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//===-- MSP430AsmPrinter.cpp - MSP430 LLVM assembly writer ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to the MSP430 assembly language.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/MSP430InstPrinter.h"
#include "MSP430MCInstLower.h"
#include "MSP430TargetMachine.h"
#include "TargetInfo/MSP430TargetInfo.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/IR/Mangler.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
namespace {
class MSP430AsmPrinter : public AsmPrinter {
public:
MSP430AsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)) {}
StringRef getPassName() const override { return "MSP430 Assembly Printer"; }
bool runOnMachineFunction(MachineFunction &MF) override;
void PrintSymbolOperand(const MachineOperand &MO, raw_ostream &O) override;
void printOperand(const MachineInstr *MI, int OpNum,
raw_ostream &O, const char* Modifier = nullptr);
void printSrcMemOperand(const MachineInstr *MI, int OpNum,
raw_ostream &O);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &O) override;
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &O) override;
void emitInstruction(const MachineInstr *MI) override;
void EmitInterruptVectorSection(MachineFunction &ISR);
};
} // end of anonymous namespace
void MSP430AsmPrinter::PrintSymbolOperand(const MachineOperand &MO,
raw_ostream &O) {
uint64_t Offset = MO.getOffset();
if (Offset)
O << '(' << Offset << '+';
getSymbol(MO.getGlobal())->print(O, MAI);
if (Offset)
O << ')';
}
void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
raw_ostream &O, const char *Modifier) {
const MachineOperand &MO = MI->getOperand(OpNum);
switch (MO.getType()) {
default: llvm_unreachable("Not implemented yet!");
case MachineOperand::MO_Register:
O << MSP430InstPrinter::getRegisterName(MO.getReg());
return;
case MachineOperand::MO_Immediate:
if (!Modifier || strcmp(Modifier, "nohash"))
O << '#';
O << MO.getImm();
return;
case MachineOperand::MO_MachineBasicBlock:
MO.getMBB()->getSymbol()->print(O, MAI);
return;
case MachineOperand::MO_GlobalAddress: {
// If the global address expression is a part of displacement field with a
// register base, we should not emit any prefix symbol here, e.g.
// mov.w glb(r1), r2
// Otherwise (!) msp430-as will silently miscompile the output :(
if (!Modifier || strcmp(Modifier, "nohash"))
O << '#';
PrintSymbolOperand(MO, O);
return;
}
}
}
void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
raw_ostream &O) {
const MachineOperand &Base = MI->getOperand(OpNum);
const MachineOperand &Disp = MI->getOperand(OpNum+1);
// Print displacement first
// Imm here is in fact global address - print extra modifier.
if (Disp.isImm() && Base.getReg() == MSP430::SR)
O << '&';
printOperand(MI, OpNum+1, O, "nohash");
// Print register base field
if (Base.getReg() != MSP430::SR && Base.getReg() != MSP430::PC) {
O << '(';
printOperand(MI, OpNum, O);
O << ')';
}
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool MSP430AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &O) {
// Does this asm operand have a single letter operand modifier?
if (ExtraCode && ExtraCode[0])
return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, O);
printOperand(MI, OpNo, O);
return false;
}
bool MSP430AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0]) {
return true; // Unknown modifier.
}
printSrcMemOperand(MI, OpNo, O);
return false;
}
//===----------------------------------------------------------------------===//
void MSP430AsmPrinter::emitInstruction(const MachineInstr *MI) {
MSP430_MC::verifyInstructionPredicates(MI->getOpcode(),
getSubtargetInfo().getFeatureBits());
MSP430MCInstLower MCInstLowering(OutContext, *this);
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
EmitToStreamer(*OutStreamer, TmpInst);
}
void MSP430AsmPrinter::EmitInterruptVectorSection(MachineFunction &ISR) {
MCSection *Cur = OutStreamer->getCurrentSectionOnly();
const auto *F = &ISR.getFunction();
if (F->getCallingConv() != CallingConv::MSP430_INTR) {
report_fatal_error("Functions with 'interrupt' attribute must have msp430_intrcc CC");
}
StringRef IVIdx = F->getFnAttribute("interrupt").getValueAsString();
MCSection *IV = OutStreamer->getContext().getELFSection(
"__interrupt_vector_" + IVIdx,
ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_EXECINSTR);
OutStreamer->switchSection(IV);
const MCSymbol *FunctionSymbol = getSymbol(F);
OutStreamer->emitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
OutStreamer->switchSection(Cur);
}
bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
// Emit separate section for an interrupt vector if ISR
if (MF.getFunction().hasFnAttribute("interrupt")) {
EmitInterruptVectorSection(MF);
}
SetupMachineFunction(MF);
emitFunctionBody();
return false;
}
// Force static initialization.
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430AsmPrinter() {
RegisterAsmPrinter<MSP430AsmPrinter> X(getTheMSP430Target());
}
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