quick_trampoline_entrypoints.cc revision c6d86725521841637bdd9564e71be3d9691db20f
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 "entrypoints/runtime_asm_entrypoints.h" 23#include "gc/accounting/card_table-inl.h" 24#include "interpreter/interpreter.h" 25#include "method_reference.h" 26#include "mirror/art_method-inl.h" 27#include "mirror/class-inl.h" 28#include "mirror/dex_cache-inl.h" 29#include "mirror/object-inl.h" 30#include "mirror/object_array-inl.h" 31#include "runtime.h" 32#include "scoped_thread_state_change.h" 33 34namespace art { 35 36// Visits the arguments as saved to the stack by a Runtime::kRefAndArgs callee save frame. 37class QuickArgumentVisitor { 38 // Number of bytes for each out register in the caller method's frame. 39 static constexpr size_t kBytesStackArgLocation = 4; 40 // Frame size in bytes of a callee-save frame for RefsAndArgs. 41 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 42 GetCalleeSaveFrameSize(kRuntimeISA, Runtime::kRefsAndArgs); 43#if defined(__arm__) 44 // The callee save frame is pointed to by SP. 45 // | argN | | 46 // | ... | | 47 // | arg4 | | 48 // | arg3 spill | | Caller's frame 49 // | arg2 spill | | 50 // | arg1 spill | | 51 // | Method* | --- 52 // | LR | 53 // | ... | 4x6 bytes callee saves 54 // | R3 | 55 // | R2 | 56 // | R1 | 57 // | S15 | 58 // | : | 59 // | S0 | 60 // | | 4x2 bytes padding 61 // | Method* | <- sp 62 static constexpr bool kQuickSoftFloatAbi = kArm32QuickCodeUseSoftFloat; 63 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = !kArm32QuickCodeUseSoftFloat; 64 static constexpr size_t kNumQuickGprArgs = 3; 65 static constexpr size_t kNumQuickFprArgs = kArm32QuickCodeUseSoftFloat ? 0 : 16; 66 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 67 arm::ArmCalleeSaveFpr1Offset(Runtime::kRefsAndArgs); // Offset of first FPR arg. 68 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 69 arm::ArmCalleeSaveGpr1Offset(Runtime::kRefsAndArgs); // Offset of first GPR arg. 70 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 71 arm::ArmCalleeSaveLrOffset(Runtime::kRefsAndArgs); // Offset of return address. 72 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 73 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 74 } 75#elif defined(__aarch64__) 76 // The callee save frame is pointed to by SP. 77 // | argN | | 78 // | ... | | 79 // | arg4 | | 80 // | arg3 spill | | Caller's frame 81 // | arg2 spill | | 82 // | arg1 spill | | 83 // | Method* | --- 84 // | LR | 85 // | X29 | 86 // | : | 87 // | X20 | 88 // | X7 | 89 // | : | 90 // | X1 | 91 // | D7 | 92 // | : | 93 // | D0 | 94 // | | padding 95 // | Method* | <- sp 96 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 97 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 98 static constexpr size_t kNumQuickGprArgs = 7; // 7 arguments passed in GPRs. 99 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 100 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 101 arm64::Arm64CalleeSaveFpr1Offset(Runtime::kRefsAndArgs); // Offset of first FPR arg. 102 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 103 arm64::Arm64CalleeSaveGpr1Offset(Runtime::kRefsAndArgs); // Offset of first GPR arg. 104 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 105 arm64::Arm64CalleeSaveLrOffset(Runtime::kRefsAndArgs); // Offset of return address. 106 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 107 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 108 } 109#elif defined(__mips__) 110 // The callee save frame is pointed to by SP. 111 // | argN | | 112 // | ... | | 113 // | arg4 | | 114 // | arg3 spill | | Caller's frame 115 // | arg2 spill | | 116 // | arg1 spill | | 117 // | Method* | --- 118 // | RA | 119 // | ... | callee saves 120 // | A3 | arg3 121 // | A2 | arg2 122 // | A1 | arg1 123 // | A0/Method* | <- sp 124 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 125 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 126 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 127 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 128 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0; // Offset of first FPR arg. 129 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 16; // Offset of first GPR arg. 130 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 60; // Offset of return address. 131 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 132 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 133 } 134#elif defined(__i386__) 135 // The callee save frame is pointed to by SP. 136 // | argN | | 137 // | ... | | 138 // | arg4 | | 139 // | arg3 spill | | Caller's frame 140 // | arg2 spill | | 141 // | arg1 spill | | 142 // | Method* | --- 143 // | Return | 144 // | EBP,ESI,EDI | callee saves 145 // | EBX | arg3 146 // | EDX | arg2 147 // | ECX | arg1 148 // | EAX/Method* | <- sp 149 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 150 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 151 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 152 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 153 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0; // Offset of first FPR arg. 154 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4; // Offset of first GPR arg. 155 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 28; // Offset of return address. 156 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 157 return gpr_index * GetBytesPerGprSpillLocation(kRuntimeISA); 158 } 159#elif defined(__x86_64__) 160 // The callee save frame is pointed to by SP. 161 // | argN | | 162 // | ... | | 163 // | reg. arg spills | | Caller's frame 164 // | Method* | --- 165 // | Return | 166 // | R15 | callee save 167 // | R14 | callee save 168 // | R13 | callee save 169 // | R12 | callee save 170 // | R9 | arg5 171 // | R8 | arg4 172 // | RSI/R6 | arg1 173 // | RBP/R5 | callee save 174 // | RBX/R3 | callee save 175 // | RDX/R2 | arg2 176 // | RCX/R1 | arg3 177 // | XMM7 | float arg 8 178 // | XMM6 | float arg 7 179 // | XMM5 | float arg 6 180 // | XMM4 | float arg 5 181 // | XMM3 | float arg 4 182 // | XMM2 | float arg 3 183 // | XMM1 | float arg 2 184 // | XMM0 | float arg 1 185 // | Padding | 186 // | RDI/Method* | <- sp 187 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 188 static constexpr bool kQuickDoubleRegAlignedFloatBackFilled = false; 189 static constexpr size_t kNumQuickGprArgs = 5; // 5 arguments passed in GPRs. 190 static constexpr size_t kNumQuickFprArgs = 8; // 8 arguments passed in FPRs. 191 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 16; // Offset of first FPR arg. 192 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 80 + 4*8; // Offset of first GPR arg. 193 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 168 + 4*8; // Offset of return address. 194 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 195 switch (gpr_index) { 196 case 0: return (4 * GetBytesPerGprSpillLocation(kRuntimeISA)); 197 case 1: return (1 * GetBytesPerGprSpillLocation(kRuntimeISA)); 198 case 2: return (0 * GetBytesPerGprSpillLocation(kRuntimeISA)); 199 case 3: return (5 * GetBytesPerGprSpillLocation(kRuntimeISA)); 200 case 4: return (6 * GetBytesPerGprSpillLocation(kRuntimeISA)); 201 default: 202 LOG(FATAL) << "Unexpected GPR index: " << gpr_index; 203 return 0; 204 } 205 } 206#else 207#error "Unsupported architecture" 208#endif 209 210 public: 211 // Special handling for proxy methods. Proxy methods are instance methods so the 212 // 'this' object is the 1st argument. They also have the same frame layout as the 213 // kRefAndArgs runtime method. Since 'this' is a reference, it is located in the 214 // 1st GPR. 215 static mirror::Object* GetProxyThisObject(StackReference<mirror::ArtMethod>* sp) 216 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 217 CHECK(sp->AsMirrorPtr()->IsProxyMethod()); 218 CHECK_EQ(kQuickCalleeSaveFrame_RefAndArgs_FrameSize, sp->AsMirrorPtr()->GetFrameSizeInBytes()); 219 CHECK_GT(kNumQuickGprArgs, 0u); 220 constexpr uint32_t kThisGprIndex = 0u; // 'this' is in the 1st GPR. 221 size_t this_arg_offset = kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset + 222 GprIndexToGprOffset(kThisGprIndex); 223 uint8_t* this_arg_address = reinterpret_cast<uint8_t*>(sp) + this_arg_offset; 224 return reinterpret_cast<StackReference<mirror::Object>*>(this_arg_address)->AsMirrorPtr(); 225 } 226 227 static mirror::ArtMethod* GetCallingMethod(StackReference<mirror::ArtMethod>* sp) 228 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 229 DCHECK(sp->AsMirrorPtr()->IsCalleeSaveMethod()); 230 uint8_t* previous_sp = reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize; 231 return reinterpret_cast<StackReference<mirror::ArtMethod>*>(previous_sp)->AsMirrorPtr(); 232 } 233 234 // For the given quick ref and args quick frame, return the caller's PC. 235 static uintptr_t GetCallingPc(StackReference<mirror::ArtMethod>* sp) 236 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 237 DCHECK(sp->AsMirrorPtr()->IsCalleeSaveMethod()); 238 uint8_t* lr = reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_LrOffset; 239 return *reinterpret_cast<uintptr_t*>(lr); 240 } 241 242 QuickArgumentVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, const char* shorty, 243 uint32_t shorty_len) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 244 is_static_(is_static), shorty_(shorty), shorty_len_(shorty_len), 245 gpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset), 246 fpr_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset), 247 stack_args_(reinterpret_cast<uint8_t*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize 248 + sizeof(StackReference<mirror::ArtMethod>)), // Skip StackReference<ArtMethod>. 