1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "art_method-inl.h" 18 #include "base/enums.h" 19 #include "callee_save_frame.h" 20 #include "common_throws.h" 21 #include "dex_file-inl.h" 22 #include "dex_instruction-inl.h" 23 #include "entrypoints/entrypoint_utils-inl.h" 24 #include "entrypoints/runtime_asm_entrypoints.h" 25 #include "gc/accounting/card_table-inl.h" 26 #include "imt_conflict_table.h" 27 #include "imtable-inl.h" 28 #include "interpreter/interpreter.h" 29 #include "linear_alloc.h" 30 #include "method_handles.h" 31 #include "method_reference.h" 32 #include "mirror/class-inl.h" 33 #include "mirror/dex_cache-inl.h" 34 #include "mirror/method.h" 35 #include "mirror/method_handle_impl.h" 36 #include "mirror/object-inl.h" 37 #include "mirror/object_array-inl.h" 38 #include "oat_quick_method_header.h" 39 #include "quick_exception_handler.h" 40 #include "runtime.h" 41 #include "scoped_thread_state_change-inl.h" 42 #include "stack.h" 43 #include "debugger.h" 44 #include "well_known_classes.h" 45 46 namespace art { 47 48 // Visits the arguments as saved to the stack by a Runtime::kRefAndArgs callee save frame. 49 class QuickArgumentVisitor { 50 // Number of bytes for each out register in the caller method's frame. 51 static constexpr size_t kBytesStackArgLocation = 4; 52 // Frame size in bytes of a callee-save frame for RefsAndArgs. 53 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 54 GetCalleeSaveFrameSize(kRuntimeISA, Runtime::kSaveRefsAndArgs); 55 #if defined(__arm__) 56 // The callee save frame is pointed to by SP. 57 // | argN | | 58 // | ... | | 59 // | arg4 | | 60 // | arg3 spill | | Caller's frame 61 // | arg2 spill | | 62 // | arg1 spill | | 63 // | Method* | --- 64 // | LR | 65 // | ... | 4x6 bytes callee saves 66 // | R3 | 67 // | R2 | 68 // | R1 | 69 // | S15 | 70 // | : | 71 // | S0 | 72 // | | 4x2 bytes padding 73 // | Method* | <- sp 74 static constexpr bool kSplitPairAcrossRegisterAndStack = kArm32QuickCodeUseSoftFloat; 75 static constexpr bool kAlignPairRegister = !kArm32QuickCodeUseSoftFloat; 76 static constexpr bool kQuickSoftFloatAbi = kArm32QuickCodeUseSoftFloat; 77 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = !kArm32QuickCodeUseSoftFloat; 78 static constexpr bool kQuickSkipOddFpRegisters = false; 79 static constexpr size_t kNumQuickGprArgs = 3; 80 static constexpr size_t kNumQuickFprArgs = kArm32QuickCodeUseSoftFloat ? 0 : 16; 81 static constexpr bool kGprFprLockstep = false; 82 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 83 arm::ArmCalleeSaveFpr1Offset(Runtime::kSaveRefsAndArgs); // Offset of first FPR arg. 84 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 85 arm::ArmCalleeSaveGpr1Offset(Runtime::kSaveRefsAndArgs); // Offset of first GPR arg. 86 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 87 arm::ArmCalleeSaveLrOffset(Runtime::kSaveRefsAndArgs); // Offset of return address. 88 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 89 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 90 } 91 #elif defined(__aarch64__) 92 // The callee save frame is pointed to by SP. 93 // | argN | | 94 // | ... | | 95 // | arg4 | | 96 // | arg3 spill | | Caller's frame 97 // | arg2 spill | | 98 // | arg1 spill | | 99 // | Method* | --- 100 // | LR | 101 // | X29 | 102 // | : | 103 // | X20 | 104 // | X7 | 105 // | : | 106 // | X1 | 107 // | D7 | 108 // | : | 109 // | D0 | 110 // | | padding 111 // | Method* | <- sp 112 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 113 static constexpr bool kAlignPairRegister = false; 114 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 115 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 116 static constexpr bool kQuickSkipOddFpRegisters = false; 117 static constexpr size_t kNumQuickGprArgs = 7; // 7 arguments passed in GPRs. 118 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 119 static constexpr bool kGprFprLockstep = false; 120 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 121 arm64::Arm64CalleeSaveFpr1Offset(Runtime::kSaveRefsAndArgs); // Offset of first FPR arg. 122 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 123 arm64::Arm64CalleeSaveGpr1Offset(Runtime::kSaveRefsAndArgs); // Offset of first GPR arg. 124 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 125 arm64::Arm64CalleeSaveLrOffset(Runtime::kSaveRefsAndArgs); // Offset of return address. 126 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 127 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 128 } 129 #elif defined(__mips__) && !defined(__LP64__) 130 // The callee save frame is pointed to by SP. 131 // | argN | | 132 // | ... | | 133 // | arg4 | | 134 // | arg3 spill | | Caller's frame 135 // | arg2 spill | | 136 // | arg1 spill | | 137 // | Method* | --- 138 // | RA | 139 // | ... | callee saves 140 // | T1 | arg5 141 // | T0 | arg4 142 // | A3 | arg3 143 // | A2 | arg2 144 // | A1 | arg1 145 // | F19 | 146 // | F18 | f_arg5 147 // | F17 | 148 // | F16 | f_arg4 149 // | F15 | 150 // | F14 | f_arg3 151 // | F13 | 152 // | F12 | f_arg2 153 // | F11 | 154 // | F10 | f_arg1 155 // | F9 | 156 // | F8 | f_arg0 157 // | | padding 158 // | A0/Method* | <- sp 159 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 160 static constexpr bool kAlignPairRegister = true; 161 static constexpr bool kQuickSoftFloatAbi = false; 162 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 163 static constexpr bool kQuickSkipOddFpRegisters = true; 164 static constexpr size_t kNumQuickGprArgs = 5; // 5 arguments passed in GPRs. 165 static constexpr size_t kNumQuickFprArgs = 12; // 6 arguments passed in FPRs. Floats can be 166 // passed only in even numbered registers and each 167 // double occupies two registers. 168 static constexpr bool kGprFprLockstep = false; 169 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 8; // Offset of first FPR arg. 170 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 56; // Offset of first GPR arg. 171 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 108; // Offset of return address. 172 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 173 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 174 } 175 #elif defined(__mips__) && defined(__LP64__) 176 // The callee save frame is pointed to by SP. 177 // | argN | | 178 // | ... | | 179 // | arg4 | | 180 // | arg3 spill | | Caller's frame 181 // | arg2 spill | | 182 // | arg1 spill | | 183 // | Method* | --- 184 // | RA | 185 // | ... | callee saves 186 // | A7 | arg7 187 // | A6 | arg6 188 // | A5 | arg5 189 // | A4 | arg4 190 // | A3 | arg3 191 // | A2 | arg2 192 // | A1 | arg1 193 // | F19 | f_arg7 194 // | F18 | f_arg6 195 // | F17 | f_arg5 196 // | F16 | f_arg4 197 // | F15 | f_arg3 198 // | F14 | f_arg2 199 // | F13 | f_arg1 200 // | F12 | f_arg0 201 // | | padding 202 // | A0/Method* | <- sp 203 // NOTE: for Mip64, when A0 is skipped, F12 is also skipped. 204 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 205 static constexpr bool kAlignPairRegister = false; 206 static constexpr bool kQuickSoftFloatAbi = false; 207 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 208 static constexpr bool kQuickSkipOddFpRegisters = false; 209 static constexpr size_t kNumQuickGprArgs = 7; // 7 arguments passed in GPRs. 210 static constexpr size_t kNumQuickFprArgs = 7; // 7 arguments passed in FPRs. 211 static constexpr bool kGprFprLockstep = true; 212 213 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 24; // Offset of first FPR arg (F13). 214 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 80; // Offset of first GPR arg (A1). 215 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 200; // Offset of return address. 216 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 217 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 218 } 219 #elif defined(__i386__) 220 // The callee save frame is pointed to by SP. 221 // | argN | | 222 // | ... | | 223 // | arg4 | | 224 // | arg3 spill | | Caller's frame 225 // | arg2 spill | | 226 // | arg1 spill | | 227 // | Method* | --- 228 // | Return | 229 // | EBP,ESI,EDI | callee saves 230 // | EBX | arg3 231 // | EDX | arg2 232 // | ECX | arg1 233 // | XMM3 | float arg 4 234 // | XMM2 | float arg 3 235 // | XMM1 | float arg 2 236 // | XMM0 | float arg 1 237 // | EAX/Method* | <- sp 238 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 239 static constexpr bool kAlignPairRegister = false; 240 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 241 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 242 static constexpr bool kQuickSkipOddFpRegisters = false; 243 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 244 static constexpr size_t kNumQuickFprArgs = 4; // 4 arguments passed in FPRs. 245 static constexpr bool kGprFprLockstep = false; 246 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 4; // Offset of first FPR arg. 247 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4 + 4*8; // Offset of first GPR arg. 248 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 28 + 4*8; // Offset of return address. 249 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 250 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 251 } 252 #elif defined(__x86_64__) 253 // The callee save frame is pointed to by SP. 254 // | argN | | 255 // | ... | | 256 // | reg. arg spills | | Caller's frame 257 // | Method* | --- 258 // | Return | 259 // | R15 | callee save 260 // | R14 | callee save 261 // | R13 | callee save 262 // | R12 | callee save 263 // | R9 | arg5 264 // | R8 | arg4 265 // | RSI/R6 | arg1 266 // | RBP/R5 | callee save 267 // | RBX/R3 | callee save 268 // | RDX/R2 | arg2 269 // | RCX/R1 | arg3 270 // | XMM7 | float arg 8 271 // | XMM6 | float arg 7 272 // | XMM5 | float arg 6 273 // | XMM4 | float arg 5 274 // | XMM3 | float arg 4 275 // | XMM2 | float arg 3 276 // | XMM1 | float arg 2 277 // | XMM0 | float arg 1 278 // | Padding | 279 // | RDI/Method* | <- sp 280 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 281 static constexpr bool kAlignPairRegister = false; 282 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 283 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 284 static constexpr bool kQuickSkipOddFpRegisters = false; 285 static constexpr size_t kNumQuickGprArgs = 5; // 5 arguments passed in GPRs. 286 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 287 static constexpr bool kGprFprLockstep = false; 288 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 16; // Offset of first FPR arg. 289 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 80 + 4*8; // Offset of first GPR arg. 290 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 168 + 4*8; // Offset of return address. 291 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 292 switch (gpr_index) { 293 case 0: return (4 * GetBytesPerGprSpillLocation(kRuntimeISA)); 294 case 1: return (1 * GetBytesPerGprSpillLocation(kRuntimeISA)); 295 case 2: return (0 * GetBytesPerGprSpillLocation(kRuntimeISA)); 296 case 3: return (5 * GetBytesPerGprSpillLocation(kRuntimeISA)); 297 case 4: return (6 * GetBytesPerGprSpillLocation(kRuntimeISA)); 298 default: 299 LOG(FATAL) << "Unexpected GPR index: " << gpr_index; 300 return 0; 301 } 302 } 303 #else 304 #error "Unsupported architecture" 305 #endif 306 307 public: 308 // Special handling for proxy methods. Proxy methods are instance methods so the 309 // 'this' object is the 1st argument. They also have the same frame layout as the 310 // kRefAndArgs runtime method. Since 'this' is a reference, it is located in the 311 // 1st GPR. 312 static mirror::Object* GetProxyThisObject(ArtMethod** sp) 313 REQUIRES_SHARED(Locks::mutator_lock_) { 314 CHECK((*sp)->IsProxyMethod()); 315 CHECK_GT(kNumQuickGprArgs, 0u); 316 constexpr uint32_t kThisGprIndex = 0u; // 'this' is in the 1st GPR. 317 size_t this_arg_offset = kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset + 318 GprIndexToGprOffset(kThisGprIndex); 319 uint8_t* this_arg_address = reinterpret_cast<uint8_t*>(sp) + this_arg_offset; 320 return reinterpret_cast<StackReference<mirror::Object>*>(this_arg_address)->AsMirrorPtr(); 321 } 322 323 static ArtMethod* GetCallingMethod(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 324 DCHECK((*sp)->IsCalleeSaveMethod()); 325 return GetCalleeSaveMethodCaller(sp, Runtime::kSaveRefsAndArgs); 326 } 327 328 static ArtMethod* GetOuterMethod(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 329 DCHECK((*sp)->IsCalleeSaveMethod()); 330 uint8_t* previous_sp = 331 reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize; 332 return *reinterpret_cast<ArtMethod**>(previous_sp); 333 } 334 335 static uint32_t GetCallingDexPc(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 336 DCHECK((*sp)->IsCalleeSaveMethod()); 337 const size_t callee_frame_size = GetCalleeSaveFrameSize(kRuntimeISA, Runtime::kSaveRefsAndArgs); 338 ArtMethod** caller_sp = reinterpret_cast<ArtMethod**>( 339 