quick_trampoline_entrypoints.cc revision 9a6a99aaac2e4c973e0bc71075f196b8b084100f
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.h" 22#include "gc/accounting/card_table-inl.h" 23#include "interpreter/interpreter.h" 24#include "invoke_arg_array_builder.h" 25#include "mirror/art_method-inl.h" 26#include "mirror/class-inl.h" 27#include "mirror/object-inl.h" 28#include "mirror/object_array-inl.h" 29#include "object_utils.h" 30#include "runtime.h" 31 32namespace art { 33 34// Visits the arguments as saved to the stack by a Runtime::kRefAndArgs callee save frame. 35class QuickArgumentVisitor { 36 // Size of each spilled GPR. 37#ifdef __LP64__ 38 static constexpr size_t kBytesPerGprSpillLocation = 8; 39#else 40 static constexpr size_t kBytesPerGprSpillLocation = 4; 41#endif 42 // Number of bytes for each out register in the caller method's frame. 43 static constexpr size_t kBytesStackArgLocation = 4; 44#if defined(__arm__) 45 // The callee save frame is pointed to by SP. 46 // | argN | | 47 // | ... | | 48 // | arg4 | | 49 // | arg3 spill | | Caller's frame 50 // | arg2 spill | | 51 // | arg1 spill | | 52 // | Method* | --- 53 // | LR | 54 // | ... | callee saves 55 // | R3 | arg3 56 // | R2 | arg2 57 // | R1 | arg1 58 // | R0 | padding 59 // | Method* | <- sp 60 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 61 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 62 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 63 static constexpr size_t kBytesPerFprSpillLocation = 4; // FPR spill size is 4 bytes. 64 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0; // Offset of first FPR arg. 65 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 8; // Offset of first GPR arg. 66 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 44; // Offset of return address. 67 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 48; // Frame size. 68 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 69 return gpr_index * kBytesPerGprSpillLocation; 70 } 71#elif defined(__mips__) 72 // The callee save frame is pointed to by SP. 73 // | argN | | 74 // | ... | | 75 // | arg4 | | 76 // | arg3 spill | | Caller's frame 77 // | arg2 spill | | 78 // | arg1 spill | | 79 // | Method* | --- 80 // | RA | 81 // | ... | callee saves 82 // | A3 | arg3 83 // | A2 | arg2 84 // | A1 | arg1 85 // | A0/Method* | <- sp 86 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 87 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 88 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 89 static constexpr size_t kBytesPerFprSpillLocation = 4; // FPR spill size is 4 bytes. 90 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0; // Offset of first FPR arg. 91 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4; // Offset of first GPR arg. 92 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 60; // Offset of return address. 93 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 64; // Frame size. 94 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 95 return gpr_index * kBytesPerGprSpillLocation; 96 } 97#elif defined(__i386__) 98 // The callee save frame is pointed to by SP. 99 // | argN | | 100 // | ... | | 101 // | arg4 | | 102 // | arg3 spill | | Caller's frame 103 // | arg2 spill | | 104 // | arg1 spill | | 105 // | Method* | --- 106 // | Return | 107 // | EBP,ESI,EDI | callee saves 108 // | EBX | arg3 109 // | EDX | arg2 110 // | ECX | arg1 111 // | EAX/Method* | <- sp 112 static constexpr bool kQuickSoftFloatAbi = true; // This is a soft float ABI. 113 static constexpr size_t kNumQuickGprArgs = 3; // 3 arguments passed in GPRs. 114 static constexpr size_t kNumQuickFprArgs = 0; // 0 arguments passed in FPRs. 115 static constexpr size_t kBytesPerFprSpillLocation = 8; // FPR spill size is 8 bytes. 116 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 0; // Offset of first FPR arg. 117 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 4; // Offset of first GPR arg. 118 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 28; // Offset of return address. 119 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 32; // Frame size. 120 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 121 return gpr_index * kBytesPerGprSpillLocation; 122 } 123#elif defined(__x86_64__) 124 // The callee save frame is pointed to by SP. 125 // | argN | | 126 // | ... | | 127 // | reg. arg spills | | Caller's frame 128 // | Method* | --- 129 // | Return | 130 // | R15 | callee save 131 // | R14 | callee save 132 // | R13 | callee save 133 // | R12 | callee save 134 // | R9 | arg5 135 // | R8 | arg4 136 // | RSI/R6 | arg1 137 // | RBP/R5 | callee save 138 // | RBX/R3 | callee save 139 // | RDX/R2 | arg2 140 // | RCX/R1 | arg3 141 // | XMM7 | float arg 8 142 // | XMM6 | float arg 7 143 // | XMM5 | float arg 6 144 // | XMM4 | float arg 5 145 // | XMM3 | float arg 4 146 // | XMM2 | float arg 3 147 // | XMM1 | float arg 2 148 // | XMM0 | float arg 1 149 // | Padding | 150 // | RDI/Method* | <- sp 151 static constexpr bool kQuickSoftFloatAbi = false; // This is a hard float ABI. 152 static constexpr size_t kNumQuickGprArgs = 5; // 3 arguments passed in GPRs. 153 static constexpr size_t kNumQuickFprArgs = 8; // 0 arguments passed in FPRs. 154 static constexpr size_t kBytesPerFprSpillLocation = 8; // FPR spill size is 8 bytes. 155 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset = 16; // Offset of first FPR arg. 156 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset = 80; // Offset of first GPR arg. 157 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_LrOffset = 168; // Offset of return address. 