mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-30 17:33:24 +00:00
db9835d089
This moves most of the isUsed logic to the MCSymbol itself. With this we get a bit more relaxed about allowing definitions after uses: uses that don't evaluate their argument immediately (jmp foo) are accepted. ddunbar, this was the smallest compromise I could think of that lets us accept gcc (and clang!) assembly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119144 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
2.1 KiB
C++
69 lines
2.1 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/MCExpr.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;
|
|
}
|
|
|
|
/// NameNeedsQuoting - Return true if the identifier \arg Str needs quotes to be
|
|
/// syntactically correct.
|
|
static bool NameNeedsQuoting(StringRef Str) {
|
|
assert(!Str.empty() && "Cannot create an empty MCSymbol");
|
|
|
|
// 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;
|
|
}
|
|
|
|
void MCSymbol::setVariableValue(const MCExpr *Value) {
|
|
assert(!IsUsed && "Cannot set a variable that has already been used.");
|
|
assert(Value && "Invalid variable value!");
|
|
assert((isUndefined() || (isAbsolute() && isa<MCConstantExpr>(Value))) &&
|
|
"Invalid redefinition!");
|
|
this->Value = Value;
|
|
|
|
// Mark the variable as absolute as appropriate.
|
|
if (isa<MCConstantExpr>(Value))
|
|
setAbsolute();
|
|
}
|
|
|
|
void MCSymbol::print(raw_ostream &OS) const {
|
|
// The name for this MCSymbol is required to be a valid target name. However,
|
|
// some targets support quoting names with funny characters. If the name
|
|
// contains a funny character, then print it quoted.
|
|
if (!NameNeedsQuoting(getName())) {
|
|
OS << getName();
|
|
return;
|
|
}
|
|
|
|
OS << '"' << getName() << '"';
|
|
}
|
|
|
|
void MCSymbol::dump() const {
|
|
print(dbgs());
|
|
}
|