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Diffstat (limited to 'lib/CodeGen/AsmPrinter/AsmPrinter.cpp')
| -rw-r--r-- | lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 1724 |
1 files changed, 1724 insertions, 0 deletions
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp new file mode 100644 index 0000000..45462da --- /dev/null +++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp @@ -0,0 +1,1724 @@ +//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the AsmPrinter class. +// +//===----------------------------------------------------------------------===// + +#include "llvm/CodeGen/AsmPrinter.h" +#include "llvm/Assembly/Writer.h" +#include "llvm/DerivedTypes.h" +#include "llvm/Constants.h" +#include "llvm/Module.h" +#include "llvm/CodeGen/GCMetadataPrinter.h" +#include "llvm/CodeGen/MachineConstantPool.h" +#include "llvm/CodeGen/MachineJumpTableInfo.h" +#include "llvm/CodeGen/MachineModuleInfo.h" +#include "llvm/CodeGen/DwarfWriter.h" +#include "llvm/Analysis/DebugInfo.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/Mangler.h" +#include "llvm/Support/raw_ostream.h" +#include "llvm/Target/TargetAsmInfo.h" +#include "llvm/Target/TargetData.h" +#include "llvm/Target/TargetLowering.h" +#include "llvm/Target/TargetOptions.h" +#include "llvm/Target/TargetRegisterInfo.h" +#include "llvm/ADT/SmallPtrSet.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/StringExtras.h" +#include <cerrno> +using namespace llvm; + +static cl::opt<cl::boolOrDefault> +AsmVerbose("asm-verbose", cl::desc("Add comments to directives."), + cl::init(cl::BOU_UNSET)); + +char AsmPrinter::ID = 0; +AsmPrinter::AsmPrinter(raw_ostream &o, TargetMachine &tm, + const TargetAsmInfo *T, CodeGenOpt::Level OL, bool VDef) + : MachineFunctionPass(&ID), FunctionNumber(0), OptLevel(OL), O(o), + TM(tm), TAI(T), TRI(tm.getRegisterInfo()), + IsInTextSection(false) +{ + switch (AsmVerbose) { + case cl::BOU_UNSET: VerboseAsm = VDef; break; + case cl::BOU_TRUE: VerboseAsm = true; break; + case cl::BOU_FALSE: VerboseAsm = false; break; + } +} + +AsmPrinter::~AsmPrinter() { + for (gcp_iterator I = GCMetadataPrinters.begin(), + E = GCMetadataPrinters.end(); I != E; ++I) + delete I->second; +} + +/// SwitchToTextSection - Switch to the specified text section of the executable +/// if we are not already in it! +/// +void AsmPrinter::SwitchToTextSection(const char *NewSection, + const GlobalValue *GV) { + std::string NS; + if (GV && GV->hasSection()) + NS = TAI->getSwitchToSectionDirective() + GV->getSection(); + else + NS = NewSection; + + // If we're already in this section, we're done. + if (CurrentSection == NS) return; + + // Close the current section, if applicable. + if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) + O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; + + CurrentSection = NS; + + if (!CurrentSection.empty()) + O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n'; + + IsInTextSection = true; +} + +/// SwitchToDataSection - Switch to the specified data section of the executable +/// if we are not already in it! +/// +void AsmPrinter::SwitchToDataSection(const char *NewSection, + const GlobalValue *GV) { + std::string NS; + if (GV && GV->hasSection()) + NS = TAI->getSwitchToSectionDirective() + GV->getSection(); + else + NS = NewSection; + + // If we're already in this section, we're done. + if (CurrentSection == NS) return; + + // Close the current section, if applicable. + if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) + O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; + + CurrentSection = NS; + + if (!CurrentSection.empty()) + O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n'; + + IsInTextSection = false; +} + +/// SwitchToSection - Switch to the specified section of the executable if we +/// are not already in it! +void AsmPrinter::SwitchToSection(const Section* NS) { + const std::string& NewSection = NS->getName(); + + // If we're already in this section, we're done. + if (CurrentSection == NewSection) return; + + // Close the current section, if applicable. + if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) + O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; + + // FIXME: Make CurrentSection a Section* in the future + CurrentSection = NewSection; + CurrentSection_ = NS; + + if (!CurrentSection.empty()) { + // If section is named we need to switch into it via special '.section' + // directive and also append funky flags. Otherwise - section name is just + // some magic assembler directive. + if (NS->isNamed()) + O << TAI->getSwitchToSectionDirective() + << CurrentSection + << TAI->getSectionFlags(NS->getFlags()); + else + O << CurrentSection; + O << TAI->getDataSectionStartSuffix() << '\n'; + } + + IsInTextSection = (NS->getFlags() & SectionFlags::Code); +} + +void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { + MachineFunctionPass::getAnalysisUsage(AU); + AU.addRequired<GCModuleInfo>(); +} + +bool AsmPrinter::doInitialization(Module &M) { + Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix()); + + GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); + assert(MI && "AsmPrinter didn't require GCModuleInfo?"); + + if (TAI->hasSingleParameterDotFile()) { + /* Very minimal debug info. It is ignored if we emit actual + debug info. If we don't, this at helps the user find where + a function came from. */ + O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; + } + + for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) + if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) + MP->beginAssembly(O, *this, *TAI); + + if (!M.getModuleInlineAsm().empty()) + O << TAI->getCommentString() << " Start of file scope inline assembly\n" + << M.getModuleInlineAsm() + << '\n' << TAI->getCommentString() + << " End of file scope inline assembly\n"; + + SwitchToDataSection(""); // Reset back to no section. + + MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>(); + if (MMI) MMI->AnalyzeModule(M); + DW = getAnalysisIfAvailable<DwarfWriter>(); + return false; +} + +bool AsmPrinter::doFinalization(Module &M) { + if (TAI->getWeakRefDirective()) { + if (!ExtWeakSymbols.empty()) + SwitchToDataSection(""); + + for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(), + e = ExtWeakSymbols.end(); i != e; ++i) + O << TAI->getWeakRefDirective() << Mang->getValueName(*i) << '\n'; + } + + if (TAI->getSetDirective()) { + if (!M.alias_empty()) + SwitchToSection(TAI->getTextSection()); + + O << '\n'; + for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); + I!