Use the new ScopedMachVM class and the MACH_LOG family of logging macros

where it makes sense to do so in existing code.

This migration shook out a couple of bugs in mach_logging.h carried over
from mac_logging.h (fixed there too).

R=rsesek@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/278923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269829 0039d316-1c4b-4281-b951-d872f2087c98

12 files changed, 187 insertions, 148 deletions

diff --git a/base/base.gypi b/base/base.gypi
index 520f567..86354ae4 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -829,8 +829,10 @@
               ['include', '^mac/bundle_locations\\.'],
               ['include', '^mac/foundation_util\\.'],
               ['include', '^mac/mac_logging\\.'],
+              ['include', '^mac/mach_logging\\.'],
               ['include', '^mac/objc_property_releaser\\.'],
               ['include', '^mac/scoped_mach_port\\.'],
+              ['include', '^mac/scoped_mach_vm\\.'],
               ['include', '^mac/scoped_nsautorelease_pool\\.'],
               ['include', '^mac/scoped_nsobject\\.'],
               ['include', '^memory/discardable_memory_mac\\.'],
diff --git a/base/mac/mac_logging.h b/base/mac/mac_logging.h
index 02f205d..1081490 100644
--- a/base/mac/mac_logging.h
+++ b/base/mac/mac_logging.h
@@ -5,6 +5,8 @@
 #ifndef BASE_MAC_MAC_LOGGING_H_
 #define BASE_MAC_MAC_LOGGING_H_
 
+#include "base/base_export.h"
+#include "base/basictypes.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 
@@ -43,6 +45,12 @@ class BASE_EXPORT OSStatusLogMessage : public logging::LogMessage {
 
 }  // namespace logging
 
+#if defined(NDEBUG)
+#define MAC_DVLOG_IS_ON(verbose_level) 0
+#else
+#define MAC_DVLOG_IS_ON(verbose_level) VLOG_IS_ON(verbose_level)
+#endif
+
 #define OSSTATUS_LOG_STREAM(severity, status) \
     COMPACT_GOOGLE_LOG_EX_ ## severity(OSStatusLogMessage, status).stream()
 #define OSSTATUS_VLOG_STREAM(verbose_level, status) \
@@ -74,10 +82,10 @@ class BASE_EXPORT OSStatusLogMessage : public logging::LogMessage {
 
 #define OSSTATUS_DVLOG(verbose_level, status) \
     LAZY_STREAM(OSSTATUS_VLOG_STREAM(verbose_level, status), \
-                DVLOG_IS_ON(verbose_level))
+                MAC_DVLOG_IS_ON(verbose_level))
 #define OSSTATUS_DVLOG_IF(verbose_level, condition, status) \
-    LAZY_STREAM(OSSTATUS_VLOG_STREAM(verbose_level, status) \
-                DVLOG_IS_ON(verbose_level) && (condition))
+    LAZY_STREAM(OSSTATUS_VLOG_STREAM(verbose_level, status), \
+                MAC_DVLOG_IS_ON(verbose_level) && (condition))
 
 #define OSSTATUS_DCHECK(condition, status) \
     LAZY_STREAM(OSSTATUS_LOG_STREAM(FATAL, status), \
diff --git a/base/mac/mach_logging.cc b/base/mac/mach_logging.cc
index 0ab6416..c5ff85e 100644
--- a/base/mac/mach_logging.cc
+++ b/base/mac/mach_logging.cc
@@ -4,13 +4,15 @@
 
 #include "base/mac/mach_logging.h"
 
-#include <servers/bootstrap.h>
-
 #include <iomanip>
 #include <string>
 
 #include "base/strings/stringprintf.h"
 
+#if !defined(OS_IOS)
+#include <servers/bootstrap.h>
+#endif  // !OS_IOS
+
 namespace {
 
 std::string FormatMachErrorNumber(mach_error_t mach_err) {
@@ -41,6 +43,8 @@ MachLogMessage::~MachLogMessage() {
            << FormatMachErrorNumber(mach_err_);
 }
 
+#if !defined(OS_IOS)
+
 BootstrapLogMessage::BootstrapLogMessage(const char* file_path,
                                          int line,
                                          LogSeverity severity,
@@ -78,4 +82,6 @@ BootstrapLogMessage::~BootstrapLogMessage() {
   }
 }
 
