forked from OSchip/llvm-project
162 lines
5.3 KiB
C++
162 lines
5.3 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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#include "MSP430.h"
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#include "InstPrinter/MSP430InstPrinter.h"
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#include "MSP430InstrInfo.h"
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#include "MSP430MCInstLower.h"
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#include "MSP430TargetMachine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCAsmInfo.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/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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namespace {
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class MSP430AsmPrinter : public AsmPrinter {
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public:
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MSP430AsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
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: AsmPrinter(TM, Streamer) {}
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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 printOperand(const MachineInstr *MI, int OpNum,
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raw_ostream &O, const char* Modifier = nullptr);
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void printSrcMemOperand(const MachineInstr *MI, int OpNum,
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raw_ostream &O);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &O);
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bool PrintAsmMemoryOperand(const MachineInstr *MI,
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unsigned OpNo, unsigned AsmVariant,
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const char *ExtraCode, raw_ostream &O);
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void EmitInstruction(const MachineInstr *MI);
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};
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} // end of anonymous namespace
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void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
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raw_ostream &O, const char *Modifier) {
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const MachineOperand &MO = MI->getOperand(OpNum);
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switch (MO.getType()) {
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default: llvm_unreachable("Not implemented yet!");
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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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O << *MO.getMBB()->getSymbol();
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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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uint64_t Offset = MO.getOffset();
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// If the global address expression is a part of displacement field with a
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// register base, we should not emit any prefix symbol here, e.g.
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// mov.w &foo, r1
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// vs
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// mov.w glb(r1), r2
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// Otherwise (!) msp430-as will silently miscompile the output :(
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if (!Modifier || strcmp(Modifier, "nohash"))
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O << (isMemOp ? '&' : '#');
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if (Offset)
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O << '(' << Offset << '+';
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O << *getSymbol(MO.getGlobal());
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if (Offset)
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O << ')';
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return;
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}
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}
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}
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void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
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raw_ostream &O) {
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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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// Imm here is in fact global address - print extra modifier.
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if (Disp.isImm() && !Base.getReg())
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O << '&';
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printOperand(MI, OpNum+1, O, "nohash");
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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, O);
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O << ')';
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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, raw_ostream &O) {
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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, O);
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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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raw_ostream &O) {
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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, O);
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return false;
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}
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//===----------------------------------------------------------------------===//
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void MSP430AsmPrinter::EmitInstruction(const MachineInstr *MI) {
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MSP430MCInstLower MCInstLowering(OutContext, *this);
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MCInst TmpInst;
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MCInstLowering.Lower(MI, TmpInst);
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EmitToStreamer(OutStreamer, TmpInst);
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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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}
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