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comparison src/cpu/x86/vm/methodHandles_x86.hpp @ 6266:1d7922586cf6

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7023639: JSR 292 method handle invocation needs a fast path for compiled code 6984705: JSR 292 method handle creation should not go through JNI Summary: remove assembly code for JDK 7 chained method handles Reviewed-by: jrose, twisti, kvn, mhaupt Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>
author twisti
date Tue, 24 Jul 2012 10:51:00 -0700
parents 5dbed2f542ff
children da91efe96a93
comparison
equal deleted inserted replaced
6241:aba91a731143 6266:1d7922586cf6
25 // Platform-specific definitions for method handles. 25 // Platform-specific definitions for method handles.
26 // These definitions are inlined into class MethodHandles. 26 // These definitions are inlined into class MethodHandles.
27 27
28 // Adapters 28 // Adapters
29 enum /* platform_dependent_constants */ { 29 enum /* platform_dependent_constants */ {
30 adapter_code_size = NOT_LP64(16000 DEBUG_ONLY(+ 15000)) LP64_ONLY(32000 DEBUG_ONLY(+ 120000)) 30 adapter_code_size = NOT_LP64(16000 DEBUG_ONLY(+ 25000)) LP64_ONLY(32000 DEBUG_ONLY(+ 150000))
31 };
32
33 public:
34
35 // The stack just after the recursive call from a ricochet frame
36 // looks something like this. Offsets are marked in words, not bytes.
37 // rsi (r13 on LP64) is part of the interpreter calling sequence
38 // which tells the callee where is my real rsp (for frame walking).
39 // (...lower memory addresses)
40 // rsp: [ return pc ] always the global RicochetBlob::bounce_addr
41 // rsp+1: [ recursive arg N ]
42 // rsp+2: [ recursive arg N-1 ]
43 // ...
44 // rsp+N: [ recursive arg 1 ]
45 // rsp+N+1: [ recursive method handle ]
46 // ...
47 // rbp-6: [ cleanup continuation pc ] <-- (struct RicochetFrame)
48 // rbp-5: [ saved target MH ] the MH we will call on the saved args
49 // rbp-4: [ saved args layout oop ] an int[] array which describes argument layout
50 // rbp-3: [ saved args pointer ] address of transformed adapter arg M (slot 0)
51 // rbp-2: [ conversion ] information about how the return value is used
52 // rbp-1: [ exact sender sp ] exact TOS (rsi/r13) of original sender frame
53 // rbp+0: [ saved sender fp ] (for original sender of AMH)
54 // rbp+1: [ saved sender pc ] (back to original sender of AMH)
55 // rbp+2: [ transformed adapter arg M ] <-- (extended TOS of original sender)
56 // rbp+3: [ transformed adapter arg M-1]
57 // ...
58 // rbp+M+1: [ transformed adapter arg 1 ]
59 // rbp+M+2: [ padding ] <-- (rbp + saved args base offset)
60 // ... [ optional padding]
61 // (higher memory addresses...)
62 //
63 // The arguments originally passed by the original sender
64 // are lost, and arbitrary amounts of stack motion might have
65 // happened due to argument transformation.
66 // (This is done by C2I/I2C adapters and non-direct method handles.)
67 // This is why there is an unpredictable amount of memory between
68 // the extended and exact TOS of the sender.
69 // The ricochet adapter itself will also (in general) perform
70 // transformations before the recursive call.
71 //
72 // The transformed and saved arguments, immediately above the saved
73 // return PC, are a well-formed method handle invocation ready to execute.
74 // When the GC needs to walk the stack, these arguments are described
75 // via the saved arg types oop, an int[] array with a private format.
76 // This array is derived from the type of the transformed adapter
77 // method handle, which also sits at the base of the saved argument
78 // bundle. Since the GC may not be able to fish out the int[]
79 // array, so it is pushed explicitly on the stack. This may be
80 // an unnecessary expense.
