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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Platform-specific code for Solaris 10 goes here. For the POSIX-compatible
      6 // parts, the implementation is in platform-posix.cc.
      7 
      8 #ifdef __sparc
      9 # error "V8 does not support the SPARC CPU architecture."
     10 #endif
     11 
     12 #include <dlfcn.h>  // dladdr
     13 #include <errno.h>
     14 #include <ieeefp.h>  // finite()
     15 #include <pthread.h>
     16 #include <semaphore.h>
     17 #include <signal.h>  // sigemptyset(), etc
     18 #include <sys/mman.h>  // mmap()
     19 #include <sys/regset.h>
     20 #include <sys/stack.h>  // for stack alignment
     21 #include <sys/time.h>  // gettimeofday(), timeradd()
     22 #include <time.h>
     23 #include <ucontext.h>  // walkstack(), getcontext()
     24 #include <unistd.h>  // getpagesize(), usleep()
     25 
     26 #include <cmath>
     27 
     28 #undef MAP_TYPE
     29 
     30 #include "src/base/macros.h"
     31 #include "src/base/platform/platform.h"
     32 
     33 
     34 namespace v8 {
     35 namespace base {
     36 
     37 
     38 const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
     39   if (std::isnan(time)) return "";
     40   time_t tv = static_cast<time_t>(std::floor(time/msPerSecond));
     41   struct tm tm;
     42   struct tm* t = localtime_r(&tv, &tm);
     43   if (NULL == t) return "";
     44   return tzname[0];  // The location of the timezone string on Solaris.
     45 }
     46 
     47 
     48 double OS::LocalTimeOffset(TimezoneCache* cache) {
     49   tzset();
     50   return -static_cast<double>(timezone * msPerSecond);
     51 }
     52 
     53 
     54 void* OS::Allocate(const size_t requested,
     55                    size_t* allocated,
     56                    bool is_executable) {
     57   const size_t msize = RoundUp(requested, getpagesize());
     58   int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
     59   void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0);
     60 
     61   if (mbase == MAP_FAILED) return NULL;
     62   *allocated = msize;
     63   return mbase;
     64 }
     65 
     66 
     67 std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
     68   return std::vector<SharedLibraryAddress>();
     69 }
     70 
     71 
     72 void OS::SignalCodeMovingGC() {
     73 }
     74 
     75 
     76 // Constants used for mmap.
     77 static const int kMmapFd = -1;
     78 static const int kMmapFdOffset = 0;
     79 
     80 
     81 VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
     82 
     83 
     84 VirtualMemory::VirtualMemory(size_t size)
     85     : address_(ReserveRegion(size)), size_(size) { }
     86 
     87 
     88 VirtualMemory::VirtualMemory(size_t size, size_t alignment)
     89     : address_(NULL), size_(0) {
     90   DCHECK((alignment % OS::AllocateAlignment()) == 0);
     91   size_t request_size = RoundUp(size + alignment,
     92                                 static_cast<intptr_t>(OS::AllocateAlignment()));
     93   void* reservation = mmap(OS::GetRandomMmapAddr(),
     94                            request_size,
     95                            PROT_NONE,
     96                            MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE,
     97                            kMmapFd,
     98                            kMmapFdOffset);
     99   if (reservation == MAP_FAILED) return;
    100 
    101   uint8_t* base = static_cast<uint8_t*>(reservation);
    102   uint8_t* aligned_base = RoundUp(base, alignment);
    103   DCHECK_LE(base, aligned_base);
    104 
    105   // Unmap extra memory reserved before and after the desired block.
    106   if (aligned_base != base) {
    107     size_t prefix_size = static_cast<size_t>(aligned_base - base);
    108     OS::Free(base, prefix_size);
    109     request_size -= prefix_size;
    110   }
    111 
    112   size_t aligned_size = RoundUp(size, OS::AllocateAlignment());
    113   DCHECK_LE(aligned_size, request_size);
    114 
    115   if (aligned_size != request_size) {
    116     size_t suffix_size = request_size - aligned_size;
    117     OS::Free(aligned_base + aligned_size, suffix_size);
    118     request_size -= suffix_size;
    119   }
    120 
    121   DCHECK(aligned_size == request_size);
    122 
    123   address_ = static_cast<void*>(aligned_base);
    124   size_ = aligned_size;
    125 }
    126 
    127 
    128 VirtualMemory::~VirtualMemory() {
    129   if (IsReserved()) {
    130     bool result = ReleaseRegion(address(), size());
    131     DCHECK(result);
    132     USE(result);
    133   }
    134 }
    135 
    136 
    137 bool VirtualMemory::IsReserved() {
    138   return address_ != NULL;
    139 }
    140 
    141 
    142 void VirtualMemory::Reset() {
    143   address_ = NULL;
    144   size_ = 0;
    145 }
    146 
    147 
    148 bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
    149   return CommitRegion(address, size, is_executable);
    150 }
    151 
    152 
    153 bool VirtualMemory::Uncommit(void* address, size_t size) {
    154   return UncommitRegion(address, size);
    155 }
    156 
    157 
    158 bool VirtualMemory::Guard(void* address) {
    159   OS::Guard(address, OS::CommitPageSize());
    160   return true;
    161 }
    162 
    163 
    164 void* VirtualMemory::ReserveRegion(size_t size) {
    165   void* result = mmap(OS::GetRandomMmapAddr(),
    166                       size,
    167                       PROT_NONE,
    168                       MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE,
    169                       kMmapFd,
    170                       kMmapFdOffset);
    171 
    172   if (result == MAP_FAILED) return NULL;
    173 
    174   return result;
    175 }
    176 
    177 
    178 bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
    179   int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
    180   if (MAP_FAILED == mmap(base,
    181                          size,
    182                          prot,
    183                          MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
    184                          kMmapFd,
    185                          kMmapFdOffset)) {
    186     return false;
    187   }
    188   return true;
    189 }
    190 
    191 
    192 bool VirtualMemory::UncommitRegion(void* base, size_t size) {
    193   return mmap(base,
    194               size,
    195               PROT_NONE,
    196               MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED,
    197               kMmapFd,
    198               kMmapFdOffset) != MAP_FAILED;
    199 }
    200 
    201 bool VirtualMemory::ReleasePartialRegion(void* base, size_t size,
    202                                          void* free_start, size_t free_size) {
    203   return munmap(free_start, free_size) == 0;
    204 }
    205 
    206 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
    207   return munmap(base, size) == 0;
    208 }
    209 
    210 
    211 bool VirtualMemory::HasLazyCommits() {
    212   // TODO(alph): implement for the platform.
    213   return false;
    214 }
    215 
    216 }  // namespace base
    217 }  // namespace v8
    218