X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FX86%2FPrinter.cpp;h=bfaa4bd1acd30c287178a2092f8f87bdaddc95d3;hb=2adb3959f629bdacab0e47b29e52139595523236;hp=746e31221d603514ec597230af8cbb4ff1d51b20;hpb=77875d88d0d45e7da162b99887743f7134fec2bb;p=oota-llvm.git

diff --git a/lib/Target/X86/Printer.cpp b/lib/Target/X86/Printer.cpp
index 746e31221d6..bfaa4bd1acd 100644
--- a/lib/Target/X86/Printer.cpp
+++ b/lib/Target/X86/Printer.cpp
@@ -42,8 +42,6 @@ bool Printer::runOnFunction (Function & F)
   MachineFunction & MF = MachineFunction::get (&F);
   const MachineInstrInfo & MII = TM.getInstrInfo ();
 
-  O << "; x86 printing only sorta implemented so far!\n";
-
   // Print out labels for the function.
   O << "\t.globl\t" << F.getName () << "\n";
   O << "\t.type\t" << F.getName () << ", @function\n";
@@ -68,10 +66,40 @@ bool Printer::runOnFunction (Function & F)
   return false;
 }
 
+static bool isReg(const MachineOperand &MO) {
+  return MO.getType() == MachineOperand::MO_VirtualRegister ||
+         MO.getType() == MachineOperand::MO_MachineRegister;
+}
+
+static bool isImmediate(const MachineOperand &MO) {
+  return MO.getType() == MachineOperand::MO_SignExtendedImmed ||
+         MO.getType() == MachineOperand::MO_UnextendedImmed;
+}
+
+static bool isPCRelativeDisp(const MachineOperand &MO) {
+  return MO.getType() == MachineOperand::MO_PCRelativeDisp;
+}
+
+static bool isScale(const MachineOperand &MO) {
+  return isImmediate(MO) &&
+           (MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
+            MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
+}
+
+static bool isMem(const MachineInstr *MI, unsigned Op) {
+  return Op+4 <= MI->getNumOperands() &&
+         isReg(MI->getOperand(Op  )) && isScale(MI->getOperand(Op+1)) &&
+         isReg(MI->getOperand(Op+2)) && isImmediate(MI->getOperand(Op+3));
+}
+
 static void printOp(std::ostream &O, const MachineOperand &MO,
                     const MRegisterInfo &RI) {
   switch (MO.getType()) {
   case MachineOperand::MO_VirtualRegister:
+    if (Value *V = MO.getVRegValueOrNull()) {
+      O << "<" << V->getName() << ">";
+      return;
+    }
   case MachineOperand::MO_MachineRegister:
     if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
       O << RI.get(MO.getReg()).Name;
@@ -83,132 +111,89 @@ static void printOp(std::ostream &O, const MachineOperand &MO,
   case MachineOperand::MO_UnextendedImmed:
     O << (int)MO.getImmedValue();
     return;
+  case MachineOperand::MO_PCRelativeDisp:
+    O << "<" << MO.getVRegValue()->getName() << ">";
+    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 std::ostream &emitConstant(std::ostream &O, unsigned Val, unsigned Size){
-  // Output the constant in little endian byte order...
-  for (unsigned i = 0; i != Size; ++i) {
-    toHex(O, Val) << " ";
-    Val >>= 8;
+static void printMemReference(std::ostream &O, const MachineInstr *MI,
+                              unsigned Op, const MRegisterInfo &RI) {
+  assert(isMem(MI, Op) && "Invalid memory reference!");
+  const MachineOperand &BaseReg  = MI->getOperand(Op);
+  const MachineOperand &Scale    = MI->getOperand(Op+1);
+  const MachineOperand &IndexReg = MI->getOperand(Op+2);
+  const MachineOperand &Disp     = MI->getOperand(Op+3);
+
+  O << "[";
+  bool NeedPlus = false;
+  if (BaseReg.getReg()) {
+    printOp(O, BaseReg, RI);
+    NeedPlus = true;
   }
-  return O;
-}
-
 
-static bool isReg(const MachineOperand &MO) {
-  return MO.getType() == MachineOperand::MO_VirtualRegister ||
-         MO.getType() == MachineOperand::MO_MachineRegister;
-}
-
-static bool isImmediate(const MachineOperand &MO) {
-  return MO.getType() == MachineOperand::MO_SignExtendedImmed ||
-         MO.getType() == MachineOperand::MO_UnextendedImmed;
-}
-
-
-// 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;
+  if (IndexReg.getReg()) {
+    if (NeedPlus) O << " + ";
+    if (IndexReg.getImmedValue() != 1)
+      O << IndexReg.getImmedValue() << "*";
+    printOp(O, IndexReg, RI);
+    NeedPlus = true;
   }
-}
-
-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));
+  if (Disp.getImmedValue()) {
+    if (NeedPlus) O << " + ";
+    printOp(O, Disp, RI);
+  }
+  O << "]";
 }
 