reinterpret_cast<uintptr_t>(sp) + callee_frame_size); 340 uintptr_t outer_pc = QuickArgumentVisitor::GetCallingPc(sp); 341 const OatQuickMethodHeader* current_code = (*caller_sp)->GetOatQuickMethodHeader(outer_pc); 342 uintptr_t outer_pc_offset = current_code->NativeQuickPcOffset(outer_pc); 343 344 if (current_code->IsOptimized()) { 345 CodeInfo code_info = current_code->GetOptimizedCodeInfo(); 346 CodeInfoEncoding encoding = code_info.ExtractEncoding(); 347 StackMap stack_map = code_info.GetStackMapForNativePcOffset(outer_pc_offset, encoding); 348 DCHECK(stack_map.IsValid()); 349 if (stack_map.HasInlineInfo(encoding.stack_map.encoding)) { 350 InlineInfo inline_info = code_info.GetInlineInfoOf(stack_map, encoding); 351 return inline_info.GetDexPcAtDepth(encoding.inline_info.encoding, 352 inline_info.GetDepth(encoding.inline_info.encoding)-1); 353 } else { 354 return stack_map.GetDexPc(encoding.stack_map.encoding); 355 } 356 } else { 357 return current_code->ToDexPc(*caller_sp, outer_pc); 358 } 359 } 360 361 static bool GetInvokeType(ArtMethod** sp, InvokeType* invoke_type, uint32_t* dex_method_index) 362 REQUIRES_SHARED(Locks::mutator_lock_) { 363 DCHECK((*sp)->IsCalleeSaveMethod()); 364 const size_t callee_frame_size = GetCalleeSaveFrameSize(kRuntimeISA, Runtime::kSaveRefsAndArgs); 365 ArtMethod** caller_sp = reinterpret_cast<ArtMethod**>( 366 reinterpret_cast<uintptr_t>(sp) + callee_frame_size); 367 uintptr_t outer_pc = QuickArgumentVisitor::GetCallingPc(sp); 368 const OatQuickMethodHeader* current_code = (*caller_sp)->GetOatQuickMethodHeader(outer_pc); 369 if (!current_code->IsOptimized()) { 370 return false; 371 } 372 uintptr_t outer_pc_offset = current_code->NativeQuickPcOffset(outer_pc); 373 CodeInfo code_info = current_code->GetOptimizedCodeInfo(); 374 CodeInfoEncoding encoding = code_info.ExtractEncoding(); 375 MethodInfo method_info = current_code->GetOptimizedMethodInfo(); 376 InvokeInfo invoke(code_info.GetInvokeInfoForNativePcOffset(outer_pc_offset, encoding)); 377 if (invoke.IsValid()) { 378 *invoke_type = static_cast<InvokeType>(invoke.GetInvokeType(encoding.invoke_info.encoding)); 379 *dex_method_index = invoke.GetMethodIndex(encoding.invoke_info.encoding, method_info); 380 return true; 381 } 382 return false; 383 } 384 385 // For the given quick ref and args quick frame, return the caller's PC. 386 static uintptr_t GetCallingPc(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 387 DCHECK((*sp)->IsCalleeSaveMethod()); 388 uint8_t* lr = reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_LrOffset; 389 return *reinterpret_cast<uintptr_t*>(lr); 390 } 391 392 QuickArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, 393 uint32_t shorty_len) REQUIRES_SHARED(Locks::mutator_lock_) : 394 is_static_(is_static), shorty_(shorty), shorty_len_(shorty_len), 395 gpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset), 396 fpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset), 397 stack_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize 398 + sizeof(ArtMethod*)), // Skip ArtMethod*. 399 gpr_index_(0), fpr_index_(0), fpr_double_index_(0), stack_index_(0), 400 cur_type_(Primitive::kPrimVoid), is_split_long_or_double_(false) { 401 static_assert(kQuickSoftFloatAbi == (kNumQuickFprArgs == 0), 402 "Number of Quick FPR arguments unexpected"); 403 static_assert(!(kQuickSoftFloatAbi && kQuickDoubleRegAlignedFloatBackFilled), 404 "Double alignment unexpected"); 405 // For register alignment, we want to assume that counters(fpr_double_index_) are even if the 406 // next register is even. 407 static_assert(!kQuickDoubleRegAlignedFloatBackFilled || kNumQuickFprArgs % 2 == 0, 408 "Number of Quick FPR arguments not even"); 409 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 410 } 411 412 virtual ~QuickArgumentVisitor() {} 413 414 virtual void Visit() = 0; 415 416 Primitive::Type GetParamPrimitiveType() const { 417 return cur_type_; 418 } 419 420 uint8_t* GetParamAddress() const { 421 if (!kQuickSoftFloatAbi) { 422 Primitive::Type type = GetParamPrimitiveType(); 423 if (UNLIKELY((type == Primitive::kPrimDouble) || (type == Primitive::kPrimFloat))) { 424 if (type == Primitive::kPrimDouble && kQuickDoubleRegAlignedFloatBackFilled) { 425 if (fpr_double_index_ + 2 < kNumQuickFprArgs + 1) { 426 return fpr_args_ + (fpr_double_index_ * GetBytesPerFprSpillLocation(kRuntimeISA)); 427 } 428 } else if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 429 return fpr_args_ + (fpr_index_ * GetBytesPerFprSpillLocation(kRuntimeISA)); 430 } 431 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 432 } 433 } 434 if (gpr_index_ < kNumQuickGprArgs) { 435 return gpr_args_ + GprIndexToGprOffset(gpr_index_); 436 } 437 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 438 } 439 440 bool IsSplitLongOrDouble() const { 441 if ((GetBytesPerGprSpillLocation(kRuntimeISA) == 4) || 442 (GetBytesPerFprSpillLocation(kRuntimeISA) == 4)) { 443 return is_split_long_or_double_; 444 } else { 445 return false; // An optimization for when GPR and FPRs are 64bit. 446 } 447 } 448 449 bool IsParamAReference() const { 450 return GetParamPrimitiveType() == Primitive::kPrimNot; 451 } 452 453 bool IsParamALongOrDouble() const { 454 Primitive::Type type = GetParamPrimitiveType(); 455 return type == Primitive::kPrimLong || type == Primitive::kPrimDouble; 456 } 457 458 uint64_t ReadSplitLongParam() const { 459 // The splitted long is always available through the stack. 460 return *reinterpret_cast<uint64_t*>(stack_args_ 461 + stack_index_ * kBytesStackArgLocation); 462 } 463 464 void IncGprIndex() { 465 gpr_index_++; 466 if (kGprFprLockstep) { 467 fpr_index_++; 468 } 469 } 470 471 void IncFprIndex() { 472 fpr_index_++; 473 if (kGprFprLockstep) { 474 gpr_index_++; 475 } 476 } 477 478 void VisitArguments() REQUIRES_SHARED(Locks::mutator_lock_) { 479 // (a) 'stack_args_' should point to the first method's argument 480 // (b) whatever the argument type it is, the 'stack_index_' should 481 // be moved forward along with every visiting. 482 gpr_index_ = 0; 483 fpr_index_ = 0; 484 if (kQuickDoubleRegAlignedFloatBackFilled) { 485 fpr_double_index_ = 0; 486 } 487 stack_index_ = 0; 488 if (!is_static_) { // Handle this. 489 cur_type_ = Primitive::kPrimNot; 490 is_split_long_or_double_ = false; 491 Visit(); 492 stack_index_++; 493 if (kNumQuickGprArgs > 0) { 494 IncGprIndex(); 495 } 496 } 497 for (uint32_t shorty_index = 1; shorty_index < shorty_len_; ++shorty_index) { 498 cur_type_ = Primitive::GetType(shorty_[shorty_index]); 499 switch (cur_type_) { 500 case Primitive::kPrimNot: 501 case Primitive::kPrimBoolean: 502 case Primitive::kPrimByte: 503 case Primitive::kPrimChar: 504 case Primitive::kPrimShort: 505 case Primitive::kPrimInt: 506 is_split_long_or_double_ = false; 507 Visit(); 508 stack_index_++; 509 if (gpr_index_ < kNumQuickGprArgs) { 510 IncGprIndex(); 511 } 512 break; 513 case Primitive::kPrimFloat: 514 is_split_long_or_double_ = false; 515 Visit(); 516 stack_index_++; 517 if (kQuickSoftFloatAbi) { 518 if (gpr_index_ < kNumQuickGprArgs) { 519 IncGprIndex(); 520 } 521 } else { 522 if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 523 IncFprIndex(); 524 if (kQuickDoubleRegAlignedFloatBackFilled) { 525 // Double should not overlap with float. 526 // For example, if fpr_index_ = 3, fpr_double_index_ should be at least 4. 527 fpr_double_index_ = std::max(fpr_double_index_, RoundUp(fpr_index_, 2)); 528 // Float should not overlap with double. 529 if (fpr_index_ % 2 == 0) { 530 fpr_index_ = std::max(fpr_double_index_, fpr_index_); 531 } 532 } else if (kQuickSkipOddFpRegisters) { 533 IncFprIndex(); 534 } 535 } 536 } 537 break; 538 case Primitive::kPrimDouble: 539 case Primitive::kPrimLong: 540 if (kQuickSoftFloatAbi || (cur_type_ == Primitive::kPrimLong)) { 541 if (cur_type_ == Primitive::kPrimLong && 542 #if defined(__mips__) && !defined(__LP64__) 543 (gpr_index_ == 0 || gpr_index_ == 2) && 544 #else 545 gpr_index_ == 0 && 546 #endif 547 kAlignPairRegister) { 548 // Currently, this is only for ARM and MIPS, where we align long parameters with 549 // even-numbered registers by skipping R1 (on ARM) or A1(A3) (on MIPS) and using 550 // R2 (on ARM) or A2(T0) (on MIPS) instead. 551 IncGprIndex(); 552 } 553 is_split_long_or_double_ = (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) && 554 ((gpr_index_ + 1) == kNumQuickGprArgs); 555 if (!kSplitPairAcrossRegisterAndStack && is_split_long_or_double_) { 556 // We don't want to split this. Pass over this register. 557 gpr_index_++; 558 is_split_long_or_double_ = false; 559 } 560 Visit(); 561 if (kBytesStackArgLocation == 4) { 562 stack_index_+= 2; 563 } else { 564 CHECK_EQ(kBytesStackArgLocation, 8U); 565 stack_index_++; 566 } 567 if (gpr_index_ < kNumQuickGprArgs) { 568 IncGprIndex(); 569 if (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) { 570 if (gpr_index_ < kNumQuickGprArgs) { 571 IncGprIndex(); 572 } 573 } 574 } 575 } else { 576 is_split_long_or_double_ = (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) && 577 ((fpr_index_ + 1) == kNumQuickFprArgs) && !kQuickDoubleRegAlignedFloatBackFilled; 578 Visit(); 579 if (kBytesStackArgLocation == 4) { 580 stack_index_+= 2; 581 } else { 582 CHECK_EQ(kBytesStackArgLocation, 8U); 583 stack_index_++; 584 } 585 if (kQuickDoubleRegAlignedFloatBackFilled) { 586 if (fpr_double_index_ + 2 < kNumQuickFprArgs + 1) { 587 fpr_double_index_ += 2; 588 // Float should not overlap with double. 589 if (fpr_index_ % 2 == 0) { 590 fpr_index_ = std::max(fpr_double_index_, fpr_index_); 591 } 592 } 593 } else if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 594 IncFprIndex(); 595 if (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) { 596 if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 597 IncFprIndex(); 598 } 599 } 600 } 601 } 602 break; 603 default: 604 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty_; 605 } 606 } 607 } 608 609 protected: 610 const bool is_static_; 611 const char* const shorty_; 612 const uint32_t shorty_len_; 613 614 private: 615 uint8_t* const gpr_args_; // Address of GPR arguments in callee save frame. 616 uint8_t* const fpr_args_; // Address of FPR arguments in callee save frame. 617 uint8_t* const stack_args_; // Address of stack arguments in caller's frame. 618 uint32_t gpr_index_; // Index into spilled GPRs. 619 // Index into spilled FPRs. 620 // In case kQuickDoubleRegAlignedFloatBackFilled, it may index a hole while fpr_double_index_ 621 // holds a higher register number. 622 uint32_t fpr_index_; 623 // Index into spilled FPRs for aligned double. 624 // Only used when kQuickDoubleRegAlignedFloatBackFilled. Next available double register indexed in 625 // terms of singles, may be behind fpr_index. 626 uint32_t fpr_double_index_; 627 uint32_t stack_index_; // Index into arguments on the stack. 628 // The current type of argument during VisitArguments. 629 Primitive::Type cur_type_; 630 // Does a 64bit parameter straddle the register and stack arguments? 631 bool is_split_long_or_double_; 632 }; 633 634 // Returns the 'this' object of a proxy method. This function is only used by StackVisitor. It 635 // allows to use the QuickArgumentVisitor constants without moving all the code in its own module. 636 extern "C" mirror::Object* artQuickGetProxyThisObject(ArtMethod** sp) 637 REQUIRES_SHARED(Locks::mutator_lock_) { 638 return QuickArgumentVisitor::GetProxyThisObject(sp); 639 } 640 641 // Visits arguments on the stack placing them into the shadow frame. 642 class BuildQuickShadowFrameVisitor FINAL : public QuickArgumentVisitor { 643 public: 644 BuildQuickShadowFrameVisitor(ArtMethod** sp, bool is_static, const char* shorty, 645 uint32_t shorty_len, ShadowFrame* sf, size_t first_arg_reg) : 646 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), sf_(sf), cur_reg_(first_arg_reg) {} 647 648 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 649 650 private: 651 ShadowFrame* const sf_; 652 uint32_t cur_reg_; 653 654 DISALLOW_COPY_AND_ASSIGN(BuildQuickShadowFrameVisitor); 655 }; 656 657 void BuildQuickShadowFrameVisitor::Visit() { 658 Primitive::Type type = GetParamPrimitiveType(); 659 switch (type) { 660 case Primitive::kPrimLong: // Fall-through. 661 case Primitive::kPrimDouble: 662 if (IsSplitLongOrDouble()) { 663 sf_->SetVRegLong(cur_reg_, ReadSplitLongParam()); 664 } else { 665 sf_->SetVRegLong(cur_reg_, *reinterpret_cast<jlong*>(GetParamAddress())); 666 } 667 ++cur_reg_; 668 break; 669 case Primitive::kPrimNot: { 670 StackReference<mirror::Object>* stack_ref = 671 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 672 sf_->SetVRegReference(cur_reg_, stack_ref->AsMirrorPtr()); 673 } 674 break; 675 case Primitive::kPrimBoolean: // Fall-through. 676 case Primitive::kPrimByte: // Fall-through. 677 case Primitive::kPrimChar: // Fall-through. 678 case Primitive::kPrimShort: // Fall-through. 679 case Primitive::kPrimInt: // Fall-through. 