158 static constexpr size_t kQuickCalleeSaveFrame_RefAndArgs_FrameSize = 176; // Frame size. 159 static size_t GprIndexToGprOffset(uint32_t gpr_index) { 160 switch (gpr_index) { 161 case 0: return (4 * kBytesPerGprSpillLocation); 162 case 1: return (1 * kBytesPerGprSpillLocation); 163 case 2: return (0 * kBytesPerGprSpillLocation); 164 case 3: return (5 * kBytesPerGprSpillLocation); 165 case 4: return (6 * kBytesPerGprSpillLocation); 166 default: 167 LOG(FATAL) << "Unexpected GPR index: " << gpr_index; 168 return 0; 169 } 170 } 171#else 172#error "Unsupported architecture" 173#endif 174 175 public: 176 static mirror::ArtMethod* GetCallingMethod(mirror::ArtMethod** sp) 177 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 178 DCHECK((*sp)->IsCalleeSaveMethod()); 179 byte* previous_sp = reinterpret_cast<byte*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize; 180 return *reinterpret_cast<mirror::ArtMethod**>(previous_sp); 181 } 182 183 // For the given quick ref and args quick frame, return the caller's PC. 184 static uintptr_t GetCallingPc(mirror::ArtMethod** sp) 185 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 186 DCHECK((*sp)->IsCalleeSaveMethod()); 187 byte* lr = reinterpret_cast<byte*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_LrOffset; 188 return *reinterpret_cast<uintptr_t*>(lr); 189 } 190 191 QuickArgumentVisitor(mirror::ArtMethod** sp, bool is_static, 192 const char* shorty, uint32_t shorty_len) 193 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 194 is_static_(is_static), shorty_(shorty), shorty_len_(shorty_len), 195 gpr_args_(reinterpret_cast<byte*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Gpr1Offset), 196 fpr_args_(reinterpret_cast<byte*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_Fpr1Offset), 197 stack_args_(reinterpret_cast<byte*>(sp) + kQuickCalleeSaveFrame_RefAndArgs_FrameSize 198 + StackArgumentStartFromShorty(is_static, shorty, shorty_len)), 199 gpr_index_(0), fpr_index_(0), stack_index_(0), cur_type_(Primitive::kPrimVoid), 200 is_split_long_or_double_(false) { 201 DCHECK_EQ(kQuickCalleeSaveFrame_RefAndArgs_FrameSize, 202 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs)->GetFrameSizeInBytes()); 203 } 204 205 virtual ~QuickArgumentVisitor() {} 206 207 virtual void Visit() = 0; 208 209 Primitive::Type GetParamPrimitiveType() const { 210 return cur_type_; 211 } 212 213 byte* GetParamAddress() const { 214 if (!kQuickSoftFloatAbi) { 215 Primitive::Type type = GetParamPrimitiveType(); 216 if (UNLIKELY((type == Primitive::kPrimDouble) || (type == Primitive::kPrimFloat))) { 217 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 218 return fpr_args_ + (fpr_index_ * kBytesPerFprSpillLocation); 219 } 220 } 221 } 222 if (gpr_index_ < kNumQuickGprArgs) { 223 return gpr_args_ + GprIndexToGprOffset(gpr_index_); 224 } 225 return stack_args_ + (stack_index_ * kBytesStackArgLocation); 226 } 227 228 bool IsSplitLongOrDouble() const { 229 if ((kBytesPerGprSpillLocation == 4) || (kBytesPerFprSpillLocation == 4)) { 230 return is_split_long_or_double_; 231 } else { 232 return false; // An optimization for when GPR and FPRs are 64bit. 233 } 234 } 235 236 bool IsParamAReference() const { 237 return GetParamPrimitiveType() == Primitive::kPrimNot; 238 } 239 240 bool IsParamALongOrDouble() const { 241 Primitive::Type type = GetParamPrimitiveType(); 242 return type == Primitive::kPrimLong || type == Primitive::kPrimDouble; 243 } 244 245 uint64_t ReadSplitLongParam() const { 246 DCHECK(IsSplitLongOrDouble()); 247 uint64_t low_half = *reinterpret_cast<uint32_t*>(GetParamAddress()); 248 uint64_t high_half = *reinterpret_cast<uint32_t*>(stack_args_); 249 return (low_half & 0xffffffffULL) | (high_half << 32); 250 } 251 252 void VisitArguments() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 253 gpr_index_ = 0; 254 fpr_index_ = 0; 255 stack_index_ = 0; 256 if (!is_static_) { // Handle this. 257 cur_type_ = Primitive::kPrimNot; 258 is_split_long_or_double_ = false; 259 Visit(); 260 if (kNumQuickGprArgs > 0) { 261 gpr_index_++; 262 } else { 263 stack_index_++; 264 } 265 } 266 for (uint32_t shorty_index = 1; shorty_index < shorty_len_; ++shorty_index) { 267 cur_type_ = Primitive::GetType(shorty_[shorty_index]); 268 switch (cur_type_) { 269 case Primitive::kPrimNot: 270 case Primitive::kPrimBoolean: 271 case Primitive::kPrimByte: 272 case Primitive::kPrimChar: 273 case Primitive::kPrimShort: 274 case Primitive::kPrimInt: 275 is_split_long_or_double_ = false; 276 Visit(); 277 if (gpr_index_ < kNumQuickGprArgs) { 278 gpr_index_++; 279 } else { 280 stack_index_++; 281 } 282 break; 283 case Primitive::kPrimFloat: 284 is_split_long_or_double_ = false; 285 Visit(); 286 if (kQuickSoftFloatAbi) { 287 if (gpr_index_ < kNumQuickGprArgs) { 288 gpr_index_++; 289 } else { 290 stack_index_++; 291 } 292 } else { 293 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 294 fpr_index_++; 295 } else { 296 stack_index_++; 297 } 298 } 299 break; 300 case Primitive::kPrimDouble: 301 case Primitive::kPrimLong: 302 if (kQuickSoftFloatAbi || (cur_type_ == Primitive::kPrimLong)) { 303 is_split_long_or_double_ = (kBytesPerGprSpillLocation == 4) && 304 ((gpr_index_ + 1) == kNumQuickGprArgs); 305 Visit(); 306 if (gpr_index_ < kNumQuickGprArgs) { 307 gpr_index_++; 308 if (kBytesPerGprSpillLocation == 4) { 309 if (gpr_index_ < kNumQuickGprArgs) { 310 gpr_index_++; 311 } else { 