• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/classfile/stackMapFrame.hpp@a61af66fc99e (annotated)

src/share/vm/classfile/stackMapFrame.hpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Initial load

duke@435	1	/*
duke@435	2	* Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// A StackMapFrame represents one frame in the stack map attribute.
duke@435	26
duke@435	27	enum {
duke@435	28	FLAG_THIS_UNINIT = 0x01
duke@435	29	};
duke@435	30
duke@435	31	class StackMapFrame : public ResourceObj {
duke@435	32	private:
duke@435	33	int32_t _offset;
duke@435	34
duke@435	35	// See comment in StackMapTable about _frame_count about why these
duke@435	36	// fields are int32_t instead of u2.
duke@435	37	int32_t _locals_size; // number of valid type elements in _locals
duke@435	38	int32_t _stack_size; // number of valid type elements in _stack
duke@435	39
duke@435	40	int32_t _max_locals;
duke@435	41	int32_t _max_stack;
duke@435	42
duke@435	43	u1 _flags;
duke@435	44	VerificationType* _locals; // local variable type array
duke@435	45	VerificationType* _stack; // operand stack type array
duke@435	46
duke@435	47	ClassVerifier* _verifier; // the verifier verifying this method
duke@435	48
duke@435	49	public:
duke@435	50	// constructors
duke@435	51
duke@435	52	// This constructor is used by the type checker to allocate frames
duke@435	53	// in type state, which have _max_locals and _max_stack array elements
duke@435	54	// in _locals and _stack.
duke@435	55	StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* verifier);
duke@435	56
duke@435	57	// This constructor is used to initialize stackmap frames in stackmap table,
duke@435	58	// which have _locals_size and _stack_size array elements in _locals and _stack.
duke@435	59	StackMapFrame(int32_t offset,
duke@435	60	u1 flags,
duke@435	61	u2 locals_size,
duke@435	62	u2 stack_size,
duke@435	63	u2 max_locals,
duke@435	64	u2 max_stack,
duke@435	65	VerificationType* locals,
duke@435	66	VerificationType* stack,
duke@435	67	ClassVerifier* v) : _offset(offset), _flags(flags),
duke@435	68	_locals_size(locals_size),
duke@435	69	_stack_size(stack_size),
duke@435	70	_max_locals(max_locals),
duke@435	71	_max_stack(max_stack),
duke@435	72	_locals(locals), _stack(stack),
duke@435	73	_verifier(v) { }
duke@435	74
duke@435	75	inline void set_offset(int32_t offset) { _offset = offset; }
duke@435	76	inline void set_verifier(ClassVerifier* v) { _verifier = v; }
duke@435	77	inline void set_flags(u1 flags) { _flags = flags; }
duke@435	78	inline void set_locals_size(u2 locals_size) { _locals_size = locals_size; }
duke@435	79	inline void set_stack_size(u2 stack_size) { _stack_size = stack_size; }
duke@435	80	inline void clear_stack() { _stack_size = 0; }
duke@435	81	inline int32_t offset() const { return _offset; }
duke@435	82	inline ClassVerifier* verifier() const { return _verifier; }
duke@435	83	inline u1 flags() const { return _flags; }
duke@435	84	inline int32_t locals_size() const { return _locals_size; }
duke@435	85	inline VerificationType* locals() const { return _locals; }
duke@435	86	inline int32_t stack_size() const { return _stack_size; }
duke@435	87	inline VerificationType* stack() const { return _stack; }
duke@435	88	inline int32_t max_locals() const { return _max_locals; }
duke@435	89	inline int32_t max_stack() const { return _max_stack; }
duke@435	90	inline bool flag_this_uninit() const { return _flags & FLAG_THIS_UNINIT; }
duke@435	91
duke@435	92	// Set locals and stack types to bogus
duke@435	93	inline void reset() {
duke@435	94	int32_t i;
duke@435	95	for (i = 0; i < _max_locals; i++) {
duke@435	96	_locals[i] = VerificationType::bogus_type();
duke@435	97	}
duke@435	98	for (i = 0; i < _max_stack; i++) {
duke@435	99	_stack[i] = VerificationType::bogus_type();
duke@435	100	}
duke@435	101	}
duke@435	102
duke@435	103	// Return a StackMapFrame with the same local variable array and empty stack.
duke@435	104	// Stack array is allocate with unused one element.
duke@435	105	StackMapFrame* frame_in_exception_handler(u1 flags);
duke@435	106
duke@435	107	// Set local variable type array based on m's signature.
duke@435	108	VerificationType set_locals_from_arg(
duke@435	109	const methodHandle m, VerificationType thisKlass, TRAPS);
duke@435	110
duke@435	111	// Search local variable type array and stack type array.
duke@435	112	// Return true if an uninitialized object is found.
duke@435	113	bool has_new_object() const;
duke@435	114
duke@435	115	// Search local variable type array and stack type array.
duke@435	116	// Set every element with type of old_object to new_object.
duke@435	117	void initialize_object(
duke@435	118	VerificationType old_object, VerificationType new_object);
duke@435	119
duke@435	120	// Copy local variable type array in src into this local variable type array.
duke@435	121	void copy_locals(const StackMapFrame* src);
duke@435	122
duke@435	123	// Copy stack type array in src into this stack type array.