+#endif  // !OS_IOS
+
 }  // namespace logging
diff --git a/base/mac/mach_logging.h b/base/mac/mach_logging.h
index 589dde2..a9b3b65 100644
--- a/base/mac/mach_logging.h
+++ b/base/mac/mach_logging.h
@@ -7,8 +7,10 @@
 
 #include <mach/mach.h>
 
+#include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
+#include "build/build_config.h"
 
 // Use the MACH_LOG family of macros along with a mach_error_t (kern_return_t)
 // containing a Mach error. The error value will be decoded so that logged
@@ -26,12 +28,12 @@
 //     MACH_LOG(ERROR, kr) << "mach_timebase_info";
 //   }
 //
-//   kr = mach_vm_deallocate(task, address, size);
-//   MACH_DCHECK(kr == KERN_SUCCESS, kr) << "mach_vm_deallocate";
+//   kr = vm_deallocate(task, address, size);
+//   MACH_DCHECK(kr == KERN_SUCCESS, kr) << "vm_deallocate";
 
 namespace logging {
 
-class MachLogMessage : public logging::LogMessage {
+class BASE_EXPORT MachLogMessage : public logging::LogMessage {
  public:
   MachLogMessage(const char* file_path,
                  int line,
@@ -45,22 +47,14 @@ class MachLogMessage : public logging::LogMessage {
   DISALLOW_COPY_AND_ASSIGN(MachLogMessage);
 };
 
-class BootstrapLogMessage : public logging::LogMessage {
- public:
-  BootstrapLogMessage(const char* file_path,
-                      int line,
-                      LogSeverity severity,
-                      kern_return_t bootstrap_err);
-  ~BootstrapLogMessage();
-
- private:
-  kern_return_t bootstrap_err_;
-
-  DISALLOW_COPY_AND_ASSIGN(BootstrapLogMessage);
-};
-
 }  // namespace logging
 
+#if defined(NDEBUG)
+#define MACH_DVLOG_IS_ON(verbose_level) 0
+#else
+#define MACH_DVLOG_IS_ON(verbose_level) VLOG_IS_ON(verbose_level)
+#endif
+
 #define MACH_LOG_STREAM(severity, mach_err) \
     COMPACT_GOOGLE_LOG_EX_ ## severity(MachLogMessage, mach_err).stream()
 #define MACH_VLOG_STREAM(verbose_level, mach_err) \
@@ -92,16 +86,38 @@ class BootstrapLogMessage : public logging::LogMessage {
 
 #define MACH_DVLOG(verbose_level, mach_err) \
     LAZY_STREAM(MACH_VLOG_STREAM(verbose_level, mach_err), \
-                DVLOG_IS_ON(verbose_level))
+                MACH_DVLOG_IS_ON(verbose_level))
 #define MACH_DVLOG_IF(verbose_level, condition, mach_err) \
-    LAZY_STREAM(MACH_VLOG_STREAM(verbose_level, mach_err) \
-                DVLOG_IS_ON(verbose_level) && (condition))
+    LAZY_STREAM(MACH_VLOG_STREAM(verbose_level, mach_err), \
+                MACH_DVLOG_IS_ON(verbose_level) && (condition))
 
 #define MACH_DCHECK(condition, mach_err) \
     LAZY_STREAM(MACH_LOG_STREAM(FATAL, mach_err), \
                 DCHECK_IS_ON && !(condition)) \
     << "Check failed: " # condition << ". "
 
+#if !defined(OS_IOS)
+
+namespace logging {
+
+class BASE_EXPORT BootstrapLogMessage : public logging::LogMessage {
+ public:
+  BootstrapLogMessage(const char* file_path,
+                      int line,
+                      LogSeverity severity,
+                      kern_return_t bootstrap_err);
+  ~BootstrapLogMessage();
+
+ private:
+  kern_return_t bootstrap_err_;
+
+  DISALLOW_COPY_AND_ASSIGN(BootstrapLogMessage);
+};
+
+}  // namespace logging
+
+#define BOOTSTRAP_DVLOG_IS_ON MACH_DVLOG_IS_ON
+
 #define BOOTSTRAP_LOG_STREAM(severity, bootstrap_err) \
     COMPACT_GOOGLE_LOG_EX_ ## severity(BootstrapLogMessage, \
                                        bootstrap_err).stream()
@@ -136,14 +152,16 @@ class BootstrapLogMessage : public logging::LogMessage {
 