312 stack_index_++; 313 } 314 } 315 } else { 316 if (kBytesStackArgLocation == 4) { 317 stack_index_+= 2; 318 } else { 319 CHECK_EQ(kBytesStackArgLocation, 8U); 320 stack_index_++; 321 } 322 } 323 } else { 324 is_split_long_or_double_ = (kBytesPerFprSpillLocation == 4) && 325 ((fpr_index_ + 1) == kNumQuickFprArgs); 326 Visit(); 327 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 328 fpr_index_++; 329 if (kBytesPerFprSpillLocation == 4) { 330 if ((kNumQuickFprArgs != 0) && (fpr_index_ + 1 < kNumQuickFprArgs + 1)) { 331 fpr_index_++; 332 } else { 333 stack_index_++; 334 } 335 } 336 } else { 337 if (kBytesStackArgLocation == 4) { 338 stack_index_+= 2; 339 } else { 340 CHECK_EQ(kBytesStackArgLocation, 8U); 341 stack_index_++; 342 } 343 } 344 } 345 break; 346 default: 347 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty_; 348 } 349 } 350 } 351 352 private: 353 static size_t StackArgumentStartFromShorty(bool is_static, const char* shorty, 354 uint32_t shorty_len) { 355 if (kQuickSoftFloatAbi) { 356 CHECK_EQ(kNumQuickFprArgs, 0U); 357 return (kNumQuickGprArgs * kBytesPerGprSpillLocation) + kBytesPerGprSpillLocation /* ArtMethod* */; 358 } else { 359 size_t offset = kBytesPerGprSpillLocation; // Skip Method*. 360 size_t gprs_seen = 0; 361 size_t fprs_seen = 0; 362 if (!is_static && (gprs_seen < kNumQuickGprArgs)) { 363 gprs_seen++; 364 offset += kBytesStackArgLocation; 365 } 366 for (uint32_t i = 1; i < shorty_len; ++i) { 367 switch (shorty[i]) { 368 case 'Z': 369 case 'B': 370 case 'C': 371 case 'S': 372 case 'I': 373 case 'L': 374 if (gprs_seen < kNumQuickGprArgs) { 375 gprs_seen++; 376 offset += kBytesStackArgLocation; 377 } 378 break; 379 case 'J': 380 if (gprs_seen < kNumQuickGprArgs) { 381 gprs_seen++; 382 offset += 2 * kBytesStackArgLocation; 383 if (kBytesPerGprSpillLocation == 4) { 384 if (gprs_seen < kNumQuickGprArgs) { 385 gprs_seen++; 386 } 387 } 388 } 389 break; 390 case 'F': 391 if ((kNumQuickFprArgs != 0) && (fprs_seen + 1 < kNumQuickFprArgs + 1)) { 392 fprs_seen++; 393 offset += kBytesStackArgLocation; 394 } 395 break; 396 case 'D': 397 if ((kNumQuickFprArgs != 0) && (fprs_seen + 1 < kNumQuickFprArgs + 1)) { 398 fprs_seen++; 399 offset += 2 * kBytesStackArgLocation; 400 if (kBytesPerFprSpillLocation == 4) { 401 if ((kNumQuickFprArgs != 0) && (fprs_seen + 1 < kNumQuickFprArgs + 1)) { 402 fprs_seen++; 403 } 404 } 405 } 406 break; 407 default: 408 LOG(FATAL) << "Unexpected shorty character: " << shorty[i] << " in " << shorty; 409 } 410 } 411 return offset; 412 } 413 } 414 415 const bool is_static_; 416 const char* const shorty_; 417 const uint32_t shorty_len_; 418 byte* const gpr_args_; // Address of GPR arguments in callee save frame. 419 byte* const fpr_args_; // Address of FPR arguments in callee save frame. 420 byte* const stack_args_; // Address of stack arguments in caller's frame. 421 uint32_t gpr_index_; // Index into spilled GPRs. 422 uint32_t fpr_index_; // Index into spilled FPRs. 423 uint32_t stack_index_; // Index into arguments on the stack. 424 // The current type of argument during VisitArguments. 425 Primitive::Type cur_type_; 426 // Does a 64bit parameter straddle the register and stack arguments? 427 bool is_split_long_or_double_; 428}; 429 430// Visits arguments on the stack placing them into the shadow frame. 431class BuildQuickShadowFrameVisitor FINAL : public QuickArgumentVisitor { 432 public: 433 BuildQuickShadowFrameVisitor(mirror::ArtMethod** sp, bool is_static, const char* shorty, 434 uint32_t shorty_len, ShadowFrame* sf, size_t first_arg_reg) : 435 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), sf_(sf), cur_reg_(first_arg_reg) {} 436 437 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 438 439 private: 440 ShadowFrame* const sf_; 441 uint32_t cur_reg_; 442 443 DISALLOW_COPY_AND_ASSIGN(BuildQuickShadowFrameVisitor); 444}; 445 446void BuildQuickShadowFrameVisitor::Visit() { 447 Primitive::Type type = GetParamPrimitiveType(); 448 switch (type) { 449 case Primitive::kPrimLong: // Fall-through. 450 case Primitive::kPrimDouble: 451 if (IsSplitLongOrDouble()) { 452 sf_->SetVRegLong(cur_reg_, ReadSplitLongParam()); 453 } else { 454 sf_->SetVRegLong(cur_reg_, *reinterpret_cast<jlong*>(GetParamAddress())); 455 } 456 ++cur_reg_; 457 break; 458 case Primitive::kPrimNot: { 459 StackReference<mirror::Object>* stack_ref = 460 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 461 sf_->SetVRegReference(cur_reg_, stack_ref->AsMirrorPtr()); 462 } 463 break; 464 case Primitive::kPrimBoolean: // Fall-through. 465 case Primitive::kPrimByte: // Fall-through. 466 case Primitive::kPrimChar: // Fall-through. 467 case Primitive::kPrimShort: // Fall-through. 468 case Primitive::kPrimInt: // Fall-through. 469 case Primitive::kPrimFloat: 470 sf_->SetVReg(cur_reg_, *reinterpret_cast<jint*>(GetParamAddress())); 471 break; 472 case Primitive::kPrimVoid: 473 LOG(FATAL) << "UNREACHABLE"; 474 break; 475 } 476 ++cur_reg_; 477} 478 479extern "C" uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 480 mirror::ArtMethod** sp) 481 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 482 // Ensure we don't get thread suspension until the object arguments are safely in the shadow 483 // frame. 