quick_trampoline_entrypoints.cc revision 59c07060a6fbb93e455b44f00098cafb8e7e26cc
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 "callee_save_frame.h" 18#include "common_throws.h" 19#include "dex_file-inl.h" 20#include "dex_instruction-inl.h" 21#include "entrypoints/entrypoint_utils-inl.h" 22#include "gc/accounting/card_table-inl.h" 23#include "instruction_set.h" 24#include "interpreter/interpreter.h" 25#include "mirror/art_method-inl.h" 26#include "mirror/class-inl.h" 27#include "mirror/dex_cache-inl.h" 28#include "mirror/object-inl.h" 29#include "mirror/object_array-inl.h" 30#include "runtime.h" 31#include "scoped_thread_state_change.h" 32 33namespace art { 34 35// Visits the arguments as saved to the stack by a Runtime::kRefAndArgs callee save frame. 36class QuickArgumentVisitor { 37 // Number of bytes for each out register in the caller method's frame. 38 static constexpr size_t kBytesStackArgLocation = 4; 39 // Frame size in bytes of a callee-save frame for RefsAndArgs. 40 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 41 GetCalleeSaveFrameSize(kRuntimeISA, Runtime::kRefsAndArgs); 42#if defined(__arm__) 43 // The callee save frame is pointed to by SP. 44 // | argN | | 45 // | ... | | 46 // | arg4 | | 47 // | arg3 spill | | Caller's frame 48 // | arg2 spill | | 49 // | arg1 spill | | 50 // | Method* | --- 51 // | LR | 52 // | ... | callee saves 53 // | R3 | arg3 54 // | R2 | arg2 55 // | R1 | arg1 56 // | R0 | padding 57 // | Method* | <- sp 58 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 59 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 60 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 61 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 62 arm::ArmCalleeSaveFpr1Offset(Runtime::kRefsAndArgs); // Offset of first FPR arg. 63 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 64 arm::ArmCalleeSaveGpr1Offset(Runtime::kRefsAndArgs); // Offset of first GPR arg. 65 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 66 arm::ArmCalleeSaveLrOffset(Runtime::kRefsAndArgs); // Offset of return address. 67 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 68 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 69 } 70#elif defined(__aarch64__) 71 // The callee save frame is pointed to by SP. 72 // | argN | | 73 // | ... | | 74 // | arg4 | | 75 // | arg3 spill | | Caller's frame 76 // | arg2 spill | | 77 // | arg1 spill | | 78 // | Method* | --- 79 // | LR | 80 // | X29 | 81 // | : | 82 // | X20 | 83 // | X7 | 84 // | : | 85 // | X1 | 86 // | D7 | 87 // | : | 88 // | D0 | 89 // | | padding 90 // | Method* | <- sp 91 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 92 static constexpr size_t kNumQuickGprArgs = 7; // 7 arguments passed in GPRs. 93 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 94 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 95 arm64::Arm64CalleeSaveFpr1Offset(Runtime::kRefsAndArgs); // Offset of first FPR arg. 96 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 97 arm64::Arm64CalleeSaveGpr1Offset(Runtime::kRefsAndArgs); // Offset of first GPR arg. 98 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 99 arm64::Arm64CalleeSaveLrOffset(Runtime::kRefsAndArgs); // Offset of return address. 100 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 101 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 102 } 103#elif defined(__mips__) 104 // The callee save frame is pointed to by SP. 105 // | argN | | 106 // | ... | | 107 // | arg4 | | 108 // | arg3 spill | | Caller's frame 109 // | arg2 spill | | 110 // | arg1 spill | | 111 // | Method* | --- 112 // | RA | 113 // | ... | callee saves 114 // | A3 | arg3 115 // | A2 | arg2 116 // | A1 | arg1 117 // | A0/Method* | <- sp 118 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 119 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 120 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 121 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0; // Offset of first FPR arg. 122 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4; // Offset of first GPR arg. 123 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 60; // Offset of return address. 124 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 125 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 126 } 127#elif defined(__i386__) 128 // The callee save frame is pointed to by SP. 129 // | argN | | 130 // | ... | | 131 // | arg4 | | 132 // | arg3 spill | | Caller's frame 133 // | arg2 spill | | 134 // | arg1 spill | | 135 // | Method* | --- 136 // | Return | 137 // | EBP,ESI,EDI | callee saves 138 // | EBX | arg3 139 // | EDX | arg2 140 // | ECX | arg1 141 // | EAX/Method* | <- sp 142 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 143 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 144 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 145 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0; // Offset of first FPR arg. 146 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4; // Offset of first GPR arg. 147 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 28; // Offset of return address. 148 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 149 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 150 } 151#elif defined(__x86_64__) 152 // The callee save frame is pointed to by SP. 153 // | argN | | 154 // | ... | | 155 // | reg. arg spills | | Caller's frame 156 // | Method* | --- 157 // | Return | 158 // | R15 | callee save 159 // | R14 | callee save 160 // | R13 | callee save 161 // | R12 | callee save 162 // | R9 | arg5 163 // | R8 | arg4 164 // | RSI/R6 | arg1 165 // | RBP/R5 | callee save 166 // | RBX/R3 | callee save 167 // | RDX/R2 | arg2 168 // | RCX/R1 | arg3 169 // | XMM7 | float arg 8 170 // | XMM6 | float arg 7 171 // | XMM5 | float arg 6 172 // | XMM4 | float arg 5 173 // | XMM3 | float arg 4 174 // | XMM2 | float arg 3 175 // | XMM1 | float arg 2 176 // | XMM0 | float arg 1 177 // | Padding | 178 // | RDI/Method* | <- sp 179 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 180 static constexpr size_t kNumQuickGprArgs = 5; // 5 arguments passed in GPRs. 181 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 182 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 16; // Offset of first FPR arg. 183 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 80 + 4*8; // Offset of first GPR arg. 184 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 168 + 4*8; // Offset of return address. 185 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 186 switch (gpr_index) { 187 case 0: return (4 * GetBytesPerGprSpillLocation(kRuntimeISA)); 188 case 1: return (1 * GetBytesPerGprSpillLocation(kRuntimeISA)); 189 case 2: return (0 * GetBytesPerGprSpillLocation(kRuntimeISA)); 190 case 3: return (5 * GetBytesPerGprSpillLocation(kRuntimeISA)); 191 case 4: return (6 * GetBytesPerGprSpillLocation(kRuntimeISA)); 192 default: 193 LOG(FATAL) << "Unexpected GPR index: " << gpr_index; 194 return 0; 195 } 196 } 197#else 198#error "Unsupported architecture" 199#endif 200 201 public: 202 static mirror::ArtMethod* GetCallingMethod(StackReference<mirror::ArtMethod>* sp) 203 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 204 DCHECK(sp->AsMirrorPtr()->IsCalleeSaveMethod()); 205 uint8_t* previous_sp = reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize; 206 return reinterpret_cast<StackReference<mirror::ArtMethod>*>(previous_sp)->AsMirrorPtr(); 207 } 208 209 // For the given quick ref and args quick frame, return the caller's PC. 210 static uintptr_t GetCallingPc(StackReference<mirror::ArtMethod>* sp) 211 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 212 DCHECK(sp->AsMirrorPtr()->IsCalleeSaveMethod()); 213 uint8_t* lr = reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_LrOffset; 214 return *reinterpret_cast<uintptr_t*>(lr); 215 } 216 217 QuickArgumentVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, const char* shorty, 218 uint32_t shorty_len) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 219 is_static_(is_static), shorty_(shorty), shorty_len_(shorty_len), 220 gpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset), 221 fpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset), 222 stack_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize 223 + StackArgumentStartFromShorty(is_static, shorty, shorty_len)), 224 gpr_index_(0), fpr_index_(0), stack_index_(0), cur_type_(Primitive::kPrimVoid), 225 is_split_long_or_double_(false) {} 226 227 virtual ~QuickArgumentVisitor() {} 228 229 virtual void Visit() = 0; 230 231 Primitive::Type GetParamPrimitiveType() const { 232 return cur_type_; 233 } 234 235 uint8_t* GetParamAddress() const { 236 if (!kQuickSoftFloatAbi) { 237 Primitive::Type type = GetParamPrimitiveType(); 238 if (UNLIKELY((type == Primitive::kPrimDouble) || (type == Primitive::kPrimFloat))) { 239 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 240 return fpr_args_ + (fpr_index_ * GetBytesPerFprSpillLocation(kRuntimeISA)); 241 } 242 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 243 } 244 } 245 if (gpr_index_ < kNumQuickGprArgs) { 246 return gpr_args_ + GprIndexToGprOffset(gpr_index_); 247 } 248 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 249 } 250 251 bool IsSplitLongOrDouble() const { 252 if ((GetBytesPerGprSpillLocation(kRuntimeISA) == 4) || (GetBytesPerFprSpillLocation(kRuntimeISA) == 4)) { 253 return is_split_long_or_double_; 254 } else { 255 return false; // An optimization for when GPR and FPRs are 64bit. 256 } 257 } 258 259 bool IsParamAReference() const { 260 return GetParamPrimitiveType() == Primitive::kPrimNot; 261 } 262 263 bool IsParamALongOrDouble() const { 264 Primitive::Type type = GetParamPrimitiveType(); 265 return type == Primitive::kPrimLong || type == Primitive::kPrimDouble; 266 } 267 268 uint64_t ReadSplitLongParam() const { 269 DCHECK(IsSplitLongOrDouble()); 270 uint64_t low_half = *reinterpret_cast<uint32_t*>(GetParamAddress()); 271 uint64_t high_half = *reinterpret_cast<uint32_t*>(stack_args_); 272 return (low_half & 0xffffffffULL) | (high_half << 32); 273 } 274 275 void VisitArguments() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 276 // This implementation doesn't support reg-spill area for hard float 277 // ABI targets such as x86_64 and aarch64. So, for those targets whose 278 // 'kQuickSoftFloatAbi' is 'false': 279 // (a) 'stack_args_' should point to the first method's argument 280 // (b) whatever the argument type it is, the 'stack_index_' should 281 // be moved forward along with every visiting. 282 gpr_index_ = 0; 283 fpr_index_ = 0; 284 stack_index_ = 0; 285 if (!is_static_) { // Handle this. 286 cur_type_ = Primitive::kPrimNot; 287 is_split_long_or_double_ = false; 288 Visit(); 289 if (!kQuickSoftFloatAbi || kNumQuickGprArgs == 0) { 290 stack_index_++; 291 } 292 if (kNumQuickGprArgs > 0) { 293 gpr_index_++; 294 } 295 } 296 for (uint32_t shorty_index = 1; shorty_index < shorty_len_; ++shorty_index) { 297 cur_type_ = Primitive::GetType(shorty_[shorty_index]); 298 switch (cur_type_) { 299 case Primitive::kPrimNot: 300 case Primitive::kPrimBoolean: 301 case Primitive::kPrimByte: 302 case Primitive::kPrimChar: 303 case Primitive::kPrimShort: 304 case Primitive::kPrimInt: 305 is_split_long_or_double_ = false; 306 Visit(); 307 if (!kQuickSoftFloatAbi || kNumQuickGprArgs == gpr_index_) { 308 stack_index_++; 309 } 310 if (gpr_index_ < kNumQuickGprArgs) { 311 gpr_index_++; 312 } 313 break; 314 case Primitive::kPrimFloat: 315 is_split_long_or_double_ = false; 316 Visit(); 317 if (kQuickSoftFloatAbi) { 318 if (gpr_index_ < kNumQuickGprArgs) { 319 gpr_index_++; 320 } else { 321 stack_index_++; 322 } 323 } else { 324 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 325 fpr_index_++; 326 } 327 stack_index_++; 328 } 329 break; 330 case Primitive::kPrimDouble: 331 case Primitive::kPrimLong: 332 if (kQuickSoftFloatAbi || (cur_type_ == Primitive::kPrimLong)) { 333 is_split_long_or_double_ = (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) && 334 ((gpr_index_ + 1) == kNumQuickGprArgs); 335 Visit(); 336 if (!kQuickSoftFloatAbi || kNumQuickGprArgs == gpr_index_) { 337 if (kBytesStackArgLocation == 4) { 338 stack_index_+= 2; 339 } else { 340 CHECK_EQ(kBytesStackArgLocation, 8U); 341 stack_index_++; 342 } 343 } 344 if (gpr_index_ < kNumQuickGprArgs) { 345 gpr_index_++; 346 if (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) { 347 if (gpr_index_ < kNumQuickGprArgs) { 348 gpr_index_++; 349 } else if (kQuickSoftFloatAbi) { 350 stack_index_++; 351 } 352 } 353 } 354 } else { 355 is_split_long_or_double_ = (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) && 356 ((fpr_index_ + 1) == kNumQuickFprArgs); 357 Visit(); 358 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 359 fpr_index_++; 360 if (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) { 361 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 362 fpr_index_++; 363 } 364 } 365 } 366 if (kBytesStackArgLocation == 4) { 367 stack_index_+= 2; 368 } else { 369 CHECK_EQ(kBytesStackArgLocation, 8U); 370 stack_index_++; 371 } 372 } 373 break; 374 default: 375 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty_; 376 } 377 } 378 } 379 380 private: 381 static size_t StackArgumentStartFromShorty(bool is_static, const char* shorty, 382 uint32_t shorty_len) { 383 if (kQuickSoftFloatAbi) { 384 CHECK_EQ(kNumQuickFprArgs, 0U); 385 return (kNumQuickGprArgs * GetBytesPerGprSpillLocation(kRuntimeISA)) 386 + sizeof(StackReference<mirror::ArtMethod>) /* StackReference<ArtMethod> */; 387 } else { 388 // For now, there is no reg-spill area for the targets with 389 // hard float ABI. So, the offset pointing to the first method's 390 // parameter ('this' for non-static methods) should be returned. 391 return sizeof(StackReference<mirror::ArtMethod>); // Skip StackReference<ArtMethod>. 392 } 393 } 394 395 protected: 396 const bool is_static_; 397 const char* const shorty_; 398 const uint32_t shorty_len_; 399 400 private: 401 uint8_t* const gpr_args_; // Address of GPR arguments in callee save frame. 402 uint8_t* const fpr_args_; // Address of FPR arguments in callee save frame. 403 uint8_t* const stack_args_; // Address of stack arguments in caller's frame. 404 uint32_t gpr_index_; // Index into spilled GPRs. 405 uint32_t fpr_index_; // Index into spilled FPRs. 406 uint32_t stack_index_; // Index into arguments on the stack. 407 // The current type of argument during VisitArguments. 408 Primitive::Type cur_type_; 409 // Does a 64bit parameter straddle the register and stack arguments? 410 bool is_split_long_or_double_; 411}; 412 413// Visits arguments on the stack placing them into the shadow frame. 414class BuildQuickShadowFrameVisitor FINAL : public QuickArgumentVisitor { 415 public: 416 BuildQuickShadowFrameVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, 417 const char* shorty, uint32_t shorty_len, ShadowFrame* sf, 418 size_t first_arg_reg) : 419 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), sf_(sf), cur_reg_(first_arg_reg) {} 420 421 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 422 423 private: 424 ShadowFrame* const sf_; 425 uint32_t cur_reg_; 426 427 DISALLOW_COPY_AND_ASSIGN(BuildQuickShadowFrameVisitor); 428}; 429 430void BuildQuickShadowFrameVisitor::Visit() { 431 Primitive::Type type = GetParamPrimitiveType(); 432 switch (type) { 433 case Primitive::kPrimLong: // Fall-through. 434 case Primitive::kPrimDouble: 435 if (IsSplitLongOrDouble()) { 436 sf_->SetVRegLong(cur_reg_, ReadSplitLongParam()); 437 } else { 438 sf_->SetVRegLong(cur_reg_, *reinterpret_cast<jlong*>(GetParamAddress())); 439 } 440 ++cur_reg_; 441 break; 442 case Primitive::kPrimNot: { 443 StackReference<mirror::Object>* stack_ref = 444 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 445 sf_->SetVRegReference(cur_reg_, stack_ref->AsMirrorPtr()); 446 } 447 break; 448 case Primitive::kPrimBoolean: // Fall-through. 449 case Primitive::kPrimByte: // Fall-through. 450 case Primitive::kPrimChar: // Fall-through. 451 case Primitive::kPrimShort: // Fall-through. 452 case Primitive::kPrimInt: // Fall-through. 453 case Primitive::kPrimFloat: 454 sf_->SetVReg(cur_reg_, *reinterpret_cast<jint*>(GetParamAddress())); 455 break; 456 case Primitive::kPrimVoid: 457 LOG(FATAL) << "UNREACHABLE"; 458 break; 459 } 460 ++cur_reg_; 461} 462 463extern "C" uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 464 StackReference<mirror::ArtMethod>* sp) 465 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 466 // Ensure we don't get thread suspension until the object arguments are safely in the shadow 467 // frame. 468 FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsAndArgs); 469 470 if (method->IsAbstract()) { 471 ThrowAbstractMethodError(method); 472 return 0; 473 } else { 474 DCHECK(!method->IsNative()) << PrettyMethod(method); 475 const char* old_cause = self->StartAssertNoThreadSuspension( 476 "Building interpreter shadow frame"); 477 const DexFile::CodeItem* code_item = method->GetCodeItem(); 478 DCHECK(code_item != nullptr) << PrettyMethod(method); 479 uint16_t num_regs = code_item->registers_size_; 480 void* memory = alloca(ShadowFrame::ComputeSize(num_regs)); 481 // No last shadow coming from quick. 482 ShadowFrame* shadow_frame(ShadowFrame::Create(num_regs, nullptr, method, 0, memory)); 483 size_t first_arg_reg = code_item->registers_size_ - code_item->ins_size_; 484 uint32_t shorty_len = 0; 485 const char* shorty = method->GetShorty(&shorty_len); 486 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, method->IsStatic(), shorty, shorty_len, 487 shadow_frame, first_arg_reg); 488 shadow_frame_builder.VisitArguments(); 489 // Push a transition back into managed code onto the linked list in thread. 490 ManagedStack fragment; 491 self->PushManagedStackFragment(&fragment); 492 self->PushShadowFrame(shadow_frame); 493 self->EndAssertNoThreadSuspension(old_cause); 494 495 StackHandleScope<1> hs(self); 496 MethodHelper mh(hs.NewHandle(method)); 497 if (mh.Get()->IsStatic() && !mh.Get()->GetDeclaringClass()->IsInitialized()) { 498 // Ensure static method's class is initialized. 