From e9360fae1307575a255bb354efb807eb71e9369a Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Sun, 23 Feb 2020 00:26:22 -0500
Subject: Issue #1053 - Remove android support from memory

---
 memory/volatile/VolatileBuffer.h             |   4 +-
 memory/volatile/VolatileBufferAshmem.cpp     | 139 ---------------------------
 memory/volatile/moz.build                    |  22 +----
 memory/volatile/tests/TestVolatileBuffer.cpp |   8 +-
 4 files changed, 7 insertions(+), 166 deletions(-)
 delete mode 100644 memory/volatile/VolatileBufferAshmem.cpp

(limited to 'memory/volatile')

diff --git a/memory/volatile/VolatileBuffer.h b/memory/volatile/VolatileBuffer.h
index ebb471332..b6bcdfcb7 100644
--- a/memory/volatile/VolatileBuffer.h
+++ b/memory/volatile/VolatileBuffer.h
@@ -76,9 +76,7 @@ private:
   void* mBuf;
   size_t mSize;
   int mLockCount;
-#if defined(ANDROID)
-  int mFd;
-#elif defined(XP_DARWIN)
+#ifdef XP_DARWIN
   bool mHeap;
 #elif defined(XP_WIN)
   bool mHeap;
diff --git a/memory/volatile/VolatileBufferAshmem.cpp b/memory/volatile/VolatileBufferAshmem.cpp
deleted file mode 100644
index 09904d6ef..000000000
--- a/memory/volatile/VolatileBufferAshmem.cpp
+++ /dev/null
@@ -1,139 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "VolatileBuffer.h"
-#include "mozilla/Assertions.h"
-#include "mozilla/mozalloc.h"
-
-#include <fcntl.h>
-#include <linux/ashmem.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#ifdef MOZ_MEMORY
-extern "C" int posix_memalign(void** memptr, size_t alignment, size_t size);
-#endif
-
-#define MIN_VOLATILE_ALLOC_SIZE 8192
-
-namespace mozilla {
-
-VolatileBuffer::VolatileBuffer()
-  : mMutex("VolatileBuffer")
-  , mBuf(nullptr)
-  , mSize(0)
-  , mLockCount(0)
-  , mFd(-1)
-{
-}
-
-bool
-VolatileBuffer::Init(size_t aSize, size_t aAlignment)
-{
-  MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
-  MOZ_ASSERT(!(aAlignment % sizeof(void *)),
-         "Alignment must be multiple of pointer size");
-
-  mSize = aSize;
-  if (aSize < MIN_VOLATILE_ALLOC_SIZE) {
-    goto heap_alloc;
-  }
-
-  mFd = open("/" ASHMEM_NAME_DEF, O_RDWR);
-  if (mFd < 0) {
-    goto heap_alloc;
-  }
-
-  if (ioctl(mFd, ASHMEM_SET_SIZE, mSize) < 0) {
-    goto heap_alloc;
-  }
-
-  mBuf = mmap(nullptr, mSize, PROT_READ | PROT_WRITE, MAP_SHARED, mFd, 0);
-  if (mBuf != MAP_FAILED) {
-    return true;
-  }
-
-heap_alloc:
-  mBuf = nullptr;
-  if (mFd >= 0) {
-    close(mFd);
-    mFd = -1;
-  }
-
-#ifdef MOZ_MEMORY
-  posix_memalign(&mBuf, aAlignment, aSize);
-#else
-  mBuf = memalign(aAlignment, aSize);
-#endif
-  return !!mBuf;
-}
-
-VolatileBuffer::~VolatileBuffer()
-{
-  MOZ_ASSERT(mLockCount == 0, "Being destroyed with non-zero lock count?");
-
-  if (OnHeap()) {
-    free(mBuf);
-  } else {
-    munmap(mBuf, mSize);
-    close(mFd);
-  }
-}
-
-bool
-VolatileBuffer::Lock(void** aBuf)
-{
-  MutexAutoLock lock(mMutex);
-
-  MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer");
-
-  *aBuf = mBuf;
-  if (++mLockCount > 1 || OnHeap()) {
-    return true;
-  }
-
-  // Zero offset and zero length means we want to pin/unpin the entire thing.
-  struct ashmem_pin pin = { 0, 0 };
-  return ioctl(mFd, ASHMEM_PIN, &pin) == ASHMEM_NOT_PURGED;
-}
-
-void
-VolatileBuffer::Unlock()
-{
-  MutexAutoLock lock(mMutex);
-
-  MOZ_ASSERT(mLockCount > 0, "VolatileBuffer unlocked too many times!");
-  if (--mLockCount || OnHeap()) {
-    return;
-  }
-
-  struct ashmem_pin pin = { 0, 0 };
-  ioctl(mFd, ASHMEM_UNPIN, &pin);
-}
-
-bool
-VolatileBuffer::OnHeap() const
-{
-  return mFd < 0;
-}
-
-size_t
-VolatileBuffer::HeapSizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
-{
-  return OnHeap() ? aMallocSizeOf(mBuf) : 0;
-}
-
-size_t
-VolatileBuffer::NonHeapSizeOfExcludingThis() const
-{
-  if (OnHeap()) {
-    return 0;
-  }
-
-  return (mSize + (PAGE_SIZE - 1)) & PAGE_MASK;
-}
-
-} // namespace mozilla
diff --git a/memory/volatile/moz.build b/memory/volatile/moz.build
index deacdf433..5132237a2 100644
--- a/memory/volatile/moz.build
+++ b/memory/volatile/moz.build
@@ -5,26 +5,14 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 NO_VISIBILITY_FLAGS = True
 
-EXPORTS.mozilla += [
-    'VolatileBuffer.h',
-]
+EXPORTS.mozilla += ['VolatileBuffer.h']
 
-if CONFIG['OS_TARGET'] == 'Android':
-    UNIFIED_SOURCES += [
-        'VolatileBufferAshmem.cpp',
-    ]
-elif CONFIG['OS_TARGET'] == 'Darwin':
-    UNIFIED_SOURCES += [
-        'VolatileBufferOSX.cpp',
-    ]
+if CONFIG['OS_TARGET'] == 'Darwin':
+    UNIFIED_SOURCES += ['VolatileBufferOSX.cpp']
 elif CONFIG['OS_TARGET'] == 'WINNT':
-    UNIFIED_SOURCES += [
-        'VolatileBufferWindows.cpp',
-    ]
+    UNIFIED_SOURCES += ['VolatileBufferWindows.cpp']
 else:
-    UNIFIED_SOURCES += [
-        'VolatileBufferFallback.cpp',
-    ]
+    UNIFIED_SOURCES += ['VolatileBufferFallback.cpp']
 
 FINAL_LIBRARY = 'xul'
 
diff --git a/memory/volatile/tests/TestVolatileBuffer.cpp b/memory/volatile/tests/TestVolatileBuffer.cpp
index dff8e794a..7d21236a4 100644
--- a/memory/volatile/tests/TestVolatileBuffer.cpp
+++ b/memory/volatile/tests/TestVolatileBuffer.cpp
@@ -6,13 +6,7 @@
 #include "mozilla/VolatileBuffer.h"
 #include <string.h>
 
-#if defined(ANDROID)
-#include <fcntl.h>
-#include <linux/ashmem.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#elif defined(XP_DARWIN)
+#ifdef XP_DARWIN
 #include <mach/mach.h>
 #endif
 
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