quick_trampoline_entrypoints.cc revision e7732be2390f00b1f98b8c0066a37892ee1126f6
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/callee_save_type.h" 19#include "base/enums.h" 20#include "callee_save_frame.h" 21#include "common_throws.h" 22#include "debugger.h" 23#include "dex_file-inl.h" 24#include "dex_file_types.h" 25#include "dex_instruction-inl.h" 26#include "entrypoints/entrypoint_utils-inl.h" 27#include "entrypoints/runtime_asm_entrypoints.h" 28#include "gc/accounting/card_table-inl.h" 29#include "imt_conflict_table.h" 30#include "imtable-inl.h" 31#include "instrumentation.h" 32#include "interpreter/interpreter.h" 33#include "linear_alloc.h" 34#include "method_bss_mapping.h" 35#include "method_handles.h" 36#include "method_reference.h" 37#include "mirror/class-inl.h" 38#include "mirror/dex_cache-inl.h" 39#include "mirror/method.h" 40#include "mirror/method_handle_impl.h" 41#include "mirror/object-inl.h" 42#include "mirror/object_array-inl.h" 43#include "oat_file.h" 44#include "oat_quick_method_header.h" 45#include "quick_exception_handler.h" 46#include "runtime.h" 47#include "scoped_thread_state_change-inl.h" 48#include "stack.h" 49#include "thread-inl.h" 50#include "well_known_classes.h" 51 52namespace art { 53 54// Visits the arguments as saved to the stack by a CalleeSaveType::kRefAndArgs callee save frame. 55class QuickArgumentVisitor { 56 // Number of bytes for each out register in the caller method's frame. 57 static constexpr size_t kBytesStackArgLocation = 4; 58 // Frame size in bytes of a callee-save frame for RefsAndArgs. 59 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 60 GetCalleeSaveFrameSize(kRuntimeISA, CalleeSaveType::kSaveRefsAndArgs); 61#if defined(__arm__) 62 // The callee save frame is pointed to by SP. 63 // | argN | | 64 // | ... | | 65 // | arg4 | | 66 // | arg3 spill | | Caller's frame 67 // | arg2 spill | | 68 // | arg1 spill | | 69 // | Method* | --- 70 // | LR | 71 // | ... | 4x6 bytes callee saves 72 // | R3 | 73 // | R2 | 74 // | R1 | 75 // | S15 | 76 // | : | 77 // | S0 | 78 // | | 4x2 bytes padding 79 // | Method* | <- sp 80 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 81 static constexpr bool kAlignPairRegister = true; 82 static constexpr bool kQuickSoftFloatAbi = false; 83 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = true; 84 static constexpr bool kQuickSkipOddFpRegisters = false; 85 static constexpr size_t kNumQuickGprArgs = 3; 86 static constexpr size_t kNumQuickFprArgs = 16; 87 static constexpr bool kGprFprLockstep = false; 88 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 89 arm::ArmCalleeSaveFpr1Offset(CalleeSaveType::kSaveRefsAndArgs); // Offset of first FPR arg. 90 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 91 arm::ArmCalleeSaveGpr1Offset(CalleeSaveType::kSaveRefsAndArgs); // Offset of first GPR arg. 92 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 93 arm::ArmCalleeSaveLrOffset(CalleeSaveType::kSaveRefsAndArgs); // Offset of return address. 94 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 95 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 96 } 97#elif defined(__aarch64__) 98 // The callee save frame is pointed to by SP. 99 // | argN | | 100 // | ... | | 101 // | arg4 | | 102 // | arg3 spill | | Caller's frame 103 // | arg2 spill | | 104 // | arg1 spill | | 105 // | Method* | --- 106 // | LR | 107 // | X29 | 108 // | : | 109 // | X20 | 110 // | X7 | 111 // | : | 112 // | X1 | 113 // | D7 | 114 // | : | 115 // | D0 | 116 // | | padding 117 // | Method* | <- sp 118 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 119 static constexpr bool kAlignPairRegister = false; 120 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 121 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 122 static constexpr bool kQuickSkipOddFpRegisters = false; 123 static constexpr size_t kNumQuickGprArgs = 7; // 7 arguments passed in GPRs. 124 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 125 static constexpr bool kGprFprLockstep = false; 126 // Offset of first FPR arg. 127 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 128 arm64::Arm64CalleeSaveFpr1Offset(CalleeSaveType::kSaveRefsAndArgs); 129 // Offset of first GPR arg. 130 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 131 arm64::Arm64CalleeSaveGpr1Offset(CalleeSaveType::kSaveRefsAndArgs); 132 // Offset of return address. 133 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 134 arm64::Arm64CalleeSaveLrOffset(CalleeSaveType::kSaveRefsAndArgs); 135 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 136 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 137 } 138#elif defined(__mips__) && !defined(__LP64__) 139 // The callee save frame is pointed to by SP. 140 // | argN | | 141 // | ... | | 142 // | arg4 | | 143 // | arg3 spill | | Caller's frame 144 // | arg2 spill | | 145 // | arg1 spill | | 146 // | Method* | --- 147 // | RA | 148 // | ... | callee saves 149 // | T1 | arg5 150 // | T0 | arg4 151 // | A3 | arg3 152 // | A2 | arg2 153 // | A1 | arg1 154 // | F19 | 155 // | F18 | f_arg5 156 // | F17 | 157 // | F16 | f_arg4 158 // | F15 | 159 // | F14 | f_arg3 160 // | F13 | 161 // | F12 | f_arg2 162 // | F11 | 163 // | F10 | f_arg1 164 // | F9 | 165 // | F8 | f_arg0 166 // | | padding 167 // | A0/Method* | <- sp 168 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 169 static constexpr bool kAlignPairRegister = true; 170 static constexpr bool kQuickSoftFloatAbi = false; 171 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 172 static constexpr bool kQuickSkipOddFpRegisters = true; 173 static constexpr size_t kNumQuickGprArgs = 5; // 5 arguments passed in GPRs. 174 static constexpr size_t kNumQuickFprArgs = 12; // 6 arguments passed in FPRs. Floats can be 175 // passed only in even numbered registers and each 176 // double occupies two registers. 177 static constexpr bool kGprFprLockstep = false; 178 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 8; // Offset of first FPR arg. 179 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 56; // Offset of first GPR arg. 180 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 108; // Offset of return address. 181 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 182 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 183 } 184#elif defined(__mips__) && defined(__LP64__) 185 // The callee save frame is pointed to by SP. 186 // | argN | | 187 // | ... | | 188 // | arg4 | | 189 // | arg3 spill | | Caller's frame 190 // | arg2 spill | | 191 // | arg1 spill | | 192 // | Method* | --- 193 // | RA | 194 // | ... | callee saves 195 // | A7 | arg7 196 // | A6 | arg6 197 // | A5 | arg5 198 // | A4 | arg4 199 // | A3 | arg3 200 // | A2 | arg2 201 // | A1 | arg1 202 // | F19 | f_arg7 203 // | F18 | f_arg6 204 // | F17 | f_arg5 205 // | F16 | f_arg4 206 // | F15 | f_arg3 207 // | F14 | f_arg2 208 // | F13 | f_arg1 209 // | F12 | f_arg0 210 // | | padding 211 // | A0/Method* | <- sp 212 // NOTE: for Mip64, when A0 is skipped, F12 is also skipped. 213 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 214 static constexpr bool kAlignPairRegister = false; 215 static constexpr bool kQuickSoftFloatAbi = false; 216 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 217 static constexpr bool kQuickSkipOddFpRegisters = false; 218 static constexpr size_t kNumQuickGprArgs = 7; // 7 arguments passed in GPRs. 219 static constexpr size_t kNumQuickFprArgs = 7; // 7 arguments passed in FPRs. 220 static constexpr bool kGprFprLockstep = true; 221 222 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 24; // Offset of first FPR arg (F13). 223 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 80; // Offset of first GPR arg (A1). 224 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 200; // Offset of return address. 225 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 226 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 227 } 228#elif defined(__i386__) 229 // The callee save frame is pointed to by SP. 230 // | argN | | 231 // | ... | | 232 // | arg4 | | 233 // | arg3 spill | | Caller's frame 234 // | arg2 spill | | 235 // | arg1 spill | | 236 // | Method* | --- 237 // | Return | 238 // | EBP,ESI,EDI | callee saves 239 // | EBX | arg3 240 // | EDX | arg2 241 // | ECX | arg1 242 // | XMM3 | float arg 4 243 // | XMM2 | float arg 3 244 // | XMM1 | float arg 2 245 // | XMM0 | float arg 1 246 // | EAX/Method* | <- sp 247 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 248 static constexpr bool kAlignPairRegister = false; 249 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 250 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 251 static constexpr bool kQuickSkipOddFpRegisters = false; 252 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 253 static constexpr size_t kNumQuickFprArgs = 4; // 4 arguments passed in FPRs. 254 static constexpr bool kGprFprLockstep = false; 255 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 4; // Offset of first FPR arg. 256 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4 + 4*8; // Offset of first GPR arg. 257 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 28 + 4*8; // Offset of return address. 258 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 259 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 260 } 261#elif defined(__x86_64__) 262 // The callee save frame is pointed to by SP. 263 // | argN | | 264 // | ... | | 265 // | reg. arg spills | | Caller's frame 266 // | Method* | --- 267 // | Return | 268 // | R15 | callee save 269 // | R14 | callee save 270 // | R13 | callee save 271 // | R12 | callee save 272 // | R9 | arg5 273 // | R8 | arg4 274 // | RSI/R6 | arg1 275 // | RBP/R5 | callee save 276 // | RBX/R3 | callee save 277 // | RDX/R2 | arg2 278 // | RCX/R1 | arg3 279 // | XMM7 | float arg 8 280 // | XMM6 | float arg 7 281 // | XMM5 | float arg 6 282 // | XMM4 | float arg 5 283 // | XMM3 | float arg 4 284 // | XMM2 | float arg 3 285 // | XMM1 | float arg 2 286 // | XMM0 | float arg 1 287 // | Padding | 288 // | RDI/Method* | <- sp 289 static constexpr bool kSplitPairAcrossRegisterAndStack = false; 290 static constexpr bool kAlignPairRegister = false; 291 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 292 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 293 static constexpr bool kQuickSkipOddFpRegisters = false; 294 static constexpr size_t kNumQuickGprArgs = 5; // 5 arguments passed in GPRs. 295 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 296 static constexpr bool kGprFprLockstep = false; 297 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 16; // Offset of first FPR arg. 298 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 80 + 4*8; // Offset of first GPR arg. 299 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 168 + 4*8; // Offset of return address. 300 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 301 switch (gpr_index) { 302 case 0: return (4 * GetBytesPerGprSpillLocation(kRuntimeISA)); 303 case 1: return (1 * GetBytesPerGprSpillLocation(kRuntimeISA)); 304 case 2: return (0 * GetBytesPerGprSpillLocation(kRuntimeISA)); 305 case 3: return (5 * GetBytesPerGprSpillLocation(kRuntimeISA)); 306 case 4: return (6 * GetBytesPerGprSpillLocation(kRuntimeISA)); 307 default: 308 LOG(FATAL) << "Unexpected GPR index: " << gpr_index; 309 return 0; 310 } 311 } 312#else 313#error "Unsupported architecture" 314#endif 315 316 public: 317 // Special handling for proxy methods. Proxy methods are instance methods so the 318 // 'this' object is the 1st argument. They also have the same frame layout as the 319 // kRefAndArgs runtime method. Since 'this' is a reference, it is located in the 320 // 1st GPR. 321 static mirror::Object* GetProxyThisObject(ArtMethod** sp) 322 REQUIRES_SHARED(Locks::mutator_lock_) { 323 CHECK((*sp)->IsProxyMethod()); 324 CHECK_GT(kNumQuickGprArgs, 0u); 325 constexpr uint32_t kThisGprIndex = 0u; // 'this' is in the 1st GPR. 326 size_t this_arg_offset = kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset + 327 GprIndexToGprOffset(kThisGprIndex); 328 uint8_t* this_arg_address = reinterpret_cast<uint8_t*>(sp) + this_arg_offset; 329 return reinterpret_cast<StackReference<mirror::Object>*>(this_arg_address)->AsMirrorPtr(); 330 } 331 332 static ArtMethod* GetCallingMethod(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 333 DCHECK((*sp)->IsCalleeSaveMethod()); 334 return GetCalleeSaveMethodCaller(sp, CalleeSaveType::kSaveRefsAndArgs); 335 } 336 337 static ArtMethod* GetOuterMethod(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 338 DCHECK((*sp)->IsCalleeSaveMethod()); 339 uint8_t* previous_sp = 340 reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize; 341 return *reinterpret_cast<ArtMethod**>(previous_sp); 342 } 343 344 static uint32_t GetCallingDexPc(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 345 DCHECK((*sp)->IsCalleeSaveMethod()); 346 const size_t callee_frame_size = GetCalleeSaveFrameSize(kRuntimeISA, 347 CalleeSaveType::kSaveRefsAndArgs); 348 ArtMethod** caller_sp = reinterpret_cast<ArtMethod**>( 349 reinterpret_cast<uintptr_t>(sp) + callee_frame_size); 350 uintptr_t outer_pc = QuickArgumentVisitor::GetCallingPc(sp); 351 const OatQuickMethodHeader* current_code = (*caller_sp)->GetOatQuickMethodHeader(outer_pc); 