249 gpr_index_(0), fpr_index_(0), fpr_double_index_(0), stack_index_(0), 250 cur_type_(Primitive::kPrimVoid), is_split_long_or_double_(false) { 251 static_assert(kQuickSoftFloatAbi == (kNumQuickFprArgs == 0), 252 "Number of Quick FPR arguments unexpected"); 253 static_assert(!(kQuickSoftFloatAbi && kQuickDoubleRegAlignedFloatBackFilled), 254 "Double alignment unexpected"); 255 // For register alignment, we want to assume that counters(fpr_double_index_) are even if the 256 // next register is even. 257 static_assert(!kQuickDoubleRegAlignedFloatBackFilled || kNumQuickFprArgs % 2 == 0, 258 "Number of Quick FPR arguments not even"); 259 } 260 261 virtual ~QuickArgumentVisitor() {} 262 263 virtual void Visit() = 0; 264 265 Primitive::Type GetParamPrimitiveType() const { 266 return cur_type_; 267 } 268 269 uint8_t* GetParamAddress() const { 270 if (!kQuickSoftFloatAbi) { 271 Primitive::Type type = GetParamPrimitiveType(); 272 if (UNLIKELY((type == Primitive::kPrimDouble) || (type == Primitive::kPrimFloat))) { 273 if (type == Primitive::kPrimDouble && kQuickDoubleRegAlignedFloatBackFilled) { 274 if (fpr_double_index_ + 2 < kNumQuickFprArgs + 1) { 275 return fpr_args_ + (fpr_double_index_ * GetBytesPerFprSpillLocation(kRuntimeISA)); 276 } 277 } else if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 278 return fpr_args_ + (fpr_index_ * GetBytesPerFprSpillLocation(kRuntimeISA)); 279 } 280 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 281 } 282 } 283 if (gpr_index_ < kNumQuickGprArgs) { 284 return gpr_args_ + GprIndexToGprOffset(gpr_index_); 285 } 286 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 287 } 288 289 bool IsSplitLongOrDouble() const { 290 if ((GetBytesPerGprSpillLocation(kRuntimeISA) == 4) || (GetBytesPerFprSpillLocation(kRuntimeISA) == 4)) { 291 return is_split_long_or_double_; 292 } else { 293 return false; // An optimization for when GPR and FPRs are 64bit. 294 } 295 } 296 297 bool IsParamAReference() const { 298 return GetParamPrimitiveType() == Primitive::kPrimNot; 299 } 300 301 bool IsParamALongOrDouble() const { 302 Primitive::Type type = GetParamPrimitiveType(); 303 return type == Primitive::kPrimLong || type == Primitive::kPrimDouble; 304 } 305 306 uint64_t ReadSplitLongParam() const { 307 // The splitted long is always available through the stack. 308 return *reinterpret_cast<uint64_t*>(stack_args_ 309 + stack_index_ * kBytesStackArgLocation); 310 } 311 312 void VisitArguments() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 313 // (a) 'stack_args_' should point to the first method's argument 314 // (b) whatever the argument type it is, the 'stack_index_' should 315 // be moved forward along with every visiting. 316 gpr_index_ = 0; 317 fpr_index_ = 0; 318 if (kQuickDoubleRegAlignedFloatBackFilled) { 319 fpr_double_index_ = 0; 320 } 321 stack_index_ = 0; 322 if (!is_static_) { // Handle this. 323 cur_type_ = Primitive::kPrimNot; 324 is_split_long_or_double_ = false; 325 Visit(); 326 stack_index_++; 327 if (kNumQuickGprArgs > 0) { 328 gpr_index_++; 329 } 330 } 331 for (uint32_t shorty_index = 1; shorty_index < shorty_len_; ++shorty_index) { 332 cur_type_ = Primitive::GetType(shorty_[shorty_index]); 333 switch (cur_type_) { 334 case Primitive::kPrimNot: 335 case Primitive::kPrimBoolean: 336 case Primitive::kPrimByte: 337 case Primitive::kPrimChar: 338 case Primitive::kPrimShort: 339 case Primitive::kPrimInt: 340 is_split_long_or_double_ = false; 341 Visit(); 342 stack_index_++; 343 if (gpr_index_ < kNumQuickGprArgs) { 344 gpr_index_++; 345 } 346 break; 347 case Primitive::kPrimFloat: 348 is_split_long_or_double_ = false; 349 Visit(); 350 stack_index_++; 351 if (kQuickSoftFloatAbi) { 352 if (gpr_index_ < kNumQuickGprArgs) { 353 gpr_index_++; 354 } 355 } else { 356 if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 357 fpr_index_++; 358 if (kQuickDoubleRegAlignedFloatBackFilled) { 359 // Double should not overlap with float. 360 // For example, if fpr_index_ = 3, fpr_double_index_ should be at least 4. 361 fpr_double_index_ = std::max(fpr_double_index_, RoundUp(fpr_index_, 2)); 362 // Float should not overlap with double. 363 if (fpr_index_ % 2 == 0) { 364 fpr_index_ = std::max(fpr_double_index_, fpr_index_); 365 } 366 } 367 } 368 } 369 break; 370 case Primitive::kPrimDouble: 371 case Primitive::kPrimLong: 372 if (kQuickSoftFloatAbi || (cur_type_ == Primitive::kPrimLong)) { 373 is_split_long_or_double_ = (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) && 374 ((gpr_index_ + 1) == kNumQuickGprArgs); 375 Visit(); 376 if (kBytesStackArgLocation == 4) { 377 stack_index_+= 2; 378 } else { 379 CHECK_EQ(kBytesStackArgLocation, 8U); 380 stack_index_++; 381 } 382 if (gpr_index_ < kNumQuickGprArgs) { 383 gpr_index_++; 384 if (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) { 385 if (gpr_index_ < kNumQuickGprArgs) { 386 gpr_index_++; 387 } 388 } 389 } 390 } else { 391 is_split_long_or_double_ = (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) && 392 ((fpr_index_ + 1) == kNumQuickFprArgs) && !kQuickDoubleRegAlignedFloatBackFilled; 393 Visit(); 394 if (kBytesStackArgLocation == 4) { 395 stack_index_+= 2; 396 } else { 397 CHECK_EQ(kBytesStackArgLocation, 8U); 398 stack_index_++; 399 } 400 if (kQuickDoubleRegAlignedFloatBackFilled) { 401 if (fpr_double_index_ + 2 < kNumQuickFprArgs + 1) { 402 fpr_double_index_ += 2; 403 // Float should not overlap with double. 404 if (fpr_index_ % 2 == 0) { 405 fpr_index_ = std::max(fpr_double_index_, fpr_index_); 406 } 407 } 408 } else if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 409 fpr_index_++; 410 if (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) { 411 if (fpr_index_ + 1 < kNumQuickFprArgs + 1) { 412 fpr_index_++; 413 } 414 } 415 } 416 } 417 break; 418 default: 419 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty_; 420 } 421 } 422 } 423 424 protected: 425 const bool is_static_; 426 const char* const shorty_; 427 const uint32_t shorty_len_; 428 429 private: 430 uint8_t* const gpr_args_; // Address of GPR arguments in callee save frame. 431 uint8_t* const fpr_args_; // Address of FPR arguments in callee save frame. 432 uint8_t* const stack_args_; // Address of stack arguments in caller's frame. 433 uint32_t gpr_index_; // Index into spilled GPRs. 434 // Index into spilled FPRs. 435 // In case kQuickDoubleRegAlignedFloatBackFilled, it may index a hole while fpr_double_index_ 436 // holds a higher register number. 437 uint32_t fpr_index_; 438 // Index into spilled FPRs for aligned double. 439 // Only used when kQuickDoubleRegAlignedFloatBackFilled. Next available double register indexed in 440 // terms of singles, may be behind fpr_index. 441 uint32_t fpr_double_index_; 442 uint32_t stack_index_; // Index into arguments on the stack. 443 // The current type of argument during VisitArguments. 444 Primitive::Type cur_type_; 445 // Does a 64bit parameter straddle the register and stack arguments? 446 bool is_split_long_or_double_; 447}; 448 449// Returns the 'this' object of a proxy method. This function is only used by StackVisitor. It 450// allows to use the QuickArgumentVisitor constants without moving all the code in its own module. 451extern "C" mirror::Object* artQuickGetProxyThisObject(StackReference<mirror::ArtMethod>* sp) 452 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 453 return QuickArgumentVisitor::GetProxyThisObject(sp); 454} 455 456// Visits arguments on the stack placing them into the shadow frame. 457class BuildQuickShadowFrameVisitor FINAL : public QuickArgumentVisitor { 458 public: 459 BuildQuickShadowFrameVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, 460 const char* shorty, uint32_t shorty_len, ShadowFrame* sf, 461 size_t first_arg_reg) : 462 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), sf_(sf), cur_reg_(first_arg_reg) {} 463 464 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 465 466 private: 467 ShadowFrame* const sf_; 468 uint32_t cur_reg_; 469 470 DISALLOW_COPY_AND_ASSIGN(BuildQuickShadowFrameVisitor); 471}; 472 473void BuildQuickShadowFrameVisitor::Visit() { 474 Primitive::Type type = GetParamPrimitiveType(); 475 switch (type) { 476 case Primitive::kPrimLong: // Fall-through. 477 case Primitive::kPrimDouble: 478 if (IsSplitLongOrDouble()) { 479 sf_->SetVRegLong(cur_reg_, ReadSplitLongParam()); 480 } else { 481 sf_->SetVRegLong(cur_reg_, *reinterpret_cast<jlong*>(GetParamAddress())); 482 } 483 ++cur_reg_; 484 break; 485 case Primitive::kPrimNot: { 486 StackReference<mirror::Object>* stack_ref = 487 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 488 sf_->SetVRegReference(cur_reg_, stack_ref->AsMirrorPtr()); 489 } 490 break; 491 case Primitive::kPrimBoolean: // Fall-through. 492 case Primitive::kPrimByte: // Fall-through. 493 case Primitive::kPrimChar: // Fall-through. 494 case Primitive::kPrimShort: // Fall-through. 495 case Primitive::kPrimInt: // Fall-through. 496 case Primitive::kPrimFloat: 497 sf_->SetVReg(cur_reg_, *reinterpret_cast<jint*>(GetParamAddress())); 498 break; 499 case Primitive::kPrimVoid: 500 LOG(FATAL) << "UNREACHABLE"; 501 UNREACHABLE(); 502 } 503 ++cur_reg_; 504} 505 506extern "C" uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 507 StackReference<mirror::ArtMethod>* sp) 508 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 509 // Ensure we don't get thread suspension until the object arguments are safely in the shadow 510 // frame. 