mirror of
https://github.com/RPCS3/llvm-mirror.git
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583fd8343e
llvm-svn: 36410
1097 lines
37 KiB
C++
1097 lines
37 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 "PPCPredicates.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/MachineModuleInfo.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/Compiler.h"
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#include "llvm/Target/TargetAsmInfo.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 <set>
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using namespace llvm;
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STATISTIC(EmittedInsts, "Number of machine instrs printed");
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namespace {
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struct VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
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std::set<std::string> FnStubs, GVStubs;
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const PPCSubtarget &Subtarget;
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PPCAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
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: AsmPrinter(O, TM, T), Subtarget(TM.getSubtarget<PPCSubtarget>()) {
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}
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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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/// stripRegisterPrefix - This method strips the character prefix from a
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/// register name so that only the number is left. Used by for linux asm.
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const char *stripRegisterPrefix(const char *RegName) {
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switch (RegName[0]) {
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case 'r':
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case 'f':
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case 'v': return RegName + 1;
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case 'c': if (RegName[1] == 'r') return RegName + 2;
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}
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return RegName;
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}
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/// printRegister - Print register according to target requirements.
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///
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void printRegister(const MachineOperand &MO, bool R0AsZero) {
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unsigned RegNo = MO.getReg();
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assert(MRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
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// If we should use 0 for R0.
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if (R0AsZero && RegNo == PPC::R0) {
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O << "0";
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return;
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}
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const char *RegName = TM.getRegisterInfo()->get(RegNo).Name;
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// Linux assembler (Others?) does not take register mnemonics.
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// FIXME - What about special registers used in mfspr/mtspr?
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if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
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O << RegName;
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}
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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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printRegister(MO, false);
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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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if (MI->getOperand(OpNo).isImmediate()) {
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O << (short)(MI->getOperand(OpNo).getImmedValue()*4);
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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 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()*4;
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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->isDeclaration() || 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 << "$stub";
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if (GV->hasExternalWeakLinkage())
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ExtWeakSymbols.insert(GV);
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return;
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}
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}
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if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
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std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
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FnStubs.insert(Name);
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O << "L" << Name << "$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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if (Subtarget.isDarwin()) 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() << "$pb\"";
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if (Subtarget.isDarwin())
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O << ')';
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else
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O << "@ha";
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}
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}
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void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
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if (MI->getOperand(OpNo).isImmediate()) {
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printS16ImmOperand(MI, OpNo);
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} else {
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if (Subtarget.isDarwin()) O << "lo16(";
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printOp(MI->getOperand(OpNo));
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if (TM.getRelocationModel() == Reloc::PIC_)
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O << "-\"L" << getFunctionNumber() << "$pb\"";
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if (Subtarget.isDarwin())
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O << ')';
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else
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O << "@l";
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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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printRegister(MO, true);
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O << ", ";
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printOperand(MI, OpNo+1);
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}
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void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
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const char *Modifier);
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virtual bool runOnMachineFunction(MachineFunction &F) = 0;
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virtual bool doFinalization(Module &M) = 0;
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virtual void EmitExternalGlobal(const GlobalVariable *GV);
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};
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/// LinuxAsmPrinter - PowerPC assembly printer, customized for Linux
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struct VISIBILITY_HIDDEN LinuxAsmPrinter : public PPCAsmPrinter {
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DwarfWriter DW;
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LinuxAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
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const TargetAsmInfo *T)
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: PPCAsmPrinter(O, TM, T), DW(O, this, T) {
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}
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virtual const char *getPassName() const {
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return "Linux 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<MachineModuleInfo>();
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PPCAsmPrinter::getAnalysisUsage(AU);
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}
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/// getSectionForFunction - Return the section that we should emit the
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/// specified function body into.
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virtual std::string getSectionForFunction(const Function &F) const;
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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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DwarfWriter DW;
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DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
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const TargetAsmInfo *T)
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: PPCAsmPrinter(O, TM, T), DW(O, this, T) {
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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<MachineModuleInfo>();
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PPCAsmPrinter::getAnalysisUsage(AU);
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}
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/// getSectionForFunction - Return the section that we should emit the
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/// specified function body into.
