297 lines
10 KiB
C++
297 lines
10 KiB
C++
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//===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 XAS-format XCore assembly language.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/XCoreInstPrinter.h"
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#include "TargetInfo/XCoreTargetInfo.h"
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#include "XCore.h"
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#include "XCoreInstrInfo.h"
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#include "XCoreMCInstLower.h"
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#include "XCoreSubtarget.h"
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#include "XCoreTargetMachine.h"
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#include "XCoreTargetStreamer.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.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/MachineJumpTableInfo.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/DataLayout.h"
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#include "llvm/IR/DebugInfo.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/MCExpr.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/MCSymbolELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include <algorithm>
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#include <cctype>
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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 XCoreAsmPrinter : public AsmPrinter {
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XCoreMCInstLower MCInstLowering;
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XCoreTargetStreamer &getTargetStreamer();
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public:
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explicit XCoreAsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)), MCInstLowering(*this) {}
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StringRef getPassName() const override { return "XCore Assembly Printer"; }
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void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
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const std::string &directive = ".jmptable");
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void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
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printInlineJT(MI, opNum, O, ".jmptable32");
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}
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void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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const char *ExtraCode, raw_ostream &O) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
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const char *ExtraCode, raw_ostream &O) override;
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void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
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void emitGlobalVariable(const GlobalVariable *GV) override;
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void emitFunctionEntryLabel() override;
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void emitInstruction(const MachineInstr *MI) override;
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void emitFunctionBodyStart() override;
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void emitFunctionBodyEnd() override;
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};
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} // end of anonymous namespace
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XCoreTargetStreamer &XCoreAsmPrinter::getTargetStreamer() {
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return static_cast<XCoreTargetStreamer&>(*OutStreamer->getTargetStreamer());
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}
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void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
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assert( ( GV->hasExternalLinkage() || GV->hasWeakLinkage() ||
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GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() ) &&
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"Unexpected linkage");
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if (ArrayType *ATy = dyn_cast<ArrayType>(GV->getValueType())) {
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MCSymbol *SymGlob = OutContext.getOrCreateSymbol(
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Twine(Sym->getName() + StringRef(".globound")));
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OutStreamer->emitSymbolAttribute(SymGlob, MCSA_Global);
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OutStreamer->emitAssignment(SymGlob,
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MCConstantExpr::create(ATy->getNumElements(),
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OutContext));
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
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GV->hasCommonLinkage()) {
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OutStreamer->emitSymbolAttribute(SymGlob, MCSA_Weak);
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}
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}
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}
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void XCoreAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
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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 (!GV->hasInitializer() || emitSpecialLLVMGlobal(GV))
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return;
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const DataLayout &DL = getDataLayout();
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OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(GV, TM));
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MCSymbol *GVSym = getSymbol(GV);
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const Constant *C = GV->getInitializer();
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const Align Alignment(DL.getPrefTypeAlignment(C->getType()));
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// Mark the start of the global
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getTargetStreamer().emitCCTopData(GVSym->getName());
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switch (GV->getLinkage()) {
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case GlobalValue::AppendingLinkage:
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report_fatal_error("AppendingLinkage is not supported by this target!");
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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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case GlobalValue::ExternalLinkage:
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case GlobalValue::CommonLinkage:
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emitArrayBound(GVSym, GV);
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OutStreamer->emitSymbolAttribute(GVSym, MCSA_Global);
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
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GV->hasCommonLinkage())
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OutStreamer->emitSymbolAttribute(GVSym, MCSA_Weak);
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LLVM_FALLTHROUGH;
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case GlobalValue::InternalLinkage:
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case GlobalValue::PrivateLinkage:
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break;
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default:
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llvm_unreachable("Unknown linkage type!");
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}
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emitAlignment(std::max(Alignment, Align(4)), GV);
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if (GV->isThreadLocal()) {
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report_fatal_error("TLS is not supported by this target!");
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}
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unsigned Size = DL.getTypeAllocSize(C->getType());
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if (MAI->hasDotTypeDotSizeDirective()) {
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OutStreamer->emitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
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OutStreamer->emitELFSize(GVSym, MCConstantExpr::create(Size, OutContext));
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}
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OutStreamer->emitLabel(GVSym);
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emitGlobalConstant(DL, C);
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// The ABI requires that unsigned scalar types smaller than 32 bits
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// are padded to 32 bits.
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if (Size < 4)
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OutStreamer->emitZeros(4 - Size);
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// Mark the end of the global
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getTargetStreamer().emitCCBottomData(GVSym->getName());
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}
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void XCoreAsmPrinter::emitFunctionBodyStart() {
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MCInstLowering.Initialize(&MF->getContext());
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}
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/// EmitFunctionBodyEnd - Targets can override this to emit stuff after
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/// the last basic block in the function.
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void XCoreAsmPrinter::emitFunctionBodyEnd() {
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// Emit function end directives
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getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName());
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}
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void XCoreAsmPrinter::emitFunctionEntryLabel() {
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// Mark the start of the function
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getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName());
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OutStreamer->emitLabel(CurrentFnSym);
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}
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void XCoreAsmPrinter::
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printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
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const std::string &directive) {
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unsigned JTI = MI->getOperand(opNum).getIndex();
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const MachineFunction *MF = MI->getParent()->getParent();
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const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
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const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
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const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
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O << "\t" << directive << " ";
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for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
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MachineBasicBlock *MBB = JTBBs[i];
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if (i > 0)
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O << ",";
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MBB->getSymbol()->print(O, MAI);
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}
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}
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void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
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raw_ostream &O) {
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const DataLayout &DL = getDataLayout();
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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 << XCoreInstPrinter::getRegisterName(MO.getReg());
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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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break;
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case MachineOperand::MO_GlobalAddress:
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PrintSymbolOperand(MO, O);
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
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<< MO.getIndex();
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break;
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case MachineOperand::MO_BlockAddress:
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GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
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break;
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default:
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llvm_unreachable("not implemented");
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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 XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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const char *ExtraCode, raw_ostream &O) {
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// Print the operand if there is no operand modifier.
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if (!ExtraCode || !ExtraCode[0]) {
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printOperand(MI, OpNo, O);
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return false;
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}
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// Otherwise fallback on the default implementation.
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return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, O);
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}
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bool XCoreAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
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unsigned OpNum,
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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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printOperand(MI, OpNum, O);
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O << '[';
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printOperand(MI, OpNum + 1, O);
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O << ']';
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return false;
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}
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void XCoreAsmPrinter::emitInstruction(const MachineInstr *MI) {
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SmallString<128> Str;
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raw_svector_ostream O(Str);
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switch (MI->getOpcode()) {
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case XCore::DBG_VALUE:
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llvm_unreachable("Should be handled target independently");
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case XCore::ADD_2rus:
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if (MI->getOperand(2).getImm() == 0) {
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O << "\tmov "
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<< XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
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<< XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
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OutStreamer->emitRawText(O.str());
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return;
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}
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break;
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case XCore::BR_JT:
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case XCore::BR_JT32:
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O << "\tbru "
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<< XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
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if (MI->getOpcode() == XCore::BR_JT)
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printInlineJT(MI, 0, O);
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else
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printInlineJT32(MI, 0, O);
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O << '\n';
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OutStreamer->emitRawText(O.str());
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return;
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}
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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" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreAsmPrinter() {
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RegisterAsmPrinter<XCoreAsmPrinter> X(getTheXCoreTarget());
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}
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