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//===- ErrorHandler.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/ErrorHandler.h"
#include "lld/Common/Threads.h"
#include "llvm/ADT/Twine.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/raw_ostream.h"
#include <mutex>
#include <regex>
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#endif
using namespace llvm;
using namespace lld;
// The functions defined in this file can be called from multiple threads,
// but outs() or errs() are not thread-safe. We protect them using a mutex.
static std::mutex mu;
// Prints "\n" or does nothing, depending on Msg contents of
// the previous call of this function.
static void newline(raw_ostream *errorOS, const Twine &msg) {
// True if the previous error message contained "\n".
// We want to separate multi-line error messages with a newline.
static bool flag;
if (flag)
*errorOS << "\n";
flag = StringRef(msg.str()).contains('\n');
}
ErrorHandler &lld::errorHandler() {
static ErrorHandler handler;
return handler;
}
void lld::exitLld(int val) {
// Delete any temporary file, while keeping the memory mapping open.
if (errorHandler().outputBuffer)
errorHandler().outputBuffer->discard();
// Dealloc/destroy ManagedStatic variables before calling
// _exit(). In a non-LTO build, this is a nop. In an LTO
// build allows us to get the output of -time-passes.
llvm_shutdown();
outs().flush();
errs().flush();
_exit(val);
}
void lld::diagnosticHandler(const DiagnosticInfo &di) {
SmallString<128> s;
raw_svector_ostream os(s);
DiagnosticPrinterRawOStream dp(os);
di.print(dp);
switch (di.getSeverity()) {
case DS_Error:
error(s);
break;
case DS_Warning:
warn(s);
break;
case DS_Remark:
case DS_Note:
message(s);
break;
}
}
void lld::checkError(Error e) {
handleAllErrors(std::move(e),
[&](ErrorInfoBase &eib) { error(eib.message()); });
}
static std::string getLocation(std::string msg, std::string defaultMsg) {
static std::vector<std::regex> Regexes{
std::regex(R"(^undefined (?:\S+ )?symbol:.*\n>>> referenced by (\S+):(\d+)\n.*)"),
std::regex(R"(^undefined symbol:.*\n>>> referenced by (.*):)"),
std::regex(
R"(^duplicate symbol: .*\n>>> defined in (\S+)\n>>> defined in.*)"),
std::regex(
R"(^duplicate symbol: .*\n>>> defined at (\S+):(\d+).*)"),
std::regex(
R"(.*\n>>> defined in .*\n>>> referenced by (\S+):(\d+))"),
std::regex(R"((\S+):(\d+): unclosed quote)"),
};
std::smatch Match;
for (std::regex &Re : Regexes) {
if (std::regex_search(msg, Match, Re)) {
return Match.size() > 2 ? Match.str(1) + "(" + Match.str(2) + ")"
: Match.str(1);
}
}
return defaultMsg;
}
void ErrorHandler::printHeader(StringRef s, raw_ostream::Colors c,
const Twine &msg) {
if (vsDiagnostics) {
// A Visual Studio-style error message starts with an error location.
// If a location cannot be extracted then we default to LogName.
*errorOS << getLocation(msg.str(), logName) << ": ";
} else {
*errorOS << logName << ": ";
}
if (colorDiagnostics) {
errorOS->changeColor(c, true);
*errorOS << s;
errorOS->resetColor();
} else {
*errorOS << s;
}
}
void ErrorHandler::log(const Twine &msg) {
if (verbose) {
std::lock_guard<std::mutex> lock(mu);
*errorOS << logName << ": " << msg << "\n";
}
}
void ErrorHandler::message(const Twine &msg) {
std::lock_guard<std::mutex> lock(mu);
outs() << msg << "\n";
outs().flush();
}
void ErrorHandler::warn(const Twine &msg) {
if (fatalWarnings) {
error(msg);
return;
}
std::lock_guard<std::mutex> lock(mu);
newline(errorOS, msg);
printHeader("warning: ", raw_ostream::MAGENTA, msg);
*errorOS << msg << "\n";
}
void ErrorHandler::error(const Twine &msg) {
std::lock_guard<std::mutex> lock(mu);
if (errorLimit == 0 || errorCount < errorLimit) {
newline(errorOS, msg);
printHeader("error: ", raw_ostream::RED, msg);
*errorOS << msg << "\n";
} else if (errorCount == errorLimit) {
newline(errorOS, msg);
printHeader("error: ", raw_ostream::RED, msg);
*errorOS << errorLimitExceededMsg << "\n";
if (exitEarly)
exitLld(1);
}
++errorCount;
}
void ErrorHandler::fatal(const Twine &msg) {
error(msg);
exitLld(1);
}
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