| //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=// |
| // |
| // 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 PowerPC assembly language. This printer is |
| // the output mechanism used by `llc'. |
| // |
| // Documentation at http://developer.apple.com/documentation/DeveloperTools/ |
| // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "asmprinter" |
| #include "PPC.h" |
| #include "PPCPredicates.h" |
| #include "PPCTargetMachine.h" |
| #include "PPCSubtarget.h" |
| #include "llvm/Constants.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/Assembly/Writer.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/CodeGen/DwarfWriter.h" |
| #include "llvm/CodeGen/MachineModuleInfo.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/Support/Mangler.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Target/TargetAsmInfo.h" |
| #include "llvm/Target/MRegisterInfo.h" |
| #include "llvm/Target/TargetInstrInfo.h" |
| #include "llvm/Target/TargetOptions.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include <set> |
| using namespace llvm; |
| |
| STATISTIC(EmittedInsts, "Number of machine instrs printed"); |
| |
| namespace { |
| struct VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter { |
| std::set<std::string> FnStubs, GVStubs; |
| const PPCSubtarget &Subtarget; |
| |
| PPCAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T) |
| : AsmPrinter(O, TM, T), Subtarget(TM.getSubtarget<PPCSubtarget>()) { |
| } |
| |
| virtual const char *getPassName() const { |
| return "PowerPC Assembly Printer"; |
| } |
| |
| PPCTargetMachine &getTM() { |
| return static_cast<PPCTargetMachine&>(TM); |
| } |
| |
| unsigned enumRegToMachineReg(unsigned enumReg) { |
| switch (enumReg) { |
| default: assert(0 && "Unhandled register!"); break; |
| case PPC::CR0: return 0; |
| case PPC::CR1: return 1; |
| case PPC::CR2: return 2; |
| case PPC::CR3: return 3; |
| case PPC::CR4: return 4; |
| case PPC::CR5: return 5; |
| case PPC::CR6: return 6; |
| case PPC::CR7: return 7; |
| } |
| abort(); |
| } |
| |
| /// printInstruction - This method is automatically generated by tablegen |
| /// from the instruction set description. This method returns true if the |
| /// machine instruction was sufficiently described to print it, otherwise it |
| /// returns false. |
| bool printInstruction(const MachineInstr *MI); |
| |
| void printMachineInstruction(const MachineInstr *MI); |
| void printOp(const MachineOperand &MO); |
| |
| /// stripRegisterPrefix - This method strips the character prefix from a |
| /// register name so that only the number is left. Used by for linux asm. |
| const char *stripRegisterPrefix(const char *RegName) { |
| switch (RegName[0]) { |
| case 'r': |
| case 'f': |
| case 'v': return RegName + 1; |
| case 'c': if (RegName[1] == 'r') return RegName + 2; |
| } |
| |
| return RegName; |
| } |
| |
| /// printRegister - Print register according to target requirements. |
| /// |
| void printRegister(const MachineOperand &MO, bool R0AsZero) { |
| unsigned RegNo = MO.getReg(); |
| assert(MRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??"); |
| |
| // If we should use 0 for R0. |
| if (R0AsZero && RegNo == PPC::R0) { |
| O << "0"; |
| return; |
| } |
| |
| const char *RegName = TM.getRegisterInfo()->get(RegNo).Name; |
| // Linux assembler (Others?) does not take register mnemonics. |
| // FIXME - What about special registers used in mfspr/mtspr? |
| if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName); |
| O << RegName; |
| } |
| |
| void printOperand(const MachineInstr *MI, unsigned OpNo) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| if (MO.isRegister()) { |
| printRegister(MO, false); |
| } else if (MO.isImmediate()) { |
| O << MO.getImmedValue(); |
| } else { |
| printOp(MO); |
| } |
| } |
| |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode); |
| bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode); |
| |
| |
| void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| char value = MI->getOperand(OpNo).getImmedValue(); |
| value = (value << (32-5)) >> (32-5); |
| O << (int)value; |
| } |
| void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| unsigned char value = MI->getOperand(OpNo).getImmedValue(); |
| assert(value <= 31 && "Invalid u5imm argument!"); |
| O << (unsigned int)value; |
| } |
