mirror of
https://github.com/c64scene-ar/llvm-6502.git
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2f1ae88445
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29318 91177308-0d34-0410-b5e6-96231b3b80d8
686 lines
23 KiB
C++
686 lines
23 KiB
C++
//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to PowerPC assembly language. This printer is
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// the output mechanism used by `llc'.
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//
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// Documentation at http://developer.apple.com/documentation/DeveloperTools/
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// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asmprinter"
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#include "PPC.h"
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#include "PPCTargetMachine.h"
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#include "PPCSubtarget.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/DwarfWriter.h"
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#include "llvm/CodeGen/MachineDebugInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Visibility.h"
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#include "llvm/Target/MRegisterInfo.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringExtras.h"
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#include <iostream>
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#include <set>
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using namespace llvm;
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namespace {
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Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
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class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
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public:
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std::set<std::string> FnStubs, GVStubs;
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PPCAsmPrinter(std::ostream &O, TargetMachine &TM)
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: AsmPrinter(O, TM) {}
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virtual const char *getPassName() const {
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return "PowerPC Assembly Printer";
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}
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PPCTargetMachine &getTM() {
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return static_cast<PPCTargetMachine&>(TM);
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}
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unsigned enumRegToMachineReg(unsigned enumReg) {
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switch (enumReg) {
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default: assert(0 && "Unhandled register!"); break;
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case PPC::CR0: return 0;
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case PPC::CR1: return 1;
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case PPC::CR2: return 2;
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case PPC::CR3: return 3;
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case PPC::CR4: return 4;
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case PPC::CR5: return 5;
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case PPC::CR6: return 6;
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case PPC::CR7: return 7;
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}
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abort();
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}
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/// printInstruction - This method is automatically generated by tablegen
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/// from the instruction set description. This method returns true if the
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/// machine instruction was sufficiently described to print it, otherwise it
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/// returns false.
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bool printInstruction(const MachineInstr *MI);
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void printMachineInstruction(const MachineInstr *MI);
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void printOp(const MachineOperand &MO);
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void printOperand(const MachineInstr *MI, unsigned OpNo) {
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const MachineOperand &MO = MI->getOperand(OpNo);
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if (MO.isRegister()) {
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assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
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O << TM.getRegisterInfo()->get(MO.getReg()).Name;
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} else if (MO.isImmediate()) {
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O << MO.getImmedValue();
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} else {
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printOp(MO);
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}
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}
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode);
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode);
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void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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char value = MI->getOperand(OpNo).getImmedValue();
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value = (value << (32-5)) >> (32-5);
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O << (int)value;
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}
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void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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unsigned char value = MI->getOperand(OpNo).getImmedValue();
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assert(value <= 31 && "Invalid u5imm argument!");
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O << (unsigned int)value;
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}
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void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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unsigned char value = MI->getOperand(OpNo).getImmedValue();
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assert(value <= 63 && "Invalid u6imm argument!");
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O << (unsigned int)value;
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}
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void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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O << (short)MI->getOperand(OpNo).getImmedValue();
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}
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void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
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}
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void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
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O << (short)(MI->getOperand(OpNo).getImmedValue()*4);
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}
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void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
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// Branches can take an immediate operand. This is used by the branch
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// selection pass to print $+8, an eight byte displacement from the PC.
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if (MI->getOperand(OpNo).isImmediate()) {
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O << "$+" << MI->getOperand(OpNo).getImmedValue();
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} else {
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printOp(MI->getOperand(OpNo));
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}
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}
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void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
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const MachineOperand &MO = MI->getOperand(OpNo);
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if (TM.getRelocationModel() != Reloc::Static) {
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if (MO.getType() == MachineOperand::MO_GlobalAddress) {
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GlobalValue *GV = MO.getGlobal();
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if (((GV->isExternal() || GV->hasWeakLinkage() ||
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GV->hasLinkOnceLinkage()))) {
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// Dynamically-resolved functions need a stub for the function.
