Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/TCSystemAlloc.cpp

Index: Source/WTF/wtf/TCSystemAlloc.cpp
diff --git a/Source/WTF/wtf/TCSystemAlloc.cpp b/Source/WTF/wtf/TCSystemAlloc.cpp
deleted file mode 100644
index 857520eaff1cca49a83abe69c23a1c77ff341fa7..0000000000000000000000000000000000000000
--- a/Source/WTF/wtf/TCSystemAlloc.cpp
+++ /dev/null
@@ -1,522 +0,0 @@
-// Copyright (c) 2005, 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: Sanjay Ghemawat
-
-#include "config.h"
-#if !USE(SYSTEM_MALLOC)
-#include "TCSystemAlloc.h"
-
-#include "Assertions.h"
-#include "CheckedArithmetic.h"
-#include "TCSpinLock.h"
-#include "UnusedParam.h"
-#include "VMTags.h"
-#include <algorithm>
-#include <stdint.h>
-
-#if OS(WINDOWS)
-#include "windows.h"
-#else
-#include <errno.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#endif
-
-#ifndef MAP_ANONYMOUS
-#define MAP_ANONYMOUS MAP_ANON
-#endif
-
-using namespace std;
-
-// Structure for discovering alignment
-union MemoryAligner {
-  void*  p;
-  double d;
-  size_t s;
-};
-
-static SpinLock spinlock = SPINLOCK_INITIALIZER;
-
-// Page size is initialized on demand
-static size_t pagesize = 0;
-
-// Configuration parameters.
-//
-// if use_devmem is true, either use_sbrk or use_mmap must also be true.
-// For 2.2 kernels, it looks like the sbrk address space (500MBish) and
-// the mmap address space (1300MBish) are disjoint, so we need both allocators
-// to get as much virtual memory as possible.
-#ifndef WTF_CHANGES
-static bool use_devmem = false;
-static bool use_sbrk = false;
-#endif
-
-#if HAVE(MMAP)
-static bool use_mmap = true;
-#endif 
-
-#if HAVE(VIRTUALALLOC)
-static bool use_VirtualAlloc = true;
-#endif
-
-// Flags to keep us from retrying allocators that failed.
-static bool devmem_failure = false;
-static bool sbrk_failure = false;
-static bool mmap_failure = false;
-static bool VirtualAlloc_failure = false;
-
-#ifndef WTF_CHANGES
-DEFINE_int32(malloc_devmem_start, 0,
-             "Physical memory starting location in MB for /dev/mem allocation."
-             "  Setting this to 0 disables /dev/mem allocation");
-DEFINE_int32(malloc_devmem_limit, 0,
-             "Physical memory limit location in MB for /dev/mem allocation."
-             "  Setting this to 0 means no limit.");
-#else
-static const int32_t FLAGS_malloc_devmem_start = 0;
-static const int32_t FLAGS_malloc_devmem_limit = 0;
-#endif
-
-#ifndef WTF_CHANGES
-
-static void* TrySbrk(size_t size, size_t *actual_size, size_t alignment) {
-  size = ((size + alignment - 1) / alignment) * alignment;
-  
-  // could theoretically return the "extra" bytes here, but this
-  // is simple and correct.
-  if (actual_size) 
-    *actual_size = size;
-    
-  void* result = sbrk(size);
-  if (result == reinterpret_cast<void*>(-1)) {
-    sbrk_failure = true;
-    return NULL;
-  }
-
-  // Is it aligned?
-  uintptr_t ptr = reinterpret_cast<uintptr_t>(result);
-  if ((ptr & (alignment-1)) == 0)  return result;
-
-  // Try to get more memory for alignment
-  size_t extra = alignment - (ptr & (alignment-1));
-  void* r2 = sbrk(extra);
-  if (reinterpret_cast<uintptr_t>(r2) == (ptr + size)) {
-    // Contiguous with previous result
-    return reinterpret_cast<void*>(ptr + extra);
-  }
-
-  // Give up and ask for "size + alignment - 1" bytes so
-  // that we can find an aligned region within it.
-  result = sbrk(size + alignment - 1);
-  if (result == reinterpret_cast<void*>(-1)) {
-    sbrk_failure = true;
-    return NULL;
-  }
-  ptr = reinterpret_cast<uintptr_t>(result);
-  if ((ptr & (alignment-1)) != 0) {
-    ptr += alignment - (ptr & (alignment-1));
-  }
-  return reinterpret_cast<void*>(ptr);
-}
-
-#endif /* ifndef(WTF_CHANGES) */
-
-#if HAVE(MMAP)
-
-static void* TryMmap(size_t size, size_t *actual_size, size_t alignment) {
-  // Enforce page alignment
-  if (pagesize == 0) pagesize = getpagesize();
-  if (alignment < pagesize) alignment = pagesize;
-  size = ((size + alignment - 1) / alignment) * alignment;
-  
-  // could theoretically return the "extra" bytes here, but this
-  // is simple and correct.
