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src/cpu/zero/vm/stack_zero.hpp@348346af6676 (annotated)

src/cpu/zero/vm/stack_zero.hpp

Thu, 06 May 2010 02:09:18 -0700

author

twisti

date

Thu, 06 May 2010 02:09:18 -0700

changeset 1866

348346af6676

parent 1860

0c5b3cf3c1f5

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6950178: Zero stack improvements
Summary: Moves the logic for determining the size of the Zero stack into the ZeroStack class.
Reviewed-by: twisti
Contributed-by: Gary Benson <gbenson@redhat.com>

never@1445	1	/*
never@1445	2	* Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
twisti@1814	3	* Copyright 2008, 2009, 2010 Red Hat, Inc.
never@1445	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@1445	5	*
never@1445	6	* This code is free software; you can redistribute it and/or modify it
never@1445	7	* under the terms of the GNU General Public License version 2 only, as
never@1445	8	* published by the Free Software Foundation.
never@1445	9	*
never@1445	10	* This code is distributed in the hope that it will be useful, but WITHOUT
never@1445	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@1445	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@1445	13	* version 2 for more details (a copy is included in the LICENSE file that
never@1445	14	* accompanied this code).
never@1445	15	*
never@1445	16	* You should have received a copy of the GNU General Public License version
never@1445	17	* 2 along with this work; if not, write to the Free Software Foundation,
never@1445	18	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@1445	19	*
never@1445	20	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
never@1445	21	* CA 95054 USA or visit www.sun.com if you need additional information or
never@1445	22	* have any questions.
never@1445	23	*
never@1445	24	*/
never@1445	25
never@1445	26	class ZeroStack {
never@1445	27	private:
never@1445	28	intptr_t *_base; // the last available word
never@1445	29	intptr_t *_top; // the word past the end of the stack
never@1445	30	intptr_t *_sp; // the top word on the stack
never@1445	31
twisti@1814	32	private:
twisti@1814	33	int _shadow_pages_size; // how much ABI stack must we keep free?
twisti@1814	34
never@1445	35	public:
never@1445	36	ZeroStack()
twisti@1814	37	: _base(NULL), _top(NULL), _sp(NULL) {
twisti@1814	38	_shadow_pages_size = StackShadowPages * os::vm_page_size();
twisti@1814	39	}
never@1445	40
never@1445	41	bool needs_setup() const {
never@1445	42	return _base == NULL;
never@1445	43	}
never@1445	44
twisti@1866	45	int suggest_size(Thread *thread) const;
twisti@1866	46
never@1445	47	void setup(void *mem, size_t size) {
never@1445	48	assert(needs_setup(), "already set up");
never@1445	49	assert(!(size & WordAlignmentMask), "unaligned");
never@1445	50
never@1445	51	_base = (intptr_t *) mem;
never@1445	52	_top = _base + (size >> LogBytesPerWord);
never@1445	53	_sp = _top;
never@1445	54	}
never@1445	55	void teardown() {
never@1445	56	assert(!needs_setup(), "not set up");
never@1445	57	assert(_sp == _top, "stuff on stack at teardown");
never@1445	58
never@1445	59	_base = NULL;
never@1445	60	_top = NULL;
never@1445	61	_sp = NULL;
never@1445	62	}
never@1445	63
never@1445	64	intptr_t *sp() const {
never@1445	65	return _sp;
never@1445	66	}
never@1445	67	void set_sp(intptr_t *new_sp) {
never@1445	68	assert(_top >= new_sp && new_sp >= _base, "bad stack pointer");
never@1445	69	_sp = new_sp;
never@1445	70	}
never@1445	71
twisti@1866	72	int total_words() const {
twisti@1866	73	return _top - _base;
twisti@1866	74	}
never@1445	75	int available_words() const {
never@1445	76	return _sp - _base;
never@1445	77	}
never@1445	78
never@1445	79	void push(intptr_t value) {
never@1445	80	assert(_sp > _base, "stack overflow");
never@1445	81	*(--_sp) = value;
never@1445	82	}
never@1445	83	intptr_t pop() {
never@1445	84	assert(_sp < _top, "stack underflow");
never@1445	85	return *(_sp++);
never@1445	86	}
never@1445	87
never@1445	88	void *alloc(size_t size) {
never@1445	89	int count = align_size_up(size, wordSize) >> LogBytesPerWord;
never@1445	90	assert(count <= available_words(), "stack overflow");
never@1445	91	return _sp -= count;
never@1445	92	}
never@1445	93
twisti@1814	94	int shadow_pages_size() const {
