quick_trampoline_entrypoints.cc revision e2abbc604ce003c776c00ecf1293796bb4c4ac5a
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 = kArm32QuickCodeUseSoftFloat; 81 static constexpr bool kAlignPairRegister = !kArm32QuickCodeUseSoftFloat; 82 static constexpr bool kQuickSoftFloatAbi = kArm32QuickCodeUseSoftFloat; 83 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = !kArm32QuickCodeUseSoftFloat; 84 static constexpr bool kQuickSkipOddFpRegisters = false; 85 static constexpr size_t kNumQuickGprArgs = 3; 86 static constexpr size_t kNumQuickFprArgs = kArm32QuickCodeUseSoftFloat ? 0 : 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 701extern "C" uint64_t artQuickToInterpreterBridge(ArtMethod* method, Thread* self, ArtMethod** sp) 702 REQUIRES_SHARED(Locks::mutator_lock_) { 703 // Ensure we don't get thread suspension until the object arguments are safely in the shadow 704 // frame. 705 ScopedQuickEntrypointChecks sqec(self); 706 707 if (UNLIKELY(!method->IsInvokable())) { 708 method->ThrowInvocationTimeError(); 709 return 0; 710 } 711 712 JValue tmp_value; 713 ShadowFrame* deopt_frame = self->PopStackedShadowFrame( 714 StackedShadowFrameType::kDeoptimizationShadowFrame, false); 715 ManagedStack fragment; 716 717 DCHECK(!method->IsNative()) << method->PrettyMethod(); 718 uint32_t shorty_len = 0; 719 ArtMethod* non_proxy_method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize); 720 const DexFile::CodeItem* code_item = non_proxy_method->GetCodeItem(); 721 DCHECK(code_item != nullptr) << method->PrettyMethod(); 722 const char* shorty = non_proxy_method->GetShorty(&shorty_len); 723 724 JValue result; 725 726 if (deopt_frame != nullptr) { 727 // Coming from partial-fragment deopt. 728 729 if (kIsDebugBuild) { 730 // Sanity-check: are the methods as expected? We check that the last shadow frame (the bottom 731 // of the call-stack) corresponds to the called method. 732 ShadowFrame* linked = deopt_frame; 733 while (linked->GetLink() != nullptr) { 734 linked = linked->GetLink(); 735 } 736 CHECK_EQ(method, linked->GetMethod()) << method->PrettyMethod() << " " 737 << ArtMethod::PrettyMethod(linked->GetMethod()); 738 } 739 740 if (VLOG_IS_ON(deopt)) { 741 // Print out the stack to verify that it was a partial-fragment deopt. 742 LOG(INFO) << "Continue-ing from deopt. Stack is:"; 743 QuickExceptionHandler::DumpFramesWithType(self, true); 744 } 745 746 ObjPtr<mirror::Throwable> pending_exception; 747 bool from_code = false; 748 DeoptimizationMethodType method_type; 749 self->PopDeoptimizationContext(/* out */ &result, 750 /* out */ &pending_exception, 751 /* out */ &from_code, 752 /* out */ &method_type); 753 754 // Push a transition back into managed code onto the linked list in thread. 755 self->PushManagedStackFragment(&fragment); 756 757 // Ensure that the stack is still in order. 758 if (kIsDebugBuild) { 759 class DummyStackVisitor : public StackVisitor { 760 public: 761 explicit DummyStackVisitor(Thread* self_in) REQUIRES_SHARED(Locks::mutator_lock_) 762 : StackVisitor(self_in, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {} 763 764 bool VisitFrame() OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) { 765 // Nothing to do here. In a debug build, SanityCheckFrame will do the work in the walking 766 // logic. Just always say we want to continue. 767 return true; 768 } 769 }; 770 DummyStackVisitor dsv(self); 771 dsv.WalkStack(); 772 } 773 774 // Restore the exception that was pending before deoptimization then interpret the 775 // deoptimized frames. 776 if (pending_exception != nullptr) { 777 self->SetException(pending_exception); 778 } 779 interpreter::EnterInterpreterFromDeoptimize(self, 780 deopt_frame, 781 &result, 782 from_code, 783 DeoptimizationMethodType::kDefault); 784 } else { 785 const char* old_cause = self->StartAssertNoThreadSuspension( 786 "Building interpreter shadow frame"); 787 uint16_t num_regs = code_item->registers_size_; 788 // No last shadow coming from quick. 789 ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = 790 CREATE_SHADOW_FRAME(num_regs, /* link */ nullptr, method, /* dex pc */ 0); 791 ShadowFrame* shadow_frame = shadow_frame_unique_ptr.get(); 792 size_t first_arg_reg = code_item->registers_size_ - code_item->ins_size_; 793 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, method->IsStatic(), shorty, shorty_len, 794 shadow_frame, first_arg_reg); 795 shadow_frame_builder.VisitArguments(); 796 const bool needs_initialization = 797 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 798 // Push a transition back into managed code onto the linked list in thread. 799 self->PushManagedStackFragment(&fragment); 800 self->PushShadowFrame(shadow_frame); 801 self->EndAssertNoThreadSuspension(old_cause); 802 803 if (needs_initialization) { 804 // Ensure static method's class is initialized. 805 StackHandleScope<1> hs(self); 806 Handle<mirror::Class> h_class(hs.NewHandle(shadow_frame->GetMethod()->GetDeclaringClass())); 807 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) { 808 DCHECK(Thread::Current()->IsExceptionPending()) 809 << shadow_frame->GetMethod()->PrettyMethod(); 810 self->PopManagedStackFragment(fragment); 811 return 0; 812 } 813 } 814 815 result = interpreter::EnterInterpreterFromEntryPoint(self, code_item, shadow_frame); 816 } 817 818 // Pop transition. 819 self->PopManagedStackFragment(fragment); 820 821 // Request a stack deoptimization if needed 822 ArtMethod* caller = QuickArgumentVisitor::GetCallingMethod(sp); 823 uintptr_t caller_pc = QuickArgumentVisitor::GetCallingPc(sp); 824 // If caller_pc is the instrumentation exit stub, the stub will check to see if deoptimization 825 // should be done and it knows the real return pc. 826 if (UNLIKELY(caller_pc != reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc()) && 827 Dbg::IsForcedInterpreterNeededForUpcall(self, caller))) { 828 if (!Runtime::Current()->IsAsyncDeoptimizeable(caller_pc)) { 829 LOG(WARNING) << "Got a deoptimization request on un-deoptimizable method " 830 << caller->PrettyMethod(); 831 } else { 832 // Push the context of the deoptimization stack so we can restore the return value and the 833 // exception before executing the deoptimized frames. 834 self->PushDeoptimizationContext( 835 result, 836 shorty[0] == 'L' || shorty[0] == '[', /* class or array */ 837 self->GetException(), 838 false /* from_code */, 839 DeoptimizationMethodType::kDefault); 840 841 // Set special exception to cause deoptimization. 842 self->SetException(Thread::GetDeoptimizationException()); 843 } 844 } 845 846 // No need to restore the args since the method has already been run by the interpreter. 847 return result.GetJ(); 848} 849 850// Visits arguments on the stack placing them into the args vector, Object* arguments are converted 851// to jobjects. 852class BuildQuickArgumentVisitor FINAL : public QuickArgumentVisitor { 853 public: 854 BuildQuickArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, uint32_t shorty_len, 855 ScopedObjectAccessUnchecked* soa, std::vector<jvalue>* args) : 856 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa), args_(args) {} 857 858 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 859 860 void FixupReferences() REQUIRES_SHARED(Locks::mutator_lock_); 861 862 private: 863 ScopedObjectAccessUnchecked* const soa_; 864 std::vector<jvalue>* const args_; 865 // References which we must update when exiting in case the GC moved the objects. 