484 FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsAndArgs); 485 486 if (method->IsAbstract()) { 487 ThrowAbstractMethodError(method); 488 return 0; 489 } else { 490 DCHECK(!method->IsNative()) << PrettyMethod(method); 491 const char* old_cause = self->StartAssertNoThreadSuspension("Building interpreter shadow frame"); 492 MethodHelper mh(method); 493 const DexFile::CodeItem* code_item = mh.GetCodeItem(); 494 DCHECK(code_item != nullptr) << PrettyMethod(method); 495 uint16_t num_regs = code_item->registers_size_; 496 void* memory = alloca(ShadowFrame::ComputeSize(num_regs)); 497 ShadowFrame* shadow_frame(ShadowFrame::Create(num_regs, NULL, // No last shadow coming from quick. 498 method, 0, memory)); 499 size_t first_arg_reg = code_item->registers_size_ - code_item->ins_size_; 500 BuildQuickShadowFrameVisitor shadow_frame_builder(sp, mh.IsStatic(), mh.GetShorty(), 501 mh.GetShortyLength(), 502 shadow_frame, first_arg_reg); 503 shadow_frame_builder.VisitArguments(); 504 // Push a transition back into managed code onto the linked list in thread. 505 ManagedStack fragment; 506 self->PushManagedStackFragment(&fragment); 507 self->PushShadowFrame(shadow_frame); 508 self->EndAssertNoThreadSuspension(old_cause); 509 510 if (method->IsStatic() && !method->GetDeclaringClass()->IsInitializing()) { 511 // Ensure static method's class is initialized. 512 SirtRef<mirror::Class> sirt_c(self, method->GetDeclaringClass()); 513 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(sirt_c, true, true)) { 514 DCHECK(Thread::Current()->IsExceptionPending()) << PrettyMethod(method); 515 self->PopManagedStackFragment(fragment); 516 return 0; 517 } 518 } 519 520 JValue result = interpreter::EnterInterpreterFromStub(self, mh, code_item, *shadow_frame); 521 // Pop transition. 522 self->PopManagedStackFragment(fragment); 523 // No need to restore the args since the method has already been run by the interpreter. 524 return result.GetJ(); 525 } 526} 527 528// Visits arguments on the stack placing them into the args vector, Object* arguments are converted 529// to jobjects. 530class BuildQuickArgumentVisitor FINAL : public QuickArgumentVisitor { 531 public: 532 BuildQuickArgumentVisitor(mirror::ArtMethod** sp, bool is_static, const char* shorty, 533 uint32_t shorty_len, ScopedObjectAccessUnchecked* soa, 534 std::vector<jvalue>* args) : 535 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa), args_(args) {} 536 537 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 538 539 void FixupReferences() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 540 541 private: 542 ScopedObjectAccessUnchecked* const soa_; 543 std::vector<jvalue>* const args_; 544 // References which we must update when exiting in case the GC moved the objects. 545 std::vector<std::pair<jobject, StackReference<mirror::Object>*> > references_; 546 547 DISALLOW_COPY_AND_ASSIGN(BuildQuickArgumentVisitor); 548}; 549 550void BuildQuickArgumentVisitor::Visit() { 551 jvalue val; 552 Primitive::Type type = GetParamPrimitiveType(); 553 switch (type) { 554 case Primitive::kPrimNot: { 555 StackReference<mirror::Object>* stack_ref = 556 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 557 val.l = soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 558 references_.push_back(std::make_pair(val.l, stack_ref)); 559 break; 560 } 561 case Primitive::kPrimLong: // Fall-through. 562 case Primitive::kPrimDouble: 563 if (IsSplitLongOrDouble()) { 564 val.j = ReadSplitLongParam(); 565 } else { 566 val.j = *reinterpret_cast<jlong*>(GetParamAddress()); 567 } 568 break; 569 case Primitive::kPrimBoolean: // Fall-through. 570 case Primitive::kPrimByte: // Fall-through. 571 case Primitive::kPrimChar: // Fall-through. 572 case Primitive::kPrimShort: // Fall-through. 573 case Primitive::kPrimInt: // Fall-through. 574 case Primitive::kPrimFloat: 575 val.i = *reinterpret_cast<jint*>(GetParamAddress()); 576 break; 577 case Primitive::kPrimVoid: 578 LOG(FATAL) << "UNREACHABLE"; 579 val.j = 0; 580 break; 581 } 582 args_->push_back(val); 583} 584 585void BuildQuickArgumentVisitor::FixupReferences() { 586 // Fixup any references which may have changed. 587 for (const auto& pair : references_) { 588 pair.second->Assign(soa_->Decode<mirror::Object*>(pair.first)); 589 } 590} 591 592// Handler for invocation on proxy methods. On entry a frame will exist for the proxy object method 593// which is responsible for recording callee save registers. We explicitly place into jobjects the 594// incoming reference arguments (so they survive GC). We invoke the invocation handler, which is a 595// field within the proxy object, which will box the primitive arguments and deal with error cases. 596extern "C" uint64_t artQuickProxyInvokeHandler(mirror::ArtMethod* proxy_method, 597 mirror::Object* receiver, 598 Thread* self, mirror::ArtMethod** sp) 599 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 600 DCHECK(proxy_method->IsProxyMethod()) << PrettyMethod(proxy_method); 601 DCHECK(receiver->GetClass()->IsProxyClass()) << PrettyMethod(proxy_method); 602 // Ensure we don't get thread suspension until the object arguments are safely in jobjects. 603 const char* old_cause = 604 self->StartAssertNoThreadSuspension("Adding to IRT proxy object arguments"); 605 // Register the top of the managed stack, making stack crawlable. 606 DCHECK_EQ(*sp, proxy_method) << PrettyMethod(proxy_method); 607 self->SetTopOfStack(sp, 0); 608 DCHECK_EQ(proxy_method->GetFrameSizeInBytes(), 609 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs)->GetFrameSizeInBytes()) 610 << PrettyMethod(proxy_method); 611 self->VerifyStack(); 612 // Start new JNI local reference state. 613 JNIEnvExt* env = self->GetJniEnv(); 614 ScopedObjectAccessUnchecked soa(env); 615 ScopedJniEnvLocalRefState env_state(env); 616 // Create local ref. copies of proxy method and the receiver. 