1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Platform-specific definitions for method handles.
26 // These definitions are inlined into class MethodHandles.
27
28 // Adapters
29 enum /* platform_dependent_constants */ {
30 adapter_code_size = NOT_LP64(22000 DEBUG_ONLY(+ 40000)) LP64_ONLY(32000 DEBUG_ONLY(+ 80000))
31 };
32
33 public:
34
35 class RicochetFrame : public ResourceObj {
36 friend class MethodHandles;
37
38 private:
39 /*
40 RF field x86 SPARC
41 sender_pc *(rsp+0) I7-0x8
42 sender_link rbp I6+BIAS
43 exact_sender_sp rsi/r13 I5_savedSP
44 conversion *(rcx+&amh_conv) L5_conv
45 saved_args_base rax L4_sab (cf. Gargs = G4)
46 saved_args_layout #NULL L3_sal
47 saved_target *(rcx+&mh_vmtgt) L2_stgt
48 continuation #STUB_CON L1_cont
49 */
50 static const Register L1_continuation ; // what to do when control gets back here
51 static const Register L2_saved_target ; // target method handle to invoke on saved_args
52 static const Register L3_saved_args_layout; // caching point for MethodTypeForm.vmlayout cookie
53 static const Register L4_saved_args_base ; // base of pushed arguments (slot 0, arg N) (-3)
54 static const Register L5_conversion ; // misc. information from original AdapterMethodHandle (-2)
55
56 frame _fr;
57
58 RicochetFrame(const frame& fr) : _fr(fr) { }
59
60 intptr_t* register_addr(Register reg) const {
61 assert((_fr.sp() + reg->sp_offset_in_saved_window()) == _fr.register_addr(reg), "must agree");
62 return _fr.register_addr(reg);
63 }
64 intptr_t register_value(Register reg) const { return *register_addr(reg); }
65
66 public:
67 intptr_t* continuation() const { return (intptr_t*) register_value(L1_continuation); }
68 oop saved_target() const { return (oop) register_value(L2_saved_target); }
69 oop saved_args_layout() const { return (oop) register_value(L3_saved_args_layout); }
70 intptr_t* saved_args_base() const { return (intptr_t*) register_value(L4_saved_args_base); }
71 intptr_t conversion() const { return register_value(L5_conversion); }
72 intptr_t* exact_sender_sp() const { return (intptr_t*) register_value(I5_savedSP); }
73 intptr_t* sender_link() const { return _fr.sender_sp(); } // XXX
74 address sender_pc() const { return _fr.sender_pc(); }
75
76 // This value is not used for much, but it apparently must be nonzero.
77 static int frame_size_in_bytes() { return wordSize * 4; }
78
79 intptr_t* extended_sender_sp() const { return saved_args_base(); }
80
81 intptr_t return_value_slot_number() const {
82 return adapter_conversion_vminfo(conversion());
83 }
84 BasicType return_value_type() const {
85 return adapter_conversion_dest_type(conversion());
86 }
87 bool has_return_value_slot() const {
88 return return_value_type() != T_VOID;
89 }
90 intptr_t* return_value_slot_addr() const {
91 assert(has_return_value_slot(), "");
92 return saved_arg_slot_addr(return_value_slot_number());
93 }
94 intptr_t* saved_target_slot_addr() const {
95 return saved_arg_slot_addr(saved_args_length());
96 }
97 intptr_t* saved_arg_slot_addr(int slot) const {
98 assert(slot >= 0, "");
99 return (intptr_t*)( (address)saved_args_base() + (slot * Interpreter::stackElementSize) );
100 }
101
102 jint saved_args_length() const;
103 jint saved_arg_offset(int arg) const;
104
105 // GC interface
106 oop* saved_target_addr() { return (oop*)register_addr(L2_saved_target); }
107 oop* saved_args_layout_addr() { return (oop*)register_addr(L3_saved_args_layout); }
108
109 oop compute_saved_args_layout(bool read_cache, bool write_cache);
110
111 #ifdef ASSERT
112 // The magic number is supposed to help find ricochet frames within the bytes of stack dumps.
113 enum { MAGIC_NUMBER_1 = 0xFEED03E, MAGIC_NUMBER_2 = 0xBEEF03E };
114 static const Register L0_magic_number_1 ; // cookie for debugging, at start of RSA
115 static Address magic_number_2_addr() { return Address(L4_saved_args_base, -wordSize); }
116 intptr_t magic_number_1() const { return register_value(L0_magic_number_1); }
117 intptr_t magic_number_2() const { return saved_args_base()[-1]; }
118 #endif //ASSERT
119
120 public:
121 enum { RETURN_VALUE_PLACEHOLDER = (NOT_DEBUG(0) DEBUG_ONLY(42)) };
122
123 void verify() const NOT_DEBUG_RETURN; // check for MAGIC_NUMBER, etc.