866 std::vector<std::pair<jobject, StackReference<mirror::Object>*>> references_; 867 868 DISALLOW_COPY_AND_ASSIGN(BuildQuickArgumentVisitor); 869}; 870 871void BuildQuickArgumentVisitor::Visit() { 872 jvalue val; 873 Primitive::Type type = GetParamPrimitiveType(); 874 switch (type) { 875 case Primitive::kPrimNot: { 876 StackReference<mirror::Object>* stack_ref = 877 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 878 val.l = soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 879 references_.push_back(std::make_pair(val.l, stack_ref)); 880 break; 881 } 882 case Primitive::kPrimLong: // Fall-through. 883 case Primitive::kPrimDouble: 884 if (IsSplitLongOrDouble()) { 885 val.j = ReadSplitLongParam(); 886 } else { 887 val.j = *reinterpret_cast<jlong*>(GetParamAddress()); 888 } 889 break; 890 case Primitive::kPrimBoolean: // Fall-through. 891 case Primitive::kPrimByte: // Fall-through. 892 case Primitive::kPrimChar: // Fall-through. 893 case Primitive::kPrimShort: // Fall-through. 894 case Primitive::kPrimInt: // Fall-through. 895 case Primitive::kPrimFloat: 896 val.i = *reinterpret_cast<jint*>(GetParamAddress()); 897 break; 898 case Primitive::kPrimVoid: 899 LOG(FATAL) << "UNREACHABLE"; 900 UNREACHABLE(); 901 } 902 args_->push_back(val); 903} 904 905void BuildQuickArgumentVisitor::FixupReferences() { 906 // Fixup any references which may have changed. 907 for (const auto& pair : references_) { 908 pair.second->Assign(soa_->Decode<mirror::Object>(pair.first)); 909 soa_->Env()->DeleteLocalRef(pair.first); 910 } 911} 912// Handler for invocation on proxy methods. On entry a frame will exist for the proxy object method 913// which is responsible for recording callee save registers. We explicitly place into jobjects the 914// incoming reference arguments (so they survive GC). We invoke the invocation handler, which is a 915// field within the proxy object, which will box the primitive arguments and deal with error cases. 916extern "C" uint64_t artQuickProxyInvokeHandler( 917 ArtMethod* proxy_method, mirror::Object* receiver, Thread* self, ArtMethod** sp) 918 REQUIRES_SHARED(Locks::mutator_lock_) { 919 DCHECK(proxy_method->IsProxyMethod()) << proxy_method->PrettyMethod(); 920 DCHECK(receiver->GetClass()->IsProxyClass()) << proxy_method->PrettyMethod(); 921 // Ensure we don't get thread suspension until the object arguments are safely in jobjects. 922 const char* old_cause = 923 self->StartAssertNoThreadSuspension("Adding to IRT proxy object arguments"); 924 // Register the top of the managed stack, making stack crawlable. 925 DCHECK_EQ((*sp), proxy_method) << proxy_method->PrettyMethod(); 926 self->VerifyStack(); 927 // Start new JNI local reference state. 928 JNIEnvExt* env = self->GetJniEnv(); 929 ScopedObjectAccessUnchecked soa(env); 930 ScopedJniEnvLocalRefState env_state(env); 931 // Create local ref. copies of proxy method and the receiver. 932 jobject rcvr_jobj = soa.AddLocalReference<jobject>(receiver); 933 934 // Placing arguments into args vector and remove the receiver. 935 ArtMethod* non_proxy_method = proxy_method->GetInterfaceMethodIfProxy(kRuntimePointerSize); 936 CHECK(!non_proxy_method->IsStatic()) << proxy_method->PrettyMethod() << " " 937 << non_proxy_method->PrettyMethod(); 938 std::vector<jvalue> args; 939 uint32_t shorty_len = 0; 940 const char* shorty = non_proxy_method->GetShorty(&shorty_len); 941 BuildQuickArgumentVisitor local_ref_visitor(sp, false, shorty, shorty_len, &soa, &args); 942 943 local_ref_visitor.VisitArguments(); 944 DCHECK_GT(args.size(), 0U) << proxy_method->PrettyMethod(); 945 args.erase(args.begin()); 946 947 // Convert proxy method into expected interface method. 948 ArtMethod* interface_method = proxy_method->FindOverriddenMethod(kRuntimePointerSize); 949 DCHECK(interface_method != nullptr) << proxy_method->PrettyMethod(); 950 DCHECK(!interface_method->IsProxyMethod()) << interface_method->PrettyMethod(); 951 self->EndAssertNoThreadSuspension(old_cause); 952 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 953 DCHECK(!Runtime::Current()->IsActiveTransaction()); 954 jobject interface_method_jobj = soa.AddLocalReference<jobject>( 955 mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), 956 interface_method)); 957 958 // All naked Object*s should now be in jobjects, so its safe to go into the main invoke code 959 // that performs allocations. 960 JValue result = InvokeProxyInvocationHandler(soa, shorty, rcvr_jobj, interface_method_jobj, args); 961 // Restore references which might have moved. 962 local_ref_visitor.FixupReferences(); 963 return result.GetJ(); 964} 965 966// Read object references held in arguments from quick frames and place in a JNI local references, 967// so they don't get garbage collected. 968class RememberForGcArgumentVisitor FINAL : public QuickArgumentVisitor { 969 public: 970 RememberForGcArgumentVisitor(ArtMethod** sp, bool is_static, const char* shorty, 971 uint32_t shorty_len, ScopedObjectAccessUnchecked* soa) : 972 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa) {} 973 974 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 975 976 void FixupReferences() REQUIRES_SHARED(Locks::mutator_lock_); 977 978 private: 979 ScopedObjectAccessUnchecked* const soa_; 980 // References which we must update when exiting in case the GC moved the objects. 981 std::vector<std::pair<jobject, StackReference<mirror::Object>*> > references_; 982 983 DISALLOW_COPY_AND_ASSIGN(RememberForGcArgumentVisitor); 984}; 985 986void RememberForGcArgumentVisitor::Visit() { 987 if (IsParamAReference()) { 988 StackReference<mirror::Object>* stack_ref = 989 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 990 jobject reference = 991 soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 992 references_.push_back(std::make_pair(reference, stack_ref)); 993 } 994} 995 996void RememberForGcArgumentVisitor::FixupReferences() { 997 // Fixup any references which may have changed. 998 for (const auto& pair : references_) { 999 pair.second->Assign(soa_->Decode<mirror::Object>(pair.first)); 1000 soa_->Env()->DeleteLocalRef(pair.first); 1001 } 1002} 1003 1004extern "C" const void* artInstrumentationMethodEntryFromCode(ArtMethod* method, 1005 mirror::Object* this_object, 1006 Thread* self, 1007 ArtMethod** sp) 1008 REQUIRES_SHARED(Locks::mutator_lock_) { 1009 const void* result; 1010 // Instrumentation changes the stack. Thus, when exiting, the stack cannot be verified, so skip 1011 // that part. 1012 ScopedQuickEntrypointChecks sqec(self, kIsDebugBuild, false); 1013 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 1014 if (instrumentation->IsDeoptimized(method)) { 1015 result = GetQuickToInterpreterBridge(); 1016 } else { 1017 result = instrumentation->GetQuickCodeFor(method, kRuntimePointerSize); 1018 DCHECK(!Runtime::Current()->GetClassLinker()->IsQuickToInterpreterBridge(result)); 1019 } 1020 1021 bool interpreter_entry = (result == GetQuickToInterpreterBridge()); 1022 bool is_static = method->IsStatic(); 1023 uint32_t shorty_len; 1024 const char* shorty = 1025 method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len); 1026 1027 ScopedObjectAccessUnchecked soa(self); 1028 RememberForGcArgumentVisitor visitor(sp, is_static, shorty, shorty_len, &soa); 1029 visitor.VisitArguments(); 1030 1031 instrumentation->PushInstrumentationStackFrame(self, 1032 is_static ? nullptr : this_object, 1033 method, 1034 QuickArgumentVisitor::GetCallingPc(sp), 1035 interpreter_entry); 1036 1037 visitor.FixupReferences(); 1038 if (UNLIKELY(self->IsExceptionPending())) { 1039 return nullptr; 1040 } 1041 CHECK(result != nullptr) << method->PrettyMethod(); 1042 return result; 1043} 1044 1045extern "C" TwoWordReturn artInstrumentationMethodExitFromCode(Thread* self, 1046 ArtMethod** sp, 1047 uint64_t* gpr_result, 1048 uint64_t* fpr_result) 1049 REQUIRES_SHARED(Locks::mutator_lock_) { 1050 DCHECK_EQ(reinterpret_cast<uintptr_t>(self), reinterpret_cast<uintptr_t>(Thread::Current())); 1051 CHECK(gpr_result != nullptr); 1052 CHECK(fpr_result != nullptr); 1053 // Instrumentation exit stub must not be entered with a pending exception. 