-//===-- X86/Printer.cpp - Convert X86 code to human readable rep. ---------===//
+//===-- X86/Printer.cpp - Convert X86 LLVM code to Intel 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 LLVM code to a nice human readable form that is suitable for debuggging.
+// 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.
//
//===----------------------------------------------------------------------===//
#include "X86.h"
#include "X86InstrInfo.h"
-#include "llvm/Function.h"
-#include "llvm/Constant.h"
-#include "llvm/Target/TargetMachine.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.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/hash_map"
-#include "llvm/Type.h"
-#include "llvm/Constants.h"
-#include "llvm/Assembly/Writer.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/SlotCalculator.h"
#include "Support/StringExtras.h"
-#include "llvm/Module.h"
+#include "Support/CommandLine.h"
+using 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;
- unsigned ConstIdx;
- Printer(std::ostream &o) : O(o), ConstIdx(0) {}
- const TargetData *TD;
+
+ /// 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);
- std::string ConstantExprToString(const ConstantExpr* CE);
- std::string valToExprString(const Value* V);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
- void PrintZeroBytesToPad(int numBytes);
- void printConstantValueOnly(const Constant* CV, int numPadBytesAfter = 0);
- void printSingleConstantValue(const Constant* CV);
+ void emitGlobalConstant(const Constant* CV);
+ void emitConstantValueOnly(const Constant *CV);
};
- std::map<const Value *, unsigned> NumberForBB;
-}
+} // end of anonymous namespace
-/// createX86CodePrinterPass - Print out the specified machine code function to
-/// the specified stream. This function should work regardless of whether or
-/// not the function is in SSA form or not.
+/// 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.
///
-Pass *createX86CodePrinterPass(std::ostream &O) {
- return new Printer(O);
-}
-
-// valToExprString - Helper function for ConstantExprToString().
-// Appends result to argument string S.
-//
-std::string Printer::valToExprString(const Value* V) {
- std::string S;
- bool failed = false;
- if (const Constant* CV = dyn_cast<Constant>(V)) { // symbolic or known
- if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV))
- S += std::string(CB == ConstantBool::True ? "1" : "0");
- else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
- S += itostr(CI->getValue());
- else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
- S += utostr(CI->getValue());
- else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
- S += ftostr(CFP->getValue());
- else if (isa<ConstantPointerNull>(CV))
- S += "0";
- else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CV))
- S += valToExprString(CPR->getValue());
- else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV))
- S += ConstantExprToString(CE);
- else
- failed = true;
- } else if (const GlobalValue* GV = dyn_cast<GlobalValue>(V)) {
- // S += getID(GV);
- assert (0 && "getID not implemented");
- }
- else
- failed = true;
-
- if (failed) {
- assert(0 && "Cannot convert value to string");
- S += "<illegal-value>";
- }
- return S;
-}
-
-// ConstantExprToString() - Convert a ConstantExpr to an asm expression
-// and return this as a string.
-std::string Printer::ConstantExprToString(const ConstantExpr* CE) {
- std::string S;
- switch(CE->getOpcode()) {
- case Instruction::GetElementPtr:
- { // generate a symbolic expression for the byte address
- const Value* ptrVal = CE->getOperand(0);
- std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
- S += "(" + valToExprString(ptrVal) + ") + ("
- + utostr(TD->getIndexedOffset(ptrVal->getType(),idxVec)) + ")";
- break;
- }
-
- case Instruction::Cast:
- // Support only non-converting casts for now, i.e., a no-op.
- // This assertion is not a complete check.
- assert(TD->getTypeSize(CE->getType()) ==
- TD->getTypeSize(CE->getOperand(0)->getType()));
- S += "(" + valToExprString(CE->getOperand(0)) + ")";
- break;
-
- case Instruction::Add:
- S += "(" + valToExprString(CE->getOperand(0)) + ") + ("
- + valToExprString(CE->getOperand(1)) + ")";
- break;
-
- default:
- assert(0 && "Unsupported operator in ConstantExprToString()");
- break;
- }
-
- return S;
+FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
+ return new Printer(o, tm);
}
-// Print a single constant value.
