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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;
// We want to separate multi-line messages with a newline. `sep` is "\n"
// if the last messages was multi-line. Otherwise "".
static StringRef sep;
static StringRef getSeparator(const Twine &msg) {
if (StringRef(msg.str()).contains('\n'))
return "\n";
return "";
}
ErrorHandler &lld::errorHandler() {
static ErrorHandler handler;
return handler;
}
void lld::enableColors(bool enable) {
errorHandler().errorOS->enable_colors(enable);
}
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()); });
}
// This is for --vs-diagnostics.
//
// Normally, lld's error message starts with argv[0]. Therefore, it usually
// looks like this:
//
// ld.lld: error: ...
//
// This error message style is unfortunately unfriendly to Visual Studio
// IDE. VS interprets the first word of the first line as an error location
// and make it clickable, thus "ld.lld" in the above message would become a
// clickable text. When you click it, VS opens "ld.lld" executable file with
// a binary editor.
//
// As a workaround, we print out an error location instead of "ld.lld" if
// lld is running in VS diagnostics mode. As a result, error message will
// look like this:
//
// src/foo.c(35): error: ...
//
// This function returns an error location string. An error location is
// extracted from an error message using regexps.
std::string ErrorHandler::getLocation(const Twine &msg) {
if (!vsDiagnostics)
return logName;
static std::regex regexes[] = {
std::regex(
R"(^undefined (?:\S+ )?symbol:.*\n)"
R"(>>> referenced by .+\((\S+):(\d+)\))"),
std::regex(
R"(^undefined (?:\S+ )?symbol:.*\n>>> referenced by (\S+):(\d+))"),
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"(^duplicate symbol: .*\n>>> defined at (\S+):(\d+))"),
std::regex(
R"(.*\n>>> defined in .*\n>>> referenced by .+\((\S+):(\d+)\))"),
std::regex(R"(.*\n>>> defined in .*\n>>> referenced by (\S+):(\d+))"),
std::regex(R"((\S+):(\d+): unclosed quote)"),
};
std::string str = msg.str();
for (std::regex &re : regexes) {
std::smatch m;
if (!std::regex_search(str, m, re))
continue;
assert(m.size() == 2 || m.size() == 3);
if (m.size() == 2)
return m.str(1);
return m.str(1) + "(" + m.str(2) + ")";
}
return logName;
}
void ErrorHandler::log(const Twine &msg) {
if (!verbose)
return;
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);
*errorOS << sep << getLocation(msg) << ": " << Colors::MAGENTA
<< "warning: " << Colors::RESET << msg << "\n";
sep = getSeparator(msg);
}
void ErrorHandler::error(const Twine &msg) {
// If Visual Studio-style error message mode is enabled,
// this particular error is printed out as two errors.
if (vsDiagnostics) {
static std::regex re(R"(^(duplicate symbol: .*))"
R"((\n>>> defined at \S+:\d+.*\n>>>.*))"
R"((\n>>> defined at \S+:\d+.*\n>>>.*))");
std::string str = msg.str();
std::smatch m;
if (std::regex_match(str, m, re)) {
error(m.str(1) + m.str(2));
error(m.str(1) + m.str(3));
return;
}
}
std::lock_guard<std::mutex> lock(mu);
if (errorLimit == 0 || errorCount < errorLimit) {
*errorOS << sep << getLocation(msg) << ": " << Colors::RED
<< "error: " << Colors::RESET << msg << "\n";
} else if (errorCount == errorLimit) {
*errorOS << sep << getLocation(msg) << ": " << Colors::RED
<< "error: " << Colors::RESET << errorLimitExceededMsg << "\n";
if (exitEarly)
exitLld(1);
}
sep = getSeparator(msg);
++errorCount;
}
void ErrorHandler::fatal(const Twine &msg) {
error(msg);
exitLld(1);
}
|