1054 CHECK(!self->IsExceptionPending()) << "Enter instrumentation exit stub with pending exception " 1055 << self->GetException()->Dump(); 1056 // Compute address of return PC and sanity check that it currently holds 0. 1057 size_t return_pc_offset = GetCalleeSaveReturnPcOffset(kRuntimeISA, 1058 CalleeSaveType::kSaveEverything); 1059 uintptr_t* return_pc = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(sp) + 1060 return_pc_offset); 1061 CHECK_EQ(*return_pc, 0U); 1062 1063 // Pop the frame filling in the return pc. The low half of the return value is 0 when 1064 // deoptimization shouldn't be performed with the high-half having the return address. When 1065 // deoptimization should be performed the low half is zero and the high-half the address of the 1066 // deoptimization entry point. 1067 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 1068 TwoWordReturn return_or_deoptimize_pc = instrumentation->PopInstrumentationStackFrame( 1069 self, return_pc, gpr_result, fpr_result); 1070 if (self->IsExceptionPending()) { 1071 return GetTwoWordFailureValue(); 1072 } 1073 return return_or_deoptimize_pc; 1074} 1075 1076// Lazily resolve a method for quick. Called by stub code. 1077extern "C" const void* artQuickResolutionTrampoline( 1078 ArtMethod* called, mirror::Object* receiver, Thread* self, ArtMethod** sp) 1079 REQUIRES_SHARED(Locks::mutator_lock_) { 1080 // The resolution trampoline stashes the resolved method into the callee-save frame to transport 1081 // it. Thus, when exiting, the stack cannot be verified (as the resolved method most likely 1082 // does not have the same stack layout as the callee-save method). 1083 ScopedQuickEntrypointChecks sqec(self, kIsDebugBuild, false); 1084 // Start new JNI local reference state 1085 JNIEnvExt* env = self->GetJniEnv(); 1086 ScopedObjectAccessUnchecked soa(env); 1087 ScopedJniEnvLocalRefState env_state(env); 1088 const char* old_cause = self->StartAssertNoThreadSuspension("Quick method resolution set up"); 1089 1090 // Compute details about the called method (avoid GCs) 1091 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 1092 InvokeType invoke_type; 1093 MethodReference called_method(nullptr, 0); 1094 const bool called_method_known_on_entry = !called->IsRuntimeMethod(); 1095 ArtMethod* caller = nullptr; 1096 if (!called_method_known_on_entry) { 1097 caller = QuickArgumentVisitor::GetCallingMethod(sp); 1098 called_method.dex_file = caller->GetDexFile(); 1099 1100 InvokeType stack_map_invoke_type; 1101 uint32_t stack_map_dex_method_idx; 1102 const bool found_stack_map = QuickArgumentVisitor::GetInvokeType(sp, 1103 &stack_map_invoke_type, 1104 &stack_map_dex_method_idx); 1105 // For debug builds, we make sure both of the paths are consistent by also looking at the dex 1106 // code. 1107 if (!found_stack_map || kIsDebugBuild) { 1108 uint32_t dex_pc = QuickArgumentVisitor::GetCallingDexPc(sp); 1109 const DexFile::CodeItem* code; 1110 code = caller->GetCodeItem(); 1111 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 1112 const Instruction* instr = Instruction::At(&code->insns_[dex_pc]); 1113 Instruction::Code instr_code = instr->Opcode(); 1114 bool is_range; 1115 switch (instr_code) { 1116 case Instruction::INVOKE_DIRECT: 1117 invoke_type = kDirect; 1118 is_range = false; 1119 break; 1120 case Instruction::INVOKE_DIRECT_RANGE: 1121 invoke_type = kDirect; 1122 is_range = true; 1123 break; 1124 case Instruction::INVOKE_STATIC: 1125 invoke_type = kStatic; 1126 is_range = false; 1127 break; 1128 case Instruction::INVOKE_STATIC_RANGE: 1129 invoke_type = kStatic; 1130 is_range = true; 1131 break; 1132 case Instruction::INVOKE_SUPER: 1133 invoke_type = kSuper; 1134 is_range = false; 1135 break; 1136 case Instruction::INVOKE_SUPER_RANGE: 1137 invoke_type = kSuper; 1138 is_range = true; 1139 break; 1140 case Instruction::INVOKE_VIRTUAL: 1141 invoke_type = kVirtual; 1142 is_range = false; 1143 break; 1144 case Instruction::INVOKE_VIRTUAL_RANGE: 1145 invoke_type = kVirtual; 1146 is_range = true; 1147 break; 1148 case Instruction::INVOKE_INTERFACE: 1149 invoke_type = kInterface; 1150 is_range = false; 1151 break; 1152 case Instruction::INVOKE_INTERFACE_RANGE: 1153 invoke_type = kInterface; 1154 is_range = true; 1155 break; 1156 default: 1157 LOG(FATAL) << "Unexpected call into trampoline: " << instr->DumpString(nullptr); 1158 UNREACHABLE(); 1159 } 1160 called_method.dex_method_index = (is_range) ? instr->VRegB_3rc() : instr->VRegB_35c(); 1161 // Check that the invoke matches what we expected, note that this path only happens for debug 1162 // builds. 1163 if (found_stack_map) { 1164 DCHECK_EQ(stack_map_invoke_type, invoke_type); 1165 if (invoke_type != kSuper) { 1166 // Super may be sharpened. 1167 DCHECK_EQ(stack_map_dex_method_idx, called_method.dex_method_index) 1168 << called_method.dex_file->PrettyMethod(stack_map_dex_method_idx) << " " 1169 << called_method.dex_file->PrettyMethod(called_method.dex_method_index); 1170 } 1171 } else { 1172 VLOG(dex) << "Accessed dex file for invoke " << invoke_type << " " 1173 << called_method.dex_method_index; 1174 } 1175 } else { 1176 invoke_type = stack_map_invoke_type; 1177 called_method.dex_method_index = stack_map_dex_method_idx; 1178 } 1179 } else { 1180 invoke_type = kStatic; 1181 called_method.dex_file = called->GetDexFile(); 1182 called_method.dex_method_index = called->GetDexMethodIndex(); 1183 } 1184 uint32_t shorty_len; 1185 const char* shorty = 1186 called_method.dex_file->GetMethodShorty( 1187 called_method.dex_file->GetMethodId(called_method.dex_method_index), &shorty_len); 1188 RememberForGcArgumentVisitor visitor(sp, invoke_type == kStatic, shorty, shorty_len, &soa); 1189 visitor.VisitArguments(); 1190 self->EndAssertNoThreadSuspension(old_cause); 1191 const bool virtual_or_interface = invoke_type == kVirtual || invoke_type == kInterface; 1192 // Resolve method filling in dex cache. 1193 if (!called_method_known_on_entry) { 1194 StackHandleScope<1> hs(self); 1195 mirror::Object* dummy = nullptr; 1196 HandleWrapper<mirror::Object> h_receiver( 1197 hs.NewHandleWrapper(virtual_or_interface ? &receiver : &dummy)); 1198 DCHECK_EQ(caller->GetDexFile(), called_method.dex_file); 1199 called = linker->ResolveMethod<ClassLinker::ResolveMode::kCheckICCEAndIAE>( 1200 self, called_method.dex_method_index, caller, invoke_type); 1201 1202 // Update .bss entry in oat file if any. 1203 if (called != nullptr && called_method.dex_file->GetOatDexFile() != nullptr) { 1204 const MethodBssMapping* mapping = 1205 called_method.dex_file->GetOatDexFile()->GetMethodBssMapping(); 1206 if (mapping != nullptr) { 1207 auto pp = std::partition_point( 1208 mapping->begin(), 1209 mapping->end(), 1210 [called_method](const MethodBssMappingEntry& entry) { 1211 return entry.method_index < called_method.dex_method_index; 1212 }); 1213 if (pp != mapping->end() && pp->CoversIndex(called_method.dex_method_index)) { 1214 size_t bss_offset = pp->GetBssOffset(called_method.dex_method_index, 1215 static_cast<size_t>(kRuntimePointerSize)); 1216 DCHECK_ALIGNED(bss_offset, static_cast<size_t>(kRuntimePointerSize)); 1217 const OatFile* oat_file = called_method.dex_file->GetOatDexFile()->GetOatFile(); 1218 ArtMethod** method_entry = reinterpret_cast<ArtMethod**>(const_cast<uint8_t*>( 1219 oat_file->BssBegin() + bss_offset)); 1220 DCHECK_GE(method_entry, oat_file->GetBssMethods().data()); 1221 DCHECK_LT(method_entry, 1222 oat_file->GetBssMethods().data() + oat_file->GetBssMethods().size()); 1223 *method_entry = called; 1224 } 1225 } 1226 } 1227 } 1228 const void* code = nullptr; 1229 if (LIKELY(!self->IsExceptionPending())) { 1230 // Incompatible class change should have been handled in resolve method. 