lib/Target/X86/AsmPrinter/X86ATTInstPrinter.cpp

   1 //===-- X86ATTInstPrinter.cpp - AT&T assembly instruction printing --------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file includes code for rendering MCInst instances as AT&T-style
  11 // assembly.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define DEBUG_TYPE "asm-printer"
  16 #include "llvm/MC/MCInst.h"
  17 #include "X86ATTAsmPrinter.h"
  18 #include "llvm/Target/TargetAsmInfo.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20 #include "llvm/Support/FormattedStream.h"
  21 using namespace llvm;
  22
  23 // Include the auto-generated portion of the assembly writer.
  24 #define MachineInstr MCInst
  25 #define NO_ASM_WRITER_BOILERPLATE
  26 #include "X86GenAsmWriter.inc"
  27 #undef MachineInstr
  28
  29 void X86ATTAsmPrinter::printSSECC(const MCInst *MI, unsigned Op) {
  30   switch (MI->getOperand(Op).getImm()) {
  31   default: llvm_unreachable("Invalid ssecc argument!");
  32   case 0: O << "eq"; break;
  33   case 1: O << "lt"; break;
  34   case 2: O << "le"; break;
  35   case 3: O << "unord"; break;
  36   case 4: O << "neq"; break;
  37   case 5: O << "nlt"; break;
  38   case 6: O << "nle"; break;
  39   case 7: O << "ord"; break;
  40   }
  41 }
  42
  43
  44 void X86ATTAsmPrinter::printPICLabel(const MCInst *MI, unsigned Op) {
  45   llvm_unreachable("This is only used for MOVPC32r,"
  46                    "should lower before asm printing!");
  47 }
  48
  49
  50 /// print_pcrel_imm - This is used to print an immediate value that ends up
  51 /// being encoded as a pc-relative value.  These print slightly differently, for
  52 /// example, a $ is not emitted.
  53 void X86ATTAsmPrinter::print_pcrel_imm(const MCInst *MI, unsigned OpNo) {
  54   const MCOperand &Op = MI->getOperand(OpNo);
  55
  56   if (Op.isImm())
  57     O << Op.getImm();
  58   else if (Op.isMCValue())
  59     Op.getMCValue().print(O);
  60   else if (Op.isMBBLabel())
  61     // FIXME: Keep in sync with printBasicBlockLabel.  printBasicBlockLabel
  62     // should eventually call into this code, not the other way around.
  63     O << TAI->getPrivateGlobalPrefix() << "BB" << Op.getMBBLabelFunction()
  64       << '_' << Op.getMBBLabelBlock();
  65   else
  66     llvm_unreachable("Unknown pcrel immediate operand");
  67 }
  68
  69
  70 void X86ATTAsmPrinter::printOperand(const MCInst *MI, unsigned OpNo,
  71                                     const char *Modifier) {
  72   assert(Modifier == 0 && "Modifiers should not be used");
  73
  74   const MCOperand &Op = MI->getOperand(OpNo);
  75   if (Op.isReg()) {
  76     O << '%';
  77     unsigned Reg = Op.getReg();
  78 #if 0
  79     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
  80       EVT VT = (strcmp(Modifier+6,"64") == 0) ?
  81       EVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? EVT::i32 :
  82                   ((strcmp(Modifier+6,"16") == 0) ? EVT::i16 : EVT::i8));
  83       Reg = getX86SubSuperRegister(Reg, VT);
  84     }
  85 #endif
  86     O << TRI->getAsmName(Reg);
  87     return;
  88   } else if (Op.isImm()) {
  89     //if (!Modifier || (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
  90     O << '$';
  91     O << Op.getImm();
  92     return;
  93   } else if (Op.isMCValue()) {
  94     O << '$';
  95     Op.getMCValue().print(O);
  96     return;
  97   }
  98
  99   O << "<<UNKNOWN OPERAND KIND>>";
 100 }
 101
 102 void X86ATTAsmPrinter::printLeaMemReference(const MCInst *MI, unsigned Op) {
 103
 104   const MCOperand &BaseReg  = MI->getOperand(Op);
 105   const MCOperand &IndexReg = MI->getOperand(Op+2);
 106   const MCOperand &DispSpec = MI->getOperand(Op+3);
 107
 108   if (DispSpec.isImm()) {
 109     int64_t DispVal = DispSpec.getImm();
 110     if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
 111       O << DispVal;
 112   } else if (DispSpec.isMCValue()) {
 113     DispSpec.getMCValue().print(O);
 114   } else {
 115     llvm_unreachable("non-immediate displacement for LEA?");
 116     //assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
 117     //       DispSpec.isJTI() || DispSpec.isSymbol());
 118     //printOperand(MI, Op+3, "mem");
 119   }
 120
 121   if (IndexReg.getReg() || BaseReg.getReg()) {
 122     // There are cases where we can end up with ESP/RSP in the indexreg slot.
 123     // If this happens, swap the base/index register to support assemblers that
 124     // don't work when the index is *SP.
 125     // FIXME: REMOVE THIS.
 126     assert(IndexReg.getReg() != X86::ESP && IndexReg.getReg() != X86::RSP);
 127
 128     O << '(';
 129     if (BaseReg.getReg())
 130       printOperand(MI, Op);
 131
 132     if (IndexReg.getReg()) {
 133       O << ',';
 134       printOperand(MI, Op+2);
 135       unsigned ScaleVal = MI->getOperand(Op+1).getImm();
 136       if (ScaleVal != 1)
 137         O << ',' << ScaleVal;
 138     }
 139     O << ')';
 140   }
 141 }
 142
 143 void X86ATTAsmPrinter::printMemReference(const MCInst *MI, unsigned Op) {
 144   const MCOperand &Segment = MI->getOperand(Op+4);
 145   if (Segment.getReg()) {
 146     printOperand(MI, Op+4);
 147     O << ':';
 148   }
 149   printLeaMemReference(MI, Op);
 150 }