617 jobject rcvr_jobj = soa.AddLocalReference<jobject>(receiver); 618 619 // Placing arguments into args vector and remove the receiver. 620 MethodHelper proxy_mh(proxy_method); 621 DCHECK(!proxy_mh.IsStatic()) << PrettyMethod(proxy_method); 622 std::vector<jvalue> args; 623 BuildQuickArgumentVisitor local_ref_visitor(sp, proxy_mh.IsStatic(), proxy_mh.GetShorty(), 624 proxy_mh.GetShortyLength(), &soa, &args); 625 626 local_ref_visitor.VisitArguments(); 627 DCHECK_GT(args.size(), 0U) << PrettyMethod(proxy_method); 628 args.erase(args.begin()); 629 630 // Convert proxy method into expected interface method. 631 mirror::ArtMethod* interface_method = proxy_method->FindOverriddenMethod(); 632 DCHECK(interface_method != NULL) << PrettyMethod(proxy_method); 633 DCHECK(!interface_method->IsProxyMethod()) << PrettyMethod(interface_method); 634 jobject interface_method_jobj = soa.AddLocalReference<jobject>(interface_method); 635 636 // All naked Object*s should now be in jobjects, so its safe to go into the main invoke code 637 // that performs allocations. 638 self->EndAssertNoThreadSuspension(old_cause); 639 JValue result = InvokeProxyInvocationHandler(soa, proxy_mh.GetShorty(), 640 rcvr_jobj, interface_method_jobj, args); 641 // Restore references which might have moved. 642 local_ref_visitor.FixupReferences(); 643 return result.GetJ(); 644} 645 646// Read object references held in arguments from quick frames and place in a JNI local references, 647// so they don't get garbage collected. 648class RememberForGcArgumentVisitor FINAL : public QuickArgumentVisitor { 649 public: 650 RememberForGcArgumentVisitor(mirror::ArtMethod** sp, bool is_static, const char* shorty, 651 uint32_t shorty_len, ScopedObjectAccessUnchecked* soa) : 652 QuickArgumentVisitor(sp, is_static, shorty, shorty_len), soa_(soa) {} 653 654 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 655 656 void FixupReferences() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 657 658 private: 659 ScopedObjectAccessUnchecked* const soa_; 660 // References which we must update when exiting in case the GC moved the objects. 661 std::vector<std::pair<jobject, StackReference<mirror::Object>*> > references_; 662 DISALLOW_COPY_AND_ASSIGN(RememberForGcArgumentVisitor); 663}; 664 665void RememberForGcArgumentVisitor::Visit() { 666 if (IsParamAReference()) { 667 StackReference<mirror::Object>* stack_ref = 668 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 669 jobject reference = 670 soa_->AddLocalReference<jobject>(stack_ref->AsMirrorPtr()); 671 references_.push_back(std::make_pair(reference, stack_ref)); 672 } 673} 674 675void RememberForGcArgumentVisitor::FixupReferences() { 676 // Fixup any references which may have changed. 677 for (const auto& pair : references_) { 678 pair.second->Assign(soa_->Decode<mirror::Object*>(pair.first)); 679 } 680} 681 682 683// Lazily resolve a method for quick. Called by stub code. 684extern "C" const void* artQuickResolutionTrampoline(mirror::ArtMethod* called, 685 mirror::Object* receiver, 686 Thread* self, mirror::ArtMethod** sp) 687 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 688 FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsAndArgs); 689 // Start new JNI local reference state 690 JNIEnvExt* env = self->GetJniEnv(); 691 ScopedObjectAccessUnchecked soa(env); 692 ScopedJniEnvLocalRefState env_state(env); 693 const char* old_cause = self->StartAssertNoThreadSuspension("Quick method resolution set up"); 694 695 // Compute details about the called method (avoid GCs) 696 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 697 mirror::ArtMethod* caller = QuickArgumentVisitor::GetCallingMethod(sp); 698 InvokeType invoke_type; 699 const DexFile* dex_file; 700 uint32_t dex_method_idx; 701 if (called->IsRuntimeMethod()) { 702 uint32_t dex_pc = caller->ToDexPc(QuickArgumentVisitor::GetCallingPc(sp)); 703 const DexFile::CodeItem* code; 704 { 705 MethodHelper mh(caller); 706 dex_file = &mh.GetDexFile(); 707 code = mh.GetCodeItem(); 708 } 709 CHECK_LT(dex_pc, code->insns_size_in_code_units_); 710 const Instruction* instr = Instruction::At(&code->insns_[dex_pc]); 711 Instruction::Code instr_code = instr->Opcode(); 712 bool is_range; 713 switch (instr_code) { 714 case Instruction::INVOKE_DIRECT: 715 invoke_type = kDirect; 716 is_range = false; 717 break; 718 case Instruction::INVOKE_DIRECT_RANGE: 719 invoke_type = kDirect; 720 is_range = true; 721 break; 722 case Instruction::INVOKE_STATIC: 723 invoke_type = kStatic; 724 is_range = false; 725 break; 726 case Instruction::INVOKE_STATIC_RANGE: 727 invoke_type = kStatic; 728 is_range = true; 729 break; 730 case Instruction::INVOKE_SUPER: 731 invoke_type = kSuper; 732 is_range = false; 733 break; 734 case Instruction::INVOKE_SUPER_RANGE: 735 invoke_type = kSuper; 736 is_range = true; 737 break; 738 case Instruction::INVOKE_VIRTUAL: 739 invoke_type = kVirtual; 740 is_range = false; 741 break; 742 case Instruction::INVOKE_VIRTUAL_RANGE: 743 invoke_type = kVirtual; 744 is_range = true; 745 break; 746 case Instruction::INVOKE_INTERFACE: 747 invoke_type = kInterface; 748 is_range = false; 749 break; 750 case Instruction::INVOKE_INTERFACE_RANGE: 751 invoke_type = kInterface; 752 is_range = true; 753 break; 754 default: 755 LOG(FATAL) << "Unexpected call into trampoline: " << instr->DumpString(NULL); 756 // Avoid used uninitialized warnings. 