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llvm-6502/lib/Target/X86/Printer.cpp
Brian Gaeke d7908f679e Nice tasty llc fixes. These should fix LLC for x86 for everything in 
SingleSource except oopack and Oscar.  (Sorry, Oscar.)

include/llvm/Target/TargetInstrInfo.h: Remove virtual print method. Add
 accessors for ImplicitUses/Defs.
lib/Target/TargetInstrInfo.cpp: Remove virtual print method. If you
 really wanted this, just use MI->print(O, TM); instead...
lib/Target/X86:
FloatingPoint.cpp: ...like this.
X86InstrInfo.h: Remove virtual print method. Define the PrintImplUses
 target-specific flag bit.
X86InstrInfo.def: Add the PrintImplUses flag to all the instructions
 which implicitly use CL, because the assembler needs to see the CL in
 order to generate the right instruction.
Printer.cpp: Ditch fnIndex at Chris's request. Now we use CurrentFnName
  to name constants in the constant pool for each function instead. This
  avoids keeping state between runOnMachineFunction() invocations, which
  is a no-no. Having MangledGlobals be global is a bogon I'd like to get
  rid of too, but making it a static member of Printer causes link errors
  (why???).
 Make NumberForBB into a member of Printer instead of a global, too.
 Make printOp and printMemReference into methods of Printer.
 X86InstrInfo::print is now Printer::printMachineInstruction, because
  TargetInstrInfo::print is history. (Because of this, we have to qualify
  the names of some TargetInstrInfo methods we call.)
 Print out the ImplicitUses field of any instruction we print that has
  the PrintImplUses bit set.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6924 91177308-0d34-0410-b5e6-96231b3b80d8
2003-06-27 00:00:48 +00:00

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//===-- X86/Printer.cpp - Convert X86 code to human readable rep. ---------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
#include "X86.h"
#include "X86InstrInfo.h"
#include "llvm/Function.h"
#include "llvm/Constant.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.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"
namespace {
std::set<const Value *> MangledGlobals;
struct Printer : public MachineFunctionPass {
std::ostream &O;
typedef std::map<const Value *, unsigned> ValueMapTy;
ValueMapTy NumberForBB;
Printer(std::ostream &o) : O(o) {}
const TargetData *TD;
std::string CurrentFnName;
virtual const char *getPassName() const {
return "X86 Assembly Printer";
}
void printMachineInstruction(const MachineInstr *MI, std::ostream &O,
const TargetMachine &TM) const;
void printOp(std::ostream &O, const MachineOperand &MO,
const MRegisterInfo &RI, bool elideOffsetKeyword = false) const;
void printMemReference(std::ostream &O, const MachineInstr *MI,
unsigned Op,
const MRegisterInfo &RI) const;
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);
};
} // 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.
///
Pass *createX86CodePrinterPass(std::ostream &O) {
return new Printer(O);
}
// We don't want identifier names with ., space, or - in them,
// so we replace them with underscores.
static std::string makeNameProper(std::string x) {
std::string tmp;
for (std::string::iterator sI = x.begin(), sEnd = x.end(); sI != sEnd; sI++)
switch (*sI) {
case '.': tmp += "d_"; break;
case ' ': tmp += "s_"; break;
case '-': tmp += "D_"; break;
default: tmp += *sI;
}
return tmp;
}
static std::string getValueName(const Value *V) {
if (V->hasName()) { // Print out the label if it exists...
// Name mangling occurs as follows:
// - If V is not a global, mangling always occurs.
// - Otherwise, mangling occurs when any of the following are true:
// 1) V has internal linkage
// 2) V's name would collide if it is not mangled.
//
if(const GlobalValue* gv = dyn_cast<GlobalValue>(V)) {
if(!gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
// No internal linkage, name will not collide -> no mangling.
return makeNameProper(gv->getName());
}
}
// Non-global, or global with internal linkage / colliding name -> mangle.
return "l" + utostr(V->getType()->getUniqueID()) + "_" +
makeNameProper(V->getName());
}
static int Count = 0;
Count++;
return "ltmp_" + itostr(Count) + "_" + utostr(V->getType()->getUniqueID());
}
// 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 += getValueName(GV);
}
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;
}
// 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 << getValueName(CPR->getValue()) << "\n";
}
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
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!");
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();
if (C == '"') {
Result += "\\\"";
} else if (C == '\\') {
Result += "\\\\";
} else if (isprint(C)) {
Result += 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;
default:
Result += '\\';
Result += toOctal(C >> 6);
Result += toOctal(C >> 3);
Result += toOctal(C >> 0);
break;
}
}
}
Result += "\"";
return Result;
}
// 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";
}
else if (CVA)
{ // 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()));
}
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!");
}
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));
}
}
// printConstantPool - Print out any constants which have been spilled to
// memory...
void Printer::printConstantPool(MachineConstantPool *MCP){
const std::vector<Constant*> &CP = MCP->getConstants();
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";
printConstantValueOnly (CP[i]);
}
}
/// runOnMachineFunction - This uses the X86InstructionInfo::print method
/// to print assembly for each instruction.
bool Printer::runOnMachineFunction(MachineFunction &MF) {
static unsigned BBNumber = 0;
const TargetMachine &TM = MF.getTarget();
const TargetInstrInfo &TII = TM.getInstrInfo();
TD = &TM.getTargetData();
// What's my mangled name?