=E; ++I) { + std::string Name = Mang->getValueName(I); + std::string Target; + + const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); + Target = Mang->getValueName(GV); + + if (I->hasExternalLinkage() || !TAI->getWeakRefDirective()) + O << "\t.globl\t" << Name << '\n'; + else if (I->hasWeakLinkage()) + O << TAI->getWeakRefDirective() << Name << '\n'; + else if (!I->hasLocalLinkage()) + assert(0 && "Invalid alias linkage"); + + printVisibility(Name, I->getVisibility()); + + O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n'; + } + } + + GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); + assert(MI && "AsmPrinter didn't require GCModuleInfo?"); + for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) + if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) + MP->finishAssembly(O, *this, *TAI); + + // If we don't have any trampolines, then we don't require stack memory + // to be executable. Some targets have a directive to declare this. + Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); + if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) + if (TAI->getNonexecutableStackDirective()) + O << TAI->getNonexecutableStackDirective() << '\n'; + + delete Mang; Mang = 0; + return false; +} + +const std::string & +AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF, + std::string &Name) const { + assert(MF && "No machine function?"); + Name = MF->getFunction()->getName(); + if (Name.empty()) + Name = Mang->getValueName(MF->getFunction()); + Name = Mang->makeNameProper(TAI->getEHGlobalPrefix() + + Name + ".eh", TAI->getGlobalPrefix()); + return Name; +} + +void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { + // What's my mangled name? + CurrentFnName = Mang->getValueName(MF.getFunction()); + IncrementFunctionNumber(); +} + +namespace { + // SectionCPs - Keep track the alignment, constpool entries per Section. + struct SectionCPs { + const Section *S; + unsigned Alignment; + SmallVector<unsigned, 4> CPEs; + SectionCPs(const Section *s, unsigned a) : S(s), Alignment(a) {}; + }; +} + +/// EmitConstantPool - Print to the current output stream assembly +/// representations of the constants in the constant pool MCP. This is +/// used to print out constants which have been "spilled to memory" by +/// the code generator. +/// +void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { + const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); + if (CP.empty()) return; + + // Calculate sections for constant pool entries. We collect entries to go into + // the same section together to reduce amount of section switch statements. + SmallVector<SectionCPs, 4> CPSections; + for (unsigned i = 0, e = CP.size(); i != e; ++i) { + MachineConstantPoolEntry CPE = CP[i]; + unsigned Align = CPE.getAlignment(); + const Section* S = TAI->SelectSectionForMachineConst(CPE.getType()); + // The number of sections are small, just do a linear search from the + // last section to the first. + bool Found = false; + unsigned SecIdx = CPSections.size(); + while (SecIdx != 0) { + if (CPSections[--SecIdx].S == S) { + Found = true; + break; + } + } + if (!Found) { + SecIdx = CPSections.size(); + CPSections.push_back(SectionCPs(S, Align)); + } + + if (Align > CPSections[SecIdx].Alignment) + CPSections[SecIdx].Alignment = Align; + CPSections[SecIdx].CPEs.push_back(i); + } + + // Now print stuff into the calculated sections. + for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { + SwitchToSection(CPSections[i].S); + EmitAlignment(Log2_32(CPSections[i].Alignment)); + + unsigned Offset = 0; + for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { + unsigned CPI = CPSections[i].CPEs[j]; + MachineConstantPoolEntry CPE = CP[CPI]; + + // Emit inter-object padding for alignment. + unsigned AlignMask = CPE.getAlignment() - 1; + unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; + EmitZeros(NewOffset - Offset); + + const Type *Ty = CPE.getType(); + Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); + + O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' + << CPI << ":\t\t\t\t\t"; + if (VerboseAsm) { + O << TAI->getCommentString() << ' '; + WriteTypeSymbolic(O, CPE.getType(), 0); + } + O << '\n'; + if (CPE.isMachineConstantPoolEntry()) + EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); + else + EmitGlobalConstant(CPE.Val.ConstVal); + } + } +} + +/// EmitJumpTableInfo - Print assembly representations of the jump tables used +/// by the current function to the current output stream. +/// +void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, + MachineFunction &MF) { + const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); + if (JT.empty()) return; + + bool IsPic = TM.getRelocationModel() == Reloc::PIC_; + + // Pick the directive to use to print the jump table entries, and switch to + // the appropriate section. + TargetLowering *LoweringInfo = TM.getTargetLowering(); + + const char* JumpTableDataSection = TAI->getJumpTableDataSection(); + const Function *F = MF.getFunction(); + unsigned SectionFlags = TAI->SectionFlagsForGlobal(F); + if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) || + !JumpTableDataSection || + SectionFlags & SectionFlags::Linkonce) { + // In PIC mode, we need to emit the jump table to the same section as the + // function body itself, otherwise the label differences won't make sense. + // We should also do if the section name is NULL or function is declared in + // discardable section. + SwitchToSection(TAI->SectionForGlobal(F)); + } else { + SwitchToDataSection(JumpTableDataSection); + } + + EmitAlignment(Log2_32(MJTI->getAlignment())); + + for (unsigned i = 0, e = JT.size(); i != e; ++i) { + const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; + + // If this jump table was deleted, ignore it. + if (JTBBs.empty()) continue; + + // For PIC codegen, if possible we want to use the SetDirective to reduce + // the number of relocations the assembler will generate for the jump table. + // Set directives are all printed before the jump table itself. + SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; + if (TAI->getSetDirective() && IsPic) + for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) + if (EmittedSets.insert(JTBBs[ii])) + printPICJumpTableSetLabel(i, JTBBs[ii]); + + // On some targets (e.g. darwin) we want to emit two consequtive labels + // before each jump table. The first label is never referenced, but tells + // the assembler and linker the extents of the jump table object. The + // second label is actually referenced by the code. + if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix()) + O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n"; + + O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() + << '_' << i << ":\n"; + + for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { + printPICJumpTableEntry(MJTI, JTBBs[ii], i); + O << '\n'; + } + } +} + +void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, + const MachineBasicBlock *MBB, + unsigned uid) const { + bool IsPic = TM.getRelocationModel() == Reloc::PIC_; + + // Use JumpTableDirective otherwise honor the entry size from the jump table + // info. + const char *JTEntryDirective = TAI->getJumpTableDirective(); + bool HadJTEntryDirective = JTEntryDirective != NULL; + if (!HadJTEntryDirective) { + JTEntryDirective = MJTI->getEntrySize() == 4 ? + TAI->getData32bitsDirective() : TAI->getData64bitsDirective(); + } + + O << JTEntryDirective << ' '; + + // If we have emitted set directives for the jump table entries, print + // them rather than the entries themselves. If we're emitting PIC, then + // emit the table entries as differences between two text section labels. + // If we're emitting non-PIC code, then emit the entries as direct + // references to the target basic blocks. + if (IsPic) { + if (TAI->getSetDirective()) { + O << TAI->getPrivateGlobalPrefix() << getFunctionNumber() + << '_' << uid << "_set_" << MBB->getNumber(); + } else { + printBasicBlockLabel(MBB, false, false, false); + // If the arch uses custom Jump Table directives, don't calc relative to + // JT + if (!HadJTEntryDirective) + O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" + << getFunctionNumber() << '_' << uid; + } + } else { + printBasicBlockLabel(MBB, false, false, false); + } +} + + +/// EmitSpecialLLVMGlobal - Check to see if the specified global is a +/// special global used by LLVM. If so, emit it and return true, otherwise +/// do nothing and return false. +bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { + if (GV->getName() == "llvm.used") { + if (TAI->getUsedDirective() != 0) // No need to emit this at all. + EmitLLVMUsedList(GV->getInitializer()); + return true; + } + + // Ignore debug and non-emitted data. + if (GV->getSection() == "llvm.metadata" || + GV->hasAvailableExternallyLinkage()) + return true; + + if (!GV->hasAppendingLinkage()) return false; + + assert(GV->hasInitializer() && "Not a special LLVM global!"); + + const TargetData *TD = TM.getTargetData(); + unsigned Align = Log2_32(TD->getPointerPrefAlignment()); + if (GV->getName() == "llvm.global_ctors") { + SwitchToDataSection(TAI->getStaticCtorsSection()); + EmitAlignment(Align, 0); + EmitXXStructorList(GV->getInitializer()); + return true; + } + + if (GV->getName() == "llvm.global_dtors") { + SwitchToDataSection(TAI->getStaticDtorsSection()); + EmitAlignment(Align, 0); + EmitXXStructorList(GV->getInitializer()); + return true; + } + + return false; +} + +/// findGlobalValue - if CV is an expression equivalent to a single +/// global value, return that value. +const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) { + if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) + return GV; + else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { + const TargetData *TD = TM.getTargetData(); + unsigned Opcode = CE->getOpcode(); + switch (Opcode) { + case Instruction::GetElementPtr: { + const Constant *ptrVal = CE->getOperand(0); + SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); + if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size())) + return 0; + return findGlobalValue(ptrVal); + } + case Instruction::BitCast: + return findGlobalValue(CE->getOperand(0)); + default: + return 0; + } + } + return 0; +} + +/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each +/// global in the specified llvm.used list for which emitUsedDirectiveFor +/// is true, as being used with this directive. + +void AsmPrinter::EmitLLVMUsedList(Constant *List) { + const char *Directive = TAI->getUsedDirective(); + + // Should be an array of 'sbyte*'. + ConstantArray *InitList = dyn_cast<ConstantArray>(List); + if (InitList == 0) return; + + for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { + const GlobalValue *GV = findGlobalValue(InitList->getOperand(i)); + if (TAI->emitUsedDirectiveFor(GV, Mang)) { + O << Directive; + EmitConstantValueOnly(InitList->getOperand(i)); + O << '\n'; + } + } +} + +/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the +/// function pointers, ignoring the init priority. +void AsmPrinter::EmitXXStructorList(Constant *List) { + // Should be an array of '{ int, void ()* }' structs. The first value is the + // init priority, which we ignore. + if (!isa<ConstantArray>(List)) return; + ConstantArray *InitList = cast<ConstantArray>(List); + for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) + if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ + if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. + + if (CS->getOperand(1)->isNullValue()) + return; // Found a null terminator, exit printing. + // Emit the function pointer. + EmitGlobalConstant(CS->getOperand(1)); + } +} + +/// getGlobalLinkName - Returns the asm/link name of of the specified +/// global variable. Should be overridden by each target asm printer to +/// generate the appropriate value. +const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV, + std::string &LinkName) const { + if (isa<Function>(GV)) { + LinkName += TAI->getFunctionAddrPrefix(); + LinkName += Mang->getValueName(GV); + LinkName += TAI->getFunctionAddrSuffix(); + } else { + LinkName += TAI->getGlobalVarAddrPrefix(); + LinkName += Mang->getValueName(GV); + LinkName += TAI->getGlobalVarAddrSuffix(); + } + + return LinkName; +} + +/// EmitExternalGlobal - Emit the external reference to a global variable. +/// Should be overridden if an indirect reference should be used. +void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) { + std::string GLN; + O << getGlobalLinkName(GV, GLN); +} + + + +//===----------------------------------------------------------------------===// +/// LEB 128 number encoding. + +/// PrintULEB128 - Print a series of hexidecimal values (separated by commas) +/// representing an unsigned leb128 value. +void AsmPrinter::PrintULEB128(unsigned Value) const { + char Buffer[20]; + do { + unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); + Value >>= 7; + if (Value) Byte |= 0x80; + O << "0x" << utohex_buffer(Byte, Buffer+20); + if (Value) O << ", "; + } while (Value); +} + +/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas) +/// representing a signed leb128 value. +void AsmPrinter::PrintSLEB128(int Value) const { + int Sign = Value >> (8 * sizeof(Value) - 1); + bool IsMore; + char