Move platform abstraction to base library

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
deleted file mode 100644
index 9d7c8cd14137a92dbe15fda5827897fb691cab90..0000000000000000000000000000000000000000
--- a/src/platform-linux.cc
+++ /dev/null
@@ -1,432 +0,0 @@
-// Copyright 2012 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Platform-specific code for Linux goes here. For the POSIX-compatible
-// parts, the implementation is in platform-posix.cc.
-
-#include <pthread.h>
-#include <semaphore.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <sys/prctl.h>
-#include <sys/resource.h>
-#include <sys/syscall.h>
-#include <sys/time.h>
-#include <sys/types.h>
-
-// Ubuntu Dapper requires memory pages to be marked as
-// executable. Otherwise, OS raises an exception when executing code
-// in that page.
-#include <errno.h>
-#include <fcntl.h>      // open
-#include <stdarg.h>
-#include <strings.h>    // index
-#include <sys/mman.h>   // mmap & munmap
-#include <sys/stat.h>   // open
-#include <sys/types.h>  // mmap & munmap
-#include <unistd.h>     // sysconf
-
-// GLibc on ARM defines mcontext_t has a typedef for 'struct sigcontext'.
-// Old versions of the C library <signal.h> didn't define the type.
-#if defined(__ANDROID__) && !defined(__BIONIC_HAVE_UCONTEXT_T) && \
-    (defined(__arm__) || defined(__aarch64__)) && \
-    !defined(__BIONIC_HAVE_STRUCT_SIGCONTEXT)
-#include <asm/sigcontext.h>  // NOLINT
-#endif
-
-#if defined(LEAK_SANITIZER)
-#include <sanitizer/lsan_interface.h>
-#endif
-
-#include <cmath>
-
-#undef MAP_TYPE
-
-#include "src/platform.h"
-#include "src/utils.h"
-
-
-namespace v8 {
-namespace internal {
-
-
-#ifdef __arm__
-
-bool OS::ArmUsingHardFloat() {
-  // GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
-  // the Floating Point ABI used (PCS stands for Procedure Call Standard).
-  // We use these as well as a couple of other defines to statically determine
-  // what FP ABI used.
-  // GCC versions 4.4 and below don't support hard-fp.
-  // GCC versions 4.5 may support hard-fp without defining __ARM_PCS or
-  // __ARM_PCS_VFP.
-
-#define GCC_VERSION (__GNUC__ * 10000                                          \
-                     + __GNUC_MINOR__ * 100                                    \
-                     + __GNUC_PATCHLEVEL__)
-#if GCC_VERSION >= 40600
-#if defined(__ARM_PCS_VFP)
-  return true;
-#else
-  return false;
-#endif
-
-#elif GCC_VERSION < 40500
-  return false;
-
-#else
-#if defined(__ARM_PCS_VFP)
-  return true;
-#elif defined(__ARM_PCS) || defined(__SOFTFP__) || defined(__SOFTFP) || \
-      !defined(__VFP_FP__)
-  return false;
-#else
-#error "Your version of GCC does not report the FP ABI compiled for."          \
-       "Please report it on this issue"                                        \
-       "http://code.google.com/p/v8/issues/detail?id=2140"
-
-#endif
-#endif
-#undef GCC_VERSION
-}
-
-#endif  // def __arm__
-
-
-const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
-  if (std::isnan(time)) return "";
-  time_t tv = static_cast<time_t>(std::floor(time/msPerSecond));
-  struct tm* t = localtime(&tv);
-  if (NULL == t) return "";
-  return t->tm_zone;
-}
-
-
-double OS::LocalTimeOffset(TimezoneCache* cache) {
-  time_t tv = time(NULL);
-  struct tm* t = localtime(&tv);
-  // tm_gmtoff includes any daylight savings offset, so subtract it.
-  return static_cast<double>(t->tm_gmtoff * msPerSecond -
-                             (t->tm_isdst > 0 ? 3600 * msPerSecond : 0));
-}
-
-
-void* OS::Allocate(const size_t requested,
-                   size_t* allocated,
-                   bool is_executable) {
-  const size_t msize = RoundUp(requested, AllocateAlignment());
-  int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
-  void* addr = OS::GetRandomMmapAddr();
-  void* mbase = mmap(addr, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-  if (mbase == MAP_FAILED) return NULL;
-  *allocated = msize;
-  return mbase;
-}
-
-
-class PosixMemoryMappedFile : public OS::MemoryMappedFile {
- public:
-  PosixMemoryMappedFile(FILE* file, void* memory, int size)
-    : file_(file), memory_(memory), size_(size) { }
-  virtual ~PosixMemoryMappedFile();
-  virtual void* memory() { return memory_; }
-  virtual int size() { return size_; }
- private:
-  FILE* file_;
-  void* memory_;
-  int size_;
-};
-
-
-OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
-  FILE* file = fopen(name, "r+");
-  if (file == NULL) return NULL;
-
-  fseek(file, 0, SEEK_END);
-  int size = ftell(file);
-
-  void* memory =
-      mmap(OS::GetRandomMmapAddr(),
-           size,
-           PROT_READ | PROT_WRITE,
-           MAP_SHARED,
-           fileno(file),
-           0);
-  return new PosixMemoryMappedFile(file, memory, size);
-}
-
-
-OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
-    void* initial) {
-  FILE* file = fopen(name, "w+");
-  if (file == NULL) return NULL;
-  int result = fwrite(initial, size, 1, file);
-  if (result < 1) {
-    fclose(file);
-    return NULL;
-  }
-  void* memory =
-      mmap(OS::GetRandomMmapAddr(),
-           size,
-           PROT_READ | PROT_WRITE,
-           MAP_SHARED,
-           fileno(file),
-           0);
-  return new PosixMemoryMappedFile(file, memory, size);
-}
-
-
-PosixMemoryMappedFile::~PosixMemoryMappedFile() {
-  if (memory_) OS::Free(memory_, size_);
-  fclose(file_);
-}
-
-
-std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
-  std::vector<SharedLibraryAddress> result;
-  // This function assumes that the layout of the file is as follows:
-  // hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name]
-  // If we encounter an unexpected situation we abort scanning further entries.
-  FILE* fp = fopen("/proc/self/maps", "r");
-  if (fp == NULL) return result;
-
-  // Allocate enough room to be able to store a full file name.
-  const int kLibNameLen = FILENAME_MAX + 1;
-  char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen));
-
-  // This loop will terminate once the scanning hits an EOF.
-  while (true) {
-    uintptr_t start, end;
-    char attr_r, attr_w, attr_x, attr_p;
-    // Parse the addresses and permission bits at the beginning of the line.
-    if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break;
-    if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break;
-
-    int c;
-    if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') {
-      // Found a read-only executable entry. Skip characters until we reach
-      // the beginning of the filename or the end of the line.
-      do {
-        c = getc(fp);
-      } while ((c != EOF) && (c != '\n') && (c != '/') && (c != '['));
-      if (c == EOF) break;  // EOF: Was unexpected, just exit.
-
-      // Process the filename if found.
-      if ((c == '/') || (c == '[')) {
-        // Push the '/' or '[' back into the stream to be read below.
-        ungetc(c, fp);
-
-        // Read to the end of the line. Exit if the read fails.
-        if (fgets(lib_name, kLibNameLen, fp) == NULL) break;
-
-        // Drop the newline character read by fgets. We do not need to check
-        // for a zero-length string because we know that we at least read the
-        // '/' or '[' character.
-        lib_name[strlen(lib_name) - 1] = '\0';
-      } else {
-        // No library name found, just record the raw address range.
-        snprintf(lib_name, kLibNameLen,
-                 "%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end);
-      }
-      result.push_back(SharedLibraryAddress(lib_name, start, end));
-    } else {
-      // Entry not describing executable data. Skip to end of line to set up
-      // reading the next entry.
-      do {
-        c = getc(fp);
-      } while ((c != EOF) && (c != '\n'));
-      if (c == EOF) break;
-    }
-  }
-  free(lib_name);
-  fclose(fp);
-  return result;
-}
-
-
-void OS::SignalCodeMovingGC() {
-  // Support for ll_prof.py.
-  //
-  // The Linux profiler built into the kernel logs all mmap's with
-  // PROT_EXEC so that analysis tools can properly attribute ticks. We
-  // do a mmap with a name known by ll_prof.py and immediately munmap
-  // it. This injects a GC marker into the stream of events generated
-  // by the kernel and allows us to synchronize V8 code log and the
-  // kernel log.
-  int size = sysconf(_SC_PAGESIZE);
-  FILE* f = fopen(OS::GetGCFakeMMapFile(), "w+");
-  if (f == NULL) {
-    OS::PrintError("Failed to open %s\n", OS::GetGCFakeMMapFile());
-    OS::Abort();
-  }
-  void* addr = mmap(OS::GetRandomMmapAddr(),
-                    size,
-#if defined(__native_client__)
-                    // The Native Client port of V8 uses an interpreter,
-                    // so code pages don't need PROT_EXEC.
