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Add ELF and darwin support for static ctors and dtors
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24693 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -18,6 +18,7 @@
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#include "X86IntelAsmPrinter.h"
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#include "X86Subtarget.h"
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#include "X86.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/Assembly/Writer.h"
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@ -73,6 +74,21 @@ bool X86SharedAsmPrinter::doInitialization(Module &M) {
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return AsmPrinter::doInitialization(M);
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}
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/// EmitXXStructorList - Emit the ctor or dtor list. On darwin, this just
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/// prints out the function pointers.
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void X86SharedAsmPrinter::EmitXXStructorList(Constant *List) {
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// Should be an array of '{ int, void ()* }' structs. The first value is the
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// init priority, which we ignore.
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if (!isa<ConstantArray>(List)) return;
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ConstantArray *InitList = cast<ConstantArray>(List);
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
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if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
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if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
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// Emit the function pointer.
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EmitGlobalConstant(CS->getOperand(1));
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}
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}
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bool X86SharedAsmPrinter::doFinalization(Module &M) {
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const TargetData &TD = TM.getTargetData();
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@ -81,6 +97,29 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
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E = M.global_end(); I != E; ++I) {
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if (!I->hasInitializer()) continue; // External global require no code
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// Check to see if this is a special global used by LLVM.
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if (I->hasAppendingLinkage()) {
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if (I->getName() == "llvm.used")
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continue; // No need to emit this at all.
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if (I->getName() == "llvm.global_ctors") {
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if (forDarwin)
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SwitchSection(".mod_init_func", 0);
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else
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SwitchSection(".ctors,\"aw\",@progbits", 0);
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EmitAlignment(2, 0);
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EmitXXStructorList(I->getInitializer());
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continue;
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} else if (I->getName() == "llvm.global_dtors") {
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if (forDarwin)
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SwitchSection(".mod_term_func", 0);
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else
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SwitchSection(".dtors,\"aw\",@progbits", 0);
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EmitAlignment(2, 0);
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EmitXXStructorList(I->getInitializer());
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continue;
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}
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}
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O << "\n\n";
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std::string name = Mang->getValueName(I);
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Constant *C = I->getInitializer();
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@ -33,6 +33,7 @@ struct X86SharedAsmPrinter : public AsmPrinter {
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bool doInitialization(Module &M);
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bool doFinalization(Module &M);
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void EmitXXStructorList(Constant *List);
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bool forDarwin; // FIXME: eliminate.
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