-//===-- X86/Printer.cpp - Convert X86 LLVM code to Intel assembly ---------===//
-//
+//===-- X86AsmPrinter.cpp - Convert X86 LLVM IR to X86 assembly -----------===//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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 Intel-format
-// assembly language. This printer is the output mechanism used
-// by `llc' and `lli -print-machineinstrs' on X86.
+// This file the shared super class printer that converts from our internal
+// representation of machine-dependent LLVM code to Intel and AT&T format
+// assembly language.
+// This printer is the output mechanism used by `llc'.
//
//===----------------------------------------------------------------------===//
+#include "X86ATTAsmPrinter.h"
+#include "X86IntelAsmPrinter.h"
+#include "X86Subtarget.h"
#include "X86.h"
-#include "X86InstrInfo.h"
#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
+#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/MachineConstantPool.h"
-#include "llvm/CodeGen/MachineInstr.h"
-#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
-#include "Support/Statistic.h"
-#include "Support/StringExtras.h"
-#include "Support/CommandLine.h"
-
-namespace llvm {
-
-namespace {
- Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
-
- // FIXME: This should be automatically picked up by autoconf from the C
- // frontend
- cl::opt<bool> EmitCygwin("enable-cygwin-compatible-output", cl::Hidden,
- cl::desc("Emit X86 assembly code suitable for consumption by cygwin"));
-
- struct Printer : public MachineFunctionPass {
- /// Output stream on which we're printing assembly code.
- ///
- std::ostream &O;
-
- /// Target machine description which we query for reg. names, data
- /// layout, etc.
- ///
- TargetMachine &TM;
-
- /// Name-mangler for global names.
- ///
- Mangler *Mang;
-
- Printer(std::ostream &o, TargetMachine &tm) : O(o), TM(tm) { }
-
- /// We name each basic block in a Function with a unique number, so
- /// that we can consistently refer to them later. This is cleared
- /// at the beginning of each call to runOnMachineFunction().
- ///
- typedef std::map<const Value *, unsigned> ValueMapTy;
- ValueMapTy NumberForBB;
-
- /// Cache of mangled name for current function. This is
- /// recalculated at the beginning of each call to
- /// runOnMachineFunction().
- ///
- std::string CurrentFnName;
-
- virtual const char *getPassName() const {
- return "X86 Assembly Printer";
- }
-
- void checkImplUses (const TargetInstrDescriptor &Desc);
- void printMachineInstruction(const MachineInstr *MI);
- void printOp(const MachineOperand &MO,
- bool elideOffsetKeyword = false);
- void printMemReference(const MachineInstr *MI, unsigned Op);
- void printConstantPool(MachineConstantPool *MCP);
- bool runOnMachineFunction(MachineFunction &F);
- bool doInitialization(Module &M);
- bool doFinalization(Module &M);
- void emitGlobalConstant(const Constant* CV);
- void emitConstantValueOnly(const Constant *CV);
- };
-} // end of anonymous namespace
-
-/// createX86CodePrinterPass - Returns a pass that prints the X86
-/// assembly code for a MachineFunction to the given output stream,
-/// using the given target machine description. This should work
-/// regardless of whether the function is in SSA form.
-///
-FunctionPass *createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
- return new Printer(o, tm);
-}
-
-/// isStringCompatible - Can we treat the specified array as a string?
-/// Only if it is an array of ubytes or non-negative sbytes.
-///
-static bool isStringCompatible(const ConstantArray *CVA) {
- const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType();
- if (ETy == Type::UByteTy) return true;
- if (ETy != Type::SByteTy) return false;
-
- for (unsigned i = 0; i < CVA->getNumOperands(); ++i)
- if (cast<ConstantSInt>(CVA->getOperand(i))->getValue() < 0)
- return false;
-
- return true;
-}
-
-/// toOctal - Convert the low order bits of X into an octal digit.
-///
-static inline char toOctal(int X) {
- return (X&7)+'0';
-}
-
-/// getAsCString - Return the specified array as a C compatible
-/// string, only if the predicate isStringCompatible is true.
-///
-static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
- assert(isStringCompatible(CVA) && "Array is not string compatible!");
-
- O << "\"";
- for (unsigned i = 0; i < CVA->getNumOperands(); ++i) {
- unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
-
- if (C == '"') {
- O << "\\\"";
- } else if (C == '\\') {
- O << "\\\\";
- } else if (isprint(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;
- }
- }
- }
- O << "\"";
-}
-
-// Print out the specified constant, without a storage class. Only the
-// constants valid in constant expressions can occur here.
-void Printer::emitConstantValueOnly(const Constant *CV) {
- if (CV->isNullValue())
- O << "0";
- else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
- assert(CB == ConstantBool::True);
- O << "1";
- } else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
- O << CI->getValue();
- else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
- O << CI->getValue();
- else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CV))
- // This is a constant address for a global variable or function. Use the
- // name of the variable or function as the address value.
