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https://github.com/c64scene-ar/llvm-6502.git
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1924aabf99
target-specific AsmPrinters. Not all comments need DebugInfo. Re-enable the line numbers comment test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88697 91177308-0d34-0410-b5e6-96231b3b80d8
412 lines
12 KiB
C++
412 lines
12 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 "MSP430InstPrinter.h"
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#include "MSP430MCAsmInfo.h"
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#include "MSP430MCInstLower.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/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/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/MC/MCInst.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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STATISTIC(EmittedInsts, "Number of machine instrs printed");
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static cl::opt<bool>
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EnableMCInst("enable-msp430-mcinst-printer", cl::Hidden,
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cl::desc("enable experimental mcinst gunk in the msp430 backend"));
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namespace {
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class MSP430AsmPrinter : public AsmPrinter {
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public:
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MSP430AsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
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const MCAsmInfo *MAI, bool V)
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: AsmPrinter(O, TM, MAI, 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 printMCInst(const MCInst *MI) {
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MSP430InstPrinter(O, *MAI).printInstruction(MI);
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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 printPCRelImmOperand(const MachineInstr *MI, int OpNum) {
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printOperand(MI, OpNum);
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}
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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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void printMachineInstruction(const MachineInstr * MI);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode);
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bool PrintAsmMemoryOperand(const MachineInstr *MI,
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unsigned OpNo, unsigned AsmVariant,
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const char *ExtraCode);
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void printInstructionThroughMCStreamer(const MachineInstr *MI);
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void PrintGlobalVariable(const GlobalVariable* GVar);
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void emitFunctionHeader(const MachineFunction &MF);
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bool runOnMachineFunction(MachineFunction &F);
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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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void MSP430AsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
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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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const TargetData *TD = TM.getTargetData();
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std::string name = Mang->getMangledName(GVar);
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Constant *C = GVar->getInitializer();
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unsigned Size = TD->getTypeAllocSize(C->getType());
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unsigned Align = TD->getPreferredAlignmentLog(GVar);
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printVisibility(name, GVar->getVisibility());
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O << "\t.type\t" << name << ",@object\n";
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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
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TM));
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if (C->isNullValue() && !GVar->hasSection() &&
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!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\t" << name << '\n';
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O << MAI->getCOMMDirective() << name << ',' << Size;
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if (MAI->getCOMMDirectiveTakesAlignment())
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O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
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if (VerboseAsm) {
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O.PadToColumn(MAI->getCommentColumn());
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O << MAI->getCommentString() << ' ';
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WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
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}
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O << '\n';
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return;
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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:
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case GlobalValue::WeakODRLinkage:
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O << "\t.weak\t" << name << '\n';
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break;
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case GlobalValue::DLLExportLinkage:
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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::PrivateLinkage:
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case GlobalValue::LinkerPrivateLinkage:
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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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}
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// Use 16-bit alignment by default to simplify bunch of stuff
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EmitAlignment(Align, GVar);
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O << name << ":";
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if (VerboseAsm) {
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O.PadToColumn(MAI->getCommentColumn());
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O << MAI->getCommentString() << ' ';
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WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
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}
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O << '\n';
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EmitGlobalConstant(C);
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if (MAI->hasDotTypeDotSizeDirective())
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O << "\t.size\t" << name << ", " << Size << '\n';
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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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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
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unsigned FnAlign = MF.getAlignment();
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EmitAlignment(FnAlign, 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\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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EmitBasicBlockStart(I);
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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 (MAI->hasDotTypeDotSizeDirective())
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O << "\t.size\t" << CurrentFnName << ", .-" << 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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void MSP430AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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++EmittedInsts;
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processDebugLoc(MI, true);
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printInstructionThroughMCStreamer(MI);
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if (VerboseAsm)
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EmitComments(*MI);
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O << '\n';
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processDebugLoc(MI, false);
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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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O << MSP430InstPrinter::getRegisterName(MO.getReg());
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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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GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
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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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std::string Name = Mang->getMangledName(MO.getGlobal());
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uint64_t Offset = MO.getOffset();
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O << (isMemOp ? '&' : '#');
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if (Offset)
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O << '(' << Offset << '+';
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O << Name;
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if (Offset)
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O << ')';
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return;
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}
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case MachineOperand::MO_ExternalSymbol: {
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bool isMemOp = Modifier && !strcmp(Modifier, "mem");
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std::string Name(MAI->getGlobalPrefix());
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Name += MO.getSymbolName();
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O << (isMemOp ? '&' : '#') << Name;
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return;
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}
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default:
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llvm_unreachable("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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// Print displacement first
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if (!Disp.isImm()) {
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printOperand(MI, OpNum+1, "mem");
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} else {
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if (!Base.getReg())
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O << '&';
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printOperand(MI, OpNum+1, "nohash");
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}
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// Print register base field
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if (Base.getReg()) {
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O << '(';
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printOperand(MI, OpNum);
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O << ')';
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}
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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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llvm_unreachable("Unsupported CC code");
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break;
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case MSP430CC::COND_E:
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O << "eq";
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break;
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case MSP430CC::COND_NE:
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O << "ne";
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break;
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case MSP430CC::COND_HS:
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O << "hs";
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break;
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case MSP430CC::COND_LO:
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O << "lo";
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break;
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case MSP430CC::COND_GE:
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O << "ge";
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break;
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case MSP430CC::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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/// PrintAsmOperand - Print out an operand for an inline asm expression.
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///
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bool MSP430AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode) {
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// Does this asm operand have a single letter operand modifier?
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if (ExtraCode && ExtraCode[0])
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return true; // Unknown modifier.
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printOperand(MI, OpNo);
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return false;
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}
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bool MSP430AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
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unsigned OpNo, 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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}
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printSrcMemOperand(MI, OpNo);
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return false;
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}
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//===----------------------------------------------------------------------===//
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void MSP430AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI){
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MSP430MCInstLower MCInstLowering(OutContext, *Mang, *this);
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switch (MI->getOpcode()) {
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case TargetInstrInfo::DBG_LABEL:
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case TargetInstrInfo::EH_LABEL:
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case TargetInstrInfo::GC_LABEL:
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printLabel(MI);
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return;
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case TargetInstrInfo::KILL:
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printKill(MI);
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return;
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case TargetInstrInfo::INLINEASM:
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printInlineAsm(MI);
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return;
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case TargetInstrInfo::IMPLICIT_DEF:
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printImplicitDef(MI);
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return;
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default: break;
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}
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MCInst TmpInst;
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MCInstLowering.Lower(MI, TmpInst);
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printMCInst(&TmpInst);
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}
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static MCInstPrinter *createMSP430MCInstPrinter(const Target &T,
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unsigned SyntaxVariant,
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const MCAsmInfo &MAI,
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raw_ostream &O) {
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if (SyntaxVariant == 0)
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return new MSP430InstPrinter(O, MAI);
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return 0;
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}
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// Force static initialization.
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extern "C" void LLVMInitializeMSP430AsmPrinter() {
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RegisterAsmPrinter<MSP430AsmPrinter> X(TheMSP430Target);
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TargetRegistry::RegisterMCInstPrinter(TheMSP430Target,
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createMSP430MCInstPrinter);
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}
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