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https://github.com/c64scene-ar/llvm-6502.git
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b74b88edac
The reason this got reverted was that the @feat.00 symbol which was emitted for every TU became quoted, and on cygwin/mingw we use the gas assembler which couldn't handle the quotes. This commit fixes the problem by only emitting @feat.00 for win32, where we use clang -cc1as to assemble. gas would just drop this symbol anyway, so there is no loss there. With @feat.00 gone, there shouldn't be quoted symbols showing up on cygwin since it uses the Itanium ABI, which doesn't put these funny characters in symbols. > Because of win32 mangling, we produce symbol and section names with > funny characters in them, most notably @ characters. > > MC would choke on trying to parse its own assembly output. This patch addresses > that by: > > - Making @ trigger quoting of symbol names > - Also quote section names in the same way > - Just parse section names like other identifiers (to allow for quotes) > - Don't assume @ signifies a symbol variant if it is in a string. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192859 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
2.4 KiB
C++
82 lines
2.4 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/MCExpr.h"
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#include "llvm/Support/Debug.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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return (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 == '.';
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}
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/// NameNeedsQuoting - Return true if the identifier \p Str needs quotes to be
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/// syntactically correct.
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static bool NameNeedsQuoting(StringRef Str) {
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assert(!Str.empty() && "Cannot create an empty MCSymbol");
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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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const MCSymbol &MCSymbol::AliasedSymbol() const {
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const MCSymbol *S = this;
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while (S->isVariable()) {
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const MCExpr *Value = S->getVariableValue();
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if (Value->getKind() != MCExpr::SymbolRef)
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return *S;
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const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value);
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S = &Ref->getSymbol();
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}
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return *S;
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}
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void MCSymbol::setVariableValue(const MCExpr *Value) {
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assert(!IsUsed && "Cannot set a variable that has already been used.");
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assert(Value && "Invalid variable value!");
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this->Value = Value;
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// Variables should always be marked as in the same "section" as the value.
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const MCSection *Section = Value->FindAssociatedSection();
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if (Section)
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setSection(*Section);
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else
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setUndefined();
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}
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void MCSymbol::print(raw_ostream &OS) const {
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// The name for this MCSymbol is required to be a valid target name. However,
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// some targets support quoting names with funny characters. If the name
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// contains a funny character, then print it quoted.
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if (!NameNeedsQuoting(getName())) {
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OS << getName();
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return;
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}
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OS << '"' << getName() << '"';
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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void MCSymbol::dump() const {
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print(dbgs());
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}
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#endif
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