- O << Mang->getValueName(CPR->getValue());
- else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
- const TargetData &TD = TM.getTargetData();
- switch(CE->getOpcode()) {
- case Instruction::GetElementPtr: {
- // generate a symbolic expression for the byte address
- const Constant *ptrVal = CE->getOperand(0);
- std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
- if (unsigned Offset = TD.getIndexedOffset(ptrVal->getType(), idxVec)) {
- O << "(";
- emitConstantValueOnly(ptrVal);
- O << ") + " << Offset;
- } else {
- emitConstantValueOnly(ptrVal);
- }
- break;
- }
- case Instruction::Cast: {
- // Support only non-converting or widening casts for now, that is, ones
- // that do not involve a change in value. This assertion is really gross,
- // and may not even be a complete check.
- Constant *Op = CE->getOperand(0);
- const Type *OpTy = Op->getType(), *Ty = CE->getType();
-
- // Remember, kids, pointers on x86 can be losslessly converted back and
- // forth into 32-bit or wider integers, regardless of signedness. :-P
- assert(((isa<PointerType>(OpTy)
- && (Ty == Type::LongTy || Ty == Type::ULongTy
- || Ty == Type::IntTy || Ty == Type::UIntTy))
- || (isa<PointerType>(Ty)
- && (OpTy == Type::LongTy || OpTy == Type::ULongTy
- || OpTy == Type::IntTy || OpTy == Type::UIntTy))
- || (((TD.getTypeSize(Ty) >= TD.getTypeSize(OpTy))
- && OpTy->isLosslesslyConvertibleTo(Ty))))
- && "FIXME: Don't yet support this kind of constant cast expr");
- O << "(";
- emitConstantValueOnly(Op);
- O << ")";
- break;
- }
- case Instruction::Add:
- O << "(";
- emitConstantValueOnly(CE->getOperand(0));
- O << ") + (";
- emitConstantValueOnly(CE->getOperand(1));
- O << ")";
- break;
- default:
- assert(0 && "Unsupported operator!");
- }
- } else {
- assert(0 && "Unknown constant value!");
- }
-}
-
-// Print a constant value or values, with the appropriate storage class as a
-// prefix.
-void Printer::emitGlobalConstant(const Constant *CV) {
- const TargetData &TD = TM.getTargetData();
-
- if (CV->isNullValue()) {
- O << "\t.zero\t " << TD.getTypeSize(CV->getType()) << "\n";
- return;
- } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
- if (isStringCompatible(CVA)) {
- O << "\t.ascii\t";
- printAsCString(O, CVA);
- O << "\n";
- } else { // Not a string. Print the values in successive locations
- const std::vector<Use> &constValues = CVA->getValues();
- for (unsigned i=0; i < constValues.size(); i++)
- emitGlobalConstant(cast<Constant>(constValues[i].get()));
- }
- return;
- } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
- // Print the fields in successive locations. Pad to align if needed!
- const StructLayout *cvsLayout = TD.getStructLayout(CVS->getType());
- const std::vector<Use>& constValues = CVS->getValues();
- unsigned sizeSoFar = 0;
- for (unsigned i=0, N = constValues.size(); i < N; i++) {
- const Constant* field = cast<Constant>(constValues[i].get());
-
- // Check if padding is needed and insert one or more 0s.
- unsigned fieldSize = TD.getTypeSize(field->getType());
- unsigned padSize = ((i == N-1? cvsLayout->StructSize
- : cvsLayout->MemberOffsets[i+1])
- - cvsLayout->MemberOffsets[i]) - fieldSize;
- sizeSoFar += fieldSize + padSize;
-
- // Now print the actual field value
- emitGlobalConstant(field);
-
- // Insert the field padding unless it's zero bytes...
- if (padSize)
- O << "\t.zero\t " << padSize << "\n";
- }
- assert(sizeSoFar == cvsLayout->StructSize &&
- "Layout of constant struct may be incorrect!");
- return;
- } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
- // FP Constants are printed as integer constants to avoid losing
- // precision...
- double Val = CFP->getValue();
- switch (CFP->getType()->getPrimitiveID()) {
- default: assert(0 && "Unknown floating point type!");
- case Type::FloatTyID: {
- union FU { // Abide by C TBAA rules
- float FVal;
- unsigned UVal;
- } U;
- U.FVal = Val;
- O << ".long\t" << U.UVal << "\t# float " << Val << "\n";
- return;
- }
- case Type::DoubleTyID: {
- union DU { // Abide by C TBAA rules
- double FVal;
- uint64_t UVal;
- } U;
- U.FVal = Val;
- O << ".quad\t" << U.UVal << "\t# double " << Val << "\n";
- return;
- }
- }
- }
-
- const Type *type = CV->getType();
- O << "\t";
- switch (type->getPrimitiveID()) {
- case Type::BoolTyID: case Type::UByteTyID: case Type::SByteTyID:
- O << ".byte";
+#include "llvm/Support/CommandLine.h"
+using namespace llvm;
+using namespace x86;
+
+Statistic<> llvm::x86::EmittedInsts("asm-printer",
+ "Number of machine instrs printed");
+
+enum AsmWriterFlavorTy { att, intel };
+cl::opt<AsmWriterFlavorTy>
+AsmWriterFlavor("x86-asm-syntax",
+ cl::desc("Choose style of code to emit from X86 backend:"),
+ cl::values(
+ clEnumVal(att, " Emit AT&T-style assembly"),
+ clEnumVal(intel, " Emit Intel-style assembly"),
