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Diffstat (limited to 'src/third_party/gperftools-2.7/src/windows/port.cc')
| -rw-r--r-- | src/third_party/gperftools-2.7/src/windows/port.cc | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/src/third_party/gperftools-2.7/src/windows/port.cc b/src/third_party/gperftools-2.7/src/windows/port.cc new file mode 100644 index 00000000000..76224a23431 --- /dev/null +++ b/src/third_party/gperftools-2.7/src/windows/port.cc @@ -0,0 +1,235 @@ +// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- +/* Copyright (c) 2007, Google 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: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * 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. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "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 THE COPYRIGHT + * OWNER 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. + * + * --- + * Author: Craig Silverstein + */ + +#ifndef _WIN32 +# error You should only be including windows/port.cc in a windows environment! +#endif + +#define NOMINMAX // so std::max, below, compiles correctly +#include <config.h> +#include <string.h> // for strlen(), memset(), memcmp() +#include <assert.h> +#include <stdarg.h> // for va_list, va_start, va_end +#include <algorithm> // for std:{min,max} +#include <windows.h> +#include "port.h" +#include "base/logging.h" +#include "base/spinlock.h" +#include "internal_logging.h" + +// ----------------------------------------------------------------------- +// Basic libraries + +PERFTOOLS_DLL_DECL +int getpagesize() { + static int pagesize = 0; + if (pagesize == 0) { + SYSTEM_INFO system_info; + GetSystemInfo(&system_info); + pagesize = std::max(system_info.dwPageSize, + system_info.dwAllocationGranularity); + } + return pagesize; +} + +extern "C" PERFTOOLS_DLL_DECL void* __sbrk(ptrdiff_t increment) { + LOG(FATAL, "Windows doesn't implement sbrk!\n"); + return NULL; +} + +// We need to write to 'stderr' without having windows allocate memory. +// The safest way is via a low-level call like WriteConsoleA(). But +// even then we need to be sure to print in small bursts so as to not +// require memory allocation. +extern "C" PERFTOOLS_DLL_DECL void WriteToStderr(const char* buf, int len) { + // Looks like windows allocates for writes of >80 bytes + for (int i = 0; i < len; i += 80) { + write(STDERR_FILENO, buf + i, std::min(80, len - i)); + } +} + + +// ----------------------------------------------------------------------- +// Threads code + +// Windows doesn't support pthread_key_create's destr_function, and in +// fact it's a bit tricky to get code to run when a thread exits. This +// is cargo-cult magic from http://www.codeproject.com/threads/tls.asp. +// This code is for VC++ 7.1 and later; VC++ 6.0 support is possible +// but more busy-work -- see the webpage for how to do it. If all +// this fails, we could use DllMain instead. The big problem with +// DllMain is it doesn't run if this code is statically linked into a +// binary (it also doesn't run if the thread is terminated via +// TerminateThread, which if we're lucky this routine does). + +// Force a reference to _tls_used to make the linker create the TLS directory +// if it's not already there (that is, even if __declspec(thread) is not used). +// Force a reference to p_thread_callback_tcmalloc and p_process_term_tcmalloc +// to prevent whole program optimization from discarding the variables. +#ifdef _MSC_VER +#if defined(_M_IX86) +#pragma comment(linker, "/INCLUDE:__tls_used") +#pragma comment(linker, "/INCLUDE:_p_thread_callback_tcmalloc") +#pragma comment(linker, "/INCLUDE:_p_process_term_tcmalloc") +#elif defined(_M_X64) +#pragma comment(linker, "/INCLUDE:_tls_used") +#pragma comment(linker, "/INCLUDE:p_thread_callback_tcmalloc") +#pragma comment(linker, "/INCLUDE:p_process_term_tcmalloc") +#endif +#endif + +// When destr_fn eventually runs, it's supposed to take as its +// argument the tls-value associated with key that pthread_key_create +// creates. (Yeah, it sounds confusing but it's really not.) We +// store the