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annotate src/cpu/x86/vm/methodHandles_x86.hpp @ 3442:f7d55ea6ee56
7045514: SPARC assembly code for JSR 292 ricochet frames
Reviewed-by: kvn, jrose
| author | never |
|---|---|
| date | Fri, 03 Jun 2011 22:31:43 -0700 |
| parents | 167b70ff3abc |
| children | 341a57af9b0a |
| rev | line source |
|---|---|
| 3363 | 1 /* |
| 2 * Copyright (c) 2010, 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 | |
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28 // Adapters |
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29 enum /* platform_dependent_constants */ { |
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30 adapter_code_size = NOT_LP64(30000 DEBUG_ONLY(+ 10000)) LP64_ONLY(80000 DEBUG_ONLY(+ 120000)) |
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31 }; |
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32 |
| 3363 | 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 | |
| 114 private: | |
| 115 intptr_t* _continuation; // what to do when control gets back here | |
| 116 oopDesc* _saved_target; // target method handle to invoke on saved_args | |
| 117 oopDesc* _saved_args_layout; // caching point for MethodTypeForm.vmlayout cookie | |
| 118 intptr_t* _saved_args_base; // base of pushed arguments (slot 0, arg N) (-3) | |
| 119 intptr_t _conversion; // misc. information from original AdapterMethodHandle (-2) | |
| 120 intptr_t* _exact_sender_sp; // parallel to interpreter_frame_sender_sp (-1) | |
| 121 intptr_t* _sender_link; // *must* coincide with frame::link_offset (0) | |
| 122 address _sender_pc; // *must* coincide with frame::return_addr_offset (1) | |
| 123 | |
| 124 public: | |
| 125 intptr_t* continuation() const { return _continuation; } | |
| 126 oop saved_target() const { return _saved_target; } | |
| 127 oop saved_args_layout() const { return _saved_args_layout; } | |
| 128 intptr_t* saved_args_base() const { return _saved_args_base; } | |
| 129 intptr_t conversion() const { return _conversion; } | |
| 130 intptr_t* exact_sender_sp() const { return _exact_sender_sp; } | |
| 131 intptr_t* sender_link() const { return _sender_link; } | |
| 132 address sender_pc() const { return _sender_pc; } | |
| 133 | |
| 134 intptr_t* extended_sender_sp() const { return saved_args_base(); } | |
| 135 | |
| 136 intptr_t return_value_slot_number() const { | |
| 137 return adapter_conversion_vminfo(conversion()); | |
| 138 } | |
| 139 BasicType return_value_type() const { | |
| 140 return adapter_conversion_dest_type(conversion()); | |
| 141 } | |
| 142 bool has_return_value_slot() const { | |
| 143 return return_value_type() != T_VOID; | |
| 144 } | |
| 145 intptr_t* return_value_slot_addr() const { | |
| 146 assert(has_return_value_slot(), ""); | |
| 147 return saved_arg_slot_addr(return_value_slot_number()); | |
| 148 } | |
| 149 intptr_t* saved_target_slot_addr() const { | |
| 150 return saved_arg_slot_addr(saved_args_length()); | |
| 151 } | |
| 152 intptr_t* saved_arg_slot_addr(int slot) const { | |
| 153 assert(slot >= 0, ""); | |
| 154 return (intptr_t*)( (address)saved_args_base() + (slot * Interpreter::stackElementSize) ); | |
| 155 } | |
| 156 | |
| 157 jint saved_args_length() const; | |
| 158 jint saved_arg_offset(int arg) const; | |
| 159 | |
| 160 // GC interface | |
| 161 oop* saved_target_addr() { return (oop*)&_saved_target; } | |
| 162 oop* saved_args_layout_addr() { return (oop*)&_saved_args_layout; } | |
| 163 | |
| 164 oop compute_saved_args_layout(bool read_cache, bool write_cache); | |
| 165 | |
| 166 // Compiler/assembler interface. | |
| 167 static int continuation_offset_in_bytes() { return offset_of(RicochetFrame, _continuation); } | |
| 168 static int saved_target_offset_in_bytes() { return offset_of(RicochetFrame, _saved_target); } | |
| 169 static int saved_args_layout_offset_in_bytes(){ return offset_of(RicochetFrame, _saved_args_layout); } | |
| 170 static int saved_args_base_offset_in_bytes() { return offset_of(RicochetFrame, _saved_args_base); } | |
| 171 static int conversion_offset_in_bytes() { return offset_of(RicochetFrame, _conversion); } | |
| 172 static int exact_sender_sp_offset_in_bytes() { return offset_of(RicochetFrame, _exact_sender_sp); } | |
| 173 static int sender_link_offset_in_bytes() { return offset_of(RicochetFrame, _sender_link); } | |
| 174 static int sender_pc_offset_in_bytes() { return offset_of(RicochetFrame, _sender_pc); } | |
| 175 | |
| 176 // This value is not used for much, but it apparently must be nonzero. | |
| 177 static int frame_size_in_bytes() { return sender_link_offset_in_bytes(); } | |
| 178 | |
| 179 #ifdef ASSERT | |
| 180 // The magic number is supposed to help find ricochet frames within the bytes of stack dumps. | |
| 181 enum { MAGIC_NUMBER_1 = 0xFEED03E, MAGIC_NUMBER_2 = 0xBEEF03E }; | |
| 182 static int magic_number_1_offset_in_bytes() { return -wordSize; } | |
| 183 static int magic_number_2_offset_in_bytes() { return sizeof(RicochetFrame); } | |
| 184 intptr_t magic_number_1() const { return *(intptr_t*)((address)this + magic_number_1_offset_in_bytes()); }; | |
| 185 intptr_t magic_number_2() const { return *(intptr_t*)((address)this + magic_number_2_offset_in_bytes()); }; | |
| 186 #endif //ASSERT | |
| 187 | |
| 188 enum { RETURN_VALUE_PLACEHOLDER = (NOT_DEBUG(0) DEBUG_ONLY(42)) }; | |
| 189 | |
| 190 static void verify_offsets() NOT_DEBUG_RETURN; | |
| 191 void verify() const NOT_DEBUG_RETURN; // check for MAGIC_NUMBER, etc. | |
| 192 void zap_arguments() NOT_DEBUG_RETURN; | |
| 193 | |
| 194 static void generate_ricochet_blob(MacroAssembler* _masm, | |
| 195 // output params: | |
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196 int* bounce_offset, |
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197 int* exception_offset, |
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198 int* frame_size_in_words); |
| 3363 | 199 |
| 200 static void enter_ricochet_frame(MacroAssembler* _masm, | |
| 201 Register rcx_recv, | |
| 202 Register rax_argv, | |
| 203 address return_handler, | |
| 204 Register rbx_temp); | |
| 205 static void leave_ricochet_frame(MacroAssembler* _masm, | |
| 206 Register rcx_recv, | |
| 207 Register new_sp_reg, | |
| 208 Register sender_pc_reg); | |
| 209 | |
| 210 static Address frame_address(int offset = 0) { | |
| 211 // The RicochetFrame is found by subtracting a constant offset from rbp. | |
| 212 return Address(rbp, - sender_link_offset_in_bytes() + offset); | |
| 213 } | |
| 214 | |
| 215 static RicochetFrame* from_frame(const frame& fr) { | |
| 216 address bp = (address) fr.fp(); | |
| 217 RicochetFrame* rf = (RicochetFrame*)(bp - sender_link_offset_in_bytes()); | |
| 218 rf->verify(); | |
| 219 return rf; | |
| 220 } | |
| 221 | |
| 222 static void verify_clean(MacroAssembler* _masm) NOT_DEBUG_RETURN; | |
| 223 }; | |
| 224 | |
| 225 // Additional helper methods for MethodHandles code generation: | |
| 226 public: | |
| 227 static void load_klass_from_Class(MacroAssembler* _masm, Register klass_reg); | |
| 228 static void load_conversion_vminfo(MacroAssembler* _masm, Register reg, Address conversion_field_addr); | |
| 229 static void load_conversion_dest_type(MacroAssembler* _masm, Register reg, Address conversion_field_addr); | |
| 230 | |
| 231 static void load_stack_move(MacroAssembler* _masm, | |
| 232 Register rdi_stack_move, | |
| 233 Register rcx_amh, | |
| 234 bool might_be_negative); | |
| 235 | |
| 236 static void insert_arg_slots(MacroAssembler* _masm, | |
| 237 RegisterOrConstant arg_slots, | |
| 238 Register rax_argslot, | |
| 239 Register rbx_temp, Register rdx_temp); | |
| 240 | |
| 241 static void remove_arg_slots(MacroAssembler* _masm, | |
| 242 RegisterOrConstant arg_slots, | |
| 243 Register rax_argslot, | |
| 244 Register rbx_temp, Register rdx_temp); | |
| 245 | |
| 246 static void push_arg_slots(MacroAssembler* _masm, | |
| 247 Register rax_argslot, | |
| 248 RegisterOrConstant slot_count, | |
| 249 int skip_words_count, | |
| 250 Register rbx_temp, Register rdx_temp); | |
| 251 | |
| 252 static void move_arg_slots_up(MacroAssembler* _masm, | |
| 253 Register rbx_bottom, // invariant | |
| 254 Address top_addr, // can use rax_temp | |
| 255 RegisterOrConstant positive_distance_in_slots, | |
| 256 Register rax_temp, Register rdx_temp); | |
| 257 | |
| 258 static void move_arg_slots_down(MacroAssembler* _masm, | |
| 259 Address bottom_addr, // can use rax_temp | |
| 260 Register rbx_top, // invariant | |
| 261 RegisterOrConstant negative_distance_in_slots, | |
| 262 Register rax_temp, Register rdx_temp); | |
| 263 | |
| 264 static void move_typed_arg(MacroAssembler* _masm, | |
| 265 BasicType type, bool is_element, | |
| 266 Address slot_dest, Address value_src, | |
| 267 Register rbx_temp, Register rdx_temp); | |
| 268 | |
| 269 static void move_return_value(MacroAssembler* _masm, BasicType type, | |
| 270 Address return_slot); | |
| 271 | |
| 272 static void verify_argslot(MacroAssembler* _masm, Register argslot_reg, | |
| 273 const char* error_message) NOT_DEBUG_RETURN; | |
| 274 | |
| 275 static void verify_argslots(MacroAssembler* _masm, | |
| 276 RegisterOrConstant argslot_count, | |
| 277 Register argslot_reg, | |
| 278 bool negate_argslot, | |
| 279 const char* error_message) NOT_DEBUG_RETURN; | |
| 280 | |
| 281 static void verify_stack_move(MacroAssembler* _masm, | |
| 282 RegisterOrConstant arg_slots, | |
| 283 int direction) NOT_DEBUG_RETURN; | |
| 284 | |
| 285 static void verify_klass(MacroAssembler* _masm, | |
| 286 Register obj, KlassHandle klass, | |
| 287 const char* error_message = "wrong klass") NOT_DEBUG_RETURN; | |
| 288 | |
| 289 static void verify_method_handle(MacroAssembler* _masm, Register mh_reg) { | |
| 290 verify_klass(_masm, mh_reg, SystemDictionaryHandles::MethodHandle_klass(), | |
| 291 "reference is a MH"); | |
| 292 } | |
| 293 | |
| 294 static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN; | |
| 295 | |
| 296 static Register saved_last_sp_register() { | |
| 297 // Should be in sharedRuntime, not here. | |
| 298 return LP64_ONLY(r13) NOT_LP64(rsi); | |
| 299 } |