1231 CHECK(!called->CheckIncompatibleClassChange(invoke_type)) 1232 << called->PrettyMethod() << " " << invoke_type; 1233 if (virtual_or_interface || invoke_type == kSuper) { 1234 // Refine called method based on receiver for kVirtual/kInterface, and 1235 // caller for kSuper. 1236 ArtMethod* orig_called = called; 1237 if (invoke_type == kVirtual) { 1238 CHECK(receiver != nullptr) << invoke_type; 1239 called = receiver->GetClass()->FindVirtualMethodForVirtual(called, kRuntimePointerSize); 1240 } else if (invoke_type == kInterface) { 1241 CHECK(receiver != nullptr) << invoke_type; 1242 called = receiver->GetClass()->FindVirtualMethodForInterface(called, kRuntimePointerSize); 1243 } else { 1244 DCHECK_EQ(invoke_type, kSuper); 1245 CHECK(caller != nullptr) << invoke_type; 1246 StackHandleScope<2> hs(self); 1247 Handle<mirror::DexCache> dex_cache( 1248 hs.NewHandle(caller->GetDeclaringClass()->GetDexCache())); 1249 Handle<mirror::ClassLoader> class_loader( 1250 hs.NewHandle(caller->GetDeclaringClass()->GetClassLoader())); 1251 // TODO Maybe put this into a mirror::Class function. 1252 ObjPtr<mirror::Class> ref_class = linker->LookupResolvedType( 1253 *dex_cache->GetDexFile(), 1254 dex_cache->GetDexFile()->GetMethodId(called_method.dex_method_index).class_idx_, 1255 dex_cache.Get(), 1256 class_loader.Get()); 1257 if (ref_class->IsInterface()) { 1258 called = ref_class->FindVirtualMethodForInterfaceSuper(called, kRuntimePointerSize); 1259 } else { 1260 called = caller->GetDeclaringClass()->GetSuperClass()->GetVTableEntry( 1261 called->GetMethodIndex(), kRuntimePointerSize); 1262 } 1263 } 1264 1265 CHECK(called != nullptr) << orig_called->PrettyMethod() << " " 1266 << mirror::Object::PrettyTypeOf(receiver) << " " 1267 << invoke_type << " " << orig_called->GetVtableIndex(); 1268 } 1269 1270 // Ensure that the called method's class is initialized. 1271 StackHandleScope<1> hs(soa.Self()); 1272 Handle<mirror::Class> called_class(hs.NewHandle(called->GetDeclaringClass())); 1273 linker->EnsureInitialized(soa.Self(), called_class, true, true); 1274 if (LIKELY(called_class->IsInitialized())) { 1275 if (UNLIKELY(Dbg::IsForcedInterpreterNeededForResolution(self, called))) { 1276 // If we are single-stepping or the called method is deoptimized (by a 1277 // breakpoint, for example), then we have to execute the called method 1278 // with the interpreter. 1279 code = GetQuickToInterpreterBridge(); 1280 } else if (UNLIKELY(Dbg::IsForcedInstrumentationNeededForResolution(self, caller))) { 1281 // If the caller is deoptimized (by a breakpoint, for example), we have to 1282 // continue its execution with interpreter when returning from the called 1283 // method. Because we do not want to execute the called method with the 1284 // interpreter, we wrap its execution into the instrumentation stubs. 1285 // When the called method returns, it will execute the instrumentation 1286 // exit hook that will determine the need of the interpreter with a call 1287 // to Dbg::IsForcedInterpreterNeededForUpcall and deoptimize the stack if 1288 // it is needed. 1289 code = GetQuickInstrumentationEntryPoint(); 1290 } else { 1291 code = called->GetEntryPointFromQuickCompiledCode(); 1292 } 1293 } else if (called_class->IsInitializing()) { 1294 if (UNLIKELY(Dbg::IsForcedInterpreterNeededForResolution(self, called))) { 1295 // If we are single-stepping or the called method is deoptimized (by a 1296 // breakpoint, for example), then we have to execute the called method 1297 // with the interpreter. 1298 code = GetQuickToInterpreterBridge(); 1299 } else if (invoke_type == kStatic) { 1300 // Class is still initializing, go to oat and grab code (trampoline must be left in place 1301 // until class is initialized to stop races between threads). 1302 code = linker->GetQuickOatCodeFor(called); 1303 } else { 1304 // No trampoline for non-static methods. 1305 code = called->GetEntryPointFromQuickCompiledCode(); 1306 } 1307 } else { 1308 DCHECK(called_class->IsErroneous()); 1309 } 1310 } 1311 CHECK_EQ(code == nullptr, self->IsExceptionPending()); 1312 // Fixup any locally saved objects may have moved during a GC. 1313 visitor.FixupReferences(); 1314 // Place called method in callee-save frame to be placed as first argument to quick method. 1315 *sp = called; 1316 1317 return code; 1318} 1319 1320/* 1321 * This class uses a couple of observations to unite the different calling conventions through 1322 * a few constants. 1323 * 1324 * 1) Number of registers used for passing is normally even, so counting down has no penalty for 1325 * possible alignment. 1326 * 2) Known 64b architectures store 8B units on the stack, both for integral and floating point 1327 * types, so using uintptr_t is OK. Also means that we can use kRegistersNeededX to denote 1328 * when we have to split things 1329 * 3) The only soft-float, Arm, is 32b, so no widening needs to be taken into account for floats 1330 * and we can use Int handling directly. 1331 * 4) Only 64b architectures widen, and their stack is aligned 8B anyways, so no padding code 1332 * necessary when widening. Also, widening of Ints will take place implicitly, and the 1333 * extension should be compatible with Aarch64, which mandates copying the available bits 1334 * into LSB and leaving the rest unspecified. 1335 * 5) Aligning longs and doubles is necessary on arm only, and it's the same in registers and on 1336 * the stack. 1337 * 6) There is only little endian. 1338 * 1339 * 1340 * Actual work is supposed to be done in a delegate of the template type. The interface is as 1341 * follows: 1342 * 1343 * void PushGpr(uintptr_t): Add a value for the next GPR 1344 * 1345 * void PushFpr4(float): Add a value for the next FPR of size 32b. Is only called if we need 1346 * padding, that is, think the architecture is 32b and aligns 64b. 1347 * 1348 * void PushFpr8(uint64_t): Push a double. We _will_ call this on 32b, it's the callee's job to 1349 * split this if necessary. The current state will have aligned, if 1350 * necessary. 1351 * 1352 * void PushStack(uintptr_t): Push a value to the stack. 1353 * 1354 * uintptr_t PushHandleScope(mirror::Object* ref): Add a reference to the HandleScope. This _will_ have nullptr, 1355 * as this might be important for null initialization. 1356 * Must return the jobject, that is, the reference to the 1357 * entry in the HandleScope (nullptr if necessary). 1358 * 1359 */ 1360template<class T> class BuildNativeCallFrameStateMachine { 1361 public: 1362#if defined(__arm__) 1363 // TODO: These are all dummy values! 