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Implement VirtualMemory on FreeBSD to fix build.

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BUG=v8:1807

Review URL: http://codereview.chromium.org/8439068
Patch from Ben Noordhuis <info@bnoordhuis.nl>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9864 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
yangguo@chromium.org 2011-11-03 08:33:06 +00:00
parent 4e4a901d96
commit aaba9d8f9d
1 changed files with 98 additions and 16 deletions
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114
src/platform-freebsd.cc
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@ -333,44 +333,126 @@ int OS::StackWalk(Vector<OS::StackFrame> frames) {
static const int kMmapFd = -1;
static const int kMmapFdOffset = 0;
VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
VirtualMemory::VirtualMemory(size_t size) {
address_ = mmap(NULL, size, PROT_NONE,
MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
kMmapFd, kMmapFdOffset);
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_ANON | MAP_NORESERVE,
kMmapFd,
kMmapFdOffset);
if (reservation == MAP_FAILED) return;
Address base = static_cast<Address>(reservation);
Address 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;
}
VirtualMemory::~VirtualMemory() {
if (IsReserved()) {
if (0 == munmap(address(), size())) address_ = MAP_FAILED;
bool result = ReleaseRegion(address(), size());
ASSERT(result);
USE(result);
}
}
bool VirtualMemory::IsReserved() {
return address_ != MAP_FAILED;
return address_ != NULL;
}
bool VirtualMemory::Commit(void* address, size_t size, bool executable) {
int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0);
if (MAP_FAILED == mmap(address, size, prot,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
kMmapFd, kMmapFdOffset)) {
return false;
}
void VirtualMemory::Reset() {
address_ = NULL;
size_ = 0;
}
UpdateAllocatedSpaceLimits(address, size);
return true;
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 mmap(address, size, PROT_NONE,
return UncommitRegion(address, size);
}
void* VirtualMemory::ReserveRegion(size_t size) {
void* result = mmap(OS::GetRandomMmapAddr(),
size,
PROT_NONE,
MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
kMmapFd,
kMmapFdOffset);
if (result == MAP_FAILED) return NULL;
return result;
}
bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
if (MAP_FAILED == mmap(base,
size,
prot,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
kMmapFd,
kMmapFdOffset)) {
return false;
}
UpdateAllocatedSpaceLimits(base, size);
return true;
}
bool VirtualMemory::UncommitRegion(void* base, size_t size) {
return mmap(base,
size,
PROT_NONE,
MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED,
kMmapFd, kMmapFdOffset) != MAP_FAILED;
kMmapFd,
kMmapFdOffset) != MAP_FAILED;
}
bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
return munmap(base, size) == 0;
}