75de923f3c
This also removes the platform-posix.h header file. R=machenbach@chromium.org Review URL: https://codereview.chromium.org/23497009 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16890 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
445 lines
13 KiB
C++
445 lines
13 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Platform specific code for Linux goes here. For the POSIX comaptible parts
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// the implementation is in platform-posix.cc.
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#include <pthread.h>
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#include <semaphore.h>
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#include <signal.h>
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#include <sys/prctl.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <stdlib.h>
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// Ubuntu Dapper requires memory pages to be marked as
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// executable. Otherwise, OS raises an exception when executing code
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// in that page.
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#include <sys/types.h> // mmap & munmap
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#include <sys/mman.h> // mmap & munmap
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#include <sys/stat.h> // open
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#include <fcntl.h> // open
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#include <unistd.h> // sysconf
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#include <strings.h> // index
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#include <errno.h>
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#include <stdarg.h>
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// GLibc on ARM defines mcontext_t has a typedef for 'struct sigcontext'.
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// Old versions of the C library <signal.h> didn't define the type.
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#if defined(__ANDROID__) && !defined(__BIONIC_HAVE_UCONTEXT_T) && \
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defined(__arm__) && !defined(__BIONIC_HAVE_STRUCT_SIGCONTEXT)
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#include <asm/sigcontext.h>
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#endif
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#undef MAP_TYPE
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#include "v8.h"
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#include "platform.h"
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#include "v8threads.h"
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#include "vm-state-inl.h"
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namespace v8 {
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namespace internal {
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#ifdef __arm__
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bool OS::ArmUsingHardFloat() {
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// GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
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// the Floating Point ABI used (PCS stands for Procedure Call Standard).
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// We use these as well as a couple of other defines to statically determine
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// what FP ABI used.
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// GCC versions 4.4 and below don't support hard-fp.
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// GCC versions 4.5 may support hard-fp without defining __ARM_PCS or
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// __ARM_PCS_VFP.
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#define GCC_VERSION (__GNUC__ * 10000 \
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+ __GNUC_MINOR__ * 100 \
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+ __GNUC_PATCHLEVEL__)
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#if GCC_VERSION >= 40600
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#if defined(__ARM_PCS_VFP)
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return true;
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#else
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return false;
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#endif
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#elif GCC_VERSION < 40500
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return false;
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#else
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#if defined(__ARM_PCS_VFP)
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return true;
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#elif defined(__ARM_PCS) || defined(__SOFTFP__) || defined(__SOFTFP) || \
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!defined(__VFP_FP__)
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return false;
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#else
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#error "Your version of GCC does not report the FP ABI compiled for." \
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"Please report it on this issue" \
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"http://code.google.com/p/v8/issues/detail?id=2140"
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#endif
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#endif
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#undef GCC_VERSION
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}
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#endif // def __arm__
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const char* OS::LocalTimezone(double time) {
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if (std::isnan(time)) return "";
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time_t tv = static_cast<time_t>(floor(time/msPerSecond));
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struct tm* t = localtime(&tv);
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if (NULL == t) return "";
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return t->tm_zone;
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}
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double OS::LocalTimeOffset() {
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time_t tv = time(NULL);
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struct tm* t = localtime(&tv);
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// tm_gmtoff includes any daylight savings offset, so subtract it.