-void
-Printer::printSingleConstantValue(const Constant* CV)
-{
- assert(CV->getType() != Type::VoidTy &&
- CV->getType() != Type::TypeTy &&
- CV->getType() != Type::LabelTy &&
- "Unexpected type for Constant");
-
- assert((!isa<ConstantArray>(CV) && ! isa<ConstantStruct>(CV))
- && "Aggregate types should be handled outside this function");
-
- const Type *type = CV->getType();
- O << "\t";
- switch(type->getPrimitiveID())
- {
- case Type::BoolTyID: case Type::UByteTyID: case Type::SByteTyID:
- O << ".byte";
- break;
- case Type::UShortTyID: case Type::ShortTyID:
- O << ".word";
- break;
- case Type::UIntTyID: case Type::IntTyID: case Type::PointerTyID:
- O << ".long";
- break;
- case Type::ULongTyID: case Type::LongTyID:
- O << ".quad";
- break;
- case Type::FloatTyID:
- O << ".long";
- break;
- case Type::DoubleTyID:
- O << ".quad";
- break;
- case Type::ArrayTyID:
- if ((cast<ArrayType>(type)->getElementType() == Type::UByteTy) ||
- (cast<ArrayType>(type)->getElementType() == Type::SByteTy))
- O << ".string";
- else
- assert (0 && "Can't handle printing this type of array");
- break;
- default:
- assert (0 && "Can't handle printing this type of thing");
- break;
- }
- O << "\t";
-
- if (type->isPrimitiveType())
- {
- if (type->isFloatingPoint()) {
- // FP Constants are printed as integer constants to avoid losing
- // precision...
- double Val = cast<ConstantFP>(CV)->getValue();
- if (type == Type::FloatTy) {
- float FVal = (float)Val;
- char *ProxyPtr = (char*)&FVal; // Abide by C TBAA rules
- O << *(unsigned int*)ProxyPtr;
- } else if (type == Type::DoubleTy) {
- char *ProxyPtr = (char*)&Val; // Abide by C TBAA rules
- O << *(uint64_t*)ProxyPtr;
- } else {
- assert(0 && "Unknown floating point type!");
- }
-
- O << "\t# " << type->getDescription() << " value: " << Val << "\n";
- } else {
- WriteAsOperand(O, CV, false, false) << "\n";
- }
- }
- else if (const ConstantPointerRef* CPR = dyn_cast<ConstantPointerRef>(CV))
- {
- // This is a constant address for a global variable or method.
- // Use the name of the variable or method as the address value.
- // O << getID(CPR->getValue()) << "\n";
- assert (0 && "getID not implemented");
-
- }
- else if (isa<ConstantPointerNull>(CV))
- {
- // Null pointer value
- O << "0\n";
- }
- else if (const ConstantExpr* CE = dyn_cast<ConstantExpr>(CV))
- {
- // Constant expression built from operators, constants, and
- // symbolic addrs
- O << ConstantExprToString(CE) << "\n";
- }
- else
- {
- assert(0 && "Unknown elementary type for constant");
- }
-}
-
-// 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 letter
+/// 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 std::string getAsCString(const ConstantArray *CVA) {
- assert(isStringCompatible(CVA) && "Array is not string compatible!");
+/// 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(CVA->isString() && "Array is not string compatible!");
- std::string Result;
- const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType();
- Result = "\"";
- for (unsigned i = 0; i < CVA->getNumOperands(); ++i) {
- unsigned char C = (ETy == Type::SByteTy) ?
