mirror of
https://github.com/c64scene-ar/llvm-6502.git
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04f9674857
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26628 91177308-0d34-0410-b5e6-96231b3b80d8
291 lines
9.4 KiB
C++
291 lines
9.4 KiB
C++
//===-- AlphaAsmPrinter.cpp - Alpha 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 the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to GAS-format Alpha assembly language.
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//
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//===----------------------------------------------------------------------===//
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#include "Alpha.h"
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#include "AlphaInstrInfo.h"
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#include "AlphaTargetMachine.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/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 <iostream>
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using namespace llvm;
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namespace {
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Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
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struct AlphaAsmPrinter : public AsmPrinter {
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/// Unique incrementer for label values for referencing Global values.
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///
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unsigned LabelNumber;
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AlphaAsmPrinter(std::ostream &o, TargetMachine &tm)
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: AsmPrinter(o, tm), LabelNumber(0) {
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AlignmentIsInBytes = false;
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PrivateGlobalPrefix = "$";
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}
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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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std::string CurSection;
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virtual const char *getPassName() const {
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return "Alpha Assembly Printer";
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}
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bool printInstruction(const MachineInstr *MI);
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void printOp(const MachineOperand &MO, bool IsCallOp = false);
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void printOperand(const MachineInstr *MI, int opNum);
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void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
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void printMachineInstruction(const MachineInstr *MI);
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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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/// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
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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::createAlphaCodePrinterPass (std::ostream &o,
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TargetMachine &tm) {
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return new AlphaAsmPrinter(o, tm);
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}
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#include "AlphaGenAsmWriter.inc"
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void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
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{
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const MachineOperand &MO = MI->getOperand(opNum);
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if (MO.getType() == MachineOperand::MO_MachineRegister) {
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assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
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O << TM.getRegisterInfo()->get(MO.getReg()).Name;
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} else if (MO.isImmediate()) {
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O << MO.getImmedValue();
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} else {
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printOp(MO);
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}
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}
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void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
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const MRegisterInfo &RI = *TM.getRegisterInfo();
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int new_symbol;
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switch (MO.getType()) {
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case MachineOperand::MO_VirtualRegister:
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if (Value *V = MO.getVRegValueOrNull()) {
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O << "<" << V->getName() << ">";
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return;
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}
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// FALLTHROUGH
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case MachineOperand::MO_MachineRegister:
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case MachineOperand::MO_CCRegister:
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O << RI.get(MO.getReg()).Name;
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return;
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case MachineOperand::MO_SignExtendedImmed:
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case MachineOperand::MO_UnextendedImmed:
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std::cerr << "printOp() does not handle immediate values\n";
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abort();
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return;
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case MachineOperand::MO_PCRelativeDisp:
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std::cerr << "Shouldn't use addPCDisp() when building Alpha MachineInstrs";
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abort();
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return;
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case MachineOperand::MO_MachineBasicBlock: {
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MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
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O << PrivateGlobalPrefix << "LBB"
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<< Mang->getValueName(MBBOp->getParent()->getFunction())
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<< "_" << MBBOp->getNumber() << "\t" << CommentString << " "
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<< MBBOp->getBasicBlock()->getName();
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return;
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}
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case MachineOperand::MO_ConstantPoolIndex:
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O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
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<< MO.getConstantPoolIndex();
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return;
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case MachineOperand::MO_ExternalSymbol:
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O << MO.getSymbolName();
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return;
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case MachineOperand::MO_GlobalAddress:
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//Abuse PCrel to specify pcrel calls
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//calls are the only thing that use this flag
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// if (MO.isPCRelative())
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// O << PrivateGlobalPrefix << Mang->getValueName(MO.getGlobal()) << "..ng";
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// else
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O << Mang->getValueName(MO.getGlobal());
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return;
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default:
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O << "<unknown operand type: " << MO.getType() << ">";
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return;
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}
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}
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/// printMachineInstruction -- Print out a single Alpha MI to
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/// the current output stream.
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///
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void AlphaAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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++EmittedInsts;
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if (printInstruction(MI))
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return; // Printer was automatically generated
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assert(0 && "Unhandled instruction in asm writer!");
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abort();
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return;
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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 AlphaAsmPrinter::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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SwitchSection(".text", F);
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EmitAlignment(4, 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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break;
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case Function::ExternalLinkage:
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O << "\t.globl " << CurrentFnName << "\n";
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break;
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case Function::WeakLinkage:
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case Function::LinkOnceLinkage:
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O << "\t.weak " << CurrentFnName << "\n";
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break;
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}
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O << "\t.ent " << CurrentFnName << "\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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O << PrivateGlobalPrefix << "LBB" << CurrentFnName << "_" << I->getNumber()
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<< ":\t" << CommentString << " " << I->getBasicBlock()->getName() << "\n";
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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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printMachineInstruction(II);
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}
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}
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++LabelNumber;
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O << "\t.end " << 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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bool AlphaAsmPrinter::doInitialization(Module &M)
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{
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AsmPrinter::doInitialization(M);
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if(TM.getSubtarget<AlphaSubtarget>().hasF2I()
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|| TM.getSubtarget<AlphaSubtarget>().hasCT())
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O << "\t.arch ev6\n";
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else
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O << "\t.arch ev56\n";
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O << "\t.set noat\n";
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return false;
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}
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bool AlphaAsmPrinter::doFinalization(Module &M) {
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const TargetData &TD = TM.getTargetData();
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
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if (I->hasInitializer()) { // 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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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.getTypeAlignmentShift(C->getType());
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unsigned Align = getPreferredAlignmentLog(I);
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if (C->isNullValue() &&
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(I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
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I->hasWeakLinkage() /* FIXME: Verify correct */)) {
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SwitchSection("\t.section .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 << "," << TD.getTypeSize(C->getType())
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<< "," << (1 << Align)
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<< "\n";
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} else {
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switch (I->getLinkage()) {
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage: // 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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O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
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SwitchSection("", I);
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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 << "\t.globl " << name << "\n";
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// FALL THROUGH
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case GlobalValue::InternalLinkage:
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SwitchSection(C->isNullValue() ? "\t.section .bss" :
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"\t.section .data", I);
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break;
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case GlobalValue::GhostLinkage:
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std::cerr << "GhostLinkage cannot appear in AlphaAsmPrinter!\n";
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abort();
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}
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EmitAlignment(Align);
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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;
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}
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