blob: 29760b492ba98d70103a35a63d20c04dfa4326d5 [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 "Strings.h"
#include "Config.h"
#include "Error.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Demangle/Demangle.h"
#include <algorithm>
#include <cstring>
using namespace llvm;
using namespace lld;
using namespace lld::elf;
StringMatcher::StringMatcher(ArrayRef<StringRef> Pat) {
for (StringRef S : Pat) {
Expected<GlobPattern> Pat = GlobPattern::create(S);
if (!Pat)
error(toString(Pat.takeError()));
else
Patterns.push_back(*Pat);
}
}
bool StringMatcher::match(StringRef S) const {
for (const GlobPattern &Pat : Patterns)
if (Pat.match(S))
return true;
return false;
}
// If an input string is in the form of "foo.N" where N is a number,
// return N. Otherwise, returns 65536, which is one greater than the
// lowest priority.
int elf::getPriority(StringRef S) {
size_t Pos = S.rfind('.');
if (Pos == StringRef::npos)
return 65536;
int V;
if (S.substr(Pos + 1).getAsInteger(10, V))
return 65536;
return V;
}
bool elf::hasWildcard(StringRef S) {
return S.find_first_of("?*[") != StringRef::npos;
}
StringRef elf::unquote(StringRef S) {
if (!S.startswith("\""))
return S;
return S.substr(1, S.size() - 2);
}
// Converts a hex string (e.g. "deadbeef") to a vector.
std::vector<uint8_t> elf::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 (B.getAsInteger(16, H)) {
error("not a hexadecimal value: " + B);
return {};
}
Hex.push_back(H);
}
return Hex;
}
static bool isAlpha(char C) {
return ('a' <= C && C <= 'z') || ('A' <= C && C <= 'Z') || C == '_';
}
static bool isAlnum(char C) { return isAlpha(C) || ('0' <= C && C <= '9'); }
// Returns true if S is valid as a C language identifier.
bool elf::isValidCIdentifier(StringRef S) {
return !S.empty() && isAlpha(S[0]) &&
std::all_of(S.begin() + 1, S.end(), isAlnum);
}
// Returns the demangled C++ symbol name for Name.
Optional<std::string> elf::demangle(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);
free(Buf);
return S;
}