+ clEnumValEnd),
+ cl::init(att));
+
+/// doInitialization
+bool X86SharedAsmPrinter::doInitialization(Module &M) {
+ const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
+
+ forDarwin = false;
+
+ switch (Subtarget->TargetType) {
+ case X86Subtarget::isDarwin:
+ AlignmentIsInBytes = false;
+ GlobalPrefix = "_";
+ Data64bitsDirective = 0; // we can't emit a 64-bit unit
+ ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
+ PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
+ ConstantPoolSection = "\t.const\n";
+ LCOMMDirective = "\t.lcomm\t";
+ COMMDirectiveTakesAlignment = false;
+ HasDotTypeDotSizeDirective = false;
+ forDarwin = true;
break;
- case Type::UShortTyID: case Type::ShortTyID:
- O << ".word";
+ case X86Subtarget::isCygwin:
+ GlobalPrefix = "_";
+ COMMDirectiveTakesAlignment = false;
+ HasDotTypeDotSizeDirective = false;
break;
- case Type::FloatTyID: case Type::PointerTyID:
- case Type::UIntTyID: case Type::IntTyID:
- O << ".long";
- break;
- case Type::DoubleTyID:
- case Type::ULongTyID: case Type::LongTyID:
- O << ".quad";
- break;
- default:
- assert (0 && "Can't handle printing this type of thing");
+ case X86Subtarget::isWindows:
+ GlobalPrefix = "_";
+ HasDotTypeDotSizeDirective = false;
break;
+ default: break;
}
- O << "\t";
- emitConstantValueOnly(CV);
- O << "\n";
+
+ return AsmPrinter::doInitialization(M);
}
-/// printConstantPool - 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 Printer::printConstantPool(MachineConstantPool *MCP) {
- const std::vector<Constant*> &CP = MCP->getConstants();
- const TargetData &TD = TM.getTargetData();
-
- if (CP.empty()) return;
-
- for (unsigned i = 0, e = CP.size(); i != e; ++i) {
- O << "\t.section .rodata\n";
- O << "\t.align " << (unsigned)TD.getTypeAlignment(CP[i]->getType())
- << "\n";
- O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t#"
- << *CP[i] << "\n";
- emitGlobalConstant(CP[i]);
- }
-}
-
-/// runOnMachineFunction - This uses the printMachineInstruction()
-/// method to print assembly for each instruction.
-///
-bool Printer::runOnMachineFunction(MachineFunction &MF) {
- // BBNumber is used here so that a given Printer will never give two
- // BBs the same name. (If you have a better way, please let me know!)
- static unsigned BBNumber = 0;
-
- O << "\n\n";
- // What's my mangled name?
- CurrentFnName = Mang->getValueName(MF.getFunction());
-
- // Print out constants referenced by the function
- printConstantPool(MF.getConstantPool());
-
- // Print out labels for the function.
- O << "\t.text\n";
- O << "\t.align 16\n";
- O << "\t.globl\t" << CurrentFnName << "\n";
- if (!EmitCygwin)
- O << "\t.type\t" << CurrentFnName << ", @function\n";
- O << CurrentFnName << ":\n";
-
- // Number each basic block so that we can consistently refer to them
- // in PC-relative references.
- NumberForBB.clear();
- for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
- I != E; ++I) {
- NumberForBB[I->getBasicBlock()] = BBNumber++;
- }
-
- // 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.
- O << ".LBB" << NumberForBB[I->getBasicBlock()] << ":\t# "
- << I->getBasicBlock()->getName() << "\n";
- for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
- II != E; ++II) {
- // Print the assembly for the instruction.
- O << "\t";
- printMachineInstruction(*II);
+/// EmitXXStructorList - Emit the ctor or dtor list. On darwin, this just
+/// prints out the function pointers.
+void X86SharedAsmPrinter::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.
+ // Emit the function pointer.
+ EmitGlobalConstant(CS->getOperand(1));
}
- }
-
- // We didn't modify anything.
- return false;
-}
-
-static bool isScale(const MachineOperand &MO) {
- return MO.isImmediate() &&
- (MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
- MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
-}
-
-static bool isMem(const MachineInstr *MI, unsigned Op) {
- if (MI->getOperand(Op).isFrameIndex()) return true;
- if (MI->getOperand(Op).isConstantPoolIndex()) return true;
- return Op+4 <= MI->getNumOperands() &&
- MI->getOperand(Op ).isRegister() &&isScale(MI->getOperand(Op+1)) &&
- MI->getOperand(Op+2).isRegister() &&MI->getOperand(Op+3).isImmediate();
}
+bool X86SharedAsmPrinter::doFinalization(Module &M) {
+ const TargetData &TD = TM.getTargetData();
-
-void Printer::printOp(const MachineOperand &MO,
- bool elideOffsetKeyword /* = false */) {
- const MRegisterInfo &RI = *TM.getRegisterInfo();
- switch (MO.getType()) {
- case MachineOperand::MO_VirtualRegister:
- if (Value *V = MO.getVRegValueOrNull()) {
- O << "<" << V->getName() << ">";
- return;
- }
- // FALLTHROUGH
- case MachineOperand::MO_MachineRegister:
- if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
- // Bug Workaround: See note in Printer::doInitialization about %.
