1 //===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCSymbol.h"
11 #include "llvm/MC/MCAsmInfo.h"
12 #include "llvm/Support/raw_ostream.h"
15 // Sentinel value for the absolute pseudo section.
16 const MCSection *MCSymbol::AbsolutePseudoSection =
17 reinterpret_cast<const MCSection *>(1);
19 static bool isAcceptableChar(char C) {
20 if ((C < 'a' || C > 'z') &&
21 (C < 'A' || C > 'Z') &&
22 (C < '0' || C > '9') &&
23 C != '_' && C != '$' && C != '.' && C != '@')
28 static char HexDigit(int V) {
29 return V < 10 ? V+'0' : V+'A'-10;
32 static void MangleLetter(raw_ostream &OS, unsigned char C) {
33 OS << '_' << HexDigit(C >> 4) << HexDigit(C & 15) << '_';
36 /// NameNeedsEscaping - Return true if the identifier \arg Str needs quotes
37 /// for this assembler.
38 static bool NameNeedsEscaping(const StringRef &Str, const MCAsmInfo &MAI) {
39 assert(!Str.empty() && "Cannot create an empty MCSymbol");
41 // If the first character is a number and the target does not allow this, we
43 if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9')
46 // If any of the characters in the string is an unacceptable character, force
48 for (unsigned i = 0, e = Str.size(); i != e; ++i)
49 if (!isAcceptableChar(Str[i]))
54 static void PrintMangledName(raw_ostream &OS, StringRef Str,
55 const MCAsmInfo &MAI) {
56 // The first character is not allowed to be a number unless the target
57 // explicitly allows it.
58 if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9') {
59 MangleLetter(OS, Str[0]);
63 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
64 if (!isAcceptableChar(Str[i]))
65 MangleLetter(OS, Str[i]);
71 /// PrintMangledQuotedName - On systems that support quoted symbols, we still
72 /// have to escape some (obscure) characters like " and \n which would break the
73 /// assembler's lexing.
74 static void PrintMangledQuotedName(raw_ostream &OS, StringRef Str) {
77 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
80 else if (Str[i] == '\n')
89 void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
90 if (MAI == 0 || !NameNeedsEscaping(getName(), *MAI)) {
95 // On systems that do not allow quoted names, print with mangling.
96 if (!MAI->doesAllowQuotesInName())
97 return PrintMangledName(OS, getName(), *MAI);
99 // If the string contains a double quote or newline, we still have to mangle
101 if (getName().find('"') != std::string::npos ||
102 getName().find('\n') != std::string::npos)
103 return PrintMangledQuotedName(OS, getName());
105 OS << '"' << getName() << '"';
108 void MCSymbol::dump() const {