| void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| unsigned char value = MI->getOperand(OpNo).getImmedValue(); |
| assert(value <= 63 && "Invalid u6imm argument!"); |
| O << (unsigned int)value; |
| } |
| void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| O << (short)MI->getOperand(OpNo).getImmedValue(); |
| } |
| void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| O << (unsigned short)MI->getOperand(OpNo).getImmedValue(); |
| } |
| void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| if (MI->getOperand(OpNo).isImmediate()) { |
| O << (short)(MI->getOperand(OpNo).getImmedValue()*4); |
| } else { |
| O << "lo16("; |
| printOp(MI->getOperand(OpNo)); |
| if (TM.getRelocationModel() == Reloc::PIC_) |
| O << "-\"L" << getFunctionNumber() << "$pb\")"; |
| else |
| O << ')'; |
| } |
| } |
| void printBranchOperand(const MachineInstr *MI, unsigned OpNo) { |
| // Branches can take an immediate operand. This is used by the branch |
| // selection pass to print $+8, an eight byte displacement from the PC. |
| if (MI->getOperand(OpNo).isImmediate()) { |
| O << "$+" << MI->getOperand(OpNo).getImmedValue()*4; |
| } else { |
| printOp(MI->getOperand(OpNo)); |
| } |
| } |
| void printCallOperand(const MachineInstr *MI, unsigned OpNo) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| if (TM.getRelocationModel() != Reloc::Static) { |
| if (MO.getType() == MachineOperand::MO_GlobalAddress) { |
| GlobalValue *GV = MO.getGlobal(); |
| if (((GV->isDeclaration() || GV->hasWeakLinkage() || |
| GV->hasLinkOnceLinkage()))) { |
| // Dynamically-resolved functions need a stub for the function. |
| std::string Name = Mang->getValueName(GV); |
| FnStubs.insert(Name); |
| O << "L" << Name << "$stub"; |
| if (GV->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(GV); |
| return; |
| } |
| } |
| if (MO.getType() == MachineOperand::MO_ExternalSymbol) { |
| std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); |
| FnStubs.insert(Name); |
| O << "L" << Name << "$stub"; |
| return; |
| } |
| } |
| |
| printOp(MI->getOperand(OpNo)); |
| } |
| void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) { |
| O << (int)MI->getOperand(OpNo).getImmedValue()*4; |
| } |
| void printPICLabel(const MachineInstr *MI, unsigned OpNo) { |
| O << "\"L" << getFunctionNumber() << "$pb\"\n"; |
| O << "\"L" << getFunctionNumber() << "$pb\":"; |
| } |
| void printSymbolHi(const MachineInstr *MI, unsigned OpNo) { |
| if (MI->getOperand(OpNo).isImmediate()) { |
| printS16ImmOperand(MI, OpNo); |
| } else { |
| if (Subtarget.isDarwin()) O << "ha16("; |
| printOp(MI->getOperand(OpNo)); |
| if (TM.getRelocationModel() == Reloc::PIC_) |
| O << "-\"L" << getFunctionNumber() << "$pb\""; |
| if (Subtarget.isDarwin()) |
| O << ')'; |
| else |
| O << "@ha"; |
| } |
| } |
| void printSymbolLo(const MachineInstr *MI, unsigned OpNo) { |
| if (MI->getOperand(OpNo).isImmediate()) { |
| printS16ImmOperand(MI, OpNo); |
| } else { |
| if (Subtarget.isDarwin()) O << "lo16("; |
| printOp(MI->getOperand(OpNo)); |
| if (TM.getRelocationModel() == Reloc::PIC_) |
| O << "-\"L" << getFunctionNumber() << "$pb\""; |
| if (Subtarget.isDarwin()) |
| O << ')'; |
| else |
| O << "@l"; |
| } |
| } |
| void printcrbitm(const MachineInstr *MI, unsigned OpNo) { |
| unsigned CCReg = MI->getOperand(OpNo).getReg(); |
| unsigned RegNo = enumRegToMachineReg(CCReg); |
| O << (0x80 >> RegNo); |
| } |
| // The new addressing mode printers. |
| void printMemRegImm(const MachineInstr *MI, unsigned OpNo) { |
| printSymbolLo(MI, OpNo); |
| O << '('; |
| if (MI->getOperand(OpNo+1).isRegister() && |
| MI->getOperand(OpNo+1).getReg() == PPC::R0) |
| O << "0"; |
| else |
| printOperand(MI, OpNo+1); |
| O << ')'; |
| } |
| void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) { |
| if (MI->getOperand(OpNo).isImmediate()) |
| printS16X4ImmOperand(MI, OpNo); |
| else |
| printSymbolLo(MI, OpNo); |
| O << '('; |
| if (MI->getOperand(OpNo+1).isRegister() && |
| MI->getOperand(OpNo+1).getReg() == PPC::R0) |
| O << "0"; |
| else |
| printOperand(MI, OpNo+1); |
| O << ')'; |
| } |
| |
| void printMemRegReg(const MachineInstr *MI, unsigned OpNo) { |
| // When used as the base register, r0 reads constant zero rather than |
| // the value contained in the register. For this reason, the darwin |
