blob: 0bf06626cc7a9bbca27ed71e865f64c1aae504d9 [file] [log] [blame]
//===- Strings.cpp -------------------------------------------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#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>
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 name) {
std::string prefix;
if (name.consume_front("__imp_"))
prefix = "__declspec(dllimport) ";
// Demangle only C++ names.
if (!name.startswith("?"))
return None;
char *buf = microsoftDemangle(name.str().c_str(), nullptr, nullptr, nullptr);
if (!buf)
return None;
std::string s(buf);
return prefix + s;
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;