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Do not emit a UsedDirective for things in the llvm.used

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list that have internal linkage; the linker doesn't need
or want this.  (These objects must still be preserved
at compile time, so just removing them from the llvm.used
list doesn't work.)  Should affect only Darwin.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55722 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2008-09-03 20:34:58 +00:00
parent 7946e7b8a4
commit 61e6093dc8
2 changed files with 33 additions and 3 deletions
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1
include/llvm/CodeGen/AsmPrinter.h
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@ -363,6 +363,7 @@ namespace llvm {
void printVisibility(const std::string& Name, unsigned Visibility) const;
private:
const GlobalValue *findGlobalValue(const Constant* CV);
void EmitLLVMUsedList(Constant *List);
void EmitXXStructorList(Constant *List);
void EmitConstantPool(unsigned Alignment, const char *Section,

35
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -425,8 +425,34 @@ bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
return false;
}
/// findGlobalValue - if CV is an expression equivalent to a single
/// global value, return that value.
const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) {
if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
return GV;
else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
const TargetData *TD = TM.getTargetData();
unsigned Opcode = CE->getOpcode();
switch (Opcode) {
case Instruction::GetElementPtr: {
const Constant *ptrVal = CE->getOperand(0);
SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size()))
return 0;
return findGlobalValue(ptrVal);
}
case Instruction::BitCast:
return findGlobalValue(CE->getOperand(0));
default:
return 0;
}
}
return 0;
}
/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
/// global in the specified llvm.used list as being used with this directive.
/// Non-globals (i.e. internal linkage) should not be emitted.
void AsmPrinter::EmitLLVMUsedList(Constant *List) {
const char *Directive = TAI->getUsedDirective();
@ -435,9 +461,12 @@ void AsmPrinter::EmitLLVMUsedList(Constant *List) {
if (InitList == 0) return;
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
O << Directive;
EmitConstantValueOnly(InitList->getOperand(i));
O << '\n';
const GlobalValue *GV = findGlobalValue(InitList->getOperand(i));
if (GV && !GV->hasInternalLinkage()) {
O << Directive;
EmitConstantValueOnly(InitList->getOperand(i));
O << '\n';
}
}
}