| // assembler requires that we print r0 as 0 (no r) when used as the base. |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| printRegister(MO, true); |
| O << ", "; |
| printOperand(MI, OpNo+1); |
| } |
| |
| void printPredicateOperand(const MachineInstr *MI, unsigned OpNo, |
| const char *Modifier); |
| |
| virtual bool runOnMachineFunction(MachineFunction &F) = 0; |
| virtual bool doFinalization(Module &M) = 0; |
| |
| virtual void EmitExternalGlobal(const GlobalVariable *GV); |
| }; |
| |
| /// LinuxAsmPrinter - PowerPC assembly printer, customized for Linux |
| struct VISIBILITY_HIDDEN LinuxAsmPrinter : public PPCAsmPrinter { |
| |
| DwarfWriter DW; |
| |
| LinuxAsmPrinter(std::ostream &O, PPCTargetMachine &TM, |
| const TargetAsmInfo *T) |
| : PPCAsmPrinter(O, TM, T), DW(O, this, T) { |
| } |
| |
| virtual const char *getPassName() const { |
| return "Linux PPC Assembly Printer"; |
| } |
| |
| bool runOnMachineFunction(MachineFunction &F); |
| bool doInitialization(Module &M); |
| bool doFinalization(Module &M); |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.setPreservesAll(); |
| AU.addRequired<MachineModuleInfo>(); |
| PPCAsmPrinter::getAnalysisUsage(AU); |
| } |
| |
| /// getSectionForFunction - Return the section that we should emit the |
| /// specified function body into. |
| virtual std::string getSectionForFunction(const Function &F) const; |
| }; |
| |
| /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS |
| /// X |
| struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter { |
| |
| DwarfWriter DW; |
| MachineModuleInfo *MMI; |
| |
| DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM, |
| const TargetAsmInfo *T) |
| : PPCAsmPrinter(O, TM, T), DW(O, this, T), MMI(0) { |
| } |
| |
| virtual const char *getPassName() const { |
| return "Darwin PPC Assembly Printer"; |
| } |
| |
| bool runOnMachineFunction(MachineFunction &F); |
| bool doInitialization(Module &M); |
| bool doFinalization(Module &M); |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.setPreservesAll(); |
| AU.addRequired<MachineModuleInfo>(); |
| PPCAsmPrinter::getAnalysisUsage(AU); |
| } |
| |
| /// getSectionForFunction - Return the section that we should emit the |
| /// specified function body into. |
| virtual std::string getSectionForFunction(const Function &F) const; |
| }; |
| } // end of anonymous namespace |
| |
| // Include the auto-generated portion of the assembly writer |
| #include "PPCGenAsmWriter.inc" |
| |
| void PPCAsmPrinter::printOp(const MachineOperand &MO) { |
| switch (MO.getType()) { |
| case MachineOperand::MO_Immediate: |
| cerr << "printOp() does not handle immediate values\n"; |
| abort(); |
| return; |
| |
| case MachineOperand::MO_MachineBasicBlock: |
| printBasicBlockLabel(MO.getMachineBasicBlock()); |
| return; |
| case MachineOperand::MO_JumpTableIndex: |
| O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() |
| << '_' << MO.getJumpTableIndex(); |
| // FIXME: PIC relocation model |
| return; |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() |
| << '_' << MO.getConstantPoolIndex(); |
| return; |
| case MachineOperand::MO_ExternalSymbol: |
| // Computing the address of an external symbol, not calling it. |
| if (TM.getRelocationModel() != Reloc::Static) { |
| std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); |
| GVStubs.insert(Name); |
| O << "L" << Name << "$non_lazy_ptr"; |
| return; |
| } |
| O << TAI->getGlobalPrefix() << MO.getSymbolName(); |
| return; |
| case MachineOperand::MO_GlobalAddress: { |
| // Computing the address of a global symbol, not calling it. |
| GlobalValue *GV = MO.getGlobal(); |
| std::string Name = Mang->getValueName(GV); |
| |
| // External or weakly linked global variables need non-lazily-resolved stubs |
| if (TM.getRelocationModel() != Reloc::Static) { |
| if (((GV->isDeclaration() || GV->hasWeakLinkage() || |
| GV->hasLinkOnceLinkage()))) { |
| GVStubs.insert(Name); |
| O << "L" << Name << "$non_lazy_ptr"; |
| return; |
| } |
| } |
| O << Name; |
| |
| if (MO.getOffset() > 0) |
| O << "+" << MO.getOffset(); |
| else if (MO.getOffset() < 0) |
| O << MO.getOffset(); |
| |
| if (GV->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(GV); |
| return; |
| } |
| |
| default: |
| O << "<unknown operand type: " << MO.getType() << ">"; |
| return; |
| } |
| } |
| |
| /// EmitExternalGlobal - In this case we need to use the indirect symbol. |
