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, we need quotes.
42 if (Str[0] >= '0' && Str[0] <= '9')
45 // If any of the characters in the string is an unacceptable character, force
47 for (unsigned i = 0, e = Str.size(); i != e; ++i)
48 if (!isAcceptableChar(Str[i]))
53 static void PrintMangledName(raw_ostream &OS, StringRef Str) {
54 // The first character is not allowed to be a number.
55 if (Str[0] >= '0' && Str[0] <= '9') {
56 MangleLetter(OS, Str[0]);
60 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
61 if (!isAcceptableChar(Str[i]))
62 MangleLetter(OS, Str[i]);
69 void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
70 if (MAI == 0 || !NameNeedsEscaping(getName(), *MAI)) {
75 // On darwin and other systems that allow quoted names, just do that.
76 if (MAI->doesAllowQuotesInName()) {
77 OS << '"' << getName() << '"';
81 // Otherwise, we have to mangle the name.
82 PrintMangledName(OS, getName());
85 void MCSymbol::dump() const {