destr_fn/key pair in this data structure. Because we +// store this in a single var, this implies we can only have one +// destr_fn in a program! That's enough in practice. If asserts +// trigger because we end up needing more, we'll have to turn this +// into an array. +struct DestrFnClosure { + void (*destr_fn)(void*); + pthread_key_t key_for_destr_fn_arg; +}; + +static DestrFnClosure destr_fn_info; // initted to all NULL/0. + +static int on_process_term(void) { + if (destr_fn_info.destr_fn) { + void *ptr = TlsGetValue(destr_fn_info.key_for_destr_fn_arg); + // This shouldn't be necessary, but in Release mode, Windows + // sometimes trashes the pointer in the TLS slot, so we need to + // remove the pointer from the TLS slot before the thread dies. + TlsSetValue(destr_fn_info.key_for_destr_fn_arg, NULL); + if (ptr) // pthread semantics say not to call if ptr is NULL + (*destr_fn_info.destr_fn)(ptr); + } + return 0; +} + +static void NTAPI on_tls_callback(HINSTANCE h, DWORD dwReason, PVOID pv) { + if (dwReason == DLL_THREAD_DETACH) { // thread is being destroyed! + on_process_term(); + } +} + +#ifdef _MSC_VER + +// extern "C" suppresses C++ name mangling so we know the symbol names +// for the linker /INCLUDE:symbol pragmas above. +extern "C" { +// This tells the linker to run these functions. +#pragma data_seg(push, old_seg) +#pragma data_seg(".CRT$XLB") +void (NTAPI *p_thread_callback_tcmalloc)( + HINSTANCE h, DWORD dwReason, PVOID pv) = on_tls_callback; +#pragma data_seg(".CRT$XTU") +int (*p_process_term_tcmalloc)(void) = on_process_term; +#pragma data_seg(pop, old_seg) +} // extern "C" + +#else // #ifdef _MSC_VER [probably msys/mingw] + +// We have to try the DllMain solution here, because we can't use the +// msvc-specific pragmas. +BOOL WINAPI DllMain(HINSTANCE h, DWORD dwReason, PVOID pv) { + if (dwReason == DLL_THREAD_DETACH) + on_tls_callback(h, dwReason, pv); + else if (dwReason == DLL_PROCESS_DETACH) + on_process_term(); + return TRUE; +} + +#endif // #ifdef _MSC_VER + +extern "C" pthread_key_t PthreadKeyCreate(void (*destr_fn)(void*)) { + // Semantics are: we create a new key, and then promise to call + // destr_fn with TlsGetValue(key) when the thread is destroyed + // (as long as TlsGetValue(key) is not NULL). + pthread_key_t key = TlsAlloc(); + if (destr_fn) { // register it + // If this assert fails, we'll need to support an array of destr_fn_infos + assert(destr_fn_info.destr_fn == NULL); + destr_fn_info.destr_fn = destr_fn; + destr_fn_info.key_for_destr_fn_arg = key; + } + return key; +} + +// NOTE: this is Win2K and later. For Win98 we could use a CRITICAL_SECTION... +extern "C" int perftools_pthread_once(pthread_once_t *once_control, + void (*init_routine)(void)) { + // Try for a fast path first. Note: this should be an acquire semantics read. + // It is on x86 and x64, where Windows runs. + if (*once_control != 1) { + while (true) { + switch (InterlockedCompareExchange(once_control, 2, 0)) { + case 0: + init_routine(); + InterlockedExchange(once_control, 1); + return 0; + case 1: + // The initializer has already been executed + return 0; + default: + // The initializer is being processed by another thread + SwitchToThread(); + } + } + } + return 0; +} + + +// ----------------------------------------------------------------------- +// These functions rework existing functions of the same name in the +// Google codebase. + +// A replacement for HeapProfiler::CleanupOldProfiles. +void DeleteMatchingFiles(const char* prefix, const char* full_glob) { + WIN32_FIND_DATAA found; // that final A is for Ansi (as opposed to Unicode) + HANDLE hFind = FindFirstFileA(full_glob, &found); // A is for Ansi + if (hFind != INVALID_HANDLE_VALUE) { + const int prefix_length = strlen(prefix); + do { + const char *fname = found.cFileName; + if ((strlen(fname) >= prefix_length) && + (memcmp(fname, prefix, prefix_length) == 0)) { + RAW_VLOG(0, "Removing old heap profile %s\n", fname); + // TODO(csilvers): we really need to unlink dirname + fname + _unlink(fname); + } + } while (FindNextFileA(hFind, &found) != FALSE); // A is for Ansi + FindClose(hFind); + } +} |