 #define BOOTSTRAP_DVLOG(verbose_level, bootstrap_err) \
     LAZY_STREAM(BOOTSTRAP_VLOG_STREAM(verbose_level, bootstrap_err), \
-                DVLOG_IS_ON(verbose_level))
+                BOOTSTRAP_DVLOG_IS_ON(verbose_level))
 #define BOOTSTRAP_DVLOG_IF(verbose_level, condition, bootstrap_err) \
-    LAZY_STREAM(BOOTSTRAP_VLOG_STREAM(verbose_level, bootstrap_err) \
-                DVLOG_IS_ON(verbose_level) && (condition))
+    LAZY_STREAM(BOOTSTRAP_VLOG_STREAM(verbose_level, bootstrap_err), \
+                BOOTSTRAP_DVLOG_IS_ON(verbose_level) && (condition))
 
 #define BOOTSTRAP_DCHECK(condition, bootstrap_err) \
     LAZY_STREAM(BOOTSTRAP_LOG_STREAM(FATAL, bootstrap_err), \
                 DCHECK_IS_ON && !(condition)) \
     << "Check failed: " # condition << ". "
 
+#endif  // !OS_IOS
+
 #endif  // BASE_MAC_MACH_LOGGING_H_
diff --git a/base/mac/scoped_mach_port.h b/base/mac/scoped_mach_port.h
index cc2ef20..0b2ac7f 100644
--- a/base/mac/scoped_mach_port.h
+++ b/base/mac/scoped_mach_port.h
@@ -7,8 +7,8 @@
 
 #include <mach/mach.h>
 
-#include "base/basictypes.h"
 #include "base/base_export.h"
+#include "base/basictypes.h"
 
 namespace base {
 namespace mac {
diff --git a/base/mac/scoped_mach_vm.cc b/base/mac/scoped_mach_vm.cc
index a9055aa..1c28d9c 100644
--- a/base/mac/scoped_mach_vm.cc
+++ b/base/mac/scoped_mach_vm.cc
@@ -7,21 +7,21 @@
 namespace base {
 namespace mac {
 
-void ScopedMachVM::reset(mach_vm_address_t address, mach_vm_size_t size) {
+void ScopedMachVM::reset(vm_address_t address, vm_size_t size) {
   DCHECK(address % PAGE_SIZE == 0);
   DCHECK(size % PAGE_SIZE == 0);
 
   if (size_) {
     if (address_ < address) {
-      mach_vm_deallocate(mach_task_self(),
-                         address_,
-                         std::min(size_, address - address_));
+      vm_deallocate(mach_task_self(),
+                    address_,
+                    std::min(size_, address - address_));
     }
     if (address_ + size_ > address + size) {
-      mach_vm_address_t deallocate_start = std::max(address_, address + size);
-      mach_vm_deallocate(mach_task_self(),
-                         deallocate_start,
-                         address_ + size_ - deallocate_start);
+      vm_address_t deallocate_start = std::max(address_, address + size);
+      vm_deallocate(mach_task_self(),
+                    deallocate_start,
+                    address_ + size_ - deallocate_start);
     }
   }
 
diff --git a/base/mac/scoped_mach_vm.h b/base/mac/scoped_mach_vm.h
index 065b968..b130a79 100644
--- a/base/mac/scoped_mach_vm.h
+++ b/base/mac/scoped_mach_vm.h
@@ -6,15 +6,15 @@
 #define BASE_MAC_SCOPED_MACH_VM_H_
 
 #include <mach/mach.h>
-#include <mach/mach_vm.h>
 
 #include <algorithm>
 
+#include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
 
 // Use ScopedMachVM to supervise ownership of pages in the current process
-// through the Mach VM subsystem. Pages allocated with mach_vm_allocate can be
+// through the Mach VM subsystem. Pages allocated with vm_allocate can be
 // released when exiting a scope with ScopedMachVM.
 //
 // The Mach VM subsystem operates on a page-by-page basis, and a single VM
@@ -33,10 +33,10 @@
 //
 // Example:
 //
-//   mach_vm_address_t address = 0;
-//   mach_vm_size_t size = 12345;  // This requested size is not page-aligned.
+//   vm_address_t address = 0;
+//   vm_size_t size = 12345;  // This requested size is not page-aligned.
 //   kern_return_t kr =
-//       mach_vm_allocate(mach_task_self(), &address, size, VM_FLAGS_ANYWHERE);
+//       vm_allocate(mach_task_self(), &address, size, VM_FLAGS_ANYWHERE);
 //   if (kr != KERN_SUCCESS) {
 //     return false;
 //   }
@@ -45,9 +45,9 @@
 namespace base {
 namespace mac {
 