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std::string Name = Mang->getValueName(GV);
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FnStubs.insert(Name);
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O << "L" << Name << "$stub";
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return;
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}
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}
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if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
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std::string Name(GlobalPrefix); Name += MO.getSymbolName();
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FnStubs.insert(Name);
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O << "L" << Name << "$stub";
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return;
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}
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}
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printOp(MI->getOperand(OpNo));
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}
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void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
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O << (int)MI->getOperand(OpNo).getImmedValue()*4;
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}
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void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
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O << "\"L" << getFunctionNumber() << "$pb\"\n";
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O << "\"L" << getFunctionNumber() << "$pb\":";
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}
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void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
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if (MI->getOperand(OpNo).isImmediate()) {
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printS16ImmOperand(MI, OpNo);
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} else {
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O << "ha16(";
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printOp(MI->getOperand(OpNo));
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if (TM.getRelocationModel() == Reloc::PIC_)
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O << "-\"L" << getFunctionNumber() << "$pb\")";
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else
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O << ')';
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}
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}
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void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
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if (MI->getOperand(OpNo).isImmediate()) {
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printS16ImmOperand(MI, OpNo);
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} else {
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O << "lo16(";
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printOp(MI->getOperand(OpNo));
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if (TM.getRelocationModel() == Reloc::PIC_)
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O << "-\"L" << getFunctionNumber() << "$pb\")";
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else
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O << ')';
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}
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}
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void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
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unsigned CCReg = MI->getOperand(OpNo).getReg();
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unsigned RegNo = enumRegToMachineReg(CCReg);
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O << (0x80 >> RegNo);
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}
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// The new addressing mode printers.
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void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
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printSymbolLo(MI, OpNo);
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O << '(';
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if (MI->getOperand(OpNo+1).isRegister() &&
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MI->getOperand(OpNo+1).getReg() == PPC::R0)
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O << "0";
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else
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printOperand(MI, OpNo+1);
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O << ')';
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}
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void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
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if (MI->getOperand(OpNo).isImmediate())
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printS16X4ImmOperand(MI, OpNo);
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else
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printSymbolLo(MI, OpNo);
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O << '(';
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if (MI->getOperand(OpNo+1).isRegister() &&
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MI->getOperand(OpNo+1).getReg() == PPC::R0)
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O << "0";
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else
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printOperand(MI, OpNo+1);
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O << ')';
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}
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void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
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// When used as the base register, r0 reads constant zero rather than
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// the value contained in the register. For this reason, the darwin
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// assembler requires that we print r0 as 0 (no r) when used as the base.
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const MachineOperand &MO = MI->getOperand(OpNo);
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if (MO.getReg() == PPC::R0)
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O << '0';
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else
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O << TM.getRegisterInfo()->get(MO.getReg()).Name;
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O << ", ";
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printOperand(MI, OpNo+1);
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}
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virtual bool runOnMachineFunction(MachineFunction &F) = 0;
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virtual bool doFinalization(Module &M) = 0;
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};
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/// DarwinDwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X
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///
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struct VISIBILITY_HIDDEN DarwinDwarfWriter : public DwarfWriter {
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// Ctor.
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DarwinDwarfWriter(std::ostream &o, AsmPrinter *ap)
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: DwarfWriter(o, ap)
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{
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needsSet = true;
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DwarfAbbrevSection = ".section __DWARF,__debug_abbrev";
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DwarfInfoSection = ".section __DWARF,__debug_info";
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DwarfLineSection = ".section __DWARF,__debug_line";
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DwarfFrameSection = ".section __DWARF,__debug_frame";
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DwarfPubNamesSection = ".section __DWARF,__debug_pubnames";
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DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes";
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DwarfStrSection = ".section __DWARF,__debug_str";
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DwarfLocSection = ".section __DWARF,__debug_loc";
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DwarfARangesSection = ".section __DWARF,__debug_aranges";
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DwarfRangesSection = ".section __DWARF,__debug_ranges";
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DwarfMacInfoSection = ".section __DWARF,__debug_macinfo";
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TextSection = ".text";
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DataSection = ".data";
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}
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};
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/// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS
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/// X
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struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter {
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DarwinDwarfWriter DW;
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DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM)
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: PPCAsmPrinter(O, TM), DW(O, this) {
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bool isPPC64 = TM.getSubtargetImpl()->isPPC64();
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CommentString = ";";
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GlobalPrefix = "_";
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PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
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ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
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if (isPPC64)
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Data64bitsDirective = ".quad\t"; // we can't emit a 64-bit unit
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else
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Data64bitsDirective = 0; // we can't emit a 64-bit unit
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AlignmentIsInBytes = false; // Alignment is by power of 2.