352 uintptr_t outer_pc_offset = current_code->NativeQuickPcOffset(outer_pc); 353 354 if (current_code->IsOptimized()) { 355 CodeInfo code_info = current_code->GetOptimizedCodeInfo(); 356 CodeInfoEncoding encoding = code_info.ExtractEncoding(); 357 StackMap stack_map = code_info.GetStackMapForNativePcOffset(outer_pc_offset, encoding); 358 DCHECK(stack_map.IsValid()); 359 if (stack_map.HasInlineInfo(encoding.stack_map.encoding)) { 360 InlineInfo inline_info = code_info.GetInlineInfoOf(stack_map, encoding); 361 return inline_info.GetDexPcAtDepth(encoding.inline_info.encoding, 362 inline_info.GetDepth(encoding.inline_info.encoding)-1); 363 } else { 364 return stack_map.GetDexPc(encoding.stack_map.encoding); 365 } 366 } else { 367 return current_code->ToDexPc(*caller_sp, outer_pc); 368 } 369 } 370 371 static bool GetInvokeType(ArtMethod** sp, InvokeType* invoke_type, uint32_t* dex_method_index) 372 REQUIRES_SHARED(Locks::mutator_lock_) { 373 DCHECK((*sp)->IsCalleeSaveMethod()); 374 const size_t callee_frame_size = GetCalleeSaveFrameSize(kRuntimeISA, 375 CalleeSaveType::kSaveRefsAndArgs); 376 ArtMethod** caller_sp = reinterpret_cast<ArtMethod**>( 377 reinterpret_cast<uintptr_t>(sp) + callee_frame_size); 378 uintptr_t outer_pc = QuickArgumentVisitor::GetCallingPc(sp); 379 const OatQuickMethodHeader* current_code = (*caller_sp)->GetOatQuickMethodHeader(outer_pc); 380 if (!current_code->IsOptimized()) { 381 return false; 382 } 383 uintptr_t outer_pc_offset = current_code->NativeQuickPcOffset(outer_pc); 384 CodeInfo code_info = current_code->GetOptimizedCodeInfo(); 385 CodeInfoEncoding encoding = code_info.ExtractEncoding(); 386 MethodInfo method_info = current_code->GetOptimizedMethodInfo(); 387 InvokeInfo invoke(code_info.GetInvokeInfoForNativePcOffset(outer_pc_offset, encoding)); 388 if (invoke.IsValid()) { 389 *invoke_type = static_cast<InvokeType>(invoke.GetInvokeType(encoding.invoke_info.encoding)); 390 *dex_method_index = invoke.GetMethodIndex(encoding.invoke_info.encoding, method_info); 391 return true; 392 } 393 return false; 394 } 395 396 // For the given quick ref and args quick frame, return the caller's PC. 397 static uintptr_t GetCallingPc(ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 398 DCHECK((*sp)->IsCalleeSaveMethod()); 399 uint8_t* lr = reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_LrOffset; 400 return *reinterpret_cast<uintptr_t*>(lr); 401 } 402 403 QuickArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, 404 uint32_t shorty_len) REQUIRES_SHARED(Locks::mutator_lock_) : 405 is_static_(is_static), shorty_(shorty), shorty_len_(shorty_len), 406 gpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset), 407 fpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset), 408 stack_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize 409 + sizeof(ArtMethod*)), // Skip ArtMethod*. 410 gpr_index_(0), fpr_index_(0), fpr_double_index_(0), stack_index_(0), 411 cur_type_(Primitive::kPrimVoid), is_split_long_or_double_(false) { 412 static_assert(kQuickSoftFloatAbi == (kNumQuickFprArgs == 0), 413 "Number of Quick FPR arguments unexpected"); 414 static_assert(!(kQuickSoftFloatAbi && kQuickDoubleRegAlignedFloatBackFilled), 415 "Double alignment unexpected"); 416 // For register alignment, we want to assume that counters(fpr_double_index_) are even if the 417 // next register is even. 418 static_assert(!kQuickDoubleRegAlignedFloatBackFilled || kNumQuickFprArgs % 2 == 0, 419 "Number of Quick FPR arguments not even"); 420 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 421 } 422 423 virtual ~QuickArgumentVisitor() {} 424 425 virtual void Visit() = 0; 426 427 Primitive::Type GetParamPrimitiveType() const { 428 return cur_type_; 429 } 430 431 uint8_t* GetParamAddress() const { 432 if (!kQuickSoftFloatAbi) { 433 Primitive::Type type = GetParamPrimitiveType(); 434 if (UNLIKELY((type == Primitive::kPrimDouble) || (type == Primitive::kPrimFloat))) { 435 if (type == Primitive::kPrimDouble && kQuickDoubleRegAlignedFloatBackFilled) { 436 if (fpr_double_index_ + 2 < kNumQuickFprArgs + 1) { 437 return fpr_args_ + (fpr_double_index_ * GetBytesPerFprSpillLocation(kRuntimeISA)); 438 } 439 } else if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 440 return fpr_args_ + (fpr_index_ * GetBytesPerFprSpillLocation(kRuntimeISA)); 441 } 442 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 443 } 444 } 445 if (gpr_index_ < kNumQuickGprArgs) { 446 return gpr_args_ + GprIndexToGprOffset(gpr_index_); 447 } 448 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 449 } 450 451 bool IsSplitLongOrDouble() const { 452 if ((GetBytesPerGprSpillLocation(kRuntimeISA) == 4) || 453 (GetBytesPerFprSpillLocation(kRuntimeISA) == 4)) { 454 return is_split_long_or_double_; 455 } else { 456 return false; // An optimization for when GPR and FPRs are 64bit. 457 } 458 } 459 460 bool IsParamAReference() const { 461 return GetParamPrimitiveType() == Primitive::kPrimNot; 462 } 463 464 bool IsParamALongOrDouble() const { 465 Primitive::Type type = GetParamPrimitiveType(); 466 return type == Primitive::kPrimLong || type == Primitive::kPrimDouble; 467 } 468 469 uint64_t ReadSplitLongParam() const { 470 // The splitted long is always available through the stack. 471 return *reinterpret_cast<uint64_t*>(stack_args_ 472 + stack_index_ * kBytesStackArgLocation); 473 } 474 475 void IncGprIndex() { 476 gpr_index_++; 477 if (kGprFprLockstep) { 478 fpr_index_++; 479 } 480 } 481 482 void IncFprIndex() { 483 fpr_index_++; 484 if (kGprFprLockstep) { 485 gpr_index_++; 486 } 487 } 488 489 void VisitArguments() REQUIRES_SHARED(Locks::mutator_lock_) { 490 // (a) 'stack_args_' should point to the first method's argument 491 // (b) whatever the argument type it is, the 'stack_index_' should 492 // be moved forward along with every visiting. 493 gpr_index_ = 0; 494 fpr_index_ = 0; 495 if (kQuickDoubleRegAlignedFloatBackFilled) { 496 fpr_double_index_ = 0; 497 } 498 stack_index_ = 0; 499 if (!is_static_) { // Handle this. 500 cur_type_ = Primitive::kPrimNot; 501 is_split_long_or_double_ = false; 502 Visit(); 503 stack_index_++; 504 if (kNumQuickGprArgs > 0) { 505 IncGprIndex(); 506 } 507 } 508 for (uint32_t shorty_index = 1; shorty_index < shorty_len_; ++shorty_index) { 509 cur_type_ = Primitive::GetType(shorty_[shorty_index]); 510 switch (cur_type_) { 511 case Primitive::kPrimNot: 512 case Primitive::kPrimBoolean: 513 case Primitive::kPrimByte: 514 case Primitive::kPrimChar: 515 case Primitive::kPrimShort: 516 case Primitive::kPrimInt: 517 is_split_long_or_double_ = false; 518 Visit(); 519 stack_index_++; 520 if (gpr_index_ < kNumQuickGprArgs) { 521 IncGprIndex(); 522 } 523 break; 524 case Primitive::kPrimFloat: 525 is_split_long_or_double_ = false; 526 Visit(); 527 stack_index_++; 528 if (kQuickSoftFloatAbi) { 529 if (gpr_index_ < kNumQuickGprArgs) { 530 IncGprIndex(); 531 } 532 } else { 533 if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 534 IncFprIndex(); 535 if (kQuickDoubleRegAlignedFloatBackFilled) { 536 // Double should not overlap with float. 537 // For example, if fpr_index_ = 3, fpr_double_index_ should be at least 4. 538 fpr_double_index_ = std::max(fpr_double_index_, RoundUp(fpr_index_, 2)); 539 // Float should not overlap with double. 540 if (fpr_index_ % 2 == 0) { 541 fpr_index_ = std::max(fpr_double_index_, fpr_index_); 542 } 543 } else if (kQuickSkipOddFpRegisters) { 544 IncFprIndex(); 545 } 546 } 547 } 548 break; 549 case Primitive::kPrimDouble: 550 case Primitive::kPrimLong: 551 if (kQuickSoftFloatAbi || (cur_type_ == Primitive::kPrimLong)) { 552 if (cur_type_ == Primitive::kPrimLong && 553#if defined(__mips__) && !defined(__LP64__) 554 (gpr_index_ == 0 || gpr_index_ == 2) && 555#else 556 gpr_index_ == 0 && 557#endif 558 kAlignPairRegister) { 559 // Currently, this is only for ARM and MIPS, where we align long parameters with 560 // even-numbered registers by skipping R1 (on ARM) or A1(A3) (on MIPS) and using 561 // R2 (on ARM) or A2(T0) (on MIPS) instead. 562 IncGprIndex(); 563 } 564 is_split_long_or_double_ = (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) && 565 ((gpr_index_ + 1) == kNumQuickGprArgs); 566 if (!kSplitPairAcrossRegisterAndStack && is_split_long_or_double_) { 567 // We don't want to split this. Pass over this register. 568 gpr_index_++; 569 is_split_long_or_double_ = false; 570 } 571 Visit(); 572 if (kBytesStackArgLocation == 4) { 573 stack_index_+= 2; 574 } else { 575 CHECK_EQ(kBytesStackArgLocation, 8U); 576 stack_index_++; 577 } 578 if (gpr_index_ < kNumQuickGprArgs) { 579 IncGprIndex(); 580 if (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) { 581 if (gpr_index_ < kNumQuickGprArgs) { 582 IncGprIndex(); 583 } 584 } 585 } 586 } else { 587 is_split_long_or_double_ = (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) && 588 ((fpr_index_ + 1) == kNumQuickFprArgs) && !kQuickDoubleRegAlignedFloatBackFilled; 589 Visit(); 590 if (kBytesStackArgLocation == 4) { 591 stack_index_+= 2; 592 } else { 593 CHECK_EQ(kBytesStackArgLocation, 8U); 594 stack_index_++; 595 } 596 if (kQuickDoubleRegAlignedFloatBackFilled) { 597 if (fpr_double_index_ + 2 < kNumQuickFprArgs + 1) { 598 fpr_double_index_ += 2; 599 // Float should not overlap with double. 600 if (fpr_index_ % 2 == 0) { 601 fpr_index_ = std::max(fpr_double_index_, fpr_index_); 602 } 603 } 604 } else if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 605 IncFprIndex(); 606 if (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) { 607 if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 608 IncFprIndex(); 609 } 610 } 611 } 612 } 613 break; 614 default: 615 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty_; 616 } 617 } 618 } 619 620 protected: 621 const bool is_static_; 622 const char* const shorty_; 623 const uint32_t shorty_len_; 624 625 private: 626 uint8_t* const gpr_args_; // Address of GPR arguments in callee save frame. 627 uint8_t* const fpr_args_; // Address of FPR arguments in callee save frame. 628 uint8_t* const stack_args_; // Address of stack arguments in caller's frame. 629 uint32_t gpr_index_; // Index into spilled GPRs. 630 // Index into spilled FPRs. 631 // In case kQuickDoubleRegAlignedFloatBackFilled, it may index a hole while fpr_double_index_ 632 // holds a higher register number. 633 uint32_t fpr_index_; 634 // Index into spilled FPRs for aligned double. 635 // Only used when kQuickDoubleRegAlignedFloatBackFilled. Next available double register indexed in 636 // terms of singles, may be behind fpr_index. 637 uint32_t fpr_double_index_; 638 uint32_t stack_index_; // Index into arguments on the stack. 639 // The current type of argument during VisitArguments. 640 Primitive::Type cur_type_; 641 // Does a 64bit parameter straddle the register and stack arguments? 642 bool is_split_long_or_double_; 643}; 644 645// Returns the 'this' object of a proxy method. This function is only used by StackVisitor. It 646// allows to use the QuickArgumentVisitor constants without moving all the code in its own module. 647extern "C" mirror::Object* artQuickGetProxyThisObject(ArtMethod** sp) 648 REQUIRES_SHARED(Locks::mutator_lock_) { 649 return QuickArgumentVisitor::GetProxyThisObject(sp); 650} 651 652// Visits arguments on the stack placing them into the shadow frame. 653class BuildQuickShadowFrameVisitor FINAL : public QuickArgumentVisitor { 654 public: 655 BuildQuickShadowFrameVisitor(ArtMethod** sp, bool is_static, const char* shorty, 656 uint32_t shorty_len, ShadowFrame* sf, size_t first_arg_reg) : 657 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), sf_(sf), cur_reg_(first_arg_reg) {} 658 659 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 660 661 private: 662 ShadowFrame* const sf_; 663 uint32_t cur_reg_; 664 665 DISALLOW_COPY_AND_ASSIGN(BuildQuickShadowFrameVisitor); 666}; 667 668void BuildQuickShadowFrameVisitor::Visit() { 669 Primitive::Type type = GetParamPrimitiveType(); 670 switch (type) { 671 case Primitive::kPrimLong: // Fall-through. 672 case Primitive::kPrimDouble: 673 if (IsSplitLongOrDouble()) { 674 sf_->SetVRegLong(cur_reg_, ReadSplitLongParam()); 675 } else { 676 sf_->SetVRegLong(cur_reg_, *reinterpret_cast<jlong*>(GetParamAddress())); 677 } 678 ++cur_reg_; 679 break; 680 case Primitive::kPrimNot: { 681 StackReference<mirror::Object>* stack_ref = 682 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 683 sf_->SetVRegReference(cur_reg_, stack_ref->AsMirrorPtr()); 684 } 685 break; 686 case Primitive::kPrimBoolean: // Fall-through. 687 case Primitive::kPrimByte: // Fall-through. 688 case Primitive::kPrimChar: // Fall-through. 689 case Primitive::kPrimShort: // Fall-through. 690 case Primitive::kPrimInt: // Fall-through. 691 case Primitive::kPrimFloat: 692 sf_->SetVReg(cur_reg_, *reinterpret_cast<jint*>(GetParamAddress())); 693 break; 694 case Primitive::kPrimVoid: 695 LOG(FATAL) << "UNREACHABLE"; 696 UNREACHABLE(); 697 } 698 ++cur_reg_; 699} 700 701// Don't inline. See b/65159206. 702NO_INLINE 703static void HandleDeoptimization(JValue* result, 704 ArtMethod* method, 705 ShadowFrame* deopt_frame, 706 ManagedStack* fragment) 707 REQUIRES_SHARED(Locks::mutator_lock_) { 708 // Coming from partial-fragment deopt. 