blob: 36f4f77d8476525eb4c059256755443b4eee00e5 [file] [log] [blame]
//===- Strings.cpp -------------------------------------------------------===//
// The LLVM Linker
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "lld/Common/Strings.h"
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/LLVM.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/Support/GlobPattern.h"
#include <algorithm>
#include <mutex>
#include <vector>
#if defined(_MSC_VER)
#include <Windows.h>
// DbgHelp.h must be included after Windows.h.
#include <DbgHelp.h>
#pragma comment(lib, "dbghelp.lib")
using namespace llvm;
using namespace lld;
// Returns the demangled C++ symbol name for Name.
Optional<std::string> lld::demangleItanium(StringRef Name) {
// itaniumDemangle can be used to demangle strings other than symbol
// names which do not necessarily start with "_Z". Name can be
// either a C or C++ symbol. Don't call itaniumDemangle if the name
// does not look like a C++ symbol name to avoid getting unexpected
// result for a C symbol that happens to match a mangled type name.
if (!Name.startswith("_Z"))
return None;
char *Buf = itaniumDemangle(Name.str().c_str(), nullptr, nullptr, nullptr);
if (!Buf)
return None;
std::string S(Buf);
return S;
Optional<std::string> lld::demangleMSVC(StringRef S) {
#if defined(_MSC_VER)
// UnDecorateSymbolName is not thread-safe, so we need a mutex.
static std::mutex Mu;
std::lock_guard<std::mutex> Lock(Mu);
char Buf[4096];
if (S.startswith("?"))
if (size_t Len = UnDecorateSymbolName(S.str().c_str(), Buf, sizeof(Buf), 0))
return std::string(Buf, Len);
return None;
StringMatcher::StringMatcher(ArrayRef<StringRef> Pat) {
for (StringRef S : Pat) {
Expected<GlobPattern> Pat = GlobPattern::create(S);
if (!Pat)
bool StringMatcher::match(StringRef S) const {
for (const GlobPattern &Pat : Patterns)
if (Pat.match(S))
return true;
return false;
// Converts a hex string (e.g. "deadbeef") to a vector.
std::vector<uint8_t> lld::parseHex(StringRef S) {
std::vector<uint8_t> Hex;
while (!S.empty()) {
StringRef B = S.substr(0, 2);
S = S.substr(2);
uint8_t H;
if (!to_integer(B, H, 16)) {
error("not a hexadecimal value: " + B);
return {};
return Hex;
// Returns true if S is valid as a C language identifier.
bool lld::isValidCIdentifier(StringRef S) {
return !S.empty() && (isAlpha(S[0]) || S[0] == '_') &&
std::all_of(S.begin() + 1, S.end(),
[](char C) { return C == '_' || isAlnum(C); });
// Write the contents of the a buffer to a file
void lld::saveBuffer(StringRef Buffer, const Twine &Path) {
std::error_code EC;
raw_fd_ostream OS(Path.str(), EC, sys::fs::OpenFlags::F_None);
if (EC)
error("cannot create " + Path + ": " + EC.message());
OS << Buffer;