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

src/share/vm/runtime/relocator.hpp@a4c7fe54bf3f (annotated)

src/share/vm/runtime/relocator.hpp

Thu, 21 Oct 2010 10:10:23 -0400

author

kamg

date

Thu, 21 Oct 2010 10:10:23 -0400

changeset 2232

a4c7fe54bf3f

parent 1907

c18cbe5936b8

child 2314

f95d63e2154a

permissions

-rw-r--r--

6991315: RedefineClasses fails with java.lang.VerifyError
Summary: Repair stackmap table attribute when relocating bytecode
Reviewed-by: acorn, never

duke@435	1	/*
trims@1907	2	* Copyright (c) 1997, 2004, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// This code has been converted from the 1.1E java virtual machine
duke@435	26	// Thanks to the JavaTopics group for using the code
duke@435	27
duke@435	28	class ChangeItem;
duke@435	29
duke@435	30	// Callback object for code relocations
duke@435	31	class RelocatorListener : public StackObj {
duke@435	32	public:
duke@435	33	RelocatorListener() {};
duke@435	34	virtual void relocated(int bci, int delta, int new_method_size) = 0;
duke@435	35	};
duke@435	36
duke@435	37
duke@435	38	class Relocator : public ResourceObj {
duke@435	39	public:
duke@435	40	Relocator(methodHandle method, RelocatorListener* listener);
duke@435	41	methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS);
duke@435	42
duke@435	43	// Callbacks from ChangeItem's
duke@435	44	bool handle_code_changes();
duke@435	45	bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions
duke@435	46	void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps
duke@435	47	bool handle_jump_widen (int bci, int delta); // handles jumps
duke@435	48	bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches
duke@435	49
duke@435	50	private:
duke@435	51	unsigned char* _code_array;
duke@435	52	int _code_array_length;
duke@435	53	int _code_length;
duke@435	54	unsigned char* _compressed_line_number_table;
duke@435	55	int _compressed_line_number_table_size;
duke@435	56	methodHandle _method;
duke@435	57	u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions
duke@435	58
duke@435	59	GrowableArray<ChangeItem*>* _changes;
duke@435	60
duke@435	61	unsigned char* code_array() const { return _code_array; }
duke@435	62	void set_code_array(unsigned char* array) { _code_array = array; }
duke@435	63
duke@435	64	int code_length() const { return _code_length; }
duke@435	65	void set_code_length(int length) { _code_length = length; }
duke@435	66
duke@435	67	int code_array_length() const { return _code_array_length; }
duke@435	68	void set_code_array_length(int length) { _code_array_length = length; }
duke@435	69
duke@435	70	unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; }
duke@435	71	void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; }
duke@435	72
duke@435	73	int compressed_line_number_table_size() const { return _compressed_line_number_table_size; }
duke@435	74	void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; }
duke@435	75
duke@435	76	methodHandle method() const { return _method; }
duke@435	77	void set_method(methodHandle method) { _method = method; }
duke@435	78
duke@435	79	// This will return a raw bytecode, which is possibly rewritten.
duke@435	80	Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; }
duke@435	81	void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; }
duke@435	82
duke@435	83	// get and set signed integers in the code_array
duke@435	84	inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); }
duke@435	85	inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); }
duke@435	86
duke@435	87	// get and set signed shorts in the code_array
duke@435	88	inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); }
duke@435	89	inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); }
duke@435	90
duke@435	91	// get the address of in the code_array
duke@435	92	inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; }
duke@435	93
duke@435	94	int instruction_length_at(int bci) { return Bytecodes::length_at(code_array() + bci); }
duke@435	95
duke@435	96	// Helper methods
duke@435	97	int align(int n) const { return (n+3) & ~3; }
duke@435	98	int code_slop_pct() const { return 25; }
duke@435	99	bool is_opcode_lookupswitch(Bytecodes::Code bc);
duke@435	100
duke@435	101	// basic relocation methods
duke@435	102	bool relocate_code (int bci, int ilen, int delta);
duke@435	103	void change_jumps (int break_bci, int delta);
duke@435	104	void change_jump (int bci, int offset, bool is_short, int break_bci, int delta);
duke@435	105	void adjust_exception_table(int bci, int delta);
duke@435	106	void adjust_line_no_table (int bci, int delta);
duke@435	107	void adjust_local_var_table(int bci, int delta);
kamg@2232	108	void adjust_stack_map_table(int bci, int delta);
duke@435	109	int get_orig_switch_pad (int bci, bool is_lookup_switch);
duke@435	110	int rc_instr_len (int bci);
duke@435	111	bool expand_code_array (int delta);
duke@435	112
duke@435	113	// Callback support
duke@435	114	RelocatorListener *_listener;
duke@435	115	void notify(int bci, int delta, int new_code_length) {
duke@435	116	if (_listener != NULL)
duke@435	117	_listener->relocated(bci, delta, new_code_length);
duke@435	118	}
duke@435	119	};