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return static_cast<double>(t->tm_gmtoff * msPerSecond -
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(t->tm_isdst > 0 ? 3600 * msPerSecond : 0));
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}
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void* OS::Allocate(const size_t requested,
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size_t* allocated,
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bool is_executable) {
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const size_t msize = RoundUp(requested, AllocateAlignment());
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int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
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void* addr = OS::GetRandomMmapAddr();
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void* mbase = mmap(addr, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (mbase == MAP_FAILED) {
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LOG(i::Isolate::Current(),
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StringEvent("OS::Allocate", "mmap failed"));
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return NULL;
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}
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*allocated = msize;
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return mbase;
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}
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class PosixMemoryMappedFile : public OS::MemoryMappedFile {
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public:
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PosixMemoryMappedFile(FILE* file, void* memory, int size)
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: file_(file), memory_(memory), size_(size) { }
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virtual ~PosixMemoryMappedFile();
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virtual void* memory() { return memory_; }
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virtual int size() { return size_; }
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private:
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FILE* file_;
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void* memory_;
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int size_;
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};
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OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
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FILE* file = fopen(name, "r+");
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if (file == NULL) return NULL;
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fseek(file, 0, SEEK_END);
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int size = ftell(file);
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void* memory =
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mmap(OS::GetRandomMmapAddr(),
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size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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fileno(file),
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0);
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return new PosixMemoryMappedFile(file, memory, size);
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}
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OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
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void* initial) {
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FILE* file = fopen(name, "w+");
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if (file == NULL) return NULL;
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int result = fwrite(initial, size, 1, file);
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if (result < 1) {
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fclose(file);
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return NULL;
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}
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void* memory =
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mmap(OS::GetRandomMmapAddr(),
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size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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fileno(file),
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0);
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return new PosixMemoryMappedFile(file, memory, size);
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}
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PosixMemoryMappedFile::~PosixMemoryMappedFile() {
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if (memory_) OS::Free(memory_, size_);
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fclose(file_);
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}
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void OS::LogSharedLibraryAddresses(Isolate* isolate) {
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// This function assumes that the layout of the file is as follows:
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// hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name]
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// If we encounter an unexpected situation we abort scanning further entries.
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FILE* fp = fopen("/proc/self/maps", "r");
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if (fp == NULL) return;
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// Allocate enough room to be able to store a full file name.
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const int kLibNameLen = FILENAME_MAX + 1;
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char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen));
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// This loop will terminate once the scanning hits an EOF.
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while (true) {
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uintptr_t start, end;
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char attr_r, attr_w, attr_x, attr_p;
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// Parse the addresses and permission bits at the beginning of the line.
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if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break;
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if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break;
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int c;
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if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') {
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// Found a read-only executable entry. Skip characters until we reach
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// the beginning of the filename or the end of the line.
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do {
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c = getc(fp);
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} while ((c != EOF) && (c != '\n') && (c != '/') && (c != '['));
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if (c == EOF) break; // EOF: Was unexpected, just exit.
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// Process the filename if found.
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if ((c == '/') || (c == '[')) {
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// Push the '/' or '[' back into the stream to be read below.
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ungetc(c, fp);
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// Read to the end of the line. Exit if the read fails.
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if (fgets(lib_name, kLibNameLen, fp) == NULL) break;
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// Drop the newline character read by fgets. We do not need to check
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// for a zero-length string because we know that we at least read the
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// '/' or '[' character.
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lib_name[strlen(lib_name) - 1] = '\0';
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} else {
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// No library name found, just record the raw address range.
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snprintf(lib_name, kLibNameLen,
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"%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end);
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}
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LOG(isolate, SharedLibraryEvent(lib_name, start, end));
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} else {
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// Entry not describing executable data. Skip to end of line to set up
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// reading the next entry.
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do {
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c = getc(fp);
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} while ((c != EOF) && (c != '\n'));
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if (c == EOF) break;
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}
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}
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free(lib_name);
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fclose(fp);
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}
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void OS::SignalCodeMovingGC() {
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// Support for ll_prof.py.
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//
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// The Linux profiler built into the kernel logs all mmap's with
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// PROT_EXEC so that analysis tools can properly attribute ticks. We
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// do a mmap with a name known by ll_prof.py and immediately munmap
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// it. This injects a GC marker into the stream of events generated
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// by the kernel and allows us to synchronize V8 code log and the
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// kernel log.