- O << "%" << RI.get(MO.getReg()).Name;
- else
- O << "%reg" << MO.getReg();
- return;
-
- case MachineOperand::MO_SignExtendedImmed:
- case MachineOperand::MO_UnextendedImmed:
- O << (int)MO.getImmedValue();
- return;
- case MachineOperand::MO_PCRelativeDisp: {
- ValueMapTy::const_iterator i = NumberForBB.find(MO.getVRegValue());
- assert (i != NumberForBB.end()
- && "Could not find a BB in the NumberForBB map!");
- O << ".LBB" << i->second << " # PC rel: " << MO.getVRegValue()->getName();
- return;
- }
- case MachineOperand::MO_GlobalAddress:
- if (!elideOffsetKeyword)
- O << "OFFSET ";
- O << Mang->getValueName(MO.getGlobal());
- return;
- case MachineOperand::MO_ExternalSymbol:
- O << MO.getSymbolName();
- return;
- default:
- O << "<unknown operand type>"; return;
- }
-}
-
-static const std::string sizePtr(const TargetInstrDescriptor &Desc) {
- switch (Desc.TSFlags & X86II::ArgMask) {
- default: assert(0 && "Unknown arg size!");
- case X86II::Arg8: return "BYTE PTR";
- case X86II::Arg16: return "WORD PTR";
- case X86II::Arg32: return "DWORD PTR";
- case X86II::Arg64: return "QWORD PTR";
- case X86II::ArgF32: return "DWORD PTR";
- case X86II::ArgF64: return "QWORD PTR";
- case X86II::ArgF80: return "XWORD PTR";
- }
-}
-
-void Printer::printMemReference(const MachineInstr *MI, unsigned Op) {
- assert(isMem(MI, Op) && "Invalid memory reference!");
-
- if (MI->getOperand(Op).isFrameIndex()) {
- O << "[frame slot #" << MI->getOperand(Op).getFrameIndex();
- if (MI->getOperand(Op+3).getImmedValue())
- O << " + " << MI->getOperand(Op+3).getImmedValue();
- O << "]";
- return;
- } else if (MI->getOperand(Op).isConstantPoolIndex()) {
- O << "[.CPI" << CurrentFnName << "_"
- << MI->getOperand(Op).getConstantPoolIndex();
- if (MI->getOperand(Op+3).getImmedValue())
- O << " + " << MI->getOperand(Op+3).getImmedValue();
- O << "]";
- return;
- }
-
- const MachineOperand &BaseReg = MI->getOperand(Op);
- int ScaleVal = MI->getOperand(Op+1).getImmedValue();
- const MachineOperand &IndexReg = MI->getOperand(Op+2);
- int DispVal = MI->getOperand(Op+3).getImmedValue();
-
- O << "[";
- bool NeedPlus = false;
- if (BaseReg.getReg()) {
- printOp(BaseReg);
- NeedPlus = true;
- }
-
- if (IndexReg.getReg()) {
- if (NeedPlus) O << " + ";
- if (ScaleVal != 1)
- O << ScaleVal << "*";
- printOp(IndexReg);
- NeedPlus = true;
- }
-
- if (DispVal) {
- if (NeedPlus)
- if (DispVal > 0)
- O << " + ";
- else {
- O << " - ";
- DispVal = -DispVal;
- }
- O << DispVal;
- }
- O << "]";
-}
-
-/// checkImplUses - Emit the implicit-use registers for the
-/// instruction described by DESC, if its PrintImplUses flag is set.
-///
-void Printer::checkImplUses (const TargetInstrDescriptor &Desc) {
- const MRegisterInfo &RI = *TM.getRegisterInfo();
- if (Desc.TSFlags & X86II::PrintImplUses) {
- for (const unsigned *p = Desc.ImplicitUses; *p; ++p) {
- // Bug Workaround: See note in Printer::doInitialization about %.
- O << ", %" << RI.get(*p).Name;
- }
- }
-}
-
-/// printMachineInstruction -- Print out a single X86 LLVM instruction
-/// MI in Intel syntax to the current output stream.
-///
-void Printer::printMachineInstruction(const MachineInstr *MI) {
- unsigned Opcode = MI->getOpcode();
- const TargetInstrInfo &TII = TM.getInstrInfo();
- const TargetInstrDescriptor &Desc = TII.get(Opcode);
-
- ++EmittedInsts;
- switch (Desc.TSFlags & X86II::FormMask) {
- case X86II::Pseudo:
- // Print pseudo-instructions as comments; either they should have been
- // turned into real instructions by now, or they don't need to be
- // seen by the assembler (e.g., IMPLICIT_USEs.)
- O << "# ";
- if (Opcode == X86::PHI) {
- printOp(MI->getOperand(0));
- O << " = phi ";
- for (unsigned i = 1, e = MI->getNumOperands(); i != e; i+=2) {
- if (i != 1) O << ", ";
- O << "[";
- printOp(MI->getOperand(i));
- O << ", ";
- printOp(MI->getOperand(i+1));
- O << "]";
- }
- } else {
- unsigned i = 0;
- if (MI->getNumOperands() && (MI->getOperand(0).opIsDefOnly() ||
- MI->getOperand(0).opIsDefAndUse())) {
- printOp(MI->getOperand(0));
- O << " = ";
- ++i;
- }
- O << TII.getName(MI->getOpcode());
-
- for (unsigned e = MI->getNumOperands(); i != e; ++i) {
- O << " ";
- if (MI->getOperand(i).opIsDefOnly() ||
- MI->getOperand(i).opIsDefAndUse()) O << "*";
- printOp(MI->getOperand(i));
- if (MI->getOperand(i).opIsDefOnly() ||
- MI->getOperand(i).opIsDefAndUse()) O << "*";
+ // 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 (I->hasAppendingLinkage()) {
+ if (I->getName() == "llvm.used")
+ continue; // No need to emit this at all.
