diff options
Diffstat (limited to 'deps/v8/src/platform-macos.cc')
| -rw-r--r-- | deps/v8/src/platform-macos.cc | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/deps/v8/src/platform-macos.cc b/deps/v8/src/platform-macos.cc index 596b0fb040..0b236a5a93 100644 --- a/deps/v8/src/platform-macos.cc +++ b/deps/v8/src/platform-macos.cc @@ -42,6 +42,7 @@ #include <mach/mach.h> #include <mach/semaphore.h> #include <mach/task.h> +#include <mach/vm_statistics.h> #include <sys/time.h> #include <sys/resource.h> #include <sys/types.h> @@ -123,12 +124,22 @@ size_t OS::AllocateAlignment() { } +// Constants used for mmap. +// kMmapFd is used to pass vm_alloc flags to tag the region with the user +// defined tag 255 This helps identify V8-allocated regions in memory analysis +// tools like vmmap(1). +static const int kMmapFd = VM_MAKE_TAG(255); +static const off_t kMmapFdOffset = 0; + + void* OS::Allocate(const size_t requested, size_t* allocated, bool is_executable) { const size_t msize = RoundUp(requested, getpagesize()); int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); - void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); + void* mbase = mmap(NULL, msize, prot, + MAP_PRIVATE | MAP_ANON, + kMmapFd, kMmapFdOffset); if (mbase == MAP_FAILED) { LOG(StringEvent("OS::Allocate", "mmap failed")); return NULL; @@ -280,9 +291,6 @@ int OS::StackWalk(Vector<StackFrame> frames) { } -// Constants used for mmap. -static const int kMmapFd = -1; -static const int kMmapFdOffset = 0; VirtualMemory::VirtualMemory(size_t size) { |