757 invoke_type = kDirect; 758 is_range = false; 759 } 760 dex_method_idx = (is_range) ? instr->VRegB_3rc() : instr->VRegB_35c(); 761 762 } else { 763 invoke_type = kStatic; 764 dex_file = &MethodHelper(called).GetDexFile(); 765 dex_method_idx = called->GetDexMethodIndex(); 766 } 767 uint32_t shorty_len; 768 const char* shorty = 769 dex_file->GetMethodShorty(dex_file->GetMethodId(dex_method_idx), &shorty_len); 770 RememberForGcArgumentVisitor visitor(sp, invoke_type == kStatic, shorty, shorty_len, &soa); 771 visitor.VisitArguments(); 772 self->EndAssertNoThreadSuspension(old_cause); 773 bool virtual_or_interface = invoke_type == kVirtual || invoke_type == kInterface; 774 // Resolve method filling in dex cache. 775 if (called->IsRuntimeMethod()) { 776 SirtRef<mirror::Object> sirt_receiver(soa.Self(), virtual_or_interface ? receiver : nullptr); 777 called = linker->ResolveMethod(dex_method_idx, caller, invoke_type); 778 receiver = sirt_receiver.get(); 779 } 780 const void* code = NULL; 781 if (LIKELY(!self->IsExceptionPending())) { 782 // Incompatible class change should have been handled in resolve method. 783 CHECK(!called->CheckIncompatibleClassChange(invoke_type)) 784 << PrettyMethod(called) << " " << invoke_type; 785 if (virtual_or_interface) { 786 // Refine called method based on receiver. 787 CHECK(receiver != nullptr) << invoke_type; 788 if (invoke_type == kVirtual) { 789 called = receiver->GetClass()->FindVirtualMethodForVirtual(called); 790 } else { 791 called = receiver->GetClass()->FindVirtualMethodForInterface(called); 792 } 793 // We came here because of sharpening. Ensure the dex cache is up-to-date on the method index 794 // of the sharpened method. 795 if (called->GetDexCacheResolvedMethods() == caller->GetDexCacheResolvedMethods()) { 796 caller->GetDexCacheResolvedMethods()->Set<false>(called->GetDexMethodIndex(), called); 797 } else { 798 // Calling from one dex file to another, need to compute the method index appropriate to 799 // the caller's dex file. Since we get here only if the original called was a runtime 800 // method, we've got the correct dex_file and a dex_method_idx from above. 801 DCHECK(&MethodHelper(caller).GetDexFile() == dex_file); 802 uint32_t method_index = 803 MethodHelper(called).FindDexMethodIndexInOtherDexFile(*dex_file, dex_method_idx); 804 if (method_index != DexFile::kDexNoIndex) { 805 caller->GetDexCacheResolvedMethods()->Set<false>(method_index, called); 806 } 807 } 808 } 809 // Ensure that the called method's class is initialized. 810 SirtRef<mirror::Class> called_class(soa.Self(), called->GetDeclaringClass()); 811 linker->EnsureInitialized(called_class, true, true); 812 if (LIKELY(called_class->IsInitialized())) { 813 code = called->GetEntryPointFromQuickCompiledCode(); 814 } else if (called_class->IsInitializing()) { 815 if (invoke_type == kStatic) { 816 // Class is still initializing, go to oat and grab code (trampoline must be left in place 817 // until class is initialized to stop races between threads). 818 code = linker->GetQuickOatCodeFor(called); 819 } else { 820 // No trampoline for non-static methods. 821 code = called->GetEntryPointFromQuickCompiledCode(); 822 } 823 } else { 824 DCHECK(called_class->IsErroneous()); 825 } 826 } 827 CHECK_EQ(code == NULL, self->IsExceptionPending()); 828 // Fixup any locally saved objects may have moved during a GC. 829 visitor.FixupReferences(); 830 // Place called method in callee-save frame to be placed as first argument to quick method. 831 *sp = called; 832 return code; 833} 834 835 836 837/* 838 * This class uses a couple of observations to unite the different calling conventions through 839 * a few constants. 840 * 841 * 1) Number of registers used for passing is normally even, so counting down has no penalty for 842 * possible alignment. 843 * 2) Known 64b architectures store 8B units on the stack, both for integral and floating point 844 * types, so using uintptr_t is OK. Also means that we can use kRegistersNeededX to denote 845 * when we have to split things 846 * 3) The only soft-float, Arm, is 32b, so no widening needs to be taken into account for floats 847 * and we can use Int handling directly. 848 * 4) Only 64b architectures widen, and their stack is aligned 8B anyways, so no padding code 849 * necessary when widening. Also, widening of Ints will take place implicitly, and the 850 * extension should be compatible with Aarch64, which mandates copying the available bits 851 * into LSB and leaving the rest unspecified. 852 * 5) Aligning longs and doubles is necessary on arm only, and it's the same in registers and on 853 * the stack. 854 * 6) There is only little endian. 855 * 856 * 857 * Actual work is supposed to be done in a delegate of the template type. The interface is as 858 * follows: 859 * 860 * void PushGpr(uintptr_t): Add a value for the next GPR 861 * 862 * void PushFpr4(float): Add a value for the next FPR of size 32b. Is only called if we need 863 * padding, that is, think the architecture is 32b and aligns 64b. 864 * 865 * void PushFpr8(uint64_t): Push a double. We _will_ call this on 32b, it's the callee's job to 866 * split this if necessary. The current state will have aligned, if 867 * necessary. 868 * 869 * void PushStack(uintptr_t): Push a value to the stack. 870 * 871 * uintptr_t PushSirt(mirror::Object* ref): Add a reference to the Sirt. This _will_ have nullptr, 872 * as this might be important for null initialization. 873 * Must return the jobject, that is, the reference to the 874 * entry in the Sirt (nullptr if necessary). 