1 //===- MCInstPrinter.cpp - Convert an MCInst to target assembly syntax ----===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/MC/MCInstPrinter.h" 10 #include "llvm/ADT/ArrayRef.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 #include <cinttypes> 18 #include <cstdint> 19 20 using namespace llvm; 21 22 void llvm::dumpBytes(ArrayRef<uint8_t> bytes, raw_ostream &OS) { 23 static const char hex_rep[] = "0123456789abcdef"; 24 bool First = true; 25 for (char i: bytes) { 26 if (First) 27 First = false; 28 else 29 OS << ' '; 30 OS << hex_rep[(i & 0xF0) >> 4]; 31 OS << hex_rep[i & 0xF]; 32 } 33 } 34 35 MCInstPrinter::~MCInstPrinter() = default; 36 37 /// getOpcodeName - Return the name of the specified opcode enum (e.g. 38 /// "MOV32ri") or empty if we can't resolve it. 39 StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const { 40 return MII.getName(Opcode); 41 } 42 43 void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const { 44 llvm_unreachable("Target should implement this"); 45 } 46 47 void MCInstPrinter::printAnnotation(raw_ostream &OS, StringRef Annot) { 48 if (!Annot.empty()) { 49 if (CommentStream) { 50 (*CommentStream) << Annot; 51 // By definition (see MCInstPrinter.h), CommentStream must end with 52 // a newline after each comment. 53 if (Annot.back() != '\n') 54 (*CommentStream) << '\n'; 55 } else 56 OS << " " << MAI.getCommentString() << " " << Annot; 57 } 58 } 59 60 /// Utility functions to make adding mark ups simpler. 61 StringRef MCInstPrinter::markup(StringRef s) const { 62 if (getUseMarkup()) 63 return s; 64 else 65 return ""; 66 } 67 StringRef MCInstPrinter::markup(StringRef a, StringRef b) const { 68 if (getUseMarkup()) 69 return a; 70 else 71 return b; 72 } 73 74 // For asm-style hex (e.g. 0ffh) the first digit always has to be a number. 75 static bool needsLeadingZero(uint64_t Value) 76 { 77 while (Value) 78 { 79 uint64_t digit = (Value >> 60) & 0xf; 80 if (digit != 0) 81 return (digit >= 0xa); 82 Value <<= 4; 83 } 84 return false; 85 } 86 87 format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const { 88 return format("%" PRId64, Value); 89 } 90 91 format_object<int64_t> MCInstPrinter::formatHex(int64_t Value) const { 92 switch(PrintHexStyle) { 93 case HexStyle::C: 94 if (Value < 0) 95 return format("-0x%" PRIx64, -Value); 96 else 97 return format("0x%" PRIx64, Value); 98 case HexStyle::Asm: 99 if (Value < 0) { 100 if (needsLeadingZero((uint64_t)(-Value))) 101 return format("-0%" PRIx64 "h", -Value); 102 else 103 return format("-%" PRIx64 "h", -Value); 104 } else { 105 if (needsLeadingZero((uint64_t)(Value))) 106 return format("0%" PRIx64 "h", Value); 107 else 108 return format("%" PRIx64 "h", Value); 109 } 110 } 111 llvm_unreachable("unsupported print style"); 112 } 113 114 format_object<uint64_t> MCInstPrinter::formatHex(uint64_t Value) const { 115 switch(PrintHexStyle) { 116 case HexStyle::C: 117 return format("0x%" PRIx64, Value); 118 case HexStyle::Asm: 119 if (needsLeadingZero(Value)) 120 return format("0%" PRIx64 "h", Value); 121 else 122 return format("%" PRIx64 "h", Value); 123 } 124 llvm_unreachable("unsupported print style"); 125 } 126