Revision: 9864
Author: [email protected]
Date: Thu Nov 3 01:33:06 2011
Log: Implement VirtualMemory on FreeBSD to fix build.
BUG=v8:1807
Review URL: http://codereview.chromium.org/8439068
Patch from Ben Noordhuis <[email protected]>.
http://code.google.com/p/v8/source/detail?r=9864
Modified:
/branches/bleeding_edge/src/platform-freebsd.cc
=======================================
--- /branches/bleeding_edge/src/platform-freebsd.cc Thu Sep 8 12:57:14 2011
+++ /branches/bleeding_edge/src/platform-freebsd.cc Thu Nov 3 01:33:06 2011
@@ -333,44 +333,126 @@
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,
+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);
+}
+
+
+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)) {
+ kMmapFd,
+ kMmapFdOffset)) {
return false;
}
- UpdateAllocatedSpaceLimits(address, size);
+ UpdateAllocatedSpaceLimits(base, size);
return true;
}
-bool VirtualMemory::Uncommit(void* address, size_t size) {
- return mmap(address, size, PROT_NONE,
+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;
}
--
v8-dev mailing list
[email protected]
http://groups.google.com/group/v8-dev
