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src/os_cpu/linux_zero/vm/thread_linux_zero.hpp@f9271ff9d324 (annotated)

src/os_cpu/linux_zero/vm/thread_linux_zero.hpp

Thu, 15 Apr 2010 02:40:12 -0700

author

twisti

date

Thu, 15 Apr 2010 02:40:12 -0700

changeset 1814

f9271ff9d324

parent 1445

354d3184f6b2

child 1860

0c5b3cf3c1f5

permissions

-rw-r--r--

6941224: Improved stack overflow handling for Zero
Summary: Adding stack overflow checking to Shark brought to light a bunch of deficiencies in Zero's stack overflow code.
Reviewed-by: twisti
Contributed-by: Gary Benson <gbenson@redhat.com>

never@1445	1	/*
never@1445	2	* Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved.
twisti@1814	3	* Copyright 2007, 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	private:
never@1445	27	ZeroStack _zero_stack;
never@1445	28	ZeroFrame* _top_zero_frame;
never@1445	29
never@1445	30	void pd_initialize() {
never@1445	31	_top_zero_frame = NULL;
never@1445	32	}
never@1445	33
never@1445	34	public:
never@1445	35	ZeroStack *zero_stack() {
never@1445	36	return &_zero_stack;
never@1445	37	}
never@1445	38
never@1445	39	public:
never@1445	40	ZeroFrame *top_zero_frame() {
never@1445	41	return _top_zero_frame;
never@1445	42	}
never@1445	43	void push_zero_frame(ZeroFrame *frame) {
never@1445	44	*(ZeroFrame **) frame = _top_zero_frame;
never@1445	45	_top_zero_frame = frame;
never@1445	46	}
never@1445	47	void pop_zero_frame() {
never@1445	48	zero_stack()->set_sp((intptr_t *) _top_zero_frame + 1);
never@1445	49	_top_zero_frame = *(ZeroFrame **) _top_zero_frame;
never@1445	50	}
never@1445	51
never@1445	52	public:
never@1445	53	static ByteSize zero_stack_offset() {
never@1445	54	return byte_offset_of(JavaThread, _zero_stack);
never@1445	55	}
never@1445	56	static ByteSize top_zero_frame_offset() {
never@1445	57	return byte_offset_of(JavaThread, _top_zero_frame);
never@1445	58	}
never@1445	59
never@1445	60	public:
never@1445	61	void record_base_of_stack_pointer() {
never@1445	62	assert(top_zero_frame() == NULL, "junk on stack prior to Java call");
never@1445	63	}
never@1445	64	void set_base_of_stack_pointer(intptr_t* base_sp) {
never@1445	65	assert(base_sp == NULL, "should be");
never@1445	66	assert(top_zero_frame() == NULL, "junk on stack after Java call");
never@1445	67	}
never@1445	68
never@1445	69	public:
never@1445	70	void set_last_Java_frame() {
twisti@1814	71	set_last_Java_frame(top_zero_frame());
never@1445	72	}
never@1445	73	void reset_last_Java_frame() {
twisti@1814	74	set_last_Java_frame(NULL);
twisti@1814	75	}
twisti@1814	76	void set_last_Java_frame(ZeroFrame* frame) {
twisti@1814	77	frame_anchor()->set_last_Java_sp((intptr_t *) frame);
never@1445	78	}
never@1445	79
never@1445	80	private:
never@1445	81	frame pd_last_frame() {
never@1445	82	assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
never@1445	83	return frame(last_Java_sp(), zero_stack()->sp());
never@1445	84	}
never@1445	85
never@1445	86	public:
never@1445	87	// Check for pending suspend requests and pending asynchronous
never@1445	88	// exceptions. There are separate accessors for these, but
never@1445	89	// _suspend_flags is volatile so using them would be unsafe.
never@1445	90	bool has_special_condition_for_native_trans() {
never@1445	91	return _suspend_flags != 0;
never@1445	92	}
never@1445	93
never@1445	94	public:
never@1445	95	bool pd_get_top_frame_for_signal_handler(frame* fr_addr,
never@1445	96	void* ucontext,
never@1445	97	bool isInJava) {
never@1445	98	ShouldNotCallThis();
never@1445	99	}
never@1445	100
never@1445	101	// These routines are only used on cpu architectures that
never@1445	102	// have separate register stacks (Itanium).
never@1445	103	static bool register_stack_overflow() { return false; }
never@1445	104	static void enable_register_stack_guard() {}
never@1445	105	static void disable_register_stack_guard() {}