680 case Primitive::kPrimFloat: 681 sf_->SetVReg(cur_reg_, *reinterpret_cast<jint*>(GetParamAddress())); 682 break; 683 case Primitive::kPrimVoid: 684 LOG(FATAL) << "UNREACHABLE"; 685 UNREACHABLE(); 686 } 687 ++cur_reg_; 688 } 689 690 extern "C" uint64_t artQuickToInterpreterBridge(ArtMethod* method, Thread* self, ArtMethod** sp) 691 REQUIRES_SHARED(Locks::mutator_lock_) { 692 // Ensure we don't get thread suspension until the object arguments are safely in the shadow 693 // frame. 694 ScopedQuickEntrypointChecks sqec(self); 695 696 if (UNLIKELY(!method->IsInvokable())) { 697 method->ThrowInvocationTimeError(); 698 return 0; 699 } 700 701 JValue tmp_value; 702 ShadowFrame* deopt_frame = self->PopStackedShadowFrame( 703 StackedShadowFrameType::kDeoptimizationShadowFrame, false); 704 ManagedStack fragment; 705 706 DCHECK(!method->IsNative()) << method->PrettyMethod(); 707 uint32_t shorty_len = 0; 708 ArtMethod* non_proxy_method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize); 709 const DexFile::CodeItem* code_item = non_proxy_method->GetCodeItem(); 710 DCHECK(code_item != nullptr) << method->PrettyMethod(); 711 const char* shorty = non_proxy_method->GetShorty(&shorty_len); 712 713 JValue result; 714 715 if (deopt_frame != nullptr) { 716 // Coming from partial-fragment deopt. 717 718 if (kIsDebugBuild) { 719 // Sanity-check: are the methods as expected? We check that the last shadow frame (the bottom 720 // of the call-stack) corresponds to the called method. 721 ShadowFrame* linked = deopt_frame; 722 while (linked->GetLink() != nullptr) { 723 linked = linked->GetLink(); 724 } 725 CHECK_EQ(method, linked->GetMethod()) << method->PrettyMethod() << " " 726 << ArtMethod::PrettyMethod(linked->GetMethod()); 727 } 728 729 if (VLOG_IS_ON(deopt)) { 730 // Print out the stack to verify that it was a partial-fragment deopt. 731 LOG(INFO) << "Continue-ing from deopt. Stack is:"; 732 QuickExceptionHandler::DumpFramesWithType(self, true); 733 } 734 735 ObjPtr<mirror::Throwable> pending_exception; 736 bool from_code = false; 737 self->PopDeoptimizationContext(&result, &pending_exception, /* out */ &from_code); 738 739 // Push a transition back into managed code onto the linked list in thread. 740 self->PushManagedStackFragment(&fragment); 741 742 // Ensure that the stack is still in order. 743 if (kIsDebugBuild) { 744 class DummyStackVisitor : public StackVisitor { 745 public: 746 explicit DummyStackVisitor(Thread* self_in) REQUIRES_SHARED(Locks::mutator_lock_) 747 : StackVisitor(self_in, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {} 748 749 bool VisitFrame() OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) { 750 // Nothing to do here. In a debug build, SanityCheckFrame will do the work in the walking 751 // logic. Just always say we want to continue. 752 return true; 753 } 754 }; 755 DummyStackVisitor dsv(self); 756 dsv.WalkStack(); 757 } 758 759 // Restore the exception that was pending before deoptimization then interpret the 760 // deoptimized frames. 761 if (pending_exception != nullptr) { 762 self->SetException(pending_exception); 763 } 764 interpreter::EnterInterpreterFromDeoptimize(self, deopt_frame, from_code, &result); 765 } else { 766 const char* old_cause = self->StartAssertNoThreadSuspension( 767 "Building interpreter shadow frame"); 768 uint16_t num_regs = code_item->registers_size_; 769 // No last shadow coming from quick. 770 ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = 771 CREATE_SHADOW_FRAME(num_regs, /* link */ nullptr, method, /* dex pc */ 0); 772 ShadowFrame* shadow_frame = shadow_frame_unique_ptr.get(); 773 size_t first_arg_reg = code_item->registers_size_ - code_item->ins_size_; 774 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, method->IsStatic(), shorty, shorty_len, 775 shadow_frame, first_arg_reg); 776 shadow_frame_builder.VisitArguments(); 777 const bool needs_initialization = 778 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 779 // Push a transition back into managed code onto the linked list in thread. 780 self->PushManagedStackFragment(&fragment); 781 self->PushShadowFrame(shadow_frame); 782 self->EndAssertNoThreadSuspension(old_cause); 783 784 if (needs_initialization) { 785 // Ensure static method's class is initialized. 786 StackHandleScope<1> hs(self); 787 Handle<mirror::Class> h_class(hs.NewHandle(shadow_frame->GetMethod()->GetDeclaringClass())); 788 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) { 789 DCHECK(Thread::Current()->IsExceptionPending()) 790 << shadow_frame->GetMethod()->PrettyMethod(); 791 self->PopManagedStackFragment(fragment); 792 return 0; 793 } 794 } 795 796 result = interpreter::EnterInterpreterFromEntryPoint(self, code_item, shadow_frame); 797 } 798 799 // Pop transition. 800 self->PopManagedStackFragment(fragment); 801 802 // Request a stack deoptimization if needed 803 ArtMethod* caller = QuickArgumentVisitor::GetCallingMethod(sp); 804 uintptr_t caller_pc = QuickArgumentVisitor::GetCallingPc(sp); 805 // If caller_pc is the instrumentation exit stub, the stub will check to see if deoptimization 806 // should be done and it knows the real return pc. 807 if (UNLIKELY(caller_pc != reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc()) && 808 Dbg::IsForcedInterpreterNeededForUpcall(self, caller))) { 809 if (!Runtime::Current()->IsAsyncDeoptimizeable(caller_pc)) { 810 LOG(WARNING) << "Got a deoptimization request on un-deoptimizable method " 811 << caller->PrettyMethod(); 812 } else { 813 // Push the context of the deoptimization stack so we can restore the return value and the 814 // exception before executing the deoptimized frames. 815 self->PushDeoptimizationContext( 816 result, shorty[0] == 'L', /* from_code */ false, self->GetException()); 817 818 // Set special exception to cause deoptimization. 819 self->SetException(Thread::GetDeoptimizationException()); 820 } 821 } 822 823 // No need to restore the args since the method has already been run by the interpreter. 824 return result.GetJ(); 825 } 826 827 // Visits arguments on the stack placing them into the args vector, Object* arguments are converted 828 // to jobjects. 829 class BuildQuickArgumentVisitor FINAL : public QuickArgumentVisitor { 830 public: 831 BuildQuickArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, uint32_t shorty_len, 832 ScopedObjectAccessUnchecked* soa, std::vector<jvalue>* args) : 833 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa), args_(args) {} 834 835 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 836 837 void FixupReferences() REQUIRES_SHARED(Locks::mutator_lock_); 838 839 private: 840 ScopedObjectAccessUnchecked* const soa_; 841 std::vector<jvalue>* const args_; 842 // References which we must update when exiting in case the GC moved the objects. 843 std::vector<std::pair<jobject, StackReference<mirror::Object>*>> references_; 844 845 DISALLOW_COPY_AND_ASSIGN(BuildQuickArgumentVisitor); 846 }; 847 848 void BuildQuickArgumentVisitor::Visit() { 849 jvalue val; 850 Primitive::Type type = GetParamPrimitiveType(); 851 switch (type) { 852 case Primitive::kPrimNot: { 853 StackReference<mirror::Object>* stack_ref = 854 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 855 val.l = soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 856 references_.push_back(std::make_pair(val.l, stack_ref)); 857 break; 858 } 859 case Primitive::kPrimLong: // Fall-through. 860 case Primitive::kPrimDouble: 861 if (IsSplitLongOrDouble()) { 862 val.j = ReadSplitLongParam(); 863 } else { 864 val.j = *reinterpret_cast<jlong*>(GetParamAddress()); 865 } 866 break; 867 case Primitive::kPrimBoolean: // Fall-through. 868 case Primitive::kPrimByte: // Fall-through. 869 case Primitive::kPrimChar: // Fall-through. 870 case Primitive::kPrimShort: // Fall-through. 871 case Primitive::kPrimInt: // Fall-through. 872 case Primitive::kPrimFloat: 873 val.i = *reinterpret_cast<jint*>(GetParamAddress()); 874 break; 875 case Primitive::kPrimVoid: 876 LOG(FATAL) << "UNREACHABLE"; 877 UNREACHABLE(); 878 } 879 args_->push_back(val); 880 } 881 882 void BuildQuickArgumentVisitor::FixupReferences() { 883 // Fixup any references which may have changed. 884 for (const auto& pair : references_) { 885 pair.second->Assign(soa_->Decode<mirror::Object>(pair.first)); 886 soa_->Env()->DeleteLocalRef(pair.first); 887 } 888 } 889 890 // Handler for invocation on proxy methods. On entry a frame will exist for the proxy object method 891 // which is responsible for recording callee save registers. We explicitly place into jobjects the 892 // incoming reference arguments (so they survive GC). We invoke the invocation handler, which is a 893 // field within the proxy object, which will box the primitive arguments and deal with error cases. 894 extern "C" uint64_t artQuickProxyInvokeHandler( 895 ArtMethod* proxy_method, mirror::Object* receiver, Thread* self, ArtMethod** sp) 896 REQUIRES_SHARED(Locks::mutator_lock_) { 897 DCHECK(proxy_method->IsProxyMethod()) << proxy_method->PrettyMethod(); 898 DCHECK(receiver->GetClass()->IsProxyClass()) << proxy_method->PrettyMethod(); 899 // Ensure we don't get thread suspension until the object arguments are safely in jobjects. 900 const char* old_cause = 901 self->StartAssertNoThreadSuspension("Adding to IRT proxy object arguments"); 902 // Register the top of the managed stack, making stack crawlable. 903 DCHECK_EQ((*sp), proxy_method) << proxy_method->PrettyMethod(); 904 self->VerifyStack(); 905 // Start new JNI local reference state. 906 JNIEnvExt* env = self->GetJniEnv(); 907 ScopedObjectAccessUnchecked soa(env); 908 ScopedJniEnvLocalRefState env_state(env); 909 // Create local ref. copies of proxy method and the receiver. 910 jobject rcvr_jobj = soa.AddLocalReference<jobject>(receiver); 911 912 // Placing arguments into args vector and remove the receiver. 913 ArtMethod* non_proxy_method = proxy_method->GetInterfaceMethodIfProxy(kRuntimePointerSize); 914 CHECK(!non_proxy_method->IsStatic()) << proxy_method->PrettyMethod() << " " 915 << non_proxy_method->PrettyMethod(); 916 std::vector<jvalue> args; 917 uint32_t shorty_len = 0; 918 const char* shorty = non_proxy_method->GetShorty(&shorty_len); 919 BuildQuickArgumentVisitor local_ref_visitor(sp, false, shorty, shorty_len, &soa, &args); 920 921 local_ref_visitor.VisitArguments(); 922 DCHECK_GT(args.size(), 0U) << proxy_method->PrettyMethod(); 923 args.erase(args.begin()); 924 925 // Convert proxy method into expected interface method. 926 ArtMethod* interface_method = proxy_method->FindOverriddenMethod(kRuntimePointerSize); 927 DCHECK(interface_method != nullptr) << proxy_method->PrettyMethod(); 928 DCHECK(!interface_method->IsProxyMethod()) << interface_method->PrettyMethod(); 929 self->EndAssertNoThreadSuspension(old_cause); 930 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 931 DCHECK(!Runtime::Current()->IsActiveTransaction()); 932 jobject interface_method_jobj = soa.AddLocalReference<jobject>( 933 mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), 934 interface_method)); 935 936 // All naked Object*s should now be in jobjects, so its safe to go into the main invoke code 937 // that performs allocations. 938 JValue result = InvokeProxyInvocationHandler(soa, shorty, rcvr_jobj, interface_method_jobj, args); 939 // Restore references which might have moved. 940 local_ref_visitor.FixupReferences(); 941 return result.GetJ(); 942 } 943 944 // Read object references held in arguments from quick frames and place in a JNI local references, 945 // so they don't get garbage collected. 946 class RememberForGcArgumentVisitor FINAL : public QuickArgumentVisitor { 947 public: 948 RememberForGcArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, 949 uint32_t shorty_len, ScopedObjectAccessUnchecked* soa) : 950 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa) {} 951 952 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 953 954 void FixupReferences() REQUIRES_SHARED(Locks::mutator_lock_); 955 956 private: 957 ScopedObjectAccessUnchecked* const soa_; 958 // References which we must update when exiting in case the GC moved the objects. 959 std::vector<std::pair<jobject, StackReference<mirror::Object>*> > references_; 960 961 DISALLOW_COPY_AND_ASSIGN(RememberForGcArgumentVisitor); 962 }; 963 964 void RememberForGcArgumentVisitor::Visit() { 965 if (IsParamAReference()) { 966 StackReference<mirror::Object>* stack_ref = 967 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 968 jobject reference = 969 soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 970 references_.push_back(std::make_pair(reference, stack_ref)); 971 } 972 } 973 974 void RememberForGcArgumentVisitor::FixupReferences() { 975 // Fixup any references which may have changed. 