mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46667 91177308-0d34-0410-b5e6-96231b3b80d8
521 lines
16 KiB
C++
521 lines
16 KiB
C++
//===-- X86IntelAsmPrinter.cpp - Convert X86 LLVM code to Intel assembly --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// 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 Intel format assembly language.
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// This printer is the output mechanism used by `llc'.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "X86IntelAsmPrinter.h"
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#include "X86TargetAsmInfo.h"
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#include "X86.h"
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#include "llvm/CallingConv.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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STATISTIC(EmittedInsts, "Number of machine instrs printed");
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std::string X86IntelAsmPrinter::getSectionForFunction(const Function &F) const {
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// Intel asm always emits functions to _text.
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return "_text";
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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 X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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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 labels for the function.
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const Function *F = MF.getFunction();
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unsigned CC = F->getCallingConv();
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// Populate function information map. Actually, We don't want to populate
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// non-stdcall or non-fastcall functions' information right now.
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if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
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FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
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X86SharedAsmPrinter::decorateName(CurrentFnName, F);
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SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
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switch (F->getLinkage()) {
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default: assert(0 && "Unsupported linkage type!");
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case Function::InternalLinkage:
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EmitAlignment(4);
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break;
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case Function::DLLExportLinkage:
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DLLExportedFns.insert(CurrentFnName);
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//FALLS THROUGH
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case Function::ExternalLinkage:
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O << "\tpublic " << CurrentFnName << "\n";
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EmitAlignment(4);
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break;
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}
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O << CurrentFnName << "\tproc near\n";
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// Print out code for the function.
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for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
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I != E; ++I) {
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// Print a label for the basic block if there are any predecessors.
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if (!I->pred_empty()) {
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printBasicBlockLabel(I, true);
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O << '\n';
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}
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for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
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II != E; ++II) {
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// Print the assembly for the instruction.
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printMachineInstruction(II);
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}
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}
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// Print out jump tables referenced by the function.
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EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
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O << CurrentFnName << "\tendp\n";
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// We didn't modify anything.
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return false;
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}
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void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
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unsigned char value = MI->getOperand(Op).getImm();
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assert(value <= 7 && "Invalid ssecc argument!");
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switch (value) {
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case 0: O << "eq"; break;
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case 1: O << "lt"; break;
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case 2: O << "le"; break;
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case 3: O << "unord"; break;
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case 4: O << "neq"; break;
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case 5: O << "nlt"; break;
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case 6: O << "nle"; break;
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case 7: O << "ord"; break;
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}
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}
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void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
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const char *Modifier) {
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const MRegisterInfo &RI = *TM.getRegisterInfo();
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switch (MO.getType()) {
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case MachineOperand::MO_Register: {
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if (MRegisterInfo::isPhysicalRegister(MO.getReg())) {
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unsigned Reg = MO.getReg();
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if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
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MVT::ValueType VT = (strcmp(Modifier,"subreg64") == 0) ?
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MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
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((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
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Reg = getX86SubSuperRegister(Reg, VT);
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}
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O << RI.get(Reg).Name;
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} else
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O << "reg" << MO.getReg();
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return;
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}
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case MachineOperand::MO_Immediate:
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O << MO.getImm();
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return;
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case MachineOperand::MO_MachineBasicBlock:
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printBasicBlockLabel(MO.getMBB());
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return;
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case MachineOperand::MO_JumpTableIndex: {
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bool isMemOp = Modifier && !strcmp(Modifier, "mem");
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if (!isMemOp) O << "OFFSET ";
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O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
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<< "_" << MO.getIndex();
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return;
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}
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case MachineOperand::MO_ConstantPoolIndex: {
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bool isMemOp = Modifier && !strcmp(Modifier, "mem");
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if (!isMemOp) O << "OFFSET ";
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O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
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<< getFunctionNumber() << "_" << MO.getIndex();
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int Offset = MO.getOffset();
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if (Offset > 0)
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O << " + " << Offset;
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else if (Offset < 0)
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O << Offset;
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O << "]";
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return;
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}
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case MachineOperand::MO_GlobalAddress: {
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bool isCallOp = Modifier && !strcmp(Modifier, "call");
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bool isMemOp = Modifier && !strcmp(Modifier, "mem");
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GlobalValue *GV = MO.getGlobal();
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std::string Name = Mang->getValueName(GV);
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X86SharedAsmPrinter::decorateName(Name, GV);
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if (!isMemOp && !isCallOp) O << "OFFSET ";
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if (GV->hasDLLImportLinkage()) {
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// FIXME: This should be fixed with full support of stdcall & fastcall
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// CC's
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O << "__imp_";
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}
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O << Name;
