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3533461f4c
The pipe signal handler must be installed before any other handlers are registered. This is because the Unix RegisterHandlers function does not perform a sigaction() for SIGPIPE unless a one-shot handler is present, to allow long-lived processes (like lldb) to fully opt-out of llvm's SIGPIPE handling and ignore the signal safely. Fixes a bug introduced in D70277. Tested by running Nick's test case: % xcrun ./bin/clang -E -fno-integrated-cc1 x.c | tee foo.txt | head I verified that child cc1 process exits with IO_ERR, and that the parent recognizes the error code, exiting cleanly. Differential Revision: https://reviews.llvm.org/D94324
64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
//===-- InitLLVM.cpp -----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/Signals.h"
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#include <string>
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#ifdef _WIN32
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#include "llvm/Support/Windows/WindowsSupport.h"
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#endif
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using namespace llvm;
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using namespace llvm::sys;
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InitLLVM::InitLLVM(int &Argc, const char **&Argv,
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bool InstallPipeSignalExitHandler) {
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if (InstallPipeSignalExitHandler)
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// The pipe signal handler must be installed before any other handlers are
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// registered. This is because the Unix \ref RegisterHandlers function does
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// not perform a sigaction() for SIGPIPE unless a one-shot handler is
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// present, to allow long-lived processes (like lldb) to fully opt-out of
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// llvm's SIGPIPE handling and ignore the signal safely.
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sys::SetOneShotPipeSignalFunction(sys::DefaultOneShotPipeSignalHandler);
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// Initialize the stack printer after installing the one-shot pipe signal
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// handler, so we can perform a sigaction() for SIGPIPE on Unix if requested.
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StackPrinter.emplace(Argc, Argv);
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sys::PrintStackTraceOnErrorSignal(Argv[0]);
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install_out_of_memory_new_handler();
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#ifdef _WIN32
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// We use UTF-8 as the internal character encoding. On Windows,
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// arguments passed to main() may not be encoded in UTF-8. In order
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// to reliably detect encoding of command line arguments, we use an
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// Windows API to obtain arguments, convert them to UTF-8, and then
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// write them back to the Argv vector.
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//
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// There's probably other way to do the same thing (e.g. using
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// wmain() instead of main()), but this way seems less intrusive
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// than that.
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std::string Banner = std::string(Argv[0]) + ": ";
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ExitOnError ExitOnErr(Banner);
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ExitOnErr(errorCodeToError(windows::GetCommandLineArguments(Args, Alloc)));
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// GetCommandLineArguments doesn't terminate the vector with a
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// nullptr. Do it to make it compatible with the real argv.
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Args.push_back(nullptr);
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Argc = Args.size() - 1;
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Argv = Args.data();
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#endif
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}
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InitLLVM::~InitLLVM() { llvm_shutdown(); }
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