Buffer[20]; + + do { + unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); + Value >>= 7; + IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; + if (IsMore) Byte |= 0x80; + O << "0x" << utohex_buffer(Byte, Buffer+20); + if (IsMore) O << ", "; + } while (IsMore); +} + +//===--------------------------------------------------------------------===// +// Emission and print routines +// + +/// PrintHex - Print a value as a hexidecimal value. +/// +void AsmPrinter::PrintHex(int Value) const { + char Buffer[20]; + O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20); +} + +/// EOL - Print a newline character to asm stream. If a comment is present +/// then it will be printed first. Comments should not contain '\n'. +void AsmPrinter::EOL() const { + O << '\n'; +} + +void AsmPrinter::EOL(const std::string &Comment) const { + if (VerboseAsm && !Comment.empty()) { + O << '\t' + << TAI->getCommentString() + << ' ' + << Comment; + } + O << '\n'; +} + +void AsmPrinter::EOL(const char* Comment) const { + if (VerboseAsm && *Comment) { + O << '\t' + << TAI->getCommentString() + << ' ' + << Comment; + } + O << '\n'; +} + +/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an +/// unsigned leb128 value. +void AsmPrinter::EmitULEB128Bytes(unsigned Value) const { + if (TAI->hasLEB128()) { + O << "\t.uleb128\t" + << Value; + } else { + O << TAI->getData8bitsDirective(); + PrintULEB128(Value); + } +} + +/// EmitSLEB128Bytes - print an assembler byte data directive to compose a +/// signed leb128 value. +void AsmPrinter::EmitSLEB128Bytes(int Value) const { + if (TAI->hasLEB128()) { + O << "\t.sleb128\t" + << Value; + } else { + O << TAI->getData8bitsDirective(); + PrintSLEB128(Value); + } +} + +/// EmitInt8 - Emit a byte directive and value. +/// +void AsmPrinter::EmitInt8(int Value) const { + O << TAI->getData8bitsDirective(); + PrintHex(Value & 0xFF); +} + +/// EmitInt16 - Emit a short directive and value. +/// +void AsmPrinter::EmitInt16(int Value) const { + O << TAI->getData16bitsDirective(); + PrintHex(Value & 0xFFFF); +} + +/// EmitInt32 - Emit a long directive and value. +/// +void AsmPrinter::EmitInt32(int Value) const { + O << TAI->getData32bitsDirective(); + PrintHex(Value); +} + +/// EmitInt64 - Emit a long long directive and value. +/// +void AsmPrinter::EmitInt64(uint64_t Value) const { + if (TAI->getData64bitsDirective()) { + O << TAI->getData64bitsDirective(); + PrintHex(Value); + } else { + if (TM.getTargetData()->isBigEndian()) { + EmitInt32(unsigned(Value >> 32)); O << '\n'; + EmitInt32(unsigned(Value)); + } else { + EmitInt32(unsigned(Value)); O << '\n'; + EmitInt32(unsigned(Value >> 32)); + } + } +} + +/// toOctal - Convert the low order bits of X into an octal digit. +/// +static inline char toOctal(int X) { + return (X&7)+'0'; +} + +/// printStringChar - Print a char, escaped if necessary. +/// +static void printStringChar(raw_ostream &O, unsigned char C) { + if (C == '"') { + O << "\\\""; + } else if (C == '\\') { + O << "\\\\"; + } else if (isprint((unsigned char)C)) { + O << C; + } else { + switch(C) { + case '\b': O << "\\b"; break; + case '\f': O << "\\f"; break; + case '\n': O << "\\n"; break; + case '\r': O << "\\r"; break; + case '\t': O << "\\t"; break; + default: + O << '\\'; + O << toOctal(C >> 6); + O << toOctal(C >> 3); + O << toOctal(C >> 0); + break; + } + } +} + +/// EmitString - Emit a string with quotes and a null terminator. +/// Special characters are emitted properly. +/// \literal (Eg. '\t') \endliteral +void AsmPrinter::EmitString(const std::string &String) const { + EmitString(String.c_str(), String.size()); +} + +void AsmPrinter::EmitString(const char *String, unsigned Size) const { + const char* AscizDirective = TAI->getAscizDirective(); + if (AscizDirective) + O << AscizDirective; + else + O << TAI->getAsciiDirective(); + O << '\"'; + for (unsigned i = 0; i < Size; ++i) + printStringChar(O, String[i]); + if (AscizDirective) + O << '\"'; + else + O << "\\0\""; +} + + +/// EmitFile - Emit a .file directive. +void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const { + O << "\t.file\t" << Number << " \""; + for (unsigned i = 0, N = Name.size(); i < N; ++i) + printStringChar(O, Name[i]); + O << '\"'; +} + + +//===----------------------------------------------------------------------===// + +// EmitAlignment - Emit an alignment directive to the specified power of +// two boundary. For example, if you pass in 3 here, you will get an 8 +// byte alignment. If a global value is specified, and if that global has +// an explicit alignment requested, it will unconditionally override the +// alignment request. However, if ForcedAlignBits is specified, this value +// has final say: the ultimate alignment will be the max of ForcedAlignBits +// and the alignment computed with NumBits and the global. +// +// The algorithm is: +// Align = NumBits; +// if (GV && GV->hasalignment) Align = GV->getalignment(); +// Align = std::max(Align, ForcedAlignBits); +// +void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, + unsigned ForcedAlignBits, + bool UseFillExpr) const { + if (GV && GV->getAlignment()) + NumBits = Log2_32(GV->getAlignment()); + NumBits = std::max(NumBits, ForcedAlignBits); + + if (NumBits == 0) return; // No need to emit alignment. + if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits; + O << TAI->getAlignDirective() << NumBits; + + unsigned FillValue = TAI->getTextAlignFillValue(); + UseFillExpr &= IsInTextSection && FillValue; + if (UseFillExpr) { + O << ','; + PrintHex(FillValue); + } + O << '\n'; +} + + +/// EmitZeros - Emit a block of zeros. +/// +void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const { + if (NumZeros) { + if (TAI->getZeroDirective()) { + O << TAI->getZeroDirective() << NumZeros; + if (TAI->getZeroDirectiveSuffix()) + O << TAI->getZeroDirectiveSuffix(); + O << '\n'; + } else { + for (; NumZeros; --NumZeros) + O << TAI->getData8bitsDirective(AddrSpace) << "0\n"; + } + } +} + +// Print out the specified constant, without a storage class. Only the +// constants valid in constant expressions can occur here. +void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { + if (CV->isNullValue() || isa<UndefValue>(CV)) + O << '0'; + else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { + O << CI->getZExtValue(); + } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { + // This is a constant address for a global variable or function. Use the + // name of the variable or function as the address value, possibly + // decorating it with GlobalVarAddrPrefix/Suffix or + // FunctionAddrPrefix/Suffix (these