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ConstantPoolSection = "\t.const\t";
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JumpTableDataSection = ".const";
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JumpTableTextSection = "\t.text";
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LCOMMDirective = "\t.lcomm\t";
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StaticCtorsSection = ".mod_init_func";
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StaticDtorsSection = ".mod_term_func";
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InlineAsmStart = "# InlineAsm Start";
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InlineAsmEnd = "# InlineAsm End";
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}
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virtual const char *getPassName() const {
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return "Darwin PPC Assembly Printer";
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}
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bool runOnMachineFunction(MachineFunction &F);
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bool doInitialization(Module &M);
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bool doFinalization(Module &M);
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<MachineDebugInfo>();
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PPCAsmPrinter::getAnalysisUsage(AU);
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}
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};
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} // end of anonymous namespace
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/// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly
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/// code for a MachineFunction to the given output stream, in a format that the
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/// Darwin assembler can deal with.
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///
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FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o,
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PPCTargetMachine &tm) {
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return new DarwinAsmPrinter(o, tm);
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}
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// Include the auto-generated portion of the assembly writer
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#include "PPCGenAsmWriter.inc"
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void PPCAsmPrinter::printOp(const MachineOperand &MO) {
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switch (MO.getType()) {
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case MachineOperand::MO_Immediate:
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std::cerr << "printOp() does not handle immediate values\n";
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abort();
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return;
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case MachineOperand::MO_MachineBasicBlock:
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printBasicBlockLabel(MO.getMachineBasicBlock());
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return;
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case MachineOperand::MO_JumpTableIndex:
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O << PrivateGlobalPrefix << "JTI" << getFunctionNumber()
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<< '_' << MO.getJumpTableIndex();
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// FIXME: PIC relocation model
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return;
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case MachineOperand::MO_ConstantPoolIndex:
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O << PrivateGlobalPrefix << "CPI" << getFunctionNumber()
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<< '_' << MO.getConstantPoolIndex();
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return;
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case MachineOperand::MO_ExternalSymbol:
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// Computing the address of an external symbol, not calling it.
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if (TM.getRelocationModel() != Reloc::Static) {
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std::string Name(GlobalPrefix); Name += MO.getSymbolName();
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GVStubs.insert(Name);
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O << "L" << Name << "$non_lazy_ptr";
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return;
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}
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O << GlobalPrefix << MO.getSymbolName();
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return;
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case MachineOperand::MO_GlobalAddress: {
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// Computing the address of a global symbol, not calling it.
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GlobalValue *GV = MO.getGlobal();
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std::string Name = Mang->getValueName(GV);
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int offset = MO.getOffset();
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// External or weakly linked global variables need non-lazily-resolved stubs
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if (TM.getRelocationModel() != Reloc::Static) {
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if (((GV->isExternal() || GV->hasWeakLinkage() ||
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GV->hasLinkOnceLinkage()))) {
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GVStubs.insert(Name);
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O << "L" << Name << "$non_lazy_ptr";
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return;
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}
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}
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O << Name;
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return;
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}
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default:
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O << "<unknown operand type: " << MO.getType() << ">";
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return;
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}
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}
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/// PrintAsmOperand - Print out an operand for an inline asm expression.
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///
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bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode) {
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// Does this asm operand have a single letter operand modifier?
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if (ExtraCode && ExtraCode[0]) {
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if (ExtraCode[1] != 0) return true; // Unknown modifier.
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switch (ExtraCode[0]) {
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default: return true; // Unknown modifier.
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case 'L': // Write second word of DImode reference.
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// Verify that this operand has two consecutive registers.
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if (!MI->getOperand(OpNo).isRegister() ||
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OpNo+1 == MI->getNumOperands() ||
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!MI->getOperand(OpNo+1).isRegister())
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return true;
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++OpNo; // Return the high-part.
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break;
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}
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}
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printOperand(MI, OpNo);
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return false;
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}
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bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode) {
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if (ExtraCode && ExtraCode[0])
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return true; // Unknown modifier.
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printMemRegReg(MI, OpNo);
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return false;
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}
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/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
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/// the current output stream.
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///
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void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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++EmittedInsts;
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// Check for slwi/srwi mnemonics.
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if (MI->getOpcode() == PPC::RLWINM) {
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bool FoundMnemonic = false;
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unsigned char SH = MI->getOperand(2).getImmedValue();
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unsigned char MB = MI->getOperand(3).getImmedValue();
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unsigned char ME = MI->getOperand(4).getImmedValue();
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if (SH <= 31 && MB == 0 && ME == (31-SH)) {
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O << "slwi "; FoundMnemonic = true;
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}
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if (SH <= 31 && MB == (32-SH) && ME == 31) {
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O << "srwi "; FoundMnemonic = true;
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SH = 32-SH;
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}
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if (FoundMnemonic) {
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printOperand(MI, 0);
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O << ", ";
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printOperand(MI, 1);
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O << ", " << (unsigned int)SH << "\n";
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return;
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}
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} else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
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if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
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O << "mr ";
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printOperand(MI, 0);
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O << ", ";
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printOperand(MI, 1);
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O << "\n";
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return;
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}
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}
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if (printInstruction(MI))
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return; // Printer was automatically generated
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assert(0 && "Unhandled instruction in asm writer!");
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abort();
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return;
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}
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/// runOnMachineFunction - This uses the printMachineInstruction()
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/// method to print assembly for each instruction.