+ if (I->getName() == "llvm.global_ctors") {
+ if (forDarwin)
+ SwitchSection(".mod_init_func", 0);
+ else
+ SwitchSection(".ctors,\"aw\",@progbits", 0);
+ EmitAlignment(2, 0);
+ EmitXXStructorList(I->getInitializer());
+ continue;
+ } else if (I->getName() == "llvm.global_dtors") {
+ if (forDarwin)
+ SwitchSection(".mod_term_func", 0);
+ else
+ SwitchSection(".dtors,\"aw\",@progbits", 0);
+ EmitAlignment(2, 0);
+ EmitXXStructorList(I->getInitializer());
+ continue;
}
}
- O << "\n";
- return;
-
- case X86II::RawFrm:
- // The accepted forms of Raw instructions are:
- // 1. nop - No operand required
- // 2. jmp foo - PC relative displacement operand
- // 3. call bar - GlobalAddress Operand or External Symbol Operand
- //
- assert(MI->getNumOperands() == 0 ||
- (MI->getNumOperands() == 1 &&
- (MI->getOperand(0).isPCRelativeDisp() ||
- MI->getOperand(0).isGlobalAddress() ||
- MI->getOperand(0).isExternalSymbol())) &&
- "Illegal raw instruction!");
- O << TII.getName(MI->getOpcode()) << " ";
-
- if (MI->getNumOperands() == 1) {
- printOp(MI->getOperand(0), true); // Don't print "OFFSET"...
- }
- O << "\n";
- return;
-
- case X86II::AddRegFrm: {
- // There are currently two forms of acceptable AddRegFrm instructions.
- // Either the instruction JUST takes a single register (like inc, dec, etc),
- // or it takes a register and an immediate of the same size as the register
- // (move immediate f.e.). Note that this immediate value might be stored as
- // an LLVM value, to represent, for example, loading the address of a global
- // into a register. The initial register might be duplicated if this is a
- // M_2_ADDR_REG instruction
- //
- assert(MI->getOperand(0).isRegister() &&
- (MI->getNumOperands() == 1 ||
- (MI->getNumOperands() == 2 &&
- (MI->getOperand(1).getVRegValueOrNull() ||
- MI->getOperand(1).isImmediate() ||
- MI->getOperand(1).isRegister() ||
- MI->getOperand(1).isGlobalAddress() ||
- MI->getOperand(1).isExternalSymbol()))) &&
- "Illegal form for AddRegFrm instruction!");
-
- unsigned Reg = MI->getOperand(0).getReg();
- O << TII.getName(MI->getOpCode()) << " ";
- printOp(MI->getOperand(0));
- if (MI->getNumOperands() == 2 &&
- (!MI->getOperand(1).isRegister() ||
- MI->getOperand(1).getVRegValueOrNull() ||
- MI->getOperand(1).isGlobalAddress() ||
- MI->getOperand(1).isExternalSymbol())) {
- O << ", ";
- printOp(MI->getOperand(1));
- }
- checkImplUses(Desc);
- O << "\n";
- return;
- }
- case X86II::MRMDestReg: {
- // There are two acceptable forms of MRMDestReg instructions, those with 2,
- // 3 and 4 operands:
- //
- // 2 Operands: this is for things like mov that do not read a second input
- //
- // 3 Operands: in this form, the first two registers (the destination, and
- // the first operand) should be the same, post register allocation. The 3rd
- // operand is an additional input. This should be for things like add
- // instructions.
- //
- // 4 Operands: This form is for instructions which are 3 operands forms, but
- // have a constant argument as well.
- //
- bool isTwoAddr = TII.isTwoAddrInstr(Opcode);
- assert(MI->getOperand(0).isRegister() &&
- (MI->getNumOperands() == 2 ||
- (isTwoAddr && MI->getOperand(1).isRegister() &&
- MI->getOperand(0).getReg() == MI->getOperand(1).getReg() &&
- (MI->getNumOperands() == 3 ||
- (MI->getNumOperands() == 4 && MI->getOperand(3).isImmediate()))))
- && "Bad format for MRMDestReg!");
-
- O << TII.getName(MI->getOpCode()) << " ";
- printOp(MI->getOperand(0));
- O << ", ";
- printOp(MI->getOperand(1+isTwoAddr));
- if (MI->getNumOperands() == 4) {
- O << ", ";
- printOp(MI->getOperand(3));
- }
- O << "\n";
- return;
- }
-
- case X86II::MRMDestMem: {
- // These instructions are the same as MRMDestReg, but instead of having a
- // register reference for the mod/rm field, it's a memory reference.