1364 static constexpr bool kNativeSoftFloatAbi = true; 1365 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs, r0-r3 1366 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 1367 1368 static constexpr size_t kRegistersNeededForLong = 2; 1369 static constexpr size_t kRegistersNeededForDouble = 2; 1370 static constexpr bool kMultiRegistersAligned = true; 1371 static constexpr bool kMultiFPRegistersWidened = false; 1372 static constexpr bool kMultiGPRegistersWidened = false; 1373 static constexpr bool kAlignLongOnStack = true; 1374 static constexpr bool kAlignDoubleOnStack = true; 1375#elif defined(__aarch64__) 1376 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 1377 static constexpr size_t kNumNativeGprArgs = 8; // 6 arguments passed in GPRs. 1378 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 1379 1380 static constexpr size_t kRegistersNeededForLong = 1; 1381 static constexpr size_t kRegistersNeededForDouble = 1; 1382 static constexpr bool kMultiRegistersAligned = false; 1383 static constexpr bool kMultiFPRegistersWidened = false; 1384 static constexpr bool kMultiGPRegistersWidened = false; 1385 static constexpr bool kAlignLongOnStack = false; 1386 static constexpr bool kAlignDoubleOnStack = false; 1387#elif defined(__mips__) && !defined(__LP64__) 1388 static constexpr bool kNativeSoftFloatAbi = true; // This is a hard float ABI. 1389 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs. 1390 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 1391 1392 static constexpr size_t kRegistersNeededForLong = 2; 1393 static constexpr size_t kRegistersNeededForDouble = 2; 1394 static constexpr bool kMultiRegistersAligned = true; 1395 static constexpr bool kMultiFPRegistersWidened = true; 1396 static constexpr bool kMultiGPRegistersWidened = false; 1397 static constexpr bool kAlignLongOnStack = true; 1398 static constexpr bool kAlignDoubleOnStack = true; 1399#elif defined(__mips__) && defined(__LP64__) 1400 // Let the code prepare GPRs only and we will load the FPRs with same data. 1401 static constexpr bool kNativeSoftFloatAbi = true; 1402 static constexpr size_t kNumNativeGprArgs = 8; 1403 static constexpr size_t kNumNativeFprArgs = 0; 1404 1405 static constexpr size_t kRegistersNeededForLong = 1; 1406 static constexpr size_t kRegistersNeededForDouble = 1; 1407 static constexpr bool kMultiRegistersAligned = false; 1408 static constexpr bool kMultiFPRegistersWidened = false; 1409 static constexpr bool kMultiGPRegistersWidened = true; 1410 static constexpr bool kAlignLongOnStack = false; 1411 static constexpr bool kAlignDoubleOnStack = false; 1412#elif defined(__i386__) 1413 // TODO: Check these! 1414 static constexpr bool kNativeSoftFloatAbi = false; // Not using int registers for fp 1415 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 1416 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 1417 1418 static constexpr size_t kRegistersNeededForLong = 2; 1419 static constexpr size_t kRegistersNeededForDouble = 2; 1420 static constexpr bool kMultiRegistersAligned = false; // x86 not using regs, anyways 1421 static constexpr bool kMultiFPRegistersWidened = false; 1422 static constexpr bool kMultiGPRegistersWidened = false; 1423 static constexpr bool kAlignLongOnStack = false; 1424 static constexpr bool kAlignDoubleOnStack = false; 1425#elif defined(__x86_64__) 1426 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 1427 static constexpr size_t kNumNativeGprArgs = 6; // 6 arguments passed in GPRs. 1428 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 1429 1430 static constexpr size_t kRegistersNeededForLong = 1; 1431 static constexpr size_t kRegistersNeededForDouble = 1; 1432 static constexpr bool kMultiRegistersAligned = false; 1433 static constexpr bool kMultiFPRegistersWidened = false; 1434 static constexpr bool kMultiGPRegistersWidened = false; 1435 static constexpr bool kAlignLongOnStack = false; 1436 static constexpr bool kAlignDoubleOnStack = false; 1437#else 1438#error "Unsupported architecture" 1439#endif 1440 1441 public: 1442 explicit BuildNativeCallFrameStateMachine(T* delegate) 1443 : gpr_index_(kNumNativeGprArgs), 1444 fpr_index_(kNumNativeFprArgs), 1445 stack_entries_(0), 1446 delegate_(delegate) { 1447 // For register alignment, we want to assume that counters (gpr_index_, fpr_index_) are even iff 1448 // the next register is even; counting down is just to make the compiler happy... 1449 static_assert(kNumNativeGprArgs % 2 == 0U, "Number of native GPR arguments not even"); 1450 static_assert(kNumNativeFprArgs % 2 == 0U, "Number of native FPR arguments not even"); 1451 } 1452 1453 virtual ~BuildNativeCallFrameStateMachine() {} 1454 1455 bool HavePointerGpr() const { 1456 return gpr_index_ > 0; 1457 } 1458 1459 void AdvancePointer(const void* val) { 1460 if (HavePointerGpr()) { 1461 gpr_index_--; 1462 PushGpr(reinterpret_cast<uintptr_t>(val)); 1463 } else { 1464 stack_entries_++; // TODO: have a field for pointer length as multiple of 32b 1465 PushStack(reinterpret_cast<uintptr_t>(val)); 1466 gpr_index_ = 0; 1467 } 1468 } 1469 1470 bool HaveHandleScopeGpr() const { 1471 return gpr_index_ > 0; 1472 } 1473 1474 void AdvanceHandleScope(mirror::Object* ptr) REQUIRES_SHARED(Locks::mutator_lock_) { 1475 uintptr_t handle = PushHandle(ptr); 1476 if (HaveHandleScopeGpr()) { 1477 gpr_index_--; 1478 PushGpr(handle); 1479 } else { 1480 stack_entries_++; 1481 PushStack(handle); 1482 gpr_index_ = 0; 1483 } 1484 } 1485 1486 bool HaveIntGpr() const { 1487 return gpr_index_ > 0; 1488 } 1489 1490 void AdvanceInt(uint32_t val) { 1491 if (HaveIntGpr()) { 1492 gpr_index_--; 1493 if (kMultiGPRegistersWidened) { 1494 DCHECK_EQ(sizeof(uintptr_t), sizeof(int64_t)); 1495 PushGpr(static_cast<int64_t>(bit_cast<int32_t, uint32_t>(val))); 1496 } else { 1497 PushGpr(val); 1498 } 1499 } else { 1500 stack_entries_++; 1501 if (kMultiGPRegistersWidened) { 1502 DCHECK_EQ(sizeof(uintptr_t), sizeof(int64_t)); 1503 PushStack(static_cast<int64_t>(bit_cast<int32_t, uint32_t>(val))); 1504 } else { 1505 PushStack(val); 1506 } 1507 gpr_index_ = 0; 1508 } 1509 } 1510 1511 bool HaveLongGpr() const { 1512 return gpr_index_ >= kRegistersNeededForLong + (LongGprNeedsPadding() ? 1 : 0); 1513 } 1514 1515 bool LongGprNeedsPadding() const { 1516 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1517 kAlignLongOnStack && // and when it needs alignment 1518 (gpr_index_ & 1) == 1; // counter is odd, see constructor 1519 } 1520 1521 bool LongStackNeedsPadding() const { 1522 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1523 kAlignLongOnStack && // and when it needs 8B alignment 1524 (stack_entries_ & 1) == 1; // counter is odd 1525 } 1526 1527 void AdvanceLong(uint64_t val) { 1528 if (HaveLongGpr()) { 1529 if (LongGprNeedsPadding()) { 1530 PushGpr(0); 1531 gpr_index_--; 1532 } 1533 if (kRegistersNeededForLong == 1) { 1534 PushGpr(static_cast<uintptr_t>(val)); 1535 } else { 1536 PushGpr(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1537 PushGpr(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1538 } 1539 gpr_index_ -= kRegistersNeededForLong; 1540 } else { 1541 if (LongStackNeedsPadding()) { 1542 PushStack(0); 1543 stack_entries_++; 1544 } 1545 if (kRegistersNeededForLong == 1) { 1546 PushStack(static_cast<uintptr_t>(val)); 1547 stack_entries_++; 1548 } else { 1549 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1550 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1551 stack_entries_ += 2; 1552 } 1553 gpr_index_ = 0; 1554 } 1555 } 1556 1557 bool HaveFloatFpr() const { 1558 return fpr_index_ > 0; 1559 } 1560 1561 void AdvanceFloat(float val) { 1562 if (kNativeSoftFloatAbi) { 1563 AdvanceInt(bit_cast<uint32_t, float>(val)); 1564 } else { 1565 if (HaveFloatFpr()) { 1566 fpr_index_--; 1567 if (kRegistersNeededForDouble == 1) { 1568 if (kMultiFPRegistersWidened) { 1569 PushFpr8(bit_cast<uint64_t, double>(val)); 1570 } else { 1571 // No widening, just use the bits. 1572 PushFpr8(static_cast<uint64_t>(bit_cast<uint32_t, float>(val))); 1573 } 1574 } else { 1575 PushFpr4(val); 1576 } 1577 } else { 1578 stack_entries_++; 1579 if (kRegistersNeededForDouble == 1 && kMultiFPRegistersWidened) { 1580 // Need to widen before storing: Note the "double" in the template instantiation. 1581 // Note: We need to jump through those hoops to make the compiler happy. 1582 DCHECK_EQ(sizeof(uintptr_t), sizeof(uint64_t)); 1583 PushStack(static_cast<uintptr_t>(bit_cast<uint64_t, double>(val))); 1584 } else { 1585 PushStack(static_cast<uintptr_t>(bit_cast<uint32_t, float>(val))); 1586 } 1587 fpr_index_ = 0; 1588 } 1589 } 1590 } 1591 1592 bool HaveDoubleFpr() const { 1593 return fpr_index_ >= kRegistersNeededForDouble + (DoubleFprNeedsPadding() ? 