- (unsigned char)cast<ConstantSInt>(CVA->getOperand(i))->getValue() :
- (unsigned char)cast<ConstantUInt>(CVA->getOperand(i))->getValue();
+ O << "\"";
+ for (unsigned i = 0; i != CVA->getNumOperands(); ++i) {
+ unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
if (C == '"') {
- Result += "\\\"";
+ O << "\\\"";
} else if (C == '\\') {
- Result += "\\\\";
+ O << "\\\\";
} else if (isprint(C)) {
- Result += C;
+ O << C;
} else {
switch(C) {
- case '\a': Result += "\\a"; break;
- case '\b': Result += "\\b"; break;
- case '\f': Result += "\\f"; break;
- case '\n': Result += "\\n"; break;
- case '\r': Result += "\\r"; break;
- case '\t': Result += "\\t"; break;
- case '\v': Result += "\\v"; break;
+ 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:
- Result += '\\';
- Result += toOctal(C >> 6);
- Result += toOctal(C >> 3);
- Result += toOctal(C >> 0);
+ O << '\\';
+ O << toOctal(C >> 6);
+ O << toOctal(C >> 3);
+ O << toOctal(C >> 0);
break;
}
}
}
- Result += "\"";
- return Result;
+ O << "\"";
}
-// Print a constant value or values (it may be an aggregate).
-// Uses printSingleConstantValue() to print each individual value.
-void
-Printer::printConstantValueOnly(const Constant* CV,
- int numPadBytesAfter /* = 0 */)
-{
- const ConstantArray *CVA = dyn_cast<ConstantArray>(CV);
-
- if (CVA && isStringCompatible(CVA))
- { // print the string alone and return
- O << "\t" << ".string" << "\t" << getAsCString(CVA) << "\n";
+// 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;
}
- else if (CVA)
- { // Not a string. Print the values in successive locations
+ 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 (CVA->isString()) {
+ 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++)
- printConstantValueOnly(cast<Constant>(constValues[i].get()));
+ emitGlobalConstant(cast<Constant>(constValues[i].get()));
}
- 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());
- int padSize = ((i == N-1? cvsLayout->StructSize
- : cvsLayout->MemberOffsets[i+1])
- - cvsLayout->MemberOffsets[i]) - fieldSize;
- sizeSoFar += (fieldSize + padSize);
-
- // Now print the actual field value
- printConstantValueOnly(field, padSize);
- }
- assert(sizeSoFar == cvsLayout->StructSize &&
- "Layout of constant struct may be incorrect!");
+ 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";
}
- else
- printSingleConstantValue(CV);
-
- if (numPadBytesAfter) {
- unsigned numBytes = numPadBytesAfter;
- for ( ; numBytes >= 8; numBytes -= 8)
- printSingleConstantValue(Constant::getNullValue(Type::ULongTy));
- if (numBytes >= 4)
- {
- printSingleConstantValue(Constant::getNullValue(Type::UIntTy));
- numBytes -= 4;
- }
- while (numBytes--)
- printSingleConstantValue(Constant::getNullValue(Type::UByteTy));
+ 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";
+ break;
+ case Type::UShortTyID: case Type::ShortTyID:
+ O << ".word";
+ 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");
+ break;
}
+ O << "\t";
+ emitConstantValueOnly(CV);
+ O << "\n";
}
-// printConstantPool - Print out any constants which have been spilled to
-// memory...
-void Printer::printConstantPool(MachineConstantPool *MCP){
+/// 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" << i+ConstIdx << ":\t\t\t\t\t#" << *CP[i] << "\n";
- printConstantValueOnly (CP[i]);
+ 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]);
}
- ConstIdx += CP.size(); // Don't recycle constant pool index numbers
}
-/// runOnMachineFunction - This uses the X86InstructionInfo::print method
-/// to print assembly for each instruction.
+/// 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;
- const TargetMachine &TM = MF.getTarget();
- const TargetInstrInfo &TII = TM.getInstrInfo();
- TD = &TM.getTargetData();
+
+ 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" << MF.getFunction()->getName() << "\n";
- O << "\t.type\t" << MF.getFunction()->getName() << ", @function\n";
- O << MF.getFunction()->getName() << ":\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) {
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
// Print a label for the basic block.