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///
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bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
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SetupMachineFunction(MF);
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O << "\n\n";
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// Print out constants referenced by the function
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EmitConstantPool(MF.getConstantPool());
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// Print out jump tables referenced by the function
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EmitJumpTableInfo(MF.getJumpTableInfo());
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// Print out labels for the function.
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const Function *F = MF.getFunction();
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switch (F->getLinkage()) {
|
|
default: assert(0 && "Unknown linkage type!");
|
|
case Function::InternalLinkage: // Symbols default to internal.
|
|
SwitchToTextSection("\t.text", F);
|
|
break;
|
|
case Function::ExternalLinkage:
|
|
SwitchToTextSection("\t.text", F);
|
|
O << "\t.globl\t" << CurrentFnName << "\n";
|
|
break;
|
|
case Function::WeakLinkage:
|
|
case Function::LinkOnceLinkage:
|
|
SwitchToTextSection(
|
|
".section __TEXT,__textcoal_nt,coalesced,pure_instructions", F);
|
|
O << "\t.globl\t" << CurrentFnName << "\n";
|
|
O << "\t.weak_definition\t" << CurrentFnName << "\n";
|
|
break;
|
|
}
|
|
EmitAlignment(4, F);
|
|
O << CurrentFnName << ":\n";
|
|
|
|
// Emit pre-function debug information.
|
|
DW.BeginFunction(&MF);
|
|
|
|
// Print out code for the function.
|
|
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
|
|
I != E; ++I) {
|
|
// Print a label for the basic block.
|
|
if (I != MF.begin()) {
|
|
printBasicBlockLabel(I, true);
|
|
O << '\n';
|
|
}
|
|
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
|
|
II != E; ++II) {
|
|
// Print the assembly for the instruction.
|
|
O << "\t";
|
|
printMachineInstruction(II);
|
|
}
|
|
}
|
|
|
|
// Emit post-function debug information.
|
|
DW.EndFunction();
|
|
|
|
// We didn't modify anything.
|
|
return false;
|
|
}
|
|
|
|
|
|
bool DarwinAsmPrinter::doInitialization(Module &M) {
|
|
if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor())
|
|
O << "\t.machine ppc970\n";
|
|
AsmPrinter::doInitialization(M);
|
|
|
|
// Darwin wants symbols to be quoted if they have complex names.
|
|
Mang->setUseQuotes(true);
|
|
|
|
// Emit initial debug information.
|
|
DW.BeginModule(&M);
|
|
return false;
|
|
}
|
|
|
|
bool DarwinAsmPrinter::doFinalization(Module &M) {
|
|
const TargetData *TD = TM.getTargetData();
|
|
|
|
// Print out module-level global variables here.
|
|
for (Module::const_global_iterator I = M.global_begin(), 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 so, emit it.
|
|
if (EmitSpecialLLVMGlobal(I))
|
|
continue;
|
|
|
|
std::string name = Mang->getValueName(I);
|
|
Constant *C = I->getInitializer();
|
|
unsigned Size = TD->getTypeSize(C->getType());
|
|
unsigned Align = getPreferredAlignmentLog(I);
|
|
|
|
if (C->isNullValue() && /* FIXME: Verify correct */
|
|
(I->hasInternalLinkage() || I->hasWeakLinkage() ||
|
|
I->hasLinkOnceLinkage() ||
|
|
(I->hasExternalLinkage() && !I->hasSection()))) {
|
|
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
|
|
if (I->hasExternalLinkage()) {
|
|
O << "\t.globl " << name << '\n';
|
|
O << "\t.zerofill __DATA, __common, " << name << ", "
|
|
<< Size << ", " << Align;
|
|
} else if (I->hasInternalLinkage()) {
|
|
SwitchToDataSection("\t.data", I);
|
|
O << LCOMMDirective << name << "," << Size << "," << Align;
|
|
} else {
|
|
SwitchToDataSection("\t.data", I);
|
|
O << ".comm " << name << "," << Size;
|
|
}
|
|
O << "\t\t; '" << I->getName() << "'\n";
|
|
} else {
|
|
switch (I->getLinkage()) {
|
|
case GlobalValue::LinkOnceLinkage:
|
|
case GlobalValue::WeakLinkage:
|
|
O << "\t.globl " << name << '\n'
|
|
<< "\t.weak_definition " << name << '\n';
|
|
SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I);
|
|
break;
|
|
case GlobalValue::AppendingLinkage:
|
|
// FIXME: appending linkage variables should go into a section of
|
|
// their name or something. For now, just emit them as external.