511 ScopedQuickEntrypointChecks sqec(self); 512 513 if (method->IsAbstract()) { 514 ThrowAbstractMethodError(method); 515 return 0; 516 } else { 517 DCHECK(!method->IsNative()) << PrettyMethod(method); 518 const char* old_cause = self->StartAssertNoThreadSuspension( 519 "Building interpreter shadow frame"); 520 const DexFile::CodeItem* code_item = method->GetCodeItem(); 521 DCHECK(code_item != nullptr) << PrettyMethod(method); 522 uint16_t num_regs = code_item->registers_size_; 523 void* memory = alloca(ShadowFrame::ComputeSize(num_regs)); 524 // No last shadow coming from quick. 525 ShadowFrame* shadow_frame(ShadowFrame::Create(num_regs, nullptr, method, 0, memory)); 526 size_t first_arg_reg = code_item->registers_size_ - code_item->ins_size_; 527 uint32_t shorty_len = 0; 528 const char* shorty = method->GetShorty(&shorty_len); 529 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, method->IsStatic(), shorty, shorty_len, 530 shadow_frame, first_arg_reg); 531 shadow_frame_builder.VisitArguments(); 532 const bool needs_initialization = 533 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 534 // Push a transition back into managed code onto the linked list in thread. 535 ManagedStack fragment; 536 self->PushManagedStackFragment(&fragment); 537 self->PushShadowFrame(shadow_frame); 538 self->EndAssertNoThreadSuspension(old_cause); 539 540 if (needs_initialization) { 541 // Ensure static method's class is initialized. 542 StackHandleScope<1> hs(self); 543 Handle<mirror::Class> h_class(hs.NewHandle(shadow_frame->GetMethod()->GetDeclaringClass())); 544 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) { 545 DCHECK(Thread::Current()->IsExceptionPending()) << PrettyMethod(shadow_frame->GetMethod()); 546 self->PopManagedStackFragment(fragment); 547 return 0; 548 } 549 } 550 JValue result = interpreter::EnterInterpreterFromEntryPoint(self, code_item, shadow_frame); 551 // Pop transition. 552 self->PopManagedStackFragment(fragment); 553 // No need to restore the args since the method has already been run by the interpreter. 554 return result.GetJ(); 555 } 556} 557 558// Visits arguments on the stack placing them into the args vector, Object* arguments are converted 559// to jobjects. 560class BuildQuickArgumentVisitor FINAL : public QuickArgumentVisitor { 561 public: 562 BuildQuickArgumentVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, 563 const char* shorty, uint32_t shorty_len, 564 ScopedObjectAccessUnchecked* soa, std::vector<jvalue>* args) : 565 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa), args_(args) {} 566 567 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 568 569 void FixupReferences() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 570 571 private: 572 ScopedObjectAccessUnchecked* const soa_; 573 std::vector<jvalue>* const args_; 574 // References which we must update when exiting in case the GC moved the objects. 575 std::vector<std::pair<jobject, StackReference<mirror::Object>*>> references_; 576 577 DISALLOW_COPY_AND_ASSIGN(BuildQuickArgumentVisitor); 578}; 579 580void BuildQuickArgumentVisitor::Visit() { 581 jvalue val; 582 Primitive::Type type = GetParamPrimitiveType(); 583 switch (type) { 584 case Primitive::kPrimNot: { 585 StackReference<mirror::Object>* stack_ref = 586 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 587 val.l = soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 588 references_.push_back(std::make_pair(val.l, stack_ref)); 589 break; 590 } 591 case Primitive::kPrimLong: // Fall-through. 592 case Primitive::kPrimDouble: 593 if (IsSplitLongOrDouble()) { 594 val.j = ReadSplitLongParam(); 595 } else { 596 val.j = *reinterpret_cast<jlong*>(GetParamAddress()); 597 } 598 break; 599 case Primitive::kPrimBoolean: // Fall-through. 600 case Primitive::kPrimByte: // Fall-through. 601 case Primitive::kPrimChar: // Fall-through. 602 case Primitive::kPrimShort: // Fall-through. 603 case Primitive::kPrimInt: // Fall-through. 604 case Primitive::kPrimFloat: 605 val.i = *reinterpret_cast<jint*>(GetParamAddress()); 606 break; 607 case Primitive::kPrimVoid: 608 LOG(FATAL) << "UNREACHABLE"; 609 UNREACHABLE(); 610 } 611 args_->push_back(val); 612} 613 614void BuildQuickArgumentVisitor::FixupReferences() { 615 // Fixup any references which may have changed. 616 for (const auto& pair : references_) { 617 pair.second->Assign(soa_->Decode<mirror::Object*>(pair.first)); 618 soa_->Env()->DeleteLocalRef(pair.first); 619 } 620} 621 622// Handler for invocation on proxy methods. On entry a frame will exist for the proxy object method 623// which is responsible for recording callee save registers. We explicitly place into jobjects the 624// incoming reference arguments (so they survive GC). We invoke the invocation handler, which is a 625// field within the proxy object, which will box the primitive arguments and deal with error cases. 626extern "C" uint64_t artQuickProxyInvokeHandler(mirror::ArtMethod* proxy_method, 627 mirror::Object* receiver, 628 Thread* self, StackReference<mirror::ArtMethod>* sp) 629 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 630 DCHECK(proxy_method->IsProxyMethod()) << PrettyMethod(proxy_method); 631 DCHECK(receiver->GetClass()->IsProxyClass()) << PrettyMethod(proxy_method); 632 // Ensure we don't get thread suspension until the object arguments are safely in jobjects. 633 const char* old_cause = 634 self->StartAssertNoThreadSuspension("Adding to IRT proxy object arguments"); 635 // Register the top of the managed stack, making stack crawlable. 636 DCHECK_EQ(sp->AsMirrorPtr(), proxy_method) << PrettyMethod(proxy_method); 637 DCHECK_EQ(proxy_method->GetFrameSizeInBytes(), 638 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs)->GetFrameSizeInBytes()) 639 << PrettyMethod(proxy_method); 640 self->VerifyStack(); 641 // Start new JNI local reference state. 642 JNIEnvExt* env = self->GetJniEnv(); 643 ScopedObjectAccessUnchecked soa(env); 644 ScopedJniEnvLocalRefState env_state(env); 645 // Create local ref. copies of proxy method and the receiver. 646 jobject rcvr_jobj = soa.AddLocalReference<jobject>(receiver); 647 648 // Placing arguments into args vector and remove the receiver. 649 mirror::ArtMethod* non_proxy_method = proxy_method->GetInterfaceMethodIfProxy(); 650 CHECK(!non_proxy_method->IsStatic()) << PrettyMethod(proxy_method) << " " 651 << PrettyMethod(non_proxy_method); 652 std::vector<jvalue> args; 653 uint32_t shorty_len = 0; 654 const char* shorty = proxy_method->GetShorty(&shorty_len); 655 BuildQuickArgumentVisitor local_ref_visitor(sp, false, shorty, shorty_len, &soa, &args); 656 657 local_ref_visitor.VisitArguments(); 658 DCHECK_GT(args.size(), 0U) << PrettyMethod(proxy_method); 659 args.erase(args.begin()); 660 661 // Convert proxy method into expected interface method. 662 mirror::ArtMethod* interface_method = proxy_method->FindOverriddenMethod(); 663 DCHECK(interface_method != nullptr) << PrettyMethod(proxy_method); 664 DCHECK(!interface_method->IsProxyMethod()) << PrettyMethod(interface_method); 665 jobject interface_method_jobj = soa.AddLocalReference<jobject>(interface_method); 666 667 // All naked Object*s should now be in jobjects, so its safe to go into the main invoke code 668 // that performs allocations. 669 self->EndAssertNoThreadSuspension(old_cause); 670 JValue result = InvokeProxyInvocationHandler(soa, shorty, rcvr_jobj, interface_method_jobj, args); 671 // Restore references which might have moved. 672 local_ref_visitor.FixupReferences(); 673 return result.GetJ(); 674} 675 676// Read object references held in arguments from quick frames and place in a JNI local references, 677// so they don't get garbage collected. 678class RememberForGcArgumentVisitor FINAL : public QuickArgumentVisitor { 679 public: 680 RememberForGcArgumentVisitor(StackReference<mirror::ArtMethod>* sp, bool is_static, 681 const char* shorty, uint32_t shorty_len, 682 ScopedObjectAccessUnchecked* soa) : 683 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa) {} 684 685 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 686 687 void FixupReferences() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 688 689 private: 690 ScopedObjectAccessUnchecked* const soa_; 691 // References which we must update when exiting in case the GC moved the objects. 692 std::vector<std::pair<jobject, StackReference<mirror::Object>*> > references_; 693 694 DISALLOW_COPY_AND_ASSIGN(RememberForGcArgumentVisitor); 695}; 696 697void RememberForGcArgumentVisitor::Visit() { 698 if (IsParamAReference()) { 699 StackReference<mirror::Object>* stack_ref = 700 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 701 jobject reference = 702 soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 703 references_.push_back(std::make_pair(reference, stack_ref)); 704 } 705} 706 707void RememberForGcArgumentVisitor::FixupReferences() { 708 // Fixup any references which may have changed. 