all default to "" ) + if (isa<Function>(GV)) { + O << TAI->getFunctionAddrPrefix() + << Mang->getValueName(GV) + << TAI->getFunctionAddrSuffix(); + } else { + O << TAI->getGlobalVarAddrPrefix() + << Mang->getValueName(GV) + << TAI->getGlobalVarAddrSuffix(); + } + } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { + const TargetData *TD = TM.getTargetData(); + unsigned Opcode = CE->getOpcode(); + switch (Opcode) { + case Instruction::GetElementPtr: { + // generate a symbolic expression for the byte address + const Constant *ptrVal = CE->getOperand(0); + SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); + if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], + idxVec.size())) { + // Truncate/sext the offset to the pointer size. + if (TD->getPointerSizeInBits() != 64) { + int SExtAmount = 64-TD->getPointerSizeInBits(); + Offset = (Offset << SExtAmount) >> SExtAmount; + } + + if (Offset) + O << '('; + EmitConstantValueOnly(ptrVal); + if (Offset > 0) + O << ") + " << Offset; + else if (Offset < 0) + O << ") - " << -Offset; + } else { + EmitConstantValueOnly(ptrVal); + } + break; + } + case Instruction::Trunc: + case Instruction::ZExt: + case Instruction::SExt: + case Instruction::FPTrunc: + case Instruction::FPExt: + case Instruction::UIToFP: + case Instruction::SIToFP: + case Instruction::FPToUI: + case Instruction::FPToSI: + assert(0 && "FIXME: Don't yet support this kind of constant cast expr"); + break; + case Instruction::BitCast: + return EmitConstantValueOnly(CE->getOperand(0)); + + case Instruction::IntToPtr: { + // Handle casts to pointers by changing them into casts to the appropriate + // integer type. This promotes constant folding and simplifies this code. + Constant *Op = CE->getOperand(0); + Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/); + return EmitConstantValueOnly(Op); + } + + + case Instruction::PtrToInt: { + // Support only foldable casts to/from pointers that can be eliminated by + // changing the pointer to the appropriately sized integer type. + Constant *Op = CE->getOperand(0); + const Type *Ty = CE->getType(); + + // We can emit the pointer value into this slot if the slot is an + // integer slot greater or equal to the size of the pointer. + if (TD->getTypeAllocSize(Ty) >= TD->getTypeAllocSize(Op->getType())) + return EmitConstantValueOnly(Op); + + O << "(("; + EmitConstantValueOnly(Op); + APInt ptrMask = APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Ty)); + + SmallString<40> S; + ptrMask.toStringUnsigned(S); + O << ") & " << S.c_str() << ')'; + break; + } + case Instruction::Add: + case Instruction::Sub: + case Instruction::And: + case Instruction::Or: + case Instruction::Xor: + O << '('; + EmitConstantValueOnly(CE->getOperand(0)); + O << ')'; + switch (Opcode) { + case Instruction::Add: + O << " + "; + break; + case Instruction::Sub: + O << " - "; + break; + case Instruction::And: + O << " & "; + break; + case Instruction::Or: + O << " | "; + break; + case Instruction::Xor: + O << " ^ "; + break; + default: + break; + } + O << '('; + EmitConstantValueOnly(CE->getOperand(1)); + O << ')'; + break; + default: + assert(0 && "Unsupported operator!"); + } + } else { + assert(0 && "Unknown constant value!"); + } +} + +/// printAsCString - Print the specified array as a C compatible string, only if +/// the predicate isString is true. +/// +static void printAsCString(raw_ostream &O, const ConstantArray *CVA, + unsigned LastElt) { + assert(CVA->isString() && "Array is not string compatible!"); + + O << '\"'; + for (unsigned i = 0; i != LastElt; ++i) { + unsigned char C = + (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue(); + printStringChar(O, C); + } + O << '\"'; +} + +/// EmitString - Emit a zero-byte-terminated string constant. +/// +void AsmPrinter::EmitString(const ConstantArray *CVA) const { + unsigned NumElts = CVA->getNumOperands(); + if (TAI->getAscizDirective() && NumElts && + cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) { + O << TAI->getAscizDirective(); + printAsCString(O, CVA, NumElts-1); + } else { + O << TAI->getAsciiDirective(); + printAsCString(O, CVA, NumElts); + } + O << '\n'; +} + +void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA, + unsigned AddrSpace) { + if (CVA->isString()) { + EmitString(CVA); + } else { // Not a string. Print the values in successive locations + for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) + EmitGlobalConstant(CVA->getOperand(i), AddrSpace); + } +} + +void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) { + const VectorType *PTy = CP->getType(); + + for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I) + EmitGlobalConstant(CP->getOperand(I)); +} + +void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS, + unsigned AddrSpace) { + // Print the fields in successive locations. Pad to align if needed! + const TargetData *TD = TM.getTargetData(); + unsigned Size = TD->getTypeAllocSize(CVS->getType()); + const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType()); + uint64_t sizeSoFar = 0; + for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) { + const Constant* field = CVS->getOperand(i); + + // Check if padding is needed and insert one or more 0s. + uint64_t fieldSize = TD->getTypeAllocSize(field->getType()); + uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1)) + - cvsLayout->getElementOffset(i)) - fieldSize; + sizeSoFar += fieldSize + padSize; + + // Now print the actual field value. + EmitGlobalConstant(field, AddrSpace); + + // Insert padding - this may include padding to increase the size of the + // current field up to the ABI size (if the struct is not packed) as well + // as padding to ensure that the next field starts at the right offset. + EmitZeros(padSize, AddrSpace); + } + assert(sizeSoFar == cvsLayout->getSizeInBytes() && + "Layout of constant struct may be incorrect!"); +} + +void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP, + unsigned AddrSpace) { + // FP Constants are printed as integer constants to avoid losing + // precision... + const TargetData *TD = TM.getTargetData(); + if (CFP->getType() == Type::DoubleTy) { + double Val = CFP->getValueAPF().convertToDouble(); // for comment only + uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); + if (TAI->getData64bitsDirective(AddrSpace)) { + O << TAI->getData64bitsDirective(AddrSpace) << i; + if (VerboseAsm) + O << '\t' << TAI->getCommentString() << " double value: " << Val; + O << '\n'; + } else if (TD->isBigEndian()) { + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " double most significant word " << Val; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " double least significant word " << Val; + O << '\n'; + } else { + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " double least significant word " << Val; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " double most significant word " << Val; + O << '\n'; + } + return; + } else if (CFP->getType() == Type::FloatTy) { + float Val = CFP->getValueAPF().convertToFloat(); // for comment only + O << TAI->getData32bitsDirective(AddrSpace) + << CFP->getValueAPF().bitcastToAPInt().getZExtValue(); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() << " float " << Val; + O << '\n'; + return; + } else if (CFP->getType() == Type::X86_FP80Ty) { + // all long double variants are printed as hex + // api needed to prevent premature destruction + APInt api = CFP->getValueAPF().bitcastToAPInt(); + const uint64_t *p = api.getRawData(); + // Convert to double so we can print the approximate val as a comment. + APFloat DoubleVal = CFP->getValueAPF(); + bool ignored; + DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, + &ignored); + if (TD->isBigEndian()) { + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double most significant halfword of ~" + << DoubleVal.convertToDouble(); + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() << " long double next halfword"; + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() << " long double next halfword"; + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() << " long double next halfword"; + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double least significant halfword"; + O << '\n'; + } else { + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double least significant halfword of ~" + << DoubleVal.convertToDouble(); + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double next halfword"; + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double next halfword"; + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double next halfword"; + O << '\n'; + O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double most significant halfword"; + O << '\n'; + } + EmitZeros(TD->getTypeAllocSize(Type::X86_FP80Ty) - + TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace); + return; + } else if (CFP->getType() == Type::PPC_FP128Ty) { + // all long double variants are printed as hex + // api needed to prevent premature destruction + APInt api = CFP->getValueAPF().bitcastToAPInt(); + const uint64_t *p = api.getRawData(); + if (TD->isBigEndian()) { + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double most significant word"; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double next word"; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double next word"; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double least significant word"; + O << '\n'; + } else { + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double least significant word"; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double next word"; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double next word"; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " long double most significant word"; + O << '\n'; + } + return; + } else assert(0 && "Floating point constant type not handled"); +} + +void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI, + unsigned AddrSpace) { + const TargetData *TD = TM.getTargetData(); + unsigned BitWidth = CI->getBitWidth(); + assert(isPowerOf2_32(BitWidth) && + "Non-power-of-2-sized integers not handled!"); + + // We don't expect assemblers to support integer data directives + // for more than 64 bits, so we emit the data in at most 64-bit + // quantities at a time. + const uint64_t *RawData = CI->getValue().getRawData(); + for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { + uint64_t Val; + if (TD->isBigEndian()) + Val = RawData[e - i - 1]; + else + Val = RawData[i]; + + if (TAI->getData64bitsDirective(AddrSpace)) + O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n'; + else if (TD->isBigEndian()) { + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " Double-word most significant word " << Val; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " Double-word least significant word " << Val; + O << '\n'; + } else { + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " Double-word least significant word " << Val; + O << '\n'; + O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32); + if (VerboseAsm) + O << '\t' << TAI->getCommentString() + << " Double-word most significant word " << Val; + O << '\n'; + } + } +} + +/// EmitGlobalConstant - Print a general LLVM constant to the .s file. +void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { + const TargetData *TD = TM.getTargetData(); + const Type *type = CV->getType(); + unsigned Size = TD->getTypeAllocSize(type); + + if (CV->isNullValue() || isa<UndefValue>(CV)) { + EmitZeros(Size, AddrSpace); + return; + } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) { + EmitGlobalConstantArray(CVA , AddrSpace); + return; + } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) { + EmitGlobalConstantStruct(CVS, AddrSpace); + return; + } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) { + EmitGlobalConstantFP(CFP, AddrSpace); + return; + } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { + // Small integers are handled below; large integers are handled here. + if (Size > 4) { + EmitGlobalConstantLargeInt(CI, AddrSpace); + return; + } + } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) { + EmitGlobalConstantVector(CP); + return; + } + + printDataDirective(type, AddrSpace); + EmitConstantValueOnly(CV); + if (VerboseAsm) { + if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { + SmallString<40> S; + CI->getValue().toStringUnsigned(S, 16); + O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str(); + } + } + O << '\n'; +} + +void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { + // Target doesn't support this yet! + abort(); +} + +/// PrintSpecial - Print information related to the specified machine instr +/// that is independent of the operand, and may be independent of the instr +/// itself. This can be useful for portably encoding the comment character +/// or other bits of target-specific knowledge into the asmstrings. The +/// syntax used is ${:comment}. Targets can override this to add support +/// for their own strange codes. +void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { + if (!strcmp(Code, "private")) { + O << TAI->getPrivateGlobalPrefix(); + } else if (!strcmp(Code, "comment")) { + if (VerboseAsm) + O << TAI->getCommentString(); + } else