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int size = sysconf(_SC_PAGESIZE);
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FILE* f = fopen(FLAG_gc_fake_mmap, "w+");
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if (f == NULL) {
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OS::PrintError("Failed to open %s\n", FLAG_gc_fake_mmap);
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OS::Abort();
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}
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void* addr = mmap(OS::GetRandomMmapAddr(),
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size,
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#if defined(__native_client__)
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// The Native Client port of V8 uses an interpreter,
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// so code pages don't need PROT_EXEC.
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PROT_READ,
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#else
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PROT_READ | PROT_EXEC,
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#endif
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MAP_PRIVATE,
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fileno(f),
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0);
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ASSERT(addr != MAP_FAILED);
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OS::Free(addr, size);
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fclose(f);
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}
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// Constants used for mmap.
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static const int kMmapFd = -1;
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static const int kMmapFdOffset = 0;
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VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
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VirtualMemory::VirtualMemory(size_t size)
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: address_(ReserveRegion(size)), size_(size) { }
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VirtualMemory::VirtualMemory(size_t size, size_t alignment)
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: address_(NULL), size_(0) {
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ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
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size_t request_size = RoundUp(size + alignment,
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static_cast<intptr_t>(OS::AllocateAlignment()));
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void* reservation = mmap(OS::GetRandomMmapAddr(),
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request_size,
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PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE,
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kMmapFd,
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kMmapFdOffset);
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if (reservation == MAP_FAILED) return;
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Address base = static_cast<Address>(reservation);
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Address aligned_base = RoundUp(base, alignment);
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ASSERT_LE(base, aligned_base);
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// Unmap extra memory reserved before and after the desired block.
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if (aligned_base != base) {
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size_t prefix_size = static_cast<size_t>(aligned_base - base);
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OS::Free(base, prefix_size);
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request_size -= prefix_size;
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}
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size_t aligned_size = RoundUp(size, OS::AllocateAlignment());
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ASSERT_LE(aligned_size, request_size);
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if (aligned_size != request_size) {
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size_t suffix_size = request_size - aligned_size;
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OS::Free(aligned_base + aligned_size, suffix_size);
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request_size -= suffix_size;
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}
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ASSERT(aligned_size == request_size);
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address_ = static_cast<void*>(aligned_base);
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size_ = aligned_size;
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}
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VirtualMemory::~VirtualMemory() {
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if (IsReserved()) {
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bool result = ReleaseRegion(address(), size());
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ASSERT(result);
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USE(result);
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}
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}
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bool VirtualMemory::IsReserved() {
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return address_ != NULL;
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}
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void VirtualMemory::Reset() {
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address_ = NULL;
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size_ = 0;
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}
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bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
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return CommitRegion(address, size, is_executable);
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}
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bool VirtualMemory::Uncommit(void* address, size_t size) {
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return UncommitRegion(address, size);
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}
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bool VirtualMemory::Guard(void* address) {
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OS::Guard(address, OS::CommitPageSize());
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return true;
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}
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void* VirtualMemory::ReserveRegion(size_t size) {
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void* result = mmap(OS::GetRandomMmapAddr(),
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size,
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PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE,
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kMmapFd,
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kMmapFdOffset);
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if (result == MAP_FAILED) return NULL;
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return result;
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}
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bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
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#if defined(__native_client__)
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// The Native Client port of V8 uses an interpreter,
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// so code pages don't need PROT_EXEC.
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int prot = PROT_READ | PROT_WRITE;
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#else
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int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
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#endif
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if (MAP_FAILED == mmap(base,
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size,
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prot,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
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kMmapFd,
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kMmapFdOffset)) {
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return false;
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}
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return true;
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}
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bool VirtualMemory::UncommitRegion(void* base, size_t size) {
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return mmap(base,
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size,
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PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED,
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kMmapFd,
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kMmapFdOffset) != MAP_FAILED;
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}
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bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
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return munmap(base, size) == 0;
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}
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bool VirtualMemory::HasLazyCommits() {
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return true;
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}
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} } // namespace v8::internal
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