709 for (const auto& pair : references_) { 710 pair.second->Assign(soa_->Decode<mirror::Object*>(pair.first)); 711 soa_->Env()->DeleteLocalRef(pair.first); 712 } 713} 714 715// Lazily resolve a method for quick. Called by stub code. 716extern "C" const void* artQuickResolutionTrampoline(mirror::ArtMethod* called, 717 mirror::Object* receiver, 718 Thread* self, 719 StackReference<mirror::ArtMethod>* sp) 720 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 721 ScopedQuickEntrypointChecks sqec(self); 722 // Start new JNI local reference state 723 JNIEnvExt* env = self->GetJniEnv(); 724 ScopedObjectAccessUnchecked soa(env); 725 ScopedJniEnvLocalRefState env_state(env); 726 const char* old_cause = self->StartAssertNoThreadSuspension("Quick method resolution set up"); 727 728 // Compute details about the called method (avoid GCs) 729 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 730 mirror::ArtMethod* caller = QuickArgumentVisitor::GetCallingMethod(sp); 731 InvokeType invoke_type; 732 MethodReference called_method(nullptr, 0); 733 const bool called_method_known_on_entry = !called->IsRuntimeMethod(); 734 if (!called_method_known_on_entry) { 735 uint32_t dex_pc = caller->ToDexPc(QuickArgumentVisitor::GetCallingPc(sp)); 736 const DexFile::CodeItem* code; 737 called_method.dex_file = caller->GetDexFile(); 738 code = caller->GetCodeItem(); 739 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 740 const Instruction* instr = Instruction::At(&code->insns_[dex_pc]); 741 Instruction::Code instr_code = instr->Opcode(); 742 bool is_range; 743 switch (instr_code) { 744 case Instruction::INVOKE_DIRECT: 745 invoke_type = kDirect; 746 is_range = false; 747 break; 748 case Instruction::INVOKE_DIRECT_RANGE: 749 invoke_type = kDirect; 750 is_range = true; 751 break; 752 case Instruction::INVOKE_STATIC: 753 invoke_type = kStatic; 754 is_range = false; 755 break; 756 case Instruction::INVOKE_STATIC_RANGE: 757 invoke_type = kStatic; 758 is_range = true; 759 break; 760 case Instruction::INVOKE_SUPER: 761 invoke_type = kSuper; 762 is_range = false; 763 break; 764 case Instruction::INVOKE_SUPER_RANGE: 765 invoke_type = kSuper; 766 is_range = true; 767 break; 768 case Instruction::INVOKE_VIRTUAL: 769 invoke_type = kVirtual; 770 is_range = false; 771 break; 772 case Instruction::INVOKE_VIRTUAL_RANGE: 773 invoke_type = kVirtual; 774 is_range = true; 775 break; 776 case Instruction::INVOKE_INTERFACE: 777 invoke_type = kInterface; 778 is_range = false; 779 break; 780 case Instruction::INVOKE_INTERFACE_RANGE: 781 invoke_type = kInterface; 782 is_range = true; 783 break; 784 default: 785 LOG(FATAL) << "Unexpected call into trampoline: " << instr->DumpString(nullptr); 786 UNREACHABLE(); 787 } 788 called_method.dex_method_index = (is_range) ? instr->VRegB_3rc() : instr->VRegB_35c(); 789 } else { 790 invoke_type = kStatic; 791 called_method.dex_file = called->GetDexFile(); 792 called_method.dex_method_index = called->GetDexMethodIndex(); 793 } 794 uint32_t shorty_len; 795 const char* shorty = 796 called_method.dex_file->GetMethodShorty( 797 called_method.dex_file->GetMethodId(called_method.dex_method_index), &shorty_len); 798 RememberForGcArgumentVisitor visitor(sp, invoke_type == kStatic, shorty, shorty_len, &soa); 799 visitor.VisitArguments(); 800 self->EndAssertNoThreadSuspension(old_cause); 801 const bool virtual_or_interface = invoke_type == kVirtual || invoke_type == kInterface; 802 // Resolve method filling in dex cache. 803 if (!called_method_known_on_entry) { 804 StackHandleScope<1> hs(self); 805 mirror::Object* dummy = nullptr; 806 HandleWrapper<mirror::Object> h_receiver( 807 hs.NewHandleWrapper(virtual_or_interface ? &receiver : &dummy)); 808 DCHECK_EQ(caller->GetDexFile(), called_method.dex_file); 809 called = linker->ResolveMethod(self, called_method.dex_method_index, &caller, invoke_type); 810 } 811 const void* code = nullptr; 812 if (LIKELY(!self->IsExceptionPending())) { 813 // Incompatible class change should have been handled in resolve method. 814 CHECK(!called->CheckIncompatibleClassChange(invoke_type)) 815 << PrettyMethod(called) << " " << invoke_type; 816 if (virtual_or_interface) { 817 // Refine called method based on receiver. 818 CHECK(receiver != nullptr) << invoke_type; 819 820 mirror::ArtMethod* orig_called = called; 821 if (invoke_type == kVirtual) { 822 called = receiver->GetClass()->FindVirtualMethodForVirtual(called); 823 } else { 824 called = receiver->GetClass()->FindVirtualMethodForInterface(called); 825 } 826 827 CHECK(called != nullptr) << PrettyMethod(orig_called) << " " 828 << PrettyTypeOf(receiver) << " " 829 << invoke_type << " " << orig_called->GetVtableIndex(); 830 831 // We came here because of sharpening. Ensure the dex cache is up-to-date on the method index 832 // of the sharpened method avoiding dirtying the dex cache if possible. 833 // Note, called_method.dex_method_index references the dex method before the 834 // FindVirtualMethodFor... This is ok for FindDexMethodIndexInOtherDexFile that only cares 835 // about the name and signature. 836 uint32_t update_dex_cache_method_index = called->GetDexMethodIndex(); 837 if (!called->HasSameDexCacheResolvedMethods(caller)) { 838 // Calling from one dex file to another, need to compute the method index appropriate to 839 // the caller's dex file. Since we get here only if the original called was a runtime 840 // method, we've got the correct dex_file and a dex_method_idx from above. 841 DCHECK(!called_method_known_on_entry); 842 DCHECK_EQ(caller->GetDexFile(), called_method.dex_file); 843 const DexFile* caller_dex_file = called_method.dex_file; 844 uint32_t caller_method_name_and_sig_index = called_method.dex_method_index; 845 update_dex_cache_method_index = 846 called->FindDexMethodIndexInOtherDexFile(*caller_dex_file, 847 caller_method_name_and_sig_index); 848 } 849 if ((update_dex_cache_method_index != DexFile::kDexNoIndex) && 850 (caller->GetDexCacheResolvedMethod(update_dex_cache_method_index) != called)) { 851 caller->SetDexCacheResolvedMethod(update_dex_cache_method_index, called); 852 } 853 } 854 // Ensure that the called method's class is initialized. 855 StackHandleScope<1> hs(soa.Self()); 856 Handle<mirror::Class> called_class(hs.NewHandle(called->GetDeclaringClass())); 857 linker->EnsureInitialized(soa.Self(), called_class, true, true); 858 if (LIKELY(called_class->IsInitialized())) { 859 code = called->GetEntryPointFromQuickCompiledCode(); 860 } else if (called_class->IsInitializing()) { 861 if (invoke_type == kStatic) { 862 // Class is still initializing, go to oat and grab code (trampoline must be left in place 863 // until class is initialized to stop races between threads). 864 code = linker->GetQuickOatCodeFor(called); 865 } else { 866 // No trampoline for non-static methods. 867 code = called->GetEntryPointFromQuickCompiledCode(); 868 } 869 } else { 870 DCHECK(called_class->IsErroneous()); 871 } 872 } 873 CHECK_EQ(code == nullptr, self->IsExceptionPending()); 874 // Fixup any locally saved objects may have moved during a GC. 875 visitor.FixupReferences(); 876 // Place called method in callee-save frame to be placed as first argument to quick method. 877 sp->Assign(called); 878 return code; 879} 880 881/* 882 * This class uses a couple of observations to unite the different calling conventions through 883 * a few constants. 884 * 885 * 1) Number of registers used for passing is normally even, so counting down has no penalty for 886 * possible alignment. 887 * 2) Known 64b architectures store 8B units on the stack, both for integral and floating point 888 * types, so using uintptr_t is OK. Also means that we can use kRegistersNeededX to denote 889 * when we have to split things 890 * 3) The only soft-float, Arm, is 32b, so no widening needs to be taken into account for floats 891 * and we can use Int handling directly. 892 * 4) Only 64b architectures widen, and their stack is aligned 8B anyways, so no padding code 893 * necessary when widening. Also, widening of Ints will take place implicitly, and the 894 * extension should be compatible with Aarch64, which mandates copying the available bits 895 * into LSB and leaving the rest unspecified. 896 * 5) Aligning longs and doubles is necessary on arm only, and it's the same in registers and on 897 * the stack. 898 * 6) There is only little endian. 899 * 900 * 901 * Actual work is supposed to be done in a delegate of the template type. The interface is as 902 * follows: 903 * 904 * void PushGpr(uintptr_t): Add a value for the next GPR 905 * 906 * void PushFpr4(float): Add a value for the next FPR of size 32b. Is only called if we need 907 * padding, that is, think the architecture is 32b and aligns 64b. 908 * 909 * void PushFpr8(uint64_t): Push a double. We _will_ call this on 32b, it's the callee's job to 910 * split this if necessary. The current state will have aligned, if 911 * necessary. 912 * 913 * void PushStack(uintptr_t): Push a value to the stack. 914 * 915 * uintptr_t PushHandleScope(mirror::Object* ref): Add a reference to the HandleScope. This _will_ have nullptr, 916 * as this might be important for null initialization. 917 * Must return the jobject, that is, the reference to the 918 * entry in the HandleScope (nullptr if necessary). 919 * 920 */ 921template<class T> class BuildNativeCallFrameStateMachine { 922 public: 923#if defined(__arm__) 924 // TODO: These are all dummy values! 