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Add ELF and darwin support for static ctors and dtors

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24693 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-12-13 04:53:51 +00:00
parent deea416570
commit a046e0d79f
2 changed files with 40 additions and 0 deletions
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39
lib/Target/X86/X86AsmPrinter.cpp
View File

@ -18,6 +18,7 @@
#include "X86IntelAsmPrinter.h"
#include "X86Subtarget.h"
#include "X86.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
@ -73,6 +74,21 @@ bool X86SharedAsmPrinter::doInitialization(Module &M) {
return AsmPrinter::doInitialization(M);
}
/// EmitXXStructorList - Emit the ctor or dtor list. On darwin, this just
/// prints out the function pointers.
void X86SharedAsmPrinter::EmitXXStructorList(Constant *List) {
// Should be an array of '{ int, void ()* }' structs. The first value is the
// init priority, which we ignore.
if (!isa<ConstantArray>(List)) return;
ConstantArray *InitList = cast<ConstantArray>(List);
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
// Emit the function pointer.
EmitGlobalConstant(CS->getOperand(1));
}
}
bool X86SharedAsmPrinter::doFinalization(Module &M) {
const TargetData &TD = TM.getTargetData();
@ -81,6 +97,29 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
E = M.global_end(); I != E; ++I) {
if (!I->hasInitializer()) continue; // External global require no code
// Check to see if this is a special global used by LLVM.
if (I->hasAppendingLinkage()) {
if (I->getName() == "llvm.used")
continue; // No need to emit this at all.
if (I->getName() == "llvm.global_ctors") {
if (forDarwin)
SwitchSection(".mod_init_func", 0);
else
SwitchSection(".ctors,\"aw\",@progbits", 0);
EmitAlignment(2, 0);
EmitXXStructorList(I->getInitializer());
continue;
} else if (I->getName() == "llvm.global_dtors") {
if (forDarwin)
SwitchSection(".mod_term_func", 0);
else
SwitchSection(".dtors,\"aw\",@progbits", 0);
EmitAlignment(2, 0);
EmitXXStructorList(I->getInitializer());
continue;
}
}
O << "\n\n";
std::string name = Mang->getValueName(I);
Constant *C = I->getInitializer();

1
lib/Target/X86/X86AsmPrinter.h
View File

@ -33,6 +33,7 @@ struct X86SharedAsmPrinter : public AsmPrinter {
bool doInitialization(Module &M);
bool doFinalization(Module &M);
void EmitXXStructorList(Constant *List);
bool forDarwin; // FIXME: eliminate.