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int Offset = MO.getOffset();
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if (Offset > 0)
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O << " + " << Offset;
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else if (Offset < 0)
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O << Offset;
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return;
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}
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case MachineOperand::MO_ExternalSymbol: {
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bool isCallOp = Modifier && !strcmp(Modifier, "call");
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if (!isCallOp) O << "OFFSET ";
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O << TAI->getGlobalPrefix() << MO.getSymbolName();
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return;
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}
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default:
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O << "<unknown operand type>"; return;
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}
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}
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void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
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const char *Modifier) {
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assert(isMem(MI, Op) && "Invalid memory reference!");
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const MachineOperand &BaseReg = MI->getOperand(Op);
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int ScaleVal = MI->getOperand(Op+1).getImm();
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const MachineOperand &IndexReg = MI->getOperand(Op+2);
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const MachineOperand &DispSpec = MI->getOperand(Op+3);
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O << "[";
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bool NeedPlus = false;
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if (BaseReg.getReg()) {
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printOp(BaseReg, Modifier);
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NeedPlus = true;
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}
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if (IndexReg.getReg()) {
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if (NeedPlus) O << " + ";
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if (ScaleVal != 1)
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O << ScaleVal << "*";
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printOp(IndexReg, Modifier);
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NeedPlus = true;
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}
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if (DispSpec.isGlobalAddress() || DispSpec.isConstantPoolIndex() ||
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DispSpec.isJumpTableIndex()) {
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if (NeedPlus)
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O << " + ";
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printOp(DispSpec, "mem");
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} else {
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int DispVal = DispSpec.getImm();
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if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
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if (NeedPlus)
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if (DispVal > 0)
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O << " + ";
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else {
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O << " - ";
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DispVal = -DispVal;
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}
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O << DispVal;
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}
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}
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O << "]";
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}
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void X86IntelAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
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const MachineBasicBlock *MBB) const {
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if (!TAI->getSetDirective())
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return;
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O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
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<< getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
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printBasicBlockLabel(MBB, false, false);
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O << '-' << "\"L" << getFunctionNumber() << "$pb\"'\n";
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}
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void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
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O << "\"L" << getFunctionNumber() << "$pb\"\n";
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O << "\"L" << getFunctionNumber() << "$pb\":";
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}
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bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
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const char Mode) {
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const MRegisterInfo &RI = *TM.getRegisterInfo();
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unsigned Reg = MO.getReg();
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switch (Mode) {
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default: return true; // Unknown mode.
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case 'b': // Print QImode register
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Reg = getX86SubSuperRegister(Reg, MVT::i8);
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break;
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case 'h': // Print QImode high register
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Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
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break;
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case 'w': // Print HImode register
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Reg = getX86SubSuperRegister(Reg, MVT::i16);
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break;
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case 'k': // Print SImode register
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Reg = getX86SubSuperRegister(Reg, MVT::i32);
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break;
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}
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O << '%' << RI.get(Reg).Name;
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return false;
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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 X86IntelAsmPrinter::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 'b': // Print QImode register
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case 'h': // Print QImode high register
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case 'w': // Print HImode register
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case 'k': // Print SImode register
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return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
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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 X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
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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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printMemReference(MI, OpNo);
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return false;
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}
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/// printMachineInstruction -- Print out a single X86 LLVM instruction
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/// MI in Intel syntax to the current output stream.
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///
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void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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++EmittedInsts;
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// See if a truncate instruction can be turned into a nop.
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switch (MI->getOpcode()) {
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default: break;
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case X86::PsMOVZX64rr32:
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O << TAI->getCommentString() << " ZERO-EXTEND " << "\n\t";
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break;
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}
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// Call the autogenerated instruction printer routines.
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printInstruction(MI);
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}
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bool X86IntelAsmPrinter::doInitialization(Module &M) {
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bool Result = X86SharedAsmPrinter::doInitialization(M);
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Mang->markCharUnacceptable('.');
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O << "\t.686\n\t.model flat\n\n";
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// Emit declarations for external functions.
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->isDeclaration()) {
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std::string Name = Mang->getValueName(I);
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X86SharedAsmPrinter::decorateName(Name, I);
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O << "\textern " ;
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if (I->hasDLLImportLinkage()) {
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O << "__imp_";
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}
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O << Name << ":near\n";
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}
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// Emit declarations for external globals. Note that VC++ always declares
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// external globals to have type byte, and if that's good enough for VC++...