709 Thread* self = Thread::Current(); 710 if (kIsDebugBuild) { 711 // Sanity-check: are the methods as expected? We check that the last shadow frame (the bottom 712 // of the call-stack) corresponds to the called method. 713 ShadowFrame* linked = deopt_frame; 714 while (linked->GetLink() != nullptr) { 715 linked = linked->GetLink(); 716 } 717 CHECK_EQ(method, linked->GetMethod()) << method->PrettyMethod() << " " 718 << ArtMethod::PrettyMethod(linked->GetMethod()); 719 } 720 721 if (VLOG_IS_ON(deopt)) { 722 // Print out the stack to verify that it was a partial-fragment deopt. 723 LOG(INFO) << "Continue-ing from deopt. Stack is:"; 724 QuickExceptionHandler::DumpFramesWithType(self, true); 725 } 726 727 ObjPtr<mirror::Throwable> pending_exception; 728 bool from_code = false; 729 DeoptimizationMethodType method_type; 730 self->PopDeoptimizationContext(/* out */ result, 731 /* out */ &pending_exception, 732 /* out */ &from_code, 733 /* out */ &method_type); 734 735 // Push a transition back into managed code onto the linked list in thread. 736 self->PushManagedStackFragment(fragment); 737 738 // Ensure that the stack is still in order. 739 if (kIsDebugBuild) { 740 class DummyStackVisitor : public StackVisitor { 741 public: 742 explicit DummyStackVisitor(Thread* self_in) REQUIRES_SHARED(Locks::mutator_lock_) 743 : StackVisitor(self_in, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {} 744 745 bool VisitFrame() OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) { 746 // Nothing to do here. In a debug build, SanityCheckFrame will do the work in the walking 747 // logic. Just always say we want to continue. 748 return true; 749 } 750 }; 751 DummyStackVisitor dsv(self); 752 dsv.WalkStack(); 753 } 754 755 // Restore the exception that was pending before deoptimization then interpret the 756 // deoptimized frames. 757 if (pending_exception != nullptr) { 758 self->SetException(pending_exception); 759 } 760 interpreter::EnterInterpreterFromDeoptimize(self, 761 deopt_frame, 762 result, 763 from_code, 764 DeoptimizationMethodType::kDefault); 765} 766 767extern "C" uint64_t artQuickToInterpreterBridge(ArtMethod* method, Thread* self, ArtMethod** sp) 768 REQUIRES_SHARED(Locks::mutator_lock_) { 769 // Ensure we don't get thread suspension until the object arguments are safely in the shadow 770 // frame. 771 ScopedQuickEntrypointChecks sqec(self); 772 773 if (UNLIKELY(!method->IsInvokable())) { 774 method->ThrowInvocationTimeError(); 775 return 0; 776 } 777 778 JValue tmp_value; 779 ShadowFrame* deopt_frame = self->PopStackedShadowFrame( 780 StackedShadowFrameType::kDeoptimizationShadowFrame, false); 781 ManagedStack fragment; 782 783 DCHECK(!method->IsNative()) << method->PrettyMethod(); 784 uint32_t shorty_len = 0; 785 ArtMethod* non_proxy_method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize); 786 const DexFile::CodeItem* code_item = non_proxy_method->GetCodeItem(); 787 DCHECK(code_item != nullptr) << method->PrettyMethod(); 788 const char* shorty = non_proxy_method->GetShorty(&shorty_len); 789 790 JValue result; 791 792 if (UNLIKELY(deopt_frame != nullptr)) { 793 HandleDeoptimization(&result, method, deopt_frame, &fragment); 794 } else { 795 const char* old_cause = self->StartAssertNoThreadSuspension( 796 "Building interpreter shadow frame"); 797 uint16_t num_regs = code_item->registers_size_; 798 // No last shadow coming from quick. 799 ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = 800 CREATE_SHADOW_FRAME(num_regs, /* link */ nullptr, method, /* dex pc */ 0); 801 ShadowFrame* shadow_frame = shadow_frame_unique_ptr.get(); 802 size_t first_arg_reg = code_item->registers_size_ - code_item->ins_size_; 803 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, method->IsStatic(), shorty, shorty_len, 804 shadow_frame, first_arg_reg); 805 shadow_frame_builder.VisitArguments(); 806 const bool needs_initialization = 807 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 808 // Push a transition back into managed code onto the linked list in thread. 809 self->PushManagedStackFragment(&fragment); 810 self->PushShadowFrame(shadow_frame); 811 self->EndAssertNoThreadSuspension(old_cause); 812 813 if (needs_initialization) { 814 // Ensure static method's class is initialized. 815 StackHandleScope<1> hs(self); 816 Handle<mirror::Class> h_class(hs.NewHandle(shadow_frame->GetMethod()->GetDeclaringClass())); 817 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) { 818 DCHECK(Thread::Current()->IsExceptionPending()) 819 << shadow_frame->GetMethod()->PrettyMethod(); 820 self->PopManagedStackFragment(fragment); 821 return 0; 822 } 823 } 824 825 result = interpreter::EnterInterpreterFromEntryPoint(self, code_item, shadow_frame); 826 } 827 828 // Pop transition. 829 self->PopManagedStackFragment(fragment); 830 831 // Request a stack deoptimization if needed 832 ArtMethod* caller = QuickArgumentVisitor::GetCallingMethod(sp); 833 uintptr_t caller_pc = QuickArgumentVisitor::GetCallingPc(sp); 834 // If caller_pc is the instrumentation exit stub, the stub will check to see if deoptimization 835 // should be done and it knows the real return pc. 836 if (UNLIKELY(caller_pc != reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc()) && 837 Dbg::IsForcedInterpreterNeededForUpcall(self, caller))) { 838 if (!Runtime::Current()->IsAsyncDeoptimizeable(caller_pc)) { 839 LOG(WARNING) << "Got a deoptimization request on un-deoptimizable method " 840 << caller->PrettyMethod(); 841 } else { 842 // Push the context of the deoptimization stack so we can restore the return value and the 843 // exception before executing the deoptimized frames. 844 self->PushDeoptimizationContext( 845 result, 846 shorty[0] == 'L' || shorty[0] == '[', /* class or array */ 847 self->GetException(), 848 false /* from_code */, 849 DeoptimizationMethodType::kDefault); 850 851 // Set special exception to cause deoptimization. 852 self->SetException(Thread::GetDeoptimizationException()); 853 } 854 } 855 856 // No need to restore the args since the method has already been run by the interpreter. 857 return result.GetJ(); 858} 859 860// Visits arguments on the stack placing them into the args vector, Object* arguments are converted 861// to jobjects. 862class BuildQuickArgumentVisitor FINAL : public QuickArgumentVisitor { 863 public: 864 BuildQuickArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, uint32_t shorty_len, 865 ScopedObjectAccessUnchecked* soa, std::vector<jvalue>* args) : 866 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa), args_(args) {} 867 868 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 869 870 void FixupReferences() REQUIRES_SHARED(Locks::mutator_lock_); 871 872 private: 873 ScopedObjectAccessUnchecked* const soa_; 874 std::vector<jvalue>* const args_; 875 // References which we must update when exiting in case the GC moved the objects. 876 std::vector<std::pair<jobject, StackReference<mirror::Object>*>> references_; 877 878 DISALLOW_COPY_AND_ASSIGN(BuildQuickArgumentVisitor); 879}; 880 881void BuildQuickArgumentVisitor::Visit() { 882 jvalue val; 883 Primitive::Type type = GetParamPrimitiveType(); 884 switch (type) { 885 case Primitive::kPrimNot: { 886 StackReference<mirror::Object>* stack_ref = 887 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 888 val.l = soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 889 references_.push_back(std::make_pair(val.l, stack_ref)); 890 break; 891 } 892 case Primitive::kPrimLong: // Fall-through. 893 case Primitive::kPrimDouble: 894 if (IsSplitLongOrDouble()) { 895 val.j = ReadSplitLongParam(); 896 } else { 897 val.j = *reinterpret_cast<jlong*>(GetParamAddress()); 898 } 899 break; 900 case Primitive::kPrimBoolean: // Fall-through. 901 case Primitive::kPrimByte: // Fall-through. 902 case Primitive::kPrimChar: // Fall-through. 903 case Primitive::kPrimShort: // Fall-through. 904 case Primitive::kPrimInt: // Fall-through. 905 case Primitive::kPrimFloat: 906 val.i = *reinterpret_cast<jint*>(GetParamAddress()); 907 break; 908 case Primitive::kPrimVoid: 909 LOG(FATAL) << "UNREACHABLE"; 910 UNREACHABLE(); 911 } 912 args_->push_back(val); 913} 914 915void BuildQuickArgumentVisitor::FixupReferences() { 916 // Fixup any references which may have changed. 917 for (const auto& pair : references_) { 918 pair.second->Assign(soa_->Decode<mirror::Object>(pair.first)); 919 soa_->Env()->DeleteLocalRef(pair.first); 920 } 921} 922// Handler for invocation on proxy methods. On entry a frame will exist for the proxy object method 923// which is responsible for recording callee save registers. We explicitly place into jobjects the 924// incoming reference arguments (so they survive GC). We invoke the invocation handler, which is a 925// field within the proxy object, which will box the primitive arguments and deal with error cases. 926extern "C" uint64_t artQuickProxyInvokeHandler( 927 ArtMethod* proxy_method, mirror::Object* receiver, Thread* self, ArtMethod** sp) 928 REQUIRES_SHARED(Locks::mutator_lock_) { 929 DCHECK(proxy_method->IsProxyMethod()) << proxy_method->PrettyMethod(); 930 DCHECK(receiver->GetClass()->IsProxyClass()) << proxy_method->PrettyMethod(); 931 // Ensure we don't get thread suspension until the object arguments are safely in jobjects. 932 const char* old_cause = 933 self->StartAssertNoThreadSuspension("Adding to IRT proxy object arguments"); 934 // Register the top of the managed stack, making stack crawlable. 935 DCHECK_EQ((*sp), proxy_method) << proxy_method->PrettyMethod(); 936 self->VerifyStack(); 937 // Start new JNI local reference state. 938 JNIEnvExt* env = self->GetJniEnv(); 939 ScopedObjectAccessUnchecked soa(env); 940 ScopedJniEnvLocalRefState env_state(env); 941 // Create local ref. copies of proxy method and the receiver. 942 jobject rcvr_jobj = soa.AddLocalReference<jobject>(receiver); 943 944 // Placing arguments into args vector and remove the receiver. 945 ArtMethod* non_proxy_method = proxy_method->GetInterfaceMethodIfProxy(kRuntimePointerSize); 946 CHECK(!non_proxy_method->IsStatic()) << proxy_method->PrettyMethod() << " " 947 << non_proxy_method->PrettyMethod(); 948 std::vector<jvalue> args; 949 uint32_t shorty_len = 0; 950 const char* shorty = non_proxy_method->GetShorty(&shorty_len); 951 BuildQuickArgumentVisitor local_ref_visitor(sp, false, shorty, shorty_len, &soa, &args); 952 953 local_ref_visitor.VisitArguments(); 954 DCHECK_GT(args.size(), 0U) << proxy_method->PrettyMethod(); 955 args.erase(args.begin()); 956 957 // Convert proxy method into expected interface method. 958 ArtMethod* interface_method = proxy_method->FindOverriddenMethod(kRuntimePointerSize); 959 DCHECK(interface_method != nullptr) << proxy_method->PrettyMethod(); 960 DCHECK(!interface_method->IsProxyMethod()) << interface_method->PrettyMethod(); 961 self->EndAssertNoThreadSuspension(old_cause); 962 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 963 DCHECK(!Runtime::Current()->IsActiveTransaction()); 964 jobject interface_method_jobj = soa.AddLocalReference<jobject>( 965 mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), 966 interface_method)); 967 968 // All naked Object*s should now be in jobjects, so its safe to go into the main invoke code 969 // that performs allocations. 970 JValue result = InvokeProxyInvocationHandler(soa, shorty, rcvr_jobj, interface_method_jobj, args); 971 // Restore references which might have moved. 972 local_ref_visitor.FixupReferences(); 973 return result.GetJ(); 974} 975 976// Read object references held in arguments from quick frames and place in a JNI local references, 977// so they don't get garbage collected. 978class RememberForGcArgumentVisitor FINAL : public QuickArgumentVisitor { 979 public: 980 RememberForGcArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, 981 uint32_t shorty_len, ScopedObjectAccessUnchecked* soa) : 982 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa) {} 983 984 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 985 986 void FixupReferences() REQUIRES_SHARED(Locks::mutator_lock_); 987 988 private: 989 ScopedObjectAccessUnchecked* const soa_; 990 // References which we must update when exiting in case the GC moved the objects. 991 std::vector<std::pair<jobject, StackReference<mirror::Object>*> > references_; 992 993 DISALLOW_COPY_AND_ASSIGN(RememberForGcArgumentVisitor); 994}; 995 996void RememberForGcArgumentVisitor::Visit() { 997 if (IsParamAReference()) { 998 StackReference<mirror::Object>* stack_ref = 999 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 1000 jobject reference = 1001 soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 1002 references_.push_back(std::make_pair(reference, stack_ref)); 1003 } 1004} 1005 1006void RememberForGcArgumentVisitor::FixupReferences() { 1007 // Fixup any references which may have changed. 