976 for (const auto& pair : references_) { 977 pair.second->Assign(soa_->Decode<mirror::Object>(pair.first)); 978 soa_->Env()->DeleteLocalRef(pair.first); 979 } 980 } 981 982 // Lazily resolve a method for quick. Called by stub code. 983 extern "C" const void* artQuickResolutionTrampoline( 984 ArtMethod* called, mirror::Object* receiver, Thread* self, ArtMethod** sp) 985 REQUIRES_SHARED(Locks::mutator_lock_) { 986 // The resolution trampoline stashes the resolved method into the callee-save frame to transport 987 // it. Thus, when exiting, the stack cannot be verified (as the resolved method most likely 988 // does not have the same stack layout as the callee-save method). 989 ScopedQuickEntrypointChecks sqec(self, kIsDebugBuild, false); 990 // Start new JNI local reference state 991 JNIEnvExt* env = self->GetJniEnv(); 992 ScopedObjectAccessUnchecked soa(env); 993 ScopedJniEnvLocalRefState env_state(env); 994 const char* old_cause = self->StartAssertNoThreadSuspension("Quick method resolution set up"); 995 996 // Compute details about the called method (avoid GCs) 997 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 998 InvokeType invoke_type; 999 MethodReference called_method(nullptr, 0); 1000 const bool called_method_known_on_entry = !called->IsRuntimeMethod(); 1001 ArtMethod* caller = nullptr; 1002 if (!called_method_known_on_entry) { 1003 caller = QuickArgumentVisitor::GetCallingMethod(sp); 1004 called_method.dex_file = caller->GetDexFile(); 1005 1006 InvokeType stack_map_invoke_type; 1007 uint32_t stack_map_dex_method_idx; 1008 const bool found_stack_map = QuickArgumentVisitor::GetInvokeType(sp, 1009 &stack_map_invoke_type, 1010 &stack_map_dex_method_idx); 1011 // For debug builds, we make sure both of the paths are consistent by also looking at the dex 1012 // code. 1013 if (!found_stack_map || kIsDebugBuild) { 1014 uint32_t dex_pc = QuickArgumentVisitor::GetCallingDexPc(sp); 1015 const DexFile::CodeItem* code; 1016 code = caller->GetCodeItem(); 1017 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 1018 const Instruction* instr = Instruction::At(&code->insns_[dex_pc]); 1019 Instruction::Code instr_code = instr->Opcode(); 1020 bool is_range; 1021 switch (instr_code) { 1022 case Instruction::INVOKE_DIRECT: 1023 invoke_type = kDirect; 1024 is_range = false; 1025 break; 1026 case Instruction::INVOKE_DIRECT_RANGE: 1027 invoke_type = kDirect; 1028 is_range = true; 1029 break; 1030 case Instruction::INVOKE_STATIC: 1031 invoke_type = kStatic; 1032 is_range = false; 1033 break; 1034 case Instruction::INVOKE_STATIC_RANGE: 1035 invoke_type = kStatic; 1036 is_range = true; 1037 break; 1038 case Instruction::INVOKE_SUPER: 1039 invoke_type = kSuper; 1040 is_range = false; 1041 break; 1042 case Instruction::INVOKE_SUPER_RANGE: 1043 invoke_type = kSuper; 1044 is_range = true; 1045 break; 1046 case Instruction::INVOKE_VIRTUAL: 1047 invoke_type = kVirtual; 1048 is_range = false; 1049 break; 1050 case Instruction::INVOKE_VIRTUAL_RANGE: 1051 invoke_type = kVirtual; 1052 is_range = true; 1053 break; 1054 case Instruction::INVOKE_INTERFACE: 1055 invoke_type = kInterface; 1056 is_range = false; 1057 break; 1058 case Instruction::INVOKE_INTERFACE_RANGE: 1059 invoke_type = kInterface; 1060 is_range = true; 1061 break; 1062 default: 1063 LOG(FATAL) << "Unexpected call into trampoline: " << instr->DumpString(nullptr); 1064 UNREACHABLE(); 1065 } 1066 called_method.dex_method_index = (is_range) ? instr->VRegB_3rc() : instr->VRegB_35c(); 1067 // Check that the invoke matches what we expected, note that this path only happens for debug 1068 // builds. 1069 if (found_stack_map) { 1070 DCHECK_EQ(stack_map_invoke_type, invoke_type); 1071 if (invoke_type != kSuper) { 1072 // Super may be sharpened. 1073 DCHECK_EQ(stack_map_dex_method_idx, called_method.dex_method_index) 1074 << called_method.dex_file->PrettyMethod(stack_map_dex_method_idx) << " " 1075 << called_method.dex_file->PrettyMethod(called_method.dex_method_index); 1076 } 1077 } else { 1078 VLOG(dex) << "Accessed dex file for invoke " << invoke_type << " " 1079 << called_method.dex_method_index; 1080 } 1081 } else { 1082 invoke_type = stack_map_invoke_type; 1083 called_method.dex_method_index = stack_map_dex_method_idx; 1084 } 1085 } else { 1086 invoke_type = kStatic; 1087 called_method.dex_file = called->GetDexFile(); 1088 called_method.dex_method_index = called->GetDexMethodIndex(); 1089 } 1090 uint32_t shorty_len; 1091 const char* shorty = 1092 called_method.dex_file->GetMethodShorty( 1093 called_method.dex_file->GetMethodId(called_method.dex_method_index), &shorty_len); 1094 RememberForGcArgumentVisitor visitor(sp, invoke_type == kStatic, shorty, shorty_len, &soa); 1095 visitor.VisitArguments(); 1096 self->EndAssertNoThreadSuspension(old_cause); 1097 const bool virtual_or_interface = invoke_type == kVirtual || invoke_type == kInterface; 1098 // Resolve method filling in dex cache. 1099 if (!called_method_known_on_entry) { 1100 StackHandleScope<1> hs(self); 1101 mirror::Object* dummy = nullptr; 1102 HandleWrapper<mirror::Object> h_receiver( 1103 hs.NewHandleWrapper(virtual_or_interface ? &receiver : &dummy)); 1104 DCHECK_EQ(caller->GetDexFile(), called_method.dex_file); 1105 called = linker->ResolveMethod<ClassLinker::kForceICCECheck>( 1106 self, called_method.dex_method_index, caller, invoke_type); 1107 } 1108 const void* code = nullptr; 1109 if (LIKELY(!self->IsExceptionPending())) { 1110 // Incompatible class change should have been handled in resolve method. 1111 CHECK(!called->CheckIncompatibleClassChange(invoke_type)) 1112 << called->PrettyMethod() << " " << invoke_type; 1113 if (virtual_or_interface || invoke_type == kSuper) { 1114 // Refine called method based on receiver for kVirtual/kInterface, and 1115 // caller for kSuper. 1116 ArtMethod* orig_called = called; 1117 if (invoke_type == kVirtual) { 1118 CHECK(receiver != nullptr) << invoke_type; 1119 called = receiver->GetClass()->FindVirtualMethodForVirtual(called, kRuntimePointerSize); 1120 } else if (invoke_type == kInterface) { 1121 CHECK(receiver != nullptr) << invoke_type; 1122 called = receiver->GetClass()->FindVirtualMethodForInterface(called, kRuntimePointerSize); 1123 } else { 1124 DCHECK_EQ(invoke_type, kSuper); 1125 CHECK(caller != nullptr) << invoke_type; 1126 StackHandleScope<2> hs(self); 1127 Handle<mirror::DexCache> dex_cache( 1128 hs.NewHandle(caller->GetDeclaringClass()->GetDexCache())); 1129 Handle<mirror::ClassLoader> class_loader( 1130 hs.NewHandle(caller->GetDeclaringClass()->GetClassLoader())); 1131 // TODO Maybe put this into a mirror::Class function. 1132 mirror::Class* ref_class = linker->ResolveReferencedClassOfMethod( 1133 called_method.dex_method_index, dex_cache, class_loader); 1134 if (ref_class->IsInterface()) { 1135 called = ref_class->FindVirtualMethodForInterfaceSuper(called, kRuntimePointerSize); 1136 } else { 1137 called = caller->GetDeclaringClass()->GetSuperClass()->GetVTableEntry( 1138 called->GetMethodIndex(), kRuntimePointerSize); 1139 } 1140 } 1141 1142 CHECK(called != nullptr) << orig_called->PrettyMethod() << " " 1143 << mirror::Object::PrettyTypeOf(receiver) << " " 1144 << invoke_type << " " << orig_called->GetVtableIndex(); 1145 1146 // We came here because of sharpening. Ensure the dex cache is up-to-date on the method index 1147 // of the sharpened method avoiding dirtying the dex cache if possible. 1148 // Note, called_method.dex_method_index references the dex method before the 1149 // FindVirtualMethodFor... This is ok for FindDexMethodIndexInOtherDexFile that only cares 1150 // about the name and signature. 1151 uint32_t update_dex_cache_method_index = called->GetDexMethodIndex(); 1152 if (!called->HasSameDexCacheResolvedMethods(caller, kRuntimePointerSize)) { 1153 // Calling from one dex file to another, need to compute the method index appropriate to 1154 // the caller's dex file. Since we get here only if the original called was a runtime 1155 // method, we've got the correct dex_file and a dex_method_idx from above. 1156 DCHECK(!called_method_known_on_entry); 1157 DCHECK_EQ(caller->GetDexFile(), called_method.dex_file); 1158 const DexFile* caller_dex_file = called_method.dex_file; 1159 uint32_t caller_method_name_and_sig_index = called_method.dex_method_index; 1160 update_dex_cache_method_index = 1161 called->FindDexMethodIndexInOtherDexFile(*caller_dex_file, 1162 caller_method_name_and_sig_index); 1163 } 1164 if ((update_dex_cache_method_index != DexFile::kDexNoIndex) && 1165 (caller->GetDexCacheResolvedMethod( 1166 update_dex_cache_method_index, kRuntimePointerSize) != called)) { 1167 caller->SetDexCacheResolvedMethod(update_dex_cache_method_index, 1168 called, 1169 kRuntimePointerSize); 1170 } 1171 } else if (invoke_type == kStatic) { 1172 const auto called_dex_method_idx = called->GetDexMethodIndex(); 1173 // For static invokes, we may dispatch to the static method in the superclass but resolve 1174 // using the subclass. To prevent getting slow paths on each invoke, we force set the 1175 // resolved method for the super class dex method index if we are in the same dex file. 1176 // b/19175856 1177 if (called->GetDexFile() == called_method.dex_file && 1178 called_method.dex_method_index != called_dex_method_idx) { 1179 called->GetDexCache()->SetResolvedMethod(called_dex_method_idx, 1180 called, 1181 kRuntimePointerSize); 1182 } 1183 } 1184 1185 // Ensure that the called method's class is initialized. 1186 StackHandleScope<1> hs(soa.Self()); 1187 Handle<mirror::Class> called_class(hs.NewHandle(called->GetDeclaringClass())); 1188 linker->EnsureInitialized(soa.Self(), called_class, true, true); 1189 if (LIKELY(called_class->IsInitialized())) { 1190 if (UNLIKELY(Dbg::IsForcedInterpreterNeededForResolution(self, called))) { 1191 // If we are single-stepping or the called method is deoptimized (by a 1192 // breakpoint, for example), then we have to execute the called method 1193 // with the interpreter. 1194 code = GetQuickToInterpreterBridge(); 1195 } else if (UNLIKELY(Dbg::IsForcedInstrumentationNeededForResolution(self, caller))) { 1196 // If the caller is deoptimized (by a breakpoint, for example), we have to 1197 // continue its execution with interpreter when returning from the called 1198 // method. Because we do not want to execute the called method with the 1199 // interpreter, we wrap its execution into the instrumentation stubs. 1200 // When the called method returns, it will execute the instrumentation 1201 // exit hook that will determine the need of the interpreter with a call 1202 // to Dbg::IsForcedInterpreterNeededForUpcall and deoptimize the stack if 1203 // it is needed. 1204 code = GetQuickInstrumentationEntryPoint(); 1205 } else { 1206 code = called->GetEntryPointFromQuickCompiledCode(); 1207 } 1208 } else if (called_class->IsInitializing()) { 1209 if (UNLIKELY(Dbg::IsForcedInterpreterNeededForResolution(self, called))) { 1210 // If we are single-stepping or the called method is deoptimized (by a 1211 // breakpoint, for example), then we have to execute the called method 1212 // with the interpreter. 1213 code = GetQuickToInterpreterBridge(); 1214 } else if (invoke_type == kStatic) { 1215 // Class is still initializing, go to oat and grab code (trampoline must be left in place 1216 // until class is initialized to stop races between threads). 1217 code = linker->GetQuickOatCodeFor(called); 1218 } else { 1219 // No trampoline for non-static methods. 1220 code = called->GetEntryPointFromQuickCompiledCode(); 1221 } 1222 } else { 1223 DCHECK(called_class->IsErroneous()); 1224 } 1225 } 1226 CHECK_EQ(code == nullptr, self->IsExceptionPending()); 1227 // Fixup any locally saved objects may have moved during a GC. 1228 visitor.FixupReferences(); 1229 // Place called method in callee-save frame to be placed as first argument to quick method. 1230 *sp = called; 1231 1232 return code; 1233 } 1234 1235 /* 1236 * This class uses a couple of observations to unite the different calling conventions through 1237 * a few constants. 1238 * 1239 * 1) Number of registers used for passing is normally even, so counting down has no penalty for 1240 * possible alignment. 1241 * 2) Known 64b architectures store 8B units on the stack, both for integral and floating point 1242 * types, so using uintptr_t is OK. Also means that we can use kRegistersNeededX to denote 1243 * when we have to split things 1244 * 3) The only soft-float, Arm, is 32b, so no widening needs to be taken into account for floats 1245 * and we can use Int handling directly. 1246 * 4) Only 64b architectures widen, and their stack is aligned 8B anyways, so no padding code 1247 * necessary when widening. Also, widening of Ints will take place implicitly, and the 1248 * extension should be compatible with Aarch64, which mandates copying the available bits 1249 * into LSB and leaving the rest unspecified. 1250 * 5) Aligning longs and doubles is necessary on arm only, and it's the same in registers and on 1251 * the stack. 1252 * 6) There is only little endian. 