1 : 0); 1594 } 1595 1596 bool DoubleFprNeedsPadding() const { 1597 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1598 kAlignDoubleOnStack && // and when it needs alignment 1599 (fpr_index_ & 1) == 1; // counter is odd, see constructor 1600 } 1601 1602 bool DoubleStackNeedsPadding() const { 1603 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1604 kAlignDoubleOnStack && // and when it needs 8B alignment 1605 (stack_entries_ & 1) == 1; // counter is odd 1606 } 1607 1608 void AdvanceDouble(uint64_t val) { 1609 if (kNativeSoftFloatAbi) { 1610 AdvanceLong(val); 1611 } else { 1612 if (HaveDoubleFpr()) { 1613 if (DoubleFprNeedsPadding()) { 1614 PushFpr4(0); 1615 fpr_index_--; 1616 } 1617 PushFpr8(val); 1618 fpr_index_ -= kRegistersNeededForDouble; 1619 } else { 1620 if (DoubleStackNeedsPadding()) { 1621 PushStack(0); 1622 stack_entries_++; 1623 } 1624 if (kRegistersNeededForDouble == 1) { 1625 PushStack(static_cast<uintptr_t>(val)); 1626 stack_entries_++; 1627 } else { 1628 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1629 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1630 stack_entries_ += 2; 1631 } 1632 fpr_index_ = 0; 1633 } 1634 } 1635 } 1636 1637 uint32_t GetStackEntries() const { 1638 return stack_entries_; 1639 } 1640 1641 uint32_t GetNumberOfUsedGprs() const { 1642 return kNumNativeGprArgs - gpr_index_; 1643 } 1644 1645 uint32_t GetNumberOfUsedFprs() const { 1646 return kNumNativeFprArgs - fpr_index_; 1647 } 1648 1649 private: 1650 void PushGpr(uintptr_t val) { 1651 delegate_->PushGpr(val); 1652 } 1653 void PushFpr4(float val) { 1654 delegate_->PushFpr4(val); 1655 } 1656 void PushFpr8(uint64_t val) { 1657 delegate_->PushFpr8(val); 1658 } 1659 void PushStack(uintptr_t val) { 1660 delegate_->PushStack(val); 1661 } 1662 uintptr_t PushHandle(mirror::Object* ref) REQUIRES_SHARED(Locks::mutator_lock_) { 1663 return delegate_->PushHandle(ref); 1664 } 1665 1666 uint32_t gpr_index_; // Number of free GPRs 1667 uint32_t fpr_index_; // Number of free FPRs 1668 uint32_t stack_entries_; // Stack entries are in multiples of 32b, as floats are usually not 1669 // extended 1670 T* const delegate_; // What Push implementation gets called 1671}; 1672 1673// Computes the sizes of register stacks and call stack area. Handling of references can be extended 1674// in subclasses. 1675// 1676// To handle native pointers, use "L" in the shorty for an object reference, which simulates 1677// them with handles. 1678class ComputeNativeCallFrameSize { 1679 public: 1680 ComputeNativeCallFrameSize() : num_stack_entries_(0) {} 1681 1682 virtual ~ComputeNativeCallFrameSize() {} 1683 1684 uint32_t GetStackSize() const { 1685 return num_stack_entries_ * sizeof(uintptr_t); 1686 } 1687 1688 uint8_t* LayoutCallStack(uint8_t* sp8) const { 1689 sp8 -= GetStackSize(); 1690 // Align by kStackAlignment. 1691 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1692 return sp8; 1693 } 1694 1695 uint8_t* LayoutCallRegisterStacks(uint8_t* sp8, uintptr_t** start_gpr, uint32_t** start_fpr) 1696 const { 1697 // Assumption is OK right now, as we have soft-float arm 1698 size_t fregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeFprArgs; 1699 sp8 -= fregs * sizeof(uintptr_t); 1700 *start_fpr = reinterpret_cast<uint32_t*>(sp8); 1701 size_t iregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeGprArgs; 1702 sp8 -= iregs * sizeof(uintptr_t); 1703 *start_gpr = reinterpret_cast<uintptr_t*>(sp8); 1704 return sp8; 1705 } 1706 1707 uint8_t* LayoutNativeCall(uint8_t* sp8, uintptr_t** start_stack, uintptr_t** start_gpr, 1708 uint32_t** start_fpr) const { 1709 // Native call stack. 1710 sp8 = LayoutCallStack(sp8); 1711 *start_stack = reinterpret_cast<uintptr_t*>(sp8); 1712 1713 // Put fprs and gprs below. 1714 sp8 = LayoutCallRegisterStacks(sp8, start_gpr, start_fpr); 1715 1716 // Return the new bottom. 1717 return sp8; 1718 } 1719 1720 virtual void WalkHeader( 1721 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm ATTRIBUTE_UNUSED) 1722 REQUIRES_SHARED(Locks::mutator_lock_) { 1723 } 1724 1725 void Walk(const char* shorty, uint32_t shorty_len) REQUIRES_SHARED(Locks::mutator_lock_) { 1726 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize> sm(this); 1727 1728 WalkHeader(&sm); 1729 1730 for (uint32_t i = 1; i < shorty_len; ++i) { 1731 Primitive::Type cur_type_ = Primitive::GetType(shorty[i]); 1732 switch (cur_type_) { 1733 case Primitive::kPrimNot: 1734 // TODO: fix abuse of mirror types. 1735 sm.AdvanceHandleScope( 1736 reinterpret_cast<mirror::Object*>(0x12345678)); 1737 break; 1738 1739 case Primitive::kPrimBoolean: 1740 case Primitive::kPrimByte: 1741 case Primitive::kPrimChar: 1742 case Primitive::kPrimShort: 1743 case Primitive::kPrimInt: 1744 sm.AdvanceInt(0); 1745 break; 1746 case Primitive::kPrimFloat: 1747 sm.AdvanceFloat(0); 1748 break; 1749 case Primitive::kPrimDouble: 1750 sm.AdvanceDouble(0); 1751 break; 1752 case Primitive::kPrimLong: 1753 sm.AdvanceLong(0); 1754 break; 1755 default: 1756 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty; 1757 UNREACHABLE(); 1758 } 1759 } 1760 1761 num_stack_entries_ = sm.GetStackEntries(); 1762 } 1763 1764 void PushGpr(uintptr_t /* val */) { 1765 // not optimizing registers, yet 1766 } 1767 1768 void PushFpr4(float /* val */) { 1769 // not optimizing registers, yet 1770 } 1771 1772 void PushFpr8(uint64_t /* val */) { 1773 // not optimizing registers, yet 1774 } 1775 1776 void PushStack(uintptr_t /* val */) { 1777 // counting is already done in the superclass 1778 } 1779 1780 virtual uintptr_t PushHandle(mirror::Object* /* ptr */) { 1781 return reinterpret_cast<uintptr_t>(nullptr); 1782 } 1783 1784 protected: 1785 uint32_t num_stack_entries_; 1786}; 1787 1788class ComputeGenericJniFrameSize FINAL : public ComputeNativeCallFrameSize { 1789 public: 1790 explicit ComputeGenericJniFrameSize(bool critical_native) 1791 : num_handle_scope_references_(0), critical_native_(critical_native) {} 1792 1793 // Lays out the callee-save frame. Assumes that the incorrect frame corresponding to RefsAndArgs 1794 // is at *m = sp. Will update to point to the bottom of the save frame. 1795 // 1796 // Note: assumes ComputeAll() has been run before. 1797 void LayoutCalleeSaveFrame(Thread* self, ArtMethod*** m, void* sp, HandleScope** handle_scope) 1798 REQUIRES_SHARED(Locks::mutator_lock_) { 1799 ArtMethod* method = **m; 1800 1801 DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); 1802 1803 uint8_t* sp8 = reinterpret_cast<uint8_t*>(sp); 1804 1805 // First, fix up the layout of the callee-save frame. 1806 // We have to squeeze in the HandleScope, and relocate the method pointer. 1807 1808 // "Free" the slot for the method. 1809 sp8 += sizeof(void*); // In the callee-save frame we use a full pointer. 1810 1811 // Under the callee saves put handle scope and new method stack reference. 1812 size_t handle_scope_size = HandleScope::SizeOf(num_handle_scope_references_); 1813 size_t scope_and_method = handle_scope_size + sizeof(ArtMethod*); 1814 1815 sp8 -= scope_and_method; 1816 // Align by kStackAlignment. 1817 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1818 1819 uint8_t* sp8_table = sp8 + sizeof(ArtMethod*); 1820 *handle_scope = HandleScope::Create(sp8_table, self->GetTopHandleScope(), 1821 num_handle_scope_references_); 1822 1823 // Add a slot for the method pointer, and fill it. Fix the pointer-pointer given to us. 1824 uint8_t* method_pointer = sp8; 1825 auto** new_method_ref = reinterpret_cast<ArtMethod**>(method_pointer); 1826 *new_method_ref = method; 1827 *m = new_method_ref; 1828 } 1829 1830 // Adds space for the cookie. Note: may leave stack unaligned. 1831 void LayoutCookie(uint8_t** sp) const { 1832 // Reference cookie and padding 1833 *sp -= 8; 1834 } 1835 1836 // Re-layout the callee-save frame (insert a handle-scope). Then add space for the cookie. 1837 // Returns the new bottom. Note: this may be unaligned. 