499 StackHandleScope<1> hs(self); 500 Handle<mirror::Class> h_class(hs.NewHandle(mh.Get()->GetDeclaringClass())); 501 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) { 502 DCHECK(Thread::Current()->IsExceptionPending()) << PrettyMethod(mh.Get()); 503 self->PopManagedStackFragment(fragment); 504 return 0; 505 } 506 } 507 JValue result = interpreter::EnterInterpreterFromStub(self, mh, code_item, *shadow_frame); 508 // Pop transition. 509 self->PopManagedStackFragment(fragment); 510 // No need to restore the args since the method has already been run by the interpreter. 511 return result.GetJ(); 512 } 513} 514 515// Visits arguments on the stack placing them into the args vector, Object* arguments are converted 516// to jobjects. 517class BuildQuickArgumentVisitor FINAL : public QuickArgumentVisitor { 518 public: 519 BuildQuickArgumentVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, 520 const char* shorty, uint32_t shorty_len, 521 ScopedObjectAccessUnchecked* soa, std::vector<jvalue>* args) : 522 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa), args_(args) {} 523 524 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 525 526 void FixupReferences() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 527 528 private: 529 ScopedObjectAccessUnchecked* const soa_; 530 std::vector<jvalue>* const args_; 531 // References which we must update when exiting in case the GC moved the objects. 532 std::vector<std::pair<jobject, StackReference<mirror::Object>*>> references_; 533 534 DISALLOW_COPY_AND_ASSIGN(BuildQuickArgumentVisitor); 535}; 536 537void BuildQuickArgumentVisitor::Visit() { 538 jvalue val; 539 Primitive::Type type = GetParamPrimitiveType(); 540 switch (type) { 541 case Primitive::kPrimNot: { 542 StackReference<mirror::Object>* stack_ref = 543 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 544 val.l = soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 545 references_.push_back(std::make_pair(val.l, stack_ref)); 546 break; 547 } 548 case Primitive::kPrimLong: // Fall-through. 549 case Primitive::kPrimDouble: 550 if (IsSplitLongOrDouble()) { 551 val.j = ReadSplitLongParam(); 552 } else { 553 val.j = *reinterpret_cast<jlong*>(GetParamAddress()); 554 } 555 break; 556 case Primitive::kPrimBoolean: // Fall-through. 557 case Primitive::kPrimByte: // Fall-through. 558 case Primitive::kPrimChar: // Fall-through. 559 case Primitive::kPrimShort: // Fall-through. 560 case Primitive::kPrimInt: // Fall-through. 561 case Primitive::kPrimFloat: 562 val.i = *reinterpret_cast<jint*>(GetParamAddress()); 563 break; 564 case Primitive::kPrimVoid: 565 LOG(FATAL) << "UNREACHABLE"; 566 val.j = 0; 567 break; 568 } 569 args_->push_back(val); 570} 571 572void BuildQuickArgumentVisitor::FixupReferences() { 573 // Fixup any references which may have changed. 574 for (const auto& pair : references_) { 575 pair.second->Assign(soa_->Decode<mirror::Object*>(pair.first)); 576 soa_->Env()->DeleteLocalRef(pair.first); 577 } 578} 579 580// Handler for invocation on proxy methods. On entry a frame will exist for the proxy object method 581// which is responsible for recording callee save registers. We explicitly place into jobjects the 582// incoming reference arguments (so they survive GC). We invoke the invocation handler, which is a 583// field within the proxy object, which will box the primitive arguments and deal with error cases. 584extern "C" uint64_t artQuickProxyInvokeHandler(mirror::ArtMethod* proxy_method, 585 mirror::Object* receiver, 586 Thread* self, StackReference<mirror::ArtMethod>* sp) 587 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 588 DCHECK(proxy_method->IsProxyMethod()) << PrettyMethod(proxy_method); 589 DCHECK(receiver->GetClass()->IsProxyClass()) << PrettyMethod(proxy_method); 590 // Ensure we don't get thread suspension until the object arguments are safely in jobjects. 591 const char* old_cause = 592 self->StartAssertNoThreadSuspension("Adding to IRT proxy object arguments"); 593 // Register the top of the managed stack, making stack crawlable. 594 DCHECK_EQ(sp->AsMirrorPtr(), proxy_method) << PrettyMethod(proxy_method); 595 self->SetTopOfStack(sp, 0); 596 DCHECK_EQ(proxy_method->GetFrameSizeInBytes(), 597 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs)->GetFrameSizeInBytes()) 598 << PrettyMethod(proxy_method); 599 self->VerifyStack(); 600 // Start new JNI local reference state. 601 JNIEnvExt* env = self->GetJniEnv(); 602 ScopedObjectAccessUnchecked soa(env); 603 ScopedJniEnvLocalRefState env_state(env); 604 // Create local ref. copies of proxy method and the receiver. 605 jobject rcvr_jobj = soa.AddLocalReference<jobject>(receiver); 606 607 // Placing arguments into args vector and remove the receiver. 608 mirror::ArtMethod* non_proxy_method = proxy_method->GetInterfaceMethodIfProxy(); 609 CHECK(!non_proxy_method->IsStatic()) << PrettyMethod(proxy_method) << " " 610 << PrettyMethod(non_proxy_method); 611 std::vector<jvalue> args; 612 uint32_t shorty_len = 0; 613 const char* shorty = proxy_method->GetShorty(&shorty_len); 614 BuildQuickArgumentVisitor local_ref_visitor(sp, false, shorty, shorty_len, &soa, &args); 615 616 local_ref_visitor.VisitArguments(); 617 DCHECK_GT(args.size(), 0U) << PrettyMethod(proxy_method); 618 args.erase(args.begin()); 619 620 // Convert proxy method into expected interface method. 621 mirror::ArtMethod* interface_method = proxy_method->FindOverriddenMethod(); 622 DCHECK(interface_method != NULL) << PrettyMethod(proxy_method); 623 DCHECK(!interface_method->IsProxyMethod()) << PrettyMethod(interface_method); 624 jobject interface_method_jobj = soa.AddLocalReference<jobject>(interface_method); 625 626 // All naked Object*s should now be in jobjects, so its safe to go into the main invoke code 627 // that performs allocations. 628 self->EndAssertNoThreadSuspension(old_cause); 629 JValue result = InvokeProxyInvocationHandler(soa, shorty, rcvr_jobj, interface_method_jobj, args); 630 // Restore references which might have moved. 631 local_ref_visitor.FixupReferences(); 632 return result.GetJ(); 633} 634 635// Read object references held in arguments from quick frames and place in a JNI local references, 636// so they don't get garbage collected. 637class RememberForGcArgumentVisitor FINAL : public QuickArgumentVisitor { 638 public: 639 RememberForGcArgumentVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, 640 const char* shorty, uint32_t shorty_len, 641 ScopedObjectAccessUnchecked* soa) : 642 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa) {} 643 644 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 645 646 void FixupReferences() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 647 648 private: 649 ScopedObjectAccessUnchecked* const soa_; 650 // References which we must update when exiting in case the GC moved the objects. 651 std::vector<std::pair<jobject, StackReference<mirror::Object>*> > references_; 652 653 DISALLOW_COPY_AND_ASSIGN(RememberForGcArgumentVisitor); 654}; 655 656void RememberForGcArgumentVisitor::Visit() { 657 if (IsParamAReference()) { 658 StackReference<mirror::Object>* stack_ref = 659 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 660 jobject reference = 661 soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 662 references_.push_back(std::make_pair(reference, stack_ref)); 663 } 664} 665 666void RememberForGcArgumentVisitor::FixupReferences() { 667 // Fixup any references which may have changed. 668 for (const auto& pair : references_) { 669 pair.second->Assign(soa_->Decode<mirror::Object*>(pair.first)); 670 soa_->Env()->DeleteLocalRef(pair.first); 671 } 672} 673 674// Lazily resolve a method for quick. Called by stub code. 675extern "C" const void* artQuickResolutionTrampoline(mirror::ArtMethod* called, 676 mirror::Object* receiver, 677 Thread* self, 678 StackReference<mirror::ArtMethod>* sp) 679 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 680 FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsAndArgs); 681 // Start new JNI local reference state 682 JNIEnvExt* env = self->GetJniEnv(); 683 ScopedObjectAccessUnchecked soa(env); 684 ScopedJniEnvLocalRefState env_state(env); 685 const char* old_cause = self->StartAssertNoThreadSuspension("Quick method resolution set up"); 686 687 // Compute details about the called method (avoid GCs) 688 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 689 mirror::ArtMethod* caller = QuickArgumentVisitor::GetCallingMethod(sp); 690 InvokeType invoke_type; 691 const DexFile* dex_file; 692 uint32_t dex_method_idx; 693 if (called->IsRuntimeMethod()) { 694 uint32_t dex_pc = caller->ToDexPc(QuickArgumentVisitor::GetCallingPc(sp)); 695 const DexFile::CodeItem* code; 696 dex_file = caller->GetDexFile(); 697 code = caller->GetCodeItem(); 698 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 699 const Instruction* instr = Instruction::At(&code->insns_[dex_pc]); 700 Instruction::Code instr_code = instr->Opcode(); 701 bool is_range; 702 switch (instr_code) { 703 case Instruction::INVOKE_DIRECT: 704 invoke_type = kDirect; 705 is_range = false; 706 break; 707 case Instruction::INVOKE_DIRECT_RANGE: 708 invoke_type = kDirect; 709 is_range = true; 710 break; 711 case Instruction::INVOKE_STATIC: 712 invoke_type = kStatic; 713 is_range = false; 714 break; 715 case Instruction::INVOKE_STATIC_RANGE: 716 invoke_type = kStatic; 717 is_range = true; 718 break; 719 case Instruction::INVOKE_SUPER: 720 invoke_type = kSuper; 721 is_range = false; 722 break; 723 case Instruction::INVOKE_SUPER_RANGE: 724 invoke_type = kSuper; 725 is_range = true; 726 break; 727 case Instruction::INVOKE_VIRTUAL: 728 invoke_type = kVirtual; 729 is_range = false; 730 break; 731 case Instruction::INVOKE_VIRTUAL_RANGE: 732 invoke_type = kVirtual; 733 is_range = true; 734 break; 735 case Instruction::INVOKE_INTERFACE: 736 invoke_type = kInterface; 737 is_range = false; 738 break; 739 case Instruction::INVOKE_INTERFACE_RANGE: 740 invoke_type = kInterface; 741 is_range = true; 742 break; 743 default: 744 LOG(FATAL) << "Unexpected call into trampoline: " << instr->DumpString(NULL); 745 // Avoid used uninitialized warnings. 