mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-24 08:29:39 +00:00
4564ec9ca7
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93350 91177308-0d34-0410-b5e6-96231b3b80d8
115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
//===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
// Sentinel value for the absolute pseudo section.
|
|
const MCSection *MCSymbol::AbsolutePseudoSection =
|
|
reinterpret_cast<const MCSection *>(1);
|
|
|
|
static bool isAcceptableChar(char C) {
|
|
if ((C < 'a' || C > 'z') &&
|
|
(C < 'A' || C > 'Z') &&
|
|
(C < '0' || C > '9') &&
|
|
C != '_' && C != '$' && C != '.' && C != '@')
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static char HexDigit(int V) {
|
|
return V < 10 ? V+'0' : V+'A'-10;
|
|
}
|
|
|
|
static void MangleLetter(raw_ostream &OS, unsigned char C) {
|
|
OS << '_' << HexDigit(C >> 4) << HexDigit(C & 15) << '_';
|
|
}
|
|
|
|
/// NameNeedsEscaping - Return true if the identifier \arg Str needs quotes
|
|
/// for this assembler.
|
|
static bool NameNeedsEscaping(StringRef Str, const MCAsmInfo &MAI) {
|
|
assert(!Str.empty() && "Cannot create an empty MCSymbol");
|
|
|
|
// If the first character is a number and the target does not allow this, we
|
|
// need quotes.
|
|
if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9')
|
|
return true;
|
|
|
|
// If any of the characters in the string is an unacceptable character, force
|
|
// quotes.
|
|
for (unsigned i = 0, e = Str.size(); i != e; ++i)
|
|
if (!isAcceptableChar(Str[i]))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/// printMangledName - Print the specified string in mangled form if it uses
|
|
/// any unusual characters.
|
|
void MCSymbol::printMangledName(StringRef Str, raw_ostream &OS,
|
|
const MCAsmInfo *MAI) {
|
|
// The first character is not allowed to be a number unless the target
|
|
// explicitly allows it.
|
|
if ((MAI == 0 || !MAI->doesAllowNameToStartWithDigit()) &&
|
|
Str[0] >= '0' && Str[0] <= '9') {
|
|
MangleLetter(OS, Str[0]);
|
|
Str = Str.substr(1);
|
|
}
|
|
|
|
for (unsigned i = 0, e = Str.size(); i != e; ++i) {
|
|
if (!isAcceptableChar(Str[i]))
|
|
MangleLetter(OS, Str[i]);
|
|
else
|
|
OS << Str[i];
|
|
}
|
|
}
|
|
|
|
/// PrintMangledQuotedName - On systems that support quoted symbols, we still
|
|
/// have to escape some (obscure) characters like " and \n which would break the
|
|
/// assembler's lexing.
|
|
static void PrintMangledQuotedName(raw_ostream &OS, StringRef Str) {
|
|
OS << '"';
|
|
|
|
for (unsigned i = 0, e = Str.size(); i != e; ++i) {
|
|
if (Str[i] == '"')
|
|
OS << "_QQ_";
|
|
else if (Str[i] == '\n')
|
|
OS << "_NL_";
|
|
else
|
|
OS << Str[i];
|
|
}
|
|
OS << '"';
|
|
}
|
|
|
|
|
|
void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
|
|
if (MAI == 0 || !NameNeedsEscaping(getName(), *MAI)) {
|
|
OS << getName();
|
|
return;
|
|
}
|
|
|
|
// On systems that do not allow quoted names, print with mangling.
|
|
if (!MAI->doesAllowQuotesInName())
|
|
return printMangledName(getName(), OS, MAI);
|
|
|
|
// If the string contains a double quote or newline, we still have to mangle
|
|
// it.
|
|
if (getName().find('"') != std::string::npos ||
|
|
getName().find('\n') != std::string::npos)
|
|
return PrintMangledQuotedName(OS, getName());
|
|
|
|
OS << '"' << getName() << '"';
|
|
}
|
|
|
|
void MCSymbol::dump() const {
|
|
print(dbgs(), 0);
|
|
}
|