-
 // print - Print out an x86 instruction in intel syntax
 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\t";
-    O << "-"; MI->print(O, TM);
-    break;
   case X86II::RawFrm:
-    toHex(O, getBaseOpcodeFor(Opcode));
-    O << "\n\t\t\t\t";
+    // The accepted forms of Raw instructions are:
+    //   1. nop     - No operand required
+    //   2. jmp foo - PC relative displacement operand
+    //
+    assert(MI->getNumOperands() == 0 ||
+           (MI->getNumOperands() == 1 && isPCRelativeDisp(MI->getOperand(0))) &&
+           "Illegal raw instruction!");
     O << getName(MI->getOpCode()) << " ";
 
-    for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
-      if (i) O << ", ";
-      printOp(O, MI->getOperand(i), RI);
+    if (MI->getNumOperands() == 1) {
+      printOp(O, MI->getOperand(0), RI);
     }
     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.).
+    // (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.
     //
     assert(isReg(MI->getOperand(0)) &&
            (MI->getNumOperands() == 1 || 
-            (MI->getNumOperands() == 2 && isImmediate(MI->getOperand(1)))) &&
+            (MI->getNumOperands() == 2 &&
+             (MI->getOperand(1).getVRegValueOrNull() ||
+              isImmediate(MI->getOperand(1))))) &&
            "Illegal form for AddRegFrm instruction!");
 
     unsigned Reg = MI->getOperand(0).getReg();
-    toHex(O, getBaseOpcodeFor(Opcode) + getX86RegNum(Reg)) << " ";
-
-    if (MI->getNumOperands() == 2) {
-      unsigned Size = 4;
-      emitConstant(O, MI->getOperand(1).getImmedValue(), Size);
-    }
     
-    O << "\n\t\t\t\t";
     O << getName(MI->getOpCode()) << " ";
     printOp(O, MI->getOperand(0), RI);
     if (MI->getNumOperands() == 2) {
       O << ", ";
-      printOp(O, MI->getOperand(MI->getNumOperands()-1), RI);
+      printOp(O, MI->getOperand(1), RI);
     }
     O << "\n";
     return;
@@ -233,12 +218,6 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
         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 << "\n\t\t\t\t";
     O << getName(MI->getOpCode()) << " ";
     printOp(O, MI->getOperand(0), RI);
     O << ", ";
@@ -246,6 +225,22 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
     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 &&
+           isReg(MI->getOperand(4)) && "Bad format for MRMDestMem!");
+
+    O << getName(MI->getOpCode()) << " <SIZE> PTR ";
+    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:
@@ -265,12 +260,6 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
         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 << "\n\t\t\t\t";
     O << getName(MI->getOpCode()) << " ";
     printOp(O, MI->getOperand(0), RI);
     O << ", ";
@@ -278,8 +267,62 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
     O << "\n";
     return;
   }
-  case X86II::MRMDestMem:
-  case X86II::MRMSrcMem:
+
+  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(isReg(MI->getOperand(0)) &&
+           (MI->getNumOperands() == 1+4 && isMem(MI, 1)) || 
+           (MI->getNumOperands() == 2+4 && isReg(MI->getOperand(1)) && 
+            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);
+    O << ", <SIZE> PTR ";
+    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 &&
+           isReg(MI->getOperand(0)) && "Bad MRMSxR format!");
+    assert((MI->getNumOperands() != 2 ||
+            isReg(MI->getOperand(1)) || isImmediate(MI->getOperand(1))) &&
+           "Bad MRMSxR format!");
+    assert((MI->getNumOperands() < 3 ||
+            (isReg(MI->getOperand(1)) && isImmediate(MI->getOperand(2)))) &&
+           "Bad MRMSxR format!");
+
+    if (MI->getNumOperands() > 1 && isReg(MI->getOperand(1)) && 
+        MI->getOperand(0).getReg() != MI->getOperand(1).getReg())
+      O << "**";
+
+    O << getName(MI->getOpCode()) << " ";
+    printOp(O, MI->getOperand(0), RI);
+    if (isImmediate(MI->getOperand(MI->getNumOperands()-1))) {
+      O << ", ";
+      printOp(O, MI->getOperand(MI->getNumOperands()-1), RI);
+    }
+    O << "\n";
+
+    return;
+  }
+
   default:
     O << "\t\t\t-"; MI->print(O, TM); break;
   }