| //===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains a printer that converts from our internal representation |
| // of machine-dependent LLVM code to the XAS-format XCore assembly language. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "asm-printer" |
| #include "XCore.h" |
| #include "XCoreInstrInfo.h" |
| #include "XCoreSubtarget.h" |
| #include "XCoreTargetMachine.h" |
| #include "llvm/Constants.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/CodeGen/DwarfWriter.h" |
| #include "llvm/CodeGen/MachineModuleInfo.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineConstantPool.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/Target/TargetAsmInfo.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Support/Mangler.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <algorithm> |
| #include <cctype> |
| using namespace llvm; |
| |
| STATISTIC(EmittedInsts, "Number of machine instrs printed"); |
| |
| static cl::opt<std::string> FileDirective("xcore-file-directive", cl::Optional, |
| cl::desc("Output a file directive into the assembly file"), |
| cl::Hidden, |
| cl::value_desc("filename"), |
| cl::init("")); |
| |
| static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional, |
| cl::desc("Maximum number of threads (for emulation thread-local storage)"), |
| cl::Hidden, |
| cl::value_desc("number"), |
| cl::init(8)); |
| |
| namespace { |
| class VISIBILITY_HIDDEN XCoreAsmPrinter : public AsmPrinter { |
| DwarfWriter *DW; |
| const XCoreSubtarget &Subtarget; |
| public: |
| explicit XCoreAsmPrinter(raw_ostream &O, XCoreTargetMachine &TM, |
| const TargetAsmInfo *T, CodeGenOpt::Level OL, |
| bool V) |
| : AsmPrinter(O, TM, T, OL, V), DW(0), |
| Subtarget(*TM.getSubtargetImpl()) {} |
| |
| virtual const char *getPassName() const { |
| return "XCore Assembly Printer"; |
| } |
| |
| void printMemOperand(const MachineInstr *MI, int opNum); |
| void printOperand(const MachineInstr *MI, int opNum); |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode); |
| |
| void emitFileDirective(const std::string &filename); |
| void emitGlobalDirective(const std::string &name); |
| void emitExternDirective(const std::string &name); |
| |
| void emitArrayBound(const std::string &name, const GlobalVariable *GV); |
| void emitGlobal(const GlobalVariable *GV); |
| |
| void emitFunctionStart(MachineFunction &MF); |
| void emitFunctionEnd(MachineFunction &MF); |
| |
| bool printInstruction(const MachineInstr *MI); // autogenerated. |
| void printMachineInstruction(const MachineInstr *MI); |
| bool runOnMachineFunction(MachineFunction &F); |
| bool doInitialization(Module &M); |
| bool doFinalization(Module &M); |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const { |
| AsmPrinter::getAnalysisUsage(AU); |
| AU.setPreservesAll(); |
| AU.addRequired<MachineModuleInfo>(); |
| AU.addRequired<DwarfWriter>(); |
| } |
| }; |
| } // end of anonymous namespace |
| |
| #include "XCoreGenAsmWriter.inc" |
| |
| /// createXCoreCodePrinterPass - Returns a pass that prints the XCore |
| /// assembly code for a MachineFunction to the given output stream, |
| /// using the given target machine description. This should work |
| /// regardless of whether the function is in SSA form. |
| /// |
| FunctionPass *llvm::createXCoreCodePrinterPass(raw_ostream &o, |
| XCoreTargetMachine &tm, |
| CodeGenOpt::Level OptLevel, |
| bool verbose) { |
| return new XCoreAsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose); |
| } |
| |
| // PrintEscapedString - Print each character of the specified string, escaping |
| // it if it is not printable or if it is an escape char. |
| static void PrintEscapedString(const std::string &Str, raw_ostream &Out) { |
| for (unsigned i = 0, e = Str.size(); i != e; ++i) { |
| unsigned char C = Str[i]; |
| if (isprint(C) && C != '"' && C != '\\') { |
| Out << C; |
| } else { |
| Out << '\\' |
| << (char) ((C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A')) |
| << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A')); |
| } |
| } |
| } |
| |
| void XCoreAsmPrinter:: |
| emitFileDirective(const std::string &name) |
| { |
| O << "\t.file\t\""; |
| PrintEscapedString(name, O); |
| O << "\"\n"; |
| } |
| |
| void XCoreAsmPrinter:: |
| emitGlobalDirective(const std::string &name) |
| { |
| O << TAI->getGlobalDirective() << name; |
| O << "\n"; |
| } |
| |
| void XCoreAsmPrinter:: |
| emitExternDirective(const std::string &name) |
| { |
| O << "\t.extern\t" << name; |
| O << '\n'; |
| } |
| |
| void XCoreAsmPrinter:: |
| emitArrayBound(const std::string &name, const GlobalVariable *GV) |
| { |
