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https://github.com/c64scene-ar/llvm-6502.git
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are represented as "weak", but there are subtle differences in some cases on Darwin, so we need both. The intent is that "common" will behave identically to "weak" unless somebody changes their target to do something else. No functional change as yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51118 91177308-0d34-0410-b5e6-96231b3b80d8
297 lines
9.0 KiB
C++
297 lines
9.0 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/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/TargetAsmInfo.h"
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#include "llvm/Target/TargetMachine.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/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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AlphaAsmPrinter(std::ostream &o, TargetMachine &tm, const TargetAsmInfo *T)
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: AsmPrinter(o, tm, T) {
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}
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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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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,
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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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/// 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, tm.getTargetAsmInfo());
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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_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.isImmediate()) {
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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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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_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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GlobalValue *GV = MO.getGlobal();
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O << Mang->getValueName(GV);
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if (GV->isDeclaration() && GV->hasExternalWeakLinkage())
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ExtWeakSymbols.insert(GV);
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return;
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}
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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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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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SwitchToTextSection(getSectionForFunction(*F).c_str(), 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 << TAI->getWeakRefDirective() << 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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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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assert(0 && "Unhandled instruction in asm writer!");
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abort();
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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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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()) continue; // 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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std::string name = Mang->getValueName(I);
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Constant *C = I->getInitializer();
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unsigned Size = TD->getABITypeSize(C->getType());
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unsigned Align = TD->getPreferredAlignmentLog(I);
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//1: hidden?
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if (I->hasHiddenVisibility())
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O << TAI->getHiddenDirective() << name << "\n";
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//2: kind
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switch (I->getLinkage()) {
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage:
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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 << "\t.globl " << name << "\n";
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break;
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case GlobalValue::InternalLinkage:
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break;
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default:
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assert(0 && "Unknown linkage type!");
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cerr << "Unknown linkage type!\n";
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abort();
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}
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//3: Section (if changed)
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if (I->hasSection() &&
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(I->getSection() == ".ctors" ||
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I->getSection() == ".dtors")) {
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std::string SectionName = ".section\t" + I->getSection()
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+ ",\"aw\",@progbits";
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SwitchToDataSection(SectionName.c_str());
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} else {
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if (C->isNullValue())
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SwitchToDataSection("\t.section\t.bss", I);
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else
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SwitchToDataSection("\t.section\t.data", I);
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}
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//4: Type, Size, Align
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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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EmitAlignment(Align, I);
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O << name << ":\n";
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// If the initializer is a extern weak symbol, remember to emit the weak
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// reference!
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if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
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if (GV->hasExternalWeakLinkage())
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ExtWeakSymbols.insert(GV);
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EmitGlobalConstant(C);
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O << '\n';
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}
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return AsmPrinter::doFinalization(M);
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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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