925 static constexpr bool kNativeSoftFloatAbi = true; 926 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs, r0-r3 927 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 928 929 static constexpr size_t kRegistersNeededForLong = 2; 930 static constexpr size_t kRegistersNeededForDouble = 2; 931 static constexpr bool kMultiRegistersAligned = true; 932 static constexpr bool kMultiRegistersWidened = false; 933 static constexpr bool kAlignLongOnStack = true; 934 static constexpr bool kAlignDoubleOnStack = true; 935#elif defined(__aarch64__) 936 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 937 static constexpr size_t kNumNativeGprArgs = 8; // 6 arguments passed in GPRs. 938 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 939 940 static constexpr size_t kRegistersNeededForLong = 1; 941 static constexpr size_t kRegistersNeededForDouble = 1; 942 static constexpr bool kMultiRegistersAligned = false; 943 static constexpr bool kMultiRegistersWidened = false; 944 static constexpr bool kAlignLongOnStack = false; 945 static constexpr bool kAlignDoubleOnStack = false; 946#elif defined(__mips__) 947 static constexpr bool kNativeSoftFloatAbi = true; // This is a hard float ABI. 948 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs. 949 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 950 951 static constexpr size_t kRegistersNeededForLong = 2; 952 static constexpr size_t kRegistersNeededForDouble = 2; 953 static constexpr bool kMultiRegistersAligned = true; 954 static constexpr bool kMultiRegistersWidened = true; 955 static constexpr bool kAlignLongOnStack = true; 956 static constexpr bool kAlignDoubleOnStack = true; 957#elif defined(__i386__) 958 // TODO: Check these! 959 static constexpr bool kNativeSoftFloatAbi = false; // Not using int registers for fp 960 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 961 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 962 963 static constexpr size_t kRegistersNeededForLong = 2; 964 static constexpr size_t kRegistersNeededForDouble = 2; 965 static constexpr bool kMultiRegistersAligned = false; // x86 not using regs, anyways 966 static constexpr bool kMultiRegistersWidened = false; 967 static constexpr bool kAlignLongOnStack = false; 968 static constexpr bool kAlignDoubleOnStack = false; 969#elif defined(__x86_64__) 970 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 971 static constexpr size_t kNumNativeGprArgs = 6; // 6 arguments passed in GPRs. 972 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 973 974 static constexpr size_t kRegistersNeededForLong = 1; 975 static constexpr size_t kRegistersNeededForDouble = 1; 976 static constexpr bool kMultiRegistersAligned = false; 977 static constexpr bool kMultiRegistersWidened = false; 978 static constexpr bool kAlignLongOnStack = false; 979 static constexpr bool kAlignDoubleOnStack = false; 980#else 981#error "Unsupported architecture" 982#endif 983 984 public: 985 explicit BuildNativeCallFrameStateMachine(T* delegate) 986 : gpr_index_(kNumNativeGprArgs), 987 fpr_index_(kNumNativeFprArgs), 988 stack_entries_(0), 989 delegate_(delegate) { 990 // For register alignment, we want to assume that counters (gpr_index_, fpr_index_) are even iff 991 // the next register is even; counting down is just to make the compiler happy... 992 static_assert(kNumNativeGprArgs % 2 == 0U, "Number of native GPR arguments not even"); 993 static_assert(kNumNativeFprArgs % 2 == 0U, "Number of native FPR arguments not even"); 994 } 995 996 virtual ~BuildNativeCallFrameStateMachine() {} 997 998 bool HavePointerGpr() const { 999 return gpr_index_ > 0; 1000 } 1001 1002 void AdvancePointer(const void* val) { 1003 if (HavePointerGpr()) { 1004 gpr_index_--; 1005 PushGpr(reinterpret_cast<uintptr_t>(val)); 1006 } else { 1007 stack_entries_++; // TODO: have a field for pointer length as multiple of 32b 1008 PushStack(reinterpret_cast<uintptr_t>(val)); 1009 gpr_index_ = 0; 1010 } 1011 } 1012 1013 bool HaveHandleScopeGpr() const { 1014 return gpr_index_ > 0; 1015 } 1016 1017 void AdvanceHandleScope(mirror::Object* ptr) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1018 uintptr_t handle = PushHandle(ptr); 1019 if (HaveHandleScopeGpr()) { 1020 gpr_index_--; 1021 PushGpr(handle); 1022 } else { 1023 stack_entries_++; 1024 PushStack(handle); 1025 gpr_index_ = 0; 1026 } 1027 } 1028 1029 bool HaveIntGpr() const { 1030 return gpr_index_ > 0; 1031 } 1032 1033 void AdvanceInt(uint32_t val) { 1034 if (HaveIntGpr()) { 1035 gpr_index_--; 1036 PushGpr(val); 1037 } else { 1038 stack_entries_++; 1039 PushStack(val); 1040 gpr_index_ = 0; 1041 } 1042 } 1043 1044 bool HaveLongGpr() const { 1045 return gpr_index_ >= kRegistersNeededForLong + (LongGprNeedsPadding() ? 1 : 0); 1046 } 1047 1048 bool LongGprNeedsPadding() const { 1049 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1050 kAlignLongOnStack && // and when it needs alignment 1051 (gpr_index_ & 1) == 1; // counter is odd, see constructor 1052 } 1053 1054 bool LongStackNeedsPadding() const { 1055 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1056 kAlignLongOnStack && // and when it needs 8B alignment 1057 (stack_entries_ & 1) == 1; // counter is odd 1058 } 1059 1060 void AdvanceLong(uint64_t val) { 1061 if (HaveLongGpr()) { 1062 if (LongGprNeedsPadding()) { 1063 PushGpr(0); 1064 gpr_index_--; 1065 } 1066 if (kRegistersNeededForLong == 1) { 1067 PushGpr(static_cast<uintptr_t>(val)); 1068 } else { 1069 PushGpr(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1070 PushGpr(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1071 } 1072 gpr_index_ -= kRegistersNeededForLong; 1073 } else { 1074 if (LongStackNeedsPadding()) { 1075 PushStack(0); 1076 stack_entries_++; 1077 } 1078 if (kRegistersNeededForLong == 1) { 1079 PushStack(static_cast<uintptr_t>(val)); 1080 stack_entries_++; 1081 } else { 1082 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1083 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1084 stack_entries_ += 2; 1085 } 1086 gpr_index_ = 0; 1087 } 1088 } 1089 1090 bool HaveFloatFpr() const { 1091 return fpr_index_ > 0; 1092 } 1093 1094 void AdvanceFloat(float val) { 1095 if (kNativeSoftFloatAbi) { 1096 AdvanceInt(bit_cast<float, uint32_t>(val)); 1097 } else { 1098 if (HaveFloatFpr()) { 1099 fpr_index_--; 1100 if (kRegistersNeededForDouble == 1) { 1101 if (kMultiRegistersWidened) { 1102 PushFpr8(bit_cast<double, uint64_t>(val)); 1103 } else { 1104 // No widening, just use the bits. 1105 PushFpr8(bit_cast<float, uint64_t>(val)); 1106 } 1107 } else { 1108 PushFpr4(val); 1109 } 1110 } else { 1111 stack_entries_++; 1112 if (kRegistersNeededForDouble == 1 && kMultiRegistersWidened) { 1113 // Need to widen before storing: Note the "double" in the template instantiation. 1114 // Note: We need to jump through those hoops to make the compiler happy. 1115 DCHECK_EQ(sizeof(uintptr_t), sizeof(uint64_t)); 1116 PushStack(static_cast<uintptr_t>(bit_cast<double, uint64_t>(val))); 1117 } else { 1118 PushStack(bit_cast<float, uintptr_t>(val)); 1119 } 1120 fpr_index_ = 0; 1121 } 1122 } 1123 } 1124 1125 bool HaveDoubleFpr() const { 1126 return fpr_index_ >= kRegistersNeededForDouble + (DoubleFprNeedsPadding() ? 1 : 0); 1127 } 1128 1129 bool DoubleFprNeedsPadding() const { 1130 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1131 kAlignDoubleOnStack && // and when it needs alignment 1132 (fpr_index_ & 1) == 1; // counter is odd, see constructor 1133 } 1134 1135 bool DoubleStackNeedsPadding() const { 1136 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1137 kAlignDoubleOnStack && // and when it needs 8B alignment 1138 (stack_entries_ & 1) == 1; // counter is odd 1139 } 1140 1141 void AdvanceDouble(uint64_t val) { 1142 if (kNativeSoftFloatAbi) { 1143 AdvanceLong(val); 1144 } else { 1145 if (HaveDoubleFpr()) { 1146 if (DoubleFprNeedsPadding()) { 1147 PushFpr4(0); 1148 fpr_index_--; 1149 } 1150 PushFpr8(val); 1151 fpr_index_ -= kRegistersNeededForDouble; 1152 } else { 1153 if (DoubleStackNeedsPadding()) { 1154 PushStack(0); 1155 stack_entries_++; 1156 } 1157 if (kRegistersNeededForDouble == 1) { 1158 PushStack(static_cast<uintptr_t>(val)); 1159 stack_entries_++; 1160 } else { 1161 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1162 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1163 stack_entries_ += 2; 1164 } 1165 fpr_index_ = 0; 1166 } 1167 } 1168 } 1169 1170 uint32_t GetStackEntries() const { 1171 return stack_entries_; 1172 } 1173 1174 uint32_t GetNumberOfUsedGprs() const { 1175 return kNumNativeGprArgs - gpr_index_; 1176 } 1177 1178 uint32_t GetNumberOfUsedFprs() const { 1179 return kNumNativeFprArgs - fpr_index_; 1180 } 1181 1182 private: 1183 void PushGpr(uintptr_t val) { 1184 delegate_->PushGpr(val); 1185 } 1186 void PushFpr4(float val) { 1187 delegate_->PushFpr4(val); 1188 } 1189 void PushFpr8(uint64_t val) { 1190 delegate_->PushFpr8(val); 1191 } 1192 void PushStack(uintptr_t val) { 1193 delegate_->PushStack(val); 1194 } 1195 uintptr_t PushHandle(mirror::Object* ref) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1196 return delegate_->PushHandle(ref); 1197 } 1198 1199 uint32_t gpr_index_; // Number of free GPRs 1200 uint32_t fpr_index_; // Number of free FPRs 1201 uint32_t stack_entries_; // Stack entries are in multiples of 32b, as floats are usually not 1202 // extended 1203 T* const delegate_; // What Push implementation gets called 1204}; 1205 1206// Computes the sizes of register stacks and call stack area. Handling of references can be extended 1207// in subclasses. 1208// 1209// To handle native pointers, use "L" in the shorty for an object reference, which simulates 1210// them with handles. 1211class ComputeNativeCallFrameSize { 1212 public: 1213 ComputeNativeCallFrameSize() : num_stack_entries_(0) {} 1214 1215 virtual ~ComputeNativeCallFrameSize() {} 1216 1217 uint32_t GetStackSize() const { 1218 return num_stack_entries_ * sizeof(uintptr_t); 1219 } 1220 1221 uint8_t* LayoutCallStack(uint8_t* sp8) const { 1222 sp8 -= GetStackSize(); 1223 // Align by kStackAlignment. 