1253 * 1254 * 1255 * Actual work is supposed to be done in a delegate of the template type. The interface is as 1256 * follows: 1257 * 1258 * void PushGpr(uintptr_t): Add a value for the next GPR 1259 * 1260 * void PushFpr4(float): Add a value for the next FPR of size 32b. Is only called if we need 1261 * padding, that is, think the architecture is 32b and aligns 64b. 1262 * 1263 * void PushFpr8(uint64_t): Push a double. We _will_ call this on 32b, it's the callee's job to 1264 * split this if necessary. The current state will have aligned, if 1265 * necessary. 1266 * 1267 * void PushStack(uintptr_t): Push a value to the stack. 1268 * 1269 * uintptr_t PushHandleScope(mirror::Object* ref): Add a reference to the HandleScope. This _will_ have nullptr, 1270 * as this might be important for null initialization. 1271 * Must return the jobject, that is, the reference to the 1272 * entry in the HandleScope (nullptr if necessary). 1273 * 1274 */ 1275 template<class T> class BuildNativeCallFrameStateMachine { 1276 public: 1277 #if defined(__arm__) 1278 // TODO: These are all dummy values! 1279 static constexpr bool kNativeSoftFloatAbi = true; 1280 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs, r0-r3 1281 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 1282 1283 static constexpr size_t kRegistersNeededForLong = 2; 1284 static constexpr size_t kRegistersNeededForDouble = 2; 1285 static constexpr bool kMultiRegistersAligned = true; 1286 static constexpr bool kMultiFPRegistersWidened = false; 1287 static constexpr bool kMultiGPRegistersWidened = false; 1288 static constexpr bool kAlignLongOnStack = true; 1289 static constexpr bool kAlignDoubleOnStack = true; 1290 #elif defined(__aarch64__) 1291 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 1292 static constexpr size_t kNumNativeGprArgs = 8; // 6 arguments passed in GPRs. 1293 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 1294 1295 static constexpr size_t kRegistersNeededForLong = 1; 1296 static constexpr size_t kRegistersNeededForDouble = 1; 1297 static constexpr bool kMultiRegistersAligned = false; 1298 static constexpr bool kMultiFPRegistersWidened = false; 1299 static constexpr bool kMultiGPRegistersWidened = false; 1300 static constexpr bool kAlignLongOnStack = false; 1301 static constexpr bool kAlignDoubleOnStack = false; 1302 #elif defined(__mips__) && !defined(__LP64__) 1303 static constexpr bool kNativeSoftFloatAbi = true; // This is a hard float ABI. 1304 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs. 1305 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 1306 1307 static constexpr size_t kRegistersNeededForLong = 2; 1308 static constexpr size_t kRegistersNeededForDouble = 2; 1309 static constexpr bool kMultiRegistersAligned = true; 1310 static constexpr bool kMultiFPRegistersWidened = true; 1311 static constexpr bool kMultiGPRegistersWidened = false; 1312 static constexpr bool kAlignLongOnStack = true; 1313 static constexpr bool kAlignDoubleOnStack = true; 1314 #elif defined(__mips__) && defined(__LP64__) 1315 // Let the code prepare GPRs only and we will load the FPRs with same data. 1316 static constexpr bool kNativeSoftFloatAbi = true; 1317 static constexpr size_t kNumNativeGprArgs = 8; 1318 static constexpr size_t kNumNativeFprArgs = 0; 1319 1320 static constexpr size_t kRegistersNeededForLong = 1; 1321 static constexpr size_t kRegistersNeededForDouble = 1; 1322 static constexpr bool kMultiRegistersAligned = false; 1323 static constexpr bool kMultiFPRegistersWidened = false; 1324 static constexpr bool kMultiGPRegistersWidened = true; 1325 static constexpr bool kAlignLongOnStack = false; 1326 static constexpr bool kAlignDoubleOnStack = false; 1327 #elif defined(__i386__) 1328 // TODO: Check these! 1329 static constexpr bool kNativeSoftFloatAbi = false; // Not using int registers for fp 1330 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 1331 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 1332 1333 static constexpr size_t kRegistersNeededForLong = 2; 1334 static constexpr size_t kRegistersNeededForDouble = 2; 1335 static constexpr bool kMultiRegistersAligned = false; // x86 not using regs, anyways 1336 static constexpr bool kMultiFPRegistersWidened = false; 1337 static constexpr bool kMultiGPRegistersWidened = false; 1338 static constexpr bool kAlignLongOnStack = false; 1339 static constexpr bool kAlignDoubleOnStack = false; 1340 #elif defined(__x86_64__) 1341 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 1342 static constexpr size_t kNumNativeGprArgs = 6; // 6 arguments passed in GPRs. 1343 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 1344 1345 static constexpr size_t kRegistersNeededForLong = 1; 1346 static constexpr size_t kRegistersNeededForDouble = 1; 1347 static constexpr bool kMultiRegistersAligned = false; 1348 static constexpr bool kMultiFPRegistersWidened = false; 1349 static constexpr bool kMultiGPRegistersWidened = false; 1350 static constexpr bool kAlignLongOnStack = false; 1351 static constexpr bool kAlignDoubleOnStack = false; 1352 #else 1353 #error "Unsupported architecture" 1354 #endif 1355 1356 public: 1357 explicit BuildNativeCallFrameStateMachine(T* delegate) 1358 : gpr_index_(kNumNativeGprArgs), 1359 fpr_index_(kNumNativeFprArgs), 1360 stack_entries_(0), 1361 delegate_(delegate) { 1362 // For register alignment, we want to assume that counters (gpr_index_, fpr_index_) are even iff 1363 // the next register is even; counting down is just to make the compiler happy... 1364 static_assert(kNumNativeGprArgs % 2 == 0U, "Number of native GPR arguments not even"); 1365 static_assert(kNumNativeFprArgs % 2 == 0U, "Number of native FPR arguments not even"); 1366 } 1367 1368 virtual ~BuildNativeCallFrameStateMachine() {} 1369 1370 bool HavePointerGpr() const { 1371 return gpr_index_ > 0; 1372 } 1373 1374 void AdvancePointer(const void* val) { 1375 if (HavePointerGpr()) { 1376 gpr_index_--; 1377 PushGpr(reinterpret_cast<uintptr_t>(val)); 1378 } else { 1379 stack_entries_++; // TODO: have a field for pointer length as multiple of 32b 1380 PushStack(reinterpret_cast<uintptr_t>(val)); 1381 gpr_index_ = 0; 1382 } 1383 } 1384 1385 bool HaveHandleScopeGpr() const { 1386 return gpr_index_ > 0; 1387 } 1388 1389 void AdvanceHandleScope(mirror::Object* ptr) REQUIRES_SHARED(Locks::mutator_lock_) { 1390 uintptr_t handle = PushHandle(ptr); 1391 if (HaveHandleScopeGpr()) { 1392 gpr_index_--; 1393 PushGpr(handle); 1394 } else { 1395 stack_entries_++; 1396 PushStack(handle); 1397 gpr_index_ = 0; 1398 } 1399 } 1400 1401 bool HaveIntGpr() const { 1402 return gpr_index_ > 0; 1403 } 1404 1405 void AdvanceInt(uint32_t val) { 1406 if (HaveIntGpr()) { 1407 gpr_index_--; 1408 if (kMultiGPRegistersWidened) { 1409 DCHECK_EQ(sizeof(uintptr_t), sizeof(int64_t)); 1410 PushGpr(static_cast<int64_t>(bit_cast<int32_t, uint32_t>(val))); 1411 } else { 1412 PushGpr(val); 1413 } 1414 } else { 1415 stack_entries_++; 1416 if (kMultiGPRegistersWidened) { 1417 DCHECK_EQ(sizeof(uintptr_t), sizeof(int64_t)); 1418 PushStack(static_cast<int64_t>(bit_cast<int32_t, uint32_t>(val))); 1419 } else { 1420 PushStack(val); 1421 } 1422 gpr_index_ = 0; 1423 } 1424 } 1425 1426 bool HaveLongGpr() const { 1427 return gpr_index_ >= kRegistersNeededForLong + (LongGprNeedsPadding() ? 1 : 0); 1428 } 1429 1430 bool LongGprNeedsPadding() const { 1431 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1432 kAlignLongOnStack && // and when it needs alignment 1433 (gpr_index_ & 1) == 1; // counter is odd, see constructor 1434 } 1435 1436 bool LongStackNeedsPadding() const { 1437 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1438 kAlignLongOnStack && // and when it needs 8B alignment 1439 (stack_entries_ & 1) == 1; // counter is odd 1440 } 1441 1442 void AdvanceLong(uint64_t val) { 1443 if (HaveLongGpr()) { 1444 if (LongGprNeedsPadding()) { 1445 PushGpr(0); 1446 gpr_index_--; 1447 } 1448 if (kRegistersNeededForLong == 1) { 1449 PushGpr(static_cast<uintptr_t>(val)); 1450 } else { 1451 PushGpr(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1452 PushGpr(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1453 } 1454 gpr_index_ -= kRegistersNeededForLong; 1455 } else { 1456 if (LongStackNeedsPadding()) { 1457 PushStack(0); 1458 stack_entries_++; 1459 } 1460 if (kRegistersNeededForLong == 1) { 1461 PushStack(static_cast<uintptr_t>(val)); 1462 stack_entries_++; 1463 } else { 1464 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1465 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1466 stack_entries_ += 2; 1467 } 1468 gpr_index_ = 0; 1469 } 1470 } 1471 1472 bool HaveFloatFpr() const { 1473 return fpr_index_ > 0; 1474 } 1475 1476 void AdvanceFloat(float val) { 1477 if (kNativeSoftFloatAbi) { 1478 AdvanceInt(bit_cast<uint32_t, float>(val)); 1479 } else { 1480 if (HaveFloatFpr()) { 1481 fpr_index_--; 1482 if (kRegistersNeededForDouble == 1) { 1483 if (kMultiFPRegistersWidened) { 1484 PushFpr8(bit_cast<uint64_t, double>(val)); 1485 } else { 1486 // No widening, just use the bits. 1487 PushFpr8(static_cast<uint64_t>(bit_cast<uint32_t, float>(val))); 1488 } 1489 } else { 1490 PushFpr4(val); 1491 } 1492 } else { 1493 stack_entries_++; 1494 if (kRegistersNeededForDouble == 1 && kMultiFPRegistersWidened) { 1495 // Need to widen before storing: Note the "double" in the template instantiation. 1496 // Note: We need to jump through those hoops to make the compiler happy. 1497 DCHECK_EQ(sizeof(uintptr_t), sizeof(uint64_t)); 1498 PushStack(static_cast<uintptr_t>(bit_cast<uint64_t, double>(val))); 1499 } else { 1500 PushStack(static_cast<uintptr_t>(bit_cast<uint32_t, float>(val))); 1501 } 1502 fpr_index_ = 0; 1503 } 1504 } 1505 } 1506 1507 bool HaveDoubleFpr() const { 1508 return fpr_index_ >= kRegistersNeededForDouble + (DoubleFprNeedsPadding() ? 1 : 0); 1509 } 1510 1511 bool DoubleFprNeedsPadding() const { 1512 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1513 kAlignDoubleOnStack && // and when it needs alignment 1514 (fpr_index_ & 1) == 1; // counter is odd, see constructor 1515 } 1516 1517 bool DoubleStackNeedsPadding() const { 1518 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1519 kAlignDoubleOnStack && // and when it needs 8B alignment 1520 (stack_entries_ & 1) == 1; // counter is odd 1521 } 1522 1523 void AdvanceDouble(uint64_t val) { 1524 if (kNativeSoftFloatAbi) { 1525 AdvanceLong(val); 1526 } else { 1527 if (HaveDoubleFpr()) { 1528 if (DoubleFprNeedsPadding()) { 1529 PushFpr4(0); 1530 fpr_index_--; 1531 } 1532 PushFpr8(val); 1533 fpr_index_ -= kRegistersNeededForDouble; 1534 } else { 1535 if (DoubleStackNeedsPadding()) { 1536 PushStack(0); 1537 stack_entries_++; 1538 } 1539 if (kRegistersNeededForDouble == 1) { 1540 PushStack(static_cast<uintptr_t>(val)); 1541 stack_entries_++; 1542 } else { 1543 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1544 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1545 stack_entries_ += 2; 1546 } 1547 fpr_index_ = 0; 1548 } 1549 } 1550 } 1551 1552 uint32_t GetStackEntries() const { 1553 return stack_entries_; 1554 } 1555 1556 uint32_t GetNumberOfUsedGprs() const { 1557 return kNumNativeGprArgs - gpr_index_; 1558 } 1559 1560 uint32_t GetNumberOfUsedFprs() const { 1561 return kNumNativeFprArgs - fpr_index_; 1562 } 1563 1564 private: 1565 void PushGpr(uintptr_t val) { 1566 delegate_->PushGpr(val); 1567 } 1568 void PushFpr4(float val) { 1569 delegate_->PushFpr4(val); 1570 } 1571 void PushFpr8(uint64_t val) { 1572 delegate_->PushFpr8(val); 1573 } 1574 void PushStack(uintptr_t val) { 1575 delegate_->PushStack(val); 1576 } 1577 uintptr_t PushHandle(mirror::Object* ref) REQUIRES_SHARED(Locks::mutator_lock_) { 1578 return delegate_->PushHandle(ref); 1579 } 1580 1581 uint32_t gpr_index_; // Number of free GPRs 1582 uint32_t fpr_index_; // Number of free FPRs 1583 uint32_t stack_entries_; // Stack entries are in multiples of 32b, as floats are usually not 1584 // extended 1585 T* const delegate_; // What Push implementation gets called 1586 }; 1587 1588 // Computes the sizes of register stacks and call stack area. Handling of references can be extended 1589 // in subclasses. 1590 // 1591 // To handle native pointers, use "L" in the shorty for an object reference, which simulates 1592 // them with handles. 1593 class ComputeNativeCallFrameSize { 1594 public: 1595 ComputeNativeCallFrameSize() : num_stack_entries_(0) {} 1596 1597 virtual ~ComputeNativeCallFrameSize() {} 1598 1599 uint32_t GetStackSize() const { 1600 return num_stack_entries_ * sizeof(uintptr_t); 1601 } 1602 1603 uint8_t* LayoutCallStack(uint8_t* sp8) const { 1604 sp8 -= GetStackSize(); 1605 // Align by kStackAlignment. 