if (!strcmp(Code, "uid")) { + // Assign a unique ID to this machine instruction. + static const MachineInstr *LastMI = 0; + static const Function *F = 0; + static unsigned Counter = 0U-1; + + // Comparing the address of MI isn't sufficient, because machineinstrs may + // be allocated to the same address across functions. + const Function *ThisF = MI->getParent()->getParent()->getFunction(); + + // If this is a new machine instruction, bump the counter. + if (LastMI != MI || F != ThisF) { + ++Counter; + LastMI = MI; + F = ThisF; + } + O << Counter; + } else { + cerr << "Unknown special formatter '" << Code + << "' for machine instr: " << *MI; + exit(1); + } +} + +/// processDebugLoc - Processes the debug information of each machine +/// instruction's DebugLoc. +void AsmPrinter::processDebugLoc(DebugLoc DL) { + if (TAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) { + if (!DL.isUnknown()) { + static DebugLocTuple PrevDLT(0, ~0U, ~0U); + DebugLocTuple CurDLT = MF->getDebugLocTuple(DL); + + if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT) + printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col, + DICompileUnit(CurDLT.CompileUnit))); + + PrevDLT = CurDLT; + } + } +} + +/// printInlineAsm - This method formats and prints the specified machine +/// instruction that is an inline asm. +void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { + unsigned NumOperands = MI->getNumOperands(); + + // Count the number of register definitions. + unsigned NumDefs = 0; + for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); + ++NumDefs) + assert(NumDefs != NumOperands-1 && "No asm string?"); + + assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); + + // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. + const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); + + // If this asmstr is empty, just print the #APP/#NOAPP markers. + // These are useful to see where empty asm's wound up. + if (AsmStr[0] == 0) { + O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n'; + return; + } + + O << TAI->getInlineAsmStart() << "\n\t"; + + // The variant of the current asmprinter. + int AsmPrinterVariant = TAI->getAssemblerDialect(); + + int CurVariant = -1; // The number of the {.|.|.} region we are in. + const char *LastEmitted = AsmStr; // One past the last character emitted. + + while (*LastEmitted) { + switch (*LastEmitted) { + default: { + // Not a special case, emit the string section literally. + const char *LiteralEnd = LastEmitted+1; + while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && + *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') + ++LiteralEnd; + if (CurVariant == -1 || CurVariant == AsmPrinterVariant) + O.write(LastEmitted, LiteralEnd-LastEmitted); + LastEmitted = LiteralEnd; + break; + } + case '\n': + ++LastEmitted; // Consume newline character. + O << '\n'; // Indent code with newline. + break; + case '$': { + ++LastEmitted; // Consume '$' character. + bool Done = true; + + // Handle escapes. + switch (*LastEmitted) { + default: Done = false; break; + case '$': // $$ -> $ + if (CurVariant == -1 || CurVariant == AsmPrinterVariant) + O << '$'; + ++LastEmitted; // Consume second '$' character. + break; + case '(': // $( -> same as GCC's { character. + ++LastEmitted; // Consume '(' character. + if (CurVariant != -1) { + cerr << "Nested variants found in inline asm string: '" + << AsmStr << "'\n"; + exit(1); + } + CurVariant = 0; // We're in the first variant now. + break; + case '|': + ++LastEmitted; // consume '|' character. + if (CurVariant == -1) + O << '|'; // this is gcc's behavior for | outside a variant + else + ++CurVariant; // We're in the next variant. + break; + case ')': // $) -> same as GCC's } char. + ++LastEmitted; // consume ')' character. + if (CurVariant == -1) + O << '}'; // this is gcc's behavior for } outside a variant + else + CurVariant = -1; + break; + } + if (Done) break; + + bool HasCurlyBraces = false; + if (*LastEmitted == '{') { // ${variable} + ++LastEmitted; // Consume '{' character. + HasCurlyBraces = true; + } + + // If we have ${:foo}, then this is not a real operand reference, it is a + // "magic" string reference, just like in .td files. Arrange to call + // PrintSpecial. + if (HasCurlyBraces && *LastEmitted == ':') { + ++LastEmitted; + const char *StrStart = LastEmitted; + const char *StrEnd = strchr(StrStart, '}'); + if (StrEnd == 0) { + cerr << "Unterminated ${:foo} operand in inline asm string: '" + << AsmStr << "'\n"; + exit(1); + } + + std::string Val(StrStart, StrEnd); + PrintSpecial(MI, Val.c_str()); + LastEmitted = StrEnd+1; + break; + } + + const char *IDStart = LastEmitted; + char *IDEnd; + errno = 0; + long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. + if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { + cerr << "Bad $ operand number in inline asm string: '" + << AsmStr << "'\n"; + exit(1); + } + LastEmitted = IDEnd; + + char Modifier[2] = { 0, 0 }; + + if (HasCurlyBraces) { + // If we have curly braces, check for a modifier character. This + // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. + if (*LastEmitted == ':') { + ++LastEmitted; // Consume ':' character. + if (*LastEmitted == 0) { + cerr << "Bad ${:} expression in inline asm string: '" + << AsmStr << "'\n"; + exit(1); + } + + Modifier[0] = *LastEmitted; + ++LastEmitted; // Consume modifier character. + } + + if (*LastEmitted != '}') { + cerr << "Bad ${} expression in inline asm string: '" + << AsmStr << "'\n"; + exit(1); + } + ++LastEmitted; // Consume '}' character. + } + + if ((unsigned)Val >= NumOperands-1) { + cerr << "Invalid $ operand number in inline asm string: '" + << AsmStr << "'\n"; + exit(1); + } + + // Okay, we finally have a value number. Ask the target to print this + // operand! + if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { + unsigned OpNo = 1; + + bool Error = false; + + // Scan to find the machine operand number for the operand. + for (; Val; --Val) { + if (OpNo >= MI->getNumOperands()) break; + unsigned OpFlags = MI->getOperand(OpNo).getImm(); + OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; + } + + if (OpNo >= MI->getNumOperands()) { + Error = true; + } else { + unsigned OpFlags = MI->getOperand(OpNo).getImm(); + ++OpNo; // Skip over the ID number. + + if (Modifier[0]=='l') // labels are target independent + printBasicBlockLabel(MI->getOperand(OpNo).getMBB(), + false, false, false); + else { + AsmPrinter *AP = const_cast<AsmPrinter*>(this); + if ((OpFlags & 7) == 4) { + Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, + Modifier[0] ? Modifier : 