746 invoke_type = kDirect; 747 is_range = false; 748 } 749 dex_method_idx = (is_range) ? instr->VRegB_3rc() : instr->VRegB_35c(); 750 } else { 751 invoke_type = kStatic; 752 dex_file = called->GetDexFile(); 753 dex_method_idx = called->GetDexMethodIndex(); 754 } 755 uint32_t shorty_len; 756 const char* shorty = 757 dex_file->GetMethodShorty(dex_file->GetMethodId(dex_method_idx), &shorty_len); 758 RememberForGcArgumentVisitor visitor(sp, invoke_type == kStatic, shorty, shorty_len, &soa); 759 visitor.VisitArguments(); 760 self->EndAssertNoThreadSuspension(old_cause); 761 bool virtual_or_interface = invoke_type == kVirtual || invoke_type == kInterface; 762 // Resolve method filling in dex cache. 763 if (UNLIKELY(called->IsRuntimeMethod())) { 764 StackHandleScope<1> hs(self); 765 mirror::Object* dummy = nullptr; 766 HandleWrapper<mirror::Object> h_receiver( 767 hs.NewHandleWrapper(virtual_or_interface ? &receiver : &dummy)); 768 called = linker->ResolveMethod(self, dex_method_idx, &caller, invoke_type); 769 } 770 const void* code = NULL; 771 if (LIKELY(!self->IsExceptionPending())) { 772 // Incompatible class change should have been handled in resolve method. 773 CHECK(!called->CheckIncompatibleClassChange(invoke_type)) 774 << PrettyMethod(called) << " " << invoke_type; 775 if (virtual_or_interface) { 776 // Refine called method based on receiver. 777 CHECK(receiver != nullptr) << invoke_type; 778 779 mirror::ArtMethod* orig_called = called; 780 if (invoke_type == kVirtual) { 781 called = receiver->GetClass()->FindVirtualMethodForVirtual(called); 782 } else { 783 called = receiver->GetClass()->FindVirtualMethodForInterface(called); 784 } 785 786 CHECK(called != nullptr) << PrettyMethod(orig_called) << " " 787 << PrettyTypeOf(receiver) << " " 788 << invoke_type << " " << orig_called->GetVtableIndex(); 789 790 // We came here because of sharpening. Ensure the dex cache is up-to-date on the method index 791 // of the sharpened method. 792 if (called->HasSameDexCacheResolvedMethods(caller)) { 793 caller->SetDexCacheResolvedMethod(called->GetDexMethodIndex(), called); 794 } else { 795 // Calling from one dex file to another, need to compute the method index appropriate to 796 // the caller's dex file. Since we get here only if the original called was a runtime 797 // method, we've got the correct dex_file and a dex_method_idx from above. 798 DCHECK_EQ(caller->GetDexFile(), dex_file); 799 StackHandleScope<1> hs(self); 800 MethodHelper mh(hs.NewHandle(called)); 801 uint32_t method_index = mh.FindDexMethodIndexInOtherDexFile(*dex_file, dex_method_idx); 802 if (method_index != DexFile::kDexNoIndex) { 803 caller->SetDexCacheResolvedMethod(method_index, called); 804 } 805 } 806 } 807 // Ensure that the called method's class is initialized. 808 StackHandleScope<1> hs(soa.Self()); 809 Handle<mirror::Class> called_class(hs.NewHandle(called->GetDeclaringClass())); 810 linker->EnsureInitialized(soa.Self(), called_class, true, true); 811 if (LIKELY(called_class->IsInitialized())) { 812 code = called->GetEntryPointFromQuickCompiledCode(); 813 } else if (called_class->IsInitializing()) { 814 if (invoke_type == kStatic) { 815 // Class is still initializing, go to oat and grab code (trampoline must be left in place 816 // until class is initialized to stop races between threads). 817 code = linker->GetQuickOatCodeFor(called); 818 } else { 819 // No trampoline for non-static methods. 820 code = called->GetEntryPointFromQuickCompiledCode(); 821 } 822 } else { 823 DCHECK(called_class->IsErroneous()); 824 } 825 } 826 CHECK_EQ(code == NULL, self->IsExceptionPending()); 827 // Fixup any locally saved objects may have moved during a GC. 828 visitor.FixupReferences(); 829 // Place called method in callee-save frame to be placed as first argument to quick method. 830 sp->Assign(called); 831 return code; 832} 833 834/* 835 * This class uses a couple of observations to unite the different calling conventions through 836 * a few constants. 837 * 838 * 1) Number of registers used for passing is normally even, so counting down has no penalty for 839 * possible alignment. 840 * 2) Known 64b architectures store 8B units on the stack, both for integral and floating point 841 * types, so using uintptr_t is OK. Also means that we can use kRegistersNeededX to denote 842 * when we have to split things 843 * 3) The only soft-float, Arm, is 32b, so no widening needs to be taken into account for floats 844 * and we can use Int handling directly. 845 * 4) Only 64b architectures widen, and their stack is aligned 8B anyways, so no padding code 846 * necessary when widening. Also, widening of Ints will take place implicitly, and the 847 * extension should be compatible with Aarch64, which mandates copying the available bits 848 * into LSB and leaving the rest unspecified. 849 * 5) Aligning longs and doubles is necessary on arm only, and it's the same in registers and on 850 * the stack. 851 * 6) There is only little endian. 852 * 853 * 854 * Actual work is supposed to be done in a delegate of the template type. The interface is as 855 * follows: 856 * 857 * void PushGpr(uintptr_t): Add a value for the next GPR 858 * 859 * void PushFpr4(float): Add a value for the next FPR of size 32b. Is only called if we need 860 * padding, that is, think the architecture is 32b and aligns 64b. 861 * 862 * void PushFpr8(uint64_t): Push a double. We _will_ call this on 32b, it's the callee's job to 863 * split this if necessary. The current state will have aligned, if 864 * necessary. 865 * 866 * void PushStack(uintptr_t): Push a value to the stack. 867 * 868 * uintptr_t PushHandleScope(mirror::Object* ref): Add a reference to the HandleScope. This _will_ have nullptr, 869 * as this might be important for null initialization. 870 * Must return the jobject, that is, the reference to the 871 * entry in the HandleScope (nullptr if necessary). 872 * 873 */ 874template<class T> class BuildNativeCallFrameStateMachine { 875 public: 876#if defined(__arm__) 877 // TODO: These are all dummy values! 878 static constexpr bool kNativeSoftFloatAbi = true; 879 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs, r0-r3 880 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 881 882 static constexpr size_t kRegistersNeededForLong = 2; 883 static constexpr size_t kRegistersNeededForDouble = 2; 884 static constexpr bool kMultiRegistersAligned = true; 885 static constexpr bool kMultiRegistersWidened = false; 886 static constexpr bool kAlignLongOnStack = true; 887 static constexpr bool kAlignDoubleOnStack = true; 888#elif defined(__aarch64__) 889 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 890 static constexpr size_t kNumNativeGprArgs = 8; // 6 arguments passed in GPRs. 891 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 892 893 static constexpr size_t kRegistersNeededForLong = 1; 894 static constexpr size_t kRegistersNeededForDouble = 1; 895 static constexpr bool kMultiRegistersAligned = false; 896 static constexpr bool kMultiRegistersWidened = false; 897 static constexpr bool kAlignLongOnStack = false; 898 static constexpr bool kAlignDoubleOnStack = false; 899#elif defined(__mips__) 900 // TODO: These are all dummy values! 901 static constexpr bool kNativeSoftFloatAbi = true; // This is a hard float ABI. 902 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 903 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 904 905 static constexpr size_t kRegistersNeededForLong = 2; 906 static constexpr size_t kRegistersNeededForDouble = 2; 907 static constexpr bool kMultiRegistersAligned = true; 908 static constexpr bool kMultiRegistersWidened = true; 909 static constexpr bool kAlignLongOnStack = false; 910 static constexpr bool kAlignDoubleOnStack = false; 911#elif defined(__i386__) 912 // TODO: Check these! 