-  if (actual_size) 
-    *actual_size = size;
-    
-  // Ask for extra memory if alignment > pagesize
-  size_t extra = 0;
-  if (alignment > pagesize) {
-    extra = alignment - pagesize;
-  }
-  Checked<size_t> mapSize = Checked<size_t>(size) + extra + 2 * pagesize;
-  void* result = mmap(NULL, mapSize.unsafeGet(),
-                      PROT_READ | PROT_WRITE,
-                      MAP_PRIVATE|MAP_ANONYMOUS,
-                      VM_TAG_FOR_TCMALLOC_MEMORY, 0);
-  if (result == reinterpret_cast<void*>(MAP_FAILED)) {
-    mmap_failure = true;
-    return NULL;
-  }
-  mmap(result, pagesize, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, VM_TAG_FOR_TCMALLOC_MEMORY, 0);
-  mmap(static_cast<char*>(result) + (mapSize - pagesize).unsafeGet(), pagesize, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, VM_TAG_FOR_TCMALLOC_MEMORY, 0);
-  result = static_cast<char*>(result) + pagesize;
-  // Adjust the return memory so it is aligned
-  uintptr_t ptr = reinterpret_cast<uintptr_t>(result);
-  size_t adjust = 0;
-  if ((ptr & (alignment - 1)) != 0) {
-    adjust = alignment - (ptr & (alignment - 1));
-  }
-
-  // Return the unused memory to the system
-  if (adjust > 0) {
-    munmap(reinterpret_cast<void*>(ptr), adjust);
-  }
-  if (adjust < extra) {
-    munmap(reinterpret_cast<void*>(ptr + adjust + size), extra - adjust);
-  }
-
-  ptr += adjust;
-  return reinterpret_cast<void*>(ptr);
-}
-
-#endif /* HAVE(MMAP) */
-
-#if HAVE(VIRTUALALLOC)
-
-static void* TryVirtualAlloc(size_t size, size_t *actual_size, size_t alignment) {
-  // Enforce page alignment
-  if (pagesize == 0) {
-    SYSTEM_INFO system_info;
-    GetSystemInfo(&system_info);
-    pagesize = system_info.dwPageSize;
-  }
-
-  if (alignment < pagesize) alignment = pagesize;
-  size = ((size + alignment - 1) / alignment) * alignment;
-
-  // could theoretically return the "extra" bytes here, but this
-  // is simple and correct.
-  if (actual_size) 
-    *actual_size = size;
-    
-  // Ask for extra memory if alignment > pagesize
-  size_t extra = 0;
-  if (alignment > pagesize) {
-    extra = alignment - pagesize;
-  }
-  void* result = VirtualAlloc(NULL, size + extra,
-                              MEM_RESERVE | MEM_COMMIT | MEM_TOP_DOWN, 
-                              PAGE_READWRITE);
-
-  if (result == NULL) {
-    VirtualAlloc_failure = true;
-    return NULL;
-  }
-
-  // Adjust the return memory so it is aligned
-  uintptr_t ptr = reinterpret_cast<uintptr_t>(result);
-  size_t adjust = 0;
-  if ((ptr & (alignment - 1)) != 0) {
-    adjust = alignment - (ptr & (alignment - 1));
-  }
-
-  // Return the unused memory to the system - we'd like to release but the best we can do
-  // is decommit, since Windows only lets you free the whole allocation.
-  if (adjust > 0) {
-    VirtualFree(reinterpret_cast<void*>(ptr), adjust, MEM_DECOMMIT);
-  }
-  if (adjust < extra) {
-    VirtualFree(reinterpret_cast<void*>(ptr + adjust + size), extra-adjust, MEM_DECOMMIT);
-  }
-
-  ptr += adjust;
-  return reinterpret_cast<void*>(ptr);
-}
-
-#endif /* HAVE(MMAP) */
-
-#ifndef WTF_CHANGES
-static void* TryDevMem(size_t size, size_t *actual_size, size_t alignment) {
-  static bool initialized = false;
-  static off_t physmem_base;  // next physical memory address to allocate
-  static off_t physmem_limit; // maximum physical address allowed
-  static int physmem_fd;      // file descriptor for /dev/mem
-  
-  // Check if we should use /dev/mem allocation.  Note that it may take
-  // a while to get this flag initialized, so meanwhile we fall back to
-  // the next allocator.  (It looks like 7MB gets allocated before
-  // this flag gets initialized -khr.)