| /// |
| void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) { |
| std::string Name = getGlobalLinkName(GV); |
| if (TM.getRelocationModel() != Reloc::Static) { |
| GVStubs.insert(Name); |
| O << "L" << Name << "$non_lazy_ptr"; |
| return; |
| } |
| O << Name; |
| } |
| |
| /// PrintAsmOperand - Print out an operand for an inline asm expression. |
| /// |
| bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode) { |
| // Does this asm operand have a single letter operand modifier? |
| if (ExtraCode && ExtraCode[0]) { |
| if (ExtraCode[1] != 0) return true; // Unknown modifier. |
| |
| switch (ExtraCode[0]) { |
| default: return true; // Unknown modifier. |
| case 'c': // Don't print "$" before a global var name or constant. |
| // PPC never has a prefix. |
| printOperand(MI, OpNo); |
| return false; |
| case 'L': // Write second word of DImode reference. |
| // Verify that this operand has two consecutive registers. |
| if (!MI->getOperand(OpNo).isRegister() || |
| OpNo+1 == MI->getNumOperands() || |
| !MI->getOperand(OpNo+1).isRegister()) |
| return true; |
| ++OpNo; // Return the high-part. |
| break; |
| case 'I': |
| // Write 'i' if an integer constant, otherwise nothing. Used to print |
| // addi vs add, etc. |
| if (MI->getOperand(OpNo).isImmediate()) |
| O << "i"; |
| return false; |
| } |
| } |
| |
| printOperand(MI, OpNo); |
| return false; |
| } |
| |
| bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode) { |
| if (ExtraCode && ExtraCode[0]) |
| return true; // Unknown modifier. |
| if (MI->getOperand(OpNo).isRegister()) |
| printMemRegReg(MI, OpNo); |
| else |
| printMemRegImm(MI, OpNo); |
| return false; |
| } |
| |
| void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo, |
| const char *Modifier) { |
| assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!"); |
| unsigned Code = MI->getOperand(OpNo).getImm(); |
| if (!strcmp(Modifier, "cc")) { |
| switch ((PPC::Predicate)Code) { |
| case PPC::PRED_ALWAYS: return; // Don't print anything for always. |
| case PPC::PRED_LT: O << "lt"; return; |
| case PPC::PRED_LE: O << "le"; return; |
| case PPC::PRED_EQ: O << "eq"; return; |
| case PPC::PRED_GE: O << "ge"; return; |
| case PPC::PRED_GT: O << "gt"; return; |
| case PPC::PRED_NE: O << "ne"; return; |
| case PPC::PRED_UN: O << "un"; return; |
| case PPC::PRED_NU: O << "nu"; return; |
| } |
| |
| } else { |
| assert(!strcmp(Modifier, "reg") && |
| "Need to specify 'cc' or 'reg' as predicate op modifier!"); |
| // Don't print the register for 'always'. |
| if (Code == PPC::PRED_ALWAYS) return; |
| printOperand(MI, OpNo+1); |
| } |
| } |
| |
| |
| /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to |
| /// the current output stream. |
| /// |
| void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { |
| ++EmittedInsts; |
| |
| // Check for slwi/srwi mnemonics. |
| if (MI->getOpcode() == PPC::RLWINM) { |
| bool FoundMnemonic = false; |
| unsigned char SH = MI->getOperand(2).getImmedValue(); |
| unsigned char MB = MI->getOperand(3).getImmedValue(); |
| unsigned char ME = MI->getOperand(4).getImmedValue(); |
| if (SH <= 31 && MB == 0 && ME == (31-SH)) { |
| O << "slwi "; FoundMnemonic = true; |
| } |
| if (SH <= 31 && MB == (32-SH) && ME == 31) { |
| O << "srwi "; FoundMnemonic = true; |
| SH = 32-SH; |
| } |
| if (FoundMnemonic) { |
| printOperand(MI, 0); |
| O << ", "; |
| printOperand(MI, 1); |
| O << ", " << (unsigned int)SH << "\n"; |
| return; |
| } |
| } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) { |
| if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) { |
| O << "mr "; |
| printOperand(MI, 0); |
| O << ", "; |
| printOperand(MI, 1); |
| O << "\n"; |
| return; |
| } |
| } else if (MI->getOpcode() == PPC::RLDICR) { |
| unsigned char SH = MI->getOperand(2).getImmedValue(); |
| unsigned char ME = MI->getOperand(3).getImmedValue(); |
| // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH |
| if (63-SH == ME) { |
| O << "sldi "; |
| printOperand(MI, 0); |
| O << ", "; |
| printOperand(MI, 1); |
| O << ", " << (unsigned int)SH << "\n"; |
| return; |
| } |
| } |
| |
| if (printInstruction(MI)) |
| return; // Printer was automatically generated |
| |
| assert(0 && "Unhandled instruction in asm writer!"); |
| abort(); |
| return; |
| } |
| |
