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//===-- xray_utils.cc -------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file is a part of XRay, a dynamic runtime instrumentation system.
//
//===----------------------------------------------------------------------===//
#include "xray_utils.h"
#include "sanitizer_common/sanitizer_allocator_internal.h"
#include "sanitizer_common/sanitizer_common.h"
#include "xray_allocator.h"
#include "xray_defs.h"
#include "xray_flags.h"
#include <cstdio>
#include <errno.h>
#include <fcntl.h>
#include <iterator>
#include <stdlib.h>
#include <sys/types.h>
#include <tuple>
#include <unistd.h>
#include <utility>
#if SANITIZER_FUCHSIA
#include "sanitizer_common/sanitizer_symbolizer_fuchsia.h"
#include <inttypes.h>
#include <zircon/process.h>
#include <zircon/sanitizer.h>
#include <zircon/status.h>
#include <zircon/syscalls.h>
#endif
namespace __xray {
#if SANITIZER_FUCHSIA
constexpr const char* ProfileSinkName = "llvm-xray";
LogWriter::~LogWriter() {
_zx_handle_close(Vmo);
}
void LogWriter::WriteAll(const char *Begin, const char *End) XRAY_NEVER_INSTRUMENT {
if (Begin == End)
return;
auto TotalBytes = std::distance(Begin, End);
const size_t PageSize = flags()->xray_page_size_override > 0
? flags()->xray_page_size_override
: GetPageSizeCached();
if (RoundUpTo(Offset, PageSize) != RoundUpTo(Offset + TotalBytes, PageSize)) {
// Resize the VMO to ensure there's sufficient space for the data.
zx_status_t Status = _zx_vmo_set_size(Vmo, Offset + TotalBytes);
if (Status != ZX_OK) {
Report("Failed to resize VMO: %s\n", _zx_status_get_string(Status));
return;
}
}
// Write the data into VMO.
zx_status_t Status = _zx_vmo_write(Vmo, Begin, Offset, TotalBytes);
if (Status != ZX_OK) {
Report("Failed to write: %s\n", _zx_status_get_string(Status));
return;
}
Offset += TotalBytes;
}
void LogWriter::Flush() XRAY_NEVER_INSTRUMENT {
// Nothing to do here since WriteAll writes directly into the VMO.
}
LogWriter *LogWriter::Open() XRAY_NEVER_INSTRUMENT {
// Create VMO to hold the profile data.
zx_handle_t Vmo;
zx_status_t Status = _zx_vmo_create(0, ZX_VMO_RESIZABLE, &Vmo);
if (Status != ZX_OK) {
Report("XRay: cannot create VMO: %s\n", _zx_status_get_string(Status));
return nullptr;
}
// Get the KOID of the current process to use in the VMO name.
zx_info_handle_basic_t Info;
Status = _zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &Info,
sizeof(Info), NULL, NULL);
if (Status != ZX_OK) {
Report("XRay: cannot get basic info about current process handle: %s\n",
_zx_status_get_string(Status));
return nullptr;
}
// Give the VMO a name including our process KOID so it's easy to spot.
char VmoName[ZX_MAX_NAME_LEN];
internal_snprintf(VmoName, sizeof(VmoName), "%s.%zu", ProfileSinkName,
Info.koid);
_zx_object_set_property(Vmo, ZX_PROP_NAME, VmoName, strlen(VmoName));
// Duplicate the handle since __sanitizer_publish_data consumes it and
// LogWriter needs to hold onto it.
zx_handle_t Handle;
Status =_zx_handle_duplicate(Vmo, ZX_RIGHT_SAME_RIGHTS, &Handle);
if (Status != ZX_OK) {
Report("XRay: cannot duplicate VMO handle: %s\n",
_zx_status_get_string(Status));
return nullptr;
}
// Publish the VMO that receives the logging. Note the VMO's contents can
// grow and change after publication. The contents won't be read out until
// after the process exits.
__sanitizer_publish_data(ProfileSinkName, Handle);
// Use the dumpfile symbolizer markup element to write the name of the VMO.
Report("XRay: " FORMAT_DUMPFILE "\n", ProfileSinkName, VmoName);
LogWriter *LW = reinterpret_cast<LogWriter *>(InternalAlloc(sizeof(LogWriter)));
new (LW) LogWriter(Vmo);
return LW;
}
void LogWriter::Close(LogWriter *LW) {
LW->~LogWriter();
InternalFree(LW);
}
#else // SANITIZER_FUCHSIA
LogWriter::~LogWriter() {
internal_close(Fd);
}
void LogWriter::WriteAll(const char *Begin, const char *End) XRAY_NEVER_INSTRUMENT {
if (Begin == End)
return;
auto TotalBytes = std::distance(Begin, End);
while (auto Written = write(Fd, Begin, TotalBytes)) {
if (Written < 0) {
if (errno == EINTR)
continue; // Try again.
Report("Failed to write; errno = %d\n", errno);
return;
}
TotalBytes -= Written;
if (TotalBytes == 0)
break;
Begin += Written;
}
}
void LogWriter::Flush() XRAY_NEVER_INSTRUMENT {
fsync(Fd);
}
LogWriter *LogWriter::Open() XRAY_NEVER_INSTRUMENT {
// Open a temporary file once for the log.
char TmpFilename[256] = {};
char TmpWildcardPattern[] = "XXXXXX";
auto **Argv = GetArgv();
const char *Progname = !Argv ? "(unknown)" : Argv[0];
const char *LastSlash = internal_strrchr(Progname, '/');
if (LastSlash != nullptr)
Progname = LastSlash + 1;
int NeededLength = internal_snprintf(
TmpFilename, sizeof(TmpFilename), "%s%s.%s",
flags()->xray_logfile_base, Progname, TmpWildcardPattern);
if (NeededLength > int(sizeof(TmpFilename))) {
Report("XRay log file name too long (%d): %s\n", NeededLength, TmpFilename);
return nullptr;
}
int Fd = mkstemp(TmpFilename);
if (Fd == -1) {
Report("XRay: Failed opening temporary file '%s'; not logging events.\n",
TmpFilename);
return nullptr;
}
if (Verbosity())
Report("XRay: Log file in '%s'\n", TmpFilename);
LogWriter *LW = allocate<LogWriter>();
new (LW) LogWriter(Fd);
return LW;
}
void LogWriter::Close(LogWriter *LW) {
LW->~LogWriter();
deallocate(LW);
}
#endif // SANITIZER_FUCHSIA
} // namespace __xray
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