-class ScopedMachVM {
+class BASE_EXPORT ScopedMachVM {
  public:
-  explicit ScopedMachVM(mach_vm_address_t address = 0, mach_vm_size_t size = 0)
+  explicit ScopedMachVM(vm_address_t address = 0, vm_size_t size = 0)
       : address_(address),
         size_(size) {
     DCHECK(address % PAGE_SIZE == 0);
@@ -56,17 +56,17 @@ class ScopedMachVM {
 
   ~ScopedMachVM() {
     if (size_) {
-      mach_vm_deallocate(mach_task_self(), address_, size_);
+      vm_deallocate(mach_task_self(), address_, size_);
     }
   }
 
-  void reset(mach_vm_address_t address = 0, mach_vm_size_t size = 0);
+  void reset(vm_address_t address = 0, vm_size_t size = 0);
 
-  mach_vm_address_t address() const {
+  vm_address_t address() const {
     return address_;
   }
 
-  mach_vm_size_t size() const {
+  vm_size_t size() const {
     return size_;
   }
 
@@ -81,8 +81,8 @@ class ScopedMachVM {
   }
 
  private:
-  mach_vm_address_t address_;
-  mach_vm_size_t size_;
+  vm_address_t address_;
+  vm_size_t size_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedMachVM);
 };
diff --git a/base/memory/discardable_memory_mac.cc b/base/memory/discardable_memory_mac.cc
index d7133f5..d8c0ada 100644
--- a/base/memory/discardable_memory_mac.cc
+++ b/base/memory/discardable_memory_mac.cc
@@ -5,12 +5,13 @@
 #include "base/memory/discardable_memory.h"
 
 #include <mach/mach.h>
-#include <sys/mman.h>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
+#include "base/mac/mach_logging.h"
+#include "base/mac/scoped_mach_vm.h"
 #include "base/memory/discardable_memory_emulated.h"
 #include "base/memory/discardable_memory_malloc.h"
 #include "base/memory/discardable_memory_manager.h"
@@ -40,7 +41,9 @@ class DiscardableMemoryMac
       public internal::DiscardableMemoryManagerAllocation {
  public:
   explicit DiscardableMemoryMac(size_t bytes)
-      : buffer_(0), bytes_(bytes), is_locked_(false) {
+      : memory_(0, 0),
+        bytes_(mach_vm_round_page(bytes)),
+        is_locked_(false) {
     g_shared_state.Pointer()->manager.Register(this, bytes);
   }
 
@@ -50,8 +53,6 @@ class DiscardableMemoryMac
     if (is_locked_)
       Unlock();
     g_shared_state.Pointer()->manager.Unregister(this);
-    if (buffer_)
-      vm_deallocate(mach_task_self(), buffer_, bytes_);
   }
 
   // Overridden from DiscardableMemory:
@@ -66,64 +67,78 @@ class DiscardableMemoryMac
     return purged ? DISCARDABLE_MEMORY_LOCK_STATUS_PURGED
                   : DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS;
   }
+
   virtual void Unlock() OVERRIDE {
     DCHECK(is_locked_);
     g_shared_state.Pointer()->manager.ReleaseLock(this);
     is_locked_ = false;
   }
+
   virtual void* Memory() const OVERRIDE {
     DCHECK(is_locked_);
-    return reinterpret_cast<void*>(buffer_);
+    return reinterpret_cast<void*>(memory_.address());
   }
 