81 //
82 // The following register conventions are significant at this point:
83 // rsp the thread stack, as always; preserved by caller
84 // rsi/r13 exact TOS of recursive frame (contents of [rbp-2])
85 // rcx recursive method handle (contents of [rsp+N+1])
86 // rbp preserved by caller (not used by caller)
87 // Unless otherwise specified, all registers can be blown by the call.
88 //
89 // If this frame must be walked, the transformed adapter arguments
90 // will be found with the help of the saved arguments descriptor.
91 //
92 // Therefore, the descriptor must match the referenced arguments.
93 // The arguments must be followed by at least one word of padding,
94 // which will be necessary to complete the final method handle call.
95 // That word is not treated as holding an oop. Neither is the word
96 //
97 // The word pointed to by the return argument pointer is not
98 // treated as an oop, even if points to a saved argument.
99 // This allows the saved argument list to have a "hole" in it
100 // to receive an oop from the recursive call.
101 // (The hole might temporarily contain RETURN_VALUE_PLACEHOLDER.)
102 //
103 // When the recursive callee returns, RicochetBlob::bounce_addr will
104 // immediately jump to the continuation stored in the RF.
105 // This continuation will merge the recursive return value
106 // into the saved argument list. At that point, the original
107 // rsi, rbp, and rsp will be reloaded, the ricochet frame will
108 // disappear, and the final target of the adapter method handle
109 // will be invoked on the transformed argument list.
110
111 class RicochetFrame {
112 friend class MethodHandles;
113 friend class VMStructs;
114
115 private:
116 intptr_t* _continuation; // what to do when control gets back here
117 oopDesc* _saved_target; // target method handle to invoke on saved_args
118 oopDesc* _saved_args_layout; // caching point for MethodTypeForm.vmlayout cookie
119 intptr_t* _saved_args_base; // base of pushed arguments (slot 0, arg N) (-3)
120 intptr_t _conversion; // misc. information from original AdapterMethodHandle (-2)
121 intptr_t* _exact_sender_sp; // parallel to interpreter_frame_sender_sp (-1)
122 intptr_t* _sender_link; // *must* coincide with frame::link_offset (0)
123 address _sender_pc; // *must* coincide with frame::return_addr_offset (1)
124
125 public:
126 intptr_t* continuation() const { return _continuation; }
127 oop saved_target() const { return _saved_target; }
128 oop saved_args_layout() const { return _saved_args_layout; }
129 intptr_t* saved_args_base() const { return _saved_args_base; }
130 intptr_t conversion() const { return _conversion; }
131 intptr_t* exact_sender_sp() const { return _exact_sender_sp; }
132 intptr_t* sender_link() const { return _sender_link; }
133 address sender_pc() const { return _sender_pc; }
134
135 intptr_t* extended_sender_sp() const {
136 // The extended sender SP is above the current RicochetFrame.
137 return (intptr_t*) (((address) this) + sizeof(RicochetFrame));
138 }
139
140 intptr_t return_value_slot_number() const {
141 return adapter_conversion_vminfo(conversion());
142 }
143 BasicType return_value_type() const {
144 return adapter_conversion_dest_type(conversion());
145 }
146 bool has_return_value_slot() const {
147 return return_value_type() != T_VOID;
148 }
149 intptr_t* return_value_slot_addr() const {
150 assert(has_return_value_slot(), "");
151 return saved_arg_slot_addr(return_value_slot_number());
152 }
153 intptr_t* saved_target_slot_addr() const {
154 return saved_arg_slot_addr(saved_args_length());
155 }
156 intptr_t* saved_arg_slot_addr(int slot) const {
157 assert(slot >= 0, "");
158 return (intptr_t*)( (address)saved_args_base() + (slot * Interpreter::stackElementSize) );
159 }
160
161 jint saved_args_length() const;
162 jint saved_arg_offset(int arg) const;
163
164 // GC interface
165 oop* saved_target_addr() { return (oop*)&_saved_target; }
166 oop* saved_args_layout_addr() { return (oop*)&_saved_args_layout; }
167
168 oop compute_saved_args_layout(bool read_cache, bool write_cache);
169
170 // Compiler/assembler interface.