| /// runOnMachineFunction - This uses the printMachineInstruction() |
| /// method to print assembly for each instruction. |
| /// |
| bool LinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) { |
| DW.SetModuleInfo(&getAnalysis<MachineModuleInfo>()); |
| |
| SetupMachineFunction(MF); |
| O << "\n\n"; |
| |
| // Print out constants referenced by the function |
| EmitConstantPool(MF.getConstantPool()); |
| |
| // Print out labels for the function. |
| const Function *F = MF.getFunction(); |
| SwitchToTextSection(getSectionForFunction(*F).c_str(), F); |
| |
| switch (F->getLinkage()) { |
| default: assert(0 && "Unknown linkage type!"); |
| case Function::InternalLinkage: // Symbols default to internal. |
| break; |
| case Function::ExternalLinkage: |
| O << "\t.global\t" << CurrentFnName << '\n' |
| << "\t.type\t" << CurrentFnName << ", @function\n"; |
| break; |
| case Function::WeakLinkage: |
| case Function::LinkOnceLinkage: |
| O << "\t.global\t" << CurrentFnName << '\n'; |
| O << "\t.weak\t" << CurrentFnName << '\n'; |
| break; |
| } |
| |
| if (F->hasHiddenVisibility()) |
| if (const char *Directive = TAI->getHiddenDirective()) |
| O << Directive << CurrentFnName << "\n"; |
| |
| EmitAlignment(2, F); |
| O << CurrentFnName << ":\n"; |
| |
| // 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); |
| 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); |
| } |
| } |
| |
| O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << "\n"; |
| |
| // Print out jump tables referenced by the function. |
| EmitJumpTableInfo(MF.getJumpTableInfo(), MF); |
| |
| // Emit post-function debug information. |
| DW.EndFunction(); |
| |
| // We didn't modify anything. |
| return false; |
| } |
| |
| bool LinuxAsmPrinter::doInitialization(Module &M) { |
| bool Result = AsmPrinter::doInitialization(M); |
| |
| // GNU as handles section names wrapped in quotes |
| Mang->setUseQuotes(true); |
| |
| SwitchToTextSection(TAI->getTextSection()); |
| |
| // Emit initial debug information. |
| DW.BeginModule(&M); |
| return Result; |
| } |
| |
| bool LinuxAsmPrinter::doFinalization(Module &M) { |
| const TargetData *TD = TM.getTargetData(); |
| |
| // Print out module-level global variables here. |
| for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); |
| I != E; ++I) { |
| if (!I->hasInitializer()) continue; // External global require no code |
| |
| // Check to see if this is a special global used by LLVM, if so, emit it. |
| if (EmitSpecialLLVMGlobal(I)) |
| continue; |
| |
| std::string name = Mang->getValueName(I); |
| |
| if (I->hasHiddenVisibility()) |
| if (const char *Directive = TAI->getHiddenDirective()) |
| O << Directive << name << "\n"; |
| |
| Constant *C = I->getInitializer(); |
| unsigned Size = TD->getABITypeSize(C->getType()); |
| unsigned Align = TD->getPreferredAlignmentLog(I); |
| |
| if (C->isNullValue() && /* FIXME: Verify correct */ |
| !I->hasSection() && |
| (I->hasInternalLinkage() || I->hasWeakLinkage() || |
| I->hasLinkOnceLinkage() || I->hasExternalLinkage())) { |
| if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. |
| if (I->hasExternalLinkage()) { |
| O << "\t.global " << name << '\n'; |
| O << "\t.type " << name << ", @object\n"; |
| if (TAI->getBSSSection()) |
| SwitchToDataSection(TAI->getBSSSection(), I); |
| O << name << ":\n"; |
| O << "\t.zero " << Size << "\n"; |
| } else if (I->hasInternalLinkage()) { |
| SwitchToDataSection("\t.data", I); |
| O << TAI->getLCOMMDirective() << name << "," << Size; |
| } else { |
| SwitchToDataSection("\t.data", I); |
| O << ".comm " << name << "," << Size; |
| } |
| O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n"; |
| } else { |
| switch (I->getLinkage()) { |
| case GlobalValue::LinkOnceLinkage: |
| case GlobalValue::WeakLinkage: |
| O << "\t.global " << name << '\n' |
| << "\t.type " << name << ", @object\n" |
| << "\t.weak " << name << '\n'; |
| SwitchToDataSection("\t.data", I); |
| break; |
| case GlobalValue::AppendingLinkage: |
| // FIXME: appending linkage variables should go into a section of |
| // their name or something. For now, just emit them as external. |
| case GlobalValue::ExternalLinkage: |
| // If external or appending, declare as a global symbol |
| O << "\t.global " << name << "\n" |
| << "\t.type " << name << ", @object\n"; |
| // FALL THROUGH |
| case GlobalValue::InternalLinkage: |
