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Code Issues Projects Releases Wiki Activity

* Prune #includes

Browse Source 
* Update comments
* Rearrange code a bit
* Finally ELIMINATE the GAS workaround emitter for Intel mode.  woot!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16647 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-04 07:31:08 +00:00
parent ac5701c562
commit 955f09666d
1 changed files with 27 additions and 101 deletions
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128
lib/Target/X86/X86AsmPrinter.cpp
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@ -8,32 +8,48 @@
//===----------------------------------------------------------------------===//
//
// 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.
// of machine-dependent LLVM code to Intel and AT&T 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 "X86TargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
enum AsmWriterFlavor { att, intel };
cl::opt<AsmWriterFlavor>
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));
struct X86SharedAsmPrinter : public AsmPrinter {
X86SharedAsmPrinter(std::ostream &O, TargetMachine &TM)
: AsmPrinter(O, TM) { }
void printConstantPool(MachineConstantPool *MCP);
bool doFinalization(Module &M);
};
}
static bool isScale(const MachineOperand &MO) {
return MO.isImmediate() &&
(MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
@ -60,16 +76,6 @@ static void SwitchSection(std::ostream &OS, std::string &CurSection,
}
}
namespace {
struct X86SharedAsmPrinter : public AsmPrinter {
X86SharedAsmPrinter(std::ostream &O, TargetMachine &TM)
: AsmPrinter(O, TM) { }
void printConstantPool(MachineConstantPool *MCP);
bool doFinalization(Module &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
@ -156,48 +162,6 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
}
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
enum AsmWriterFlavor { att, intel };
cl::opt<AsmWriterFlavor>
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));
struct GasBugWorkaroundEmitter : public MachineCodeEmitter {
GasBugWorkaroundEmitter(std::ostream& o)
: O(o), OldFlags(O.flags()), firstByte(true) {
O << std::hex;
}
~GasBugWorkaroundEmitter() {
O.flags(OldFlags);
}
virtual void emitByte(unsigned char B) {
if (!firstByte) O << "\n\t";
firstByte = false;
O << ".byte 0x" << (unsigned) B;
}
// These should never be called
virtual void emitWord(unsigned W) { assert(0); }
virtual uint64_t getGlobalValueAddress(GlobalValue *V) { abort(); }
virtual uint64_t getGlobalValueAddress(const std::string &Name) { abort(); }
virtual uint64_t getConstantPoolEntryAddress(unsigned Index) { abort(); }
virtual uint64_t getCurrentPCValue() { abort(); }
virtual uint64_t forceCompilationOf(Function *F) { abort(); }
private:
std::ostream& O;
std::ios::fmtflags OldFlags;
bool firstByte;
};
struct X86IntelAsmPrinter : public X86SharedAsmPrinter {
X86IntelAsmPrinter(std::ostream &O, TargetMachine &TM)
: X86SharedAsmPrinter(O, TM) { }
@ -396,42 +360,8 @@ void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// gas bugs:
//
// 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.
//
// 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.
//
// 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.
//
// 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 the raw opcode bytes instead of the instruction.
switch (MI->getOpcode()) {
case X86::FSTP80m:
case X86::FLD80m:
case X86::FILD64m:
case X86::FISTP64m:
GasBugWorkaroundEmitter gwe(O);
X86::emitInstruction(gwe, (X86InstrInfo&)*TM.getInstrInfo(), *MI);
O << "\t# ";
}
// Call the autogenerated instruction printer routines.
bool Handled = printInstruction(MI);
if (!Handled) {
MI->dump();
assert(0 && "Do not know how to print this instruction!");
abort();
}
printInstruction(MI);
}
bool X86IntelAsmPrinter::doInitialization(Module &M) {
@ -612,11 +542,7 @@ void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// Call the autogenerated instruction printer routines.
if (!printInstruction(MI)) {
MI->dump();
assert(0 && "Do not know how to print this instruction!");
abort();
}
printInstruction(MI);
}