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virtual std::string getSectionForFunction(const Function &F) const;
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};
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} // end of anonymous namespace
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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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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 << TAI->getPrivateGlobalPrefix() << "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 << TAI->getPrivateGlobalPrefix() << "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(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
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GVStubs.insert(Name);
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O << "L" << Name << "$non_lazy_ptr";
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return;
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}
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O << TAI->getGlobalPrefix() << MO.getSymbolName();
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return;
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case MachineOperand::MO_GlobalAddress: {
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// Computing the address of a global symbol, not calling it.
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GlobalValue *GV = MO.getGlobal();
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std::string Name = Mang->getValueName(GV);
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// External or weakly linked global variables need non-lazily-resolved stubs
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if (TM.getRelocationModel() != Reloc::Static) {
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if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
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GV->hasLinkOnceLinkage()))) {
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GVStubs.insert(Name);
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O << "L" << Name << "$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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if (GV->hasExternalWeakLinkage())
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ExtWeakSymbols.insert(GV);
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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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/// EmitExternalGlobal - In this case we need to use the indirect symbol.
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///
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void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
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std::string Name = getGlobalLinkName(GV);
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if (TM.getRelocationModel() != Reloc::Static) {
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GVStubs.insert(Name);
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O << "L" << Name << "$non_lazy_ptr";
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return;
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}
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O << Name;
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}
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/// PrintAsmOperand - Print out an operand for an inline asm expression.
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///
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bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode) {
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// Does this asm operand have a single letter operand modifier?
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if (ExtraCode && ExtraCode[0]) {
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if (ExtraCode[1] != 0) return true; // Unknown modifier.
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switch (ExtraCode[0]) {
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default: return true; // Unknown modifier.
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case 'c': // Don't print "$" before a global var name or constant.
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// PPC never has a prefix.
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printOperand(MI, OpNo);
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return false;
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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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case 'I':
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// Write 'i' if an integer constant, otherwise nothing. Used to print
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// addi vs add, etc.
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if (MI->getOperand(OpNo).isImm())
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O << "i";
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return false;
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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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if (MI->getOperand(OpNo).isRegister())
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printMemRegReg(MI, OpNo);
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else
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printMemRegImm(MI, OpNo);
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return false;
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}
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void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
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const char *Modifier) {
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assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
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unsigned Code = MI->getOperand(OpNo).getImm();
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if (!strcmp(Modifier, "cc")) {
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switch ((PPC::Predicate)Code) {
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case PPC::PRED_ALWAYS: return; // Don't print anything for always.
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case PPC::PRED_LT: O << "lt"; return;
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case PPC::PRED_LE: O << "le"; return;
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case PPC::PRED_EQ: O << "eq"; return;
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case PPC::PRED_GE: O << "ge"; return;
|
|
case PPC::PRED_GT: O << "gt"; return;
|
|
case PPC::PRED_NE: O << "ne"; return;
|
|
case PPC::PRED_UN: O << "un"; return;
|
|
case PPC::PRED_NU: O << "nu"; return;
|
|
}
|
|
|
|
} else {
|
|
assert(!strcmp(Modifier, "reg") &&
|
|
"Need to specify 'cc' or 'reg' as predicate op modifier!");
|
|
// Don't print the register for 'always'.
|
|
if (Code == PPC::PRED_ALWAYS) return;
|
|
printOperand(MI, OpNo+1);
|
|
}
|
|
}
|
|
|
|
|
|
/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
|
|
/// the current output stream.
|
|
///
|
|
void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
|
|
++EmittedInsts;
|
|
|
|
// Check for slwi/srwi mnemonics.