| if (I->isConstant()) { |
| const ConstantArray *CVA = dyn_cast<ConstantArray>(C); |
| if (TAI->getCStringSection() && CVA && CVA->isCString()) { |
| SwitchToDataSection(TAI->getCStringSection(), I); |
| break; |
| } |
| } |
| |
| // FIXME: special handling for ".ctors" & ".dtors" sections |
| if (I->hasSection() && |
| (I->getSection() == ".ctors" || |
| I->getSection() == ".dtors")) { |
| std::string SectionName = ".section " + I->getSection() |
| + ",\"aw\",@progbits"; |
| SwitchToDataSection(SectionName.c_str()); |
| } else { |
| if (I->isConstant() && TAI->getReadOnlySection()) |
| SwitchToDataSection(TAI->getReadOnlySection(), I); |
| else |
| SwitchToDataSection(TAI->getDataSection(), I); |
| } |
| break; |
| default: |
| cerr << "Unknown linkage type!"; |
| abort(); |
| } |
| |
| EmitAlignment(Align, I); |
| O << name << ":\t\t\t\t" << TAI->getCommentString() << " '" |
| << I->getName() << "'\n"; |
| |
| // If the initializer is a extern weak symbol, remember to emit the weak |
| // reference! |
| if (const GlobalValue *GV = dyn_cast<GlobalValue>(C)) |
| if (GV->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(GV); |
| |
| EmitGlobalConstant(C); |
| O << '\n'; |
| } |
| } |
| |
| // TODO |
| |
| // Emit initial debug information. |
| DW.EndModule(); |
| |
| return AsmPrinter::doFinalization(M); |
| } |
| |
| std::string LinuxAsmPrinter::getSectionForFunction(const Function &F) const { |
| switch (F.getLinkage()) { |
| default: assert(0 && "Unknown linkage type!"); |
| case Function::ExternalLinkage: |
| case Function::InternalLinkage: return TAI->getTextSection(); |
| case Function::WeakLinkage: |
| case Function::LinkOnceLinkage: |
| return ".text"; |
| } |
| } |
| |
| std::string DarwinAsmPrinter::getSectionForFunction(const Function &F) const { |
| switch (F.getLinkage()) { |
| default: assert(0 && "Unknown linkage type!"); |
| case Function::ExternalLinkage: |
| case Function::InternalLinkage: return TAI->getTextSection(); |
| case Function::WeakLinkage: |
| case Function::LinkOnceLinkage: |
| return ".section __TEXT,__textcoal_nt,coalesced,pure_instructions"; |
| } |
| } |
| |
| /// runOnMachineFunction - This uses the printMachineInstruction() |
| /// method to print assembly for each instruction. |
| /// |
| bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { |
| // We need this for Personality functions. |
| MMI = &getAnalysis<MachineModuleInfo>(); |
| DW.SetModuleInfo(MMI); |
| |
| SetupMachineFunction(MF); |
| O << "\n\n"; |
| |
| // Print out constants referenced by the function |
| EmitConstantPool(MF.getConstantPool()); |
| |
| // Print out labels for the function. |
| const Function *F = MF.getFunction(); |
| SwitchToTextSection(getSectionForFunction(*F).c_str(), F); |
| |
| switch (F->getLinkage()) { |
| default: assert(0 && "Unknown linkage type!"); |
| case Function::InternalLinkage: // Symbols default to internal. |
| break; |
| case Function::ExternalLinkage: |
| O << "\t.globl\t" << CurrentFnName << "\n"; |
| break; |
| case Function::WeakLinkage: |
| case Function::LinkOnceLinkage: |
| O << "\t.globl\t" << CurrentFnName << "\n"; |
| O << "\t.weak_definition\t" << CurrentFnName << "\n"; |
| break; |
| } |
| |
| if (F->hasHiddenVisibility()) |
| if (const char *Directive = TAI->getHiddenDirective()) |
| O << Directive << CurrentFnName << "\n"; |
| |
| EmitAlignment(4, F); |
| O << CurrentFnName << ":\n"; |
| |
| // 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); |
| 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); |
| } |
| } |
| |
| // Print out jump tables referenced by the function. |
| EmitJumpTableInfo(MF.getJumpTableInfo(), MF); |
| |
| // Emit post-function debug information. |
| DW.EndFunction(); |
| |
| // We didn't modify anything. |
| return false; |
| } |
| |
| |
| bool DarwinAsmPrinter::doInitialization(Module &M) { |
| static const char *CPUDirectives[] = { |
| "ppc", |
| "ppc601", |
| "ppc602", |
| "ppc603", |
| "ppc7400", |
| "ppc750", |
| "ppc970", |
| "ppc64" |
| }; |
| |
| unsigned Directive = Subtarget.getDarwinDirective(); |
| if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970) |
| Directive = PPC::DIR_970; |
| if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400) |
| Directive = PPC::DIR_7400; |
| if (Subtarget.isPPC64() && Directive < PPC::DIR_970) |
| Directive = PPC::DIR_64; |