   // Overridden from internal::DiscardableMemoryManagerAllocation:
   virtual bool AllocateAndAcquireLock() OVERRIDE {
     bool persistent = true;
-    if (!buffer_) {
-      kern_return_t ret = vm_allocate(
+    kern_return_t ret;
+    if (!memory_.size()) {
+      vm_address_t address = 0;
+      ret = vm_allocate(
           mach_task_self(),
-          &buffer_,
+          &address,
           bytes_,
-          VM_FLAGS_PURGABLE | VM_FLAGS_ANYWHERE | kDiscardableMemoryTag);
-      CHECK_EQ(KERN_SUCCESS, ret) << "wm_allocate() failed.";
+          VM_FLAGS_ANYWHERE | VM_FLAGS_PURGABLE | kDiscardableMemoryTag);
+      MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_allocate";
+      memory_.reset(address, bytes_);
       persistent = false;
     }
+
 #if !defined(NDEBUG)
-    int status = mprotect(
-        reinterpret_cast<void*>(buffer_), bytes_, PROT_READ | PROT_WRITE);
-    DCHECK_EQ(0, status);
+    ret = vm_protect(mach_task_self(),
+                     memory_.address(),
+                     memory_.size(),
+                     FALSE,
+                     VM_PROT_DEFAULT);
+    MACH_DCHECK(ret == KERN_SUCCESS, ret) << "vm_protect";
 #endif
+
     int state = VM_PURGABLE_NONVOLATILE;
-    kern_return_t ret = vm_purgable_control(mach_task_self(),
-                                            buffer_,
-                                            VM_PURGABLE_SET_STATE,
-                                            &state);
-    CHECK_EQ(KERN_SUCCESS, ret) << "Failed to lock memory.";
+    ret = vm_purgable_control(mach_task_self(),
+                              memory_.address(),
+                              VM_PURGABLE_SET_STATE,
+                              &state);
+    MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_purgable_control";
     if (state & VM_PURGABLE_EMPTY)
       persistent = false;
     return persistent;
   }
+
   virtual void ReleaseLock() OVERRIDE {
     int state = VM_PURGABLE_VOLATILE | VM_VOLATILE_GROUP_DEFAULT;
     kern_return_t ret = vm_purgable_control(mach_task_self(),
-                                            buffer_,
+                                            memory_.address(),
                                             VM_PURGABLE_SET_STATE,
                                             &state);
-    CHECK_EQ(KERN_SUCCESS, ret) << "Failed to unlock memory.";
+    MACH_CHECK(ret == KERN_SUCCESS, ret) << "vm_purgable_control";
+
 #if !defined(NDEBUG)
-    int status = mprotect(reinterpret_cast<void*>(buffer_), bytes_, PROT_NONE);
-    DCHECK_EQ(0, status);
+    ret = vm_protect(mach_task_self(),
+                     memory_.address(),
+                     memory_.size(),
+                     FALSE,
+                     VM_PROT_NONE);
+    MACH_DCHECK(ret == KERN_SUCCESS, ret) << "vm_protect";
 #endif
   }
+
   virtual void Purge() OVERRIDE {
-    if (buffer_) {
-      vm_deallocate(mach_task_self(), buffer_, bytes_);
-      buffer_ = 0;
-    }
+    memory_.reset();
   }
 
  private:
-  vm_address_t buffer_;
+  mac::ScopedMachVM memory_;
   const size_t bytes_;
   bool is_locked_;
 
diff --git a/base/process/memory_mac.mm b/base/process/memory_mac.mm
index 6cf1297..8503bbb 100644
--- a/base/process/memory_mac.mm
+++ b/base/process/memory_mac.mm
@@ -16,6 +16,7 @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
+#include "base/mac/mach_logging.h"
 #include "base/scoped_clear_errno.h"
 #include "third_party/apple_apsl/CFBase.h"
 #include "third_party/apple_apsl/malloc.h"
@@ -222,10 +223,12 @@ void DeprotectMallocZone(ChromeMallocZone* default_zone,
                      reinterpret_cast<vm_region_info_t>(&info),
                      &count,
                      &unused);
-  CHECK(result == KERN_SUCCESS);
+  MACH_CHECK(result == KERN_SUCCESS, result) << "mach_vm_region";
 
-  result = mach_port_deallocate(mach_task_self(), unused);
-  CHECK(result == KERN_SUCCESS);
+  // The kernel always returns a null object for VM_REGION_BASIC_INFO_64, but
+  // balance it with a deallocate in case this ever changes. See 10.9.2
+  // xnu-2422.90.20/osfmk/vm/vm_map.c vm_map_region.
+  mach_port_deallocate(mach_task_self(), unused);
 