1224 sp8 = reinterpret_cast<uint8_t*>(RoundDown(reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1225 return sp8; 1226 } 1227 1228 uint8_t* LayoutCallRegisterStacks(uint8_t* sp8, uintptr_t** start_gpr, uint32_t** start_fpr) 1229 const { 1230 // Assumption is OK right now, as we have soft-float arm 1231 size_t fregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeFprArgs; 1232 sp8 -= fregs * sizeof(uintptr_t); 1233 *start_fpr = reinterpret_cast<uint32_t*>(sp8); 1234 size_t iregs = BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>::kNumNativeGprArgs; 1235 sp8 -= iregs * sizeof(uintptr_t); 1236 *start_gpr = reinterpret_cast<uintptr_t*>(sp8); 1237 return sp8; 1238 } 1239 1240 uint8_t* LayoutNativeCall(uint8_t* sp8, uintptr_t** start_stack, uintptr_t** start_gpr, 1241 uint32_t** start_fpr) const { 1242 // Native call stack. 1243 sp8 = LayoutCallStack(sp8); 1244 *start_stack = reinterpret_cast<uintptr_t*>(sp8); 1245 1246 // Put fprs and gprs below. 1247 sp8 = LayoutCallRegisterStacks(sp8, start_gpr, start_fpr); 1248 1249 // Return the new bottom. 1250 return sp8; 1251 } 1252 1253 virtual void WalkHeader(BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) 1254 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1255 UNUSED(sm); 1256 } 1257 1258 void Walk(const char* shorty, uint32_t shorty_len) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1259 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize> sm(this); 1260 1261 WalkHeader(&sm); 1262 1263 for (uint32_t i = 1; i < shorty_len; ++i) { 1264 Primitive::Type cur_type_ = Primitive::GetType(shorty[i]); 1265 switch (cur_type_) { 1266 case Primitive::kPrimNot: 1267 // TODO: fix abuse of mirror types. 1268 sm.AdvanceHandleScope( 1269 reinterpret_cast<mirror::Object*>(0x12345678)); 1270 break; 1271 1272 case Primitive::kPrimBoolean: 1273 case Primitive::kPrimByte: 1274 case Primitive::kPrimChar: 1275 case Primitive::kPrimShort: 1276 case Primitive::kPrimInt: 1277 sm.AdvanceInt(0); 1278 break; 1279 case Primitive::kPrimFloat: 1280 sm.AdvanceFloat(0); 1281 break; 1282 case Primitive::kPrimDouble: 1283 sm.AdvanceDouble(0); 1284 break; 1285 case Primitive::kPrimLong: 1286 sm.AdvanceLong(0); 1287 break; 1288 default: 1289 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty; 1290 UNREACHABLE(); 1291 } 1292 } 1293 1294 num_stack_entries_ = sm.GetStackEntries(); 1295 } 1296 1297 void PushGpr(uintptr_t /* val */) { 1298 // not optimizing registers, yet 1299 } 1300 1301 void PushFpr4(float /* val */) { 1302 // not optimizing registers, yet 1303 } 1304 1305 void PushFpr8(uint64_t /* val */) { 1306 // not optimizing registers, yet 1307 } 1308 1309 void PushStack(uintptr_t /* val */) { 1310 // counting is already done in the superclass 1311 } 1312 1313 virtual uintptr_t PushHandle(mirror::Object* /* ptr */) { 1314 return reinterpret_cast<uintptr_t>(nullptr); 1315 } 1316 1317 protected: 1318 uint32_t num_stack_entries_; 1319}; 1320 1321class ComputeGenericJniFrameSize FINAL : public ComputeNativeCallFrameSize { 1322 public: 1323 ComputeGenericJniFrameSize() : num_handle_scope_references_(0) {} 1324 1325 // Lays out the callee-save frame. Assumes that the incorrect frame corresponding to RefsAndArgs 1326 // is at *m = sp. Will update to point to the bottom of the save frame. 1327 // 1328 // Note: assumes ComputeAll() has been run before. 1329 void LayoutCalleeSaveFrame(Thread* self, StackReference<mirror::ArtMethod>** m, void* sp, 1330 HandleScope** handle_scope) 1331 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1332 mirror::ArtMethod* method = (*m)->AsMirrorPtr(); 1333 1334 uint8_t* sp8 = reinterpret_cast<uint8_t*>(sp); 1335 1336 // First, fix up the layout of the callee-save frame. 1337 // We have to squeeze in the HandleScope, and relocate the method pointer. 1338 1339 // "Free" the slot for the method. 1340 sp8 += sizeof(void*); // In the callee-save frame we use a full pointer. 1341 1342 // Under the callee saves put handle scope and new method stack reference. 1343 size_t handle_scope_size = HandleScope::SizeOf(num_handle_scope_references_); 1344 size_t scope_and_method = handle_scope_size + sizeof(StackReference<mirror::ArtMethod>); 1345 1346 sp8 -= scope_and_method; 1347 // Align by kStackAlignment. 1348 sp8 = reinterpret_cast<uint8_t*>(RoundDown( 1349 reinterpret_cast<uintptr_t>(sp8), kStackAlignment)); 1350 1351 uint8_t* sp8_table = sp8 + sizeof(StackReference<mirror::ArtMethod>); 1352 *handle_scope = HandleScope::Create(sp8_table, self->GetTopHandleScope(), 1353 num_handle_scope_references_); 1354 1355 // Add a slot for the method pointer, and fill it. Fix the pointer-pointer given to us. 1356 uint8_t* method_pointer = sp8; 1357 StackReference<mirror::ArtMethod>* new_method_ref = 1358 reinterpret_cast<StackReference<mirror::ArtMethod>*>(method_pointer); 1359 new_method_ref->Assign(method); 1360 *m = new_method_ref; 1361 } 1362 1363 // Adds space for the cookie. Note: may leave stack unaligned. 1364 void LayoutCookie(uint8_t** sp) const { 1365 // Reference cookie and padding 1366 *sp -= 8; 1367 } 1368 1369 // Re-layout the callee-save frame (insert a handle-scope). Then add space for the cookie. 1370 // Returns the new bottom. Note: this may be unaligned. 1371 uint8_t* LayoutJNISaveFrame(Thread* self, StackReference<mirror::ArtMethod>** m, void* sp, 1372 HandleScope** handle_scope) 1373 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1374 // First, fix up the layout of the callee-save frame. 1375 // We have to squeeze in the HandleScope, and relocate the method pointer. 1376 LayoutCalleeSaveFrame(self, m, sp, handle_scope); 1377 1378 // The bottom of the callee-save frame is now where the method is, *m. 1379 uint8_t* sp8 = reinterpret_cast<uint8_t*>(*m); 1380 1381 // Add space for cookie. 1382 LayoutCookie(&sp8); 1383 1384 return sp8; 1385 } 1386 1387 // WARNING: After this, *sp won't be pointing to the method anymore! 1388 uint8_t* ComputeLayout(Thread* self, StackReference<mirror::ArtMethod>** m, 1389 const char* shorty, uint32_t shorty_len, HandleScope** handle_scope, 1390 uintptr_t** start_stack, uintptr_t** start_gpr, uint32_t** start_fpr) 1391 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1392 Walk(shorty, shorty_len); 1393 1394 // JNI part. 1395 uint8_t* sp8 = LayoutJNISaveFrame(self, m, reinterpret_cast<void*>(*m), handle_scope); 1396 1397 sp8 = LayoutNativeCall(sp8, start_stack, start_gpr, start_fpr); 1398 1399 // Return the new bottom. 1400 return sp8; 1401 } 1402 1403 uintptr_t PushHandle(mirror::Object* /* ptr */) OVERRIDE; 1404 1405 // Add JNIEnv* and jobj/jclass before the shorty-derived elements. 1406 void WalkHeader(BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) OVERRIDE 1407 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1408 1409 private: 1410 uint32_t num_handle_scope_references_; 1411}; 1412 1413uintptr_t ComputeGenericJniFrameSize::PushHandle(mirror::Object* /* ptr */) { 1414 num_handle_scope_references_++; 1415 return reinterpret_cast<uintptr_t>(nullptr); 1416} 1417 1418void ComputeGenericJniFrameSize::WalkHeader( 1419 BuildNativeCallFrameStateMachine<ComputeNativeCallFrameSize>* sm) { 1420 // JNIEnv 1421 sm->AdvancePointer(nullptr); 1422 1423 // Class object or this as first argument 1424 sm->AdvanceHandleScope(reinterpret_cast<mirror::Object*>(0x12345678)); 1425} 1426 1427// Class to push values to three separate regions. Used to fill the native call part. Adheres to 1428// the template requirements of BuildGenericJniFrameStateMachine. 1429class FillNativeCall { 1430 public: 1431 FillNativeCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) : 1432 cur_gpr_reg_(gpr_regs), cur_fpr_reg_(fpr_regs), cur_stack_arg_(stack_args) {} 1433 1434 virtual ~FillNativeCall() {} 1435 1436 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args) { 1437 cur_gpr_reg_ = gpr_regs; 1438 cur_fpr_reg_ = fpr_regs; 1439 cur_stack_arg_ = stack_args; 1440 } 1441 1442 void PushGpr(uintptr_t val) { 1443 *cur_gpr_reg_ = val; 1444 cur_gpr_reg_++; 1445 } 1446 1447 void PushFpr4(float val) { 1448 *cur_fpr_reg_ = val; 1449 cur_fpr_reg_++; 1450 } 1451 1452 void PushFpr8(uint64_t val) { 1453 uint64_t* tmp = reinterpret_cast<uint64_t*>(cur_fpr_reg_); 1454 *tmp = val; 1455 cur_fpr_reg_ += 2; 1456 } 1457 1458 void PushStack(uintptr_t val) { 1459 *cur_stack_arg_ = val; 1460 cur_stack_arg_++; 1461 } 1462 1463 virtual uintptr_t PushHandle(mirror::Object*) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1464 LOG(FATAL) << "(Non-JNI) Native call does not use handles."; 1465 UNREACHABLE(); 1466 } 1467 1468 private: 1469 uintptr_t* cur_gpr_reg_; 1470 uint32_t* cur_fpr_reg_; 1471 uintptr_t* cur_stack_arg_; 1472}; 1473 1474// Visits arguments on the stack placing them into a region lower down the stack for the benefit 1475// of transitioning into native code. 1476class BuildGenericJniFrameVisitor FINAL : public QuickArgumentVisitor { 1477 public: 1478 BuildGenericJniFrameVisitor(Thread* self, bool is_static, const char* shorty, uint32_t shorty_len, 1479 StackReference<mirror::ArtMethod>** sp) 1480 : QuickArgumentVisitor(*sp, is_static, shorty, shorty_len), 1481 jni_call_(nullptr, nullptr, nullptr, nullptr), sm_(&jni_call_) { 1482 ComputeGenericJniFrameSize fsc; 1483 uintptr_t* start_gpr_reg; 1484 uint32_t* start_fpr_reg; 1485 uintptr_t* start_stack_arg; 1486 bottom_of_used_area_ = fsc.ComputeLayout(self, sp, shorty, shorty_len, 1487 &handle_scope_, 1488 &start_stack_arg, 1489 &start_gpr_reg, &start_fpr_reg); 1490 1491 jni_call_.Reset(start_gpr_reg, start_fpr_reg, start_stack_arg, handle_scope_); 1492 1493 // jni environment is always first argument 1494 sm_.AdvancePointer(self->GetJniEnv()); 1495 1496 if (is_static) { 1497 sm_.AdvanceHandleScope((*sp)->AsMirrorPtr()->GetDeclaringClass()); 1498 } 1499 } 1500 1501 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 1502 1503 void FinalizeHandleScope(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1504 1505 StackReference<mirror::Object>* GetFirstHandleScopeEntry() 1506 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1507 return handle_scope_->GetHandle(0).GetReference(); 1508 } 1509 1510 jobject GetFirstHandleScopeJObject() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1511 return handle_scope_->GetHandle(0).ToJObject(); 1512 } 1513 1514 void* GetBottomOfUsedArea() const { 1515 return bottom_of_used_area_; 1516 } 1517 1518 private: 1519 // A class to fill a JNI call. Adds reference/handle-scope management to FillNativeCall. 