-  if (FLAGS_malloc_devmem_start == 0) {
-    // NOTE: not a devmem_failure - we'd like TCMalloc_SystemAlloc to
-    // try us again next time.
-    return NULL;
-  }
-  
-  if (!initialized) {
-    physmem_fd = open("/dev/mem", O_RDWR);
-    if (physmem_fd < 0) {
-      devmem_failure = true;
-      return NULL;
-    }
-    physmem_base = FLAGS_malloc_devmem_start*1024LL*1024LL;
-    physmem_limit = FLAGS_malloc_devmem_limit*1024LL*1024LL;
-    initialized = true;
-  }
-  
-  // Enforce page alignment
-  if (pagesize == 0) pagesize = getpagesize();
-  if (alignment < pagesize) alignment = pagesize;
-  size = ((size + alignment - 1) / alignment) * alignment;
-    
-  // could theoretically return the "extra" bytes here, but this
-  // is simple and correct.
-  if (actual_size)
-    *actual_size = size;
-    
-  // Ask for extra memory if alignment > pagesize
-  size_t extra = 0;
-  if (alignment > pagesize) {
-    extra = alignment - pagesize;
-  }
-  
-  // check to see if we have any memory left
-  if (physmem_limit != 0 && physmem_base + size + extra > physmem_limit) {
-    devmem_failure = true;
-    return NULL;
-  }
-  void *result = mmap(0, size + extra, PROT_READ | PROT_WRITE,
-                      MAP_SHARED, physmem_fd, physmem_base);
-  if (result == reinterpret_cast<void*>(MAP_FAILED)) {
-    devmem_failure = true;
-    return NULL;
-  }
-  uintptr_t ptr = reinterpret_cast<uintptr_t>(result);
-  
-  // Adjust the return memory so it is aligned
-  size_t adjust = 0;
-  if ((ptr & (alignment - 1)) != 0) {
-    adjust = alignment - (ptr & (alignment - 1));
-  }
-  
-  // Return the unused virtual memory to the system
-  if (adjust > 0) {
-    munmap(reinterpret_cast<void*>(ptr), adjust);
-  }
-  if (adjust < extra) {
-    munmap(reinterpret_cast<void*>(ptr + adjust + size), extra - adjust);
-  }
-  
-  ptr += adjust;
-  physmem_base += adjust + size;
-  
-  return reinterpret_cast<void*>(ptr);
-}
-#endif
-
-void* TCMalloc_SystemAlloc(size_t size, size_t *actual_size, size_t alignment) {
-  // Discard requests that overflow
-  if (size + alignment < size) return NULL;
-    
-  SpinLockHolder lock_holder(&spinlock);
-
-  // Enforce minimum alignment
-  if (alignment < sizeof(MemoryAligner)) alignment = sizeof(MemoryAligner);
-
-  // Try twice, once avoiding allocators that failed before, and once
-  // more trying all allocators even if they failed before.
-  for (int i = 0; i < 2; i++) {
-
-#ifndef WTF_CHANGES
-    if (use_devmem && !devmem_failure) {
-      void* result = TryDevMem(size, actual_size, alignment);
-      if (result != NULL) return result;
-    }
-    
-    if (use_sbrk && !sbrk_failure) {
-      void* result = TrySbrk(size, actual_size, alignment);
-      if (result != NULL) return result;
-    }
-#endif
-
-#if HAVE(MMAP)    
-    if (use_mmap && !mmap_failure) {
-      void* result = TryMmap(size, actual_size, alignment);
-      if (result != NULL) return result;
-    }
-#endif
-
-#if HAVE(VIRTUALALLOC)
-    if (use_VirtualAlloc && !VirtualAlloc_failure) {
-      void* result = TryVirtualAlloc(size, actual_size, alignment);
-      if (result != NULL) return result;
-    }
-#endif
-
-    // nothing worked - reset failure flags and try again
-    devmem_failure = false;
-    sbrk_failure = false;
-    mmap_failure = false;
-    VirtualAlloc_failure = false;
-  }
-  return NULL;
-}
-
-#if HAVE(MADV_FREE_REUSE)
-
-void TCMalloc_SystemRelease(void* start, size_t length)
-{
-    int madviseResult;
-
-    while ((madviseResult = madvise(start, length, MADV_FREE_REUSABLE)) == -1 && errno == EAGAIN) { }
-
-    // Although really advisory, if madvise fail, we want to know about it.
-    ASSERT_UNUSED(madviseResult, madviseResult != -1);
-}
-
-#elif HAVE(MADV_FREE) || HAVE(MADV_DONTNEED)
-
-void TCMalloc_SystemRelease(void* start, size_t length)
-{
-    // MADV_FREE clears the modified bit on pages, which allows
-    // them to be discarded immediately.
