mirror of
https://github.com/c64scene-ar/llvm-6502.git
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98a366d547
which better identifies what the optimization is doing. And is more flexible for future uses. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70440 91177308-0d34-0410-b5e6-96231b3b80d8
356 lines
11 KiB
C++
356 lines
11 KiB
C++
//===-- SparcAsmPrinter.cpp - Sparc 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 GAS-format SPARC assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "Sparc.h"
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#include "SparcInstrInfo.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/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/Support/raw_ostream.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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#include <cstring>
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#include <map>
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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 SparcAsmPrinter : public AsmPrinter {
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/// We name each basic block in a Function with a unique number, so
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/// that we can consistently refer to them later. This is cleared
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/// at the beginning of each call to runOnMachineFunction().
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///
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typedef std::map<const Value *, unsigned> ValueMapTy;
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ValueMapTy NumberForBB;
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public:
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explicit SparcAsmPrinter(raw_ostream &O, TargetMachine &TM,
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const TargetAsmInfo *T, CodeGenOpt::Level OL,
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bool V)
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: AsmPrinter(O, TM, T, OL, V) {}
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virtual const char *getPassName() const {
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return "Sparc Assembly Printer";
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}
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void printModuleLevelGV(const GlobalVariable* GVar);
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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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void printCCOperand(const MachineInstr *MI, int opNum);
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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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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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};
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} // end of anonymous namespace
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#include "SparcGenAsmWriter.inc"
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/// createSparcCodePrinterPass - Returns a pass that prints the SPARC
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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::createSparcCodePrinterPass(raw_ostream &o,
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TargetMachine &tm,
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CodeGenOpt::Level OptLevel,
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bool verbose) {
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return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
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}
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/// runOnMachineFunction - This uses the printInstruction()
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/// method to print assembly for each instruction.
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///
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bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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this->MF = &MF;
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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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// BBNumber is used here so that a given Printer will never give two
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// BBs the same name. (If you have a better way, please let me know!)
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static unsigned BBNumber = 0;
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O << "\n\n";
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// Print out the label for the function.
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const Function *F = MF.getFunction();
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SwitchToSection(TAI->SectionForGlobal(F));
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EmitAlignment(4, F);
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O << "\t.globl\t" << CurrentFnName << '\n';
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printVisibility(CurrentFnName, F->getVisibility());
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O << "\t.type\t" << CurrentFnName << ", #function\n";
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O << CurrentFnName << ":\n";
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// Number each basic block so that we can consistently refer to them
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// in PC-relative references.
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// FIXME: Why not use the MBB numbers?
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NumberForBB.clear();
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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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NumberForBB[I->getBasicBlock()] = BBNumber++;
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}
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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, 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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printInstruction(II);
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++EmittedInsts;
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}
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}
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// We didn't modify anything.
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return false;
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}
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void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
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const MachineOperand &MO = MI->getOperand (opNum);
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const TargetRegisterInfo &RI = *TM.getRegisterInfo();
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bool CloseParen = false;
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if (MI->getOpcode() == SP::SETHIi && !MO.isReg() && !MO.isImm()) {
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O << "%hi(";
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CloseParen = true;
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} else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri) &&
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!MO.isReg() && !MO.isImm()) {
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O << "%lo(";
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CloseParen = true;
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}
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
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O << "%" << LowercaseString (RI.get(MO.getReg()).AsmName);
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else
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O << "%reg" << MO.getReg();
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break;
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case MachineOperand::MO_Immediate:
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O << (int)MO.getImm();
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break;
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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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{
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const GlobalValue *GV = MO.getGlobal();
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O << Mang->getValueName(GV);
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}
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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" << getFunctionNumber() << "_"
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<< MO.getIndex();
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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 (CloseParen) O << ")";
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}
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void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
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const char *Modifier) {
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printOperand(MI, opNum);
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// If this is an ADD operand, emit it like normal operands.
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if (Modifier && !strcmp(Modifier, "arith")) {
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O << ", ";
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printOperand(MI, opNum+1);
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return;
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}
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if (MI->getOperand(opNum+1).isReg() &&
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MI->getOperand(opNum+1).getReg() == SP::G0)
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return; // don't print "+%g0"
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if (MI->getOperand(opNum+1).isImm() &&
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MI->getOperand(opNum+1).getImm() == 0)
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return; // don't print "+0"
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O << "+";
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if (MI->getOperand(opNum+1).isGlobal() ||
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MI->getOperand(opNum+1).isCPI()) {
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O << "%lo(";
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printOperand(MI, opNum+1);
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O << ")";
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} else {
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printOperand(MI, opNum+1);
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}
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}
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void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
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int CC = (int)MI->getOperand(opNum).getImm();
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O << SPARCCondCodeToString((SPCC::CondCodes)CC);
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}
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bool SparcAsmPrinter::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 SparcAsmPrinter::doFinalization(Module &M) {
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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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printModuleLevelGV(I);
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O << '\n';
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return AsmPrinter::doFinalization(M);
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}
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void SparcAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
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const TargetData *TD = TM.getTargetData();
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if (!GVar->hasInitializer())
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return; // 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(GVar))
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return;
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O << "\n\n";
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std::string name = Mang->getValueName(GVar);
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Constant *C = GVar->getInitializer();
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unsigned Size = TD->getTypePaddedSize(C->getType());
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unsigned Align = TD->getPreferredAlignment(GVar);
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printVisibility(name, GVar->getVisibility());
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SwitchToSection(TAI->SectionForGlobal(GVar));
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if (C->isNullValue() && !GVar->hasSection()) {
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if (!GVar->isThreadLocal() &&
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(GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
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if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
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if (GVar->hasLocalLinkage())
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O << "\t.local " << name << '\n';
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O << TAI->getCOMMDirective() << name << ',' << Size;
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if (TAI->getCOMMDirectiveTakesAlignment())
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O << ',' << (1 << Align);
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O << '\n';
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return;
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}
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}
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switch (GVar->getLinkage()) {
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case GlobalValue::CommonLinkage:
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case GlobalValue::LinkOnceAnyLinkage:
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case GlobalValue::LinkOnceODRLinkage:
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case GlobalValue::WeakAnyLinkage: // FIXME: Verify correct for weak.
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case GlobalValue::WeakODRLinkage: // 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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break;
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case GlobalValue::AppendingLinkage:
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// FIXME: appending linkage variables should go into a section of
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// their name or 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 << TAI->getGlobalDirective() << name << '\n';
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// FALL THROUGH
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case GlobalValue::PrivateLinkage:
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case GlobalValue::InternalLinkage:
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break;
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case GlobalValue::GhostLinkage:
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cerr << "Should not have any unmaterialized functions!\n";
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abort();
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case GlobalValue::DLLImportLinkage:
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cerr << "DLLImport linkage is 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 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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EmitAlignment(Align, GVar);
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if (TAI->hasDotTypeDotSizeDirective()) {
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O << "\t.type " << name << ",#object\n";
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O << "\t.size " << name << ',' << Size << '\n';
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}
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O << name << ":\n";
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EmitGlobalConstant(C);
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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 SparcAsmPrinter::PrintAsmOperand(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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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 'r':
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break;
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}
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}
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printOperand(MI, OpNo);
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return false;
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}
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bool SparcAsmPrinter::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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O << '[';
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printMemOperand(MI, OpNo);
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O << ']';
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return false;
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}
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