1008 for (const auto& pair : references_) { 1009 pair.second->Assign(soa_->Decode<mirror::Object>(pair.first)); 1010 soa_->Env()->DeleteLocalRef(pair.first); 1011 } 1012} 1013 1014extern "C" const void* artInstrumentationMethodEntryFromCode(ArtMethod* method, 1015 mirror::Object* this_object, 1016 Thread* self, 1017 ArtMethod** sp) 1018 REQUIRES_SHARED(Locks::mutator_lock_) { 1019 const void* result; 1020 // Instrumentation changes the stack. Thus, when exiting, the stack cannot be verified, so skip 1021 // that part. 1022 ScopedQuickEntrypointChecks sqec(self, kIsDebugBuild, false); 1023 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 1024 if (instrumentation->IsDeoptimized(method)) { 1025 result = GetQuickToInterpreterBridge(); 1026 } else { 1027 result = instrumentation->GetQuickCodeFor(method, kRuntimePointerSize); 1028 DCHECK(!Runtime::Current()->GetClassLinker()->IsQuickToInterpreterBridge(result)); 1029 } 1030 1031 bool interpreter_entry = (result == GetQuickToInterpreterBridge()); 1032 bool is_static = method->IsStatic(); 1033 uint32_t shorty_len; 1034 const char* shorty = 1035 method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len); 1036 1037 ScopedObjectAccessUnchecked soa(self); 1038 RememberForGcArgumentVisitor visitor(sp, is_static, shorty, shorty_len, &soa); 1039 visitor.VisitArguments(); 1040 1041 instrumentation->PushInstrumentationStackFrame(self, 1042 is_static ? nullptr : this_object, 1043 method, 1044 QuickArgumentVisitor::GetCallingPc(sp), 1045 interpreter_entry); 1046 1047 visitor.FixupReferences(); 1048 if (UNLIKELY(self->IsExceptionPending())) { 1049 return nullptr; 1050 } 1051 CHECK(result != nullptr) << method->PrettyMethod(); 1052 return result; 1053} 1054 1055extern "C" TwoWordReturn artInstrumentationMethodExitFromCode(Thread* self, 1056 ArtMethod** sp, 1057 uint64_t* gpr_result, 1058 uint64_t* fpr_result) 1059 REQUIRES_SHARED(Locks::mutator_lock_) { 1060 DCHECK_EQ(reinterpret_cast<uintptr_t>(self), reinterpret_cast<uintptr_t>(Thread::Current())); 1061 CHECK(gpr_result != nullptr); 1062 CHECK(fpr_result != nullptr); 1063 // Instrumentation exit stub must not be entered with a pending exception. 1064 CHECK(!self->IsExceptionPending()) << "Enter instrumentation exit stub with pending exception " 1065 << self->GetException()->Dump(); 1066 // Compute address of return PC and sanity check that it currently holds 0. 1067 size_t return_pc_offset = GetCalleeSaveReturnPcOffset(kRuntimeISA, 1068 CalleeSaveType::kSaveEverything); 1069 uintptr_t* return_pc = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(sp) + 1070 return_pc_offset); 1071 CHECK_EQ(*return_pc, 0U); 1072 1073 // Pop the frame filling in the return pc. The low half of the return value is 0 when 1074 // deoptimization shouldn't be performed with the high-half having the return address. When 1075 // deoptimization should be performed the low half is zero and the high-half the address of the 1076 // deoptimization entry point. 1077 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 1078 TwoWordReturn return_or_deoptimize_pc = instrumentation->PopInstrumentationStackFrame( 1079 self, return_pc, gpr_result, fpr_result); 1080 if (self->IsExceptionPending()) { 1081 return GetTwoWordFailureValue(); 1082 } 1083 return return_or_deoptimize_pc; 1084} 1085 1086// Lazily resolve a method for quick. Called by stub code. 1087extern "C" const void* artQuickResolutionTrampoline( 1088 ArtMethod* called, mirror::Object* receiver, Thread* self, ArtMethod** sp) 1089 REQUIRES_SHARED(Locks::mutator_lock_) { 1090 // The resolution trampoline stashes the resolved method into the callee-save frame to transport 1091 // it. Thus, when exiting, the stack cannot be verified (as the resolved method most likely 1092 // does not have the same stack layout as the callee-save method). 1093 ScopedQuickEntrypointChecks sqec(self, kIsDebugBuild, false); 1094 // Start new JNI local reference state 1095 JNIEnvExt* env = self->GetJniEnv(); 1096 ScopedObjectAccessUnchecked soa(env); 1097 ScopedJniEnvLocalRefState env_state(env); 1098 const char* old_cause = self->StartAssertNoThreadSuspension("Quick method resolution set up"); 1099 1100 // Compute details about the called method (avoid GCs) 1101 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 1102 InvokeType invoke_type; 1103 MethodReference called_method(nullptr, 0); 1104 const bool called_method_known_on_entry = !called->IsRuntimeMethod(); 1105 ArtMethod* caller = nullptr; 1106 if (!called_method_known_on_entry) { 1107 caller = QuickArgumentVisitor::GetCallingMethod(sp); 1108 called_method.dex_file = caller->GetDexFile(); 1109 1110 InvokeType stack_map_invoke_type; 1111 uint32_t stack_map_dex_method_idx; 1112 const bool found_stack_map = QuickArgumentVisitor::GetInvokeType(sp, 1113 &stack_map_invoke_type, 1114 &stack_map_dex_method_idx); 1115 // For debug builds, we make sure both of the paths are consistent by also looking at the dex 1116 // code. 1117 if (!found_stack_map || kIsDebugBuild) { 1118 uint32_t dex_pc = QuickArgumentVisitor::GetCallingDexPc(sp); 1119 const DexFile::CodeItem* code; 1120 code = caller->GetCodeItem(); 1121 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 1122 const Instruction& instr = code->InstructionAt(dex_pc); 1123 Instruction::Code instr_code = instr.Opcode(); 1124 bool is_range; 1125 switch (instr_code) { 1126 case Instruction::INVOKE_DIRECT: 1127 invoke_type = kDirect; 1128 is_range = false; 1129 break; 1130 case Instruction::INVOKE_DIRECT_RANGE: 1131 invoke_type = kDirect; 1132 is_range = true; 1133 break; 1134 case Instruction::INVOKE_STATIC: 1135 invoke_type = kStatic; 1136 is_range = false; 1137 break; 1138 case Instruction::INVOKE_STATIC_RANGE: 1139 invoke_type = kStatic; 1140 is_range = true; 1141 break; 1142 case Instruction::INVOKE_SUPER: 1143 invoke_type = kSuper; 1144 is_range = false; 1145 break; 1146 case Instruction::INVOKE_SUPER_RANGE: 1147 invoke_type = kSuper; 1148 is_range = true; 1149 break; 1150 case Instruction::INVOKE_VIRTUAL: 1151 invoke_type = kVirtual; 1152 is_range = false; 1153 break; 1154 case Instruction::INVOKE_VIRTUAL_RANGE: 1155 invoke_type = kVirtual; 1156 is_range = true; 1157 break; 1158 case Instruction::INVOKE_INTERFACE: 1159 invoke_type = kInterface; 1160 is_range = false; 1161 break; 1162 case Instruction::INVOKE_INTERFACE_RANGE: 1163 invoke_type = kInterface; 1164 is_range = true; 1165 break; 1166 default: 1167 LOG(FATAL) << "Unexpected call into trampoline: " << instr.DumpString(nullptr); 1168 UNREACHABLE(); 1169 } 1170 called_method.index = (is_range) ? instr.VRegB_3rc() : instr.VRegB_35c(); 1171 // Check that the invoke matches what we expected, note that this path only happens for debug 1172 // builds. 1173 if (found_stack_map) { 1174 DCHECK_EQ(stack_map_invoke_type, invoke_type); 1175 if (invoke_type != kSuper) { 1176 // Super may be sharpened. 1177 DCHECK_EQ(stack_map_dex_method_idx, called_method.index) 1178 << called_method.dex_file->PrettyMethod(stack_map_dex_method_idx) << " " 1179 << called_method.PrettyMethod(); 1180 } 1181 } else { 1182 VLOG(dex) << "Accessed dex file for invoke " << invoke_type << " " 1183 << called_method.index; 1184 } 1185 } else { 1186 invoke_type = stack_map_invoke_type; 1187 called_method.index = stack_map_dex_method_idx; 1188 } 1189 } else { 1190 invoke_type = kStatic; 1191 called_method.dex_file = called->GetDexFile(); 1192 called_method.index = called->GetDexMethodIndex(); 1193 } 1194 uint32_t shorty_len; 1195 const char* shorty = 1196 called_method.dex_file->GetMethodShorty(called_method.GetMethodId(), &shorty_len); 1197 RememberForGcArgumentVisitor visitor(sp, invoke_type == kStatic, shorty, shorty_len, &soa); 1198 visitor.VisitArguments(); 1199 self->EndAssertNoThreadSuspension(old_cause); 1200 const bool virtual_or_interface = invoke_type == kVirtual || invoke_type == kInterface; 1201 // Resolve method filling in dex cache. 1202 if (!called_method_known_on_entry) { 1203 StackHandleScope<1> hs(self); 1204 mirror::Object* dummy = nullptr; 1205 HandleWrapper<mirror::Object> h_receiver( 1206 hs.NewHandleWrapper(virtual_or_interface ? &receiver : &dummy)); 1207 DCHECK_EQ(caller->GetDexFile(), called_method.dex_file); 1208 called = linker->ResolveMethod<ClassLinker::ResolveMode::kCheckICCEAndIAE>( 1209 self, called_method.index, caller, invoke_type); 1210 1211 // Update .bss entry in oat file if any. 1212 if (called != nullptr && called_method.dex_file->GetOatDexFile() != nullptr) { 1213 const MethodBssMapping* mapping = 1214 called_method.dex_file->GetOatDexFile()->GetMethodBssMapping(); 1215 if (mapping != nullptr) { 1216 auto pp = std::partition_point( 1217 mapping->begin(), 1218 mapping->end(), 1219 [called_method](const MethodBssMappingEntry& entry) { 1220 return entry.method_index < called_method.index; 1221 }); 1222 if (pp != mapping->end() && pp->CoversIndex(called_method.index)) { 1223 size_t bss_offset = pp->GetBssOffset(called_method.index, 1224 static_cast<size_t>(kRuntimePointerSize)); 1225 DCHECK_ALIGNED(bss_offset, static_cast<size_t>(kRuntimePointerSize)); 1226 const OatFile* oat_file = called_method.dex_file->GetOatDexFile()->GetOatFile(); 1227 ArtMethod** method_entry = reinterpret_cast<ArtMethod**>(const_cast<uint8_t*>( 1228 oat_file->BssBegin() + bss_offset)); 1229 DCHECK_GE(method_entry, oat_file->GetBssMethods().data()); 1230 DCHECK_LT(method_entry, 1231 oat_file->GetBssMethods().data() + oat_file->GetBssMethods().size()); 1232 *method_entry = called; 1233 } 1234 } 1235 } 1236 } 1237 const void* code = nullptr; 1238 if (LIKELY(!self->IsExceptionPending())) { 1239 // Incompatible class change should have been handled in resolve method. 1240 CHECK(!called->CheckIncompatibleClassChange(invoke_type)) 1241 << called->PrettyMethod() << " " << invoke_type; 1242 if (virtual_or_interface || invoke_type == kSuper) { 1243 // Refine called method based on receiver for kVirtual/kInterface, and 1244 // caller for kSuper. 1245 ArtMethod* orig_called = called; 1246 if (invoke_type == kVirtual) { 1247 CHECK(receiver != nullptr) << invoke_type; 1248 called = receiver->GetClass()->FindVirtualMethodForVirtual(called, kRuntimePointerSize); 1249 } else if (invoke_type == kInterface) { 1250 CHECK(receiver != nullptr) << invoke_type; 1251 called = receiver->GetClass()->FindVirtualMethodForInterface(called, kRuntimePointerSize); 1252 } else { 1253 DCHECK_EQ(invoke_type, kSuper); 1254 CHECK(caller != nullptr) << invoke_type; 1255 StackHandleScope<2> hs(self); 1256 Handle<mirror::DexCache> dex_cache( 1257 hs.NewHandle(caller->GetDeclaringClass()->GetDexCache())); 1258 Handle<mirror::ClassLoader> class_loader( 1259 hs.NewHandle(caller->GetDeclaringClass()->GetClassLoader())); 1260 // TODO Maybe put this into a mirror::Class function. 1261 ObjPtr<mirror::Class> ref_class = linker->LookupResolvedType( 1262 *dex_cache->GetDexFile(), 1263 dex_cache->GetDexFile()->GetMethodId(called_method.index).class_idx_, 1264 dex_cache.Get(), 1265 class_loader.Get()); 1266 if (ref_class->IsInterface()) { 1267 called = ref_class->FindVirtualMethodForInterfaceSuper(called, kRuntimePointerSize); 1268 } else { 1269 called = caller->GetDeclaringClass()->GetSuperClass()->GetVTableEntry( 1270 called->GetMethodIndex(), kRuntimePointerSize); 1271 } 1272 } 1273 1274 CHECK(called != nullptr) << orig_called->PrettyMethod() << " " 1275 << mirror::Object::PrettyTypeOf(receiver) << " " 1276 << invoke_type << " " << orig_called->GetVtableIndex(); 1277 } 1278 1279 // Ensure that the called method's class is initialized. 1280 StackHandleScope<1> hs(soa.Self()); 1281 Handle<mirror::Class> called_class(hs.NewHandle(called->GetDeclaringClass())); 1282 linker->EnsureInitialized(soa.Self(), called_class, true, true); 1283 if (LIKELY(called_class->IsInitialized())) { 1284 if (UNLIKELY(Dbg::IsForcedInterpreterNeededForResolution(self, called))) { 1285 // If we are single-stepping or the called method is deoptimized (by a 1286 // breakpoint, for example), then we have to execute the called method 1287 // with the interpreter. 1288 code = GetQuickToInterpreterBridge(); 1289 } else if (UNLIKELY(Dbg::IsForcedInstrumentationNeededForResolution(self, caller))) { 1290 // If the caller is deoptimized (by a breakpoint, for example), we have to 1291 // continue its execution with interpreter when returning from the called 1292 // method. Because we do not want to execute the called method with the 1293 // interpreter, we wrap its execution into the instrumentation stubs. 1294 // When the called method returns, it will execute the instrumentation 1295 // exit hook that will determine the need of the interpreter with a call 1296 // to Dbg::IsForcedInterpreterNeededForUpcall and deoptimize the stack if 1297 // it is needed. 1298 code = GetQuickInstrumentationEntryPoint(); 1299 } else { 1300 code = called->GetEntryPointFromQuickCompiledCode(); 1301 } 1302 } else if (called_class->IsInitializing()) { 1303 if (UNLIKELY(Dbg::IsForcedInterpreterNeededForResolution(self, called))) { 1304 // If we are single-stepping or the called method is deoptimized (by a 1305 // breakpoint, for example), then we have to execute the called method 1306 // with the interpreter. 1307 code = GetQuickToInterpreterBridge(); 1308 } else if (invoke_type == kStatic) { 1309 // Class is still initializing, go to oat and grab code (trampoline must be left in place 1310 // until class is initialized to stop races between threads). 1311 code = linker->GetQuickOatCodeFor(called); 1312 } else { 1313 // No trampoline for non-static methods. 1314 code = called->GetEntryPointFromQuickCompiledCode(); 1315 } 1316 } else { 1317 DCHECK(called_class->IsErroneous()); 1318 } 1319 } 1320 CHECK_EQ(code == nullptr, self->IsExceptionPending()); 1321 // Fixup any locally saved objects may have moved during a GC. 1322 visitor.FixupReferences(); 1323 // Place called method in callee-save frame to be placed as first argument to quick method. 