forked from OSchip/llvm-project
283 lines
8.6 KiB
C++
283 lines
8.6 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 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 Alpha assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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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/Metadata.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/CodeGen/DwarfWriter.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/FormattedStream.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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namespace {
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struct VISIBILITY_HIDDEN AlphaAsmPrinter : public AsmPrinter {
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/// Unique incrementer for label values for referencing Global values.
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///
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explicit AlphaAsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
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const TargetAsmInfo *T, bool V)
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: AsmPrinter(o, tm, T, V) {}
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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 PrintGlobalVariable(const GlobalVariable *GVar);
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bool runOnMachineFunction(MachineFunction &F);
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bool doInitialization(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,
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unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode);
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};
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} // end of anonymous namespace
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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_Register) {
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assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
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"Not physreg??");
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O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
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} else if (MO.isImm()) {
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O << MO.getImm();
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assert(MO.getImm() < (1 << 30));
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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 TargetRegisterInfo &RI = *TM.getRegisterInfo();
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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O << RI.get(MO.getReg()).AsmName;
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return;
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case MachineOperand::MO_Immediate:
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llvm_unreachable("printOp() does not handle immediate values");
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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_ConstantPoolIndex:
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O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
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<< MO.getIndex();
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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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O << Mang->getMangledName(MO.getGlobal());
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return;
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case MachineOperand::MO_JumpTableIndex:
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O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
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<< '_' << MO.getIndex();
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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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/// 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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this->MF = &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 jump tables referenced by the function
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EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
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// Print out labels for the function.
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const Function *F = MF.getFunction();
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SwitchToSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
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EmitAlignment(MF.getAlignment(), F);
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switch (F->getLinkage()) {
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default: llvm_unreachable("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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case Function::LinkerPrivateLinkage:
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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::WeakAnyLinkage:
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case Function::WeakODRLinkage:
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case Function::LinkOnceAnyLinkage:
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case Function::LinkOnceODRLinkage:
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O << TAI->getWeakRefDirective() << 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.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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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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++EmittedInsts;
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if (!printInstruction(II)) {
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llvm_unreachable("Unhandled instruction in asm writer!");
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}
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}
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}
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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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if(TM.getSubtarget<AlphaSubtarget>().hasCT())
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O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
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else
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O << "\t.arch ev6\n";
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O << "\t.set noat\n";
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return AsmPrinter::doInitialization(M);
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}
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void AlphaAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
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const TargetData *TD = TM.getTargetData();
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if (!GVar->hasInitializer()) 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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std::string name = Mang->getMangledName(GVar);
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Constant *C = GVar->getInitializer();
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if (isa<MDNode>(C) || isa<MDString>(C))
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return;
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unsigned Size = TD->getTypeAllocSize(C->getType());
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unsigned Align = TD->getPreferredAlignmentLog(GVar);
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// 0: Switch to section
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SwitchToSection(getObjFileLowering().SectionForGlobal(GVar, Mang, TM));
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// 1: Check visibility
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printVisibility(name, GVar->getVisibility());
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// 2: Kind
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switch (GVar->getLinkage()) {
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case GlobalValue::LinkOnceAnyLinkage:
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case GlobalValue::LinkOnceODRLinkage:
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case GlobalValue::WeakAnyLinkage:
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case GlobalValue::WeakODRLinkage:
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case GlobalValue::CommonLinkage:
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O << TAI->getWeakRefDirective() << name << '\n';
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break;
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case GlobalValue::AppendingLinkage:
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case GlobalValue::ExternalLinkage:
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O << TAI->getGlobalDirective() << name << "\n";
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break;
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case GlobalValue::InternalLinkage:
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case GlobalValue::PrivateLinkage:
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case GlobalValue::LinkerPrivateLinkage:
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break;
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default:
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llvm_unreachable("Unknown linkage type!");
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}
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// 3: Type, Size, Align
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if (TAI->hasDotTypeDotSizeDirective()) {
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O << "\t.type\t" << name << ", @object\n";
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O << "\t.size\t" << name << ", " << Size << "\n";
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}
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EmitAlignment(Align, GVar);
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O << name << ":\n";
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EmitGlobalConstant(C);
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O << '\n';
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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 AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode) {
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printOperand(MI, OpNo);
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return false;
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}
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bool AlphaAsmPrinter::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 << "0(";
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printOperand(MI, OpNo);
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O << ")";
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return false;
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}
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// Force static initialization.
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extern "C" void LLVMInitializeAlphaAsmPrinter() {
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RegisterAsmPrinter<AlphaAsmPrinter> X(TheAlphaTarget);
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}
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