|
|
case GlobalValue::ExternalLinkage:
|
|
// If external or appending, declare as a global symbol
|
|
O << "\t.globl " << name << "\n";
|
|
// FALL THROUGH
|
|
case GlobalValue::InternalLinkage:
|
|
SwitchToDataSection("\t.data", I);
|
|
break;
|
|
default:
|
|
std::cerr << "Unknown linkage type!";
|
|
abort();
|
|
}
|
|
|
|
EmitAlignment(Align, I);
|
|
O << name << ":\t\t\t\t; '" << I->getName() << "'\n";
|
|
EmitGlobalConstant(C);
|
|
O << '\n';
|
|
}
|
|
}
|
|
|
|
bool isPPC64 = TD->getPointerSizeInBits() == 64;
|
|
|
|
// Output stubs for dynamically-linked functions
|
|
if (TM.getRelocationModel() == Reloc::PIC_) {
|
|
for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
|
|
i != e; ++i) {
|
|
SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
|
|
"pure_instructions,32", 0);
|
|
EmitAlignment(4);
|
|
O << "L" << *i << "$stub:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
O << "\tmflr r0\n";
|
|
O << "\tbcl 20,31,L0$" << *i << "\n";
|
|
O << "L0$" << *i << ":\n";
|
|
O << "\tmflr r11\n";
|
|
O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
|
|
O << "\tmtlr r0\n";
|
|
if (isPPC64)
|
|
O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
|
|
else
|
|
O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
|
|
O << "\tmtctr r12\n";
|
|
O << "\tbctr\n";
|
|
SwitchToDataSection(".lazy_symbol_pointer", 0);
|
|
O << "L" << *i << "$lazy_ptr:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
if (isPPC64)
|
|
O << "\t.quad dyld_stub_binding_helper\n";
|
|
else
|
|
O << "\t.long dyld_stub_binding_helper\n";
|
|
}
|
|
} else {
|
|
for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
|
|
i != e; ++i) {
|
|
SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
|
|
"pure_instructions,16", 0);
|
|
EmitAlignment(4);
|
|
O << "L" << *i << "$stub:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n";
|
|
if (isPPC64)
|
|
O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
|
|
else
|
|
O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
|
|
O << "\tmtctr r12\n";
|
|
O << "\tbctr\n";
|
|
SwitchToDataSection(".lazy_symbol_pointer", 0);
|
|
O << "L" << *i << "$lazy_ptr:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
if (isPPC64)
|
|
O << "\t.quad dyld_stub_binding_helper\n";
|
|
else
|
|
O << "\t.long dyld_stub_binding_helper\n";
|
|
}
|
|
}
|
|
|
|
O << "\n";
|
|
|
|
// Output stubs for external and common global variables.
|
|
if (GVStubs.begin() != GVStubs.end()) {
|
|
SwitchToDataSection(".non_lazy_symbol_pointer", 0);
|
|
for (std::set<std::string>::iterator I = GVStubs.begin(),
|
|
E = GVStubs.end(); I != E; ++I) {
|
|
O << "L" << *I << "$non_lazy_ptr:\n";
|
|
O << "\t.indirect_symbol " << *I << "\n";
|
|
if (isPPC64)
|
|
O << "\t.quad\t0\n";
|
|
else
|
|
O << "\t.long\t0\n";
|
|
|
|
}
|
|
}
|
|
|
|
// Emit initial debug information.
|
|
DW.EndModule();
|
|
|
|
// Funny Darwin hack: This flag tells the linker that no global symbols
|
|
// contain code that falls through to other global symbols (e.g. the obvious
|
|
// implementation of multiple entry points). If this doesn't occur, the
|
|
// linker can safely perform dead code stripping. Since LLVM never generates
|
|
// code that does this, it is always safe to set.
|
|
O << "\t.subsections_via_symbols\n";
|
|
|
|
AsmPrinter::doFinalization(M);
|
|
return false; // success
|
|
}
|
|
|