171 static int continuation_offset_in_bytes() { return offset_of(RicochetFrame, _continuation); }
172 static int saved_target_offset_in_bytes() { return offset_of(RicochetFrame, _saved_target); }
173 static int saved_args_layout_offset_in_bytes(){ return offset_of(RicochetFrame, _saved_args_layout); }
174 static int saved_args_base_offset_in_bytes() { return offset_of(RicochetFrame, _saved_args_base); }
175 static int conversion_offset_in_bytes() { return offset_of(RicochetFrame, _conversion); }
176 static int exact_sender_sp_offset_in_bytes() { return offset_of(RicochetFrame, _exact_sender_sp); }
177 static int sender_link_offset_in_bytes() { return offset_of(RicochetFrame, _sender_link); }
178 static int sender_pc_offset_in_bytes() { return offset_of(RicochetFrame, _sender_pc); }
179
180 // This value is not used for much, but it apparently must be nonzero.
181 static int frame_size_in_bytes() { return sender_link_offset_in_bytes(); }
182
183 #ifdef ASSERT
184 // The magic number is supposed to help find ricochet frames within the bytes of stack dumps.
185 enum { MAGIC_NUMBER_1 = 0xFEED03E, MAGIC_NUMBER_2 = 0xBEEF03E };
186 static int magic_number_1_offset_in_bytes() { return -wordSize; }
187 static int magic_number_2_offset_in_bytes() { return sizeof(RicochetFrame); }
188 intptr_t magic_number_1() const { return *(intptr_t*)((address)this + magic_number_1_offset_in_bytes()); };
189 intptr_t magic_number_2() const { return *(intptr_t*)((address)this + magic_number_2_offset_in_bytes()); };
190 #endif //ASSERT
191
192 enum { RETURN_VALUE_PLACEHOLDER = (NOT_DEBUG(0) DEBUG_ONLY(42)) };
193
194 static void verify_offsets() NOT_DEBUG_RETURN;
195 void verify() const NOT_DEBUG_RETURN; // check for MAGIC_NUMBER, etc.
196 void zap_arguments() NOT_DEBUG_RETURN;
197
198 static void generate_ricochet_blob(MacroAssembler* _masm,
199 // output params:
200 int* bounce_offset,
201 int* exception_offset,
202 int* frame_size_in_words);
203
204 static void enter_ricochet_frame(MacroAssembler* _masm,
205 Register rcx_recv,
206 Register rax_argv,
207 address return_handler,
208 Register rbx_temp);
209 static void leave_ricochet_frame(MacroAssembler* _masm,
210 Register rcx_recv,
211 Register new_sp_reg,
212 Register sender_pc_reg);
213
214 static Address frame_address(int offset = 0) {
215 // The RicochetFrame is found by subtracting a constant offset from rbp.
216 return Address(rbp, - sender_link_offset_in_bytes() + offset);
217 }
218
219 static RicochetFrame* from_frame(const frame& fr) {
220 address bp = (address) fr.fp();
221 RicochetFrame* rf = (RicochetFrame*)(bp - sender_link_offset_in_bytes());
222 rf->verify();
223 return rf;
224 }
225
226 static void verify_clean(MacroAssembler* _masm) NOT_DEBUG_RETURN;
227
228 static void describe(const frame* fr, FrameValues& values, int frame_no) PRODUCT_RETURN;
229 }; 31 };
230 32
231 // Additional helper methods for MethodHandles code generation: 33 // Additional helper methods for MethodHandles code generation:
232 public: 34 public:
233 static void load_klass_from_Class(MacroAssembler* _masm, Register klass_reg); 35 static void load_klass_from_Class(MacroAssembler* _masm, Register klass_reg);
234 static void load_conversion_vminfo(MacroAssembler* _masm, Register reg, Address conversion_field_addr);
235 static void load_conversion_dest_type(MacroAssembler* _masm, Register reg, Address conversion_field_addr);
236
237 static void load_stack_move(MacroAssembler* _masm,
238 Register rdi_stack_move,
239 Register rcx_amh,
240 bool might_be_negative);
241
242 static void insert_arg_slots(MacroAssembler* _masm,
243 RegisterOrConstant arg_slots,
244 Register rax_argslot,
245 Register rbx_temp, Register rdx_temp);
246
247 static void remove_arg_slots(MacroAssembler* _masm,
248 RegisterOrConstant arg_slots,
249 Register rax_argslot,
250 Register rbx_temp, Register rdx_temp);
251
252 static void push_arg_slots(MacroAssembler* _masm,
253 Register rax_argslot,
254 RegisterOrConstant slot_count,
255 int skip_words_count,
256 Register rbx_temp, Register rdx_temp);
257
258 static void move_arg_slots_up(MacroAssembler* _masm,
259 Register rbx_bottom, // invariant
260 Address top_addr, // can use rax_temp
261 RegisterOrConstant positive_distance_in_slots,
262 Register rax_temp, Register rdx_temp);
263
264 static void move_arg_slots_down(MacroAssembler* _masm,
265 Address bottom_addr, // can use rax_temp
266 Register rbx_top, // invariant
267 RegisterOrConstant negative_distance_in_slots,
268 Register rax_temp, Register rdx_temp);
269
270 static void move_typed_arg(MacroAssembler* _masm,
271 BasicType type, bool is_element,
272 Address slot_dest, Address value_src,
273 Register rbx_temp, Register rdx_temp);
274
275 static void move_return_value(MacroAssembler* _masm, BasicType type,
276 Address return_slot);
277
278 static void verify_argslot(MacroAssembler* _masm, Register argslot_reg,
279 const char* error_message) NOT_DEBUG_RETURN;
280
281 static void verify_argslots(MacroAssembler* _masm,
282 RegisterOrConstant argslot_count,
283 Register argslot_reg,
284 bool negate_argslot,
285 const char* error_message) NOT_DEBUG_RETURN;
286
287 static void verify_stack_move(MacroAssembler* _masm,
288 RegisterOrConstant arg_slots,
289 int direction) NOT_DEBUG_RETURN;
290 36
291 static void verify_klass(MacroAssembler* _masm, 37 static void verify_klass(MacroAssembler* _masm,
292 Register obj, KlassHandle klass, 38 Register obj, KlassHandle klass,
293 const char* error_message = "wrong klass") NOT_DEBUG_RETURN; 39 const char* error_message = "wrong klass") NOT_DEBUG_RETURN;
294 40
295 static void verify_method_handle(MacroAssembler* _masm, Register mh_reg) { 41 static void verify_method_handle(MacroAssembler* _masm, Register mh_reg) {
296 verify_klass(_masm, mh_reg, SystemDictionaryHandles::MethodHandle_klass(), 42 verify_klass(_masm, mh_reg, SystemDictionaryHandles::MethodHandle_klass(),
297 "reference is a MH"); 43 "reference is a MH");
298 } 44 }
299 45
46 static void verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) NOT_DEBUG_RETURN;
47
300 // Similar to InterpreterMacroAssembler::jump_from_interpreted. 48 // Similar to InterpreterMacroAssembler::jump_from_interpreted.
301 // Takes care of special dispatch from single stepping too. 49 // Takes care of special dispatch from single stepping too.
302 static void jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp); 50 static void jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
51 bool for_compiler_entry);
52
53 static void jump_to_lambda_form(MacroAssembler* _masm,
54 Register recv, Register method_temp,
55 Register temp2,
56 bool for_compiler_entry);
303 57
304 static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN; 58 static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN;
305 59
306 static Register saved_last_sp_register() { 60 static Register saved_last_sp_register() {
307 // Should be in sharedRuntime, not here. 61 // Should be in sharedRuntime, not here.