1838 uint8_t* LayoutJNISaveFrame(Thread* self, ArtMethod*** m, void* sp, HandleScope** handle_scope) 1839 REQUIRES_SHARED(Locks::mutator_lock_) { 1840 // First, fix up the layout of the callee-save frame. 1841 // We have to squeeze in the HandleScope, and relocate the method pointer. 1842 LayoutCalleeSaveFrame(self, m, sp, handle_scope); 1843 1844 // The bottom of the callee-save frame is now where the method is, *m. 1845 uint8_t* sp8 = reinterpret_cast<uint8_t*>(*m); 1846 1847 // Add space for cookie. 1848 LayoutCookie(&sp8); 1849 1850 return sp8; 1851 } 1852 1853 // WARNING: After this, *sp won't be pointing to the method anymore! 1854 uint8_t* ComputeLayout(Thread* self, ArtMethod*** m, const char* shorty, uint32_t shorty_len, 1855 HandleScope** handle_scope, uintptr_t** start_stack, uintptr_t** start_gpr, 1856 uint32_t** start_fpr) 1857 REQUIRES_SHARED(Locks::mutator_lock_) { 1858 Walk(shorty, shorty_len); 1859 1860 // JNI part. 1861 uint8_t* sp8 = LayoutJNISaveFrame(self, m, reinterpret_cast<void*>(*m), handle_scope); 1862 1863 sp8 = LayoutNativeCall(sp8, start_stack, start_gpr, start_fpr); 1864 1865 // Return the new bottom. 1866 return sp8; 1867 } 1868 1869 uintptr_t PushHandle(mirror::Object* /* ptr */) OVERRIDE; 1870 1871 // Add JNIEnv* and jobj/jclass before the shorty-derived elements. 1872 void WalkHeader(BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) OVERRIDE 1873 REQUIRES_SHARED(Locks::mutator_lock_); 1874 1875 private: 1876 uint32_t num_handle_scope_references_; 1877 const bool critical_native_; 1878}; 1879 1880uintptr_t ComputeGenericJniFrameSize::PushHandle(mirror::Object* /* ptr */) { 1881 num_handle_scope_references_++; 1882 return reinterpret_cast<uintptr_t>(nullptr); 1883} 1884 1885void ComputeGenericJniFrameSize::WalkHeader( 1886 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) { 1887 // First 2 parameters are always excluded for @CriticalNative. 1888 if (UNLIKELY(critical_native_)) { 1889 return; 1890 } 1891 1892 // JNIEnv 1893 sm->AdvancePointer(nullptr); 1894 1895 // Class object or this as first argument 1896 sm->AdvanceHandleScope(reinterpret_cast<mirror::Object*>(0x12345678)); 1897} 1898 1899// Class to push values to three separate regions. Used to fill the native call part. Adheres to 1900// the template requirements of BuildGenericJniFrameStateMachine. 1901class FillNativeCall { 1902 public: 1903 FillNativeCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) : 1904 cur_gpr_reg_(gpr_regs), cur_fpr_reg_(fpr_regs), cur_stack_arg_(stack_args) {} 1905 1906 virtual ~FillNativeCall() {} 1907 1908 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) { 1909 cur_gpr_reg_ = gpr_regs; 1910 cur_fpr_reg_ = fpr_regs; 1911 cur_stack_arg_ = stack_args; 1912 } 1913 1914 void PushGpr(uintptr_t val) { 1915 *cur_gpr_reg_ = val; 1916 cur_gpr_reg_++; 1917 } 1918 1919 void PushFpr4(float val) { 1920 *cur_fpr_reg_ = val; 1921 cur_fpr_reg_++; 1922 } 1923 1924 void PushFpr8(uint64_t val) { 1925 uint64_t* tmp = reinterpret_cast<uint64_t*>(cur_fpr_reg_); 1926 *tmp = val; 1927 cur_fpr_reg_ += 2; 1928 } 1929 1930 void PushStack(uintptr_t val) { 1931 *cur_stack_arg_ = val; 1932 cur_stack_arg_++; 1933 } 1934 1935 virtual uintptr_t PushHandle(mirror::Object*) REQUIRES_SHARED(Locks::mutator_lock_) { 1936 LOG(FATAL) << "(Non-JNI) Native call does not use handles."; 1937 UNREACHABLE(); 1938 } 1939 1940 private: 1941 uintptr_t* cur_gpr_reg_; 1942 uint32_t* cur_fpr_reg_; 1943 uintptr_t* cur_stack_arg_; 1944}; 1945 1946// Visits arguments on the stack placing them into a region lower down the stack for the benefit 1947// of transitioning into native code. 1948class BuildGenericJniFrameVisitor FINAL : public QuickArgumentVisitor { 1949 public: 1950 BuildGenericJniFrameVisitor(Thread* self, 1951 bool is_static, 1952 bool critical_native, 1953 const char* shorty, 1954 uint32_t shorty_len, 1955 ArtMethod*** sp) 1956 : QuickArgumentVisitor(*sp, is_static, shorty, shorty_len), 1957 jni_call_(nullptr, nullptr, nullptr, nullptr, critical_native), 1958 sm_(&jni_call_) { 1959 ComputeGenericJniFrameSize fsc(critical_native); 1960 uintptr_t* start_gpr_reg; 1961 uint32_t* start_fpr_reg; 1962 uintptr_t* start_stack_arg; 1963 bottom_of_used_area_ = fsc.ComputeLayout(self, sp, shorty, shorty_len, 1964 &handle_scope_, 1965 &start_stack_arg, 1966 &start_gpr_reg, &start_fpr_reg); 1967 1968 jni_call_.Reset(start_gpr_reg, start_fpr_reg, start_stack_arg, handle_scope_); 1969 1970 // First 2 parameters are always excluded for CriticalNative methods. 1971 if (LIKELY(!critical_native)) { 1972 // jni environment is always first argument 1973 sm_.AdvancePointer(self->GetJniEnv()); 1974 1975 if (is_static) { 1976 sm_.AdvanceHandleScope((**sp)->GetDeclaringClass()); 1977 } // else "this" reference is already handled by QuickArgumentVisitor. 1978 } 1979 } 1980 1981 void Visit() REQUIRES_SHARED(Locks::mutator_lock_) OVERRIDE; 1982 1983 void FinalizeHandleScope(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_); 1984 1985 StackReference<mirror::Object>* GetFirstHandleScopeEntry() { 1986 return handle_scope_->GetHandle(0).GetReference(); 1987 } 1988 1989 jobject GetFirstHandleScopeJObject() const REQUIRES_SHARED(Locks::mutator_lock_) { 1990 return handle_scope_->GetHandle(0).ToJObject(); 1991 } 1992 1993 void* GetBottomOfUsedArea() const { 1994 return bottom_of_used_area_; 1995 } 1996 1997 private: 1998 // A class to fill a JNI call. Adds reference/handle-scope management to FillNativeCall. 1999 class FillJniCall FINAL : public FillNativeCall { 2000 public: 2001 FillJniCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, 2002 HandleScope* handle_scope, bool critical_native) 2003 : FillNativeCall(gpr_regs, fpr_regs, stack_args), 2004 handle_scope_(handle_scope), 2005 cur_entry_(0), 2006 critical_native_(critical_native) {} 2007 2008 uintptr_t PushHandle(mirror::Object* ref) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_); 2009 2010 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, HandleScope* scope) { 2011 FillNativeCall::Reset(gpr_regs, fpr_regs, stack_args); 2012 handle_scope_ = scope; 2013 cur_entry_ = 0U; 2014 } 2015 2016 void ResetRemainingScopeSlots() REQUIRES_SHARED(Locks::mutator_lock_) { 2017 // Initialize padding entries. 2018 size_t expected_slots = handle_scope_->NumberOfReferences(); 2019 while (cur_entry_ < expected_slots) { 2020 handle_scope_->GetMutableHandle(cur_entry_++).Assign(nullptr); 2021 } 2022 2023 if (!critical_native_) { 2024 // Non-critical natives have at least the self class (jclass) or this (jobject). 2025 DCHECK_NE(cur_entry_, 0U); 2026 } 2027 } 2028 2029 bool CriticalNative() const { 2030 return critical_native_; 2031 } 2032 2033 private: 2034 HandleScope* handle_scope_; 2035 size_t cur_entry_; 2036 const bool critical_native_; 2037 }; 2038 2039 HandleScope* handle_scope_; 2040 FillJniCall jni_call_; 2041 void* bottom_of_used_area_; 2042 2043 BuildNativeCallFrameStateMachine<FillJniCall> sm_; 2044 2045 DISALLOW_COPY_AND_ASSIGN(BuildGenericJniFrameVisitor); 2046}; 2047 2048uintptr_t BuildGenericJniFrameVisitor::FillJniCall::PushHandle(mirror::Object* ref) { 2049 uintptr_t tmp; 2050 MutableHandle<mirror::Object> h = handle_scope_->GetMutableHandle(cur_entry_); 2051 h.Assign(ref); 2052 tmp = reinterpret_cast<uintptr_t>(h.ToJObject()); 2053 cur_entry_++; 2054 return tmp; 2055} 2056 2057void BuildGenericJniFrameVisitor::Visit() { 2058 Primitive::Type type = GetParamPrimitiveType(); 2059 switch (type) { 2060 case Primitive::kPrimLong: { 2061 jlong long_arg; 2062 if (IsSplitLongOrDouble()) { 2063 long_arg = ReadSplitLongParam(); 2064 } else { 2065 long_arg = *reinterpret_cast<jlong*>(GetParamAddress()); 2066 } 2067 sm_.AdvanceLong(long_arg); 2068 break; 2069 } 2070 case Primitive::kPrimDouble: { 2071 uint64_t double_arg; 2072 if (IsSplitLongOrDouble()) { 2073 // Read into union so that we don't case to a double. 