConstantExpr *CE =
- dyn_cast<ConstantExpr>(Inits->getOperand(i)))
- if (CE->getOpcode() == Instruction::BitCast)
- if (GlobalValue *GV = dyn_cast<GlobalValue>(CE->getOperand(0)))
- llvmUsedValues.insert(GV);
- }
- }
- }
+static void findUsedValues(GlobalVariable *LLVMUsed,
+ SmallPtrSet<const GlobalValue*, 8> &UsedValues) {
+ if (LLVMUsed == 0) return;
+ UsedValues.insert(LLVMUsed);
+
+ ConstantArray *Inits = dyn_cast<ConstantArray>(LLVMUsed->getInitializer());
+ if (Inits == 0) return;
+
+ for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
+ if (GlobalValue *GV =
+ dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
+ UsedValues.insert(GV);
}
/// StripSymbolNames - Strip symbol names.
bool StripSymbolNames(Module &M, bool PreserveDbgInfo) {
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
- findUsedValues(M, llvmUsedValues);
+ findUsedValues(M.getGlobalVariable("llvm.used"), llvmUsedValues);
+ findUsedValues(M.getGlobalVariable("llvm.compiler.used"), llvmUsedValues);
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
@@ -210,7 +204,8 @@
bool StripDebugInfo(Module &M) {
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
- findUsedValues(M, llvmUsedValues);
+ findUsedValues(M.getGlobalVariable("llvm.used"), llvmUsedValues);
+ findUsedValues(M.getGlobalVariable("llvm.compiler.used"), llvmUsedValues);
SmallVector<GlobalVariable *, 2> CUs;
SmallVector<GlobalVariable *, 4> GVs;