   // Does the region fully enclose the zone pointers? Possibly unwarranted
   // simplification used: using the size of a full version 8 malloc zone rather
@@ -248,7 +251,7 @@ void DeprotectMallocZone(ChromeMallocZone* default_zone,
                              *reprotection_length,
                              false,
                              info.protection | VM_PROT_WRITE);
-    CHECK(result == KERN_SUCCESS);
+    MACH_CHECK(result == KERN_SUCCESS, result) << "mach_vm_protect";
   }
 }
 
@@ -646,7 +649,7 @@ void EnableTerminationOnOutOfMemory() {
                                            default_reprotection_length,
                                            false,
                                            default_reprotection_value);
-    CHECK(result == KERN_SUCCESS);
+    MACH_CHECK(result == KERN_SUCCESS, result) << "mach_vm_protect";
   }
 
   if (purgeable_reprotection_start) {
@@ -655,7 +658,7 @@ void EnableTerminationOnOutOfMemory() {
                                            purgeable_reprotection_length,
                                            false,
                                            purgeable_reprotection_value);
-    CHECK(result == KERN_SUCCESS);
+    MACH_CHECK(result == KERN_SUCCESS, result) << "mach_vm_protect";
   }
 #endif
 
diff --git a/base/process/process_metrics_mac.cc b/base/process/process_metrics_mac.cc
index 1b2e61b..ee79583 100644
--- a/base/process/process_metrics_mac.cc
+++ b/base/process/process_metrics_mac.cc
@@ -11,6 +11,7 @@
 
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
+#include "base/mac/mach_logging.h"
 #include "base/mac/scoped_mach_port.h"
 #include "base/sys_info.h"
 
@@ -116,7 +117,6 @@ size_t ProcessMetrics::GetPeakWorkingSetSize() const {
 // shared_bytes is the size of shared resident memory.
 bool ProcessMetrics::GetMemoryBytes(size_t* private_bytes,
                                     size_t* shared_bytes) {
-  kern_return_t kr;
   size_t private_pages_count = 0;
   size_t shared_pages_count = 0;
 
@@ -153,22 +153,26 @@ bool ProcessMetrics::GetMemoryBytes(size_t* private_bytes,
     vm_region_top_info_data_t info;
     mach_msg_type_number_t info_count = VM_REGION_TOP_INFO_COUNT;
     mach_port_t object_name;
-    kr = mach_vm_region(task,
-                        &address,
-                        &size,
-                        VM_REGION_TOP_INFO,
-                        (vm_region_info_t)&info,
-                        &info_count,
-                        &object_name);
+    kern_return_t kr = mach_vm_region(task,
+                                      &address,
+                                      &size,
+                                      VM_REGION_TOP_INFO,
+                                      reinterpret_cast<vm_region_info_t>(&info),
+                                      &info_count,
+                                      &object_name);
     if (kr == KERN_INVALID_ADDRESS) {
       // We're at the end of the address space.
       break;
     } else if (kr != KERN_SUCCESS) {
-      DLOG(ERROR) << "Calling mach_vm_region failed with error: "
-                 << mach_error_string(kr);
+      MACH_DLOG(ERROR, kr) << "mach_vm_region";
       return false;
     }
 
+    // The kernel always returns a null object for VM_REGION_TOP_INFO, but
+    // balance it with a deallocate in case this ever changes. See 10.9.2
+    // xnu-2422.90.20/osfmk/vm/vm_map.c vm_map_region.
+    mach_port_deallocate(mach_task_self(), object_name);
+
     if (IsAddressInSharedRegion(address, cpu_type) &&
         info.share_mode != SM_PRIVATE)
       continue;
@@ -196,18 +200,10 @@ bool ProcessMetrics::GetMemoryBytes(size_t* private_bytes,
     }
   }
 
-  vm_size_t page_size;
-  kr = host_page_size(task, &page_size);
-  if (kr != KERN_SUCCESS) {
-    DLOG(ERROR) << "Failed to fetch host page size, error: "
-               << mach_error_string(kr);
-    return false;
-  }
-
   if (private_bytes)
-    *private_bytes = private_pages_count * page_size;
+    *private_bytes = private_pages_count * PAGE_SIZE;
   if (shared_bytes)
-    *shared_bytes = shared_pages_count * page_size;
+    *shared_bytes = shared_pages_count * PAGE_SIZE;
 
   return true;
 }
@@ -235,16 +231,14 @@ double ProcessMetrics::GetCPUUsage() {
   if (task == MACH_PORT_NULL)
     return 0;
 
-  kern_return_t kr;
-
   // Libtop explicitly loops over the threads (libtop_pinfo_update_cpu_usage()
   // in libtop.c), but this is more concise and gives the same results:
   task_thread_times_info thread_info_data;
   mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT;
-  kr = task_info(task,
-                 TASK_THREAD_TIMES_INFO,
-                 reinterpret_cast<task_info_t>(&thread_info_data),
-                 &thread_info_count);
+  kern_return_t kr = task_info(task,
+                               TASK_THREAD_TIMES_INFO,
+                               reinterpret_cast<task_info_t>(&thread_info_data),
+                               &thread_info_count);
   if (kr != KERN_SUCCESS) {
     // Most likely cause: |task| is a zombie.
     return 0;
@@ -294,14 +288,12 @@ int ProcessMetrics::GetIdleWakeupsPerSecond() {
   if (task == MACH_PORT_NULL)
     return 0;
 
-  kern_return_t kr;
-
   task_power_info power_info_data;
   mach_msg_type_number_t power_info_count = TASK_POWER_INFO_COUNT;
-  kr = task_info(task,
-                 TASK_POWER_INFO,
-                 reinterpret_cast<task_info_t>(&power_info_data),
-                 &power_info_count);
+  kern_return_t kr = task_info(task,
+                               TASK_POWER_INFO,
+                               reinterpret_cast<task_info_t>(&power_info_data),
+                               &power_info_count);
   if (kr != KERN_SUCCESS) {
     // Most likely cause: |task| is a zombie, or this is on a pre-10.8.4 system
     // where TASK_POWER_INFO isn't supported yet.
@@ -362,19 +354,12 @@ size_t GetSystemCommitCharge() {
   kern_return_t kr = host_statistics(host, HOST_VM_INFO,
                                      reinterpret_cast<host_info_t>(&data),
                                      &count);
-  if (kr) {
-    DLOG(WARNING) << "Failed to fetch host statistics.";
-    return 0;
-  }
-
-  vm_size_t page_size;
-  kr = host_page_size(host, &page_size);
-  if (kr) {
-    DLOG(ERROR) << "Failed to fetch host page size.";
+  if (kr != KERN_SUCCESS) {
+    MACH_DLOG(WARNING, kr) << "host_statistics";
     return 0;
   }
 
-  return (data.active_count * page_size) / 1024;
+  return (data.active_count * PAGE_SIZE) / 1024;
 }
 
 }  // namespace base
diff --git a/base/threading/platform_thread_mac.mm b/base/threading/platform_thread_mac.mm
index 486181f..147e625 100644
--- a/base/threading/platform_thread_mac.mm
+++ b/base/threading/platform_thread_mac.mm
@@ -14,6 +14,7 @@
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
+#include "base/mac/mach_logging.h"
 #include "base/threading/thread_id_name_manager.h"
 #include "base/tracked_objects.h"
 
@@ -61,20 +62,19 @@ void SetPriorityNormal(mach_port_t mach_thread_id) {
   // Please note that this call could fail in rare cases depending
   // on runtime conditions.
   thread_standard_policy policy;
-  kern_return_t result = thread_policy_set(mach_thread_id,
-                                           THREAD_STANDARD_POLICY,
-                                           (thread_policy_t)&policy,
-                                           THREAD_STANDARD_POLICY_COUNT);
+  kern_return_t result =
+      thread_policy_set(mach_thread_id,
+                        THREAD_STANDARD_POLICY,
+                        reinterpret_cast<thread_policy_t>(&policy),
+                        THREAD_STANDARD_POLICY_COUNT);
 
   if (result != KERN_SUCCESS)
-    DVLOG(1) << "thread_policy_set() failure: " << result;
+    MACH_DVLOG(1, result) << "thread_policy_set";
 }
 
 // Enables time-contraint policy and priority suitable for low-latency,
 // glitch-resistant audio.
 void SetPriorityRealtimeAudio(mach_port_t mach_thread_id) {
-  kern_return_t result;
-
   // Increase thread priority to real-time.
 
