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ExecutableMemoryHandle.h
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/*
* Copyright (C) 2021-2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#
pragma
once
#
include
<
JavaScriptCore/JSExportMacros.h
>
#
include
<
bmalloc/BPlatform.h
>
#
include
<
wtf/CodePtr.h
>
#
include
<
wtf/RawPointer.h
>
#
if
ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT)
#
include
<
wtf/CodePtr.h
>
#
include
<
wtf/ThreadSafeRefCounted.h
>
#
else
#
include
<
wtf/MetaAllocatorHandle.h
>
#
endif
#
if
BENABLE(LIBPAS) && (OS(DARWIN) || OS(LINUX) || OS(WINDOWS))
#
define
ENABLE_LIBPAS_JIT_HEAP
1
#
endif
namespace
JSC
{
#
if
ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT)
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER
(ExecutableMemoryHandle);
class
ExecutableMemoryHandle
:
public
ThreadSafeRefCounted
<ExecutableMemoryHandle> {
WTF_DEPRECATED_MAKE_FAST_COMPACT_ALLOCATED_WITH_HEAP_IDENTIFIER
(ExecutableMemoryHandle, ExecutableMemoryHandle);
public:
using
MemoryPtr = CodePtr<
WTF
::HandleMemoryPtrTag>;
//
Don't call this directly - for proper accounting it's necessary to call
//
ExecutableAllocator::allocate().
JS_EXPORT_PRIVATE
static
RefPtr<ExecutableMemoryHandle>
createImpl
(
size_t
sizeInBytes);
JS_EXPORT_PRIVATE
~ExecutableMemoryHandle
();
MemoryPtr
start
()
const
{
return
m_start;
}
MemoryPtr
end
()
const
{
return
MemoryPtr::fromUntaggedPtr
(
reinterpret_cast
<
void
*>(
endAsInteger
()));
}
uintptr_t
startAsInteger
()
const
{
return
m_start.
untaggedPtr
<
uintptr_t
>();
}
uintptr_t
endAsInteger
()
const
{
return
startAsInteger
() +
sizeInBytes
();
}
size_t
sizeInBytes
()
const
{
return
m_sizeInBytes; }
bool
containsIntegerAddress
(
uintptr_t
address)
const
{
uintptr_t
startAddress =
startAsInteger
();
uintptr_t
endAddress = startAddress +
sizeInBytes
();
return
address >= startAddress && address < endAddress;
}
bool
contains
(
void
* address)
const
{
return
containsIntegerAddress
(
reinterpret_cast
<
uintptr_t
>(address));
}
JS_EXPORT_PRIVATE
void
shrink
(
size_t
newSizeInBytes);
void
*
key
()
const
{
return
m_start.
untaggedPtr
();
}
void
dump
(PrintStream& out)
const
{
out.
print
(
RawPointer
(
key
()));
}
private:
ExecutableMemoryHandle
(MemoryPtr start,
size_t
sizeInBytes)
: m_sizeInBytes(sizeInBytes)
, m_start(start)
{
ASSERT
(sizeInBytes == m_sizeInBytes);
//
executable memory region does not exceed 4GB.
}
unsigned
m_sizeInBytes;
MemoryPtr m_start;
};
#
else
//
not (ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT))
typedef
WTF
::MetaAllocatorHandle ExecutableMemoryHandle;
#
endif
//
ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT)
}
//
namespace JSC
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