| assert(((GV->hasExternalLinkage() || |
| GV->hasWeakLinkage()) || |
| GV->hasLinkOnceLinkage()) && "Unexpected linkage"); |
| if (const ArrayType *ATy = dyn_cast<ArrayType>( |
| cast<PointerType>(GV->getType())->getElementType())) |
| { |
| O << TAI->getGlobalDirective() << name << ".globound" << "\n"; |
| O << TAI->getSetDirective() << name << ".globound" << "," |
| << ATy->getNumElements() << "\n"; |
| if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) { |
| // TODO Use COMDAT groups for LinkOnceLinkage |
| O << TAI->getWeakDefDirective() << name << ".globound" << "\n"; |
| } |
| } |
| } |
| |
| void XCoreAsmPrinter:: |
| emitGlobal(const GlobalVariable *GV) |
| { |
| const TargetData *TD = TM.getTargetData(); |
| |
| if (GV->hasInitializer()) { |
| // Check to see if this is a special global used by LLVM, if so, emit it. |
| if (EmitSpecialLLVMGlobal(GV)) |
| return; |
| |
| SwitchToSection(TAI->SectionForGlobal(GV)); |
| |
| std::string name = Mang->getValueName(GV); |
| Constant *C = GV->getInitializer(); |
| unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType()); |
| |
| // Mark the start of the global |
| O << "\t.cc_top " << name << ".data," << name << "\n"; |
| |
| switch (GV->getLinkage()) { |
| case GlobalValue::AppendingLinkage: |
| cerr << "AppendingLinkage is not supported by this target!\n"; |
| abort(); |
| case GlobalValue::LinkOnceAnyLinkage: |
| case GlobalValue::LinkOnceODRLinkage: |
| case GlobalValue::WeakAnyLinkage: |
| case GlobalValue::WeakODRLinkage: |
| case GlobalValue::ExternalLinkage: |
| emitArrayBound(name, GV); |
| emitGlobalDirective(name); |
| // TODO Use COMDAT groups for LinkOnceLinkage |
| if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) { |
| O << TAI->getWeakDefDirective() << name << "\n"; |
| } |
| // FALL THROUGH |
| case GlobalValue::InternalLinkage: |
| case GlobalValue::PrivateLinkage: |
| break; |
| case GlobalValue::GhostLinkage: |
| cerr << "Should not have any unmaterialized functions!\n"; |
| abort(); |
| case GlobalValue::DLLImportLinkage: |
| cerr << "DLLImport linkage is not supported by this target!\n"; |
| abort(); |
| case GlobalValue::DLLExportLinkage: |
| cerr << "DLLExport linkage is not supported by this target!\n"; |
| abort(); |
| default: |
| assert(0 && "Unknown linkage type!"); |
| } |
| |
| EmitAlignment(Align, GV, 2); |
| |
| unsigned Size = TD->getTypeAllocSize(C->getType()); |
| if (GV->isThreadLocal()) { |
| Size *= MaxThreads; |
| } |
| if (TAI->hasDotTypeDotSizeDirective()) { |
| O << "\t.type " << name << ",@object\n"; |
| O << "\t.size " << name << "," << Size << "\n"; |
| } |
| O << name << ":\n"; |
| |
| EmitGlobalConstant(C); |
| if (GV->isThreadLocal()) { |
| for (unsigned i = 1; i < MaxThreads; ++i) { |
| EmitGlobalConstant(C); |
| } |
| } |
| if (Size < 4) { |
| // The ABI requires that unsigned scalar types smaller than 32 bits |
| // are are padded to 32 bits. |
| EmitZeros(4 - Size); |
| } |
| |
| // Mark the end of the global |
| O << "\t.cc_bottom " << name << ".data\n"; |
| } else { |
| if (GV->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(GV); |
| } |
| } |
| |
| /// Emit the directives on the start of functions |
| void XCoreAsmPrinter:: |
| emitFunctionStart(MachineFunction &MF) |
| { |
| // Print out the label for the function. |
| const Function *F = MF.getFunction(); |
| |
| SwitchToSection(TAI->SectionForGlobal(F)); |
| |
| // Mark the start of the function |
| O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n"; |
| |
| switch (F->getLinkage()) { |
| default: assert(0 && "Unknown linkage type!"); |
| case Function::InternalLinkage: // Symbols default to internal. |
| case Function::PrivateLinkage: |
| break; |
| case Function::ExternalLinkage: |
| emitGlobalDirective(CurrentFnName); |
| break; |
| case Function::LinkOnceAnyLinkage: |
| case Function::LinkOnceODRLinkage: |
| case Function::WeakAnyLinkage: |
| case Function::WeakODRLinkage: |
| // TODO Use COMDAT groups for LinkOnceLinkage |
| O << TAI->getGlobalDirective() << CurrentFnName << "\n"; |
| O << TAI->getWeakDefDirective() << CurrentFnName << "\n"; |
| break; |
| } |
| // (1 << 1) byte aligned |
| EmitAlignment(1, F, 1); |
| if (TAI->hasDotTypeDotSizeDirective()) { |
| O << "\t.type " << CurrentFnName << ",@function\n"; |
| } |
| O << CurrentFnName << ":\n"; |
| } |
| |
| /// Emit the directives on the end of functions |
| void XCoreAsmPrinter:: |
| emitFunctionEnd(MachineFunction &MF) |
| { |
| // Mark the end of the function |
| O << "\t.cc_bottom " << CurrentFnName << ".function\n"; |
| } |
| |
| /// runOnMachineFunction - This uses the printMachineInstruction() |
