#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "Support/Statistic.h"
namespace {
struct Printer : public FunctionPass {
MachineFunction & MF = MachineFunction::get (&F);
const MachineInstrInfo & MII = TM.getInstrInfo ();
- O << "# x86 printing only sorta implemented so far!\n";
+ O << "; x86 printing only sorta implemented so far!\n";
// Print out labels for the function.
O << "\t.globl\t" << F.getName () << "\n";
{
// Print the assembly for the instruction.
O << "\t";
- MII.print(*i_i, O);
+ MII.print(*i_i, O, TM);
}
}
return false;
}
+static void printOp(std::ostream &O, const MachineOperand &MO,
+ const MRegisterInfo &RI) {
+ switch (MO.getType()) {
+ case MachineOperand::MO_VirtualRegister:
+ case MachineOperand::MO_MachineRegister:
+ if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
+ O << RI.get(MO.getReg()).Name;
+ else
+ O << "%reg" << MO.getReg();
+ return;
+
+ default:
+ O << "<unknown op ty>"; return;
+ }
+}
+
+static inline void toHexDigit(std::ostream &O, unsigned char V) {
+ if (V >= 10)
+ O << (char)('A'+V-10);
+ else
+ O << (char)('0'+V);
+}
+
+static std::ostream &toHex(std::ostream &O, unsigned char V) {
+ toHexDigit(O, V >> 4);
+ toHexDigit(O, V & 0xF);
+ return O;
+}
+
+
+static bool isReg(const MachineOperand &MO) {
+ return MO.getType()==MachineOperand::MO_VirtualRegister ||
+ MO.getType()==MachineOperand::MO_MachineRegister;
+}
+
+
+// getX86RegNum - This function maps LLVM register identifiers to their X86
+// specific numbering, which is used in various places encoding instructions.
+//
+static unsigned getX86RegNum(unsigned RegNo) {
+ switch(RegNo) {
+ case X86::EAX: case X86::AX: case X86::AL: return 0;
+ case X86::ECX: case X86::CX: case X86::CL: return 1;
+ case X86::EDX: case X86::DX: case X86::DL: return 2;
+ case X86::EBX: case X86::BX: case X86::BL: return 3;
+ case X86::ESP: case X86::SP: case X86::AH: return 4;
+ case X86::EBP: case X86::BP: case X86::CH: return 5;
+ case X86::ESI: case X86::SI: case X86::DH: return 6;
+ case X86::EDI: case X86::DI: case X86::BH: return 7;
+ default:
+ assert(RegNo >= MRegisterInfo::FirstVirtualRegister &&
+ "Unknown physical register!");
+ DEBUG(std::cerr << "Register allocator hasn't allocated " << RegNo
+ << " correctly yet!\n");
+ return 0;
+ }
+}
+
+inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
+ unsigned RM) {
+ assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
+ return RM | (RegOpcode << 3) | (Mod << 6);
+}
+
+static unsigned char regModRMByte(unsigned ModRMReg, unsigned RegOpcodeField) {
+ return ModRMByte(3, RegOpcodeField, getX86RegNum(ModRMReg));
+}
+
// print - Print out an x86 instruction in intel syntax
-void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O) const {
- // FIXME: This sucks.
- O << getName(MI->getOpCode()) << "\n";
+void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
+ const TargetMachine &TM) const {
+ unsigned Opcode = MI->getOpcode();
+ const MachineInstrDescriptor &Desc = get(Opcode);
+
+ // Print instruction prefixes if neccesary
+
+ if (Desc.TSFlags & X86II::OpSize) O << "66 "; // Operand size...
+ if (Desc.TSFlags & X86II::TB) O << "0F "; // Two-byte opcode prefix
+
+ switch (Desc.TSFlags & X86II::FormMask) {
+ case X86II::OtherFrm:
+ O << "\t\t";
+ O << "-"; MI->print(O, TM);
+ break;
+ case X86II::RawFrm:
+ toHex(O, getBaseOpcodeFor(Opcode)) << "\t\t";
+ O << getName(MI->getOpCode()) << " ";
+
+ for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+ if (i) O << ", ";
+ printOp(O, MI->getOperand(i), RI);
+ }
+ O << "\n";
+ return;
+
+
+ case X86II::AddRegFrm:
+ O << "\t\t-"; MI->print(O, TM); break;
+
+ case X86II::MRMDestReg: {
+ // There are two acceptable forms of MRMDestReg instructions, those with 3
+ // and 2 operands:
+ //
+ // 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: this is for things like mov that do not read a second input
+ //
+ assert(isReg(MI->getOperand(0)) &&
+ (MI->getNumOperands() == 2 ||
+ (MI->getNumOperands() == 3 && isReg(MI->getOperand(1)))) &&
+ isReg(MI->getOperand(MI->getNumOperands()-1))
+ && "Bad format for MRMDestReg!");
+ if (MI->getNumOperands() == 3 &&
+ MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
+ O << "**";
+
+ toHex(O, getBaseOpcodeFor(Opcode)) << " ";
+ unsigned ModRMReg = MI->getOperand(0).getReg();
+ unsigned ExtraReg = MI->getOperand(MI->getNumOperands()-1).getReg();
+ toHex(O, regModRMByte(ModRMReg, getX86RegNum(ExtraReg)));
+
+ O << "\t\t";
+ O << getName(MI->getOpCode()) << " ";
+ printOp(O, MI->getOperand(0), RI);
+ O << ", ";
+ printOp(O, MI->getOperand(MI->getNumOperands()-1), 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(isReg(MI->getOperand(0)) &&
+ isReg(MI->getOperand(1)) &&
+ (MI->getNumOperands() == 2 ||
+ (MI->getNumOperands() == 3 && isReg(MI->getOperand(2))))
+ && "Bad format for MRMDestReg!");
+ if (MI->getNumOperands() == 3 &&
+ MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
+ O << "**";
+
+ toHex(O, getBaseOpcodeFor(Opcode)) << " ";
+ unsigned ModRMReg = MI->getOperand(MI->getNumOperands()-1).getReg();
+ unsigned ExtraReg = MI->getOperand(0).getReg();
+ toHex(O, regModRMByte(ModRMReg, getX86RegNum(ExtraReg)));
+
+ O << "\t";
+ O << getName(MI->getOpCode()) << " ";
+ printOp(O, MI->getOperand(0), RI);
+ O << ", ";
+ printOp(O, MI->getOperand(MI->getNumOperands()-1), RI);
+ O << "\n";
+ return;
+ }
+ case X86II::MRMDestMem:
+ case X86II::MRMSrcMem:
+ default:
+ O << "\t\t-"; MI->print(O, TM); break;
+ }
}
projects / oota-llvm.git / blobdiff