913 static constexpr bool kNativeSoftFloatAbi = false; // Not using int registers for fp 914 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 915 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 916 917 static constexpr size_t kRegistersNeededForLong = 2; 918 static constexpr size_t kRegistersNeededForDouble = 2; 919 static constexpr bool kMultiRegistersAligned = false; // x86 not using regs, anyways 920 static constexpr bool kMultiRegistersWidened = false; 921 static constexpr bool kAlignLongOnStack = false; 922 static constexpr bool kAlignDoubleOnStack = false; 923#elif defined(__x86_64__) 924 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 925 static constexpr size_t kNumNativeGprArgs = 6; // 6 arguments passed in GPRs. 926 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 927 928 static constexpr size_t kRegistersNeededForLong = 1; 929 static constexpr size_t kRegistersNeededForDouble = 1; 930 static constexpr bool kMultiRegistersAligned = false; 931 static constexpr bool kMultiRegistersWidened = false; 932 static constexpr bool kAlignLongOnStack = false; 933 static constexpr bool kAlignDoubleOnStack = false; 934#else 935#error "Unsupported architecture" 936#endif 937 938 public: 939 explicit BuildNativeCallFrameStateMachine(T* delegate) 940 : gpr_index_(kNumNativeGprArgs), 941 fpr_index_(kNumNativeFprArgs), 942 stack_entries_(0), 943 delegate_(delegate) { 944 // For register alignment, we want to assume that counters (gpr_index_, fpr_index_) are even iff 945 // the next register is even; counting down is just to make the compiler happy... 946 CHECK_EQ(kNumNativeGprArgs % 2, 0U); 947 CHECK_EQ(kNumNativeFprArgs % 2, 0U); 948 } 949 950 virtual ~BuildNativeCallFrameStateMachine() {} 951 952 bool HavePointerGpr() { 953 return gpr_index_ > 0; 954 } 955 956 void AdvancePointer(const void* val) { 957 if (HavePointerGpr()) { 958 gpr_index_--; 959 PushGpr(reinterpret_cast<uintptr_t>(val)); 960 } else { 961 stack_entries_++; // TODO: have a field for pointer length as multiple of 32b 962 PushStack(reinterpret_cast<uintptr_t>(val)); 963 gpr_index_ = 0; 964 } 965 } 966 967 bool HaveHandleScopeGpr() { 968 return gpr_index_ > 0; 969 } 970 971 void AdvanceHandleScope(mirror::Object* ptr) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 972 uintptr_t handle = PushHandle(ptr); 973 if (HaveHandleScopeGpr()) { 974 gpr_index_--; 975 PushGpr(handle); 976 } else { 977 stack_entries_++; 978 PushStack(handle); 979 gpr_index_ = 0; 980 } 981 } 982 983 bool HaveIntGpr() { 984 return gpr_index_ > 0; 985 } 986 987 void AdvanceInt(uint32_t val) { 988 if (HaveIntGpr()) { 989 gpr_index_--; 990 PushGpr(val); 991 } else { 992 stack_entries_++; 993 PushStack(val); 994 gpr_index_ = 0; 995 } 996 } 997 998 bool HaveLongGpr() { 999 return gpr_index_ >= kRegistersNeededForLong + (LongGprNeedsPadding() ? 1 : 0); 1000 } 1001 1002 bool LongGprNeedsPadding() { 1003 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1004 kAlignLongOnStack && // and when it needs alignment 1005 (gpr_index_ & 1) == 1; // counter is odd, see constructor 1006 } 1007 1008 bool LongStackNeedsPadding() { 1009 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1010 kAlignLongOnStack && // and when it needs 8B alignment 1011 (stack_entries_ & 1) == 1; // counter is odd 1012 } 1013 1014 void AdvanceLong(uint64_t val) { 1015 if (HaveLongGpr()) { 1016 if (LongGprNeedsPadding()) { 1017 PushGpr(0); 1018 gpr_index_--; 1019 } 1020 if (kRegistersNeededForLong == 1) { 1021 PushGpr(static_cast<uintptr_t>(val)); 1022 } else { 1023 PushGpr(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1024 PushGpr(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1025 } 1026 gpr_index_ -= kRegistersNeededForLong; 1027 } else { 1028 if (LongStackNeedsPadding()) { 1029 PushStack(0); 1030 stack_entries_++; 1031 } 1032 if (kRegistersNeededForLong == 1) { 1033 PushStack(static_cast<uintptr_t>(val)); 1034 stack_entries_++; 1035 } else { 1036 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1037 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1038 stack_entries_ += 2; 1039 } 1040 gpr_index_ = 0; 1041 } 1042 } 1043 1044 bool HaveFloatFpr() { 1045 return fpr_index_ > 0; 1046 } 1047 1048 void AdvanceFloat(float val) { 1049 if (kNativeSoftFloatAbi) { 1050 AdvanceInt(bit_cast<float, uint32_t>(val)); 1051 } else { 1052 if (HaveFloatFpr()) { 1053 fpr_index_--; 1054 if (kRegistersNeededForDouble == 1) { 1055 if (kMultiRegistersWidened) { 1056 PushFpr8(bit_cast<double, uint64_t>(val)); 1057 } else { 1058 // No widening, just use the bits. 1059 PushFpr8(bit_cast<float, uint64_t>(val)); 1060 } 1061 } else { 1062 PushFpr4(val); 1063 } 1064 } else { 1065 stack_entries_++; 1066 if (kRegistersNeededForDouble == 1 && kMultiRegistersWidened) { 1067 // Need to widen before storing: Note the "double" in the template instantiation. 1068 // Note: We need to jump through those hoops to make the compiler happy. 1069 DCHECK_EQ(sizeof(uintptr_t), sizeof(uint64_t)); 1070 PushStack(static_cast<uintptr_t>(bit_cast<double, uint64_t>(val))); 1071 } else { 1072 PushStack(bit_cast<float, uintptr_t>(val)); 1073 } 1074 fpr_index_ = 0; 1075 } 1076 } 1077 } 1078 1079 bool HaveDoubleFpr() { 1080 return fpr_index_ >= kRegistersNeededForDouble + (DoubleFprNeedsPadding() ? 1 : 0); 1081 } 1082 1083 bool DoubleFprNeedsPadding() { 1084 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1085 kAlignDoubleOnStack && // and when it needs alignment 1086 (fpr_index_ & 1) == 1; // counter is odd, see constructor 1087 } 1088 1089 bool DoubleStackNeedsPadding() { 1090 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1091 kAlignDoubleOnStack && // and when it needs 8B alignment 1092 (stack_entries_ & 1) == 1; // counter is odd 1093 } 1094 1095 void AdvanceDouble(uint64_t val) { 1096 if (kNativeSoftFloatAbi) { 1097 AdvanceLong(val); 1098 } else { 1099 if (HaveDoubleFpr()) { 1100 if (DoubleFprNeedsPadding()) { 1101 PushFpr4(0); 1102 fpr_index_--; 1103 } 1104 PushFpr8(val); 1105 fpr_index_ -= kRegistersNeededForDouble; 1106 } else { 1107 if (DoubleStackNeedsPadding()) { 1108 PushStack(0); 1109 stack_entries_++; 1110 } 1111 if (kRegistersNeededForDouble == 1) { 1112 PushStack(static_cast<uintptr_t>(val)); 1113 stack_entries_++; 1114 } else { 1115 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1116 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1117 stack_entries_ += 2; 1118 } 1119 fpr_index_ = 0; 1120 } 1121 } 1122 } 1123 1124 uint32_t getStackEntries() { 1125 return stack_entries_; 1126 } 1127 1128 uint32_t getNumberOfUsedGprs() { 1129 return kNumNativeGprArgs - gpr_index_; 1130 } 1131 1132 uint32_t getNumberOfUsedFprs() { 1133 return kNumNativeFprArgs - fpr_index_; 1134 } 1135 1136 private: 1137 void PushGpr(uintptr_t val) { 1138 delegate_->PushGpr(val); 1139 } 1140 void PushFpr4(float val) { 1141 delegate_->PushFpr4(val); 1142 } 1143 void PushFpr8(uint64_t val) { 1144 delegate_->PushFpr8(val); 1145 } 1146 void PushStack(uintptr_t val) { 1147 delegate_->PushStack(val); 1148 } 1149 uintptr_t PushHandle(mirror::Object* ref) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1150 return delegate_->PushHandle(ref); 1151 } 1152 1153 uint32_t gpr_index_; // Number of free GPRs 1154 uint32_t fpr_index_; // Number of free FPRs 1155 uint32_t stack_entries_; // Stack entries are in multiples of 32b, as floats are usually not 1156 // extended 1157 T* delegate_; // What Push implementation gets called 1158}; 1159 1160// Computes the sizes of register stacks and call stack area. Handling of references can be extended 1161// in subclasses. 1162// 1163// To handle native pointers, use "L" in the shorty for an object reference, which simulates 1164// them with handles. 1165class ComputeNativeCallFrameSize { 1166 public: 1167 ComputeNativeCallFrameSize() : num_stack_entries_(0) {} 1168 1169 virtual ~ComputeNativeCallFrameSize() {} 1170 1171 uint32_t GetStackSize() { 1172 return num_stack_entries_ * sizeof(uintptr_t); 1173 } 1174 1175 uint8_t* LayoutCallStack(uint8_t* sp8) { 1176 sp8 -= GetStackSize(); 1177 // Align by kStackAlignment. 1178 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1179 return sp8; 1180 } 1181 1182 uint8_t* LayoutCallRegisterStacks(uint8_t* sp8, uintptr_t** start_gpr, uint32_t** start_fpr) { 1183 // Assumption is OK right now, as we have soft-float arm 1184 size_t fregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeFprArgs; 1185 sp8 -= fregs * sizeof(uintptr_t); 1186 *start_fpr = reinterpret_cast<uint32_t*>(sp8); 1187 size_t iregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeGprArgs; 1188 sp8 -= iregs * sizeof(uintptr_t); 1189 *start_gpr = reinterpret_cast<uintptr_t*>(sp8); 1190 return sp8; 1191 } 1192 1193 uint8_t* LayoutNativeCall(uint8_t* sp8, uintptr_t** start_stack, uintptr_t** start_gpr, 1194 uint32_t** start_fpr) { 1195 // Native call stack. 1196 sp8 = LayoutCallStack(sp8); 1197 *start_stack = reinterpret_cast<uintptr_t*>(sp8); 1198 1199 // Put fprs and gprs below. 1200 sp8 = LayoutCallRegisterStacks(sp8, start_gpr, start_fpr); 1201 1202 // Return the new bottom. 