1324 *sp = called; 1325 1326 return code; 1327} 1328 1329/* 1330 * This class uses a couple of observations to unite the different calling conventions through 1331 * a few constants. 1332 * 1333 * 1) Number of registers used for passing is normally even, so counting down has no penalty for 1334 * possible alignment. 1335 * 2) Known 64b architectures store 8B units on the stack, both for integral and floating point 1336 * types, so using uintptr_t is OK. Also means that we can use kRegistersNeededX to denote 1337 * when we have to split things 1338 * 3) The only soft-float, Arm, is 32b, so no widening needs to be taken into account for floats 1339 * and we can use Int handling directly. 1340 * 4) Only 64b architectures widen, and their stack is aligned 8B anyways, so no padding code 1341 * necessary when widening. Also, widening of Ints will take place implicitly, and the 1342 * extension should be compatible with Aarch64, which mandates copying the available bits 1343 * into LSB and leaving the rest unspecified. 1344 * 5) Aligning longs and doubles is necessary on arm only, and it's the same in registers and on 1345 * the stack. 1346 * 6) There is only little endian. 1347 * 1348 * 1349 * Actual work is supposed to be done in a delegate of the template type. The interface is as 1350 * follows: 1351 * 1352 * void PushGpr(uintptr_t): Add a value for the next GPR 1353 * 1354 * void PushFpr4(float): Add a value for the next FPR of size 32b. Is only called if we need 1355 * padding, that is, think the architecture is 32b and aligns 64b. 1356 * 1357 * void PushFpr8(uint64_t): Push a double. We _will_ call this on 32b, it's the callee's job to 1358 * split this if necessary. The current state will have aligned, if 1359 * necessary. 1360 * 1361 * void PushStack(uintptr_t): Push a value to the stack. 1362 * 1363 * uintptr_t PushHandleScope(mirror::Object* ref): Add a reference to the HandleScope. This _will_ have nullptr, 1364 * as this might be important for null initialization. 1365 * Must return the jobject, that is, the reference to the 1366 * entry in the HandleScope (nullptr if necessary). 1367 * 1368 */ 1369template<class T> class BuildNativeCallFrameStateMachine { 1370 public: 1371#if defined(__arm__) 1372 // TODO: These are all dummy values! 1373 static constexpr bool kNativeSoftFloatAbi = true; 1374 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs, r0-r3 1375 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 1376 1377 static constexpr size_t kRegistersNeededForLong = 2; 1378 static constexpr size_t kRegistersNeededForDouble = 2; 1379 static constexpr bool kMultiRegistersAligned = true; 1380 static constexpr bool kMultiFPRegistersWidened = false; 1381 static constexpr bool kMultiGPRegistersWidened = false; 1382 static constexpr bool kAlignLongOnStack = true; 1383 static constexpr bool kAlignDoubleOnStack = true; 1384#elif defined(__aarch64__) 1385 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 1386 static constexpr size_t kNumNativeGprArgs = 8; // 6 arguments passed in GPRs. 1387 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 1388 1389 static constexpr size_t kRegistersNeededForLong = 1; 1390 static constexpr size_t kRegistersNeededForDouble = 1; 1391 static constexpr bool kMultiRegistersAligned = false; 1392 static constexpr bool kMultiFPRegistersWidened = false; 1393 static constexpr bool kMultiGPRegistersWidened = false; 1394 static constexpr bool kAlignLongOnStack = false; 1395 static constexpr bool kAlignDoubleOnStack = false; 1396#elif defined(__mips__) && !defined(__LP64__) 1397 static constexpr bool kNativeSoftFloatAbi = true; // This is a hard float ABI. 1398 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs. 1399 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 1400 1401 static constexpr size_t kRegistersNeededForLong = 2; 1402 static constexpr size_t kRegistersNeededForDouble = 2; 1403 static constexpr bool kMultiRegistersAligned = true; 1404 static constexpr bool kMultiFPRegistersWidened = true; 1405 static constexpr bool kMultiGPRegistersWidened = false; 1406 static constexpr bool kAlignLongOnStack = true; 1407 static constexpr bool kAlignDoubleOnStack = true; 1408#elif defined(__mips__) && defined(__LP64__) 1409 // Let the code prepare GPRs only and we will load the FPRs with same data. 1410 static constexpr bool kNativeSoftFloatAbi = true; 1411 static constexpr size_t kNumNativeGprArgs = 8; 1412 static constexpr size_t kNumNativeFprArgs = 0; 1413 1414 static constexpr size_t kRegistersNeededForLong = 1; 1415 static constexpr size_t kRegistersNeededForDouble = 1; 1416 static constexpr bool kMultiRegistersAligned = false; 1417 static constexpr bool kMultiFPRegistersWidened = false; 1418 static constexpr bool kMultiGPRegistersWidened = true; 1419 static constexpr bool kAlignLongOnStack = false; 1420 static constexpr bool kAlignDoubleOnStack = false; 1421#elif defined(__i386__) 1422 // TODO: Check these! 1423 static constexpr bool kNativeSoftFloatAbi = false; // Not using int registers for fp 1424 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 1425 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 1426 1427 static constexpr size_t kRegistersNeededForLong = 2; 1428 static constexpr size_t kRegistersNeededForDouble = 2; 1429 static constexpr bool kMultiRegistersAligned = false; // x86 not using regs, anyways 1430 static constexpr bool kMultiFPRegistersWidened = false; 1431 static constexpr bool kMultiGPRegistersWidened = false; 1432 static constexpr bool kAlignLongOnStack = false; 1433 static constexpr bool kAlignDoubleOnStack = false; 1434#elif defined(__x86_64__) 1435 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 1436 static constexpr size_t kNumNativeGprArgs = 6; // 6 arguments passed in GPRs. 1437 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 1438 1439 static constexpr size_t kRegistersNeededForLong = 1; 1440 static constexpr size_t kRegistersNeededForDouble = 1; 1441 static constexpr bool kMultiRegistersAligned = false; 1442 static constexpr bool kMultiFPRegistersWidened = false; 1443 static constexpr bool kMultiGPRegistersWidened = false; 1444 static constexpr bool kAlignLongOnStack = false; 1445 static constexpr bool kAlignDoubleOnStack = false; 1446#else 1447#error "Unsupported architecture" 1448#endif 1449 1450 public: 1451 explicit BuildNativeCallFrameStateMachine(T* delegate) 1452 : gpr_index_(kNumNativeGprArgs), 1453 fpr_index_(kNumNativeFprArgs), 1454 stack_entries_(0), 1455 delegate_(delegate) { 1456 // For register alignment, we want to assume that counters (gpr_index_, fpr_index_) are even iff 1457 // the next register is even; counting down is just to make the compiler happy... 1458 static_assert(kNumNativeGprArgs % 2 == 0U, "Number of native GPR arguments not even"); 1459 static_assert(kNumNativeFprArgs % 2 == 0U, "Number of native FPR arguments not even"); 1460 } 1461 1462 virtual ~BuildNativeCallFrameStateMachine() {} 1463 1464 bool HavePointerGpr() const { 1465 return gpr_index_ > 0; 1466 } 1467 1468 void AdvancePointer(const void* val) { 1469 if (HavePointerGpr()) { 1470 gpr_index_--; 1471 PushGpr(reinterpret_cast<uintptr_t>(val)); 1472 } else { 1473 stack_entries_++; // TODO: have a field for pointer length as multiple of 32b 1474 PushStack(reinterpret_cast<uintptr_t>(val)); 1475 gpr_index_ = 0; 1476 } 1477 } 1478 1479 bool HaveHandleScopeGpr() const { 1480 return gpr_index_ > 0; 1481 } 1482 1483 void AdvanceHandleScope(mirror::Object* ptr) REQUIRES_SHARED(Locks::mutator_lock_) { 1484 uintptr_t handle = PushHandle(ptr); 1485 if (HaveHandleScopeGpr()) { 1486 gpr_index_--; 1487 PushGpr(handle); 1488 } else { 1489 stack_entries_++; 1490 PushStack(handle); 1491 gpr_index_ = 0; 1492 } 1493 } 1494 1495 bool HaveIntGpr() const { 1496 return gpr_index_ > 0; 1497 } 1498 1499 void AdvanceInt(uint32_t val) { 1500 if (HaveIntGpr()) { 1501 gpr_index_--; 1502 if (kMultiGPRegistersWidened) { 1503 DCHECK_EQ(sizeof(uintptr_t), sizeof(int64_t)); 1504 PushGpr(static_cast<int64_t>(bit_cast<int32_t, uint32_t>(val))); 1505 } else { 1506 PushGpr(val); 1507 } 1508 } else { 1509 stack_entries_++; 1510 if (kMultiGPRegistersWidened) { 1511 DCHECK_EQ(sizeof(uintptr_t), sizeof(int64_t)); 1512 PushStack(static_cast<int64_t>(bit_cast<int32_t, uint32_t>(val))); 1513 } else { 1514 PushStack(val); 1515 } 1516 gpr_index_ = 0; 1517 } 1518 } 1519 1520 bool HaveLongGpr() const { 1521 return gpr_index_ >= kRegistersNeededForLong + (LongGprNeedsPadding() ? 1 : 0); 1522 } 1523 1524 bool LongGprNeedsPadding() const { 1525 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1526 kAlignLongOnStack && // and when it needs alignment 1527 (gpr_index_ & 1) == 1; // counter is odd, see constructor 1528 } 1529 1530 bool LongStackNeedsPadding() const { 1531 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1532 kAlignLongOnStack && // and when it needs 8B alignment 1533 (stack_entries_ & 1) == 1; // counter is odd 1534 } 1535 1536 void AdvanceLong(uint64_t val) { 1537 if (HaveLongGpr()) { 1538 if (LongGprNeedsPadding()) { 1539 PushGpr(0); 1540 gpr_index_--; 1541 } 1542 if (kRegistersNeededForLong == 1) { 1543 PushGpr(static_cast<uintptr_t>(val)); 1544 } else { 1545 PushGpr(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1546 PushGpr(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1547 } 1548 gpr_index_ -= kRegistersNeededForLong; 1549 } else { 1550 if (LongStackNeedsPadding()) { 1551 PushStack(0); 1552 stack_entries_++; 1553 } 1554 if (kRegistersNeededForLong == 1) { 1555 PushStack(static_cast<uintptr_t>(val)); 1556 stack_entries_++; 1557 } else { 1558 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1559 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1560 stack_entries_ += 2; 1561 } 1562 gpr_index_ = 0; 1563 } 1564 } 1565 1566 bool HaveFloatFpr() const { 1567 return fpr_index_ > 0; 1568 } 1569 1570 void AdvanceFloat(float val) { 1571 if (kNativeSoftFloatAbi) { 1572 AdvanceInt(bit_cast<uint32_t, float>(val)); 1573 } else { 1574 if (HaveFloatFpr()) { 1575 fpr_index_--; 1576 if (kRegistersNeededForDouble == 1) { 1577 if (kMultiFPRegistersWidened) { 1578 PushFpr8(bit_cast<uint64_t, double>(val)); 1579 } else { 1580 // No widening, just use the bits. 1581 PushFpr8(static_cast<uint64_t>(bit_cast<uint32_t, float>(val))); 1582 } 1583 } else { 1584 PushFpr4(val); 1585 } 1586 } else { 1587 stack_entries_++; 1588 if (kRegistersNeededForDouble == 1 && kMultiFPRegistersWidened) { 1589 // Need to widen before storing: Note the "double" in the template instantiation. 1590 // Note: We need to jump through those hoops to make the compiler happy. 1591 DCHECK_EQ(sizeof(uintptr_t), sizeof(uint64_t)); 1592 PushStack(static_cast<uintptr_t>(bit_cast<uint64_t, double>(val))); 1593 } else { 1594 PushStack(static_cast<uintptr_t>(bit_cast<uint32_t, float>(val))); 1595 } 1596 fpr_index_ = 0; 1597 } 1598 } 1599 } 1600 1601 bool HaveDoubleFpr() const { 1602 return fpr_index_ >= kRegistersNeededForDouble + (DoubleFprNeedsPadding() ? 1 : 0); 1603 } 1604 1605 bool DoubleFprNeedsPadding() const { 1606 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1607 kAlignDoubleOnStack && // and when it needs alignment 1608 (fpr_index_ & 1) == 1; // counter is odd, see constructor 1609 } 1610 1611 bool DoubleStackNeedsPadding() const { 1612 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1613 kAlignDoubleOnStack && // and when it needs 8B alignment 1614 (stack_entries_ & 1) == 1; // counter is odd 1615 } 1616 1617 void AdvanceDouble(uint64_t val) { 1618 if (kNativeSoftFloatAbi) { 1619 AdvanceLong(val); 1620 } else { 1621 if (HaveDoubleFpr()) { 1622 if (DoubleFprNeedsPadding()) { 1623 PushFpr4(0); 1624 fpr_index_--; 1625 } 1626 PushFpr8(val); 1627 fpr_index_ -= kRegistersNeededForDouble; 1628 } else { 1629 if (DoubleStackNeedsPadding()) { 1630 PushStack(0); 1631 stack_entries_++; 1632 } 1633 if (kRegistersNeededForDouble == 1) { 1634 PushStack(static_cast<uintptr_t>(val)); 1635 stack_entries_++; 1636 } else { 1637 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1638 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1639 stack_entries_ += 2; 1640 } 1641 fpr_index_ = 0; 1642 } 1643 } 1644 } 1645 1646 uint32_t GetStackEntries() const { 1647 return stack_entries_; 1648 } 1649 1650 uint32_t GetNumberOfUsedGprs() const { 1651 return kNumNativeGprArgs - gpr_index_; 1652 } 1653 1654 uint32_t GetNumberOfUsedFprs() const { 1655 return kNumNativeFprArgs - fpr_index_; 1656 } 1657 1658 private: 1659 void PushGpr(uintptr_t val) { 1660 delegate_->PushGpr(val); 1661 } 1662 void PushFpr4(float val) { 1663 delegate_->PushFpr4(val); 1664 } 1665 void PushFpr8(uint64_t val) { 1666 delegate_->PushFpr8(val); 1667 } 1668 void PushStack(uintptr_t val) { 1669 delegate_->PushStack(val); 1670 } 1671 uintptr_t PushHandle(mirror::Object* ref) REQUIRES_SHARED(Locks::mutator_lock_) { 1672 return delegate_->PushHandle(ref); 1673 } 1674 1675 uint32_t gpr_index_; // Number of free GPRs 1676 uint32_t fpr_index_; // Number of free FPRs 1677 uint32_t stack_entries_; // Stack entries are in multiples of 32b, as floats are usually not 1678 // extended 1679 T* const delegate_; // What Push implementation gets called 1680}; 1681 1682// Computes the sizes of register stacks and call stack area. Handling of references can be extended 1683// in subclasses. 