1606 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1607 return sp8; 1608 } 1609 1610 uint8_t* LayoutCallRegisterStacks(uint8_t* sp8, uintptr_t** start_gpr, uint32_t** start_fpr) 1611 const { 1612 // Assumption is OK right now, as we have soft-float arm 1613 size_t fregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeFprArgs; 1614 sp8 -= fregs * sizeof(uintptr_t); 1615 *start_fpr = reinterpret_cast<uint32_t*>(sp8); 1616 size_t iregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeGprArgs; 1617 sp8 -= iregs * sizeof(uintptr_t); 1618 *start_gpr = reinterpret_cast<uintptr_t*>(sp8); 1619 return sp8; 1620 } 1621 1622 uint8_t* LayoutNativeCall(uint8_t* sp8, uintptr_t** start_stack, uintptr_t** start_gpr, 1623 uint32_t** start_fpr) const { 1624 // Native call stack. 1625 sp8 = LayoutCallStack(sp8); 1626 *start_stack = reinterpret_cast<uintptr_t*>(sp8); 1627 1628 // Put fprs and gprs below. 1629 sp8 = LayoutCallRegisterStacks(sp8, start_gpr, start_fpr); 1630 1631 // Return the new bottom. 1632 return sp8; 1633 } 1634 1635 virtual void WalkHeader( 1636 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm ATTRIBUTE_UNUSED) 1637 REQUIRES_SHARED(Locks::mutator_lock_) { 1638 } 1639 1640 void Walk(const char* shorty, uint32_t shorty_len) REQUIRES_SHARED(Locks::mutator_lock_) { 1641 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize> sm(this); 1642 1643 WalkHeader(&sm); 1644 1645 for (uint32_t i = 1; i < shorty_len; ++i) { 1646 Primitive::Type cur_type_ = Primitive::GetType(shorty[i]); 1647 switch (cur_type_) { 1648 case Primitive::kPrimNot: 1649 // TODO: fix abuse of mirror types. 1650 sm.AdvanceHandleScope( 1651 reinterpret_cast<mirror::Object*>(0x12345678)); 1652 break; 1653 1654 case Primitive::kPrimBoolean: 1655 case Primitive::kPrimByte: 1656 case Primitive::kPrimChar: 1657 case Primitive::kPrimShort: 1658 case Primitive::kPrimInt: 1659 sm.AdvanceInt(0); 1660 break; 1661 case Primitive::kPrimFloat: 1662 sm.AdvanceFloat(0); 1663 break; 1664 case Primitive::kPrimDouble: 1665 sm.AdvanceDouble(0); 1666 break; 1667 case Primitive::kPrimLong: 1668 sm.AdvanceLong(0); 1669 break; 1670 default: 1671 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty; 1672 UNREACHABLE(); 1673 } 1674 } 1675 1676 num_stack_entries_ = sm.GetStackEntries(); 1677 } 1678 1679 void PushGpr(uintptr_t /* val */) { 1680 // not optimizing registers, yet 1681 } 1682 1683 void PushFpr4(float /* val */) { 1684 // not optimizing registers, yet 1685 } 1686 1687 void PushFpr8(uint64_t /* val */) { 1688 // not optimizing registers, yet 1689 } 1690 1691 void PushStack(uintptr_t /* val */) { 1692 // counting is already done in the superclass 1693 } 1694 1695 virtual uintptr_t PushHandle(mirror::Object* /* ptr */) { 1696 return reinterpret_cast<uintptr_t>(nullptr); 1697 } 1698 1699 protected: 1700 uint32_t num_stack_entries_; 1701 }; 1702 1703 class ComputeGenericJniFrameSize FINAL : public ComputeNativeCallFrameSize { 1704 public: 1705 explicit ComputeGenericJniFrameSize(bool critical_native) 1706 : num_handle_scope_references_(0), critical_native_(critical_native) {} 1707 1708 // Lays out the callee-save frame. Assumes that the incorrect frame corresponding to RefsAndArgs 1709 // is at *m = sp. Will update to point to the bottom of the save frame. 1710 // 1711 // Note: assumes ComputeAll() has been run before. 1712 void LayoutCalleeSaveFrame(Thread* self, ArtMethod*** m, void* sp, HandleScope** handle_scope) 1713 REQUIRES_SHARED(Locks::mutator_lock_) { 1714 ArtMethod* method = **m; 1715 1716 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 1717 1718 uint8_t* sp8 = reinterpret_cast<uint8_t*>(sp); 1719 1720 // First, fix up the layout of the callee-save frame. 1721 // We have to squeeze in the HandleScope, and relocate the method pointer. 1722 1723 // "Free" the slot for the method. 1724 sp8 += sizeof(void*); // In the callee-save frame we use a full pointer. 1725 1726 // Under the callee saves put handle scope and new method stack reference. 1727 size_t handle_scope_size = HandleScope::SizeOf(num_handle_scope_references_); 1728 size_t scope_and_method = handle_scope_size + sizeof(ArtMethod*); 1729 1730 sp8 -= scope_and_method; 1731 // Align by kStackAlignment. 1732 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1733 1734 uint8_t* sp8_table = sp8 + sizeof(ArtMethod*); 1735 *handle_scope = HandleScope::Create(sp8_table, self->GetTopHandleScope(), 1736 num_handle_scope_references_); 1737 1738 // Add a slot for the method pointer, and fill it. Fix the pointer-pointer given to us. 1739 uint8_t* method_pointer = sp8; 1740 auto** new_method_ref = reinterpret_cast<ArtMethod**>(method_pointer); 1741 *new_method_ref = method; 1742 *m = new_method_ref; 1743 } 1744 1745 // Adds space for the cookie. Note: may leave stack unaligned. 1746 void LayoutCookie(uint8_t** sp) const { 1747 // Reference cookie and padding 1748 *sp -= 8; 1749 } 1750 1751 // Re-layout the callee-save frame (insert a handle-scope). Then add space for the cookie. 1752 // Returns the new bottom. Note: this may be unaligned. 1753 uint8_t* LayoutJNISaveFrame(Thread* self, ArtMethod*** m, void* sp, HandleScope** handle_scope) 1754 REQUIRES_SHARED(Locks::mutator_lock_) { 1755 // First, fix up the layout of the callee-save frame. 1756 // We have to squeeze in the HandleScope, and relocate the method pointer. 1757 LayoutCalleeSaveFrame(self, m, sp, handle_scope); 1758 1759 // The bottom of the callee-save frame is now where the method is, *m. 1760 uint8_t* sp8 = reinterpret_cast<uint8_t*>(*m); 1761 1762 // Add space for cookie. 1763 LayoutCookie(&sp8); 1764 1765 return sp8; 1766 } 1767 1768 // WARNING: After this, *sp won't be pointing to the method anymore! 1769 uint8_t* ComputeLayout(Thread* self, ArtMethod*** m, const char* shorty, uint32_t shorty_len, 1770 HandleScope** handle_scope, uintptr_t** start_stack, uintptr_t** start_gpr, 1771 uint32_t** start_fpr) 1772 REQUIRES_SHARED(Locks::mutator_lock_) { 1773 Walk(shorty, shorty_len); 1774 1775 // JNI part. 1776 uint8_t* sp8 = LayoutJNISaveFrame(self, m, reinterpret_cast<void*>(*m), handle_scope); 1777 1778 sp8 = LayoutNativeCall(sp8, start_stack, start_gpr, start_fpr); 1779 1780 // Return the new bottom. 1781 return sp8; 1782 } 1783 1784 uintptr_t PushHandle(mirror::Object* /* ptr */) OVERRIDE; 1785 1786 // Add JNIEnv* and jobj/jclass before the shorty-derived elements. 1787 void WalkHeader(BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) OVERRIDE 1788 REQUIRES_SHARED(Locks::mutator_lock_); 1789 1790 private: 1791 uint32_t num_handle_scope_references_; 1792 const bool critical_native_; 1793 }; 1794 1795 uintptr_t ComputeGenericJniFrameSize::PushHandle(mirror::Object* /* ptr */) { 1796 num_handle_scope_references_++; 1797 return reinterpret_cast<uintptr_t>(nullptr); 1798 } 1799 1800 void ComputeGenericJniFrameSize::WalkHeader( 1801 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) { 1802 // First 2 parameters are always excluded for @CriticalNative. 1803 if (UNLIKELY(critical_native_)) { 1804 return; 1805 } 1806 1807 // JNIEnv 1808 sm->AdvancePointer(nullptr); 1809 1810 // Class object or this as first argument 1811 sm->AdvanceHandleScope(reinterpret_cast<mirror::Object*>(0x12345678)); 1812 } 1813 1814 // Class to push values to three separate regions. Used to fill the native call part. Adheres to 1815 // the template requirements of BuildGenericJniFrameStateMachine. 1816 class FillNativeCall { 1817 public: 1818 FillNativeCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) : 1819 cur_gpr_reg_(gpr_regs), cur_fpr_reg_(fpr_regs), cur_stack_arg_(stack_args) {} 1820 1821 virtual ~FillNativeCall() {} 1822 1823 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) { 1824 cur_gpr_reg_ = gpr_regs; 1825 cur_fpr_reg_ = fpr_regs; 1826 cur_stack_arg_ = stack_args; 1827 } 1828 1829 void PushGpr(uintptr_t val) { 1830 *cur_gpr_reg_ = val; 1831 cur_gpr_reg_++; 1832 } 1833 1834 void PushFpr4(float val) { 1835 *cur_fpr_reg_ = val; 1836 cur_fpr_reg_++; 1837 } 1838 1839 void PushFpr8(uint64_t val) { 1840 uint64_t* tmp = reinterpret_cast<uint64_t*>(cur_fpr_reg_); 1841 *tmp = val; 1842 cur_fpr_reg_ += 2; 1843 } 1844 1845 void PushStack(uintptr_t val) { 1846 *cur_stack_arg_ = val; 1847 cur_stack_arg_++; 1848 } 1849 1850 virtual uintptr_t PushHandle(mirror::Object*) REQUIRES_SHARED(Locks::mutator_lock_) { 1851 LOG(FATAL) << "(Non-JNI) Native call does not use handles."; 1852 UNREACHABLE(); 1853 } 1854 1855 private: 1856 uintptr_t* cur_gpr_reg_; 1857 uint32_t* cur_fpr_reg_; 1858 uintptr_t* cur_stack_arg_; 1859 }; 1860 1861 // Visits arguments on the stack placing them into a region lower down the stack for the benefit 1862 // of transitioning into native code. 1863 class BuildGenericJniFrameVisitor FINAL : public QuickArgumentVisitor { 1864 public: 1865 BuildGenericJniFrameVisitor(Thread* self, 1866 bool is_static, 1867 bool critical_native, 1868 const char* shorty, 1869 uint32_t shorty_len, 1870 ArtMethod*** sp) 1871 : QuickArgumentVisitor(*sp, is_static, shorty, shorty_len), 1872 jni_call_(nullptr, nullptr, nullptr, nullptr, critical_native), 1873 sm_(&jni_call_) { 1874 ComputeGenericJniFrameSize fsc(critical_native); 1875 uintptr_t* start_gpr_reg; 1876 uint32_t* start_fpr_reg; 1877 uintptr_t* start_stack_arg; 1878 bottom_of_used_area_ = fsc.ComputeLayout(self, sp, shorty, shorty_len, 1879 &handle_scope_, 1880 &start_stack_arg, 1881 &start_gpr_reg, &start_fpr_reg); 1882 1883 jni_call_.Reset(start_gpr_reg, start_fpr_reg, start_stack_arg, handle_scope_); 1884 1885 // First 2 parameters are always excluded for CriticalNative methods. 1886 if (LIKELY(!critical_native)) { 1887 // jni environment is always first argument 1888 sm_.AdvancePointer(self->GetJniEnv()); 1889 1890 if (is_static) { 1891 sm_.AdvanceHandleScope((**sp)->GetDeclaringClass()); 1892 } // else "this" reference is already handled by QuickArgumentVisitor. 1893 } 1894 } 1895 1896 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 1897 1898 void FinalizeHandleScope(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_); 1899 1900 StackReference<mirror::Object>* GetFirstHandleScopeEntry() { 1901 return handle_scope_->GetHandle(0).GetReference(); 1902 } 1903 1904 jobject GetFirstHandleScopeJObject() const REQUIRES_SHARED(Locks::mutator_lock_) { 1905 return handle_scope_->GetHandle(0).ToJObject(); 1906 } 1907 1908 void* GetBottomOfUsedArea() const { 1909 return bottom_of_used_area_; 1910 } 1911 1912 private: 1913 // A class to fill a JNI call. Adds reference/handle-scope management to FillNativeCall. 1914 class FillJniCall FINAL : public FillNativeCall { 1915 public: 1916 FillJniCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, 1917 HandleScope* handle_scope, bool critical_native) 1918 : FillNativeCall(gpr_regs, fpr_regs, stack_args), 1919 handle_scope_(handle_scope), 1920 cur_entry_(0), 1921 critical_native_(critical_native) {} 1922 1923 uintptr_t PushHandle(mirror::Object* ref) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_); 1924 1925 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, HandleScope* scope) { 1926 FillNativeCall::Reset(gpr_regs, fpr_regs, stack_args); 1927 handle_scope_ = scope; 1928 cur_entry_ = 0U; 1929 } 1930 1931 void ResetRemainingScopeSlots() REQUIRES_SHARED(Locks::mutator_lock_) { 1932 // Initialize padding entries. 1933 size_t expected_slots = handle_scope_->NumberOfReferences(); 1934 while (cur_entry_ < expected_slots) { 1935 handle_scope_->GetMutableHandle(cur_entry_++).Assign(nullptr); 1936 } 1937 1938 if (!critical_native_) { 1939 // Non-critical natives have at least the self class (jclass) or this (jobject). 1940 DCHECK_NE(cur_entry_, 0U); 1941 } 1942 } 1943 1944 bool CriticalNative() const { 1945 return critical_native_; 1946 } 1947 1948 private: 1949 HandleScope* handle_scope_; 1950 size_t cur_entry_; 1951 const bool critical_native_; 1952 }; 1953 1954 HandleScope* handle_scope_; 1955 FillJniCall jni_call_; 1956 void* bottom_of_used_area_; 1957 1958 BuildNativeCallFrameStateMachine<FillJniCall> sm_; 1959 1960 DISALLOW_COPY_AND_ASSIGN(BuildGenericJniFrameVisitor); 1961 }; 1962 1963 uintptr_t BuildGenericJniFrameVisitor::FillJniCall::PushHandle(mirror::Object* ref) { 1964 uintptr_t tmp; 1965 MutableHandle<mirror::Object> h = handle_scope_->GetMutableHandle(cur_entry_); 1966 h.Assign(ref); 1967 tmp = reinterpret_cast<uintptr_t>(h.ToJObject()); 1968 cur_entry_++; 1969 return tmp; 1970 } 1971 1972 void BuildGenericJniFrameVisitor::Visit() { 1973 Primitive::Type type = GetParamPrimitiveType(); 1974 switch (type) { 1975 case Primitive::kPrimLong: { 1976 jlong long_arg; 1977 if (IsSplitLongOrDouble()) { 1978 long_arg = ReadSplitLongParam(); 1979 } else { 1980 long_arg = *reinterpret_cast<jlong*>(GetParamAddress()); 1981 } 1982 sm_.AdvanceLong(long_arg); 1983 break; 1984 } 1985 case Primitive::kPrimDouble: { 1986 uint64_t double_arg; 1987 if (IsSplitLongOrDouble()) { 1988 // Read into union so that we don't case to a double. 1989 double_arg = ReadSplitLongParam(); 1990 } else { 1991 double_arg = *reinterpret_cast<uint64_t*>(GetParamAddress()); 1992 } 1993 sm_.AdvanceDouble(double_arg); 1994 break; 1995 } 1996 case Primitive::kPrimNot: { 1997 StackReference<mirror::Object>* stack_ref = 1998 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 1999 sm_.AdvanceHandleScope(stack_ref->AsMirrorPtr()); 2000 break; 2001 } 2002 case Primitive::kPrimFloat: 2003 sm_.AdvanceFloat(*reinterpret_cast<float*>(GetParamAddress())); 2004 break; 2005 case Primitive::kPrimBoolean: // Fall-through. 