1203 return sp8; 1204 } 1205 1206 virtual void WalkHeader(BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) 1207 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {} 1208 1209 void Walk(const char* shorty, uint32_t shorty_len) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1210 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize> sm(this); 1211 1212 WalkHeader(&sm); 1213 1214 for (uint32_t i = 1; i < shorty_len; ++i) { 1215 Primitive::Type cur_type_ = Primitive::GetType(shorty[i]); 1216 switch (cur_type_) { 1217 case Primitive::kPrimNot: 1218 sm.AdvanceHandleScope( 1219 reinterpret_cast<mirror::Object*>(0x12345678)); 1220 break; 1221 1222 case Primitive::kPrimBoolean: 1223 case Primitive::kPrimByte: 1224 case Primitive::kPrimChar: 1225 case Primitive::kPrimShort: 1226 case Primitive::kPrimInt: 1227 sm.AdvanceInt(0); 1228 break; 1229 case Primitive::kPrimFloat: 1230 sm.AdvanceFloat(0); 1231 break; 1232 case Primitive::kPrimDouble: 1233 sm.AdvanceDouble(0); 1234 break; 1235 case Primitive::kPrimLong: 1236 sm.AdvanceLong(0); 1237 break; 1238 default: 1239 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty; 1240 } 1241 } 1242 1243 num_stack_entries_ = sm.getStackEntries(); 1244 } 1245 1246 void PushGpr(uintptr_t /* val */) { 1247 // not optimizing registers, yet 1248 } 1249 1250 void PushFpr4(float /* val */) { 1251 // not optimizing registers, yet 1252 } 1253 1254 void PushFpr8(uint64_t /* val */) { 1255 // not optimizing registers, yet 1256 } 1257 1258 void PushStack(uintptr_t /* val */) { 1259 // counting is already done in the superclass 1260 } 1261 1262 virtual uintptr_t PushHandle(mirror::Object* /* ptr */) { 1263 return reinterpret_cast<uintptr_t>(nullptr); 1264 } 1265 1266 protected: 1267 uint32_t num_stack_entries_; 1268}; 1269 1270class ComputeGenericJniFrameSize FINAL : public ComputeNativeCallFrameSize { 1271 public: 1272 ComputeGenericJniFrameSize() : num_handle_scope_references_(0) {} 1273 1274 // Lays out the callee-save frame. Assumes that the incorrect frame corresponding to RefsAndArgs 1275 // is at *m = sp. Will update to point to the bottom of the save frame. 1276 // 1277 // Note: assumes ComputeAll() has been run before. 1278 void LayoutCalleeSaveFrame(Thread* self, StackReference<mirror::ArtMethod>** m, void* sp, 1279 HandleScope** handle_scope) 1280 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1281 mirror::ArtMethod* method = (*m)->AsMirrorPtr(); 1282 1283 uint8_t* sp8 = reinterpret_cast<uint8_t*>(sp); 1284 1285 // First, fix up the layout of the callee-save frame. 1286 // We have to squeeze in the HandleScope, and relocate the method pointer. 1287 1288 // "Free" the slot for the method. 1289 sp8 += sizeof(void*); // In the callee-save frame we use a full pointer. 1290 1291 // Under the callee saves put handle scope and new method stack reference. 1292 size_t handle_scope_size = HandleScope::SizeOf(num_handle_scope_references_); 1293 size_t scope_and_method = handle_scope_size + sizeof(StackReference<mirror::ArtMethod>); 1294 1295 sp8 -= scope_and_method; 1296 // Align by kStackAlignment. 1297 sp8 = reinterpret_cast<uint8_t*>(RoundDown( 1298 reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1299 1300 uint8_t* sp8_table = sp8 + sizeof(StackReference<mirror::ArtMethod>); 1301 *handle_scope = HandleScope::Create(sp8_table, self->GetTopHandleScope(), 1302 num_handle_scope_references_); 1303 1304 // Add a slot for the method pointer, and fill it. Fix the pointer-pointer given to us. 1305 uint8_t* method_pointer = sp8; 1306 StackReference<mirror::ArtMethod>* new_method_ref = 1307 reinterpret_cast<StackReference<mirror::ArtMethod>*>(method_pointer); 1308 new_method_ref->Assign(method); 1309 *m = new_method_ref; 1310 } 1311 1312 // Adds space for the cookie. Note: may leave stack unaligned. 1313 void LayoutCookie(uint8_t** sp) { 1314 // Reference cookie and padding 1315 *sp -= 8; 1316 } 1317 1318 // Re-layout the callee-save frame (insert a handle-scope). Then add space for the cookie. 1319 // Returns the new bottom. Note: this may be unaligned. 1320 uint8_t* LayoutJNISaveFrame(Thread* self, StackReference<mirror::ArtMethod>** m, void* sp, 1321 HandleScope** handle_scope) 1322 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1323 // First, fix up the layout of the callee-save frame. 1324 // We have to squeeze in the HandleScope, and relocate the method pointer. 1325 LayoutCalleeSaveFrame(self, m, sp, handle_scope); 1326 1327 // The bottom of the callee-save frame is now where the method is, *m. 1328 uint8_t* sp8 = reinterpret_cast<uint8_t*>(*m); 1329 1330 // Add space for cookie. 1331 LayoutCookie(&sp8); 1332 1333 return sp8; 1334 } 1335 1336 // WARNING: After this, *sp won't be pointing to the method anymore! 1337 uint8_t* ComputeLayout(Thread* self, StackReference<mirror::ArtMethod>** m, 1338 bool is_static, const char* shorty, uint32_t shorty_len, 1339 HandleScope** handle_scope, 1340 uintptr_t** start_stack, uintptr_t** start_gpr, uint32_t** start_fpr) 1341 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1342 Walk(shorty, shorty_len); 1343 1344 // JNI part. 1345 uint8_t* sp8 = LayoutJNISaveFrame(self, m, reinterpret_cast<void*>(*m), handle_scope); 1346 1347 sp8 = LayoutNativeCall(sp8, start_stack, start_gpr, start_fpr); 1348 1349 // Return the new bottom. 1350 return sp8; 1351 } 1352 1353 uintptr_t PushHandle(mirror::Object* /* ptr */) OVERRIDE; 1354 1355 // Add JNIEnv* and jobj/jclass before the shorty-derived elements. 1356 void WalkHeader(BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) OVERRIDE 1357 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1358 1359 private: 1360 uint32_t num_handle_scope_references_; 1361}; 1362 1363uintptr_t ComputeGenericJniFrameSize::PushHandle(mirror::Object* /* ptr */) { 1364 num_handle_scope_references_++; 1365 return reinterpret_cast<uintptr_t>(nullptr); 1366} 1367 1368void ComputeGenericJniFrameSize::WalkHeader( 1369 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) { 1370 // JNIEnv 1371 sm->AdvancePointer(nullptr); 1372 1373 // Class object or this as first argument 1374 sm->AdvanceHandleScope(reinterpret_cast<mirror::Object*>(0x12345678)); 1375} 1376 1377// Class to push values to three separate regions. Used to fill the native call part. Adheres to 1378// the template requirements of BuildGenericJniFrameStateMachine. 1379class FillNativeCall { 1380 public: 1381 FillNativeCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) : 1382 cur_gpr_reg_(gpr_regs), cur_fpr_reg_(fpr_regs), cur_stack_arg_(stack_args) {} 1383 1384 virtual ~FillNativeCall() {} 1385 1386 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) { 1387 cur_gpr_reg_ = gpr_regs; 1388 cur_fpr_reg_ = fpr_regs; 1389 cur_stack_arg_ = stack_args; 1390 } 1391 1392 void PushGpr(uintptr_t val) { 1393 *cur_gpr_reg_ = val; 1394 cur_gpr_reg_++; 1395 } 1396 1397 void PushFpr4(float val) { 1398 *cur_fpr_reg_ = val; 1399 cur_fpr_reg_++; 1400 } 1401 1402 void PushFpr8(uint64_t val) { 1403 uint64_t* tmp = reinterpret_cast<uint64_t*>(cur_fpr_reg_); 1404 *tmp = val; 1405 cur_fpr_reg_ += 2; 1406 } 1407 1408 void PushStack(uintptr_t val) { 1409 *cur_stack_arg_ = val; 1410 cur_stack_arg_++; 1411 } 1412 1413 virtual uintptr_t PushHandle(mirror::Object* ref) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1414 LOG(FATAL) << "(Non-JNI) Native call does not use handles."; 1415 return 0U; 1416 } 1417 1418 private: 1419 uintptr_t* cur_gpr_reg_; 1420 uint32_t* cur_fpr_reg_; 1421 uintptr_t* cur_stack_arg_; 1422}; 1423 1424// Visits arguments on the stack placing them into a region lower down the stack for the benefit 1425// of transitioning into native code. 1426class BuildGenericJniFrameVisitor FINAL : public QuickArgumentVisitor { 1427 public: 1428 BuildGenericJniFrameVisitor(Thread* self, bool is_static, const char* shorty, uint32_t shorty_len, 1429 StackReference<mirror::ArtMethod>** sp) 1430 : QuickArgumentVisitor(*sp, is_static, shorty, shorty_len), 1431 jni_call_(nullptr, nullptr, nullptr, nullptr), sm_(&jni_call_) { 1432 ComputeGenericJniFrameSize fsc; 1433 uintptr_t* start_gpr_reg; 1434 uint32_t* start_fpr_reg; 1435 uintptr_t* start_stack_arg; 1436 bottom_of_used_area_ = fsc.ComputeLayout(self, sp, is_static, shorty, shorty_len, 1437 &handle_scope_, 1438 &start_stack_arg, 1439 &start_gpr_reg, &start_fpr_reg); 1440 1441 jni_call_.Reset(start_gpr_reg, start_fpr_reg, start_stack_arg, handle_scope_); 1442 1443 // jni environment is always first argument 1444 sm_.AdvancePointer(self->GetJniEnv()); 1445 1446 if (is_static) { 1447 sm_.AdvanceHandleScope((*sp)->AsMirrorPtr()->GetDeclaringClass()); 1448 } 1449 } 1450 1451 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 1452 1453 void FinalizeHandleScope(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1454 1455 StackReference<mirror::Object>* GetFirstHandleScopeEntry() 1456 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1457 return handle_scope_->GetHandle(0).GetReference(); 1458 } 1459 1460 jobject GetFirstHandleScopeJObject() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1461 return handle_scope_->GetHandle(0).ToJObject(); 1462 } 1463 1464 void* GetBottomOfUsedArea() { 1465 return bottom_of_used_area_; 1466 } 1467 1468 private: 1469 // A class to fill a JNI call. Adds reference/handle-scope management to FillNativeCall. 