duke@435	124	void copy_stack(const StackMapFrame* src);
duke@435	125
duke@435	126	// Return true if this stack map frame is assignable to target.
duke@435	127	bool is_assignable_to(const StackMapFrame* target, TRAPS) const;
duke@435	128
duke@435	129	// Push type into stack type array.
duke@435	130	inline void push_stack(VerificationType type, TRAPS) {
duke@435	131	assert(!type.is_check(), "Must be a real type");
duke@435	132	if (_stack_size >= _max_stack) {
duke@435	133	verifier()->verify_error(_offset, "Operand stack overflow");
duke@435	134	return;
duke@435	135	}
duke@435	136	_stack[_stack_size++] = type;
duke@435	137	}
duke@435	138
duke@435	139	inline void push_stack_2(
duke@435	140	VerificationType type1, VerificationType type2, TRAPS) {
duke@435	141	assert(type1.is_long() || type1.is_double(), "must be long/double");
duke@435	142	assert(type2.is_long2() || type2.is_double2(), "must be long/double_2");
duke@435	143	if (_stack_size >= _max_stack - 1) {
duke@435	144	verifier()->verify_error(_offset, "Operand stack overflow");
duke@435	145	return;
duke@435	146	}
duke@435	147	_stack[_stack_size++] = type1;
duke@435	148	_stack[_stack_size++] = type2;
duke@435	149	}
duke@435	150
duke@435	151	// Pop and return the top type on stack without verifying.
duke@435	152	inline VerificationType pop_stack(TRAPS) {
duke@435	153	if (_stack_size <= 0) {
duke@435	154	verifier()->verify_error(_offset, "Operand stack underflow");
duke@435	155	return VerificationType::bogus_type();
duke@435	156	}
duke@435	157	// Put bogus type to indicate it's no longer valid.
duke@435	158	// Added to make it consistent with the other pop_stack method.
duke@435	159	VerificationType top = _stack[--_stack_size];
duke@435	160	NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); )
duke@435	161	return top;
duke@435	162	}
duke@435	163
duke@435	164	// Pop and return the top type on stack type array after verifying it
duke@435	165	// is assignable to type.
duke@435	166	inline VerificationType pop_stack(VerificationType type, TRAPS) {
duke@435	167	if (_stack_size != 0) {
duke@435	168	VerificationType top = _stack[_stack_size - 1];
duke@435	169	bool subtype = type.is_assignable_from(
duke@435	170	top, verifier()->current_class(),
duke@435	171	CHECK_(VerificationType::bogus_type()));
duke@435	172	if (subtype) {
duke@435	173	_stack_size --;
duke@435	174	NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); )
duke@435	175	return top;
duke@435	176	}
duke@435	177	}
duke@435	178	return pop_stack_ex(type, THREAD);
duke@435	179	}
duke@435	180
duke@435	181	inline void pop_stack_2(
duke@435	182	VerificationType type1, VerificationType type2, TRAPS) {
duke@435	183	assert(type1.is_long2() || type1.is_double2(), "must be long/double");
duke@435	184	assert(type2.is_long() || type2.is_double(), "must be long/double_2");
duke@435	185	if (_stack_size >= 2) {
duke@435	186	VerificationType top1 = _stack[_stack_size - 1];
duke@435	187	bool subtype1 = type1.is_assignable_from(
duke@435	188	top1, verifier()->current_class(), CHECK);
duke@435	189	VerificationType top2 = _stack[_stack_size - 2];
duke@435	190	bool subtype2 = type2.is_assignable_from(
duke@435	191	top2, verifier()->current_class(), CHECK);
duke@435	192	if (subtype1 && subtype2) {
duke@435	193	_stack_size -= 2;
duke@435	194	NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); )
duke@435	195	NOT_PRODUCT( _stack[_stack_size+1] = VerificationType::bogus_type(); )
duke@435	196	return;
duke@435	197	}
duke@435	198	}
duke@435	199	pop_stack_ex(type1, THREAD);
duke@435	200	pop_stack_ex(type2, THREAD);
duke@435	201	}
duke@435	202
duke@435	203	// Uncommon case that throws exceptions.
duke@435	204	VerificationType pop_stack_ex(VerificationType type, TRAPS);
duke@435	205
duke@435	206	// Return the type at index in local variable array after verifying
duke@435	207	// it is assignable to type.
duke@435	208	VerificationType get_local(int32_t index, VerificationType type, TRAPS);
duke@435	209	// For long/double.
duke@435	210	void get_local_2(
duke@435	211	int32_t index, VerificationType type1, VerificationType type2, TRAPS);
duke@435	212
duke@435	213	// Set element at index in local variable array to type.
duke@435	214	void set_local(int32_t index, VerificationType type, TRAPS);
duke@435	215	// For long/double.
duke@435	216	void set_local_2(
duke@435	217	int32_t index, VerificationType type1, VerificationType type2, TRAPS);
duke@435	218
duke@435	219	// Private auxiliary method used only in is_assignable_to(StackMapFrame).
duke@435	220	// Returns true if src is assignable to target.
duke@435	221	bool is_assignable_to(
duke@435	222	VerificationType* src, VerificationType* target, int32_t len, TRAPS) const;
duke@435	223
duke@435	224	// Debugging
duke@435	225	void print() const PRODUCT_RETURN;
duke@435	226	};