2006 case Primitive::kPrimByte: // Fall-through. 2007 case Primitive::kPrimChar: // Fall-through. 2008 case Primitive::kPrimShort: // Fall-through. 2009 case Primitive::kPrimInt: // Fall-through. 2010 sm_.AdvanceInt(*reinterpret_cast<jint*>(GetParamAddress())); 2011 break; 2012 case Primitive::kPrimVoid: 2013 LOG(FATAL) << "UNREACHABLE"; 2014 UNREACHABLE(); 2015 } 2016 } 2017 2018 void BuildGenericJniFrameVisitor::FinalizeHandleScope(Thread* self) { 2019 // Clear out rest of the scope. 2020 jni_call_.ResetRemainingScopeSlots(); 2021 if (!jni_call_.CriticalNative()) { 2022 // Install HandleScope. 2023 self->PushHandleScope(handle_scope_); 2024 } 2025 } 2026 2027 #if defined(__arm__) || defined(__aarch64__) 2028 extern "C" const void* artFindNativeMethod(); 2029 #else 2030 extern "C" const void* artFindNativeMethod(Thread* self); 2031 #endif 2032 2033 static uint64_t artQuickGenericJniEndJNIRef(Thread* self, 2034 uint32_t cookie, 2035 bool fast_native ATTRIBUTE_UNUSED, 2036 jobject l, 2037 jobject lock) { 2038 // TODO: add entrypoints for @FastNative returning objects. 2039 if (lock != nullptr) { 2040 return reinterpret_cast<uint64_t>(JniMethodEndWithReferenceSynchronized(l, cookie, lock, self)); 2041 } else { 2042 return reinterpret_cast<uint64_t>(JniMethodEndWithReference(l, cookie, self)); 2043 } 2044 } 2045 2046 static void artQuickGenericJniEndJNINonRef(Thread* self, 2047 uint32_t cookie, 2048 bool fast_native, 2049 jobject lock) { 2050 if (lock != nullptr) { 2051 JniMethodEndSynchronized(cookie, lock, self); 2052 // Ignore "fast_native" here because synchronized functions aren't very fast. 2053 } else { 2054 if (UNLIKELY(fast_native)) { 2055 JniMethodFastEnd(cookie, self); 2056 } else { 2057 JniMethodEnd(cookie, self); 2058 } 2059 } 2060 } 2061 2062 /* 2063 * Initializes an alloca region assumed to be directly below sp for a native call: 2064 * Create a HandleScope and call stack and fill a mini stack with values to be pushed to registers. 2065 * The final element on the stack is a pointer to the native code. 2066 * 2067 * On entry, the stack has a standard callee-save frame above sp, and an alloca below it. 2068 * We need to fix this, as the handle scope needs to go into the callee-save frame. 2069 * 2070 * The return of this function denotes: 2071 * 1) How many bytes of the alloca can be released, if the value is non-negative. 2072 * 2) An error, if the value is negative. 2073 */ 2074 extern "C" TwoWordReturn artQuickGenericJniTrampoline(Thread* self, ArtMethod** sp) 2075 REQUIRES_SHARED(Locks::mutator_lock_) { 2076 ArtMethod* called = *sp; 2077 DCHECK(called->IsNative()) << called->PrettyMethod(true); 2078 // Fix up a callee-save frame at the bottom of the stack (at `*sp`, 2079 // above the alloca region) while we check for optimization 2080 // annotations, thus allowing stack walking until the completion of 2081 // the JNI frame creation. 2082 // 2083 // Note however that the Generic JNI trampoline does not expect 2084 // exception being thrown at that stage. 2085 *sp = Runtime::Current()->GetCalleeSaveMethod(Runtime::CalleeSaveType::kSaveRefsAndArgs); 2086 self->SetTopOfStack(sp); 2087 uint32_t shorty_len = 0; 2088 const char* shorty = called->GetShorty(&shorty_len); 2089 // Optimization annotations lookup does not try to resolve classes, 2090 // as this may throw an exception, which is not supported by the 2091 // Generic JNI trampoline at this stage; instead, method's 2092 // annotations' classes are looked up in the bootstrap class 2093 // loader's resolved types (which won't trigger an exception). 2094 bool critical_native = called->IsAnnotatedWithCriticalNative(); 2095 // ArtMethod::IsAnnotatedWithCriticalNative should not throw 2096 // an exception; clear it if it happened anyway. 2097 // TODO: Revisit this code path and turn this into a CHECK(!self->IsExceptionPending()). 2098 if (self->IsExceptionPending()) { 2099 self->ClearException(); 2100 } 2101 bool fast_native = called->IsAnnotatedWithFastNative(); 2102 // ArtMethod::IsAnnotatedWithFastNative should not throw 2103 // an exception; clear it if it happened anyway. 2104 // TODO: Revisit this code path and turn this into a CHECK(!self->IsExceptionPending()). 2105 if (self->IsExceptionPending()) { 2106 self->ClearException(); 2107 } 2108 bool normal_native = !critical_native && !fast_native; 2109 // Restore the initial ArtMethod pointer at `*sp`. 2110 *sp = called; 2111 2112 // Run the visitor and update sp. 2113 BuildGenericJniFrameVisitor visitor(self, 2114 called->IsStatic(), 2115 critical_native, 2116 shorty, 2117 shorty_len, 2118 &sp); 2119 { 2120 ScopedAssertNoThreadSuspension sants(__FUNCTION__); 2121 visitor.VisitArguments(); 2122 // FinalizeHandleScope pushes the handle scope on the thread. 2123 visitor.FinalizeHandleScope(self); 2124 } 2125 2126 // Fix up managed-stack things in Thread. 2127 self->SetTopOfStack(sp); 2128 2129 self->VerifyStack(); 2130 2131 uint32_t cookie; 2132 uint32_t* sp32; 2133 // Skip calling JniMethodStart for @CriticalNative. 2134 if (LIKELY(!critical_native)) { 2135 // Start JNI, save the cookie. 2136 if (called->IsSynchronized()) { 2137 DCHECK(normal_native) << " @FastNative and synchronize is not supported"; 2138 cookie = JniMethodStartSynchronized(visitor.GetFirstHandleScopeJObject(), self); 2139 if (self->IsExceptionPending()) { 2140 self->PopHandleScope(); 2141 // A negative value denotes an error. 2142 return GetTwoWordFailureValue(); 2143 } 2144 } else { 2145 if (fast_native) { 2146 cookie = JniMethodFastStart(self); 2147 } else { 2148 DCHECK(normal_native); 2149 cookie = JniMethodStart(self); 2150 } 2151 } 2152 sp32 = reinterpret_cast<uint32_t*>(sp); 2153 *(sp32 - 1) = cookie; 2154 } 2155 2156 // Retrieve the stored native code. 2157 void const* nativeCode = called->GetEntryPointFromJni(); 2158 2159 // There are two cases for the content of nativeCode: 2160 // 1) Pointer to the native function. 2161 // 2) Pointer to the trampoline for native code binding. 2162 // In the second case, we need to execute the binding and continue with the actual native function 2163 // pointer. 2164 DCHECK(nativeCode != nullptr); 2165 if (nativeCode == GetJniDlsymLookupStub()) { 2166 #if defined(__arm__) || defined(__aarch64__) 2167 nativeCode = artFindNativeMethod(); 2168 #else 2169 nativeCode = artFindNativeMethod(self); 2170 #endif 2171 2172 if (nativeCode == nullptr) { 2173 DCHECK(self->IsExceptionPending()); // There should be an exception pending now. 2174 2175 // @CriticalNative calls do not need to call back into JniMethodEnd. 2176 if (LIKELY(!critical_native)) { 2177 // End JNI, as the assembly will move to deliver the exception. 2178 jobject lock = called->IsSynchronized() ? visitor.GetFirstHandleScopeJObject() : nullptr; 2179 if (shorty[0] == 'L') { 2180 artQuickGenericJniEndJNIRef(self, cookie, fast_native, nullptr, lock); 2181 } else { 2182 artQuickGenericJniEndJNINonRef(self, cookie, fast_native, lock); 2183 } 2184 } 2185 2186 return GetTwoWordFailureValue(); 2187 } 2188 // Note that the native code pointer will be automatically set by artFindNativeMethod(). 2189 } 2190 2191 #if defined(__mips__) && !defined(__LP64__) 2192 // On MIPS32 if the first two arguments are floating-point, we need to know their types 2193 // so that art_quick_generic_jni_trampoline can correctly extract them from the stack 2194 // and load into floating-point registers. 2195 // Possible arrangements of first two floating-point arguments on the stack (32-bit FPU 2196 // view): 2197 // (1) 2198 // | DOUBLE | DOUBLE | other args, if any 2199 // | F12 | F13 | F14 | F15 | 2200 // | SP+0 | SP+4 | SP+8 | SP+12 | SP+16 2201 // (2) 2202 // | DOUBLE | FLOAT | (PAD) | other args, if any 2203 // | F12 | F13 | F14 | | 2204 // | SP+0 | SP+4 | SP+8 | SP+12 | SP+16 2205 // (3) 2206 // | FLOAT | (PAD) | DOUBLE | other args, if any 2207 // | F12 | | F14 | F15 | 2208 // | SP+0 | SP+4 | SP+8 | SP+12 | SP+16 2209 // (4) 2210 // | FLOAT | FLOAT | other args, if any 2211 // | F12 | F14 | 2212 // | SP+0 | SP+4 | SP+8 2213 // As you can see, only the last case (4) is special. In all others we can just 2214 // load F12/F13 and F14/F15 in the same manner. 2215 // Set bit 0 of the native code address to 1 in this case (valid code addresses 2216 // are always a multiple of 4 on MIPS32, so we have 2 spare bits available). 2217 if (nativeCode != nullptr && 2218 shorty != nullptr && 2219 shorty_len >= 3 && 2220 shorty[1] == 'F' && 2221 shorty[2] == 'F') { 2222 nativeCode = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(nativeCode) | 1); 2223 } 2224 #endif 2225 2226 // Return native code addr(lo) and bottom of alloca address(hi). 2227 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(visitor.GetBottomOfUsedArea()), 2228 reinterpret_cast<uintptr_t>(nativeCode)); 2229 } 2230 2231 // Defined in quick_jni_entrypoints.cc. 2232 extern uint64_t GenericJniMethodEnd(Thread* self, uint32_t saved_local_ref_cookie, 2233 jvalue result, uint64_t result_f, ArtMethod* called, 2234 HandleScope* handle_scope); 2235 /* 2236 * Is called after the native JNI code. Responsible for cleanup (handle scope, saved state) and 2237 * unlocking. 2238 */ 2239 extern "C" uint64_t artQuickGenericJniEndTrampoline(Thread* self, 2240 jvalue result, 2241 uint64_t result_f) { 2242 // We're here just back from a native call. We don't have the shared mutator lock at this point 2243 // yet until we call GoToRunnable() later in GenericJniMethodEnd(). Accessing objects or doing 2244 // anything that requires a mutator lock before that would cause problems as GC may have the 2245 // exclusive mutator lock and may be moving objects, etc. 2246 ArtMethod** sp = self->GetManagedStack()->GetTopQuickFrame(); 2247 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 2248 ArtMethod* called = *sp; 2249 uint32_t cookie = *(sp32 - 1); 2250 HandleScope* table = reinterpret_cast<HandleScope*>(reinterpret_cast<uint8_t*>(sp) + sizeof(*sp)); 2251 return GenericJniMethodEnd(self, cookie, result, result_f, called, table); 2252 } 2253 2254 // We use TwoWordReturn to optimize scalar returns. We use the hi value for code, and the lo value 2255 // for the method pointer. 2256 // 2257 // It is valid to use this, as at the usage points here (returns from C functions) we are assuming 2258 // to hold the mutator lock (see REQUIRES_SHARED(Locks::mutator_lock_) annotations). 2259 2260 template<InvokeType type, bool access_check> 2261 static TwoWordReturn artInvokeCommon(uint32_t method_idx, 2262 ObjPtr<mirror::Object> this_object, 2263 Thread* self, 2264 ArtMethod** sp) { 2265 ScopedQuickEntrypointChecks sqec(self); 2266 DCHECK_EQ(*sp, Runtime::Current()->GetCalleeSaveMethod(Runtime::kSaveRefsAndArgs)); 2267 ArtMethod* caller_method = QuickArgumentVisitor::GetCallingMethod(sp); 2268 ArtMethod* method = FindMethodFast(method_idx, this_object, caller_method, access_check, type); 2269 if (UNLIKELY(method == nullptr)) { 2270 const DexFile* dex_file = caller_method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 2271 uint32_t shorty_len; 2272 const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(method_idx), &shorty_len); 2273 { 2274 // Remember the args in case a GC happens in FindMethodFromCode. 2275 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 2276 RememberForGcArgumentVisitor visitor(sp, type == kStatic, shorty, shorty_len, &soa); 2277 visitor.VisitArguments(); 2278 method = FindMethodFromCode<type, access_check>(method_idx, 2279 &this_object, 2280 caller_method, 2281 self); 2282 visitor.FixupReferences(); 2283 } 2284 2285 if (UNLIKELY(method == nullptr)) { 2286 CHECK(self->IsExceptionPending()); 2287 return GetTwoWordFailureValue(); // Failure. 2288 } 2289 } 2290 DCHECK(!self->IsExceptionPending()); 2291 const void* code = method->GetEntryPointFromQuickCompiledCode(); 2292 2293 // When we return, the caller will branch to this address, so it had better not be 0! 