89b57061f7
This moves the registry higher in the LLVM library dependency stack. Every client of the target registry needs to link against MC anyway to actually use the target, so we might as well move this out of Support. This allows us to ensure that Support doesn't have includes from MC/*. Differential Revision: https://reviews.llvm.org/D111454
297 lines
10 KiB
C++
297 lines
10 KiB
C++
//===-- 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/MC/TargetRegistry.h"
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#include "llvm/Support/ErrorHandling.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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