Mercurial > hg > Members > tobaru > cbc > CbC_llvm

comparison lib/MC/MCSymbol.cpp @ 0:95c75e76d11b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children afa8332a0e37
comparison
equal deleted inserted replaced
-1:000000000000 0:95c75e76d11b
1 //===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//
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/MCSymbol.h"
11 #include "llvm/MC/MCExpr.h"
12 #include "llvm/Support/Debug.h"
13 #include "llvm/Support/raw_ostream.h"
14 using namespace llvm;
15
16 // Sentinel value for the absolute pseudo section.
17 const MCSection *MCSymbol::AbsolutePseudoSection =
18 reinterpret_cast<const MCSection *>(1);
19
20 static bool isAcceptableChar(char C) {
21 if ((C < 'a' || C > 'z') &&
22 (C < 'A' || C > 'Z') &&
23 (C < '0' || C > '9') &&
24 C != '_' && C != '$' && C != '.' && C != '@')
25 return false;
26 return true;
27 }
28
29 /// NameNeedsQuoting - Return true if the identifier \p Str needs quotes to be
30 /// syntactically correct.
31 static bool NameNeedsQuoting(StringRef Str) {
32 assert(!Str.empty() && "Cannot create an empty MCSymbol");
33
34 // If any of the characters in the string is an unacceptable character, force
35 // quotes.
36 for (unsigned i = 0, e = Str.size(); i != e; ++i)
37 if (!isAcceptableChar(Str[i]))
38 return true;
39 return false;
40 }
41
42 const MCSymbol &MCSymbol::AliasedSymbol() const {
43 const MCSymbol *S = this;
44 while (S->isVariable()) {
45 const MCExpr *Value = S->getVariableValue();
46 if (Value->getKind() != MCExpr::SymbolRef)
47 return *S;
48 const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value);
49 S = &Ref->getSymbol();
50 }
51 return *S;
52 }
53
54 void MCSymbol::setVariableValue(const MCExpr *Value) {
55 assert(!IsUsed && "Cannot set a variable that has already been used.");
56 assert(Value && "Invalid variable value!");
57 this->Value = Value;
58
59 // Variables should always be marked as in the same "section" as the value.
60 const MCSection *Section = Value->FindAssociatedSection();
61 if (Section)
62 setSection(*Section);
63 else
64 setUndefined();
65 }
66
67 void MCSymbol::print(raw_ostream &OS) const {
68 // The name for this MCSymbol is required to be a valid target name. However,
69 // some targets support quoting names with funny characters. If the name
70 // contains a funny character, then print it quoted.
71 StringRef Name = getName();
72 if (!NameNeedsQuoting(Name)) {
73 OS << Name;
74 return;
75 }
76
77 OS << '"';
78 for (unsigned I = 0, E = Name.size(); I != E; ++I) {
79 char C = Name[I];
80 if (C == '\n')
81 OS << "\\n";
82 else if (C == '"')
83 OS << "\\\"";
84 else
85 OS << C;
86 }
87 OS << '"';
88 }
89
90 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
91 void MCSymbol::dump() const {
92 print(dbgs());
93 }
94 #endif