1470 class FillJniCall FINAL : public FillNativeCall { 1471 public: 1472 FillJniCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, 1473 HandleScope* handle_scope) : FillNativeCall(gpr_regs, fpr_regs, stack_args), 1474 handle_scope_(handle_scope), cur_entry_(0) {} 1475 1476 uintptr_t PushHandle(mirror::Object* ref) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1477 1478 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, HandleScope* scope) { 1479 FillNativeCall::Reset(gpr_regs, fpr_regs, stack_args); 1480 handle_scope_ = scope; 1481 cur_entry_ = 0U; 1482 } 1483 1484 void ResetRemainingScopeSlots() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1485 // Initialize padding entries. 1486 size_t expected_slots = handle_scope_->NumberOfReferences(); 1487 while (cur_entry_ < expected_slots) { 1488 handle_scope_->GetMutableHandle(cur_entry_++).Assign(nullptr); 1489 } 1490 DCHECK_NE(cur_entry_, 0U); 1491 } 1492 1493 private: 1494 HandleScope* handle_scope_; 1495 size_t cur_entry_; 1496 }; 1497 1498 HandleScope* handle_scope_; 1499 FillJniCall jni_call_; 1500 void* bottom_of_used_area_; 1501 1502 BuildNativeCallFrameStateMachine<FillJniCall> sm_; 1503 1504 DISALLOW_COPY_AND_ASSIGN(BuildGenericJniFrameVisitor); 1505}; 1506 1507uintptr_t BuildGenericJniFrameVisitor::FillJniCall::PushHandle(mirror::Object* ref) { 1508 uintptr_t tmp; 1509 MutableHandle<mirror::Object> h = handle_scope_->GetMutableHandle(cur_entry_); 1510 h.Assign(ref); 1511 tmp = reinterpret_cast<uintptr_t>(h.ToJObject()); 1512 cur_entry_++; 1513 return tmp; 1514} 1515 1516void BuildGenericJniFrameVisitor::Visit() { 1517 Primitive::Type type = GetParamPrimitiveType(); 1518 switch (type) { 1519 case Primitive::kPrimLong: { 1520 jlong long_arg; 1521 if (IsSplitLongOrDouble()) { 1522 long_arg = ReadSplitLongParam(); 1523 } else { 1524 long_arg = *reinterpret_cast<jlong*>(GetParamAddress()); 1525 } 1526 sm_.AdvanceLong(long_arg); 1527 break; 1528 } 1529 case Primitive::kPrimDouble: { 1530 uint64_t double_arg; 1531 if (IsSplitLongOrDouble()) { 1532 // Read into union so that we don't case to a double. 1533 double_arg = ReadSplitLongParam(); 1534 } else { 1535 double_arg = *reinterpret_cast<uint64_t*>(GetParamAddress()); 1536 } 1537 sm_.AdvanceDouble(double_arg); 1538 break; 1539 } 1540 case Primitive::kPrimNot: { 1541 StackReference<mirror::Object>* stack_ref = 1542 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 1543 sm_.AdvanceHandleScope(stack_ref->AsMirrorPtr()); 1544 break; 1545 } 1546 case Primitive::kPrimFloat: 1547 sm_.AdvanceFloat(*reinterpret_cast<float*>(GetParamAddress())); 1548 break; 1549 case Primitive::kPrimBoolean: // Fall-through. 1550 case Primitive::kPrimByte: // Fall-through. 1551 case Primitive::kPrimChar: // Fall-through. 1552 case Primitive::kPrimShort: // Fall-through. 1553 case Primitive::kPrimInt: // Fall-through. 1554 sm_.AdvanceInt(*reinterpret_cast<jint*>(GetParamAddress())); 1555 break; 1556 case Primitive::kPrimVoid: 1557 LOG(FATAL) << "UNREACHABLE"; 1558 break; 1559 } 1560} 1561 1562void BuildGenericJniFrameVisitor::FinalizeHandleScope(Thread* self) { 1563 // Clear out rest of the scope. 1564 jni_call_.ResetRemainingScopeSlots(); 1565 // Install HandleScope. 1566 self->PushHandleScope(handle_scope_); 1567} 1568 1569#if defined(__arm__) || defined(__aarch64__) 1570extern "C" void* artFindNativeMethod(); 1571#else 1572extern "C" void* artFindNativeMethod(Thread* self); 1573#endif 1574 1575uint64_t artQuickGenericJniEndJNIRef(Thread* self, uint32_t cookie, jobject l, jobject lock) { 1576 if (lock != nullptr) { 1577 return reinterpret_cast<uint64_t>(JniMethodEndWithReferenceSynchronized(l, cookie, lock, self)); 1578 } else { 1579 return reinterpret_cast<uint64_t>(JniMethodEndWithReference(l, cookie, self)); 1580 } 1581} 1582 1583void artQuickGenericJniEndJNINonRef(Thread* self, uint32_t cookie, jobject lock) { 1584 if (lock != nullptr) { 1585 JniMethodEndSynchronized(cookie, lock, self); 1586 } else { 1587 JniMethodEnd(cookie, self); 1588 } 1589} 1590 1591/* 1592 * Initializes an alloca region assumed to be directly below sp for a native call: 1593 * Create a HandleScope and call stack and fill a mini stack with values to be pushed to registers. 1594 * The final element on the stack is a pointer to the native code. 1595 * 1596 * On entry, the stack has a standard callee-save frame above sp, and an alloca below it. 1597 * We need to fix this, as the handle scope needs to go into the callee-save frame. 1598 * 1599 * The return of this function denotes: 1600 * 1) How many bytes of the alloca can be released, if the value is non-negative. 1601 * 2) An error, if the value is negative. 1602 */ 1603extern "C" TwoWordReturn artQuickGenericJniTrampoline(Thread* self, 1604 StackReference<mirror::ArtMethod>* sp) 1605 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1606 mirror::ArtMethod* called = sp->AsMirrorPtr(); 1607 DCHECK(called->IsNative()) << PrettyMethod(called, true); 1608 uint32_t shorty_len = 0; 1609 const char* shorty = called->GetShorty(&shorty_len); 1610 1611 // Run the visitor. 1612 BuildGenericJniFrameVisitor visitor(self, called->IsStatic(), shorty, shorty_len, &sp); 1613 visitor.VisitArguments(); 1614 visitor.FinalizeHandleScope(self); 1615 1616 // Fix up managed-stack things in Thread. 1617 self->SetTopOfStack(sp, 0); 1618 1619 self->VerifyStack(); 1620 1621 // Start JNI, save the cookie. 1622 uint32_t cookie; 1623 if (called->IsSynchronized()) { 1624 cookie = JniMethodStartSynchronized(visitor.GetFirstHandleScopeJObject(), self); 1625 if (self->IsExceptionPending()) { 1626 self->PopHandleScope(); 1627 // A negative value denotes an error. 1628 return GetTwoWordFailureValue(); 1629 } 1630 } else { 1631 cookie = JniMethodStart(self); 1632 } 1633 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 1634 *(sp32 - 1) = cookie; 1635 1636 // Retrieve the stored native code. 1637 const void* nativeCode = called->GetNativeMethod(); 1638 1639 // There are two cases for the content of nativeCode: 1640 // 1) Pointer to the native function. 1641 // 2) Pointer to the trampoline for native code binding. 1642 // In the second case, we need to execute the binding and continue with the actual native function 1643 // pointer. 1644 DCHECK(nativeCode != nullptr); 1645 if (nativeCode == GetJniDlsymLookupStub()) { 1646#if defined(__arm__) || defined(__aarch64__) 1647 nativeCode = artFindNativeMethod(); 1648#else 1649 nativeCode = artFindNativeMethod(self); 1650#endif 1651 1652 if (nativeCode == nullptr) { 1653 DCHECK(self->IsExceptionPending()); // There should be an exception pending now. 1654 1655 // End JNI, as the assembly will move to deliver the exception. 1656 jobject lock = called->IsSynchronized() ? visitor.GetFirstHandleScopeJObject() : nullptr; 1657 if (shorty[0] == 'L') { 1658 artQuickGenericJniEndJNIRef(self, cookie, nullptr, lock); 1659 } else { 1660 artQuickGenericJniEndJNINonRef(self, cookie, lock); 1661 } 1662 1663 return GetTwoWordFailureValue(); 1664 } 1665 // Note that the native code pointer will be automatically set by artFindNativeMethod(). 1666 } 1667 1668 // Return native code addr(lo) and bottom of alloca address(hi). 1669 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(visitor.GetBottomOfUsedArea()), 1670 reinterpret_cast<uintptr_t>(nativeCode)); 1671} 1672 1673/* 1674 * Is called after the native JNI code. Responsible for cleanup (handle scope, saved state) and 1675 * unlocking. 1676 */ 1677extern "C" uint64_t artQuickGenericJniEndTrampoline(Thread* self, jvalue result, uint64_t result_f) 1678 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1679 StackReference<mirror::ArtMethod>* sp = self->GetManagedStack()->GetTopQuickFrame(); 1680 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 1681 mirror::ArtMethod* called = sp->AsMirrorPtr(); 1682 uint32_t cookie = *(sp32 - 1); 1683 1684 jobject lock = nullptr; 1685 if (called->IsSynchronized()) { 1686 HandleScope* table = reinterpret_cast<HandleScope*>(reinterpret_cast<uint8_t*>(sp) 1687 + sizeof(StackReference<mirror::ArtMethod>)); 1688 lock = table->GetHandle(0).ToJObject(); 1689 } 1690 1691 char return_shorty_char = called->GetShorty()[0]; 1692 1693 if (return_shorty_char == 'L') { 1694 return artQuickGenericJniEndJNIRef(self, cookie, result.l, lock); 1695 } else { 1696 artQuickGenericJniEndJNINonRef(self, cookie, lock); 1697 1698 switch (return_shorty_char) { 1699 case 'F': { 1700 if (kRuntimeISA == kX86) { 1701 // Convert back the result to float. 