- O << ".BB" << NumberForBB[I->getBasicBlock()] << ":\t# "
+ 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";
- TII.print(*II, O, TM);
+ printMachineInstruction(II);
}
}
MI->getOperand(Op+2).isRegister() &&MI->getOperand(Op+3).isImmediate();
}
-static void printOp(std::ostream &O, const MachineOperand &MO,
- const MRegisterInfo &RI, bool elideOffsetKeyword = false) {
+
+
+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()) {
}
// FALLTHROUGH
case MachineOperand::MO_MachineRegister:
- if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
- O << RI.get(MO.getReg()).Name;
+ if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
+ // Bug Workaround: See note in Printer::doInitialization about %.
+ O << "%" << RI.get(MO.getReg()).Name;
else
O << "%reg" << MO.getReg();
return;
case MachineOperand::MO_UnextendedImmed:
O << (int)MO.getImmedValue();
return;
- case MachineOperand::MO_PCRelativeDisp:
- O << ".BB" << NumberForBB[MO.getVRegValue()] << " # PC rel: "
- << MO.getVRegValue()->getName();
+ 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 << MO.getGlobal()->getName();
+ if (!elideOffsetKeyword)
+ O << "OFFSET ";
+ O << Mang->getValueName(MO.getGlobal());
return;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
}
}
-static void printMemReference(std::ostream &O, const MachineInstr *MI,
- unsigned Op, const MRegisterInfo &RI) {
+void Printer::printMemReference(const MachineInstr *MI, unsigned Op) {
assert(isMem(MI, Op) && "Invalid memory reference!");
if (MI->getOperand(Op).isFrameIndex()) {
O << "]";
return;
} else if (MI->getOperand(Op).isConstantPoolIndex()) {
- O << "[.CPI" << MI->getOperand(Op).getConstantPoolIndex();
+ O << "[.CPI" << CurrentFnName << "_"
+ << MI->getOperand(Op).getConstantPoolIndex();
if (MI->getOperand(Op+3).getImmedValue())
O << " + " << MI->getOperand(Op+3).getImmedValue();
O << "]";
O << "[";
bool NeedPlus = false;
if (BaseReg.getReg()) {
- printOp(O, BaseReg, RI);
+ printOp(BaseReg);
NeedPlus = true;
}
if (NeedPlus) O << " + ";
if (ScaleVal != 1)
O << ScaleVal << "*";
- printOp(O, IndexReg, RI);
+ printOp(IndexReg);
NeedPlus = true;
}
O << "]";
}
-// print - Print out an x86 instruction in intel syntax
-void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
- const TargetMachine &TM) const {
+/// 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 TargetInstrDescriptor &Desc = get(Opcode);
+ 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
// seen by the assembler (e.g., IMPLICIT_USEs.)
O << "# ";
if (Opcode == X86::PHI) {
- printOp(O, MI->getOperand(0), RI);
+ printOp(MI->getOperand(0));
O << " = phi ";
for (unsigned i = 1, e = MI->getNumOperands(); i != e; i+=2) {
if (i != 1) O << ", ";
O << "[";
- printOp(O, MI->getOperand(i), RI);
+ printOp(MI->getOperand(i));
O << ", ";
- printOp(O, MI->getOperand(i+1), RI);
+ printOp(MI->getOperand(i+1));
O << "]";
}
} else {
unsigned i = 0;
- if (MI->getNumOperands() && (MI->getOperand(0).opIsDefOnly() ||
- MI->getOperand(0).opIsDefAndUse())) {
- printOp(O, MI->getOperand(0), RI);
+ if (MI->getNumOperands() && MI->getOperand(0).isDef()) {
+ printOp(MI->getOperand(0));
O << " = ";
++i;
}
- O << getName(MI->getOpcode());
+ 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(O, MI->getOperand(i), RI);
- if (MI->getOperand(i).opIsDefOnly() ||
- MI->getOperand(i).opIsDefAndUse()) O << "*";
+ if (MI->getOperand(i).isDef()) O << "*";
+ printOp(MI->getOperand(i));
+ if (MI->getOperand(i).isDef()) O << "*";
}
}
O << "\n";
MI->getOperand(0).isGlobalAddress() ||
MI->getOperand(0).isExternalSymbol())) &&
"Illegal raw instruction!");
- O << getName(MI->getOpcode()) << " ";
+ O << TII.getName(MI->getOpcode()) << " ";
if (MI->getNumOperands() == 1) {
- printOp(O, MI->getOperand(0), RI, true); // Don't print "OFFSET"...