- //
- assert(isMem(MI, 0) && MI->getNumOperands() == 4+1 &&
- MI->getOperand(4).isRegister() && "Bad format for MRMDestMem!");
-
- O << TII.getName(MI->getOpCode()) << " " << sizePtr(Desc) << " ";
- printMemReference(MI, 0);
- O << ", ";
- printOp(MI->getOperand(4));
- O << "\n";
- return;
- }
-
- case X86II::MRMSrcReg: {
- // There are three forms that are acceptable for MRMSrcReg instructions,
- // those with 3 and 2 operands:
- //
- // 3 Operands: in this form, the last register (the second input) is the
- // ModR/M input. The first two operands should be the same, post register
- // allocation. This is for things like: add r32, r/m32
- //
- // 3 Operands: in this form, we can have 'INST R, R, imm', which is used for
- // instructions like the IMULri instructions.
- //
- // 2 Operands: this is for things like mov that do not read a second input
- //
- assert(MI->getOperand(0).isRegister() &&
- MI->getOperand(1).isRegister() &&
- (MI->getNumOperands() == 2 ||
- (MI->getNumOperands() == 3 &&
- (MI->getOperand(2).isRegister() ||
- MI->getOperand(2).isImmediate())))
- && "Bad format for MRMSrcReg!");
- if (MI->getNumOperands() == 3 &&
- MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
- O << "**";
-
- O << TII.getName(MI->getOpCode()) << " ";
- printOp(MI->getOperand(0));
-
- // If this is IMULri* instructions, print the non-two-address operand.
- if (MI->getNumOperands() == 3 && MI->getOperand(2).isImmediate()) {
- O << ", ";
- printOp(MI->getOperand(1));
- }
-
- O << ", ";
- printOp(MI->getOperand(MI->getNumOperands()-1));
- O << "\n";
- return;
- }
-
- case X86II::MRMSrcMem: {
- // These instructions are the same as MRMSrcReg, but instead of having a
- // register reference for the mod/rm field, it's a memory reference.
- //
- assert(MI->getOperand(0).isRegister() &&
- (MI->getNumOperands() == 1+4 && isMem(MI, 1)) ||
- (MI->getNumOperands() == 2+4 && MI->getOperand(1).isRegister() &&
- isMem(MI, 2))
- && "Bad format for MRMDestReg!");
- if (MI->getNumOperands() == 2+4 &&
- MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
- O << "**";
-
- O << TII.getName(MI->getOpCode()) << " ";
- printOp(MI->getOperand(0));
- O << ", " << sizePtr(Desc) << " ";
- printMemReference(MI, MI->getNumOperands()-4);
- O << "\n";
- return;
- }
-
- case X86II::MRMS0r: case X86II::MRMS1r:
- case X86II::MRMS2r: case X86II::MRMS3r:
- case X86II::MRMS4r: case X86II::MRMS5r:
- case X86II::MRMS6r: case X86II::MRMS7r: {
- // In this form, the following are valid formats:
- // 1. sete r
- // 2. cmp reg, immediate
- // 2. shl rdest, rinput <implicit CL or 1>
- // 3. sbb rdest, rinput, immediate [rdest = rinput]
- //
- assert(MI->getNumOperands() > 0 && MI->getNumOperands() < 4 &&
- MI->getOperand(0).isRegister() && "Bad MRMSxR format!");
- assert((MI->getNumOperands() != 2 ||
- MI->getOperand(1).isRegister() || MI->getOperand(1).isImmediate())&&
- "Bad MRMSxR format!");
- assert((MI->getNumOperands() < 3 ||
- (MI->getOperand(1).isRegister() && MI->getOperand(2).isImmediate())) &&
- "Bad MRMSxR format!");
-
- if (MI->getNumOperands() > 1 && MI->getOperand(1).isRegister() &&
- MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
- O << "**";
-
- O << TII.getName(MI->getOpCode()) << " ";
- printOp(MI->getOperand(0));
- if (MI->getOperand(MI->getNumOperands()-1).isImmediate()) {
- O << ", ";
- printOp(MI->getOperand(MI->getNumOperands()-1));
- }
- checkImplUses(Desc);
- O << "\n";
-
- return;
- }
-
- case X86II::MRMS0m: case X86II::MRMS1m:
- case X86II::MRMS2m: case X86II::MRMS3m:
- case X86II::MRMS4m: case X86II::MRMS5m:
- case X86II::MRMS6m: case X86II::MRMS7m: {
- // In this form, the following are valid formats:
- // 1. sete [m]
- // 2. cmp [m], immediate
- // 2. shl [m], rinput <implicit CL or 1>
- // 3. sbb [m], immediate
- //
- assert(MI->getNumOperands() >= 4 && MI->getNumOperands() <= 5 &&
- isMem(MI, 0) && "Bad MRMSxM format!");
- assert((MI->getNumOperands() != 5 ||
- (MI->getOperand(4).isImmediate() ||
- MI->getOperand(4).isGlobalAddress())) &&
- "Bad MRMSxM format!");
-
- const MachineOperand &Op3 = MI->getOperand(3);
-
- // Bug: The 80-bit FP store-pop instruction "fstp XWORD PTR [...]"
- // is misassembled by gas in intel_syntax mode as its 32-bit
- // equivalent "fstp DWORD PTR [...]". Workaround: Output the raw
- // opcode bytes instead of the instruction.
- if (MI->getOpCode() == X86::FSTPr80) {
- if ((MI->getOperand(0).getReg() == X86::ESP)
- && (MI->getOperand(1).getImmedValue() == 1)) {
- if (Op3.isImmediate() &&
- Op3.getImmedValue() >= -128 && Op3.getImmedValue() <= 127) {
- // 1 byte disp.