|
|
if (MI->getOpcode() == PPC::RLWINM) {
|
|
bool FoundMnemonic = false;
|
|
unsigned char SH = MI->getOperand(2).getImmedValue();
|
|
unsigned char MB = MI->getOperand(3).getImmedValue();
|
|
unsigned char ME = MI->getOperand(4).getImmedValue();
|
|
if (SH <= 31 && MB == 0 && ME == (31-SH)) {
|
|
O << "slwi "; FoundMnemonic = true;
|
|
}
|
|
if (SH <= 31 && MB == (32-SH) && ME == 31) {
|
|
O << "srwi "; FoundMnemonic = true;
|
|
SH = 32-SH;
|
|
}
|
|
if (FoundMnemonic) {
|
|
printOperand(MI, 0);
|
|
O << ", ";
|
|
printOperand(MI, 1);
|
|
O << ", " << (unsigned int)SH << "\n";
|
|
return;
|
|
}
|
|
} else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
|
|
if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
|
|
O << "mr ";
|
|
printOperand(MI, 0);
|
|
O << ", ";
|
|
printOperand(MI, 1);
|
|
O << "\n";
|
|
return;
|
|
}
|
|
} else if (MI->getOpcode() == PPC::RLDICR) {
|
|
unsigned char SH = MI->getOperand(2).getImmedValue();
|
|
unsigned char ME = MI->getOperand(3).getImmedValue();
|
|
// rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
|
|
if (63-SH == ME) {
|
|
O << "sldi ";
|
|
printOperand(MI, 0);
|
|
O << ", ";
|
|
printOperand(MI, 1);
|
|
O << ", " << (unsigned int)SH << "\n";
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (printInstruction(MI))
|
|
return; // Printer was automatically generated
|
|
|
|
assert(0 && "Unhandled instruction in asm writer!");
|
|
abort();
|
|
return;
|
|
}
|
|
|
|
/// runOnMachineFunction - This uses the printMachineInstruction()
|
|
/// method to print assembly for each instruction.
|
|
///
|
|
bool LinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
|
|
DW.SetModuleInfo(&getAnalysis<MachineModuleInfo>());
|
|
|
|
SetupMachineFunction(MF);
|
|
O << "\n\n";
|
|
|
|
// Print out constants referenced by the function
|
|
EmitConstantPool(MF.getConstantPool());
|
|
|
|
// Print out labels for the function.
|
|
const Function *F = MF.getFunction();
|
|
SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
|
|
|
|
switch (F->getLinkage()) {
|
|
default: assert(0 && "Unknown linkage type!");
|
|
case Function::InternalLinkage: // Symbols default to internal.
|
|
break;
|
|
case Function::ExternalLinkage:
|
|
O << "\t.global\t" << CurrentFnName << '\n'
|
|
<< "\t.type\t" << CurrentFnName << ", @function\n";
|
|
break;
|
|
case Function::WeakLinkage:
|
|
case Function::LinkOnceLinkage:
|
|
O << "\t.global\t" << CurrentFnName << '\n';
|
|
O << "\t.weak\t" << CurrentFnName << '\n';
|
|
break;
|
|
}
|
|
|
|
if (F->hasHiddenVisibility())
|
|
if (const char *Directive = TAI->getHiddenDirective())
|
|
O << Directive << CurrentFnName << "\n";
|
|
|
|
EmitAlignment(2, 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);
|
|
}
|
|
}
|
|
|
|
O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << "\n";
|
|
|
|
// Print out jump tables referenced by the function.
|
|
EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
|
|
|
|
// Emit post-function debug information.
|
|
DW.EndFunction();
|
|
|
|
// We didn't modify anything.
|
|
return false;
|
|
}
|
|
|
|
bool LinuxAsmPrinter::doInitialization(Module &M) {
|
|
AsmPrinter::doInitialization(M);
|
|
|
|
// GNU as handles section names wrapped in quotes
|
|
Mang->setUseQuotes(true);
|
|
|
|
SwitchToTextSection(TAI->getTextSection());
|
|
|
|
// Emit initial debug information.