1702 double d = bit_cast<uint64_t, double>(result_f); 1703 return bit_cast<float, uint32_t>(static_cast<float>(d)); 1704 } else { 1705 return result_f; 1706 } 1707 } 1708 case 'D': 1709 return result_f; 1710 case 'Z': 1711 return result.z; 1712 case 'B': 1713 return result.b; 1714 case 'C': 1715 return result.c; 1716 case 'S': 1717 return result.s; 1718 case 'I': 1719 return result.i; 1720 case 'J': 1721 return result.j; 1722 case 'V': 1723 return 0; 1724 default: 1725 LOG(FATAL) << "Unexpected return shorty character " << return_shorty_char; 1726 return 0; 1727 } 1728 } 1729} 1730 1731// We use TwoWordReturn to optimize scalar returns. We use the hi value for code, and the lo value 1732// for the method pointer. 1733// 1734// It is valid to use this, as at the usage points here (returns from C functions) we are assuming 1735// to hold the mutator lock (see SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) annotations). 1736 1737template<InvokeType type, bool access_check> 1738static TwoWordReturn artInvokeCommon(uint32_t method_idx, mirror::Object* this_object, 1739 mirror::ArtMethod* caller_method, 1740 Thread* self, StackReference<mirror::ArtMethod>* sp); 1741 1742template<InvokeType type, bool access_check> 1743static TwoWordReturn artInvokeCommon(uint32_t method_idx, mirror::Object* this_object, 1744 mirror::ArtMethod* caller_method, 1745 Thread* self, StackReference<mirror::ArtMethod>* sp) { 1746 mirror::ArtMethod* method = FindMethodFast(method_idx, this_object, caller_method, access_check, 1747 type); 1748 if (UNLIKELY(method == nullptr)) { 1749 FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsAndArgs); 1750 const DexFile* dex_file = caller_method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1751 uint32_t shorty_len; 1752 const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(method_idx), &shorty_len); 1753 { 1754 // Remember the args in case a GC happens in FindMethodFromCode. 1755 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1756 RememberForGcArgumentVisitor visitor(sp, type == kStatic, shorty, shorty_len, &soa); 1757 visitor.VisitArguments(); 1758 method = FindMethodFromCode<type, access_check>(method_idx, &this_object, &caller_method, 1759 self); 1760 visitor.FixupReferences(); 1761 } 1762 1763 if (UNLIKELY(method == NULL)) { 1764 CHECK(self->IsExceptionPending()); 1765 return GetTwoWordFailureValue(); // Failure. 1766 } 1767 } 1768 DCHECK(!self->IsExceptionPending()); 1769 const void* code = method->GetEntryPointFromQuickCompiledCode(); 1770 1771 // When we return, the caller will branch to this address, so it had better not be 0! 1772 DCHECK(code != nullptr) << "Code was NULL in method: " << PrettyMethod(method) 1773 << " location: " 1774 << method->GetDexFile()->GetLocation(); 1775 1776 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 1777 reinterpret_cast<uintptr_t>(method)); 1778} 1779 1780// Explicit artInvokeCommon template function declarations to please analysis tool. 1781#define EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(type, access_check) \ 1782 template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) \ 1783 TwoWordReturn artInvokeCommon<type, access_check>(uint32_t method_idx, \ 1784 mirror::Object* this_object, \ 1785 mirror::ArtMethod* caller_method, \ 1786 Thread* self, \ 1787 StackReference<mirror::ArtMethod>* sp) \ 1788 1789EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, false); 1790EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, true); 1791EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, false); 1792EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, true); 1793EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, false); 1794EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, true); 1795EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, false); 1796EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, true); 1797EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, false); 1798EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, true); 1799#undef EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL 1800 1801// See comments in runtime_support_asm.S 1802extern "C" TwoWordReturn artInvokeInterfaceTrampolineWithAccessCheck( 1803 uint32_t method_idx, mirror::Object* this_object, 1804 mirror::ArtMethod* caller_method, Thread* self, 1805 StackReference<mirror::ArtMethod>* sp) 1806 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1807 return artInvokeCommon<kInterface, true>(method_idx, this_object, 1808 caller_method, self, sp); 1809} 1810 1811extern "C" TwoWordReturn artInvokeDirectTrampolineWithAccessCheck( 1812 uint32_t method_idx, mirror::Object* this_object, 1813 mirror::ArtMethod* caller_method, Thread* self, 1814 StackReference<mirror::ArtMethod>* sp) 1815 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1816 return artInvokeCommon<kDirect, true>(method_idx, this_object, caller_method, 1817 self, sp); 1818} 1819 1820extern "C" TwoWordReturn artInvokeStaticTrampolineWithAccessCheck( 1821 uint32_t method_idx, mirror::Object* this_object, 1822 mirror::ArtMethod* caller_method, Thread* self, 1823 StackReference<mirror::ArtMethod>* sp) 1824 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1825 return artInvokeCommon<kStatic, true>(method_idx, this_object, caller_method, 1826 self, sp); 1827} 1828 1829extern "C" TwoWordReturn artInvokeSuperTrampolineWithAccessCheck( 1830 uint32_t method_idx, mirror::Object* this_object, 1831 mirror::ArtMethod* caller_method, Thread* self, 1832 StackReference<mirror::ArtMethod>* sp) 1833 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1834 return artInvokeCommon<kSuper, true>(method_idx, this_object, caller_method, 1835 self, sp); 1836} 1837 1838extern "C" TwoWordReturn artInvokeVirtualTrampolineWithAccessCheck( 1839 uint32_t method_idx, mirror::Object* this_object, 1840 mirror::ArtMethod* caller_method, Thread* self, 1841 StackReference<mirror::ArtMethod>* sp) 1842 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1843 return artInvokeCommon<kVirtual, true>(method_idx, this_object, caller_method, 1844 self, sp); 1845} 1846 1847// Determine target of interface dispatch. This object is known non-null. 1848extern "C" TwoWordReturn artInvokeInterfaceTrampoline(mirror::ArtMethod* interface_method, 1849 mirror::Object* this_object, 1850 mirror::ArtMethod* caller_method, 1851 Thread* self, 1852 StackReference<mirror::ArtMethod>* sp) 1853 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1854 mirror::ArtMethod* method; 1855 if (LIKELY(interface_method->GetDexMethodIndex() != DexFile::kDexNoIndex)) { 1856 method = this_object->GetClass()->FindVirtualMethodForInterface(interface_method); 1857 if (UNLIKELY(method == NULL)) { 1858 FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsAndArgs); 1859 ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(interface_method, this_object, 1860 caller_method); 1861 return GetTwoWordFailureValue(); // Failure. 1862 } 1863 } else { 1864 FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsAndArgs); 1865 DCHECK(interface_method == Runtime::Current()->GetResolutionMethod()); 1866 1867 // Find the caller PC. 1868 constexpr size_t pc_offset = GetCalleeSavePCOffset(kRuntimeISA, Runtime::kRefsAndArgs); 1869 uintptr_t caller_pc = *reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(sp) + pc_offset); 1870 1871 // Map the caller PC to a dex PC. 1872 uint32_t dex_pc = caller_method->ToDexPc(caller_pc); 1873 const DexFile::CodeItem* code = caller_method->GetCodeItem(); 1874 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 1875 const Instruction* instr = Instruction::At(&code->insns_[dex_pc]); 1876 Instruction::Code instr_code = instr->Opcode(); 1877 CHECK(instr_code == Instruction::INVOKE_INTERFACE || 1878 instr_code == Instruction::INVOKE_INTERFACE_RANGE) 1879 << "Unexpected call into interface trampoline: " << instr->DumpString(NULL); 1880 uint32_t dex_method_idx; 1881 if (instr_code == Instruction::INVOKE_INTERFACE) { 1882 dex_method_idx = instr->VRegB_35c(); 1883 } else { 1884 DCHECK_EQ(instr_code, Instruction::INVOKE_INTERFACE_RANGE); 1885 dex_method_idx = instr->VRegB_3rc(); 1886 } 1887 1888 const DexFile* dex_file = caller_method->GetDeclaringClass()->GetDexCache() 1889 ->GetDexFile(); 1890 uint32_t shorty_len; 1891 const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(dex_method_idx), 1892 &shorty_len); 1893 { 1894 // Remember the args in case a GC happens in FindMethodFromCode. 1895 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1896 RememberForGcArgumentVisitor visitor(sp, false, shorty, shorty_len, &soa); 1897 visitor.VisitArguments(); 1898 method = FindMethodFromCode<kInterface, false>(dex_method_idx, &this_object, &caller_method, 1899 self); 1900 visitor.FixupReferences(); 1901 } 1902 1903 if (UNLIKELY(method == nullptr)) { 1904 CHECK(self->IsExceptionPending()); 1905 return GetTwoWordFailureValue(); // Failure. 1906 } 1907 } 1908 const void* code = method->GetEntryPointFromQuickCompiledCode(); 1909 1910 // When we return, the caller will branch to this address, so it had better not be 0! 1911 DCHECK(code != nullptr) << "Code was NULL in method: " << PrettyMethod(method) 1912 << " location: " << method->GetDexFile()->GetLocation(); 1913 1914 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 1915 reinterpret_cast<uintptr_t>(method)); 1916} 1917 1918} // namespace art 1919