- O << ".byte 0xdb, 0x7c, 0x24, 0x" << std::hex
- << ((unsigned)Op3.getImmedValue() & 255) << std::dec << "\t# ";
- } else {
- O << ".byte 0xdb, 0xbc, 0x24\n\t";
- O << ".long ";
- printOp(Op3);
- O << "\t# ";
- }
+ O << "\n\n";
+ std::string name = Mang->getValueName(I);
+ Constant *C = I->getInitializer();
+ unsigned Size = TD.getTypeSize(C->getType());
+ unsigned Align = TD.getTypeAlignmentShift(C->getType());
+
+ switch (I->getLinkage()) {
+ default: assert(0 && "Unknown linkage type!");
+ case GlobalValue::LinkOnceLinkage:
+ case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
+ if (C->isNullValue()) {
+ O << COMMDirective << name << "," << Size;
+ if (COMMDirectiveTakesAlignment)
+ O << "," << (1 << Align);
+ O << "\t\t" << CommentString << " " << I->getName() << "\n";
+ continue;
}
- }
-
- // Bug: The 80-bit FP load instruction "fld XWORD PTR [...]" is
- // misassembled by gas in intel_syntax mode as its 32-bit
- // equivalent "fld DWORD PTR [...]". Workaround: Output the raw
- // opcode bytes instead of the instruction.
- if (MI->getOpCode() == X86::FLDr80 &&
- MI->getOperand(0).getReg() == X86::ESP &&
- MI->getOperand(1).getImmedValue() == 1) {
- if (Op3.isImmediate() && Op3.getImmedValue() >= -128 &&
- Op3.getImmedValue() <= 127) { // 1 byte displacement
- O << ".byte 0xdb, 0x6c, 0x24, 0x" << std::hex
- << ((unsigned)Op3.getImmedValue() & 255) << std::dec << "\t# ";
- } else {
- O << ".byte 0xdb, 0xac, 0x24\n\t";
- O << ".long ";
- printOp(Op3);
- O << "\t# ";
+
+ // Nonnull linkonce -> weak
+ O << "\t.weak " << name << "\n";
+ O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
+ SwitchSection("", I);
+ break;
+ case GlobalValue::InternalLinkage:
+ if (C->isNullValue()) {
+ if (LCOMMDirective) {
+ O << LCOMMDirective << name << "," << Size << "," << Align;
+ continue;
+ } else {
+ SwitchSection(".bss", I);
+ O << "\t.local " << name << "\n";
+ O << COMMDirective << name << "," << Size;
+ if (COMMDirectiveTakesAlignment)
+ O << "," << (1 << Align);
+ O << "\t\t# ";
+ WriteAsOperand(O, I, true, true, &M);
+ O << "\n";
+ continue;
+ }
}
+ SwitchSection(".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:
+ SwitchSection(C->isNullValue() ? ".bss" : ".data", I);
+ // If external or appending, declare as a global symbol
+ O << "\t.globl " << name << "\n";
+ break;
}
- // Bug: gas intel_syntax mode treats "fild QWORD PTR [...]" as an
- // invalid opcode, saying "64 bit operations are only supported in
- // 64 bit modes." libopcodes disassembles it as "fild DWORD PTR
- // [...]", which is wrong. Workaround: Output the raw opcode bytes
- // instead of the instruction.
- if (MI->getOpCode() == X86::FILDr64 &&
- MI->getOperand(0).getReg() == X86::ESP &&
- MI->getOperand(1).getImmedValue() == 1) {
- if (Op3.isImmediate() && Op3.getImmedValue() >= -128 &&
- Op3.getImmedValue() <= 127) { // 1 byte displacement
- O << ".byte 0xdf, 0x6c, 0x24, 0x" << std::hex
- << ((unsigned)Op3.getImmedValue() & 255) << std::dec << "\t# ";
- } else {
- O << ".byte 0xdf, 0xac, 0x24\n\t";
- O << ".long ";
- printOp(Op3);
- O << std::dec << "\t# ";
- }
+ EmitAlignment(Align);
+ if (HasDotTypeDotSizeDirective) {
+ O << "\t.type " << name << ",@object\n";
+ O << "\t.size " << name << "," << Size << "\n";
+ }
+ O << name << ":\t\t\t" << CommentString << ' ' << I->getName() << '\n';
+ EmitGlobalConstant(C);
+ }
+
+ if (forDarwin) {
+ SwitchSection("", 0);
+ // Output stubs for external global variables
+ if (GVStubs.begin() != GVStubs.end())
+ O << "\t.non_lazy_symbol_pointer\n";
+ for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
+ i != e; ++i) {
+ O << "L" << *i << "$non_lazy_ptr:\n";
+ O << "\t.indirect_symbol " << *i << "\n";
+ O << "\t.long\t0\n";
+ }
+
+ // Output stubs for dynamically-linked functions
+ unsigned j = 1;
+ for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
+ i != e; ++i, ++j) {
+ O << "\t.symbol_stub\n";
+ O << "L" << *i << "$stub:\n";
+ O << "\t.indirect_symbol " << *i << "\n";
+ O << "\tjmp\t*L" << j << "$lz\n";
+ O << "L" << *i << "$stub_binder:\n";
+ O << "\tpushl\t$L" << j << "$lz\n";
+ O << "\tjmp\tdyld_stub_binding_helper\n";
+ O << "\t.section __DATA, __la_sym_ptr3,lazy_symbol_pointers\n";
+ O << "L" << j << "$lz:\n";
+ O << "\t.indirect_symbol " << *i << "\n";
+ O << "\t.long\tL" << *i << "$stub_binder\n";
}
- // Bug: gas intel_syntax mode treats "fistp QWORD PTR [...]" as
- // an invalid opcode, saying "64 bit operations are only
- // supported in 64 bit modes." libopcodes disassembles it as
- // "fistpll DWORD PTR [...]", which is wrong. Workaround: Output
- // "fistpll DWORD PTR " instead, which is what libopcodes is
- // expecting to see.
