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Add support for targets that want to do something with the llvm.used list,

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because they have an aggressive linker that does dead code stripping.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30604 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-09-26 03:38:18 +00:00
parent 384299ef45
commit cb05af852f
4 changed files with 31 additions and 2 deletions
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lib/CodeGen/AsmPrinter.cpp
+21 -2
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@@ -253,8 +253,11 @@ bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
assert(GV->hasInitializer() && "Not a special LLVM global!");
if (GV->getName() == "llvm.used")
return true; // No need to emit this at all.
if (GV->getName() == "llvm.used") {
if (TAI->getUsedDirective() != 0) // No need to emit this at all.
EmitLLVMUsedList(GV->getInitializer());
return true;
}
if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
SwitchToDataSection(TAI->getStaticCtorsSection(), 0);
@@ -273,6 +276,22 @@ bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
return false;
}
/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
/// global in the specified llvm.used list as being used with this directive.
void AsmPrinter::EmitLLVMUsedList(Constant *List) {
const char *Directive = TAI->getUsedDirective();
// Should be an array of 'sbyte*'.
ConstantArray *InitList = dyn_cast<ConstantArray>(List);
if (InitList == 0) return;
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
O << Directive;
EmitConstantValueOnly(InitList->getOperand(i));
O << "\n";
}
}
/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
/// function pointers, ignoring the init priority.
void AsmPrinter::EmitXXStructorList(Constant *List) {