1684// 1685// To handle native pointers, use "L" in the shorty for an object reference, which simulates 1686// them with handles. 1687class ComputeNativeCallFrameSize { 1688 public: 1689 ComputeNativeCallFrameSize() : num_stack_entries_(0) {} 1690 1691 virtual ~ComputeNativeCallFrameSize() {} 1692 1693 uint32_t GetStackSize() const { 1694 return num_stack_entries_ * sizeof(uintptr_t); 1695 } 1696 1697 uint8_t* LayoutCallStack(uint8_t* sp8) const { 1698 sp8 -= GetStackSize(); 1699 // Align by kStackAlignment. 1700 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1701 return sp8; 1702 } 1703 1704 uint8_t* LayoutCallRegisterStacks(uint8_t* sp8, uintptr_t** start_gpr, uint32_t** start_fpr) 1705 const { 1706 // Assumption is OK right now, as we have soft-float arm 1707 size_t fregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeFprArgs; 1708 sp8 -= fregs * sizeof(uintptr_t); 1709 *start_fpr = reinterpret_cast<uint32_t*>(sp8); 1710 size_t iregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeGprArgs; 1711 sp8 -= iregs * sizeof(uintptr_t); 1712 *start_gpr = reinterpret_cast<uintptr_t*>(sp8); 1713 return sp8; 1714 } 1715 1716 uint8_t* LayoutNativeCall(uint8_t* sp8, uintptr_t** start_stack, uintptr_t** start_gpr, 1717 uint32_t** start_fpr) const { 1718 // Native call stack. 1719 sp8 = LayoutCallStack(sp8); 1720 *start_stack = reinterpret_cast<uintptr_t*>(sp8); 1721 1722 // Put fprs and gprs below. 1723 sp8 = LayoutCallRegisterStacks(sp8, start_gpr, start_fpr); 1724 1725 // Return the new bottom. 1726 return sp8; 1727 } 1728 1729 virtual void WalkHeader( 1730 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm ATTRIBUTE_UNUSED) 1731 REQUIRES_SHARED(Locks::mutator_lock_) { 1732 } 1733 1734 void Walk(const char* shorty, uint32_t shorty_len) REQUIRES_SHARED(Locks::mutator_lock_) { 1735 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize> sm(this); 1736 1737 WalkHeader(&sm); 1738 1739 for (uint32_t i = 1; i < shorty_len; ++i) { 1740 Primitive::Type cur_type_ = Primitive::GetType(shorty[i]); 1741 switch (cur_type_) { 1742 case Primitive::kPrimNot: 1743 // TODO: fix abuse of mirror types. 1744 sm.AdvanceHandleScope( 1745 reinterpret_cast<mirror::Object*>(0x12345678)); 1746 break; 1747 1748 case Primitive::kPrimBoolean: 1749 case Primitive::kPrimByte: 1750 case Primitive::kPrimChar: 1751 case Primitive::kPrimShort: 1752 case Primitive::kPrimInt: 1753 sm.AdvanceInt(0); 1754 break; 1755 case Primitive::kPrimFloat: 1756 sm.AdvanceFloat(0); 1757 break; 1758 case Primitive::kPrimDouble: 1759 sm.AdvanceDouble(0); 1760 break; 1761 case Primitive::kPrimLong: 1762 sm.AdvanceLong(0); 1763 break; 1764 default: 1765 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty; 1766 UNREACHABLE(); 1767 } 1768 } 1769 1770 num_stack_entries_ = sm.GetStackEntries(); 1771 } 1772 1773 void PushGpr(uintptr_t /* val */) { 1774 // not optimizing registers, yet 1775 } 1776 1777 void PushFpr4(float /* val */) { 1778 // not optimizing registers, yet 1779 } 1780 1781 void PushFpr8(uint64_t /* val */) { 1782 // not optimizing registers, yet 1783 } 1784 1785 void PushStack(uintptr_t /* val */) { 1786 // counting is already done in the superclass 1787 } 1788 1789 virtual uintptr_t PushHandle(mirror::Object* /* ptr */) { 1790 return reinterpret_cast<uintptr_t>(nullptr); 1791 } 1792 1793 protected: 1794 uint32_t num_stack_entries_; 1795}; 1796 1797class ComputeGenericJniFrameSize FINAL : public ComputeNativeCallFrameSize { 1798 public: 1799 explicit ComputeGenericJniFrameSize(bool critical_native) 1800 : num_handle_scope_references_(0), critical_native_(critical_native) {} 1801 1802 // Lays out the callee-save frame. Assumes that the incorrect frame corresponding to RefsAndArgs 1803 // is at *m = sp. Will update to point to the bottom of the save frame. 1804 // 1805 // Note: assumes ComputeAll() has been run before. 1806 void LayoutCalleeSaveFrame(Thread* self, ArtMethod*** m, void* sp, HandleScope** handle_scope) 1807 REQUIRES_SHARED(Locks::mutator_lock_) { 1808 ArtMethod* method = **m; 1809 1810 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 1811 1812 uint8_t* sp8 = reinterpret_cast<uint8_t*>(sp); 1813 1814 // First, fix up the layout of the callee-save frame. 1815 // We have to squeeze in the HandleScope, and relocate the method pointer. 1816 1817 // "Free" the slot for the method. 1818 sp8 += sizeof(void*); // In the callee-save frame we use a full pointer. 1819 1820 // Under the callee saves put handle scope and new method stack reference. 1821 size_t handle_scope_size = HandleScope::SizeOf(num_handle_scope_references_); 1822 size_t scope_and_method = handle_scope_size + sizeof(ArtMethod*); 1823 1824 sp8 -= scope_and_method; 1825 // Align by kStackAlignment. 1826 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1827 1828 uint8_t* sp8_table = sp8 + sizeof(ArtMethod*); 1829 *handle_scope = HandleScope::Create(sp8_table, self->GetTopHandleScope(), 1830 num_handle_scope_references_); 1831 1832 // Add a slot for the method pointer, and fill it. Fix the pointer-pointer given to us. 1833 uint8_t* method_pointer = sp8; 1834 auto** new_method_ref = reinterpret_cast<ArtMethod**>(method_pointer); 1835 *new_method_ref = method; 1836 *m = new_method_ref; 1837 } 1838 1839 // Adds space for the cookie. Note: may leave stack unaligned. 1840 void LayoutCookie(uint8_t** sp) const { 1841 // Reference cookie and padding 1842 *sp -= 8; 1843 } 1844 1845 // Re-layout the callee-save frame (insert a handle-scope). Then add space for the cookie. 1846 // Returns the new bottom. Note: this may be unaligned. 1847 uint8_t* LayoutJNISaveFrame(Thread* self, ArtMethod*** m, void* sp, HandleScope** handle_scope) 1848 REQUIRES_SHARED(Locks::mutator_lock_) { 1849 // First, fix up the layout of the callee-save frame. 1850 // We have to squeeze in the HandleScope, and relocate the method pointer. 1851 LayoutCalleeSaveFrame(self, m, sp, handle_scope); 1852 1853 // The bottom of the callee-save frame is now where the method is, *m. 1854 uint8_t* sp8 = reinterpret_cast<uint8_t*>(*m); 1855 1856 // Add space for cookie. 1857 LayoutCookie(&sp8); 1858 1859 return sp8; 1860 } 1861 1862 // WARNING: After this, *sp won't be pointing to the method anymore! 1863 uint8_t* ComputeLayout(Thread* self, ArtMethod*** m, const char* shorty, uint32_t shorty_len, 1864 HandleScope** handle_scope, uintptr_t** start_stack, uintptr_t** start_gpr, 1865 uint32_t** start_fpr) 1866 REQUIRES_SHARED(Locks::mutator_lock_) { 1867 Walk(shorty, shorty_len); 1868 1869 // JNI part. 1870 uint8_t* sp8 = LayoutJNISaveFrame(self, m, reinterpret_cast<void*>(*m), handle_scope); 1871 1872 sp8 = LayoutNativeCall(sp8, start_stack, start_gpr, start_fpr); 1873 1874 // Return the new bottom. 1875 return sp8; 1876 } 1877 1878 uintptr_t PushHandle(mirror::Object* /* ptr */) OVERRIDE; 1879 1880 // Add JNIEnv* and jobj/jclass before the shorty-derived elements. 1881 void WalkHeader(BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) OVERRIDE 1882 REQUIRES_SHARED(Locks::mutator_lock_); 1883 1884 private: 1885 uint32_t num_handle_scope_references_; 1886 const bool critical_native_; 1887}; 1888 1889uintptr_t ComputeGenericJniFrameSize::PushHandle(mirror::Object* /* ptr */) { 1890 num_handle_scope_references_++; 1891 return reinterpret_cast<uintptr_t>(nullptr); 1892} 1893 1894void ComputeGenericJniFrameSize::WalkHeader( 1895 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) { 1896 // First 2 parameters are always excluded for @CriticalNative. 1897 if (UNLIKELY(critical_native_)) { 1898 return; 1899 } 1900 1901 // JNIEnv 1902 sm->AdvancePointer(nullptr); 1903 1904 // Class object or this as first argument 1905 sm->AdvanceHandleScope(reinterpret_cast<mirror::Object*>(0x12345678)); 1906} 1907 1908// Class to push values to three separate regions. Used to fill the native call part. Adheres to 1909// the template requirements of BuildGenericJniFrameStateMachine. 1910class FillNativeCall { 1911 public: 1912 FillNativeCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) : 1913 cur_gpr_reg_(gpr_regs), cur_fpr_reg_(fpr_regs), cur_stack_arg_(stack_args) {} 1914 1915 virtual ~FillNativeCall() {} 1916 1917 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) { 1918 cur_gpr_reg_ = gpr_regs; 1919 cur_fpr_reg_ = fpr_regs; 1920 cur_stack_arg_ = stack_args; 1921 } 1922 1923 void PushGpr(uintptr_t val) { 1924 *cur_gpr_reg_ = val; 1925 cur_gpr_reg_++; 1926 } 1927 1928 void PushFpr4(float val) { 1929 *cur_fpr_reg_ = val; 1930 cur_fpr_reg_++; 1931 } 1932 1933 void PushFpr8(uint64_t val) { 1934 uint64_t* tmp = reinterpret_cast<uint64_t*>(cur_fpr_reg_); 1935 *tmp = val; 1936 cur_fpr_reg_ += 2; 1937 } 1938 1939 void PushStack(uintptr_t val) { 1940 *cur_stack_arg_ = val; 1941 cur_stack_arg_++; 1942 } 1943 1944 virtual uintptr_t PushHandle(mirror::Object*) REQUIRES_SHARED(Locks::mutator_lock_) { 1945 LOG(FATAL) << "(Non-JNI) Native call does not use handles."; 1946 UNREACHABLE(); 1947 } 1948 1949 private: 1950 uintptr_t* cur_gpr_reg_; 1951 uint32_t* cur_fpr_reg_; 1952 uintptr_t* cur_stack_arg_; 1953}; 1954 1955// Visits arguments on the stack placing them into a region lower down the stack for the benefit 1956// of transitioning into native code. 1957class BuildGenericJniFrameVisitor FINAL : public QuickArgumentVisitor { 1958 public: 1959 BuildGenericJniFrameVisitor(Thread* self, 1960 bool is_static, 1961 bool critical_native, 1962 const char* shorty, 1963 uint32_t shorty_len, 1964 ArtMethod*** sp) 1965 : QuickArgumentVisitor(*sp, is_static, shorty, shorty_len), 1966 jni_call_(nullptr, nullptr, nullptr, nullptr, critical_native), 1967 sm_(&jni_call_) { 1968 ComputeGenericJniFrameSize fsc(critical_native); 1969 uintptr_t* start_gpr_reg; 1970 uint32_t* start_fpr_reg; 1971 uintptr_t* start_stack_arg; 1972 bottom_of_used_area_ = fsc.ComputeLayout(self, sp, shorty, shorty_len, 1973 &handle_scope_, 1974 &start_stack_arg, 1975 &start_gpr_reg, &start_fpr_reg); 1976 1977 jni_call_.Reset(start_gpr_reg, start_fpr_reg, start_stack_arg, handle_scope_); 1978 1979 // First 2 parameters are always excluded for CriticalNative methods. 1980 if (LIKELY(!critical_native)) { 1981 // jni environment is always first argument 1982 sm_.AdvancePointer(self->GetJniEnv()); 1983 1984 if (is_static) { 1985 sm_.AdvanceHandleScope((**sp)->GetDeclaringClass()); 1986 } // else "this" reference is already handled by QuickArgumentVisitor. 1987 } 1988 } 1989 1990 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 1991 1992 void FinalizeHandleScope(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_); 1993 1994 StackReference<mirror::Object>* GetFirstHandleScopeEntry() { 1995 return handle_scope_->GetHandle(0).GetReference(); 1996 } 1997 1998 jobject GetFirstHandleScopeJObject() const REQUIRES_SHARED(Locks::mutator_lock_) { 1999 return handle_scope_->GetHandle(0).ToJObject(); 2000 } 2001 2002 void* GetBottomOfUsedArea() const { 2003 return bottom_of_used_area_; 2004 } 2005 2006 private: 2007 // A class to fill a JNI call. Adds reference/handle-scope management to FillNativeCall. 2008 class FillJniCall FINAL : public FillNativeCall { 2009 public: 2010 FillJniCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, 2011 HandleScope* handle_scope, bool critical_native) 2012 : FillNativeCall(gpr_regs, fpr_regs, stack_args), 2013 handle_scope_(handle_scope), 2014 cur_entry_(0), 2015 critical_native_(critical_native) {} 2016 2017 uintptr_t PushHandle(mirror::Object* ref) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_); 2018 2019 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, HandleScope* scope) { 2020 FillNativeCall::Reset(gpr_regs, fpr_regs, stack_args); 2021 handle_scope_ = scope; 2022 cur_entry_ = 0U; 2023 } 2024 2025 void ResetRemainingScopeSlots() REQUIRES_SHARED(Locks::mutator_lock_) { 2026 // Initialize padding entries. 2027 size_t expected_slots = handle_scope_->NumberOfReferences(); 2028 while (cur_entry_ < expected_slots) { 2029 handle_scope_->GetMutableHandle(cur_entry_++).Assign(nullptr); 2030 } 2031 2032 if (!critical_native_) { 2033 // Non-critical natives have at least the self class (jclass) or this (jobject). 2034 DCHECK_NE(cur_entry_, 0U); 2035 } 2036 } 2037 2038 bool CriticalNative() const { 2039 return critical_native_; 2040 } 2041 2042 private: 2043 HandleScope* handle_scope_; 2044 size_t cur_entry_; 2045 const bool critical_native_; 2046 }; 2047 2048 HandleScope* handle_scope_; 2049 FillJniCall jni_call_; 2050 void* bottom_of_used_area_; 2051 2052 BuildNativeCallFrameStateMachine<FillJniCall> sm_; 2053 2054 DISALLOW_COPY_AND_ASSIGN(BuildGenericJniFrameVisitor); 2055}; 2056 2057uintptr_t BuildGenericJniFrameVisitor::FillJniCall::PushHandle(mirror::Object* ref) { 2058 uintptr_t tmp; 2059 MutableHandle<mirror::Object> h = handle_scope_->GetMutableHandle(cur_entry_); 2060 h.Assign(ref); 2061 tmp = reinterpret_cast<uintptr_t>(h.ToJObject()); 2062 cur_entry_++; 2063 return tmp; 2064} 2065 2066void BuildGenericJniFrameVisitor::Visit() { 2067 Primitive::Type type = GetParamPrimitiveType(); 2068 switch (type) { 2069 case Primitive::kPrimLong: { 2070 jlong long_arg; 2071 if (IsSplitLongOrDouble()) { 2072 long_arg = ReadSplitLongParam(); 2073 } else { 2074 long_arg = *reinterpret_cast<jlong*>(GetParamAddress()); 2075 } 2076 sm_.AdvanceLong(long_arg); 2077 break; 2078 } 2079 case Primitive::kPrimDouble: { 2080 uint64_t double_arg; 2081 if (IsSplitLongOrDouble()) { 2082 // Read into union so that we don't case to a double. 