| /// method to print assembly for each instruction. |
| /// |
| bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF) |
| { |
| this->MF = &MF; |
| |
| SetupMachineFunction(MF); |
| |
| // Print out constants referenced by the function |
| EmitConstantPool(MF.getConstantPool()); |
| |
| // Print out jump tables referenced by the function |
| EmitJumpTableInfo(MF.getJumpTableInfo(), MF); |
| |
| // Emit the function start directives |
| emitFunctionStart(MF); |
| |
| // Emit pre-function debug information. |
| DW->BeginFunction(&MF); |
| |
| // Print out code for the function. |
| for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); |
| I != E; ++I) { |
| |
| // Print a label for the basic block. |
| if (I != MF.begin()) { |
| printBasicBlockLabel(I, true , true); |
| O << '\n'; |
| } |
| |
| for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); |
| II != E; ++II) { |
| // Print the assembly for the instruction. |
| O << "\t"; |
| printMachineInstruction(II); |
| } |
| |
| // Each Basic Block is separated by a newline |
| O << '\n'; |
| } |
| |
| // Emit function end directives |
| emitFunctionEnd(MF); |
| |
| // Emit post-function debug information. |
| DW->EndFunction(&MF); |
| |
| // We didn't modify anything. |
| return false; |
| } |
| |
| void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum) |
| { |
| printOperand(MI, opNum); |
| |
| if (MI->getOperand(opNum+1).isImm() |
| && MI->getOperand(opNum+1).getImm() == 0) |
| return; |
| |
| O << "+"; |
| printOperand(MI, opNum+1); |
| } |
| |
| void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) { |
| const MachineOperand &MO = MI->getOperand(opNum); |
| switch (MO.getType()) { |
| case MachineOperand::MO_Register: |
| if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) |
| O << TM.getRegisterInfo()->get(MO.getReg()).AsmName; |
| else |
| assert(0 && "not implemented"); |
| break; |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| break; |
| case MachineOperand::MO_MachineBasicBlock: |
| printBasicBlockLabel(MO.getMBB()); |
| break; |
| case MachineOperand::MO_GlobalAddress: |
| { |
| const GlobalValue *GV = MO.getGlobal(); |
| O << Mang->getValueName(GV); |
| if (GV->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(GV); |
| } |
| break; |
| case MachineOperand::MO_ExternalSymbol: |
| O << MO.getSymbolName(); |
| break; |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() |
| << '_' << MO.getIndex(); |
| break; |
| case MachineOperand::MO_JumpTableIndex: |
| O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() |
| << '_' << MO.getIndex(); |
| break; |
| default: |
| assert(0 && "not implemented"); |
| } |
| } |
| |
| /// PrintAsmOperand - Print out an operand for an inline asm expression. |
| /// |
| bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode) { |
| printOperand(MI, OpNo); |
| return false; |
| } |
| |
| void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) { |
| ++EmittedInsts; |
| |
| // Check for mov mnemonic |
| unsigned src, dst, srcSR, dstSR; |
| if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst, srcSR, dstSR)) { |
| O << "\tmov "; |
| O << TM.getRegisterInfo()->get(dst).AsmName; |
| O << ", "; |
| O << TM.getRegisterInfo()->get(src).AsmName; |
| O << "\n"; |
| return; |
| } |
| if (printInstruction(MI)) { |
| return; |
| } |
| assert(0 && "Unhandled instruction in asm writer!"); |
| } |
| |
| bool XCoreAsmPrinter::doInitialization(Module &M) { |
| bool Result = AsmPrinter::doInitialization(M); |
| |
| if (!FileDirective.empty()) { |
| emitFileDirective(FileDirective); |
| } |
| |
| // Print out type strings for external functions here |
| for (Module::const_iterator I = M.begin(), E = M.end(); |
| I != E; ++I) { |
| if (I->isDeclaration() && !I->isIntrinsic()) { |
| switch (I->getLinkage()) { |
| default: |
| assert(0 && "Unexpected linkage"); |
| case Function::ExternalWeakLinkage: |
| ExtWeakSymbols.insert(I); |
| // fallthrough |
| case Function::ExternalLinkage: |
| break; |
| } |
| } |
| } |
| |
| // Emit initial debug information. |
| DW = getAnalysisIfAvailable<DwarfWriter>(); |
| assert(DW && "Dwarf Writer is not available"); |
| DW->BeginModule(&M, getAnalysisIfAvailable<MachineModuleInfo>(), |
| O, this, TAI); |
| return Result; |
| } |
| |
| bool XCoreAsmPrinter::doFinalization(Module &M) { |
| |
| // Print out module-level global variables. |
| for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); |
| I != E; ++I) { |
| emitGlobal(I); |
| } |
| |
| // Emit final debug information. |
| DW->EndModule(); |
| |
| return AsmPrinter::doFinalization(M); |
| } |