0); + } else { + Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, + Modifier[0] ? Modifier : 0); + } + } + } + if (Error) { + cerr << "Invalid operand found in inline asm: '" + << AsmStr << "'\n"; + MI->dump(); + exit(1); + } + } + break; + } + } + } + O << "\n\t" << TAI->getInlineAsmEnd() << '\n'; +} + +/// printImplicitDef - This method prints the specified machine instruction +/// that is an implicit def. +void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { + if (VerboseAsm) + O << '\t' << TAI->getCommentString() << " implicit-def: " + << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n'; +} + +/// printLabel - This method prints a local label used by debug and +/// exception handling tables. +void AsmPrinter::printLabel(const MachineInstr *MI) const { + printLabel(MI->getOperand(0).getImm()); +} + +void AsmPrinter::printLabel(unsigned Id) const { + O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n"; +} + +/// printDeclare - This method prints a local variable declaration used by +/// debug tables. +/// FIXME: It doesn't really print anything rather it inserts a DebugVariable +/// entry into dwarf table. +void AsmPrinter::printDeclare(const MachineInstr *MI) const { + unsigned FI = MI->getOperand(0).getIndex(); + GlobalValue *GV = MI->getOperand(1).getGlobal(); + DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI); +} + +/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM +/// instruction, using the specified assembler variant. Targets should +/// overried this to format as appropriate. +bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, + unsigned AsmVariant, const char *ExtraCode) { + // Target doesn't support this yet! + return true; +} + +bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, + unsigned AsmVariant, + const char *ExtraCode) { + // Target doesn't support this yet! + return true; +} + +/// printBasicBlockLabel - This method prints the label for the specified +/// MachineBasicBlock +void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB, + bool printAlign, + bool printColon, + bool printComment) const { + if (printAlign) { + unsigned Align = MBB->getAlignment(); + if (Align) + EmitAlignment(Log2_32(Align)); + } + + O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_' + << MBB->getNumber(); + if (printColon) + O << ':'; + if (printComment && MBB->getBasicBlock()) + O << '\t' << TAI->getCommentString() << ' ' + << MBB->getBasicBlock()->getNameStart(); +} + +/// printPICJumpTableSetLabel - This method prints a set label for the +/// specified MachineBasicBlock for a jumptable entry. +void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, + const MachineBasicBlock *MBB) const { + if (!TAI->getSetDirective()) + return; + + O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() + << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','; + printBasicBlockLabel(MBB, false, false, false); + O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() + << '_' << uid << '\n'; +} + +void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, + const MachineBasicBlock *MBB) const { + if (!TAI->getSetDirective()) + return; + + O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() + << getFunctionNumber() << '_' << uid << '_' << uid2 + << "_set_" << MBB->getNumber() << ','; + printBasicBlockLabel(MBB, false, false, false); + O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() + << '_' << uid << '_' << uid2 << '\n'; +} + +/// printDataDirective - This method prints the asm directive for the +/// specified type. +void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) { + const TargetData *TD = TM.getTargetData(); + switch (type->getTypeID()) { + case Type::IntegerTyID: { + unsigned BitWidth = cast<IntegerType>(type)->getBitWidth(); + if (BitWidth <= 8) + O << TAI->getData8bitsDirective(AddrSpace); + else if (BitWidth <= 16) + O << TAI->getData16bitsDirective(AddrSpace); + else if (BitWidth <= 32) + O << TAI->getData32bitsDirective(AddrSpace); + else if (BitWidth <= 64) { + assert(TAI->getData64bitsDirective(AddrSpace) && + "Target cannot handle 64-bit constant exprs!"); + O << TAI->getData64bitsDirective(AddrSpace); + } else { + assert(0 && "Target cannot handle given data directive width!"); + } + break; + } + case Type::PointerTyID: + if (TD->getPointerSize() == 8) { + assert(TAI->getData64bitsDirective(AddrSpace) && + "Target cannot handle 64-bit pointer exprs!"); + O << TAI->getData64bitsDirective(AddrSpace); + } else if (TD->getPointerSize() == 2) { + O << TAI->getData16bitsDirective(AddrSpace); + } else if (TD->getPointerSize() == 1) { + O << TAI->getData8bitsDirective(AddrSpace); + } else { + O << TAI->getData32bitsDirective(AddrSpace); + } + break; + case Type::FloatTyID: case Type::DoubleTyID: + case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID: + assert (0 && "Should have already output floating point constant."); + default: + assert (0 && "Can't handle printing this type of thing"); + break; + } +} + +void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix, + const char *Prefix) { + if (Name[0]=='\"') + O << '\"'; + O << TAI->getPrivateGlobalPrefix(); + if (Prefix) O << Prefix; + if (Name[0]=='\"') + O << '\"'; + if (Name[0]=='\"') + O << Name[1]; + else + O << Name; + O << Suffix; + if (Name[0]=='\"') + O << '\"'; +} + +void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) { + printSuffixedName(Name.c_str(), Suffix); +} + +void AsmPrinter::printVisibility(const std::string& Name, + unsigned Visibility) const { + if (Visibility == GlobalValue::HiddenVisibility) { + if (const char *Directive = TAI->getHiddenDirective()) + O << Directive << Name << '\n'; + } else if (Visibility == GlobalValue::ProtectedVisibility) { + if (const char *Directive = TAI->getProtectedDirective()) + O << Directive << Name << '\n'; + } +} + +void AsmPrinter::printOffset(int64_t Offset) const { + if (Offset > 0) + O << '+' << Offset; + else if (Offset < 0) + O << Offset; +} + +GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { + if (!S->usesMetadata()) + return 0; + + gcp_iterator GCPI = GCMetadataPrinters.find(S); + if (GCPI != GCMetadataPrinters.end()) + return GCPI->second; + + const char *Name = S->getName().c_str(); + + for (GCMetadataPrinterRegistry::iterator + I = GCMetadataPrinterRegistry::begin(), + E = GCMetadataPrinterRegistry::end(); I != E; ++I) + if (strcmp(Name, I->getName()) == 0) { + GCMetadataPrinter *GMP = I->instantiate(); + GMP->S = S; + GCMetadataPrinters.insert(std::make_pair(S, GMP)); + return GMP; + } + + cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n"; + abort(); +} |
