Strings.cpp
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//===- Strings.cpp -------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt 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/FileSystem.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.
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 demangle 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 std::string(name);
return demangle(std::string(name));
}
SingleStringMatcher::SingleStringMatcher(StringRef Pattern) {
if (Pattern.size() > 2 && Pattern.startswith("\"") &&
Pattern.endswith("\"")) {
ExactMatch = true;
ExactPattern = Pattern.substr(1, Pattern.size() - 2);
} else {
Expected<GlobPattern> Glob = GlobPattern::create(Pattern);
if (!Glob) {
error(toString(Glob.takeError()));
return;
}
ExactMatch = false;
GlobPatternMatcher = *Glob;
}
}
bool SingleStringMatcher::match(StringRef s) const {
return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s);
}
bool StringMatcher::match(StringRef s) const {
for (const SingleStringMatcher &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 {};
}
hex.push_back(h);
}
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::OF_None);
if (ec)
error("cannot create " + path + ": " + ec.message());
os << buffer;
}