| assert(Directive <= PPC::DIR_64 && "Directive out of range."); |
| O << "\t.machine " << CPUDirectives[Directive] << "\n"; |
| |
| bool Result = AsmPrinter::doInitialization(M); |
| |
| // Darwin wants symbols to be quoted if they have complex names. |
| Mang->setUseQuotes(true); |
| |
| // Prime text sections so they are adjacent. This reduces the likelihood a |
| // large data or debug section causes a branch to exceed 16M limit. |
| SwitchToTextSection(".section __TEXT,__textcoal_nt,coalesced," |
| "pure_instructions"); |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," |
| "pure_instructions,32"); |
| } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) { |
| SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," |
| "pure_instructions,16"); |
| } |
| SwitchToTextSection(TAI->getTextSection()); |
| |
| // Emit initial debug information. |
| DW.BeginModule(&M); |
| return Result; |
| } |
| |
| bool DarwinAsmPrinter::doFinalization(Module &M) { |
| const TargetData *TD = TM.getTargetData(); |
| |
| // Print out module-level global variables here. |
| for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); |
| I != E; ++I) { |
| if (!I->hasInitializer()) continue; // External global require no code |
| |
| // Check to see if this is a special global used by LLVM, if so, emit it. |
| if (EmitSpecialLLVMGlobal(I)) { |
| if (TM.getRelocationModel() == Reloc::Static) { |
| if (I->getName() == "llvm.global_ctors") |
| O << ".reference .constructors_used\n"; |
| else if (I->getName() == "llvm.global_dtors") |
| O << ".reference .destructors_used\n"; |
| } |
| continue; |
| } |
| |
| std::string name = Mang->getValueName(I); |
| |
| if (I->hasHiddenVisibility()) |
| if (const char *Directive = TAI->getHiddenDirective()) |
| O << Directive << name << "\n"; |
| |
| Constant *C = I->getInitializer(); |
| const Type *Type = C->getType(); |
| unsigned Size = TD->getABITypeSize(Type); |
| unsigned Align = TD->getPreferredAlignmentLog(I); |
| |
| if (C->isNullValue() && /* FIXME: Verify correct */ |
| !I->hasSection() && |
| (I->hasInternalLinkage() || I->hasWeakLinkage() || |
| I->hasLinkOnceLinkage() || I->hasExternalLinkage())) { |
| if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. |
| if (I->hasExternalLinkage()) { |
| O << "\t.globl " << name << '\n'; |
| O << "\t.zerofill __DATA, __common, " << name << ", " |
| << Size << ", " << Align; |
| } else if (I->hasInternalLinkage()) { |
| SwitchToDataSection("\t.data", I); |
| O << TAI->getLCOMMDirective() << name << "," << Size << "," << Align; |
| } else { |
| SwitchToDataSection("\t.data", I); |
| O << ".comm " << name << "," << Size; |
| } |
| O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n"; |
| } else { |
| switch (I->getLinkage()) { |
| case GlobalValue::LinkOnceLinkage: |
| case GlobalValue::WeakLinkage: |
| O << "\t.globl " << name << '\n' |
| << "\t.weak_definition " << name << '\n'; |
| SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I); |
| break; |
| case GlobalValue::AppendingLinkage: |
| // FIXME: appending linkage variables should go into a section of |
| // their name or something. For now, just emit them as external. |
| case GlobalValue::ExternalLinkage: |
| // If external or appending, declare as a global symbol |
| O << "\t.globl " << name << "\n"; |
| // FALL THROUGH |
| case GlobalValue::InternalLinkage: |
| if (I->isConstant()) { |
| const ConstantArray *CVA = dyn_cast<ConstantArray>(C); |
| if (TAI->getCStringSection() && CVA && CVA->isCString()) { |
| SwitchToDataSection(TAI->getCStringSection(), I); |
| break; |
| } |
| } |
| |
| if (!I->isConstant()) |
| SwitchToDataSection(TAI->getDataSection(), I); |
| else { |
| // Read-only data. |
| bool HasReloc = C->ContainsRelocations(); |
| if (HasReloc && |
| TM.getRelocationModel() != Reloc::Static) |
| SwitchToDataSection("\t.const_data\n"); |
| else if (!HasReloc && Size == 4 && |
| TAI->getFourByteConstantSection()) |
| SwitchToDataSection(TAI->getFourByteConstantSection(), I); |
| else if (!HasReloc && Size == 8 && |
| TAI->getEightByteConstantSection()) |
| SwitchToDataSection(TAI->getEightByteConstantSection(), I); |
| else if (!HasReloc && Size == 16 && |
| TAI->getSixteenByteConstantSection()) |
| SwitchToDataSection(TAI->getSixteenByteConstantSection(), I); |
| else if (TAI->getReadOnlySection()) |
