mirror of
https://github.com/c64scene-ar/llvm-6502.git
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972f5896e4
- Modifications from the last patch included (issues pointed by Evan Cheng are now fixed). - Added more MipsI instructions. - Added more patterns to match branch instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37461 91177308-0d34-0410-b5e6-96231b3b80d8
295 lines
9.0 KiB
C++
295 lines
9.0 KiB
C++
//===-- MipsAsmPrinter.cpp - Mips LLVM assembly writer --------------------===//
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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 Bruno Cardoso Lopes and is distributed under the
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// 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 GAS-format MIPS assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "mips-asm-printer"
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#include "Mips.h"
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#include "MipsInstrInfo.h"
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#include "MipsTargetMachine.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/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/MathExtras.h"
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#include <cctype>
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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 MipsAsmPrinter : public AsmPrinter {
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MipsAsmPrinter(std::ostream &O, MipsTargetMachine &TM,
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const TargetAsmInfo *T):
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AsmPrinter(O, TM, T) {}
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virtual const char *getPassName() const {
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return "Mips Assembly Printer";
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}
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void printOperand(const MachineInstr *MI, int opNum);
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void printMemOperand(const MachineInstr *MI, int opNum,
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const char *Modifier = 0);
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bool printInstruction(const MachineInstr *MI); // autogenerated.
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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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};
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} // end of anonymous namespace
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#include "MipsGenAsmWriter.inc"
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/// createMipsCodePrinterPass - Returns a pass that prints the MIPS
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/// assembly code for a MachineFunction to the given output stream,
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/// using the given target machine description. This should work
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/// regardless of whether the function is in SSA form.
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FunctionPass *llvm::createMipsCodePrinterPass(std::ostream &o,
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MipsTargetMachine &tm)
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{
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return new MipsAsmPrinter(o, tm, tm.getTargetAsmInfo());
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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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bool MipsAsmPrinter::
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runOnMachineFunction(MachineFunction &MF)
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{
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SetupMachineFunction(MF);
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// Print out constants referenced by the function
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EmitConstantPool(MF.getConstantPool());
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O << "\n\n";
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// What's my mangled name?
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CurrentFnName = Mang->getValueName(MF.getFunction());
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// Print out the label for the function.
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const Function *F = MF.getFunction();
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SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
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// On Mips GAS if .align #n is present, #n means the number of bits
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// to be cleared to align. So, if we want 4 byte alignment, we must
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// have .align 2
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// TODO:
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// add gas ".mask" and ".fmask"
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EmitAlignment(1, F);
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O << "\t.globl\t" << CurrentFnName << "\n";
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O << "\t.ent\t" << CurrentFnName << "\n";
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O << "\t.type\t" << CurrentFnName << ", @function\n";
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O << CurrentFnName << ":\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.
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if (I != MF.begin()) {
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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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O << "\t";
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printInstruction(II);
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++EmittedInsts;
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}
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}
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// close function with asm directive
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O << "\t.end\t" << CurrentFnName << "\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 MipsAsmPrinter::
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printOperand(const MachineInstr *MI, int opNum)
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{
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const MachineOperand &MO = MI->getOperand(opNum);
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const MRegisterInfo &RI = *TM.getRegisterInfo();
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bool closeP=false;
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// %hi and %lo used on mips gas to break large constants
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if (MI->getOpcode() == Mips::LUi && !MO.isRegister()
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&& !MO.isImmediate()) {
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O << "%hi(";
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closeP = true;
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} else if ((MI->getOpcode() == Mips::ADDiu) && !MO.isRegister()
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&& !MO.isImmediate()) {
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O << "%lo(";
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closeP = true;
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}
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switch (MO.getType())
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{
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case MachineOperand::MO_Register:
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if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
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O << "$" << LowercaseString (RI.get(MO.getReg()).Name);
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else
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O << "$" << MO.getReg();
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break;
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case MachineOperand::MO_Immediate:
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if ((MI->getOpcode() == Mips::SLTiu) || (MI->getOpcode() == Mips::ORi) ||
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(MI->getOpcode() == Mips::LUi) || (MI->getOpcode() == Mips::ANDi))
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O << (unsigned int)MO.getImmedValue();
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else
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O << (int)MO.getImmedValue();
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break;
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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_GlobalAddress:
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O << Mang->getValueName(MO.getGlobal());
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break;
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case MachineOperand::MO_ExternalSymbol:
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O << MO.getSymbolName();
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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O << TAI->getPrivateGlobalPrefix() << "CPI"
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<< getFunctionNumber() << "_" << MO.getConstantPoolIndex();
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break;
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default:
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O << "<unknown operand type>"; abort (); break;
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}
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if (closeP) O << ")";
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}
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void MipsAsmPrinter::
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printMemOperand(const MachineInstr *MI, int opNum, const char *Modifier)
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{
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// lw/sw $reg, MemOperand
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// will turn into :
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// lw/sw $reg, imm($reg)
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printOperand(MI, opNum);
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O << "(";
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printOperand(MI, opNum+1);
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O << ")";
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}
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bool MipsAsmPrinter::
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doInitialization(Module &M)
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{
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Mang = new Mangler(M);
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return false; // success
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}
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bool MipsAsmPrinter::
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doFinalization(Module &M)
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{
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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(),
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E = M.global_end(); I != E; ++I)
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// External global require no code
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if (I->hasInitializer()) {
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// Check to see if this is a special global
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// used by LLVM, if so, emit it.
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if (EmitSpecialLLVMGlobal(I))
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continue;
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O << "\n\n";
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std::string name = Mang->getValueName(I);
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Constant *C = I->getInitializer();
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unsigned Size = TD->getTypeSize(C->getType());
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unsigned Align = TD->getPrefTypeAlignment(C->getType());
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if (C->isNullValue() && (I->hasLinkOnceLinkage() ||
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I->hasInternalLinkage() || I->hasWeakLinkage()
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/* FIXME: Verify correct */)) {
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SwitchToDataSection(".data", I);
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if (I->hasInternalLinkage())
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O << "\t.local " << name << "\n";
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O << "\t.comm " << name << ","
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<< TD->getTypeSize(C->getType())
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<< "," << Align << "\n";
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} else {
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switch (I->getLinkage())
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{
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage:
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// FIXME: Verify correct for weak.
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// Nonnull linkonce -> weak
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O << "\t.weak " << name << "\n";
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SwitchToDataSection("", I);
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O << "\t.section\t\".llvm.linkonce.d." << name
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<< "\",\"aw\",@progbits\n";
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break;
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case GlobalValue::AppendingLinkage:
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// FIXME: appending linkage variables
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// should go into a section of their name or
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// something. For now, just emit them as external.
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case GlobalValue::ExternalLinkage:
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// If external or appending, declare as a global symbol
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O << "\t.globl " << name << "\n";
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case GlobalValue::InternalLinkage:
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if (C->isNullValue())
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SwitchToDataSection(".bss", I);
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else
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SwitchToDataSection(".data", I);
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break;
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case GlobalValue::GhostLinkage:
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cerr << "Should not have any"
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<< "unmaterialized functions!\n";
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abort();
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case GlobalValue::DLLImportLinkage:
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cerr << "DLLImport linkage is"
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<< "not supported by this target!\n";
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abort();
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case GlobalValue::DLLExportLinkage:
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cerr << "DLLExport linkage is"
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<< "not supported by this target!\n";
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abort();
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default:
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assert(0 && "Unknown linkage type!");
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}
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O << "\t.align " << Align << "\n";
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O << "\t.type " << name << ",@object\n";
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O << "\t.size " << name << "," << Size << "\n";
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O << name << ":\n";
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EmitGlobalConstant(C);
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}
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}
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AsmPrinter::doFinalization(M);
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return false; // success
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}
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