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      1 //===-- MCInstPrinter.cpp - Convert an MCInst to target assembly syntax ---===//
      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 #include "llvm/MC/MCInstPrinter.h"
     11 #include "llvm/ADT/StringRef.h"
     12 #include "llvm/MC/MCAsmInfo.h"
     13 #include "llvm/MC/MCInstrInfo.h"
     14 #include "llvm/Support/ErrorHandling.h"
     15 #include "llvm/Support/Format.h"
     16 #include "llvm/Support/raw_ostream.h"
     17 using namespace llvm;
     18 
     19 void llvm::dumpBytes(ArrayRef<uint8_t> bytes, raw_ostream &OS) {
     20   static const char hex_rep[] = "0123456789abcdef";
     21   for (char i: bytes) {
     22     OS << hex_rep[(i & 0xF0) >> 4];
     23     OS << hex_rep[i & 0xF];
     24     OS << ' ';
     25   }
     26 }
     27 
     28 MCInstPrinter::~MCInstPrinter() {
     29 }
     30 
     31 /// getOpcodeName - Return the name of the specified opcode enum (e.g.
     32 /// "MOV32ri") or empty if we can't resolve it.
     33 StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
     34   return MII.getName(Opcode);
     35 }
     36 
     37 void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
     38   llvm_unreachable("Target should implement this");
     39 }
     40 
     41 void MCInstPrinter::printAnnotation(raw_ostream &OS, StringRef Annot) {
     42   if (!Annot.empty()) {
     43     if (CommentStream) {
     44       (*CommentStream) << Annot;
     45       // By definition (see MCInstPrinter.h), CommentStream must end with
     46       // a newline after each comment.
     47       if (Annot.back() != '\n')
     48         (*CommentStream) << '\n';
     49     } else
     50       OS << " " << MAI.getCommentString() << " " << Annot;
     51   }
     52 }
     53 
     54 /// Utility functions to make adding mark ups simpler.
     55 StringRef MCInstPrinter::markup(StringRef s) const {
     56   if (getUseMarkup())
     57     return s;
     58   else
     59     return "";
     60 }
     61 StringRef MCInstPrinter::markup(StringRef a, StringRef b) const {
     62   if (getUseMarkup())
     63     return a;
     64   else
     65     return b;
     66 }
     67 
     68 // For asm-style hex (e.g. 0ffh) the first digit always has to be a number.
     69 static bool needsLeadingZero(uint64_t Value)
     70 {
     71   while(Value)
     72   {
     73     uint64_t digit = (Value >> 60) & 0xf;
     74     if (digit != 0)
     75       return (digit >= 0xa);
     76     Value <<= 4;
     77   }
     78   return false;
     79 }
     80 
     81 format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const {
     82   return format("%" PRId64, Value);
     83 }
     84 
     85 format_object<int64_t> MCInstPrinter::formatHex(int64_t Value) const {
     86   switch(PrintHexStyle) {
     87   case HexStyle::C:
     88     if (Value < 0)
     89       return format("-0x%" PRIx64, -Value);
     90     else
     91       return format("0x%" PRIx64, Value);
     92   case HexStyle::Asm:
     93     if (Value < 0) {
     94       if (needsLeadingZero((uint64_t)(-Value)))
     95         return format("-0%" PRIx64 "h", -Value);
     96       else
     97         return format("-%" PRIx64 "h", -Value);
     98     } else {
     99       if (needsLeadingZero((uint64_t)(Value)))
    100         return format("0%" PRIx64 "h", Value);
    101       else
    102         return format("%" PRIx64 "h", Value);
    103     }
    104   }
    105   llvm_unreachable("unsupported print style");
    106 }
    107 
    108 format_object<uint64_t> MCInstPrinter::formatHex(uint64_t Value) const {
    109   switch(PrintHexStyle) {
    110   case HexStyle::C:
    111      return format("0x%" PRIx64, Value);
    112   case HexStyle::Asm:
    113     if (needsLeadingZero(Value))
    114       return format("0%" PRIx64 "h", Value);
    115     else
    116       return format("%" PRIx64 "h", Value);
    117   }
    118   llvm_unreachable("unsupported print style");
    119 }
    120