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I) {
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if (I->isDeclaration()) {
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std::string Name = Mang->getValueName(I);
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O << "\textern " ;
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if (I->hasDLLImportLinkage()) {
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O << "__imp_";
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}
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O << Name << ":byte\n";
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}
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}
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return Result;
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}
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bool X86IntelAsmPrinter::doFinalization(Module &M) {
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const TargetData *TD = TM.getTargetData();
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// Print out module-level global variables here.
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I) {
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if (I->isDeclaration()) continue; // External global require no code
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// Check to see if this is a special global used by LLVM, if so, emit it.
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if (EmitSpecialLLVMGlobal(I))
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continue;
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std::string name = Mang->getValueName(I);
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Constant *C = I->getInitializer();
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unsigned Align = TD->getPreferredAlignmentLog(I);
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bool bCustomSegment = false;
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switch (I->getLinkage()) {
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage:
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SwitchToDataSection("");
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O << name << "?\tsegment common 'COMMON'\n";
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bCustomSegment = true;
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// FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
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// are also available.
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break;
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case GlobalValue::AppendingLinkage:
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SwitchToDataSection("");
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O << name << "?\tsegment public 'DATA'\n";
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bCustomSegment = true;
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// FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
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// are also available.
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break;
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case GlobalValue::DLLExportLinkage:
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DLLExportedGVs.insert(name);
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// FALL THROUGH
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case GlobalValue::ExternalLinkage:
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O << "\tpublic " << name << "\n";
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// FALL THROUGH
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case GlobalValue::InternalLinkage:
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SwitchToDataSection(TAI->getDataSection(), I);
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break;
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default:
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assert(0 && "Unknown linkage type!");
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}
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if (!bCustomSegment)
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EmitAlignment(Align, I);
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O << name << ":\t\t\t\t" << TAI->getCommentString()
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<< " " << I->getName() << '\n';
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EmitGlobalConstant(C);
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if (bCustomSegment)
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O << name << "?\tends\n";
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}
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// Output linker support code for dllexported globals
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if (!DLLExportedGVs.empty() ||
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!DLLExportedFns.empty()) {
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SwitchToDataSection("");
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O << "; WARNING: The following code is valid only with MASM v8.x and (possible) higher\n"
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<< "; This version of MASM is usually shipped with Microsoft Visual Studio 2005\n"
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<< "; or (possible) further versions. Unfortunately, there is no way to support\n"
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<< "; dllexported symbols in the earlier versions of MASM in fully automatic way\n\n";
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O << "_drectve\t segment info alias('.drectve')\n";
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}
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for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
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e = DLLExportedGVs.end();
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i != e; ++i) {
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O << "\t db ' /EXPORT:" << *i << ",data'\n";
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}
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for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
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e = DLLExportedFns.end();
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i != e; ++i) {
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O << "\t db ' /EXPORT:" << *i << "'\n";
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}
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if (!DLLExportedGVs.empty() ||
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!DLLExportedFns.empty()) {
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O << "_drectve\t ends\n";
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}
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// Bypass X86SharedAsmPrinter::doFinalization().
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bool Result = AsmPrinter::doFinalization(M);
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SwitchToDataSection("");
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O << "\tend\n";
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return Result;
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}
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void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
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unsigned NumElts = CVA->getNumOperands();
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if (NumElts) {
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// ML does not have escape sequences except '' for '. It also has a maximum
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// string length of 255.
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unsigned len = 0;
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bool inString = false;
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for (unsigned i = 0; i < NumElts; i++) {
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int n = cast<ConstantInt>(CVA->getOperand(i))->getZExtValue() & 255;
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if (len == 0)
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O << "\tdb ";
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if (n >= 32 && n <= 127) {
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if (!inString) {
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if (len > 0) {
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O << ",'";
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len += 2;
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} else {
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O << "'";
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len++;
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}
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inString = true;
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}
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if (n == '\'') {
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O << "'";
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len++;
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}
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O << char(n);
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} else {
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if (inString) {
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O << "'";
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len++;
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inString = false;
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}
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if (len > 0) {
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O << ",";
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len++;
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}
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O << n;
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len += 1 + (n > 9) + (n > 99);
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}
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if (len > 60) {
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if (inString) {
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O << "'";
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inString = false;
|
|
}
|
|
O << "\n";
|
|
len = 0;
|
|
}
|
|
}
|
|
|
|
if (len > 0) {
|
|
if (inString)
|
|
O << "'";
|
|
O << "\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
// Include the auto-generated portion of the assembly writer.
|
|
#include "X86GenAsmWriter1.inc"
|