| SwitchToDataSection(TAI->getReadOnlySection(), I); |
| else |
| SwitchToDataSection(TAI->getDataSection(), I); |
| } |
| break; |
| default: |
| cerr << "Unknown linkage type!"; |
| abort(); |
| } |
| |
| EmitAlignment(Align, I); |
| O << name << ":\t\t\t\t" << TAI->getCommentString() << " '" |
| << I->getName() << "'\n"; |
| |
| // If the initializer is a extern weak symbol, remember to emit the weak |
| // reference! |
| if (const GlobalValue *GV = dyn_cast<GlobalValue>(C)) |
| if (GV->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(GV); |
| |
| EmitGlobalConstant(C); |
| O << '\n'; |
| } |
| } |
| |
| bool isPPC64 = TD->getPointerSizeInBits() == 64; |
| |
| // Output stubs for dynamically-linked functions |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); |
| i != e; ++i) { |
| SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," |
| "pure_instructions,32"); |
| EmitAlignment(4); |
| O << "L" << *i << "$stub:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| O << "\tmflr r0\n"; |
| O << "\tbcl 20,31,L0$" << *i << "\n"; |
| O << "L0$" << *i << ":\n"; |
| O << "\tmflr r11\n"; |
| O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; |
| O << "\tmtlr r0\n"; |
| if (isPPC64) |
| O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; |
| else |
| O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; |
| O << "\tmtctr r12\n"; |
| O << "\tbctr\n"; |
| SwitchToDataSection(".lazy_symbol_pointer"); |
| O << "L" << *i << "$lazy_ptr:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| if (isPPC64) |
| O << "\t.quad dyld_stub_binding_helper\n"; |
| else |
| O << "\t.long dyld_stub_binding_helper\n"; |
| } |
| } else { |
| for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); |
| i != e; ++i) { |
| SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," |
| "pure_instructions,16"); |
| EmitAlignment(4); |
| O << "L" << *i << "$stub:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n"; |
| if (isPPC64) |
| O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; |
| else |
| O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; |
| O << "\tmtctr r12\n"; |
| O << "\tbctr\n"; |
| SwitchToDataSection(".lazy_symbol_pointer"); |
| O << "L" << *i << "$lazy_ptr:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| if (isPPC64) |
| O << "\t.quad dyld_stub_binding_helper\n"; |
| else |
| O << "\t.long dyld_stub_binding_helper\n"; |
| } |
| } |
| |
| O << "\n"; |
| |
| if (ExceptionHandling && TAI->doesSupportExceptionHandling() && MMI) { |
| // Add the (possibly multiple) personalities to the set of global values. |
| const std::vector<Function *>& Personalities = MMI->getPersonalities(); |
| |
| for (std::vector<Function *>::const_iterator I = Personalities.begin(), |
| E = Personalities.end(); I != E; ++I) |
| if (*I) GVStubs.insert("_" + (*I)->getName()); |
| } |
| |
| // Output stubs for external and common global variables. |
| if (!GVStubs.empty()) { |
| SwitchToDataSection(".non_lazy_symbol_pointer"); |
| for (std::set<std::string>::iterator I = GVStubs.begin(), |
| E = GVStubs.end(); I != E; ++I) { |
| O << "L" << *I << "$non_lazy_ptr:\n"; |
| O << "\t.indirect_symbol " << *I << "\n"; |
| if (isPPC64) |
| O << "\t.quad\t0\n"; |
| else |
| O << "\t.long\t0\n"; |
| |
| } |
| } |
| |
| // Emit initial debug information. |
| DW.EndModule(); |
| |
| // Funny Darwin hack: This flag tells the linker that no global symbols |
| // contain code that falls through to other global symbols (e.g. the obvious |
| // implementation of multiple entry points). If this doesn't occur, the |
| // linker can safely perform dead code stripping. Since LLVM never generates |
| // code that does this, it is always safe to set. |
| O << "\t.subsections_via_symbols\n"; |
| |
| return AsmPrinter::doFinalization(M); |
| } |
| |
| |
| |
| /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code |
| /// for a MachineFunction to the given output stream, in a format that the |
| /// Darwin assembler can deal with. |
| /// |
| FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o, |
| PPCTargetMachine &tm) { |
| const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>(); |
| |
| if (Subtarget->isDarwin()) { |
| return new DarwinAsmPrinter(o, tm, tm.getTargetAsmInfo()); |
| } else { |
| return new LinuxAsmPrinter(o, tm, tm.getTargetAsmInfo()); |
| } |
| } |
| |