875 * 876 */ 877template <class T> class BuildGenericJniFrameStateMachine { 878 public: 879#if defined(__arm__) 880 // TODO: These are all dummy values! 881 static constexpr bool kNativeSoftFloatAbi = true; 882 static constexpr size_t kNumNativeGprArgs = 4; // 4 arguments passed in GPRs, r0-r3 883 static constexpr size_t kNumNativeFprArgs = 0; // 0 arguments passed in FPRs. 884 885 static constexpr size_t kRegistersNeededForLong = 2; 886 static constexpr size_t kRegistersNeededForDouble = 2; 887 static constexpr bool kMultiRegistersAligned = true; 888 static constexpr bool kMultiRegistersWidened = false; 889 static constexpr bool kAlignLongOnStack = true; 890 static constexpr bool kAlignDoubleOnStack = true; 891#elif defined(__mips__) 892 // TODO: These are all dummy values! 893 static constexpr bool kNativeSoftFloatAbi = true; // This is a hard float ABI. 894 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 895 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 896 897 static constexpr size_t kRegistersNeededForLong = 2; 898 static constexpr size_t kRegistersNeededForDouble = 2; 899 static constexpr bool kMultiRegistersAligned = true; 900 static constexpr bool kMultiRegistersWidened = true; 901 static constexpr bool kAlignLongOnStack = false; 902 static constexpr bool kAlignDoubleOnStack = false; 903#elif defined(__i386__) 904 // TODO: Check these! 905 static constexpr bool kNativeSoftFloatAbi = false; // Not using int registers for fp 906 static constexpr size_t kNumNativeGprArgs = 0; // 6 arguments passed in GPRs. 907 static constexpr size_t kNumNativeFprArgs = 0; // 8 arguments passed in FPRs. 908 909 static constexpr size_t kRegistersNeededForLong = 2; 910 static constexpr size_t kRegistersNeededForDouble = 2; 911 static constexpr bool kMultiRegistersAligned = false; // x86 not using regs, anyways 912 static constexpr bool kMultiRegistersWidened = false; 913 static constexpr bool kAlignLongOnStack = false; 914 static constexpr bool kAlignDoubleOnStack = false; 915#elif defined(__x86_64__) 916 static constexpr bool kNativeSoftFloatAbi = false; // This is a hard float ABI. 917 static constexpr size_t kNumNativeGprArgs = 6; // 6 arguments passed in GPRs. 918 static constexpr size_t kNumNativeFprArgs = 8; // 8 arguments passed in FPRs. 919 920 static constexpr size_t kRegistersNeededForLong = 1; 921 static constexpr size_t kRegistersNeededForDouble = 1; 922 static constexpr bool kMultiRegistersAligned = false; 923 static constexpr bool kMultiRegistersWidened = false; 924 static constexpr bool kAlignLongOnStack = false; 925 static constexpr bool kAlignDoubleOnStack = false; 926#else 927#error "Unsupported architecture" 928#endif 929 930 public: 931 explicit BuildGenericJniFrameStateMachine(T* delegate) : gpr_index_(kNumNativeGprArgs), 932 fpr_index_(kNumNativeFprArgs), 933 stack_entries_(0), 934 delegate_(delegate) { 935 // For register alignment, we want to assume that counters (gpr_index_, fpr_index_) are even iff 936 // the next register is even; counting down is just to make the compiler happy... 937 CHECK_EQ(kNumNativeGprArgs % 2, 0U); 938 CHECK_EQ(kNumNativeFprArgs % 2, 0U); 939 } 940 941 virtual ~BuildGenericJniFrameStateMachine() {} 942 943 bool HavePointerGpr() { 944 return gpr_index_ > 0; 945 } 946 947 void AdvancePointer(void* val) { 948 if (HavePointerGpr()) { 949 gpr_index_--; 950 PushGpr(reinterpret_cast<uintptr_t>(val)); 951 } else { 952 stack_entries_++; // TODO: have a field for pointer length as multiple of 32b 953 PushStack(reinterpret_cast<uintptr_t>(val)); 954 gpr_index_ = 0; 955 } 956 } 957 958 959 bool HaveSirtGpr() { 960 return gpr_index_ > 0; 961 } 962 963 void AdvanceSirt(mirror::Object* ptr) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 964 uintptr_t sirtRef = PushSirt(ptr); 965 if (HaveSirtGpr()) { 966 gpr_index_--; 967 PushGpr(sirtRef); 968 } else { 969 stack_entries_++; 970 PushStack(sirtRef); 971 gpr_index_ = 0; 972 } 973 } 974 975 976 bool HaveIntGpr() { 977 return gpr_index_ > 0; 978 } 979 980 void AdvanceInt(uint32_t val) { 981 if (HaveIntGpr()) { 982 gpr_index_--; 983 PushGpr(val); 984 } else { 985 stack_entries_++; 986 PushStack(val); 987 gpr_index_ = 0; 988 } 989 } 990 991 992 bool HaveLongGpr() { 993 return gpr_index_ >= kRegistersNeededForLong + (LongGprNeedsPadding() ? 1 : 0); 994 } 995 996 bool LongGprNeedsPadding() { 997 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 998 kAlignLongOnStack && // and when it needs alignment 999 (gpr_index_ & 1) == 1; // counter is odd, see constructor 1000 } 1001 1002 bool LongStackNeedsPadding() { 1003 return kRegistersNeededForLong > 1 && // only pad when using multiple registers 1004 kAlignLongOnStack && // and when it needs 8B alignment 1005 (stack_entries_ & 1) == 1; // counter is odd 1006 } 1007 1008 void AdvanceLong(uint64_t val) { 1009 if (HaveLongGpr()) { 1010 if (LongGprNeedsPadding()) { 1011 PushGpr(0); 1012 gpr_index_--; 1013 } 1014 if (kRegistersNeededForLong == 1) { 1015 PushGpr(static_cast<uintptr_t>(val)); 1016 } else { 1017 PushGpr(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1018 PushGpr(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1019 } 1020 gpr_index_ -= kRegistersNeededForLong; 1021 } else { 1022 if (LongStackNeedsPadding()) { 1023 PushStack(0); 1024 stack_entries_++; 1025 } 1026 if (kRegistersNeededForLong == 1) { 1027 PushStack(static_cast<uintptr_t>(val)); 1028 stack_entries_++; 1029 } else { 1030 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1031 