CurrentFnName = 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";
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 << ".BB" << 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, O, TM);
}
}
// 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();
}
void Printer::printOp(std::ostream &O, const MachineOperand &MO,
const MRegisterInfo &RI,
bool elideOffsetKeyword /* = false */) const {
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)
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 I previously put in the NumberForBB map!");
O << ".BB" << i->second << " # PC rel: " << MO.getVRegValue()->getName();
}
return;
case MachineOperand::MO_GlobalAddress:
if (!elideOffsetKeyword) O << "OFFSET "; O << 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(std::ostream &O, const MachineInstr *MI,
unsigned Op,
const MRegisterInfo &RI) const {
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(O, BaseReg, RI);
NeedPlus = true;
}
if (IndexReg.getReg()) {
if (NeedPlus) O << " + ";
if (ScaleVal != 1)
O << ScaleVal << "*";
printOp(O, IndexReg, RI);
NeedPlus = true;
}
if (DispVal) {
if (NeedPlus)
if (DispVal > 0)
O << " + ";
else {
O << " - ";
DispVal = -DispVal;
}
O << DispVal;
}
O << "]";
}
/// printMachineInstruction -- Print out an x86 instruction in intel syntax
///
void Printer::printMachineInstruction(const MachineInstr *MI, std::ostream &O,
const TargetMachine &TM) const {
unsigned Opcode = MI->getOpcode();
const TargetInstrInfo &TII = TM.getInstrInfo();
const TargetInstrDescriptor &Desc = TII.get(Opcode);
const MRegisterInfo &RI = *TM.getRegisterInfo();
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(O, MI->getOperand(0), RI);
O << " = phi ";
for (unsigned i = 1, e = MI->getNumOperands(); i != e; i+=2) {
if (i != 1) O << ", ";
O << "[";
printOp(O, MI->getOperand(i), RI);
O << ", ";
printOp(O, MI->getOperand(i+1), RI);
O << "]";
}
} else {
unsigned i = 0;
if (MI->getNumOperands() && (MI->getOperand(0).opIsDefOnly() ||
MI->getOperand(0).opIsDefAndUse())) {
printOp(O, MI->getOperand(0), RI);
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(O, MI->getOperand(i), RI);
if (MI->getOperand(i).opIsDefOnly() ||
MI->getOperand(i).opIsDefAndUse()) O << "*";
}
}
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(O, MI->getOperand(0), RI, 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(O, MI->getOperand(0), RI);
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);
}
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(O, MI->getOperand(0), RI);
O << ", ";
printOp(O, MI->getOperand(1+isTwoAddr), RI);
if (MI->getNumOperands() == 4) {
O << ", ";
printOp(O, MI->getOperand(3), RI);
}
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(O, MI, 0, RI);
O << ", ";
printOp(O, MI->getOperand(4), RI);
O << "\n";
return;
}
case X86II::MRMSrcReg: {
// There is a two 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
//
// 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()))
&& "Bad format for MRMSrcReg!");
if (MI->getNumOperands() == 3 &&
MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
O << "**";
O << TII.getName(MI->getOpCode()) << " ";
printOp(O, MI->getOperand(0), RI);
O << ", ";
printOp(O, MI->getOperand(MI->getNumOperands()-1), RI);
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(O, MI->getOperand(0), RI);
O << ", " << sizePtr(Desc) << " ";
printMemReference(O, MI, MI->getNumOperands()-4, RI);
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(O, MI->getOperand(0), RI);
if (MI->getOperand(MI->getNumOperands()-1).isImmediate()) {
O << ", ";
printOp(O, MI->getOperand(MI->getNumOperands()-1), RI);
}
if (Desc.TSFlags & X86II::PrintImplUses) {
for (const unsigned *p = Desc.ImplicitUses; *p; ++p) {
O << ", " << RI.get(*p).Name;
}
}
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()) &&
"Bad MRMSxM format!");
O << TII.getName(MI->getOpCode()) << " ";
O << sizePtr(Desc) << " ";
printMemReference(O, MI, 0, RI);
if (MI->getNumOperands() == 5) {
O << ", ";
printOp(O, MI->getOperand(4), RI);
}
O << "\n";
return;
}
default:
O << "\tUNKNOWN FORM:\t\t-"; MI->print(O, TM); break;
}
}
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";
// Ripped from CWriter:
// Calculate which global values have names that will collide when we throw
// away type information.
{ // Scope to delete the FoundNames set when we are done with it...
std::set<std::string> FoundNames;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->hasName()) // If the global has a name...
if (FoundNames.count(I->getName())) // And the name is already used
MangledGlobals.insert(I); // Mangle the name
else
FoundNames.insert(I->getName()); // Otherwise, keep track of name
for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
if (I->hasName()) // If the global has a name...
if (FoundNames.count(I->getName())) // And the name is already used
MangledGlobals.insert(I); // Mangle the name
else
FoundNames.insert(I->getName()); // Otherwise, keep track of name
}
return false; // success
}
bool Printer::doFinalization(Module &M)
{
// Print out module-level global variables here.
for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) {
std::string name(getValueName(I));
if (I->hasInitializer()) {
Constant *C = I->getInitializer();
O << "\t.data\n";
O << "\t.globl " << name << "\n";
O << "\t.type " << name << ",@object\n";
O << "\t.size " << name << ","
<< (unsigned)TD->getTypeSize(I->getType()) << "\n";
O << "\t.align " << (unsigned)TD->getTypeAlignment(C->getType()) << "\n";
O << name << ":\t\t\t\t\t#" << *C << "\n";
printConstantValueOnly (C);
} else {
O << "\t.globl " << name << "\n";
O << "\t.comm " << name << ", "
<< (unsigned)TD->getTypeSize(I->getType()) << ", "
<< (unsigned)TD->getTypeAlignment(I->getType()) << "\n";
}
}
MangledGlobals.clear();
return false; // success
}
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