2074 double_arg = ReadSplitLongParam(); 2075 } else { 2076 double_arg = *reinterpret_cast<uint64_t*>(GetParamAddress()); 2077 } 2078 sm_.AdvanceDouble(double_arg); 2079 break; 2080 } 2081 case Primitive::kPrimNot: { 2082 StackReference<mirror::Object>* stack_ref = 2083 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 2084 sm_.AdvanceHandleScope(stack_ref->AsMirrorPtr()); 2085 break; 2086 } 2087 case Primitive::kPrimFloat: 2088 sm_.AdvanceFloat(*reinterpret_cast<float*>(GetParamAddress())); 2089 break; 2090 case Primitive::kPrimBoolean: // Fall-through. 2091 case Primitive::kPrimByte: // Fall-through. 2092 case Primitive::kPrimChar: // Fall-through. 2093 case Primitive::kPrimShort: // Fall-through. 2094 case Primitive::kPrimInt: // Fall-through. 2095 sm_.AdvanceInt(*reinterpret_cast<jint*>(GetParamAddress())); 2096 break; 2097 case Primitive::kPrimVoid: 2098 LOG(FATAL) << "UNREACHABLE"; 2099 UNREACHABLE(); 2100 } 2101} 2102 2103void BuildGenericJniFrameVisitor::FinalizeHandleScope(Thread* self) { 2104 // Clear out rest of the scope. 2105 jni_call_.ResetRemainingScopeSlots(); 2106 if (!jni_call_.CriticalNative()) { 2107 // Install HandleScope. 2108 self->PushHandleScope(handle_scope_); 2109 } 2110} 2111 2112#if defined(__arm__) || defined(__aarch64__) 2113extern "C" const void* artFindNativeMethod(); 2114#else 2115extern "C" const void* artFindNativeMethod(Thread* self); 2116#endif 2117 2118static uint64_t artQuickGenericJniEndJNIRef(Thread* self, 2119 uint32_t cookie, 2120 bool fast_native ATTRIBUTE_UNUSED, 2121 jobject l, 2122 jobject lock) { 2123 // TODO: add entrypoints for @FastNative returning objects. 2124 if (lock != nullptr) { 2125 return reinterpret_cast<uint64_t>(JniMethodEndWithReferenceSynchronized(l, cookie, lock, self)); 2126 } else { 2127 return reinterpret_cast<uint64_t>(JniMethodEndWithReference(l, cookie, self)); 2128 } 2129} 2130 2131static void artQuickGenericJniEndJNINonRef(Thread* self, 2132 uint32_t cookie, 2133 bool fast_native, 2134 jobject lock) { 2135 if (lock != nullptr) { 2136 JniMethodEndSynchronized(cookie, lock, self); 2137 // Ignore "fast_native" here because synchronized functions aren't very fast. 2138 } else { 2139 if (UNLIKELY(fast_native)) { 2140 JniMethodFastEnd(cookie, self); 2141 } else { 2142 JniMethodEnd(cookie, self); 2143 } 2144 } 2145} 2146 2147/* 2148 * Initializes an alloca region assumed to be directly below sp for a native call: 2149 * Create a HandleScope and call stack and fill a mini stack with values to be pushed to registers. 2150 * The final element on the stack is a pointer to the native code. 2151 * 2152 * On entry, the stack has a standard callee-save frame above sp, and an alloca below it. 2153 * We need to fix this, as the handle scope needs to go into the callee-save frame. 2154 * 2155 * The return of this function denotes: 2156 * 1) How many bytes of the alloca can be released, if the value is non-negative. 2157 * 2) An error, if the value is negative. 2158 */ 2159extern "C" TwoWordReturn artQuickGenericJniTrampoline(Thread* self, ArtMethod** sp) 2160 REQUIRES_SHARED(Locks::mutator_lock_) { 2161 ArtMethod* called = *sp; 2162 DCHECK(called->IsNative()) << called->PrettyMethod(true); 2163 // Fix up a callee-save frame at the bottom of the stack (at `*sp`, 2164 // above the alloca region) while we check for optimization 2165 // annotations, thus allowing stack walking until the completion of 2166 // the JNI frame creation. 2167 // 2168 // Note however that the Generic JNI trampoline does not expect 2169 // exception being thrown at that stage. 2170 *sp = Runtime::Current()->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsAndArgs); 2171 self->SetTopOfStack(sp); 2172 uint32_t shorty_len = 0; 2173 const char* shorty = called->GetShorty(&shorty_len); 2174 // Optimization annotations lookup does not try to resolve classes, 2175 // as this may throw an exception, which is not supported by the 2176 // Generic JNI trampoline at this stage; instead, method's 2177 // annotations' classes are looked up in the bootstrap class 2178 // loader's resolved types (which won't trigger an exception). 2179 bool critical_native = called->IsAnnotatedWithCriticalNative(); 2180 // ArtMethod::IsAnnotatedWithCriticalNative should not throw 2181 // an exception; clear it if it happened anyway. 2182 // TODO: Revisit this code path and turn this into a CHECK(!self->IsExceptionPending()). 2183 if (self->IsExceptionPending()) { 2184 self->ClearException(); 2185 } 2186 bool fast_native = called->IsAnnotatedWithFastNative(); 2187 // ArtMethod::IsAnnotatedWithFastNative should not throw 2188 // an exception; clear it if it happened anyway. 2189 // TODO: Revisit this code path and turn this into a CHECK(!self->IsExceptionPending()). 2190 if (self->IsExceptionPending()) { 2191 self->ClearException(); 2192 } 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 = Instruction::At(&code_item->insns_[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 = Instruction::At(&code->insns_[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<5> 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::Class> caller_class(hs.NewHandle(caller_method->GetDeclaringClass())); 2626 Handle<mirror::MethodType> method_type(hs.NewHandle(linker->ResolveMethodType( 2627 *dex_file, proto_idx, 2628 hs.NewHandle<mirror::DexCache>(caller_class->GetDexCache()), 2629 hs.NewHandle<mirror::ClassLoader>(caller_class->GetClassLoader())))); 2630 // This implies we couldn't resolve one or more types in this method handle. 2631 if (UNLIKELY(method_type.IsNull())) { 2632 CHECK(self->IsExceptionPending()); 2633 return static_cast<uintptr_t>('V'); 2634 } 2635 2636 DCHECK_EQ(ArtMethod::NumArgRegisters(shorty) + 1u, (uint32_t)inst->VRegA()); 2637 DCHECK_EQ(resolved_method->IsStatic(), kMethodIsStatic); 2638 2639 // Fix references before constructing the shadow frame. 2640 gc_visitor.FixupReferences(); 2641 2642 // Construct shadow frame placing arguments consecutively from |first_arg|. 2643 const bool is_range = (inst->Opcode() == Instruction::INVOKE_POLYMORPHIC_RANGE); 2644 const size_t num_vregs = is_range ? inst->VRegA_4rcc() : inst->VRegA_45cc(); 2645 const size_t first_arg = 0; 2646 ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = 2647 CREATE_SHADOW_FRAME(num_vregs, /* link */ nullptr, resolved_method, dex_pc); 2648 ShadowFrame* shadow_frame = shadow_frame_unique_ptr.get(); 2649 ScopedStackedShadowFramePusher 2650 frame_pusher(self, shadow_frame, StackedShadowFrameType::kShadowFrameUnderConstruction); 2651 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, 2652 kMethodIsStatic, 2653 shorty, 2654 strlen(shorty), 2655 shadow_frame, 2656 first_arg); 2657 shadow_frame_builder.VisitArguments(); 2658 2659 // Push a transition back into managed code onto the linked list in thread. 2660 ManagedStack fragment; 2661 self->PushManagedStackFragment(&fragment); 2662 2663 // Call DoInvokePolymorphic with |is_range| = true, as shadow frame has argument registers in 2664 // consecutive order. 2665 uint32_t unused_args[Instruction::kMaxVarArgRegs] = {}; 2666 uint32_t first_callee_arg = first_arg + 1; 2667 if (!DoInvokePolymorphic<true /* is_range */>(self, 2668 resolved_method, 2669 *shadow_frame, 2670 method_handle, 2671 method_type, 2672 unused_args, 2673 first_callee_arg, 2674 result)) { 2675 DCHECK(self->IsExceptionPending()); 2676 } 2677 2678 // Pop transition record. 2679 self->PopManagedStackFragment(fragment); 2680 2681 return static_cast<uintptr_t>(shorty[0]); 2682} 2683 2684} // namespace art 2685