- if (MI->getOpCode() == X86::FISTPr64) {
- O << "fistpll DWORD PTR ";
- printMemReference(MI, 0);
- if (MI->getNumOperands() == 5) {
- O << ", ";
- printOp(MI->getOperand(4));
- }
- O << "\t# ";
- }
-
- O << TII.getName(MI->getOpCode()) << " ";
- O << sizePtr(Desc) << " ";
- printMemReference(MI, 0);
- if (MI->getNumOperands() == 5) {
- O << ", ";
- printOp(MI->getOperand(4));
- }
O << "\n";
- return;
- }
- default:
- O << "\tUNKNOWN FORM:\t\t-"; MI->print(O, TM); break;
+ // Output stubs for link-once variables
+ if (LinkOnceStubs.begin() != LinkOnceStubs.end())
+ O << ".data\n.align 2\n";
+ for (std::set<std::string>::iterator i = LinkOnceStubs.begin(),
+ e = LinkOnceStubs.end(); i != e; ++i) {
+ O << "L" << *i << "$non_lazy_ptr:\n"
+ << "\t.long\t" << *i << '\n';
+ }
}
-}
-bool Printer::doInitialization(Module &M) {
- // Tell gas we are outputting Intel syntax (not AT&T syntax) assembly.
- //
- // Bug: gas in `intel_syntax noprefix' mode interprets the symbol `Sp' in an
- // instruction as a reference to the register named sp, and if you try to
- // reference a symbol `Sp' (e.g. `mov ECX, OFFSET Sp') then it gets lowercased
- // before being looked up in the symbol table. This creates spurious
- // `undefined symbol' errors when linking. Workaround: Do not use `noprefix'
- // mode, and decorate all register names with percent signs.
- O << "\t.intel_syntax\n";
- Mang = new Mangler(M, EmitCygwin);
+ AsmPrinter::doFinalization(M);
return false; // success
}
-// SwitchSection - Switch to the specified section of the executable if we are
-// not already in it!
-//
-static void SwitchSection(std::ostream &OS, std::string &CurSection,
- const char *NewSection) {
- if (CurSection != NewSection) {
- CurSection = NewSection;
- if (!CurSection.empty())
- OS << "\t" << NewSection << "\n";
+/// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
+/// for a MachineFunction to the given output stream, using the given target
+/// machine description.
+///
+FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
+ switch (AsmWriterFlavor) {
+ default:
+ assert(0 && "Unknown asm flavor!");
+ case intel:
+ return new X86IntelAsmPrinter(o, tm);
+ case att:
+ return new X86ATTAsmPrinter(o, tm);
}
}
-
-bool Printer::doFinalization(Module &M) {
- const TargetData &TD = TM.getTargetData();
- std::string CurSection;
-
- // Print out module-level global variables here.
- for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
- if (I->hasInitializer()) { // External global require no code
- O << "\n\n";
- std::string name = Mang->getValueName(I);
- Constant *C = I->getInitializer();
- unsigned Size = TD.getTypeSize(C->getType());
- unsigned Align = TD.getTypeAlignment(C->getType());
-
- if (C->isNullValue() &&
- (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
- I->hasWeakLinkage() /* FIXME: Verify correct */)) {
- SwitchSection(O, CurSection, ".data");
- if (I->hasInternalLinkage())
- O << "\t.local " << name << "\n";
-
- O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
- << "," << (unsigned)TD.getTypeAlignment(C->getType());
- O << "\t\t# ";
- WriteAsOperand(O, I, true, true, &M);
- O << "\n";
- } else {
- switch (I->getLinkage()) {
- case GlobalValue::LinkOnceLinkage:
- case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
- // Nonnull linkonce -> weak
- O << "\t.weak " << name << "\n";
- SwitchSection(O, CurSection, "");
- O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
- 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 (C->isNullValue())
- SwitchSection(O, CurSection, ".bss");
- else
- SwitchSection(O, CurSection, ".data");
- break;
- }
-
- O << "\t.align " << Align << "\n";
- O << "\t.type " << name << ",@object\n";
- O << "\t.size " << name << "," << Size << "\n";
- O << name << ":\t\t\t\t# ";
- WriteAsOperand(O, I, true, true, &M);
- O << " = ";
- WriteAsOperand(O, C, false, false, &M);
- O << "\n";
- emitGlobalConstant(C);
- }
- }
-
- delete Mang;
- return false; // success
-}
-
-} // End llvm namespace
projects / oota-llvm.git / blobdiff