   // Please note that the thread_policy_set() calls may fail in
@@ -85,12 +85,13 @@ void SetPriorityRealtimeAudio(mach_port_t mach_thread_id) {
   // Make thread fixed priority.
   thread_extended_policy_data_t policy;
   policy.timeshare = 0;  // Set to 1 for a non-fixed thread.
-  result = thread_policy_set(mach_thread_id,
-                             THREAD_EXTENDED_POLICY,
-                             (thread_policy_t)&policy,
-                             THREAD_EXTENDED_POLICY_COUNT);
+  kern_return_t result =
+      thread_policy_set(mach_thread_id,
+                        THREAD_EXTENDED_POLICY,
+                        reinterpret_cast<thread_policy_t>(&policy),
+                        THREAD_EXTENDED_POLICY_COUNT);
   if (result != KERN_SUCCESS) {
-    DVLOG(1) << "thread_policy_set() failure: " << result;
+    MACH_DVLOG(1, result) << "thread_policy_set";
     return;
   }
 
@@ -99,10 +100,10 @@ void SetPriorityRealtimeAudio(mach_port_t mach_thread_id) {
   precedence.importance = 63;
   result = thread_policy_set(mach_thread_id,
                              THREAD_PRECEDENCE_POLICY,
-                             (thread_policy_t)&precedence,
+                             reinterpret_cast<thread_policy_t>(&precedence),
                              THREAD_PRECEDENCE_POLICY_COUNT);
   if (result != KERN_SUCCESS) {
-    DVLOG(1) << "thread_policy_set() failure: " << result;
+    MACH_DVLOG(1, result) << "thread_policy_set";
     return;
   }
 
@@ -133,7 +134,7 @@ void SetPriorityRealtimeAudio(mach_port_t mach_thread_id) {
   mach_timebase_info_data_t tb_info;
   mach_timebase_info(&tb_info);
   double ms_to_abs_time =
-      ((double)tb_info.denom / (double)tb_info.numer) * 1000000;
+      (static_cast<double>(tb_info.denom) / tb_info.numer) * 1000000;
 
   thread_time_constraint_policy_data_t time_constraints;
   time_constraints.period = kTimeQuantum * ms_to_abs_time;
@@ -141,12 +142,12 @@ void SetPriorityRealtimeAudio(mach_port_t mach_thread_id) {
   time_constraints.constraint = kMaxTimeAllowed * ms_to_abs_time;
   time_constraints.preemptible = 0;
 
-  result = thread_policy_set(mach_thread_id,
-                             THREAD_TIME_CONSTRAINT_POLICY,
-                             (thread_policy_t)&time_constraints,
-                             THREAD_TIME_CONSTRAINT_POLICY_COUNT);
-  if (result != KERN_SUCCESS)
-    DVLOG(1) << "thread_policy_set() failure: " << result;
+  result =
+      thread_policy_set(mach_thread_id,
+                        THREAD_TIME_CONSTRAINT_POLICY,
+                        reinterpret_cast<thread_policy_t>(&time_constraints),
+                        THREAD_TIME_CONSTRAINT_POLICY_COUNT);
+  MACH_DVLOG_IF(1, result != KERN_SUCCESS, result) << "thread_policy_set";
 
   return;
 }
diff --git a/base/time/time_mac.cc b/base/time/time_mac.cc
index 6089efb..515cafe 100644
--- a/base/time/time_mac.cc
+++ b/base/time/time_mac.cc
@@ -15,6 +15,7 @@
 
 #include "base/basictypes.h"
 #include "base/logging.h"
+#include "base/mac/mach_logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_mach_port.h"
 
@@ -46,7 +47,7 @@ uint64_t ComputeCurrentTicks() {
     // whether mach_timebase_info has already been called.  This is
     // recommended by Apple's QA1398.
     kern_return_t kr = mach_timebase_info(&timebase_info);
-    DCHECK_EQ(KERN_SUCCESS, kr);
+    MACH_DCHECK(kr == KERN_SUCCESS, kr) << "mach_timebase_info";
   }
 
   // mach_absolute_time is it when it comes to ticks on the Mac.  Other calls
@@ -85,7 +86,7 @@ uint64_t ComputeThreadTicks() {
       THREAD_BASIC_INFO,
       reinterpret_cast<thread_info_t>(&thread_info_data),
       &thread_info_count);
-  DCHECK_EQ(KERN_SUCCESS, kr);
+  MACH_DCHECK(kr == KERN_SUCCESS, kr) << "thread_info";
 
   return (thread_info_data.user_time.seconds *
               base::Time::kMicrosecondsPerSecond) +