-                    PROT_READ,
-#else
-                    PROT_READ | PROT_EXEC,
-#endif
-                    MAP_PRIVATE,
-                    fileno(f),
-                    0);
-  ASSERT(addr != MAP_FAILED);
-  OS::Free(addr, size);
-  fclose(f);
-}
-
-
-// Constants used for mmap.
-static const int kMmapFd = -1;
-static const int kMmapFdOffset = 0;
-
-
-VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
-
-
-VirtualMemory::VirtualMemory(size_t size)
-    : address_(ReserveRegion(size)), size_(size) { }
-
-
-VirtualMemory::VirtualMemory(size_t size, size_t alignment)
-    : address_(NULL), size_(0) {
-  ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
-  size_t request_size = RoundUp(size + alignment,
-                                static_cast<intptr_t>(OS::AllocateAlignment()));
-  void* reservation = mmap(OS::GetRandomMmapAddr(),
-                           request_size,
-                           PROT_NONE,
-                           MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE,
-                           kMmapFd,
-                           kMmapFdOffset);
-  if (reservation == MAP_FAILED) return;
-
-  uint8_t* base = static_cast<uint8_t*>(reservation);
-  uint8_t* aligned_base = RoundUp(base, alignment);
-  ASSERT_LE(base, aligned_base);
-
-  // Unmap extra memory reserved before and after the desired block.
-  if (aligned_base != base) {
-    size_t prefix_size = static_cast<size_t>(aligned_base - base);
-    OS::Free(base, prefix_size);
-    request_size -= prefix_size;
-  }
-
-  size_t aligned_size = RoundUp(size, OS::AllocateAlignment());
-  ASSERT_LE(aligned_size, request_size);
-
-  if (aligned_size != request_size) {
-    size_t suffix_size = request_size - aligned_size;
-    OS::Free(aligned_base + aligned_size, suffix_size);
-    request_size -= suffix_size;
-  }
-
-  ASSERT(aligned_size == request_size);
-
-  address_ = static_cast<void*>(aligned_base);
-  size_ = aligned_size;
-#if defined(LEAK_SANITIZER)
-  __lsan_register_root_region(address_, size_);
-#endif
-}
-
-
-VirtualMemory::~VirtualMemory() {
-  if (IsReserved()) {
-    bool result = ReleaseRegion(address(), size());
-    ASSERT(result);
-    USE(result);
-  }
-}
-
-
-bool VirtualMemory::IsReserved() {
-  return address_ != NULL;
-}
-
-
-void VirtualMemory::Reset() {
-  address_ = NULL;
-  size_ = 0;
-}
-
-
-bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
-  return CommitRegion(address, size, is_executable);
-}
-
-
-bool VirtualMemory::Uncommit(void* address, size_t size) {
-  return UncommitRegion(address, size);
-}
-
-
-bool VirtualMemory::Guard(void* address) {
-  OS::Guard(address, OS::CommitPageSize());
-  return true;
-}
-
-
-void* VirtualMemory::ReserveRegion(size_t size) {
-  void* result = mmap(OS::GetRandomMmapAddr(),
-                      size,
-                      PROT_NONE,
-                      MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE,
-                      kMmapFd,
-                      kMmapFdOffset);
-
-  if (result == MAP_FAILED) return NULL;
-
-#if defined(LEAK_SANITIZER)
-  __lsan_register_root_region(result, size);
-#endif
-  return result;
-}
-
-
-bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
-#if defined(__native_client__)
-  // The Native Client port of V8 uses an interpreter,
-  // so code pages don't need PROT_EXEC.
-  int prot = PROT_READ | PROT_WRITE;
-#else
-  int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
-#endif
-  if (MAP_FAILED == mmap(base,
-                         size,
-                         prot,
-                         MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
-                         kMmapFd,
-                         kMmapFdOffset)) {
-    return false;
-  }
-
-  return true;
-}
-
-
-bool VirtualMemory::UncommitRegion(void* base, size_t size) {
-  return mmap(base,
-              size,
-              PROT_NONE,
-              MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED,
-              kMmapFd,
-              kMmapFdOffset) != MAP_FAILED;
-}
-
-
-bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
-#if defined(LEAK_SANITIZER)
-  __lsan_unregister_root_region(base, size);
-#endif
-  return munmap(base, size) == 0;
-}
-
-
-bool VirtualMemory::HasLazyCommits() {
-  return true;
-}
-
-} }  // namespace v8::internal