1520 class FillJniCall FINAL : public FillNativeCall { 1521 public: 1522 FillJniCall(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, 1523 HandleScope* handle_scope) : FillNativeCall(gpr_regs, fpr_regs, stack_args), 1524 handle_scope_(handle_scope), cur_entry_(0) {} 1525 1526 uintptr_t PushHandle(mirror::Object* ref) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1527 1528 void Reset(uintptr_t* gpr_regs, uint32_t* fpr_regs, uintptr_t* stack_args, HandleScope* scope) { 1529 FillNativeCall::Reset(gpr_regs, fpr_regs, stack_args); 1530 handle_scope_ = scope; 1531 cur_entry_ = 0U; 1532 } 1533 1534 void ResetRemainingScopeSlots() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1535 // Initialize padding entries. 1536 size_t expected_slots = handle_scope_->NumberOfReferences(); 1537 while (cur_entry_ < expected_slots) { 1538 handle_scope_->GetMutableHandle(cur_entry_++).Assign(nullptr); 1539 } 1540 DCHECK_NE(cur_entry_, 0U); 1541 } 1542 1543 private: 1544 HandleScope* handle_scope_; 1545 size_t cur_entry_; 1546 }; 1547 1548 HandleScope* handle_scope_; 1549 FillJniCall jni_call_; 1550 void* bottom_of_used_area_; 1551 1552 BuildNativeCallFrameStateMachine<FillJniCall> sm_; 1553 1554 DISALLOW_COPY_AND_ASSIGN(BuildGenericJniFrameVisitor); 1555}; 1556 1557uintptr_t BuildGenericJniFrameVisitor::FillJniCall::PushHandle(mirror::Object* ref) { 1558 uintptr_t tmp; 1559 MutableHandle<mirror::Object> h = handle_scope_->GetMutableHandle(cur_entry_); 1560 h.Assign(ref); 1561 tmp = reinterpret_cast<uintptr_t>(h.ToJObject()); 1562 cur_entry_++; 1563 return tmp; 1564} 1565 1566void BuildGenericJniFrameVisitor::Visit() { 1567 Primitive::Type type = GetParamPrimitiveType(); 1568 switch (type) { 1569 case Primitive::kPrimLong: { 1570 jlong long_arg; 1571 if (IsSplitLongOrDouble()) { 1572 long_arg = ReadSplitLongParam(); 1573 } else { 1574 long_arg = *reinterpret_cast<jlong*>(GetParamAddress()); 1575 } 1576 sm_.AdvanceLong(long_arg); 1577 break; 1578 } 1579 case Primitive::kPrimDouble: { 1580 uint64_t double_arg; 1581 if (IsSplitLongOrDouble()) { 1582 // Read into union so that we don't case to a double. 1583 double_arg = ReadSplitLongParam(); 1584 } else { 1585 double_arg = *reinterpret_cast<uint64_t*>(GetParamAddress()); 1586 } 1587 sm_.AdvanceDouble(double_arg); 1588 break; 1589 } 1590 case Primitive::kPrimNot: { 1591 StackReference<mirror::Object>* stack_ref = 1592 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 1593 sm_.AdvanceHandleScope(stack_ref->AsMirrorPtr()); 1594 break; 1595 } 1596 case Primitive::kPrimFloat: 1597 sm_.AdvanceFloat(*reinterpret_cast<float*>(GetParamAddress())); 1598 break; 1599 case Primitive::kPrimBoolean: // Fall-through. 1600 case Primitive::kPrimByte: // Fall-through. 1601 case Primitive::kPrimChar: // Fall-through. 1602 case Primitive::kPrimShort: // Fall-through. 1603 case Primitive::kPrimInt: // Fall-through. 1604 sm_.AdvanceInt(*reinterpret_cast<jint*>(GetParamAddress())); 1605 break; 1606 case Primitive::kPrimVoid: 1607 LOG(FATAL) << "UNREACHABLE"; 1608 UNREACHABLE(); 1609 } 1610} 1611 1612void BuildGenericJniFrameVisitor::FinalizeHandleScope(Thread* self) { 1613 // Clear out rest of the scope. 1614 jni_call_.ResetRemainingScopeSlots(); 1615 // Install HandleScope. 1616 self->PushHandleScope(handle_scope_); 1617} 1618 1619#if defined(__arm__) || defined(__aarch64__) 1620extern "C" void* artFindNativeMethod(); 1621#else 1622extern "C" void* artFindNativeMethod(Thread* self); 1623#endif 1624 1625uint64_t artQuickGenericJniEndJNIRef(Thread* self, uint32_t cookie, jobject l, jobject lock) { 1626 if (lock != nullptr) { 1627 return reinterpret_cast<uint64_t>(JniMethodEndWithReferenceSynchronized(l, cookie, lock, self)); 1628 } else { 1629 return reinterpret_cast<uint64_t>(JniMethodEndWithReference(l, cookie, self)); 1630 } 1631} 1632 1633void artQuickGenericJniEndJNINonRef(Thread* self, uint32_t cookie, jobject lock) { 1634 if (lock != nullptr) { 1635 JniMethodEndSynchronized(cookie, lock, self); 1636 } else { 1637 JniMethodEnd(cookie, self); 1638 } 1639} 1640 1641/* 1642 * Initializes an alloca region assumed to be directly below sp for a native call: 1643 * Create a HandleScope and call stack and fill a mini stack with values to be pushed to registers. 1644 * The final element on the stack is a pointer to the native code. 1645 * 1646 * On entry, the stack has a standard callee-save frame above sp, and an alloca below it. 1647 * We need to fix this, as the handle scope needs to go into the callee-save frame. 1648 * 1649 * The return of this function denotes: 1650 * 1) How many bytes of the alloca can be released, if the value is non-negative. 1651 * 2) An error, if the value is negative. 1652 */ 1653extern "C" TwoWordReturn artQuickGenericJniTrampoline(Thread* self, 1654 StackReference<mirror::ArtMethod>* sp) 1655 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1656 mirror::ArtMethod* called = sp->AsMirrorPtr(); 1657 DCHECK(called->IsNative()) << PrettyMethod(called, true); 1658 uint32_t shorty_len = 0; 1659 const char* shorty = called->GetShorty(&shorty_len); 1660 1661 // Run the visitor and update sp. 1662 BuildGenericJniFrameVisitor visitor(self, called->IsStatic(), shorty, shorty_len, &sp); 1663 visitor.VisitArguments(); 1664 visitor.FinalizeHandleScope(self); 1665 1666 // Fix up managed-stack things in Thread. 1667 self->SetTopOfStack(sp); 1668 1669 self->VerifyStack(); 1670 1671 // Start JNI, save the cookie. 1672 uint32_t cookie; 1673 if (called->IsSynchronized()) { 1674 cookie = JniMethodStartSynchronized(visitor.GetFirstHandleScopeJObject(), self); 1675 if (self->IsExceptionPending()) { 1676 self->PopHandleScope(); 1677 // A negative value denotes an error. 1678 return GetTwoWordFailureValue(); 1679 } 1680 } else { 1681 cookie = JniMethodStart(self); 1682 } 1683 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 1684 *(sp32 - 1) = cookie; 1685 1686 // Retrieve the stored native code. 1687 void* nativeCode = called->GetEntryPointFromJni(); 1688 1689 // There are two cases for the content of nativeCode: 1690 // 1) Pointer to the native function. 1691 // 2) Pointer to the trampoline for native code binding. 1692 // In the second case, we need to execute the binding and continue with the actual native function 1693 // pointer. 1694 DCHECK(nativeCode != nullptr); 1695 if (nativeCode == GetJniDlsymLookupStub()) { 1696#if defined(__arm__) || defined(__aarch64__) 1697 nativeCode = artFindNativeMethod(); 1698#else 1699 nativeCode = artFindNativeMethod(self); 1700#endif 1701 1702 if (nativeCode == nullptr) { 1703 DCHECK(self->IsExceptionPending()); // There should be an exception pending now. 1704 1705 // End JNI, as the assembly will move to deliver the exception. 1706 jobject lock = called->IsSynchronized() ? visitor.GetFirstHandleScopeJObject() : nullptr; 1707 if (shorty[0] == 'L') { 1708 artQuickGenericJniEndJNIRef(self, cookie, nullptr, lock); 1709 } else { 1710 artQuickGenericJniEndJNINonRef(self, cookie, lock); 1711 } 1712 1713 return GetTwoWordFailureValue(); 1714 } 1715 // Note that the native code pointer will be automatically set by artFindNativeMethod(). 1716 } 1717 1718 // Return native code addr(lo) and bottom of alloca address(hi). 1719 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(visitor.GetBottomOfUsedArea()), 1720 reinterpret_cast<uintptr_t>(nativeCode)); 1721} 1722 1723/* 1724 * Is called after the native JNI code. Responsible for cleanup (handle scope, saved state) and 1725 * unlocking. 1726 */ 1727extern "C" uint64_t artQuickGenericJniEndTrampoline(Thread* self, jvalue result, uint64_t result_f) 1728 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1729 StackReference<mirror::ArtMethod>* sp = self->GetManagedStack()->GetTopQuickFrame(); 1730 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 1731 mirror::ArtMethod* called = sp->AsMirrorPtr(); 1732 uint32_t cookie = *(sp32 - 1); 1733 1734 jobject lock = nullptr; 1735 if (called->IsSynchronized()) { 1736 HandleScope* table = reinterpret_cast<HandleScope*>(reinterpret_cast<uint8_t*>(sp) 1737 + sizeof(StackReference<mirror::ArtMethod>)); 1738 lock = table->GetHandle(0).ToJObject(); 1739 } 1740 1741 char return_shorty_char = called->GetShorty()[0]; 1742 1743 if (return_shorty_char == 'L') { 1744 return artQuickGenericJniEndJNIRef(self, cookie, result.l, lock); 1745 } else { 1746 artQuickGenericJniEndJNINonRef(self, cookie, lock); 1747 1748 switch (return_shorty_char) { 1749 case 'F': { 1750 if (kRuntimeISA == kX86) { 1751 // Convert back the result to float. 