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/*
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(LLVM_PROFILE_GENERATION)
#include "FileSystem.h"
#include "MonotonicTime.h"
#include "text/WTFString.h"
#include <notify.h>
#include <unistd.h>
extern "C" int __llvm_profile_write_file(void);
extern "C" void __llvm_profile_set_filename(const char*);
extern "C" void __llvm_profile_reset_counters(void);
#endif
namespace WTF {
template<typename OnceFlagDiversifier>
ALWAYS_INLINE void registerProfileGenerationCallback(const char* name)
{
#if ENABLE(LLVM_PROFILE_GENERATION)
constexpr int WRITE_SUCCESS = 0;
static int profileCount = 0;
static NeverDestroyed<String> profileFileBase;
static NeverDestroyed<String> profileFileName;
static std::once_flag registerFlag;
std::call_once(registerFlag, [name] {
int pid = getpid();
WTFLogAlways("<WEBKIT_LLVM_PROFILE><%s><%d>: Registering callback for profile data.", name, pid);
WTFLogAlways("<WEBKIT_LLVM_PROFILE> To collect a profile: `notifyutil -p com.apple.WebKit.profiledata`");
WTFLogAlways("<WEBKIT_LLVM_PROFILE> To copy the output: `"
R"HERE(log stream --style json --color none | perl -mFile::Basename -mFile::Copy -nle 'if (m/<WEBKIT_LLVM_PROFILE>.*<BEGIN>(.*)<END>/) { (my $l = $1) =~ s/\\\//\//g; my $b = File::Basename::basename($l); my $d = "./profiles/$b"; print "Moving $l to $d"; File::Copy::move($l, $d); }')HERE"
"`.");
WTFLogAlways("<WEBKIT_LLVM_PROFILE> To sanity-check the output: `for f in ./profiles/*; do echo $f; xcrun -sdk macosx.internal llvm-profdata show $f; done;`.");
WTFLogAlways("<WEBKIT_LLVM_PROFILE><%s><%d>: We will dump the resulting profile to %s.", name, pid, profileFileBase->utf8().data());
int token;
notify_register_dispatch("com.apple.WebKit.profiledata", &token, dispatch_get_main_queue(), ^(int) {
{
// Maybe we could use %t instead here, but this folder is permitted through the sandbox because of ANGLE.
FileSystem::PlatformFileHandle fileHandle;
auto filePath = FileSystem::openTemporaryFile(makeString(name, "-", getpid()), fileHandle, ".profraw"_s);
profileFileBase.get() = String::fromUTF8(filePath.utf8().data());
FileSystem::closeFile(fileHandle);
}
profileFileName.get() = makeString(profileFileBase.get(), ".", profileCount++, ".profraw");
__llvm_profile_set_filename(profileFileName->utf8().data()); // Must stay alive while it is used by llvm.
WTFLogAlways("<WEBKIT_LLVM_PROFILE><%s><%d><%lf>: About to write to %s.",
name, pid, MonotonicTime::now().secondsSinceEpoch().milliseconds(), profileFileName->utf8().data());
int writeResult = __llvm_profile_write_file();
if (writeResult == WRITE_SUCCESS) {
WTFLogAlways("<WEBKIT_LLVM_PROFILE><%s><%d><%lf>: Wrote to file <BEGIN>%s<END>.",
name, pid, MonotonicTime::now().secondsSinceEpoch().milliseconds(), profileFileName->utf8().data());
} else {
WTFLogAlways("<WEBKIT_LLVM_PROFILE><%s><%d><%lf>: Error writing profile file %s.",
name, pid, MonotonicTime::now().secondsSinceEpoch().milliseconds(), profileFileName->utf8().data());
}
__llvm_profile_reset_counters();
});
});
#else
UNUSED_PARAM(name);
#endif
}
} // namespace WTF
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