PageAllocation.h

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PageAllocation.h

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/home/opencoverage/opencoverage/guest-scripts/qtdeclarative/src/qtdeclarative/src/3rdparty/masm/wtf/PageAllocation.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 PageAllocation_h	-
27	#define PageAllocation_h	-
28		-
29	#include <wtf/Assertions.h>	-
30	#include <wtf/OSAllocator.h>	-
31	#include <wtf/PageBlock.h>	-
32	#include <wtf/UnusedParam.h>	-
33	#include <wtf/VMTags.h>	-
34	#include <algorithm>	-
35		-
36	#if OS(DARWIN)	-
37	#include <mach/mach_init.h>	-
38	#include <mach/vm_map.h>	-
39	#endif	-
40		-
41	#if OS(WINDOWS)	-
42	#include <malloc.h>	-
43	#include <windows.h>	-
44	#endif	-
45		-
46	#if HAVE(ERRNO_H)	-
47	#include <errno.h>	-
48	#endif	-
49		-
50	#if HAVE(MMAP)	-
51	#include <sys/mman.h>	-
52	#include <unistd.h>	-
53	#endif	-
54		-
55	namespace WTF {	-
56		-
57	/*	-
58	PageAllocation	-
59		-
60	The PageAllocation class provides a cross-platform memory allocation interface	-
61	with similar capabilities to posix mmap/munmap. Memory is allocated by calling	-
62	PageAllocation::allocate, and deallocated by calling deallocate on the	-
63	PageAllocation object. The PageAllocation holds the allocation's base pointer	-
64	and size.	-
65		-
66	The allocate method is passed the size required (which must be a multiple of	-
67	the system page size, which can be accessed using PageAllocation::pageSize).	-
68	Callers may also optinally provide a flag indicating the usage (for use by	-
69	system memory usage tracking tools, where implemented), and boolean values	-
70	specifying the required protection (defaulting to writable, non-executable).	-
71	*/	-
72		-
73	class PageAllocation : private PageBlock {	-
74	public:	-
75	PageAllocation()	-
76	{	-
77	}	-
78		-
79	using PageBlock::size;	-
80	using PageBlock::base;	-
81		-
82	#ifndef __clang__	-
83	using PageBlock::operator bool;	-
84	#else	-
85	// FIXME: This is a workaround for <rdar://problem/8876150>, wherein Clang incorrectly emits an access	-
86	// control warning when a client tries to use operator bool exposed above via "using PageBlock::operator bool".	-
87	operator bool() const { return PageBlock::operator bool(); }	-
88	#endif	-
89	bool operator<(const PageAllocation &b) { return base() < b.base(); } never executed: `return base() < b.base();`	0
90		-
91	static PageAllocation allocate(size_t size,	-
92	OSAllocator::Usage usage = OSAllocator::UnknownUsage,	-
93	bool writable = true, bool executable = false,	-
94	bool includesGuardPages = false)	-
95	{	-
96	ASSERT(isPageAligned(size));	-
97	return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable, executed 505426 times by 153 tests: `return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable, includesGuardPages), size, includesGuardPages);` 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 ...	505426
98	includesGuardPages), size, executed 505426 times by 153 tests: `return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable, includesGuardPages), size, includesGuardPages);` 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 ...	505426
99	includesGuardPages); executed 505426 times by 153 tests: `return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable, includesGuardPages), size, includesGuardPages);` 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 ...	505426
100	}	-
101		-
102	void deallocate()	-
103	{	-
104	// Clear base & size before calling release; if this is inside allocation	-
105	// then we won't be able to clear then after deallocating the memory.	-
106	PageAllocation tmp;	-
107	std::swap(tmp, *this);	-
108		-
109	ASSERT(tmp);	-
110	ASSERT(!*this);	-
111		-
112	OSAllocator::decommitAndRelease(tmp.realBase(), tmp.realSize());	-
113	} executed 505824 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 ...	505824
114		-
115	private:	-
116	PageAllocation(void* base, size_t size, bool includesGuardPages = false)	-
117	: PageBlock(base, size, includesGuardPages)	-
118	{	-
119	} executed 506359 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 ...	506359
120	};	-
121		-
122	} // namespace WTF	-
123		-
124	using WTF::PageAllocation;	-
125		-
126	#endif // PageAllocation_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 PageAllocation_h

#define PageAllocation_h

#include <wtf/Assertions.h>

#include <wtf/OSAllocator.h>

#include <wtf/PageBlock.h>

#include <wtf/UnusedParam.h>

#include <wtf/VMTags.h>

#include <algorithm>

#if OS(DARWIN)

#include <mach/mach_init.h>

#include <mach/vm_map.h>

#endif

#if OS(WINDOWS)

#include <malloc.h>

#include <windows.h>

#endif

#if HAVE(ERRNO_H)

#include <errno.h>

#endif

#if HAVE(MMAP)

#include <sys/mman.h>

#include <unistd.h>

#endif

namespace WTF {

PageAllocation

The PageAllocation class provides a cross-platform memory allocation interface

with similar capabilities to posix mmap/munmap. Memory is allocated by calling

PageAllocation::allocate, and deallocated by calling deallocate on the

PageAllocation object. The PageAllocation holds the allocation's base pointer

and size.

The allocate method is passed the size required (which must be a multiple of

the system page size, which can be accessed using PageAllocation::pageSize).

Callers may also optinally provide a flag indicating the usage (for use by

system memory usage tracking tools, where implemented), and boolean values

specifying the required protection (defaulting to writable, non-executable).

class PageAllocation : private PageBlock {

public:

PageAllocation()

{

}

using PageBlock::size;

using PageBlock::base;

#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

bool operator<(const PageAllocation &b) { return base() < b.base(); }

never executed: return base() < b.base();

static PageAllocation allocate(size_t size,

OSAllocator::Usage usage = OSAllocator::UnknownUsage,

bool writable = true, bool executable = false,

bool includesGuardPages = false)

{

ASSERT(isPageAligned(size));

return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable,

executed 505426 times by 153 tests:

return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable, includesGuardPages), size, includesGuardPages);

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
...

505426

includesGuardPages), size,

executed 505426 times by 153 tests:

return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable, includesGuardPages), size, includesGuardPages);

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
...

505426

includesGuardPages);

executed 505426 times by 153 tests:

return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable, includesGuardPages), size, includesGuardPages);

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
...

505426

}

void deallocate()

{

// Clear base & size before calling release; if this is *inside* allocation

105

// then we won't be able to clear then after deallocating the memory.

106

PageAllocation tmp;

107

std::swap(tmp, *this);

ASSERT(tmp);

ASSERT(!*this);

OSAllocator::decommitAndRelease(tmp.realBase(), tmp.realSize());

113

}

executed 505824 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
...

505824

114

115

private:

116

PageAllocation(void* base, size_t size, bool includesGuardPages = false)

117

: PageBlock(base, size, includesGuardPages)

118

{

119

}

executed 506359 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
...

506359

};

} // namespace WTF

using WTF::PageAllocation;

125

126

#endif // PageAllocation_h

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