2294 DCHECK(code != nullptr) << "Code was null in method: " << method->PrettyMethod() 2295 << " location: " 2296 << method->GetDexFile()->GetLocation(); 2297 2298 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 2299 reinterpret_cast<uintptr_t>(method)); 2300 } 2301 2302 // Explicit artInvokeCommon template function declarations to please analysis tool. 2303 #define EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(type, access_check) \ 2304 template REQUIRES_SHARED(Locks::mutator_lock_) \ 2305 TwoWordReturn artInvokeCommon<type, access_check>( \ 2306 uint32_t method_idx, ObjPtr<mirror::Object> his_object, Thread* self, ArtMethod** sp) 2307 2308 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, false); 2309 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, true); 2310 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, false); 2311 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, true); 2312 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, false); 2313 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, true); 2314 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, false); 2315 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, true); 2316 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, false); 2317 EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, true); 2318 #undef EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL 2319 2320 // See comments in runtime_support_asm.S 2321 extern "C" TwoWordReturn artInvokeInterfaceTrampolineWithAccessCheck( 2322 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2323 REQUIRES_SHARED(Locks::mutator_lock_) { 2324 return artInvokeCommon<kInterface, true>(method_idx, this_object, self, sp); 2325 } 2326 2327 extern "C" TwoWordReturn artInvokeDirectTrampolineWithAccessCheck( 2328 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2329 REQUIRES_SHARED(Locks::mutator_lock_) { 2330 return artInvokeCommon<kDirect, true>(method_idx, this_object, self, sp); 2331 } 2332 2333 extern "C" TwoWordReturn artInvokeStaticTrampolineWithAccessCheck( 2334 uint32_t method_idx, 2335 mirror::Object* this_object ATTRIBUTE_UNUSED, 2336 Thread* self, 2337 ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 2338 // For static, this_object is not required and may be random garbage. Don't pass it down so that 2339 // it doesn't cause ObjPtr alignment failure check. 2340 return artInvokeCommon<kStatic, true>(method_idx, nullptr, self, sp); 2341 } 2342 2343 extern "C" TwoWordReturn artInvokeSuperTrampolineWithAccessCheck( 2344 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2345 REQUIRES_SHARED(Locks::mutator_lock_) { 2346 return artInvokeCommon<kSuper, true>(method_idx, this_object, self, sp); 2347 } 2348 2349 extern "C" TwoWordReturn artInvokeVirtualTrampolineWithAccessCheck( 2350 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2351 REQUIRES_SHARED(Locks::mutator_lock_) { 2352 return artInvokeCommon<kVirtual, true>(method_idx, this_object, self, sp); 2353 } 2354 2355 // Determine target of interface dispatch. The interface method and this object are known non-null. 2356 // The interface method is the method returned by the dex cache in the conflict trampoline. 2357 extern "C" TwoWordReturn artInvokeInterfaceTrampoline(ArtMethod* interface_method, 2358 mirror::Object* raw_this_object, 2359 Thread* self, 2360 ArtMethod** sp) 2361 REQUIRES_SHARED(Locks::mutator_lock_) { 2362 CHECK(interface_method != nullptr); 2363 ObjPtr<mirror::Object> this_object(raw_this_object); 2364 ScopedQuickEntrypointChecks sqec(self); 2365 StackHandleScope<1> hs(self); 2366 Handle<mirror::Class> cls(hs.NewHandle(this_object->GetClass())); 2367 2368 ArtMethod* caller_method = QuickArgumentVisitor::GetCallingMethod(sp); 2369 ArtMethod* method = nullptr; 2370 ImTable* imt = cls->GetImt(kRuntimePointerSize); 2371 2372 if (LIKELY(interface_method->GetDexMethodIndex() != DexFile::kDexNoIndex)) { 2373 // If the interface method is already resolved, look whether we have a match in the 2374 // ImtConflictTable. 2375 ArtMethod* conflict_method = imt->Get(ImTable::GetImtIndex(interface_method), 2376 kRuntimePointerSize); 2377 if (LIKELY(conflict_method->IsRuntimeMethod())) { 2378 ImtConflictTable* current_table = conflict_method->GetImtConflictTable(kRuntimePointerSize); 2379 DCHECK(current_table != nullptr); 2380 method = current_table->Lookup(interface_method, kRuntimePointerSize); 2381 } else { 2382 // It seems we aren't really a conflict method! 2383 method = cls->FindVirtualMethodForInterface(interface_method, kRuntimePointerSize); 2384 } 2385 if (method != nullptr) { 2386 return GetTwoWordSuccessValue( 2387 reinterpret_cast<uintptr_t>(method->GetEntryPointFromQuickCompiledCode()), 2388 reinterpret_cast<uintptr_t>(method)); 2389 } 2390 2391 // No match, use the IfTable. 2392 method = cls->FindVirtualMethodForInterface(interface_method, kRuntimePointerSize); 2393 if (UNLIKELY(method == nullptr)) { 2394 ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch( 2395 interface_method, this_object, caller_method); 2396 return GetTwoWordFailureValue(); // Failure. 2397 } 2398 } else { 2399 // The interface method is unresolved, so look it up in the dex file of the caller. 2400 DCHECK_EQ(interface_method, Runtime::Current()->GetResolutionMethod()); 2401 2402 // Fetch the dex_method_idx of the target interface method from the caller. 2403 uint32_t dex_method_idx; 2404 uint32_t dex_pc = QuickArgumentVisitor::GetCallingDexPc(sp); 2405 const DexFile::CodeItem* code_item = caller_method->GetCodeItem(); 2406 DCHECK_LT(dex_pc, code_item->insns_size_in_code_units_); 2407 const Instruction* instr = Instruction::At(&code_item->insns_[dex_pc]); 2408 Instruction::Code instr_code = instr->Opcode(); 2409 DCHECK(instr_code == Instruction::INVOKE_INTERFACE || 2410 instr_code == Instruction::INVOKE_INTERFACE_RANGE) 2411 << "Unexpected call into interface trampoline: " << instr->DumpString(nullptr); 2412 if (instr_code == Instruction::INVOKE_INTERFACE) { 2413 dex_method_idx = instr->VRegB_35c(); 2414 } else { 2415 DCHECK_EQ(instr_code, Instruction::INVOKE_INTERFACE_RANGE); 2416 dex_method_idx = instr->VRegB_3rc(); 2417 } 2418 2419 const DexFile* dex_file = caller_method->GetDeclaringClass()->GetDexCache() 2420 ->GetDexFile(); 2421 uint32_t shorty_len; 2422 const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(dex_method_idx), 2423 &shorty_len); 2424 { 2425 // Remember the args in case a GC happens in FindMethodFromCode. 2426 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 2427 RememberForGcArgumentVisitor visitor(sp, false, shorty, shorty_len, &soa); 2428 visitor.VisitArguments(); 2429 method = FindMethodFromCode<kInterface, false>(dex_method_idx, 2430 &this_object, 2431 caller_method, 2432 self); 2433 visitor.FixupReferences(); 2434 } 2435 2436 if (UNLIKELY(method == nullptr)) { 2437 CHECK(self->IsExceptionPending()); 2438 return GetTwoWordFailureValue(); // Failure. 2439 } 2440 interface_method = 2441 caller_method->GetDexCacheResolvedMethod(dex_method_idx, kRuntimePointerSize); 2442 DCHECK(!interface_method->IsRuntimeMethod()); 2443 } 2444 2445 // We arrive here if we have found an implementation, and it is not in the ImtConflictTable. 2446 // We create a new table with the new pair { interface_method, method }. 2447 uint32_t imt_index = ImTable::GetImtIndex(interface_method); 2448 ArtMethod* conflict_method = imt->Get(imt_index, kRuntimePointerSize); 2449 if (conflict_method->IsRuntimeMethod()) { 2450 ArtMethod* new_conflict_method = Runtime::Current()->GetClassLinker()->AddMethodToConflictTable( 2451 cls.Get(), 2452 conflict_method, 2453 interface_method, 2454 method, 2455 /*force_new_conflict_method*/false); 2456 if (new_conflict_method != conflict_method) { 2457 // Update the IMT if we create a new conflict method. No fence needed here, as the 2458 // data is consistent. 2459 imt->Set(imt_index, 2460 new_conflict_method, 2461 kRuntimePointerSize); 2462 } 2463 } 2464 2465 const void* code = method->GetEntryPointFromQuickCompiledCode(); 2466 2467 // When we return, the caller will branch to this address, so it had better not be 0! 2468 DCHECK(code != nullptr) << "Code was null in method: " << method->PrettyMethod() 2469 << " location: " << method->GetDexFile()->GetLocation(); 2470 2471 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 2472 reinterpret_cast<uintptr_t>(method)); 2473 } 2474 2475 // Returns shorty type so the caller can determine how to put |result| 2476 // into expected registers. The shorty type is static so the compiler 2477 // could call different flavors of this code path depending on the 2478 // shorty type though this would require different entry points for 2479 // each type. 2480 extern "C" uintptr_t artInvokePolymorphic( 2481 JValue* result, 2482 mirror::Object* raw_method_handle, 2483 Thread* self, 2484 ArtMethod** sp) 2485 REQUIRES_SHARED(Locks::mutator_lock_) { 2486 ScopedQuickEntrypointChecks sqec(self); 2487 DCHECK_EQ(*sp, Runtime::Current()->GetCalleeSaveMethod(Runtime::kSaveRefsAndArgs)); 2488 2489 // Start new JNI local reference state 2490 JNIEnvExt* env = self->GetJniEnv(); 2491 ScopedObjectAccessUnchecked soa(env); 2492 ScopedJniEnvLocalRefState env_state(env); 2493 const char* old_cause = self->StartAssertNoThreadSuspension("Making stack arguments safe."); 2494 2495 // From the instruction, get the |callsite_shorty| and expose arguments on the stack to the GC. 2496 ArtMethod* caller_method = QuickArgumentVisitor::GetCallingMethod(sp); 2497 uint32_t dex_pc = QuickArgumentVisitor::GetCallingDexPc(sp); 2498 const DexFile::CodeItem* code = caller_method->GetCodeItem(); 2499 const Instruction* inst = Instruction::At(&code->insns_[dex_pc]); 2500 DCHECK(inst->Opcode() == Instruction::INVOKE_POLYMORPHIC || 2501 inst->Opcode() == Instruction::INVOKE_POLYMORPHIC_RANGE); 2502 const DexFile* dex_file = caller_method->GetDexFile(); 2503 const uint32_t proto_idx = inst->VRegH(); 2504 const char* shorty = dex_file->GetShorty(proto_idx); 2505 const size_t shorty_length = strlen(shorty); 2506 static const bool kMethodIsStatic = false; // invoke() and invokeExact() are not static. 2507 RememberForGcArgumentVisitor gc_visitor(sp, kMethodIsStatic, shorty, shorty_length, &soa); 2508 gc_visitor.VisitArguments(); 2509 2510 // Wrap raw_method_handle in a Handle for safety. 2511 StackHandleScope<5> hs(self); 2512 Handle<mirror::MethodHandle> method_handle( 2513 hs.NewHandle(ObjPtr<mirror::MethodHandle>::DownCast(MakeObjPtr(raw_method_handle)))); 2514 raw_method_handle = nullptr; 2515 self->EndAssertNoThreadSuspension(old_cause); 2516 2517 // Resolve method - it's either MethodHandle.invoke() or MethodHandle.invokeExact(). 2518 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2519 ArtMethod* resolved_method = linker->ResolveMethod<ClassLinker::kForceICCECheck>(self, 2520 inst->VRegB(), 2521 caller_method, 2522 kVirtual); 2523 DCHECK((resolved_method == 2524 jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandle_invokeExact)) || 2525 (resolved_method == 2526 jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandle_invoke))); 2527 if (UNLIKELY(method_handle.IsNull())) { 2528 ThrowNullPointerExceptionForMethodAccess(resolved_method, InvokeType::kVirtual); 2529 return static_cast<uintptr_t>('V'); 2530 } 2531 2532 Handle<mirror::Class> caller_class(hs.NewHandle(caller_method->GetDeclaringClass())); 2533 Handle<mirror::MethodType> method_type(hs.NewHandle(linker->ResolveMethodType( 2534 *dex_file, proto_idx, 2535 hs.NewHandle<mirror::DexCache>(caller_class->GetDexCache()), 2536 hs.NewHandle<mirror::ClassLoader>(caller_class->GetClassLoader())))); 2537 // This implies we couldn't resolve one or more types in this method handle. 2538 if (UNLIKELY(method_type.IsNull())) { 2539 CHECK(self->IsExceptionPending()); 2540 return static_cast<uintptr_t>('V'); 2541 } 2542 2543 DCHECK_EQ(ArtMethod::NumArgRegisters(shorty) + 1u, (uint32_t)inst->VRegA()); 2544 DCHECK_EQ(resolved_method->IsStatic(), kMethodIsStatic); 2545 2546 // Fix references before constructing the shadow frame. 2547 gc_visitor.FixupReferences(); 2548 2549 // Construct shadow frame placing arguments consecutively from |first_arg|. 2550 const bool is_range = (inst->Opcode() == Instruction::INVOKE_POLYMORPHIC_RANGE); 2551 const size_t num_vregs = is_range ? inst->VRegA_4rcc() : inst->VRegA_45cc(); 2552 const size_t first_arg = 0; 2553 ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = 2554 CREATE_SHADOW_FRAME(num_vregs, /* link */ nullptr, resolved_method, dex_pc); 2555 ShadowFrame* shadow_frame = shadow_frame_unique_ptr.get(); 2556 ScopedStackedShadowFramePusher 2557 frame_pusher(self, shadow_frame, StackedShadowFrameType::kShadowFrameUnderConstruction); 2558 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, 2559 kMethodIsStatic, 2560 shorty, 2561 strlen(shorty), 2562 shadow_frame, 2563 first_arg); 2564 shadow_frame_builder.VisitArguments(); 2565 2566 // Push a transition back into managed code onto the linked list in thread. 2567 ManagedStack fragment; 2568 self->PushManagedStackFragment(&fragment); 2569 2570 // Call DoInvokePolymorphic with |is_range| = true, as shadow frame has argument registers in 2571 // consecutive order. 2572 uint32_t unused_args[Instruction::kMaxVarArgRegs] = {}; 2573 uint32_t first_callee_arg = first_arg + 1; 2574 if (!DoInvokePolymorphic<true /* is_range */>(self, 2575 resolved_method, 2576 *shadow_frame, 2577 method_handle, 2578 method_type, 2579 unused_args, 2580 first_callee_arg, 2581 result)) { 2582 DCHECK(self->IsExceptionPending()); 2583 } 2584 2585 // Pop transition record. 2586 self->PopManagedStackFragment(fragment); 2587 2588 return static_cast<uintptr_t>(shorty[0]); 2589 } 2590 2591 } // namespace art 2592
