forked from OSchip/llvm-project
281 lines
9.8 KiB
C++
281 lines
9.8 KiB
C++
//===-- XCoreAsmPrinter.cpp - XCore 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 XAS-format XCore assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "XCore.h"
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#include "XCoreInstrInfo.h"
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#include "XCoreSubtarget.h"
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#include "XCoreMCAsmInfo.h"
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#include "XCoreTargetMachine.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineConstantPool.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/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetRegistry.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/Support/CommandLine.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 <algorithm>
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#include <cctype>
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using namespace llvm;
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static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional,
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cl::desc("Maximum number of threads (for emulation thread-local storage)"),
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cl::Hidden,
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cl::value_desc("number"),
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cl::init(8));
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namespace {
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class XCoreAsmPrinter : public AsmPrinter {
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const XCoreSubtarget &Subtarget;
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public:
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explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
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: AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()){}
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virtual const char *getPassName() const {
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return "XCore Assembly Printer";
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}
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void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
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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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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &O);
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void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
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virtual void EmitGlobalVariable(const GlobalVariable *GV);
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void printInstruction(const MachineInstr *MI, raw_ostream &O); // autogen'd.
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static const char *getRegisterName(unsigned RegNo);
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void EmitFunctionEntryLabel();
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void EmitInstruction(const MachineInstr *MI);
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void EmitFunctionBodyEnd();
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};
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} // end of anonymous namespace
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#include "XCoreGenAsmWriter.inc"
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void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
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assert(((GV->hasExternalLinkage() ||
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GV->hasWeakLinkage()) ||
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GV->hasLinkOnceLinkage()) && "Unexpected linkage");
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if (const ArrayType *ATy = dyn_cast<ArrayType>(
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cast<PointerType>(GV->getType())->getElementType())) {
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OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
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// FIXME: MCStreamerize.
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OutStreamer.EmitRawText(StringRef(".globound"));
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OutStreamer.EmitRawText("\t.set\t" + Twine(Sym->getName()));
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OutStreamer.EmitRawText(".globound," + Twine(ATy->getNumElements()));
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
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// TODO Use COMDAT groups for LinkOnceLinkage
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OutStreamer.EmitRawText(MAI->getWeakDefDirective() +Twine(Sym->getName())+
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".globound");
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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() ||
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EmitSpecialLLVMGlobal(GV))
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return;
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const TargetData *TD = TM.getTargetData();
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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
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MCSymbol *GVSym = Mang->getSymbol(GV);
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const Constant *C = GV->getInitializer();
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unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
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// Mark the start of the global
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OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," +
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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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emitArrayBound(GVSym, GV);
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
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// TODO Use COMDAT groups for LinkOnceLinkage
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
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// FALL THROUGH
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case GlobalValue::InternalLinkage:
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case GlobalValue::PrivateLinkage:
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break;
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case GlobalValue::DLLImportLinkage:
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llvm_unreachable("DLLImport linkage is not supported by this target!");
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case GlobalValue::DLLExportLinkage:
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llvm_unreachable("DLLExport linkage is not supported by this target!");
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default:
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llvm_unreachable("Unknown linkage type!");
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}
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EmitAlignment(Align > 2 ? Align : 2, GV);
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unsigned Size = TD->getTypeAllocSize(C->getType());
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if (GV->isThreadLocal()) {
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Size *= MaxThreads;
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}
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if (MAI->hasDotTypeDotSizeDirective()) {
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
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OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
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Twine(Size));
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}
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OutStreamer.EmitLabel(GVSym);
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EmitGlobalConstant(C);
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if (GV->isThreadLocal()) {
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for (unsigned i = 1; i < MaxThreads; ++i)
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EmitGlobalConstant(C);
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}
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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, 0);
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// Mark the end of the global
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OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
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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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OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) +
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".function");
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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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OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) +
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".function," + CurrentFnSym->getName());
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OutStreamer.EmitLabel(CurrentFnSym);
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}
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void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
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raw_ostream &O) {
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printOperand(MI, opNum, O);
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if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
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return;
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O << "+";
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printOperand(MI, opNum+1, O);
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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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O << *MBB->getSymbol();
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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 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 << 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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O << *MO.getMBB()->getSymbol();
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break;
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case MachineOperand::MO_GlobalAddress:
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O << *Mang->getSymbol(MO.getGlobal());
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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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case MachineOperand::MO_ConstantPoolIndex:
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O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
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<< '_' << MO.getIndex();
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break;
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case MachineOperand::MO_JumpTableIndex:
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O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
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<< '_' << MO.getIndex();
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break;
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case MachineOperand::MO_BlockAddress:
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O << *GetBlockAddressSymbol(MO.getBlockAddress());
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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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unsigned AsmVariant,const char *ExtraCode,
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raw_ostream &O) {
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printOperand(MI, OpNo, 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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// Check for mov mnemonic
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if (MI->getOpcode() == XCore::ADD_2rus && !MI->getOperand(2).getImm())
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O << "\tmov " << getRegisterName(MI->getOperand(0).getReg()) << ", "
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<< getRegisterName(MI->getOperand(1).getReg());
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else
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printInstruction(MI, O);
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OutStreamer.EmitRawText(O.str());
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}
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// Force static initialization.
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extern "C" void LLVMInitializeXCoreAsmPrinter() {
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RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);
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}
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