|
|
DW.BeginModule(&M);
|
|
return false;
|
|
}
|
|
|
|
bool LinuxAsmPrinter::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);
|
|
|
|
if (I->hasHiddenVisibility())
|
|
if (const char *Directive = TAI->getHiddenDirective())
|
|
O << Directive << name << "\n";
|
|
|
|
Constant *C = I->getInitializer();
|
|
unsigned Size = TD->getTypeSize(C->getType());
|
|
unsigned Align = TD->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.global " << name << '\n';
|
|
O << "\t.type " << name << ", @object\n";
|
|
//O << "\t.zerofill __DATA, __common, " << name << ", "
|
|
// << Size << ", " << Align;
|
|
} else if (I->hasInternalLinkage()) {
|
|
SwitchToDataSection("\t.data", I);
|
|
O << TAI->getLCOMMDirective() << name << "," << Size;
|
|
} else {
|
|
SwitchToDataSection("\t.data", I);
|
|
O << ".comm " << name << "," << Size;
|
|
}
|
|
O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n";
|
|
} else {
|
|
switch (I->getLinkage()) {
|
|
case GlobalValue::LinkOnceLinkage:
|
|
case GlobalValue::WeakLinkage:
|
|
O << "\t.global " << name << '\n'
|
|
<< "\t.type " << name << ", @object\n"
|
|
<< "\t.weak " << name << '\n';
|
|
SwitchToDataSection("\t.data", 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.global " << name << "\n"
|
|
<< "\t.type " << name << ", @object\n";
|
|
// FALL THROUGH
|
|
case GlobalValue::InternalLinkage:
|
|
if (I->isConstant()) {
|
|
const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
|
|
if (TAI->getCStringSection() && CVA && CVA->isCString()) {
|
|
SwitchToDataSection(TAI->getCStringSection(), I);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// FIXME: special handling for ".ctors" & ".dtors" sections
|
|
if (I->hasSection() &&
|
|
(I->getSection() == ".ctors" ||
|
|
I->getSection() == ".dtors")) {
|
|
std::string SectionName = ".section " + I->getSection()
|
|
+ ",\"aw\",@progbits";
|
|
SwitchToDataSection(SectionName.c_str());
|
|
} else {
|
|
if (I->isConstant() && TAI->getReadOnlySection())
|
|
SwitchToDataSection(TAI->getReadOnlySection(), I);
|
|
else
|
|
SwitchToDataSection(TAI->getDataSection(), I);
|
|
}
|
|
break;
|
|
default:
|
|
cerr << "Unknown linkage type!";
|
|
abort();
|
|
}
|
|
|
|
EmitAlignment(Align, I);
|
|
O << name << ":\t\t\t\t" << TAI->getCommentString() << " '"
|
|
<< I->getName() << "'\n";
|
|
|
|
// If the initializer is a extern weak symbol, remember to emit the weak
|
|
// reference!
|
|
if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
|
|
if (GV->hasExternalWeakLinkage())
|
|
ExtWeakSymbols.insert(GV);
|
|
|
|
EmitGlobalConstant(C);
|
|
O << '\n';
|
|
}
|
|
}
|
|
|
|
// TODO
|
|
|
|
// Emit initial debug information.
|
|
DW.EndModule();
|
|
|
|
AsmPrinter::doFinalization(M);
|
|
return false; // success
|
|
}
|
|
|
|
std::string LinuxAsmPrinter::getSectionForFunction(const Function &F) const {
|
|
switch (F.getLinkage()) {
|
|
default: assert(0 && "Unknown linkage type!");
|
|
case Function::ExternalLinkage:
|
|
case Function::InternalLinkage: return TAI->getTextSection();
|
|
case Function::WeakLinkage:
|
|
case Function::LinkOnceLinkage:
|
|
return ".text";
|
|
}
|
|
}
|
|
|
|
std::string DarwinAsmPrinter::getSectionForFunction(const Function &F) const {
|
|
switch (F.getLinkage()) {
|
|
default: assert(0 && "Unknown linkage type!");
|
|
case Function::ExternalLinkage:
|
|
case Function::InternalLinkage: return TAI->getTextSection();
|
|
case Function::WeakLinkage:
|
|
case Function::LinkOnceLinkage:
|
|
return ".section __TEXT,__textcoal_nt,coalesced,pure_instructions";
|
|
}
|
|
}
|
|
|
|
/// runOnMachineFunction - This uses the printMachineInstruction()
|
|
/// method to print assembly for each instruction.
