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a1d10f171e
This patch includes all missing functionality needed to provide first compilation of a simple program that just returns from a function. I've added a test case that checks for "ret" instruction printed in assembly output. Patch by Andrei Grischenko (andrei.l.grischenko@intel.com) Differential revision: https://reviews.llvm.org/D39688 llvm-svn: 320035
154 lines
4.7 KiB
C++
154 lines
4.7 KiB
C++
//===-- Nios2AsmPrinter.cpp - Nios2 LLVM Assembly Printer -----------------===//
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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 NIOS2 assembly language.
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//
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//===----------------------------------------------------------------------===//
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#include "InstPrinter/Nios2InstPrinter.h"
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#include "MCTargetDesc/Nios2BaseInfo.h"
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#include "Nios2.h"
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#include "Nios2TargetMachine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define DEBUG_TYPE "nios2-asm-printer"
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namespace {
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class Nios2AsmPrinter : public AsmPrinter {
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public:
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explicit Nios2AsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)) {}
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StringRef getPassName() const override { return "Nios2 Assembly Printer"; }
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//- EmitInstruction() must exists or will have run time error.
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void EmitInstruction(const MachineInstr *MI) override;
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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) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &O) override;
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void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
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void EmitFunctionEntryLabel() override;
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};
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} // namespace
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//- EmitInstruction() must exists or will have run time error.
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void Nios2AsmPrinter::EmitInstruction(const MachineInstr *MI) {
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// Print out both ordinary instruction and boudle instruction
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MachineBasicBlock::const_instr_iterator I = MI->getIterator();
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MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
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do {
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if (I->isPseudo()) {
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llvm_unreachable("Pseudo opcode found in EmitInstruction()");
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}
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MCInst TmpInst0;
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LowerNios2MachineInstToMCInst(&*I, TmpInst0, *this);
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EmitToStreamer(*OutStreamer, TmpInst0);
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} while ((++I != E) && I->isInsideBundle()); // Delay slot check
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}
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// .type main,@function
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//-> .ent main # @main
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// main:
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void Nios2AsmPrinter::EmitFunctionEntryLabel() {
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OutStreamer->EmitLabel(CurrentFnSym);
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}
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// Print out an operand for an inline asm expression.
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bool Nios2AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
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unsigned AsmVariant,
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const char *ExtraCode, raw_ostream &O) {
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printOperand(MI, OpNum, O);
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return false;
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}
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bool Nios2AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
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unsigned OpNum, 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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const MachineOperand &MO = MI->getOperand(OpNum);
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assert(MO.isReg() && "unexpected inline asm memory operand");
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O << "($" << Nios2InstPrinter::getRegisterName(MO.getReg()) << ")";
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return false;
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}
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void Nios2AsmPrinter::printOperand(const MachineInstr *MI, int opNum,
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raw_ostream &O) {
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const MachineOperand &MO = MI->getOperand(opNum);
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bool closeP = false;
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if (MO.getTargetFlags())
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closeP = true;
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switch (MO.getTargetFlags()) {
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case Nios2FG::MO_ABS_HI:
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O << "%hiadj(";
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break;
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case Nios2FG::MO_ABS_LO:
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O << "%lo(";
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break;
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}
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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O << '$'
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<< StringRef(Nios2InstPrinter::getRegisterName(MO.getReg())).lower();
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break;
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case MachineOperand::MO_Immediate:
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O << MO.getImm();
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break;
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case MachineOperand::MO_MachineBasicBlock:
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MO.getMBB()->getSymbol()->print(O, MAI);
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return;
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case MachineOperand::MO_GlobalAddress:
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getSymbol(MO.getGlobal())->print(O, MAI);
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break;
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case MachineOperand::MO_BlockAddress:
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O << GetBlockAddressSymbol(MO.getBlockAddress())->getName();
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break;
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case MachineOperand::MO_ExternalSymbol:
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O << MO.getSymbolName();
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break;
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default:
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llvm_unreachable("<unknown operand type>");
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}
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if (closeP)
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O << ")";
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}
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// Force static initialization.
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extern "C" void LLVMInitializeNios2AsmPrinter() {
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RegisterAsmPrinter<Nios2AsmPrinter> X(getTheNios2Target());
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}
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