-#if HAVE(MADV_FREE)
-    const int advice = MADV_FREE;
-#else
-    const int advice = MADV_DONTNEED;
-#endif
-  if (FLAGS_malloc_devmem_start) {
-    // It's not safe to use MADV_DONTNEED if we've been mapping
-    // /dev/mem for heap memory
-    return;
-  }
-  if (pagesize == 0) pagesize = getpagesize();
-  const size_t pagemask = pagesize - 1;
-
-  size_t new_start = reinterpret_cast<size_t>(start);
-  size_t end = new_start + length;
-  size_t new_end = end;
-
-  // Round up the starting address and round down the ending address
-  // to be page aligned:
-  new_start = (new_start + pagesize - 1) & ~pagemask;
-  new_end = new_end & ~pagemask;
-
-  ASSERT((new_start & pagemask) == 0);
-  ASSERT((new_end & pagemask) == 0);
-  ASSERT(new_start >= reinterpret_cast<size_t>(start));
-  ASSERT(new_end <= end);
-
-  if (new_end > new_start) {
-    // Note -- ignoring most return codes, because if this fails it
-    // doesn't matter...
-    while (madvise(reinterpret_cast<char*>(new_start), new_end - new_start,
-                   advice) == -1 &&
-           errno == EAGAIN) {
-      // NOP
-    }
-  }
-}
-
-#elif HAVE(MMAP)
-
-void TCMalloc_SystemRelease(void* start, size_t length)
-{
-  void* newAddress = mmap(start, length, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
-  // If the mmap failed then that's ok, we just won't return the memory to the system.
-  ASSERT_UNUSED(newAddress, newAddress == start || newAddress == reinterpret_cast<void*>(MAP_FAILED));
-}
-
-#elif HAVE(VIRTUALALLOC)
-
-void TCMalloc_SystemRelease(void* start, size_t length)
-{
-    if (VirtualFree(start, length, MEM_DECOMMIT))
-        return;
-
-    // The decommit may fail if the memory region consists of allocations
-    // from more than one call to VirtualAlloc.  In this case, fall back to
-    // using VirtualQuery to retrieve the allocation boundaries and decommit
-    // them each individually.
-
-    char* ptr = static_cast<char*>(start);
-    char* end = ptr + length;
-    MEMORY_BASIC_INFORMATION info;
-    while (ptr < end) {
-        size_t resultSize = VirtualQuery(ptr, &info, sizeof(info));
-        ASSERT_UNUSED(resultSize, resultSize == sizeof(info));
-
-        size_t decommitSize = min<size_t>(info.RegionSize, end - ptr);
-        BOOL success = VirtualFree(ptr, decommitSize, MEM_DECOMMIT);
-        ASSERT_UNUSED(success, success);
-        ptr += decommitSize;
-    }
-}
-
-#else
-
-// Platforms that don't support returning memory use an empty inline version of TCMalloc_SystemRelease
-// declared in TCSystemAlloc.h
-
-#endif
-
-#if HAVE(MADV_FREE_REUSE)
-
-void TCMalloc_SystemCommit(void* start, size_t length)
-{
-    while (madvise(start, length, MADV_FREE_REUSE) == -1 && errno == EAGAIN) { }
-}
-
-#elif HAVE(VIRTUALALLOC)
-
-void TCMalloc_SystemCommit(void* start, size_t length)
-{
-    if (VirtualAlloc(start, length, MEM_COMMIT, PAGE_READWRITE) == start)
-        return;
-
-    // The commit may fail if the memory region consists of allocations
-    // from more than one call to VirtualAlloc.  In this case, fall back to
-    // using VirtualQuery to retrieve the allocation boundaries and commit them
-    // each individually.
-
-    char* ptr = static_cast<char*>(start);
-    char* end = ptr + length;
-    MEMORY_BASIC_INFORMATION info;
-    while (ptr < end) {
-        size_t resultSize = VirtualQuery(ptr, &info, sizeof(info));
-        ASSERT_UNUSED(resultSize, resultSize == sizeof(info));
-
-        size_t commitSize = min<size_t>(info.RegionSize, end - ptr);
-        void* newAddress = VirtualAlloc(ptr, commitSize, MEM_COMMIT, PAGE_READWRITE);
-        ASSERT_UNUSED(newAddress, newAddress == ptr);
-        ptr += commitSize;
-    }
-}
-
-#else
-
-// Platforms that don't need to explicitly commit memory use an empty inline version of TCMalloc_SystemCommit
-// declared in TCSystemAlloc.h
-
-#endif
-
-#endif // #if !USE(SYSTEM_MALLOC)
-