2083 double_arg = ReadSplitLongParam(); 2084 } else { 2085 double_arg = *reinterpret_cast<uint64_t*>(GetParamAddress()); 2086 } 2087 sm_.AdvanceDouble(double_arg); 2088 break; 2089 } 2090 case Primitive::kPrimNot: { 2091 StackReference<mirror::Object>* stack_ref = 2092 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 2093 sm_.AdvanceHandleScope(stack_ref->AsMirrorPtr()); 2094 break; 2095 } 2096 case Primitive::kPrimFloat: 2097 sm_.AdvanceFloat(*reinterpret_cast<float*>(GetParamAddress())); 2098 break; 2099 case Primitive::kPrimBoolean: // Fall-through. 2100 case Primitive::kPrimByte: // Fall-through. 2101 case Primitive::kPrimChar: // Fall-through. 2102 case Primitive::kPrimShort: // Fall-through. 2103 case Primitive::kPrimInt: // Fall-through. 2104 sm_.AdvanceInt(*reinterpret_cast<jint*>(GetParamAddress())); 2105 break; 2106 case Primitive::kPrimVoid: 2107 LOG(FATAL) << "UNREACHABLE"; 2108 UNREACHABLE(); 2109 } 2110} 2111 2112void BuildGenericJniFrameVisitor::FinalizeHandleScope(Thread* self) { 2113 // Clear out rest of the scope. 2114 jni_call_.ResetRemainingScopeSlots(); 2115 if (!jni_call_.CriticalNative()) { 2116 // Install HandleScope. 2117 self->PushHandleScope(handle_scope_); 2118 } 2119} 2120 2121#if defined(__arm__) || defined(__aarch64__) 2122extern "C" const void* artFindNativeMethod(); 2123#else 2124extern "C" const void* artFindNativeMethod(Thread* self); 2125#endif 2126 2127static uint64_t artQuickGenericJniEndJNIRef(Thread* self, 2128 uint32_t cookie, 2129 bool fast_native ATTRIBUTE_UNUSED, 2130 jobject l, 2131 jobject lock) { 2132 // TODO: add entrypoints for @FastNative returning objects. 2133 if (lock != nullptr) { 2134 return reinterpret_cast<uint64_t>(JniMethodEndWithReferenceSynchronized(l, cookie, lock, self)); 2135 } else { 2136 return reinterpret_cast<uint64_t>(JniMethodEndWithReference(l, cookie, self)); 2137 } 2138} 2139 2140static void artQuickGenericJniEndJNINonRef(Thread* self, 2141 uint32_t cookie, 2142 bool fast_native, 2143 jobject lock) { 2144 if (lock != nullptr) { 2145 JniMethodEndSynchronized(cookie, lock, self); 2146 // Ignore "fast_native" here because synchronized functions aren't very fast. 2147 } else { 2148 if (UNLIKELY(fast_native)) { 2149 JniMethodFastEnd(cookie, self); 2150 } else { 2151 JniMethodEnd(cookie, self); 2152 } 2153 } 2154} 2155 2156/* 2157 * Initializes an alloca region assumed to be directly below sp for a native call: 2158 * Create a HandleScope and call stack and fill a mini stack with values to be pushed to registers. 2159 * The final element on the stack is a pointer to the native code. 2160 * 2161 * On entry, the stack has a standard callee-save frame above sp, and an alloca below it. 2162 * We need to fix this, as the handle scope needs to go into the callee-save frame. 2163 * 2164 * The return of this function denotes: 2165 * 1) How many bytes of the alloca can be released, if the value is non-negative. 2166 * 2) An error, if the value is negative. 2167 */ 2168extern "C" TwoWordReturn artQuickGenericJniTrampoline(Thread* self, ArtMethod** sp) 2169 REQUIRES_SHARED(Locks::mutator_lock_) { 2170 ArtMethod* called = *sp; 2171 DCHECK(called->IsNative()) << called->PrettyMethod(true); 2172 // Fix up a callee-save frame at the bottom of the stack (at `*sp`, 2173 // above the alloca region) while we check for optimization 2174 // annotations, thus allowing stack walking until the completion of 2175 // the JNI frame creation. 2176 // 2177 // Note however that the Generic JNI trampoline does not expect 2178 // exception being thrown at that stage. 2179 *sp = Runtime::Current()->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsAndArgs); 2180 self->SetTopOfStack(sp); 2181 uint32_t shorty_len = 0; 2182 const char* shorty = called->GetShorty(&shorty_len); 2183 // Optimization annotations lookup does not try to resolve classes, 2184 // as this may throw an exception, which is not supported by the 2185 // Generic JNI trampoline at this stage; instead, method's 2186 // annotations' classes are looked up in the bootstrap class 2187 // loader's resolved types (which won't trigger an exception). 2188 CHECK(!self->IsExceptionPending()); 2189 bool critical_native = called->IsAnnotatedWithCriticalNative(); 2190 CHECK(!self->IsExceptionPending()); 2191 bool fast_native = called->IsAnnotatedWithFastNative(); 2192 CHECK(!self->IsExceptionPending()); 2193 bool normal_native = !critical_native && !fast_native; 2194 // Restore the initial ArtMethod pointer at `*sp`. 2195 *sp = called; 2196 2197 // Run the visitor and update sp. 2198 BuildGenericJniFrameVisitor visitor(self, 2199 called->IsStatic(), 2200 critical_native, 2201 shorty, 2202 shorty_len, 2203 &sp); 2204 { 2205 ScopedAssertNoThreadSuspension sants(__FUNCTION__); 2206 visitor.VisitArguments(); 2207 // FinalizeHandleScope pushes the handle scope on the thread. 2208 visitor.FinalizeHandleScope(self); 2209 } 2210 2211 // Fix up managed-stack things in Thread. 2212 self->SetTopOfStack(sp); 2213 2214 self->VerifyStack(); 2215 2216 uint32_t cookie; 2217 uint32_t* sp32; 2218 // Skip calling JniMethodStart for @CriticalNative. 2219 if (LIKELY(!critical_native)) { 2220 // Start JNI, save the cookie. 2221 if (called->IsSynchronized()) { 2222 DCHECK(normal_native) << " @FastNative and synchronize is not supported"; 2223 cookie = JniMethodStartSynchronized(visitor.GetFirstHandleScopeJObject(), self); 2224 if (self->IsExceptionPending()) { 2225 self->PopHandleScope(); 2226 // A negative value denotes an error. 2227 return GetTwoWordFailureValue(); 2228 } 2229 } else { 2230 if (fast_native) { 2231 cookie = JniMethodFastStart(self); 2232 } else { 2233 DCHECK(normal_native); 2234 cookie = JniMethodStart(self); 2235 } 2236 } 2237 sp32 = reinterpret_cast<uint32_t*>(sp); 2238 *(sp32 - 1) = cookie; 2239 } 2240 2241 // Retrieve the stored native code. 2242 void const* nativeCode = called->GetEntryPointFromJni(); 2243 2244 // There are two cases for the content of nativeCode: 2245 // 1) Pointer to the native function. 2246 // 2) Pointer to the trampoline for native code binding. 2247 // In the second case, we need to execute the binding and continue with the actual native function 2248 // pointer. 2249 DCHECK(nativeCode != nullptr); 2250 if (nativeCode == GetJniDlsymLookupStub()) { 2251#if defined(__arm__) || defined(__aarch64__) 2252 nativeCode = artFindNativeMethod(); 2253#else 2254 nativeCode = artFindNativeMethod(self); 2255#endif 2256 2257 if (nativeCode == nullptr) { 2258 DCHECK(self->IsExceptionPending()); // There should be an exception pending now. 2259 2260 // @CriticalNative calls do not need to call back into JniMethodEnd. 2261 if (LIKELY(!critical_native)) { 2262 // End JNI, as the assembly will move to deliver the exception. 2263 jobject lock = called->IsSynchronized() ? visitor.GetFirstHandleScopeJObject() : nullptr; 2264 if (shorty[0] == 'L') { 2265 artQuickGenericJniEndJNIRef(self, cookie, fast_native, nullptr, lock); 2266 } else { 2267 artQuickGenericJniEndJNINonRef(self, cookie, fast_native, lock); 2268 } 2269 } 2270 2271 return GetTwoWordFailureValue(); 2272 } 2273 // Note that the native code pointer will be automatically set by artFindNativeMethod(). 2274 } 2275 2276#if defined(__mips__) && !defined(__LP64__) 2277 // On MIPS32 if the first two arguments are floating-point, we need to know their types 2278 // so that art_quick_generic_jni_trampoline can correctly extract them from the stack 2279 // and load into floating-point registers. 2280 // Possible arrangements of first two floating-point arguments on the stack (32-bit FPU 2281 // view): 2282 // (1) 2283 // | DOUBLE | DOUBLE | other args, if any 2284 // | F12 | F13 | F14 | F15 | 2285 // | SP+0 | SP+4 | SP+8 | SP+12 | SP+16 2286 // (2) 2287 // | DOUBLE | FLOAT | (PAD) | other args, if any 2288 // | F12 | F13 | F14 | | 2289 // | SP+0 | SP+4 | SP+8 | SP+12 | SP+16 2290 // (3) 2291 // | FLOAT | (PAD) | DOUBLE | other args, if any 2292 // | F12 | | F14 | F15 | 2293 // | SP+0 | SP+4 | SP+8 | SP+12 | SP+16 2294 // (4) 2295 // | FLOAT | FLOAT | other args, if any 2296 // | F12 | F14 | 2297 // | SP+0 | SP+4 | SP+8 2298 // As you can see, only the last case (4) is special. In all others we can just 2299 // load F12/F13 and F14/F15 in the same manner. 2300 // Set bit 0 of the native code address to 1 in this case (valid code addresses 2301 // are always a multiple of 4 on MIPS32, so we have 2 spare bits available). 2302 if (nativeCode != nullptr && 2303 shorty != nullptr && 2304 shorty_len >= 3 && 2305 shorty[1] == 'F' && 2306 shorty[2] == 'F') { 2307 nativeCode = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(nativeCode) | 1); 2308 } 2309#endif 2310 2311 // Return native code addr(lo) and bottom of alloca address(hi). 2312 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(visitor.GetBottomOfUsedArea()), 2313 reinterpret_cast<uintptr_t>(nativeCode)); 2314} 2315 2316// Defined in quick_jni_entrypoints.cc. 2317extern uint64_t GenericJniMethodEnd(Thread* self, uint32_t saved_local_ref_cookie, 2318 jvalue result, uint64_t result_f, ArtMethod* called, 2319 HandleScope* handle_scope); 2320/* 2321 * Is called after the native JNI code. Responsible for cleanup (handle scope, saved state) and 2322 * unlocking. 2323 */ 2324extern "C" uint64_t artQuickGenericJniEndTrampoline(Thread* self, 2325 jvalue result, 2326 uint64_t result_f) { 2327 // We're here just back from a native call. We don't have the shared mutator lock at this point 2328 // yet until we call GoToRunnable() later in GenericJniMethodEnd(). Accessing objects or doing 2329 // anything that requires a mutator lock before that would cause problems as GC may have the 2330 // exclusive mutator lock and may be moving objects, etc. 2331 ArtMethod** sp = self->GetManagedStack()->GetTopQuickFrame(); 2332 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 2333 ArtMethod* called = *sp; 2334 uint32_t cookie = *(sp32 - 1); 2335 HandleScope* table = reinterpret_cast<HandleScope*>(reinterpret_cast<uint8_t*>(sp) + sizeof(*sp)); 2336 return GenericJniMethodEnd(self, cookie, result, result_f, called, table); 2337} 2338 2339// We use TwoWordReturn to optimize scalar returns. We use the hi value for code, and the lo value 2340// for the method pointer. 2341// 2342// It is valid to use this, as at the usage points here (returns from C functions) we are assuming 2343// to hold the mutator lock (see REQUIRES_SHARED(Locks::mutator_lock_) annotations). 2344 2345template <InvokeType type, bool access_check> 2346static TwoWordReturn artInvokeCommon(uint32_t method_idx, 2347 ObjPtr<mirror::Object> this_object, 2348 Thread* self, 2349 ArtMethod** sp) { 2350 ScopedQuickEntrypointChecks sqec(self); 2351 DCHECK_EQ(*sp, Runtime::Current()->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsAndArgs)); 2352 ArtMethod* caller_method = QuickArgumentVisitor::GetCallingMethod(sp); 2353 ArtMethod* method = FindMethodFast<type, access_check>(method_idx, this_object, caller_method); 2354 if (UNLIKELY(method == nullptr)) { 2355 const DexFile* dex_file = caller_method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 2356 uint32_t shorty_len; 2357 const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(method_idx), &shorty_len); 2358 { 2359 // Remember the args in case a GC happens in FindMethodFromCode. 2360 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 2361 RememberForGcArgumentVisitor visitor(sp, type == kStatic, shorty, shorty_len, &soa); 2362 visitor.VisitArguments(); 2363 method = FindMethodFromCode<type, access_check>(method_idx, 2364 &this_object, 2365 caller_method, 2366 self); 2367 visitor.FixupReferences(); 2368 } 2369 2370 if (UNLIKELY(method == nullptr)) { 2371 CHECK(self->IsExceptionPending()); 2372 return GetTwoWordFailureValue(); // Failure. 2373 } 2374 } 2375 DCHECK(!self->IsExceptionPending()); 2376 const void* code = method->GetEntryPointFromQuickCompiledCode(); 2377 2378 // When we return, the caller will branch to this address, so it had better not be 0! 