+ printOp(MI->getOperand(0), true); // Don't print "OFFSET"...
}
O << "\n";
return;
unsigned Reg = MI->getOperand(0).getReg();
- O << getName(MI->getOpCode()) << " ";
- printOp(O, MI->getOperand(0), RI);
+ 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(O, MI->getOperand(1), RI);
+ 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:
+ // There are three forms of MRMDestReg instructions, those with 2
+ // or 3 operands:
//
- // 2 Operands: this is for things like mov that do not read a second input
+ // 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.
+ // 2 Operands: two address instructions which def&use the first
+ // argument and use the second as input.
//
- // 4 Operands: This form is for instructions which are 3 operands forms, but
- // have a constant argument as well.
+ // 3 Operands: in this form, two address instructions are the same
+ // as in 2 but have a constant argument as well.
//
- bool isTwoAddr = isTwoAddrInstr(Opcode);
+ 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()))))
+ (MI->getNumOperands() == 3 && MI->getOperand(2).isImmediate()))
&& "Bad format for MRMDestReg!");
- O << getName(MI->getOpCode()) << " ";
- printOp(O, MI->getOperand(0), RI);
+ O << TII.getName(MI->getOpcode()) << " ";
+ printOp(MI->getOperand(0));
O << ", ";
- printOp(O, MI->getOperand(1+isTwoAddr), RI);
- if (MI->getNumOperands() == 4) {
+ printOp(MI->getOperand(1));
+ if (MI->getNumOperands() == 3) {
O << ", ";
- printOp(O, MI->getOperand(3), RI);
+ printOp(MI->getOperand(2));
}
O << "\n";
return;
// 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!");
+ assert(isMem(MI, 0) &&
+ (MI->getNumOperands() == 4+1 ||
+ (MI->getNumOperands() == 4+2 && MI->getOperand(5).isImmediate()))
+ && "Bad format for MRMDestMem!");
- O << getName(MI->getOpCode()) << " " << sizePtr(Desc) << " ";
- printMemReference(O, MI, 0, RI);
+ O << TII.getName(MI->getOpcode()) << " " << sizePtr(Desc) << " ";
+ printMemReference(MI, 0);
O << ", ";
- printOp(O, MI->getOperand(4), RI);
+ printOp(MI->getOperand(4));
+ if (MI->getNumOperands() == 4+2) {
+ O << ", ";
+ printOp(MI->getOperand(5));
+ }
O << "\n";
return;
}
case X86II::MRMSrcReg: {
- // There is a two forms that are acceptable for MRMSrcReg instructions,
- // those with 3 and 2 operands:
+ // There are three forms that are acceptable for MRMSrcReg
+ // instructions, those with 2 or 3 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
+ // 2 Operands: this is for things like mov that do not read a
+ // second input.
