forked from OSchip/llvm-project
111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
//===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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// Sentinel value for the absolute pseudo section.
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const MCSection *MCSymbol::AbsolutePseudoSection =
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reinterpret_cast<const MCSection *>(1);
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static bool isAcceptableChar(char C) {
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if ((C < 'a' || C > 'z') &&
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(C < 'A' || C > 'Z') &&
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(C < '0' || C > '9') &&
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C != '_' && C != '$' && C != '.' && C != '@')
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return false;
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return true;
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}
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static char HexDigit(int V) {
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return V < 10 ? V+'0' : V+'A'-10;
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}
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static void MangleLetter(raw_ostream &OS, unsigned char C) {
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OS << '_' << HexDigit(C >> 4) << HexDigit(C & 15) << '_';
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}
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/// NameNeedsEscaping - Return true if the identifier \arg Str needs quotes
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/// for this assembler.
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static bool NameNeedsEscaping(const StringRef &Str, const MCAsmInfo &MAI) {
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assert(!Str.empty() && "Cannot create an empty MCSymbol");
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// If the first character is a number and the target does not allow this, we
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// need quotes.
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if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9')
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return true;
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// If any of the characters in the string is an unacceptable character, force
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// quotes.
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for (unsigned i = 0, e = Str.size(); i != e; ++i)
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if (!isAcceptableChar(Str[i]))
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return true;
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return false;
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}
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static void PrintMangledName(raw_ostream &OS, StringRef Str,
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const MCAsmInfo &MAI) {
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// The first character is not allowed to be a number unless the target
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// explicitly allows it.
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if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9') {
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MangleLetter(OS, Str[0]);
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Str = Str.substr(1);
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}
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for (unsigned i = 0, e = Str.size(); i != e; ++i) {
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if (!isAcceptableChar(Str[i]))
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MangleLetter(OS, Str[i]);
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else
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OS << Str[i];
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}
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}
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/// PrintMangledQuotedName - On systems that support quoted symbols, we still
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/// have to escape some (obscure) characters like " and \n which would break the
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/// assembler's lexing.
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static void PrintMangledQuotedName(raw_ostream &OS, StringRef Str) {
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OS << '"';
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for (unsigned i = 0, e = Str.size(); i != e; ++i) {
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if (Str[i] == '"')
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OS << "_QQ_";
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else if (Str[i] == '\n')
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OS << "_NL_";
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else
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OS << Str[i];
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}
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OS << '"';
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}
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void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
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if (MAI == 0 || !NameNeedsEscaping(getName(), *MAI)) {
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OS << getName();
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return;
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}
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// On systems that do not allow quoted names, print with mangling.
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if (!MAI->doesAllowQuotesInName())
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return PrintMangledName(OS, getName(), *MAI);
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// If the string contains a double quote or newline, we still have to mangle
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// it.
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if (getName().find('"') != std::string::npos ||
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getName().find('\n') != std::string::npos)
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return PrintMangledQuotedName(OS, getName());
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OS << '"' << getName() << '"';
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}
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void MCSymbol::dump() const {
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print(errs(), 0);
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}
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