|
|
///
|
|
bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
|
|
DW.SetModuleInfo(&getAnalysis<MachineModuleInfo>());
|
|
|
|
SetupMachineFunction(MF);
|
|
O << "\n\n";
|
|
|
|
// Print out constants referenced by the function
|
|
EmitConstantPool(MF.getConstantPool());
|
|
|
|
// Print out labels for the function.
|
|
const Function *F = MF.getFunction();
|
|
SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
|
|
|
|
switch (F->getLinkage()) {
|
|
default: assert(0 && "Unknown linkage type!");
|
|
case Function::InternalLinkage: // Symbols default to internal.
|
|
break;
|
|
case Function::ExternalLinkage:
|
|
O << "\t.globl\t" << CurrentFnName << "\n";
|
|
break;
|
|
case Function::WeakLinkage:
|
|
case Function::LinkOnceLinkage:
|
|
O << "\t.globl\t" << CurrentFnName << "\n";
|
|
O << "\t.weak_definition\t" << CurrentFnName << "\n";
|
|
break;
|
|
}
|
|
|
|
if (F->hasHiddenVisibility())
|
|
if (const char *Directive = TAI->getHiddenDirective())
|
|
O << Directive << CurrentFnName << "\n";
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
// Print out jump tables referenced by the function.
|
|
EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
|
|
|
|
// Emit post-function debug information.
|
|
DW.EndFunction();
|
|
|
|
// We didn't modify anything.
|
|
return false;
|
|
}
|
|
|
|
|
|
bool DarwinAsmPrinter::doInitialization(Module &M) {
|
|
static const char *CPUDirectives[] = {
|
|
"ppc",
|
|
"ppc601",
|
|
"ppc602",
|
|
"ppc603",
|
|
"ppc7400",
|
|
"ppc750",
|
|
"ppc970",
|
|
"ppc64"
|
|
};
|
|
|
|
unsigned Directive = Subtarget.getDarwinDirective();
|
|
if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
|
|
Directive = PPC::DIR_970;
|
|
if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
|
|
Directive = PPC::DIR_7400;
|
|
if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
|
|
Directive = PPC::DIR_64;
|
|
assert(Directive <= PPC::DIR_64 && "Directive out of range.");
|
|
O << "\t.machine " << CPUDirectives[Directive] << "\n";
|
|
|
|
AsmPrinter::doInitialization(M);
|
|
|
|
// Darwin wants symbols to be quoted if they have complex names.
|
|
Mang->setUseQuotes(true);
|
|
|
|
// Prime text sections so they are adjacent. This reduces the likelihood a
|
|
// large data or debug section causes a branch to exceed 16M limit.
|
|
SwitchToTextSection(".section __TEXT,__textcoal_nt,coalesced,"
|
|
"pure_instructions");
|
|
if (TM.getRelocationModel() == Reloc::PIC_) {
|
|
SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
|
|
"pure_instructions,32");
|
|
} else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
|
|
SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
|
|
"pure_instructions,16");
|
|
}
|
|
SwitchToTextSection(TAI->getTextSection());
|
|
|
|
// 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)) {
|
|
if (TM.getRelocationModel() == Reloc::Static) {
|
|
if (I->getName() == "llvm.global_ctors")
|
|
O << ".reference .constructors_used\n";
|
|
else if (I->getName() == "llvm.global_dtors")
|
|
O << ".reference .destructors_used\n";
|
|
}
|
|
continue;
|
|
}
|
|
|
|
std::string name = Mang->getValueName(I);
|
|
|
|
if (I->hasHiddenVisibility())
|
|
if (const char *Directive = TAI->getHiddenDirective())
|
|
O << Directive << name << "\n";
|
|
|
|
Constant *C = I->getInitializer();
|
|
const Type *Type = C->getType();
|
|
unsigned Size = TD->getTypeSize(Type);
|
|
unsigned Align = TD->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 << TAI->getLCOMMDirective() << name << "," << Size << "," << Align;
|
|
} else {
|
|
SwitchToDataSection("\t.data", I);
|
|
O << ".comm " << name << "," << Size;
|
|
}
|
|
O << "\t\t" << TAI->getCommentString() << " '" << 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:
|
|
if (I->isConstant()) {
|
|
const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
|
|
if (TAI->getCStringSection() && CVA && CVA->isCString()) {
|
|
SwitchToDataSection(TAI->getCStringSection(), I);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!I->isConstant())
|
|
SwitchToDataSection(TAI->getDataSection(), I);
|
|
else {
|
|
// Read-only data.