+ //
+ // 2 Operands: in this form, the last register is the ModR/M
+ // input. The first operand is a def&use. This is for things
+ // like: add r32, r/m32
+ //
+ // 3 Operands: in this form, we can have 'INST R1, R2, imm', which is used
+ // for instructions like the IMULrri 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->getNumOperands() == 2 ||
+ (MI->getNumOperands() == 3 &&
+ (MI->getOperand(2).isImmediate())))
&& "Bad format for MRMSrcReg!");
- if (MI->getNumOperands() == 3 &&
- MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
- O << "**";
- O << getName(MI->getOpCode()) << " ";
- printOp(O, MI->getOperand(0), RI);
+ O << TII.getName(MI->getOpcode()) << " ";
+ printOp(MI->getOperand(0));
O << ", ";
- printOp(O, MI->getOperand(MI->getNumOperands()-1), RI);
+ printOp(MI->getOperand(1));
+ if (MI->getNumOperands() == 3) {
+ O << ", ";
+ printOp(MI->getOperand(2));
+ }
O << "\n";
return;
}
//
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 << getName(MI->getOpCode()) << " ";
- printOp(O, MI->getOperand(0), RI);
+(MI->getNumOperands() == 2+4 && MI->getOperand(5).isImmediate() && isMem(MI, 1))
+ && "Bad format for MRMSrcMem!");
+ O << TII.getName(MI->getOpcode()) << " ";
+ printOp(MI->getOperand(0));
O << ", " << sizePtr(Desc) << " ";
- printMemReference(O, MI, MI->getNumOperands()-4, RI);
+ printMemReference(MI, 1);
+ if (MI->getNumOperands() == 2+4) {
+ O << ", ";
+ printOp(MI->getOperand(5));
+ }
O << "\n";
return;
}
MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
O << "**";
- O << getName(MI->getOpCode()) << " ";
- printOp(O, MI->getOperand(0), RI);
+ O << TII.getName(MI->getOpcode()) << " ";
+ printOp(MI->getOperand(0));
if (MI->getOperand(MI->getNumOperands()-1).isImmediate()) {
O << ", ";
- printOp(O, MI->getOperand(MI->getNumOperands()-1), RI);
+ printOp(MI->getOperand(MI->getNumOperands()-1));
}
+ checkImplUses(Desc);
O << "\n";
return;
//
assert(MI->getNumOperands() >= 4 && MI->getNumOperands() <= 5 &&
isMem(MI, 0) && "Bad MRMSxM format!");
- assert((MI->getNumOperands() != 5 || MI->getOperand(4).isImmediate()) &&
+ assert((MI->getNumOperands() != 5 ||
+ (MI->getOperand(4).isImmediate() ||
+ MI->getOperand(4).isGlobalAddress())) &&
"Bad MRMSxM format!");
- O << getName(MI->getOpCode()) << " ";
+ 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# ";
+ }
+ }
+ }
+
+ // 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# ";
+ }
+ }
+
+ // 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# ";
+ }
+ }
+
+ // 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(O, MI, 0, RI);
+ printMemReference(MI, 0);
if (MI->getNumOperands() == 5) {
O << ", ";
- printOp(O, MI->getOperand(4), RI);
+ printOp(MI->getOperand(4));
}
O << "\n";
return;
}
}
-bool Printer::doInitialization(Module &M)
-{
- // Tell gas we are outputting Intel syntax (not AT&T syntax) assembly,
- // with no % decorations on register names.
- O << "\t.intel_syntax noprefix\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);
return false; // success
}
-bool Printer::doFinalization(Module &M)
-{
+// 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";
+ }
+}
+
+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()) {
+ 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();
- O << "\t.data\n";
- O << "\t.globl " << I->getName() << "\n";
- O << "\t.type " << I->getName() << ",@object\n";
- O << "\t.size " << I->getName() << ","
- << (unsigned)TD->getTypeSize(I->getType()) << "\n";
- O << "\t.align " << (unsigned)TD->getTypeAlignment(C->getType()) << "\n";
- O << I->getName() << ":\t\t\t\t\t#" << *C << "\n";
- printConstantValueOnly (C);
- } else {
- O << "\t.globl " << I->getName() << "\n";
- O << "\t.comm " << I->getName() << ", "
- << (unsigned)TD->getTypeSize(I->getType()) << ", "
- << (unsigned)TD->getTypeAlignment(I->getType()) << "\n";
+ 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
}
projects / oota-llvm.git / blobdiff