PageReservation.h

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PageReservation.h

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/home/opencoverage/opencoverage/guest-scripts/qtdeclarative/src/qtdeclarative/src/3rdparty/masm/wtf/PageReservation.h

Line	Source	Count
1	/*	-
2	* Copyright (C) 2010 Apple Inc. All rights reserved.	-
3	*	-
4	* Redistribution and use in source and binary forms, with or without	-
5	* modification, are permitted provided that the following conditions	-
6	* are met:	-
7	* 1. Redistributions of source code must retain the above copyright	-
8	* notice, this list of conditions and the following disclaimer.	-
9	* 2. Redistributions in binary form must reproduce the above copyright	-
10	* notice, this list of conditions and the following disclaimer in the	-
11	* documentation and/or other materials provided with the distribution.	-
12	*	-
13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY	-
14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE	-
15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR	-
16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR	-
17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,	-
18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,	-
19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR	-
20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY	-
21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	-
22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE	-
23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	-
24	*/	-
25		-
26	#ifndef PageReservation_h	-
27	#define PageReservation_h	-
28		-
29	#include <wtf/PageAllocation.h>	-
30		-
31	namespace WTF {	-
32		-
33	/*	-
34	PageReservation	-
35		-
36	Like PageAllocation, the PageReservation class provides a cross-platform memory	-
37	allocation interface, but with a set of capabilities more similar to that of	-
38	VirtualAlloc than posix mmap. PageReservation can be used to allocate virtual	-
39	memory without committing physical memory pages using PageReservation::reserve.	-
40	Following a call to reserve all memory in the region is in a decommited state,	-
41	in which the memory should not be used (accessing the memory may cause a fault).	-
42		-
43	Before using memory it must be committed by calling commit, which is passed start	-
44	and size values (both of which require system page size granularity). One the	-
45	committed memory is no longer needed 'decommit' may be called to return the	-
46	memory to its devommitted state. Commit should only be called on memory that is	-
47	currently decommitted, and decommit should only be called on memory regions that	-
48	are currently committed. All memory should be decommited before the reservation	-
49	is deallocated. Values in memory may not be retained accross a pair of calls if	-
50	the region of memory is decommitted and then committed again.	-
51		-
52	Memory protection should not be changed on decommitted memory, and if protection	-
53	is changed on memory while it is committed it should be returned to the orignal	-
54	protection before decommit is called.	-
55	*/	-
56		-
57	class PageReservation : private PageBlock {	-
58	public:	-
59	PageReservation()	-
60	: m_committed(0)	-
61	, m_writable(false)	-
62	, m_executable(false)	-
63	{	-
64	} executed 297753 times by 153 tests: `end of block` Executed by: tst_bindingdependencyapi tst_drawingmodes tst_ecmascripttests tst_examples tst_flickableinterop tst_multipointtoucharea_interop tst_parserstress tst_qjsengine tst_qjsonbinding tst_qjsvalue tst_qjsvalueiterator tst_qmlcachegen tst_qmldiskcache tst_qqmlapplicationengine tst_qqmlbinding tst_qqmlcomponent tst_qqmlconnections tst_qqmlconsole tst_qqmlcontext tst_qqmldebugclient tst_qqmldebugjs tst_qqmldebuglocal tst_qqmldebugservice tst_qqmlecmascript tst_qqmlenginecleanup ...	297753
65		-
66	using PageBlock::base;	-
67	using PageBlock::size;	-
68		-
69	#ifndef __clang__	-
70	using PageBlock::operator bool;	-
71	#else	-
72	// FIXME: This is a workaround for <rdar://problem/8876150>, wherein Clang incorrectly emits an access	-
73	// control warning when a client tries to use operator bool exposed above via "using PageBlock::operator bool".	-
74	operator bool() const { return PageBlock::operator bool(); }	-
75	#endif	-
76		-
77	void commit(void* start, size_t size)	-
78	{	-
79	ASSERT(*this);	-
80	ASSERT(isPageAligned(start));	-
81	ASSERT(isPageAligned(size));	-
82	ASSERT(contains(start, size));	-
83		-
84	m_committed += size;	-
85	OSAllocator::commit(start, size, m_writable, m_executable);	-