124
125 static void generate_ricochet_blob(MacroAssembler* _masm,
126 // output params:
127 int* bounce_offset,
128 int* exception_offset,
129 int* frame_size_in_words);
130
131 static void enter_ricochet_frame(MacroAssembler* _masm,
132 Register recv_reg,
133 Register argv_reg,
134 address return_handler);
135
136 static void leave_ricochet_frame(MacroAssembler* _masm,
137 Register recv_reg,
138 Register new_sp_reg,
139 Register sender_pc_reg);
140
141 static RicochetFrame* from_frame(const frame& fr) {
142 RicochetFrame* rf = new RicochetFrame(fr);
143 rf->verify();
144 return rf;
145 }
146
147 static void verify_clean(MacroAssembler* _masm) NOT_DEBUG_RETURN;
148 };
149
150 // Additional helper methods for MethodHandles code generation:
151 public:
152 static void load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg);
153 static void load_conversion_vminfo(MacroAssembler* _masm, Address conversion_field_addr, Register reg);
154 static void extract_conversion_vminfo(MacroAssembler* _masm, Register conversion_field_reg, Register reg);
155 static void extract_conversion_dest_type(MacroAssembler* _masm, Register conversion_field_reg, Register reg);
156
157 static void load_stack_move(MacroAssembler* _masm,
158 Address G3_amh_conversion,
159 Register G5_stack_move);
160
161 static void insert_arg_slots(MacroAssembler* _masm,
162 RegisterOrConstant arg_slots,
163 Register argslot_reg,
164 Register temp_reg, Register temp2_reg, Register temp3_reg);
165
166 static void remove_arg_slots(MacroAssembler* _masm,
167 RegisterOrConstant arg_slots,
168 Register argslot_reg,
169 Register temp_reg, Register temp2_reg, Register temp3_reg);
170
171 static void push_arg_slots(MacroAssembler* _masm,
172 Register argslot_reg,
173 RegisterOrConstant slot_count,
174 Register temp_reg, Register temp2_reg);
175
176 static void move_arg_slots_up(MacroAssembler* _masm,
177 Register bottom_reg, // invariant
178 Address top_addr, // can use temp_reg
179 RegisterOrConstant positive_distance_in_slots,
180 Register temp_reg, Register temp2_reg);
181
182 static void move_arg_slots_down(MacroAssembler* _masm,
183 Address bottom_addr, // can use temp_reg
184 Register top_reg, // invariant
185 RegisterOrConstant negative_distance_in_slots,
186 Register temp_reg, Register temp2_reg);
187
188 static void move_typed_arg(MacroAssembler* _masm,
189 BasicType type, bool is_element,
190 Address value_src, Address slot_dest,
191 Register temp_reg);
192
193 static void move_return_value(MacroAssembler* _masm, BasicType type,
194 Address return_slot);
195
196 static void verify_argslot(MacroAssembler* _masm, Register argslot_reg,
197 Register temp_reg,
198 const char* error_message) NOT_DEBUG_RETURN;
199
200 static void verify_argslots(MacroAssembler* _masm,
201 RegisterOrConstant argslot_count,
202 Register argslot_reg,
203 Register temp_reg,
204 Register temp2_reg,
205 bool negate_argslot,
206 const char* error_message) NOT_DEBUG_RETURN;
207
208 static void verify_stack_move(MacroAssembler* _masm,
209 RegisterOrConstant arg_slots,
210 int direction) NOT_DEBUG_RETURN;
211
212 static void verify_klass(MacroAssembler* _masm,
213 Register obj_reg, KlassHandle klass,
214 Register temp_reg, Register temp2_reg,
215 const char* error_message = "wrong klass") NOT_DEBUG_RETURN;
216
217 static void verify_method_handle(MacroAssembler* _masm, Register mh_reg,
218 Register temp_reg, Register temp2_reg) {
219 verify_klass(_masm, mh_reg, SystemDictionaryHandles::MethodHandle_klass(),
220 temp_reg, temp2_reg,
221 "reference is a MH");
222 }
223
224 // Similar to InterpreterMacroAssembler::jump_from_interpreted.
225 // Takes care of special dispatch from single stepping too.
226 static void jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, Register temp2);
227
228 static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN;