methodHandles_aarch64.cpp revision 7880:647c8b619d80
1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26#include "precompiled.hpp" 27#include "asm/macroAssembler.hpp" 28#include "interpreter/interpreter.hpp" 29#include "interpreter/interpreterRuntime.hpp" 30#include "memory/allocation.inline.hpp" 31#include "prims/methodHandles.hpp" 32 33#define __ _masm-> 34 35#ifdef PRODUCT 36#define BLOCK_COMMENT(str) /* nothing */ 37#else 38#define BLOCK_COMMENT(str) __ block_comment(str) 39#endif 40 41#define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 42 43void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) { 44 if (VerifyMethodHandles) 45 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), 46 "MH argument is a Class"); 47 __ ldr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes())); 48} 49 50#ifdef ASSERT 51static int check_nonzero(const char* xname, int x) { 52 assert(x != 0, err_msg("%s should be nonzero", xname)); 53 return x; 54} 55#define NONZERO(x) check_nonzero(#x, x) 56#else //ASSERT 57#define NONZERO(x) (x) 58#endif //PRODUCT 59 60#ifdef ASSERT 61void MethodHandles::verify_klass(MacroAssembler* _masm, 62 Register obj, SystemDictionary::WKID klass_id, 63 const char* error_message) { 64 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 65 KlassHandle klass = SystemDictionary::well_known_klass(klass_id); 66 Register temp = rscratch2; 67 Register temp2 = rscratch1; // used by MacroAssembler::cmpptr 68 Label L_ok, L_bad; 69 BLOCK_COMMENT("verify_klass {"); 70 __ verify_oop(obj); 71 __ cbz(obj, L_bad); 72 __ push(RegSet::of(temp, temp2), sp); 73 __ load_klass(temp, obj); 74 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 75 __ br(Assembler::EQ, L_ok); 76 intptr_t super_check_offset = klass->super_check_offset(); 77 __ ldr(temp, Address(temp, super_check_offset)); 78 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 79 __ br(Assembler::EQ, L_ok); 80 __ pop(RegSet::of(temp, temp2), sp); 81 __ bind(L_bad); 82 __ stop(error_message); 83 __ BIND(L_ok); 84 __ pop(RegSet::of(temp, temp2), sp); 85 BLOCK_COMMENT("} verify_klass"); 86} 87 88void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { } 89 90#endif //ASSERT 91 92void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, 93 bool for_compiler_entry) { 94 assert(method == rmethod, "interpreter calling convention"); 95 Label L_no_such_method; 96 __ cbz(rmethod, L_no_such_method); 97 __ verify_method_ptr(method); 98 99 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 100 Label run_compiled_code; 101 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 102 // compiled code in threads for which the event is enabled. Check here for 103 // interp_only_mode if these events CAN be enabled. 104 105 __ ldrb(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset())); 106 __ cbnz(rscratch1, run_compiled_code); 107 __ ldr(rscratch1, Address(method, Method::interpreter_entry_offset())); 108 __ br(rscratch1); 109 __ BIND(run_compiled_code); 110 } 111 112 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 113 Method::from_interpreted_offset(); 114 __ ldr(rscratch1,Address(method, entry_offset)); 115 __ br(rscratch1); 116 __ bind(L_no_such_method); 117 __ far_jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry())); 118} 119 120void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 121 Register recv, Register method_temp, 122 Register temp2, 123 bool for_compiler_entry) { 124 BLOCK_COMMENT("jump_to_lambda_form {"); 125 // This is the initial entry point of a lazy method handle. 126 // After type checking, it picks up the invoker from the LambdaForm. 127 assert_different_registers(recv, method_temp, temp2); 128 assert(recv != noreg, "required register"); 129 assert(method_temp == rmethod, "required register for loading method"); 130 131 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); 132 133 // Load the invoker, as MH -> MH.form -> LF.vmentry 134 __ verify_oop(recv); 135 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()))); 136 __ verify_oop(method_temp); 137 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()))); 138 __ verify_oop(method_temp); 139 // the following assumes that a Method* is normally compressed in the vmtarget field: 140 __ ldr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()))); 141 142 if (VerifyMethodHandles && !for_compiler_entry) { 143 // make sure recv is already on stack 144 __ ldr(temp2, Address(method_temp, Method::const_offset())); 145 __ load_sized_value(temp2, 146 Address(temp2, ConstMethod::size_of_parameters_offset()), 147 sizeof(u2), /*is_signed*/ false); 148 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 149 Label L; 150 __ ldr(rscratch1, __ argument_address(temp2, -1)); 151 __ cmp(recv, rscratch1); 152 __ br(Assembler::EQ, L); 153 __ ldr(r0, __ argument_address(temp2, -1)); 154 __ hlt(0); 155 __ BIND(L); 156 } 157 158 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry); 159 BLOCK_COMMENT("} jump_to_lambda_form"); 160} 161 162// Code generation 163address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 164 vmIntrinsics::ID iid) { 165 const bool not_for_compiler_entry = false; // this is the interpreter entry 166 assert(is_signature_polymorphic(iid), "expected invoke iid"); 167 if (iid == vmIntrinsics::_invokeGeneric || 168 iid == vmIntrinsics::_compiledLambdaForm) { 169 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 170 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 171 // They all allow an appendix argument. 172 __ hlt(0); // empty stubs make SG sick 173 return NULL; 174 } 175 176 // r13: sender SP (must preserve; see prepare_to_jump_from_interpreted) 177 // rmethod: Method* 178 // r3: argument locator (parameter slot count, added to rsp) 179 // r1: used as temp to hold mh or receiver 180 // r0, r11: garbage temps, blown away 181 Register argp = r3; // argument list ptr, live on error paths 182 Register temp = r0; 183 Register mh = r1; // MH receiver; dies quickly and is recycled 184 185 // here's where control starts out: 186 __ align(CodeEntryAlignment); 187 address entry_point = __ pc(); 188 189 if (VerifyMethodHandles) { 190 Label L; 191 BLOCK_COMMENT("verify_intrinsic_id {"); 192 __ ldrb(rscratch1, Address(rmethod, Method::intrinsic_id_offset_in_bytes())); 193 __ cmp(rscratch1, (int) iid); 194 __ br(Assembler::EQ, L); 195 if (iid == vmIntrinsics::_linkToVirtual || 196 iid == vmIntrinsics::_linkToSpecial) { 197 // could do this for all kinds, but would explode assembly code size 198 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 199 } 200 __ hlt(0); 201 __ bind(L); 202 BLOCK_COMMENT("} verify_intrinsic_id"); 203 } 204 205 // First task: Find out how big the argument list is. 206 Address r3_first_arg_addr; 207 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 208 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 209 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 210 __ ldr(argp, Address(rmethod, Method::const_offset())); 211 __ load_sized_value(argp, 212 Address(argp, ConstMethod::size_of_parameters_offset()), 213 sizeof(u2), /*is_signed*/ false); 214 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 215 r3_first_arg_addr = __ argument_address(argp, -1); 216 } else { 217 DEBUG_ONLY(argp = noreg); 218 } 219 220 if (!is_signature_polymorphic_static(iid)) { 221 __ ldr(mh, r3_first_arg_addr); 222 DEBUG_ONLY(argp = noreg); 223 } 224 225 // r3_first_arg_addr is live! 226 227 trace_method_handle_interpreter_entry(_masm, iid); 228 if (iid == vmIntrinsics::_invokeBasic) { 229 generate_method_handle_dispatch(_masm, iid, mh, noreg, not_for_compiler_entry); 230 231 } else { 232 // Adjust argument list by popping the trailing MemberName argument. 233 Register recv = noreg; 234 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 235 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 236 __ ldr(recv = r2, r3_first_arg_addr); 237 } 238 DEBUG_ONLY(argp = noreg); 239 Register rmember = rmethod; // MemberName ptr; incoming method ptr is dead now 240 __ pop(rmember); // extract last argument 241 generate_method_handle_dispatch(_masm, iid, recv, rmember, not_for_compiler_entry); 242 } 243 244 return entry_point; 245} 246 247 248void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 249 vmIntrinsics::ID iid, 250 Register receiver_reg, 251 Register member_reg, 252 bool for_compiler_entry) { 253 assert(is_signature_polymorphic(iid), "expected invoke iid"); 254 // temps used in this code are not used in *either* compiled or interpreted calling sequences 255 Register temp1 = r10; 256 Register temp2 = r11; 257 Register temp3 = r14; // r13 is live by this point: it contains the sender SP 258 if (for_compiler_entry) { 259 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment"); 260 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 261 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 262 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 263 } 264 265 assert_different_registers(temp1, temp2, temp3, receiver_reg); 266 assert_different_registers(temp1, temp2, temp3, member_reg); 267 268 if (iid == vmIntrinsics::_invokeBasic) { 269 // indirect through MH.form.vmentry.vmtarget 270 jump_to_lambda_form(_masm, receiver_reg, rmethod, temp1, for_compiler_entry); 271 272 } else { 273 // The method is a member invoker used by direct method handles. 274 if (VerifyMethodHandles) { 275 // make sure the trailing argument really is a MemberName (caller responsibility) 276 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName), 277 "MemberName required for invokeVirtual etc."); 278 } 279 280 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 281 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 282 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())); 283 284 Register temp1_recv_klass = temp1; 285 if (iid != vmIntrinsics::_linkToStatic) { 286 __ verify_oop(receiver_reg); 287 if (iid == vmIntrinsics::_linkToSpecial) { 288 // Don't actually load the klass; just null-check the receiver. 289 __ null_check(receiver_reg); 290 } else { 291 // load receiver klass itself 292 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 293 __ load_klass(temp1_recv_klass, receiver_reg); 294 __ verify_klass_ptr(temp1_recv_klass); 295 } 296 BLOCK_COMMENT("check_receiver {"); 297 // The receiver for the MemberName must be in receiver_reg. 298 // Check the receiver against the MemberName.clazz 299 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 300 // Did not load it above... 301 __ load_klass(temp1_recv_klass, receiver_reg); 302 __ verify_klass_ptr(temp1_recv_klass); 303 } 304 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 305 Label L_ok; 306 Register temp2_defc = temp2; 307 __ load_heap_oop(temp2_defc, member_clazz); 308 load_klass_from_Class(_masm, temp2_defc); 309 __ verify_klass_ptr(temp2_defc); 310 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok); 311 // If we get here, the type check failed! 312 __ hlt(0); 313 // __ STOP("receiver class disagrees with MemberName.clazz"); 314 __ bind(L_ok); 315 } 316 BLOCK_COMMENT("} check_receiver"); 317 } 318 if (iid == vmIntrinsics::_linkToSpecial || 319 iid == vmIntrinsics::_linkToStatic) { 320 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 321 } 322 323 // Live registers at this point: 324 // member_reg - MemberName that was the trailing argument 325 // temp1_recv_klass - klass of stacked receiver, if needed 326 // r13 - interpreter linkage (if interpreted) ??? FIXME 327 // r1 ... r0 - compiler arguments (if compiled) 328 329 Label L_incompatible_class_change_error; 330 switch (iid) { 331 case vmIntrinsics::_linkToSpecial: 332 if (VerifyMethodHandles) { 333 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); 334 } 335 __ ldr(rmethod, member_vmtarget); 336 break; 337 338 case vmIntrinsics::_linkToStatic: 339 if (VerifyMethodHandles) { 340 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 341 } 342 __ ldr(rmethod, member_vmtarget); 343 break; 344 345 case vmIntrinsics::_linkToVirtual: 346 { 347 // same as TemplateTable::invokevirtual, 348 // minus the CP setup and profiling: 349 350 if (VerifyMethodHandles) { 351 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); 352 } 353 354 // pick out the vtable index from the MemberName, and then we can discard it: 355 Register temp2_index = temp2; 356 __ ldr(temp2_index, member_vmindex); 357 358 if (VerifyMethodHandles) { 359 Label L_index_ok; 360 __ cmpw(temp2_index, 0U); 361 __ br(Assembler::GE, L_index_ok); 362 __ hlt(0); 363 __ BIND(L_index_ok); 364 } 365 366 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 367 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 368 369 // get target Method* & entry point 370 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rmethod); 371 break; 372 } 373 374 case vmIntrinsics::_linkToInterface: 375 { 376 // same as TemplateTable::invokeinterface 377 // (minus the CP setup and profiling, with different argument motion) 378 if (VerifyMethodHandles) { 379 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 380 } 381 382 Register temp3_intf = temp3; 383 __ load_heap_oop(temp3_intf, member_clazz); 384 load_klass_from_Class(_masm, temp3_intf); 385 __ verify_klass_ptr(temp3_intf); 386 387 Register rindex = rmethod; 388 __ ldr(rindex, member_vmindex); 389 if (VerifyMethodHandles) { 390 Label L; 391 __ cmpw(rindex, 0U); 392 __ br(Assembler::GE, L); 393 __ hlt(0); 394 __ bind(L); 395 } 396 397 // given intf, index, and recv klass, dispatch to the implementation method 398 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 399 // note: next two args must be the same: 400 rindex, rmethod, 401 temp2, 402 L_incompatible_class_change_error); 403 break; 404 } 405 406 default: 407 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid))); 408 break; 409 } 410 411 // live at this point: rmethod, r13 (if interpreted) 412 413 // After figuring out which concrete method to call, jump into it. 414 // Note that this works in the interpreter with no data motion. 415 // But the compiled version will require that r2_recv be shifted out. 416 __ verify_method_ptr(rmethod); 417 jump_from_method_handle(_masm, rmethod, temp1, for_compiler_entry); 418 if (iid == vmIntrinsics::_linkToInterface) { 419 __ bind(L_incompatible_class_change_error); 420 __ far_jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); 421 } 422 } 423} 424 425#ifndef PRODUCT 426void trace_method_handle_stub(const char* adaptername, 427 oop mh, 428 intptr_t* saved_regs, 429 intptr_t* entry_sp) { } 430 431// The stub wraps the arguments in a struct on the stack to avoid 432// dealing with the different calling conventions for passing 6 433// arguments. 434struct MethodHandleStubArguments { 435 const char* adaptername; 436 oopDesc* mh; 437 intptr_t* saved_regs; 438 intptr_t* entry_sp; 439}; 440void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { } 441 442void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { } 443#endif //PRODUCT 444