86	} executed 499045 times by 153 tests: `end of block` Executed by: tst_bindingdependencyapi tst_drawingmodes tst_ecmascripttests tst_examples tst_flickableinterop tst_multipointtoucharea_interop tst_parserstress tst_qjsengine tst_qjsonbinding tst_qjsvalue tst_qjsvalueiterator tst_qmlcachegen tst_qmldiskcache tst_qqmlapplicationengine tst_qqmlbinding tst_qqmlcomponent tst_qqmlconnections tst_qqmlconsole tst_qqmlcontext tst_qqmldebugclient tst_qqmldebugjs tst_qqmldebuglocal tst_qqmldebugservice tst_qqmlecmascript tst_qqmlenginecleanup ...	499045
87		-
88	void decommit(void* start, size_t size)	-
89	{	-
90	ASSERT(*this);	-
91	ASSERT(isPageAligned(start));	-
92	ASSERT(isPageAligned(size));	-
93	ASSERT(contains(start, size));	-
94		-
95	m_committed -= size;	-
96	OSAllocator::decommit(start, size);	-
97	} executed 498945 times by 153 tests: `end of block` Executed by: tst_bindingdependencyapi tst_drawingmodes tst_ecmascripttests tst_examples tst_flickableinterop tst_multipointtoucharea_interop tst_parserstress tst_qjsengine tst_qjsonbinding tst_qjsvalue tst_qjsvalueiterator tst_qmlcachegen tst_qmldiskcache tst_qqmlapplicationengine tst_qqmlbinding tst_qqmlcomponent tst_qqmlconnections tst_qqmlconsole tst_qqmlcontext tst_qqmldebugclient tst_qqmldebugjs tst_qqmldebuglocal tst_qqmldebugservice tst_qqmlecmascript tst_qqmlenginecleanup ...	498945
98		-
99	size_t committed()	-
100	{	-
101	return m_committed; never executed: `return m_committed;`	0
102	}	-
103		-
104	static PageReservation reserve(size_t size, OSAllocator::Usage usage = OSAllocator::UnknownUsage, bool writable = true, bool executable = false)	-
105	{	-
106	ASSERT(isPageAligned(size));	-
107	return PageReservation(OSAllocator::reserveUncommitted(size, usage, writable, executable), size, writable, executable); executed 99213 times by 153 tests: `return PageReservation(OSAllocator::reserveUncommitted(size, usage, writable, executable), size, writable, executable);` Executed by: tst_bindingdependencyapi tst_drawingmodes tst_ecmascripttests tst_examples tst_flickableinterop tst_multipointtoucharea_interop tst_parserstress tst_qjsengine tst_qjsonbinding tst_qjsvalue tst_qjsvalueiterator tst_qmlcachegen tst_qmldiskcache tst_qqmlapplicationengine tst_qqmlbinding tst_qqmlcomponent tst_qqmlconnections tst_qqmlconsole tst_qqmlcontext tst_qqmldebugclient tst_qqmldebugjs tst_qqmldebuglocal tst_qqmldebugservice tst_qqmlecmascript tst_qqmlenginecleanup ...	99213
108	}	-
109		-
110	void deallocate()	-
111	{	-
112	ASSERT(!m_committed);	-
113		-
114	// Clear base & size before calling release; if this is inside allocation	-
115	// then we won't be able to clear then after deallocating the memory.	-
116	PageReservation tmp;	-
117	std::swap(tmp, *this);	-
118		-
119	ASSERT(tmp);	-
120	ASSERT(!*this);	-
121		-
122	OSAllocator::releaseDecommitted(tmp.realBase(), tmp.realSize());	-
123	} executed 99255 times by 153 tests: `end of block` Executed by: tst_bindingdependencyapi tst_drawingmodes tst_ecmascripttests tst_examples tst_flickableinterop tst_multipointtoucharea_interop tst_parserstress tst_qjsengine tst_qjsonbinding tst_qjsvalue tst_qjsvalueiterator tst_qmlcachegen tst_qmldiskcache tst_qqmlapplicationengine tst_qqmlbinding tst_qqmlcomponent tst_qqmlconnections tst_qqmlconsole tst_qqmlcontext tst_qqmldebugclient tst_qqmldebugjs tst_qqmldebuglocal tst_qqmldebugservice tst_qqmlecmascript tst_qqmlenginecleanup ...	99255
124		-
125	private:	-
126	PageReservation(void* base, size_t size, bool writable, bool executable)	-
127	: PageBlock(base, size, false)	-
128	, m_committed(0)	-
129	, m_writable(writable)	-
130	, m_executable(executable)	-
131	{	-
132	} executed 99267 times by 153 tests: `end of block` Executed by: tst_bindingdependencyapi tst_drawingmodes tst_ecmascripttests tst_examples tst_flickableinterop tst_multipointtoucharea_interop tst_parserstress tst_qjsengine tst_qjsonbinding tst_qjsvalue tst_qjsvalueiterator tst_qmlcachegen tst_qmldiskcache tst_qqmlapplicationengine tst_qqmlbinding tst_qqmlcomponent tst_qqmlconnections tst_qqmlconsole tst_qqmlcontext tst_qqmldebugclient tst_qqmldebugjs tst_qqmldebuglocal tst_qqmldebugservice tst_qqmlecmascript tst_qqmlenginecleanup ...	99267
133		-
134	size_t m_committed;	-
135	bool m_writable;	-
136	bool m_executable;	-
137	};	-
138		-
139	}	-
140		-
141	using WTF::PageReservation;	-
142		-
143	#endif // PageReservation_h	-

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* 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.

