mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70769 91177308-0d34-0410-b5e6-96231b3b80d8
268 lines
7.9 KiB
C++
268 lines
7.9 KiB
C++
//===-- MSP430AsmPrinter.cpp - MSP430 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 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 the MSP430 assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "MSP430.h"
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#include "MSP430InstrInfo.h"
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#include "MSP430TargetMachine.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/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/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/ADT/Statistic.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/raw_ostream.h"
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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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class VISIBILITY_HIDDEN MSP430AsmPrinter : public AsmPrinter {
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public:
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MSP430AsmPrinter(raw_ostream &O, MSP430TargetMachine &TM,
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const TargetAsmInfo *TAI,
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CodeGenOpt::Level OL, bool V)
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: AsmPrinter(O, TM, TAI, OL, V) {}
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virtual const char *getPassName() const {
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return "MSP430 Assembly Printer";
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}
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void printOperand(const MachineInstr *MI, int OpNum,
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const char* Modifier = 0);
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void printSrcMemOperand(const MachineInstr *MI, int OpNum,
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const char* Modifier = 0);
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void printCCOperand(const MachineInstr *MI, int OpNum);
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bool printInstruction(const MachineInstr *MI); // autogenerated.
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void printMachineInstruction(const MachineInstr * MI);
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void emitFunctionHeader(const MachineFunction &MF);
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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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AsmPrinter::getAnalysisUsage(AU);
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AU.setPreservesAll();
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}
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};
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} // end of anonymous namespace
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#include "MSP430GenAsmWriter.inc"
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/// createMSP430CodePrinterPass - Returns a pass that prints the MSP430
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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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///
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FunctionPass *llvm::createMSP430CodePrinterPass(raw_ostream &o,
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MSP430TargetMachine &tm,
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CodeGenOpt::Level OptLevel,
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bool verbose) {
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return new MSP430AsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
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}
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bool MSP430AsmPrinter::doInitialization(Module &M) {
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Mang = new Mangler(M, "", TAI->getPrivateGlobalPrefix());
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return false; // success
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}
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bool MSP430AsmPrinter::doFinalization(Module &M) {
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return AsmPrinter::doFinalization(M);
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}
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void MSP430AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
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const Function *F = MF.getFunction();
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SwitchToSection(TAI->SectionForGlobal(F));
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unsigned FnAlign = 4;
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if (F->hasFnAttr(Attribute::OptimizeForSize))
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FnAlign = 1;
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EmitAlignment(FnAlign, F);
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switch (F->getLinkage()) {
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default: assert(0 && "Unknown linkage type!");
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case Function::InternalLinkage: // Symbols default to internal.
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case Function::PrivateLinkage:
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break;
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case Function::ExternalLinkage:
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O << "\t.globl\t" << CurrentFnName << '\n';
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break;
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case Function::LinkOnceAnyLinkage:
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case Function::LinkOnceODRLinkage:
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case Function::WeakAnyLinkage:
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case Function::WeakODRLinkage:
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O << "\t.weak\t" << CurrentFnName << '\n';
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break;
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}
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printVisibility(CurrentFnName, F->getVisibility());
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O << "\t.type\t" << CurrentFnName << ",@function\n"
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<< CurrentFnName << ":\n";
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}
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bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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SetupMachineFunction(MF);
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O << "\n\n";
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// Print the 'header' of function
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emitFunctionHeader(MF);
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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 (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
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// This is an entry block or a block that's only reachable via a
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// fallthrough edge. In non-VerboseAsm mode, don't print the label.
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} else {
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printBasicBlockLabel(I, true, true, VerboseAsm);
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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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if (TAI->hasDotTypeDotSizeDirective())
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O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
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O.flush();
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// We didn't modify anything
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return false;
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}
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void MSP430AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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++EmittedInsts;
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// Call the autogenerated instruction printer routines.
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if (printInstruction(MI))
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return;
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assert(0 && "Should not happen");
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}
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void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
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const char* Modifier) {
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const MachineOperand &MO = MI->getOperand(OpNum);
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
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"Virtual registers should be already mapped!");
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O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
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return;
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case MachineOperand::MO_Immediate:
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if (!Modifier || strcmp(Modifier, "nohash"))
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O << '#';
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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_GlobalAddress: {
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bool isMemOp = Modifier && !strcmp(Modifier, "mem");
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bool isCallOp = Modifier && !strcmp(Modifier, "call");
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std::string Name = Mang->getValueName(MO.getGlobal());
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assert(MO.getOffset() == 0 && "No offsets allowed!");
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if (isCallOp)
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O << '#';
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else if (isMemOp)
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O << '&';
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O << Name;
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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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std::string Name(TAI->getGlobalPrefix());
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Name += MO.getSymbolName();
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if (isCallOp)
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O << '#';
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O << Name;
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return;
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}
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default:
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assert(0 && "Not implemented yet!");
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}
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}
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void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
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const char* Modifier) {
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const MachineOperand &Base = MI->getOperand(OpNum);
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const MachineOperand &Disp = MI->getOperand(OpNum+1);
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if (Base.isGlobal())
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printOperand(MI, OpNum, "mem");
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else if (Disp.isImm() && !Base.getReg())
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printOperand(MI, OpNum);
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else if (Base.getReg()) {
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if (Disp.getImm()) {
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printOperand(MI, OpNum + 1, "nohash");
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O << '(';
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printOperand(MI, OpNum);
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O << ')';
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} else {
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O << '@';
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printOperand(MI, OpNum);
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}
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} else
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assert(0 && "Unsupported memory operand");
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}
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void MSP430AsmPrinter::printCCOperand(const MachineInstr *MI, int OpNum) {
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unsigned CC = MI->getOperand(OpNum).getImm();
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switch (CC) {
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default:
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assert(0 && "Unsupported CC code");
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break;
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case MSP430::COND_E:
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O << "eq";
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break;
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case MSP430::COND_NE:
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O << "ne";
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break;
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case MSP430::COND_HS:
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O << "hs";
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break;
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case MSP430::COND_LO:
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O << "lo";
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break;
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case MSP430::COND_GE:
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O << "ge";
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break;
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case MSP430::COND_L:
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O << 'l';
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break;
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}
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}
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