twisti@1814	95	return _shadow_pages_size;
twisti@1814	96	}
twisti@1866	97	int abi_stack_available(Thread *thread) const;
twisti@1814	98
twisti@1814	99	public:
twisti@1814	100	void overflow_check(int required_words, TRAPS);
twisti@1814	101	static void handle_overflow(TRAPS);
twisti@1814	102
never@1445	103	public:
twisti@1860	104	void zap(int c) PRODUCT_RETURN;
twisti@1860	105
twisti@1860	106	public:
never@1445	107	static ByteSize base_offset() {
never@1445	108	return byte_offset_of(ZeroStack, _base);
never@1445	109	}
never@1445	110	static ByteSize top_offset() {
never@1445	111	return byte_offset_of(ZeroStack, _top);
never@1445	112	}
never@1445	113	static ByteSize sp_offset() {
never@1445	114	return byte_offset_of(ZeroStack, _sp);
never@1445	115	}
never@1445	116	};
never@1445	117
never@1445	118
never@1445	119	class EntryFrame;
never@1445	120	class InterpreterFrame;
never@1445	121	class SharkFrame;
never@1445	122	class FakeStubFrame;
never@1445	123
never@1445	124	//
never@1445	125	// | ... |
never@1445	126	// +--------------------+ ------------------
never@1445	127	// | ... | low addresses
never@1445	128	// | frame_type |
never@1445	129	// | next_frame | high addresses
never@1445	130	// +--------------------+ ------------------
never@1445	131	// | ... |
never@1445	132
never@1445	133	class ZeroFrame {
never@1445	134	friend class frame;
never@1445	135	friend class ZeroStackPrinter;
never@1445	136
never@1445	137	protected:
never@1445	138	ZeroFrame() {
never@1445	139	ShouldNotCallThis();
never@1445	140	}
never@1445	141
never@1445	142	enum Layout {
never@1445	143	next_frame_off,
never@1445	144	frame_type_off,
never@1445	145	jf_header_words
never@1445	146	};
never@1445	147
never@1445	148	enum FrameType {
never@1445	149	ENTRY_FRAME = 1,
never@1445	150	INTERPRETER_FRAME,
never@1445	151	SHARK_FRAME,
never@1445	152	FAKE_STUB_FRAME
never@1445	153	};
never@1445	154
never@1445	155	protected:
never@1445	156	intptr_t *addr_of_word(int offset) const {
never@1445	157	return (intptr_t *) this - offset;
never@1445	158	}
never@1445	159	intptr_t value_of_word(int offset) const {
never@1445	160	return *addr_of_word(offset);
never@1445	161	}
never@1445	162
never@1445	163	public:
never@1445	164	ZeroFrame *next() const {
never@1445	165	return (ZeroFrame *) value_of_word(next_frame_off);
never@1445	166	}
never@1445	167
never@1445	168	protected:
never@1445	169	FrameType type() const {
never@1445	170	return (FrameType) value_of_word(frame_type_off);
never@1445	171	}
never@1445	172
never@1445	173	public:
never@1445	174	bool is_entry_frame() const {
never@1445	175	return type() == ENTRY_FRAME;
never@1445	176	}
never@1445	177	bool is_interpreter_frame() const {
never@1445	178	return type() == INTERPRETER_FRAME;
never@1445	179	}
never@1445	180	bool is_shark_frame() const {
never@1445	181	return type() == SHARK_FRAME;
never@1445	182	}
never@1445	183	bool is_fake_stub_frame() const {
never@1445	184	return type() == FAKE_STUB_FRAME;
never@1445	185	}
never@1445	186
never@1445	187	public:
never@1445	188	EntryFrame *as_entry_frame() const {
never@1445	189	assert(is_entry_frame(), "should be");
never@1445	190	return (EntryFrame *) this;
never@1445	191	}
never@1445	192	InterpreterFrame *as_interpreter_frame() const {
never@1445	193	assert(is_interpreter_frame(), "should be");
never@1445	194	return (InterpreterFrame *) this;
never@1445	195	}
never@1445	196	SharkFrame *as_shark_frame() const {
never@1445	197	assert(is_shark_frame(), "should be");
never@1445	198	return (SharkFrame *) this;
never@1445	199	}
never@1445	200	FakeStubFrame *as_fake_stub_frame() const {
never@1445	201	assert(is_fake_stub_frame(), "should be");
never@1445	202	return (FakeStubFrame *) this;
never@1445	203	}
never@1445	204
never@1445	205	public:
never@1445	206	void identify_word(int frame_index,
never@1445	207	int offset,
never@1445	208	char* fieldbuf,
never@1445	209	char* valuebuf,
never@1445	210	int buflen) const;
never@1445	211
never@1445	212	protected:
never@1445	213	void identify_vp_word(int frame_index,
never@1445	214	intptr_t* addr,
never@1445	215	intptr_t* monitor_base,
never@1445	216	intptr_t* stack_base,
never@1445	217	char* fieldbuf,
never@1445	218	int buflen) const;
never@1445	219	};