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author | rdivacky <rdivacky@FreeBSD.org> | 2009-10-14 17:57:32 +0000 |
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committer | rdivacky <rdivacky@FreeBSD.org> | 2009-10-14 17:57:32 +0000 |
commit | cd749a9c07f1de2fb8affde90537efa4bc3e7c54 (patch) | |
tree | b21f6de4e08b89bb7931806bab798fc2a5e3a686 /lib/MC/MCSymbol.cpp | |
parent | 72621d11de5b873f1695f391eb95f0b336c3d2d4 (diff) | |
download | FreeBSD-src-cd749a9c07f1de2fb8affde90537efa4bc3e7c54.zip FreeBSD-src-cd749a9c07f1de2fb8affde90537efa4bc3e7c54.tar.gz |
Update llvm to r84119.
Diffstat (limited to 'lib/MC/MCSymbol.cpp')
-rw-r--r-- | lib/MC/MCSymbol.cpp | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/lib/MC/MCSymbol.cpp b/lib/MC/MCSymbol.cpp new file mode 100644 index 0000000..86ff3f3 --- /dev/null +++ b/lib/MC/MCSymbol.cpp @@ -0,0 +1,110 @@ +//===- 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/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(const 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; +} + +static void PrintMangledName(raw_ostream &OS, StringRef Str, + const MCAsmInfo &MAI) { + // The first character is not allowed to be a number unless the target + // explicitly allows it. + if (!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(OS, getName(), *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(errs(), 0); +} |