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src/share/vm/runtime/relocator.hpp@427b2fb1944f (annotated)

src/share/vm/runtime/relocator.hpp

Wed, 31 Jan 2018 19:24:57 -0500

author

dbuck

date

Wed, 31 Jan 2018 19:24:57 -0500

changeset 9289

427b2fb1944f

parent 4037

da91efe96a93

child 6876

710a3c8b516e

permissions

-rw-r--r--

8189170: Add option to disable stack overflow checking in primordial thread for use with JNI_CreateJavaJVM
Reviewed-by: dcubed

duke@435	1	/*
coleenp@4037	2	* Copyright (c) 1997, 2012, 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
stefank@2314	25	#ifndef SHARE_VM_RUNTIME_RELOCATOR_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_RELOCATOR_HPP
stefank@2314	27
stefank@2314	28	#include "interpreter/bytecodes.hpp"
coleenp@4037	29	#include "oops/method.hpp"
stefank@2314	30	#ifdef TARGET_ARCH_x86
stefank@2314	31	# include "bytes_x86.hpp"
stefank@2314	32	#endif
stefank@2314	33	#ifdef TARGET_ARCH_sparc
stefank@2314	34	# include "bytes_sparc.hpp"
stefank@2314	35	#endif
stefank@2314	36	#ifdef TARGET_ARCH_zero
stefank@2314	37	# include "bytes_zero.hpp"
stefank@2314	38	#endif
bobv@2508	39	#ifdef TARGET_ARCH_arm
bobv@2508	40	# include "bytes_arm.hpp"
bobv@2508	41	#endif
bobv@2508	42	#ifdef TARGET_ARCH_ppc
bobv@2508	43	# include "bytes_ppc.hpp"
bobv@2508	44	#endif
stefank@2314	45
duke@435	46	// This code has been converted from the 1.1E java virtual machine
duke@435	47	// Thanks to the JavaTopics group for using the code
duke@435	48
duke@435	49	class ChangeItem;
duke@435	50
duke@435	51	// Callback object for code relocations
duke@435	52	class RelocatorListener : public StackObj {
duke@435	53	public:
duke@435	54	RelocatorListener() {};
duke@435	55	virtual void relocated(int bci, int delta, int new_method_size) = 0;
duke@435	56	};
duke@435	57
duke@435	58
duke@435	59	class Relocator : public ResourceObj {
duke@435	60	public:
duke@435	61	Relocator(methodHandle method, RelocatorListener* listener);
duke@435	62	methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS);
duke@435	63
duke@435	64	// Callbacks from ChangeItem's
duke@435	65	bool handle_code_changes();
duke@435	66	bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions
duke@435	67	void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps
duke@435	68	bool handle_jump_widen (int bci, int delta); // handles jumps
duke@435	69	bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches
duke@435	70
duke@435	71	private:
duke@435	72	unsigned char* _code_array;
duke@435	73	int _code_array_length;
duke@435	74	int _code_length;
duke@435	75	unsigned char* _compressed_line_number_table;
duke@435	76	int _compressed_line_number_table_size;
duke@435	77	methodHandle _method;
duke@435	78	u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions
duke@435	79
duke@435	80	GrowableArray<ChangeItem*>* _changes;
duke@435	81
duke@435	82	unsigned char* code_array() const { return _code_array; }
duke@435	83	void set_code_array(unsigned char* array) { _code_array = array; }
duke@435	84
duke@435	85	int code_length() const { return _code_length; }
duke@435	86	void set_code_length(int length) { _code_length = length; }
duke@435	87
duke@435	88	int code_array_length() const { return _code_array_length; }
duke@435	89	void set_code_array_length(int length) { _code_array_length = length; }
duke@435	90
duke@435	91	unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; }
duke@435	92	void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; }
duke@435	93
duke@435	94	int compressed_line_number_table_size() const { return _compressed_line_number_table_size; }
duke@435	95	void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; }
duke@435	96
duke@435	97	methodHandle method() const { return _method; }
duke@435	98	void set_method(methodHandle method) { _method = method; }
duke@435	99
duke@435	100	// This will return a raw bytecode, which is possibly rewritten.
duke@435	101	Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; }
duke@435	102	void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; }
duke@435	103
duke@435	104	// get and set signed integers in the code_array
duke@435	105	inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); }
duke@435	106	inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); }
duke@435	107
duke@435	108	// get and set signed shorts in the code_array
duke@435	109	inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); }
duke@435	110	inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); }
duke@435	111
duke@435	112	// get the address of in the code_array
duke@435	113	inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; }
duke@435	114
never@2466	115	int instruction_length_at(int bci) { return Bytecodes::length_at(NULL, code_array() + bci); }
duke@435	116
duke@435	117	// Helper methods
duke@435	118	int align(int n) const { return (n+3) & ~3; }
duke@435	119	int code_slop_pct() const { return 25; }
duke@435	120	bool is_opcode_lookupswitch(Bytecodes::Code bc);
duke@435	121
duke@435	122	// basic relocation methods
duke@435	123	bool relocate_code (int bci, int ilen, int delta);
duke@435	124	void change_jumps (int break_bci, int delta);
duke@435	125	void change_jump (int bci, int offset, bool is_short, int break_bci, int delta);
duke@435	126	void adjust_exception_table(int bci, int delta);
duke@435	127	void adjust_line_no_table (int bci, int delta);
duke@435	128	void adjust_local_var_table(int bci, int delta);
kamg@2232	129	void adjust_stack_map_table(int bci, int delta);
duke@435	130	int get_orig_switch_pad (int bci, bool is_lookup_switch);
duke@435	131	int rc_instr_len (int bci);
duke@435	132	bool expand_code_array (int delta);
duke@435	133
duke@435	134	// Callback support
duke@435	135	RelocatorListener *_listener;
duke@435	136	void notify(int bci, int delta, int new_code_length) {
duke@435	137	if (_listener != NULL)
duke@435	138	_listener->relocated(bci, delta, new_code_length);
duke@435	139	}
duke@435	140	};
stefank@2314	141
stefank@2314	142	#endif // SHARE_VM_RUNTIME_RELOCATOR_HPP