2379 DCHECK(code != nullptr) << "Code was null in method: " << method->PrettyMethod() 2380 << " location: " 2381 << method->GetDexFile()->GetLocation(); 2382 2383 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 2384 reinterpret_cast<uintptr_t>(method)); 2385} 2386 2387// Explicit artInvokeCommon template function declarations to please analysis tool. 2388#define EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(type, access_check) \ 2389 template REQUIRES_SHARED(Locks::mutator_lock_) \ 2390 TwoWordReturn artInvokeCommon<type, access_check>( \ 2391 uint32_t method_idx, ObjPtr<mirror::Object> his_object, Thread* self, ArtMethod** sp) 2392 2393EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, false); 2394EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, true); 2395EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, false); 2396EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, true); 2397EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, false); 2398EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, true); 2399EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, false); 2400EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, true); 2401EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, false); 2402EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, true); 2403#undef EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL 2404 2405// See comments in runtime_support_asm.S 2406extern "C" TwoWordReturn artInvokeInterfaceTrampolineWithAccessCheck( 2407 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2408 REQUIRES_SHARED(Locks::mutator_lock_) { 2409 return artInvokeCommon<kInterface, true>(method_idx, this_object, self, sp); 2410} 2411 2412extern "C" TwoWordReturn artInvokeDirectTrampolineWithAccessCheck( 2413 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2414 REQUIRES_SHARED(Locks::mutator_lock_) { 2415 return artInvokeCommon<kDirect, true>(method_idx, this_object, self, sp); 2416} 2417 2418extern "C" TwoWordReturn artInvokeStaticTrampolineWithAccessCheck( 2419 uint32_t method_idx, 2420 mirror::Object* this_object ATTRIBUTE_UNUSED, 2421 Thread* self, 2422 ArtMethod** sp) REQUIRES_SHARED(Locks::mutator_lock_) { 2423 // For static, this_object is not required and may be random garbage. Don't pass it down so that 2424 // it doesn't cause ObjPtr alignment failure check. 2425 return artInvokeCommon<kStatic, true>(method_idx, nullptr, self, sp); 2426} 2427 2428extern "C" TwoWordReturn artInvokeSuperTrampolineWithAccessCheck( 2429 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2430 REQUIRES_SHARED(Locks::mutator_lock_) { 2431 return artInvokeCommon<kSuper, true>(method_idx, this_object, self, sp); 2432} 2433 2434extern "C" TwoWordReturn artInvokeVirtualTrampolineWithAccessCheck( 2435 uint32_t method_idx, mirror::Object* this_object, Thread* self, ArtMethod** sp) 2436 REQUIRES_SHARED(Locks::mutator_lock_) { 2437 return artInvokeCommon<kVirtual, true>(method_idx, this_object, self, sp); 2438} 2439 2440// Helper function for art_quick_imt_conflict_trampoline to look up the interface method. 2441extern "C" ArtMethod* artLookupResolvedMethod(uint32_t method_index, ArtMethod* referrer) 2442 REQUIRES_SHARED(Locks::mutator_lock_) { 2443 ScopedAssertNoThreadSuspension ants(__FUNCTION__); 2444 DCHECK(!referrer->IsProxyMethod()); 2445 ArtMethod* result = Runtime::Current()->GetClassLinker()->LookupResolvedMethod( 2446 method_index, referrer->GetDexCache(), referrer->GetClassLoader()); 2447 DCHECK(result == nullptr || 2448 result->GetDeclaringClass()->IsInterface() || 2449 result->GetDeclaringClass() == 2450 WellKnownClasses::ToClass(WellKnownClasses::java_lang_Object)) 2451 << result->PrettyMethod(); 2452 return result; 2453} 2454 2455// Determine target of interface dispatch. The interface method and this object are known non-null. 2456// The interface method is the method returned by the dex cache in the conflict trampoline. 2457extern "C" TwoWordReturn artInvokeInterfaceTrampoline(ArtMethod* interface_method, 2458 mirror::Object* raw_this_object, 2459 Thread* self, 2460 ArtMethod** sp) 2461 REQUIRES_SHARED(Locks::mutator_lock_) { 2462 ScopedQuickEntrypointChecks sqec(self); 2463 StackHandleScope<2> hs(self); 2464 Handle<mirror::Object> this_object = hs.NewHandle(raw_this_object); 2465 Handle<mirror::Class> cls = hs.NewHandle(this_object->GetClass()); 2466 2467 ArtMethod* caller_method = QuickArgumentVisitor::GetCallingMethod(sp); 2468 ArtMethod* method = nullptr; 2469 ImTable* imt = cls->GetImt(kRuntimePointerSize); 2470 2471 if (UNLIKELY(interface_method == nullptr)) { 2472 // The interface method is unresolved, so resolve it in the dex file of the caller. 2473 // Fetch the dex_method_idx of the target interface method from the caller. 2474 uint32_t dex_method_idx; 2475 uint32_t dex_pc = QuickArgumentVisitor::GetCallingDexPc(sp); 2476 const DexFile::CodeItem* code_item = caller_method->GetCodeItem(); 2477 DCHECK_LT(dex_pc, code_item->insns_size_in_code_units_); 2478 const Instruction& instr = code_item->InstructionAt(dex_pc); 2479 Instruction::Code instr_code = instr.Opcode(); 2480 DCHECK(instr_code == Instruction::INVOKE_INTERFACE || 2481 instr_code == Instruction::INVOKE_INTERFACE_RANGE) 2482 << "Unexpected call into interface trampoline: " << instr.DumpString(nullptr); 2483 if (instr_code == Instruction::INVOKE_INTERFACE) { 2484 dex_method_idx = instr.VRegB_35c(); 2485 } else { 2486 DCHECK_EQ(instr_code, Instruction::INVOKE_INTERFACE_RANGE); 2487 dex_method_idx = instr.VRegB_3rc(); 2488 } 2489 2490 const DexFile& dex_file = caller_method->GetDeclaringClass()->GetDexFile(); 2491 uint32_t shorty_len; 2492 const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(dex_method_idx), 2493 &shorty_len); 2494 { 2495 // Remember the args in case a GC happens in ClassLinker::ResolveMethod(). 2496 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 2497 RememberForGcArgumentVisitor visitor(sp, false, shorty, shorty_len, &soa); 2498 visitor.VisitArguments(); 2499 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 2500 interface_method = class_linker->ResolveMethod<ClassLinker::ResolveMode::kNoChecks>( 2501 self, dex_method_idx, caller_method, kInterface); 2502 visitor.FixupReferences(); 2503 } 2504 2505 if (UNLIKELY(interface_method == nullptr)) { 2506 CHECK(self->IsExceptionPending()); 2507 return GetTwoWordFailureValue(); // Failure. 2508 } 2509 } 2510 2511 DCHECK(!interface_method->IsRuntimeMethod()); 2512 // Look whether we have a match in the ImtConflictTable. 2513 uint32_t imt_index = ImTable::GetImtIndex(interface_method); 2514 ArtMethod* conflict_method = imt->Get(imt_index, kRuntimePointerSize); 2515 if (LIKELY(conflict_method->IsRuntimeMethod())) { 2516 ImtConflictTable* current_table = conflict_method->GetImtConflictTable(kRuntimePointerSize); 2517 DCHECK(current_table != nullptr); 2518 method = current_table->Lookup(interface_method, kRuntimePointerSize); 2519 } else { 2520 // It seems we aren't really a conflict method! 2521 if (kIsDebugBuild) { 2522 ArtMethod* m = cls->FindVirtualMethodForInterface(interface_method, kRuntimePointerSize); 2523 CHECK_EQ(conflict_method, m) 2524 << interface_method->PrettyMethod() << " / " << conflict_method->PrettyMethod() << " / " 2525 << " / " << ArtMethod::PrettyMethod(m) << " / " << cls->PrettyClass(); 2526 } 2527 method = conflict_method; 2528 } 2529 if (method != nullptr) { 2530 return GetTwoWordSuccessValue( 2531 reinterpret_cast<uintptr_t>(method->GetEntryPointFromQuickCompiledCode()), 2532 reinterpret_cast<uintptr_t>(method)); 2533 } 2534 2535 // No match, use the IfTable. 2536 method = cls->FindVirtualMethodForInterface(interface_method, kRuntimePointerSize); 2537 if (UNLIKELY(method == nullptr)) { 2538 ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch( 2539 interface_method, this_object.Get(), caller_method); 2540 return GetTwoWordFailureValue(); // Failure. 2541 } 2542 2543 // We arrive here if we have found an implementation, and it is not in the ImtConflictTable. 2544 // We create a new table with the new pair { interface_method, method }. 2545 DCHECK(conflict_method->IsRuntimeMethod()); 2546 ArtMethod* new_conflict_method = Runtime::Current()->GetClassLinker()->AddMethodToConflictTable( 2547 cls.Get(), 2548 conflict_method, 2549 interface_method, 2550 method, 2551 /*force_new_conflict_method*/false); 2552 if (new_conflict_method != conflict_method) { 2553 // Update the IMT if we create a new conflict method. No fence needed here, as the 2554 // data is consistent. 2555 imt->Set(imt_index, 2556 new_conflict_method, 2557 kRuntimePointerSize); 2558 } 2559 2560 const void* code = method->GetEntryPointFromQuickCompiledCode(); 2561 2562 // When we return, the caller will branch to this address, so it had better not be 0! 2563 DCHECK(code != nullptr) << "Code was null in method: " << method->PrettyMethod() 2564 << " location: " << method->GetDexFile()->GetLocation(); 2565 2566 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 2567 reinterpret_cast<uintptr_t>(method)); 2568} 2569 2570// Returns shorty type so the caller can determine how to put |result| 2571// into expected registers. The shorty type is static so the compiler 2572// could call different flavors of this code path depending on the 2573// shorty type though this would require different entry points for 2574// each type. 2575extern "C" uintptr_t artInvokePolymorphic( 2576 JValue* result, 2577 mirror::Object* raw_method_handle, 2578 Thread* self, 2579 ArtMethod** sp) 2580 REQUIRES_SHARED(Locks::mutator_lock_) { 2581 ScopedQuickEntrypointChecks sqec(self); 2582 DCHECK_EQ(*sp, Runtime::Current()->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsAndArgs)); 2583 2584 // Start new JNI local reference state 2585 JNIEnvExt* env = self->GetJniEnv(); 2586 ScopedObjectAccessUnchecked soa(env); 2587 ScopedJniEnvLocalRefState env_state(env); 2588 const char* old_cause = self->StartAssertNoThreadSuspension("Making stack arguments safe."); 2589 2590 // From the instruction, get the |callsite_shorty| and expose arguments on the stack to the GC. 2591 ArtMethod* caller_method = QuickArgumentVisitor::GetCallingMethod(sp); 2592 uint32_t dex_pc = QuickArgumentVisitor::GetCallingDexPc(sp); 2593 const DexFile::CodeItem* code = caller_method->GetCodeItem(); 2594 const Instruction& inst = code->InstructionAt(dex_pc); 2595 DCHECK(inst.Opcode() == Instruction::INVOKE_POLYMORPHIC || 2596 inst.Opcode() == Instruction::INVOKE_POLYMORPHIC_RANGE); 2597 const DexFile* dex_file = caller_method->GetDexFile(); 2598 const uint32_t proto_idx = inst.VRegH(); 2599 const char* shorty = dex_file->GetShorty(proto_idx); 2600 const size_t shorty_length = strlen(shorty); 2601 static const bool kMethodIsStatic = false; // invoke() and invokeExact() are not static. 2602 RememberForGcArgumentVisitor gc_visitor(sp, kMethodIsStatic, shorty, shorty_length, &soa); 2603 gc_visitor.VisitArguments(); 2604 2605 // Wrap raw_method_handle in a Handle for safety. 2606 StackHandleScope<2> hs(self); 2607 Handle<mirror::MethodHandle> method_handle( 2608 hs.NewHandle(ObjPtr<mirror::MethodHandle>::DownCast(MakeObjPtr(raw_method_handle)))); 2609 raw_method_handle = nullptr; 2610 self->EndAssertNoThreadSuspension(old_cause); 2611 2612 // Resolve method - it's either MethodHandle.invoke() or MethodHandle.invokeExact(). 2613 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2614 ArtMethod* resolved_method = linker->ResolveMethod<ClassLinker::ResolveMode::kCheckICCEAndIAE>( 2615 self, inst.VRegB(), caller_method, kVirtual); 2616 DCHECK((resolved_method == 2617 jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandle_invokeExact)) || 2618 (resolved_method == 2619 jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandle_invoke))); 2620 if (UNLIKELY(method_handle.IsNull())) { 2621 ThrowNullPointerExceptionForMethodAccess(resolved_method, InvokeType::kVirtual); 2622 return static_cast<uintptr_t>('V'); 2623 } 2624 2625 Handle<mirror::MethodType> method_type( 2626 hs.NewHandle(linker->ResolveMethodType(self, proto_idx, caller_method))); 2627 2628 // This implies we couldn't resolve one or more types in this method handle. 2629 if (UNLIKELY(method_type.IsNull())) { 2630 CHECK(self->IsExceptionPending()); 2631 return static_cast<uintptr_t>('V'); 2632 } 2633 2634 DCHECK_EQ(ArtMethod::NumArgRegisters(shorty) + 1u, (uint32_t)inst.VRegA()); 2635 DCHECK_EQ(resolved_method->IsStatic(), kMethodIsStatic); 2636 2637 // Fix references before constructing the shadow frame. 2638 gc_visitor.FixupReferences(); 2639 2640 // Construct shadow frame placing arguments consecutively from |first_arg|. 2641 const bool is_range = (inst.Opcode() == Instruction::INVOKE_POLYMORPHIC_RANGE); 2642 const size_t num_vregs = is_range ? inst.VRegA_4rcc() : inst.VRegA_45cc(); 2643 const size_t first_arg = 0; 2644 ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = 2645 CREATE_SHADOW_FRAME(num_vregs, /* link */ nullptr, resolved_method, dex_pc); 2646 ShadowFrame* shadow_frame = shadow_frame_unique_ptr.get(); 2647 ScopedStackedShadowFramePusher 2648 frame_pusher(self, shadow_frame, StackedShadowFrameType::kShadowFrameUnderConstruction); 2649 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, 2650 kMethodIsStatic, 2651 shorty, 2652 strlen(shorty), 2653 shadow_frame, 2654 first_arg); 2655 shadow_frame_builder.VisitArguments(); 2656 2657 // Push a transition back into managed code onto the linked list in thread. 2658 ManagedStack fragment; 2659 self->PushManagedStackFragment(&fragment); 2660 2661 // Call DoInvokePolymorphic with |is_range| = true, as shadow frame has argument registers in 2662 // consecutive order. 2663 uint32_t unused_args[Instruction::kMaxVarArgRegs] = {}; 2664 uint32_t first_callee_arg = first_arg + 1; 2665 if (!DoInvokePolymorphic<true /* is_range */>(self, 2666 resolved_method, 2667 *shadow_frame, 2668 method_handle, 2669 method_type, 2670 unused_args, 2671 first_callee_arg, 2672 result)) { 2673 DCHECK(self->IsExceptionPending()); 2674 } 2675 2676 // Pop transition record. 2677 self->PopManagedStackFragment(fragment); 2678 2679 return static_cast<uintptr_t>(shorty[0]); 2680} 2681 2682} // namespace art 2683