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//===- ErrorHandler.cpp ---------------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/Threads.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/raw_ostream.h"
#include <mutex>
#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 the output buffer so that any tempory file is deleted.
errorHandler().OutputBuffer.reset();
// 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 ErrorHandler::print(StringRef S, raw_ostream::Colors C) {
*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);
print("warning: ", raw_ostream::MAGENTA);
*ErrorOS << Msg << "\n";
}
void ErrorHandler::error(const Twine &Msg) {
std::lock_guard<std::mutex> Lock(Mu);
newline(ErrorOS, Msg);
if (ErrorLimit == 0 || ErrorCount < ErrorLimit) {
print("error: ", raw_ostream::RED);
*ErrorOS << Msg << "\n";
} else if (ErrorCount == ErrorLimit) {
print("error: ", raw_ostream::RED);
*ErrorOS << ErrorLimitExceededMsg << "\n";
if (ExitEarly)
exitLld(1);
}
++ErrorCount;
}
void ErrorHandler::fatal(const Twine &Msg) {
error(Msg);
exitLld(1);
}
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