|
|
bool HasReloc = C->ContainsRelocations();
|
|
if (HasReloc &&
|
|
TM.getRelocationModel() != Reloc::Static)
|
|
SwitchToDataSection("\t.const_data\n");
|
|
else if (!HasReloc && Size == 4 &&
|
|
TAI->getFourByteConstantSection())
|
|
SwitchToDataSection(TAI->getFourByteConstantSection(), I);
|
|
else if (!HasReloc && Size == 8 &&
|
|
TAI->getEightByteConstantSection())
|
|
SwitchToDataSection(TAI->getEightByteConstantSection(), I);
|
|
else if (!HasReloc && Size == 16 &&
|
|
TAI->getSixteenByteConstantSection())
|
|
SwitchToDataSection(TAI->getSixteenByteConstantSection(), I);
|
|
else if (TAI->getReadOnlySection())
|
|
SwitchToDataSection(TAI->getReadOnlySection(), I);
|
|
else
|
|
SwitchToDataSection(TAI->getDataSection(), I);
|
|
}
|
|
break;
|
|
default:
|
|
cerr << "Unknown linkage type!";
|
|
abort();
|
|
}
|
|
|
|
EmitAlignment(Align, I);
|
|
O << name << ":\t\t\t\t" << TAI->getCommentString() << " '"
|
|
<< I->getName() << "'\n";
|
|
|
|
// If the initializer is a extern weak symbol, remember to emit the weak
|
|
// reference!
|
|
if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
|
|
if (GV->hasExternalWeakLinkage())
|
|
ExtWeakSymbols.insert(GV);
|
|
|
|
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");
|
|
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$" << *i << ")(r11)\n";
|
|
O << "\tmtctr r12\n";
|
|
O << "\tbctr\n";
|
|
SwitchToDataSection(".lazy_symbol_pointer");
|
|
O << "L" << *i << "$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");
|
|
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");
|
|
O << "L" << *i << "$lazy_ptr:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
if (isPPC64)
|
|
O << "\t.quad dyld_stub_binding_helper\n";
|
|
else
|
|
O << "\t.long dyld_stub_binding_helper\n";
|
|
}
|
|
}
|
|
|
|
O << "\n";
|
|
|
|
// Output stubs for external and common global variables.
|
|
if (GVStubs.begin() != GVStubs.end()) {
|
|
SwitchToDataSection(".non_lazy_symbol_pointer");
|
|
for (std::set<std::string>::iterator I = GVStubs.begin(),
|
|
E = GVStubs.end(); I != E; ++I) {
|
|
O << "L" << *I << "$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
|
|
}
|
|
|
|
|
|
|
|
/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
|
|
/// for a MachineFunction to the given output stream, in a format that the
|
|
/// Darwin assembler can deal with.
|
|
///
|
|
FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o,
|
|
PPCTargetMachine &tm) {
|
|
const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
|
|
|
|
if (Subtarget->isDarwin()) {
|
|
return new DarwinAsmPrinter(o, tm, tm.getTargetAsmInfo());
|
|
} else {
|
|
return new LinuxAsmPrinter(o, tm, tm.getTargetAsmInfo());
|
|
}
|
|
}
|
|
|