#ifndef PageReservation_h

#define PageReservation_h

#include <wtf/PageAllocation.h>

namespace WTF {

PageReservation

Like PageAllocation, the PageReservation class provides a cross-platform memory

allocation interface, but with a set of capabilities more similar to that of

VirtualAlloc than posix mmap. PageReservation can be used to allocate virtual

memory without committing physical memory pages using PageReservation::reserve.

Following a call to reserve all memory in the region is in a decommited state,

in which the memory should not be used (accessing the memory may cause a fault).

Before using memory it must be committed by calling commit, which is passed start

and size values (both of which require system page size granularity). One the

committed memory is no longer needed 'decommit' may be called to return the

memory to its devommitted state. Commit should only be called on memory that is

currently decommitted, and decommit should only be called on memory regions that

are currently committed. All memory should be decommited before the reservation

is deallocated. Values in memory may not be retained accross a pair of calls if

the region of memory is decommitted and then committed again.

Memory protection should not be changed on decommitted memory, and if protection

is changed on memory while it is committed it should be returned to the orignal

protection before decommit is called.

class PageReservation : private PageBlock {

public:

PageReservation()

: m_committed(0)

, m_writable(false)

, m_executable(false)

{

}

executed 297753 times by 153 tests: end of block

Executed by:

tst_bindingdependencyapi
tst_drawingmodes
tst_ecmascripttests
tst_examples
tst_flickableinterop
tst_multipointtoucharea_interop
tst_parserstress
tst_qjsengine
tst_qjsonbinding
tst_qjsvalue
tst_qjsvalueiterator
tst_qmlcachegen
tst_qmldiskcache
tst_qqmlapplicationengine
tst_qqmlbinding
tst_qqmlcomponent
tst_qqmlconnections
tst_qqmlconsole
tst_qqmlcontext
tst_qqmldebugclient
tst_qqmldebugjs
tst_qqmldebuglocal
tst_qqmldebugservice
tst_qqmlecmascript
tst_qqmlenginecleanup
...

297753

using PageBlock::base;

using PageBlock::size;

#ifndef __clang__

using PageBlock::operator bool;

#else

// FIXME: This is a workaround for <rdar://problem/8876150>, wherein Clang incorrectly emits an access

// control warning when a client tries to use operator bool exposed above via "using PageBlock::operator bool".

operator bool() const { return PageBlock::operator bool(); }

#endif

void commit(void* start, size_t size)

{

ASSERT(*this);

ASSERT(isPageAligned(start));

ASSERT(isPageAligned(size));

ASSERT(contains(start, size));

m_committed += size;

OSAllocator::commit(start, size, m_writable, m_executable);

}

executed 499045 times by 153 tests: end of block

Executed by:

tst_bindingdependencyapi
tst_drawingmodes
tst_ecmascripttests
tst_examples
tst_flickableinterop
tst_multipointtoucharea_interop
tst_parserstress
tst_qjsengine
tst_qjsonbinding
tst_qjsvalue
tst_qjsvalueiterator
tst_qmlcachegen
tst_qmldiskcache
tst_qqmlapplicationengine
tst_qqmlbinding
tst_qqmlcomponent
tst_qqmlconnections
tst_qqmlconsole
tst_qqmlcontext
tst_qqmldebugclient
tst_qqmldebugjs
tst_qqmldebuglocal
tst_qqmldebugservice
tst_qqmlecmascript
tst_qqmlenginecleanup
...

499045

void decommit(void* start, size_t size)

{

ASSERT(*this);

ASSERT(isPageAligned(start));

ASSERT(isPageAligned(size));

ASSERT(contains(start, size));

m_committed -= size;

OSAllocator::decommit(start, size);

}

executed 498945 times by 153 tests: end of block

Executed by:

tst_bindingdependencyapi
tst_drawingmodes
tst_ecmascripttests
tst_examples
tst_flickableinterop
tst_multipointtoucharea_interop
tst_parserstress
tst_qjsengine
tst_qjsonbinding
tst_qjsvalue
tst_qjsvalueiterator
tst_qmlcachegen
tst_qmldiskcache
tst_qqmlapplicationengine
tst_qqmlbinding
tst_qqmlcomponent
tst_qqmlconnections
tst_qqmlconsole
tst_qqmlcontext
tst_qqmldebugclient
tst_qqmldebugjs
tst_qqmldebuglocal
tst_qqmldebugservice
tst_qqmlecmascript
tst_qqmlenginecleanup
...

498945

size_t committed()

100

{

101

return m_committed;

never executed: return m_committed;

102

}

103

104

static PageReservation reserve(size_t size, OSAllocator::Usage usage = OSAllocator::UnknownUsage, bool writable = true, bool executable = false)

105

{

106

ASSERT(isPageAligned(size));

107

return PageReservation(OSAllocator::reserveUncommitted(size, usage, writable, executable), size, writable, executable);

executed 99213 times by 153 tests: return PageReservation(OSAllocator::reserveUncommitted(size, usage, writable, executable), size, writable, executable);

Executed by: