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d531bf5b5c
See http://lists.llvm.org/pipermail/llvm-dev/2017-June/113975.html for a related previous discussion. Many tools install signal handlers to print stack traces and optionally symbolize the addresses with an external program 'llvm-symbolizer' (when searching for 'llvm-symbolizer', the directory containg the executable is preferred over PATH). 'llvm-symbolizer' can be slow if the executable is large and/or if llvm-symbolizer' itself is under-optimized. For example, my 'llvm-lto2' from a -DCMAKE_BUILD_TYPE=Debug build is 443MiB. The 'llvm-symbolizer' from the same build takes ~2s to symbolize it. (An optimized 'llvm-symbolizer' takes 0.34s). A crashed clang may take more than 5s to symbolize a stack trace. If a test file has several `not --crash` RUN lines. It can be very slow in a Debug build. This patch makes `not --crash` set an environment variable to suppress symbolization. This is similar to D33804 which uses a command line option. I pick 'symbolization' instead of 'symbolication' because the former is used much more commonly and its stem matches 'llvm-symbolizer'. Also set LLVM_DISABLE_CRASH_REPORT=1, which is currently only applicable on `__APPLE__`. Reviewed By: dblaikie, aganea Differential Revision: https://reviews.llvm.org/D86170
82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
//===- not.cpp - The 'not' testing tool -----------------------------------===//
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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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// Usage:
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// not cmd
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// Will return true if cmd doesn't crash and returns false.
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// not --crash cmd
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// Will return true if cmd crashes (e.g. for testing crash reporting).
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#include "llvm/Support/Program.h"
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#include "llvm/Support/WithColor.h"
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#include "llvm/Support/raw_ostream.h"
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#ifdef _WIN32
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#include <windows.h>
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#endif
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using namespace llvm;
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int main(int argc, const char **argv) {
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bool ExpectCrash = false;
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++argv;
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--argc;
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if (argc > 0 && StringRef(argv[0]) == "--crash") {
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++argv;
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--argc;
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ExpectCrash = true;
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// Crash is expected, so disable crash report and symbolization to reduce
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// output and avoid potentially slow symbolization.
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#ifdef _WIN32
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SetEnvironmentVariableA("LLVM_DISABLE_CRASH_REPORT", "1");
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SetEnvironmentVariableA("LLVM_DISABLE_SYMBOLIZATION", "1");
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#else
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setenv("LLVM_DISABLE_CRASH_REPORT", "1", 0);
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setenv("LLVM_DISABLE_SYMBOLIZATION", "1", 0);
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#endif
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}
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if (argc == 0)
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return 1;
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auto Program = sys::findProgramByName(argv[0]);
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if (!Program) {
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WithColor::error() << "unable to find `" << argv[0]
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<< "' in PATH: " << Program.getError().message() << "\n";
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return 1;
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}
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std::vector<StringRef> Argv;
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Argv.reserve(argc);
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for (int i = 0; i < argc; ++i)
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Argv.push_back(argv[i]);
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std::string ErrMsg;
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int Result = sys::ExecuteAndWait(*Program, Argv, None, {}, 0, 0, &ErrMsg);
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#ifdef _WIN32
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// Handle abort() in msvcrt -- It has exit code as 3. abort(), aka
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// unreachable, should be recognized as a crash. However, some binaries use
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// exit code 3 on non-crash failure paths, so only do this if we expect a
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// crash.
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if (ExpectCrash && Result == 3)
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Result = -3;
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#endif
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if (Result < 0) {
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WithColor::error() << ErrMsg << "\n";
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if (ExpectCrash)
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return 0;
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return 1;
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}
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if (ExpectCrash)
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return 1;
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return Result == 0;
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}
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