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
~MCInstPrinter()19 MCInstPrinter::~MCInstPrinter() {
20 }
21
22 /// getOpcodeName - Return the name of the specified opcode enum (e.g.
23 /// "MOV32ri") or empty if we can't resolve it.
getOpcodeName(unsigned Opcode) const24 StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
25 return MII.getName(Opcode);
26 }
27
printRegName(raw_ostream & OS,unsigned RegNo) const28 void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
29 llvm_unreachable("Target should implement this");
30 }
31
printAnnotation(raw_ostream & OS,StringRef Annot)32 void MCInstPrinter::printAnnotation(raw_ostream &OS, StringRef Annot) {
33 if (!Annot.empty()) {
34 if (CommentStream) {
35 (*CommentStream) << Annot;
36 // By definition (see MCInstPrinter.h), CommentStream must end with
37 // a newline after each comment.
38 if (Annot.back() != '\n')
39 (*CommentStream) << '\n';
40 } else
41 OS << " " << MAI.getCommentString() << " " << Annot;
42 }
43 }
44
45 /// Utility functions to make adding mark ups simpler.
markup(StringRef s) const46 StringRef MCInstPrinter::markup(StringRef s) const {
47 if (getUseMarkup())
48 return s;
49 else
50 return "";
51 }
markup(StringRef a,StringRef b) const52 StringRef MCInstPrinter::markup(StringRef a, StringRef b) const {
53 if (getUseMarkup())
54 return a;
55 else
56 return b;
57 }
58
59 // For asm-style hex (e.g. 0ffh) the first digit always has to be a number.
needsLeadingZero(uint64_t Value)60 static bool needsLeadingZero(uint64_t Value)
61 {
62 while(Value)
63 {
64 uint64_t digit = (Value >> 60) & 0xf;
65 if (digit != 0)
66 return (digit >= 0xa);
67 Value <<= 4;
68 }
69 return false;
70 }
71
formatDec(int64_t Value) const72 format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const {
73 return format("%" PRId64, Value);
74 }
75
formatHex(int64_t Value) const76 format_object<int64_t> MCInstPrinter::formatHex(int64_t Value) const {
77 switch(PrintHexStyle) {
78 case HexStyle::C:
79 if (Value < 0)
80 return format("-0x%" PRIx64, -Value);
81 else
82 return format("0x%" PRIx64, Value);
83 case HexStyle::Asm:
84 if (Value < 0) {
85 if (needsLeadingZero((uint64_t)(-Value)))
86 return format("-0%" PRIx64 "h", -Value);
87 else
88 return format("-%" PRIx64 "h", -Value);
89 } else {
90 if (needsLeadingZero((uint64_t)(Value)))
91 return format("0%" PRIx64 "h", Value);
92 else
93 return format("%" PRIx64 "h", Value);
94 }
95 }
96 llvm_unreachable("unsupported print style");
97 }
98
formatHex(uint64_t Value) const99 format_object<uint64_t> MCInstPrinter::formatHex(uint64_t Value) const {
100 switch(PrintHexStyle) {
101 case HexStyle::C:
102 return format("0x%" PRIx64, Value);
103 case HexStyle::Asm:
104 if (needsLeadingZero(Value))
105 return format("0%" PRIx64 "h", Value);
106 else
107 return format("%" PRIx64 "h", Value);
108 }
109 llvm_unreachable("unsupported print style");
110 }
111