1752 double d = bit_cast<uint64_t, double>(result_f); 1753 return bit_cast<float, uint32_t>(static_cast<float>(d)); 1754 } else { 1755 return result_f; 1756 } 1757 } 1758 case 'D': 1759 return result_f; 1760 case 'Z': 1761 return result.z; 1762 case 'B': 1763 return result.b; 1764 case 'C': 1765 return result.c; 1766 case 'S': 1767 return result.s; 1768 case 'I': 1769 return result.i; 1770 case 'J': 1771 return result.j; 1772 case 'V': 1773 return 0; 1774 default: 1775 LOG(FATAL) << "Unexpected return shorty character " << return_shorty_char; 1776 return 0; 1777 } 1778 } 1779} 1780 1781// We use TwoWordReturn to optimize scalar returns. We use the hi value for code, and the lo value 1782// for the method pointer. 1783// 1784// It is valid to use this, as at the usage points here (returns from C functions) we are assuming 1785// to hold the mutator lock (see SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) annotations). 1786 1787template<InvokeType type, bool access_check> 1788static TwoWordReturn artInvokeCommon(uint32_t method_idx, mirror::Object* this_object, 1789 mirror::ArtMethod* caller_method, 1790 Thread* self, StackReference<mirror::ArtMethod>* sp); 1791 1792template<InvokeType type, bool access_check> 1793static TwoWordReturn artInvokeCommon(uint32_t method_idx, mirror::Object* this_object, 1794 mirror::ArtMethod* caller_method, 1795 Thread* self, StackReference<mirror::ArtMethod>* sp) { 1796 ScopedQuickEntrypointChecks sqec(self); 1797 DCHECK_EQ(sp->AsMirrorPtr(), Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs)); 1798 mirror::ArtMethod* method = FindMethodFast(method_idx, this_object, caller_method, access_check, 1799 type); 1800 if (UNLIKELY(method == nullptr)) { 1801 const DexFile* dex_file = caller_method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1802 uint32_t shorty_len; 1803 const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(method_idx), &shorty_len); 1804 { 1805 // Remember the args in case a GC happens in FindMethodFromCode. 1806 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1807 RememberForGcArgumentVisitor visitor(sp, type == kStatic, shorty, shorty_len, &soa); 1808 visitor.VisitArguments(); 1809 method = FindMethodFromCode<type, access_check>(method_idx, &this_object, &caller_method, 1810 self); 1811 visitor.FixupReferences(); 1812 } 1813 1814 if (UNLIKELY(method == nullptr)) { 1815 CHECK(self->IsExceptionPending()); 1816 return GetTwoWordFailureValue(); // Failure. 1817 } 1818 } 1819 DCHECK(!self->IsExceptionPending()); 1820 const void* code = method->GetEntryPointFromQuickCompiledCode(); 1821 1822 // When we return, the caller will branch to this address, so it had better not be 0! 1823 DCHECK(code != nullptr) << "Code was null in method: " << PrettyMethod(method) 1824 << " location: " 1825 << method->GetDexFile()->GetLocation(); 1826 1827 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 1828 reinterpret_cast<uintptr_t>(method)); 1829} 1830 1831// Explicit artInvokeCommon template function declarations to please analysis tool. 1832#define EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(type, access_check) \ 1833 template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) \ 1834 TwoWordReturn artInvokeCommon<type, access_check>(uint32_t method_idx, \ 1835 mirror::Object* this_object, \ 1836 mirror::ArtMethod* caller_method, \ 1837 Thread* self, \ 1838 StackReference<mirror::ArtMethod>* sp) \ 1839 1840EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, false); 1841EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kVirtual, true); 1842EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, false); 1843EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kInterface, true); 1844EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, false); 1845EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kDirect, true); 1846EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, false); 1847EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kStatic, true); 1848EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, false); 1849EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL(kSuper, true); 1850#undef EXPLICIT_INVOKE_COMMON_TEMPLATE_DECL 1851 1852// See comments in runtime_support_asm.S 1853extern "C" TwoWordReturn artInvokeInterfaceTrampolineWithAccessCheck( 1854 uint32_t method_idx, mirror::Object* this_object, 1855 mirror::ArtMethod* caller_method, Thread* self, 1856 StackReference<mirror::ArtMethod>* sp) 1857 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1858 return artInvokeCommon<kInterface, true>(method_idx, this_object, 1859 caller_method, self, sp); 1860} 1861 1862extern "C" TwoWordReturn artInvokeDirectTrampolineWithAccessCheck( 1863 uint32_t method_idx, mirror::Object* this_object, 1864 mirror::ArtMethod* caller_method, Thread* self, 1865 StackReference<mirror::ArtMethod>* sp) 1866 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1867 return artInvokeCommon<kDirect, true>(method_idx, this_object, caller_method, 1868 self, sp); 1869} 1870 1871extern "C" TwoWordReturn artInvokeStaticTrampolineWithAccessCheck( 1872 uint32_t method_idx, mirror::Object* this_object, 1873 mirror::ArtMethod* caller_method, Thread* self, 1874 StackReference<mirror::ArtMethod>* sp) 1875 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1876 return artInvokeCommon<kStatic, true>(method_idx, this_object, caller_method, 1877 self, sp); 1878} 1879 1880extern "C" TwoWordReturn artInvokeSuperTrampolineWithAccessCheck( 1881 uint32_t method_idx, mirror::Object* this_object, 1882 mirror::ArtMethod* caller_method, Thread* self, 1883 StackReference<mirror::ArtMethod>* sp) 1884 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1885 return artInvokeCommon<kSuper, true>(method_idx, this_object, caller_method, 1886 self, sp); 1887} 1888 1889extern "C" TwoWordReturn artInvokeVirtualTrampolineWithAccessCheck( 1890 uint32_t method_idx, mirror::Object* this_object, 1891 mirror::ArtMethod* caller_method, Thread* self, 1892 StackReference<mirror::ArtMethod>* sp) 1893 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1894 return artInvokeCommon<kVirtual, true>(method_idx, this_object, caller_method, 1895 self, sp); 1896} 1897 1898// Determine target of interface dispatch. This object is known non-null. 1899extern "C" TwoWordReturn artInvokeInterfaceTrampoline(mirror::ArtMethod* interface_method, 1900 mirror::Object* this_object, 1901 mirror::ArtMethod* caller_method, 1902 Thread* self, 1903 StackReference<mirror::ArtMethod>* sp) 1904 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1905 ScopedQuickEntrypointChecks sqec(self); 1906 mirror::ArtMethod* method; 1907 if (LIKELY(interface_method->GetDexMethodIndex() != DexFile::kDexNoIndex)) { 1908 method = this_object->GetClass()->FindVirtualMethodForInterface(interface_method); 1909 if (UNLIKELY(method == nullptr)) { 1910 ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(interface_method, this_object, 1911 caller_method); 1912 return GetTwoWordFailureValue(); // Failure. 1913 } 1914 } else { 1915 DCHECK(interface_method == Runtime::Current()->GetResolutionMethod()); 1916 1917 // Find the caller PC. 1918 constexpr size_t pc_offset = GetCalleeSaveReturnPcOffset(kRuntimeISA, Runtime::kRefsAndArgs); 1919 uintptr_t caller_pc = *reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(sp) + pc_offset); 1920 1921 // Map the caller PC to a dex PC. 1922 uint32_t dex_pc = caller_method->ToDexPc(caller_pc); 1923 const DexFile::CodeItem* code = caller_method->GetCodeItem(); 1924 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 1925 const Instruction* instr = Instruction::At(&code->insns_[dex_pc]); 1926 Instruction::Code instr_code = instr->Opcode(); 1927 CHECK(instr_code == Instruction::INVOKE_INTERFACE || 1928 instr_code == Instruction::INVOKE_INTERFACE_RANGE) 1929 << "Unexpected call into interface trampoline: " << instr->DumpString(nullptr); 1930 uint32_t dex_method_idx; 1931 if (instr_code == Instruction::INVOKE_INTERFACE) { 1932 dex_method_idx = instr->VRegB_35c(); 1933 } else { 1934 DCHECK_EQ(instr_code, Instruction::INVOKE_INTERFACE_RANGE); 1935 dex_method_idx = instr->VRegB_3rc(); 1936 } 1937 1938 const DexFile* dex_file = caller_method->GetDeclaringClass()->GetDexCache() 1939 ->GetDexFile(); 1940 uint32_t shorty_len; 1941 const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(dex_method_idx), 1942 &shorty_len); 1943 { 1944 // Remember the args in case a GC happens in FindMethodFromCode. 1945 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1946 RememberForGcArgumentVisitor visitor(sp, false, shorty, shorty_len, &soa); 1947 visitor.VisitArguments(); 1948 method = FindMethodFromCode<kInterface, false>(dex_method_idx, &this_object, &caller_method, 1949 self); 1950 visitor.FixupReferences(); 1951 } 1952 1953 if (UNLIKELY(method == nullptr)) { 1954 CHECK(self->IsExceptionPending()); 1955 return GetTwoWordFailureValue(); // Failure. 1956 } 1957 } 1958 const void* code = method->GetEntryPointFromQuickCompiledCode(); 1959 1960 // When we return, the caller will branch to this address, so it had better not be 0! 1961 DCHECK(code != nullptr) << "Code was null in method: " << PrettyMethod(method) 1962 << " location: " << method->GetDexFile()->GetLocation(); 1963 1964 return GetTwoWordSuccessValue(reinterpret_cast<uintptr_t>(code), 1965 reinterpret_cast<uintptr_t>(method)); 1966} 1967 1968} // namespace art 1969