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1032 stack_entries_ += 2; 1033 } 1034 gpr_index_ = 0; 1035 } 1036 } 1037 1038 1039 bool HaveFloatFpr() { 1040 return fpr_index_ > 0; 1041 } 1042 1043 template <typename U, typename V> V convert(U in) { 1044 CHECK_LE(sizeof(U), sizeof(V)); 1045 union { U u; V v; } tmp; 1046 tmp.u = in; 1047 return tmp.v; 1048 } 1049 1050 void AdvanceFloat(float val) { 1051 if (kNativeSoftFloatAbi) { 1052 AdvanceInt(convert<float, uint32_t>(val)); 1053 } else { 1054 if (HaveFloatFpr()) { 1055 fpr_index_--; 1056 if (kRegistersNeededForDouble == 1) { 1057 if (kMultiRegistersWidened) { 1058 PushFpr8(convert<double, uint64_t>(val)); 1059 } else { 1060 // No widening, just use the bits. 1061 PushFpr8(convert<float, uint64_t>(val)); 1062 } 1063 } else { 1064 PushFpr4(val); 1065 } 1066 } else { 1067 stack_entries_++; 1068 if (kRegistersNeededForDouble == 1 && kMultiRegistersWidened) { 1069 // Need to widen before storing: Note the "double" in the template instantiation. 1070 PushStack(convert<double, uintptr_t>(val)); 1071 } else { 1072 PushStack(convert<float, uintptr_t>(val)); 1073 } 1074 fpr_index_ = 0; 1075 } 1076 } 1077 } 1078 1079 1080 bool HaveDoubleFpr() { 1081 return fpr_index_ >= kRegistersNeededForDouble + (DoubleFprNeedsPadding() ? 1 : 0); 1082 } 1083 1084 bool DoubleFprNeedsPadding() { 1085 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1086 kAlignDoubleOnStack && // and when it needs alignment 1087 (fpr_index_ & 1) == 1; // counter is odd, see constructor 1088 } 1089 1090 bool DoubleStackNeedsPadding() { 1091 return kRegistersNeededForDouble > 1 && // only pad when using multiple registers 1092 kAlignDoubleOnStack && // and when it needs 8B alignment 1093 (stack_entries_ & 1) == 1; // counter is odd 1094 } 1095 1096 void AdvanceDouble(uint64_t val) { 1097 if (kNativeSoftFloatAbi) { 1098 AdvanceLong(val); 1099 } else { 1100 if (HaveDoubleFpr()) { 1101 if (DoubleFprNeedsPadding()) { 1102 PushFpr4(0); 1103 fpr_index_--; 1104 } 1105 PushFpr8(val); 1106 fpr_index_ -= kRegistersNeededForDouble; 1107 } else { 1108 if (DoubleStackNeedsPadding()) { 1109 PushStack(0); 1110 stack_entries_++; 1111 } 1112 if (kRegistersNeededForDouble == 1) { 1113 PushStack(static_cast<uintptr_t>(val)); 1114 stack_entries_++; 1115 } else { 1116 PushStack(static_cast<uintptr_t>(val & 0xFFFFFFFF)); 1117 PushStack(static_cast<uintptr_t>((val >> 32) & 0xFFFFFFFF)); 1118 stack_entries_ += 2; 1119 } 1120 fpr_index_ = 0; 1121 } 1122 } 1123 } 1124 1125 uint32_t getStackEntries() { 1126 return stack_entries_; 1127 } 1128 1129 uint32_t getNumberOfUsedGprs() { 1130 return kNumNativeGprArgs - gpr_index_; 1131 } 1132 1133 uint32_t getNumberOfUsedFprs() { 1134 return kNumNativeFprArgs - fpr_index_; 1135 } 1136 1137 private: 1138 void PushGpr(uintptr_t val) { 1139 delegate_->PushGpr(val); 1140 } 1141 void PushFpr4(float val) { 1142 delegate_->PushFpr4(val); 1143 } 1144 void PushFpr8(uint64_t val) { 1145 delegate_->PushFpr8(val); 1146 } 1147 void PushStack(uintptr_t val) { 1148 delegate_->PushStack(val); 1149 } 1150 uintptr_t PushSirt(mirror::Object* ref) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1151 return delegate_->PushSirt(ref); 1152 } 1153 1154 uint32_t gpr_index_; // Number of free GPRs 1155 uint32_t fpr_index_; // Number of free FPRs 1156 uint32_t stack_entries_; // Stack entries are in multiples of 32b, as floats are usually not 1157 // extended 1158 T* delegate_; // What Push implementation gets called 1159}; 1160 1161class ComputeGenericJniFrameSize FINAL { 1162 public: 1163 ComputeGenericJniFrameSize() : num_sirt_references_(0), num_stack_entries_(0) {} 1164 1165 uint32_t GetStackSize() { 1166 return num_stack_entries_ * sizeof(uintptr_t); 1167 } 1168 1169 // WARNING: After this, *sp won't be pointing to the method anymore! 1170 void ComputeLayout(mirror::ArtMethod*** m, bool is_static, const char* shorty, uint32_t shorty_len, 1171 void* sp, StackIndirectReferenceTable** table, uint32_t* sirt_entries, 1172 uintptr_t** start_stack, uintptr_t** start_gpr, uint32_t** start_fpr, 1173 void** code_return, size_t* overall_size) 1174 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1175 ComputeAll(is_static, shorty, shorty_len); 1176 1177 mirror::ArtMethod* method = **m; 1178 1179 uint8_t* sp8 = reinterpret_cast<uint8_t*>(sp); 1180 1181 // First, fix up the layout of the callee-save frame. 1182 // We have to squeeze in the Sirt, and relocate the method pointer. 1183 1184 // "Free" the slot for the method. 1185 sp8 += kPointerSize; 1186 1187 // Add the Sirt. 1188 *sirt_entries = num_sirt_references_; 1189 size_t sirt_size = StackIndirectReferenceTable::GetAlignedSirtSize(num_sirt_references_); 1190 sp8 -= sirt_size; 1191 *table = reinterpret_cast<StackIndirectReferenceTable*>(sp8); 1192 (*table)->SetNumberOfReferences(num_sirt_references_); 1193 1194 // Add a slot for the method pointer, and fill it. Fix the pointer-pointer given to us. 1195 sp8 -= kPointerSize; 1196 uint8_t* method_pointer = sp8; 1197 *(reinterpret_cast<mirror::ArtMethod**>(method_pointer)) = method; 1198 *m = reinterpret_cast<mirror::ArtMethod**>(method_pointer); 1199 1200 // Reference cookie and padding 1201 sp8 -= 8; 1202 // Store Sirt size 1203 *reinterpret_cast<uint32_t*>(sp8) = static_cast<uint32_t>(sirt_size & 0xFFFFFFFF); 1204 1205 // Next comes the native call stack. 1206 sp8 -= GetStackSize(); 1207 // Now align the call stack below. This aligns by 16, as AArch64 seems to require. 1208 uintptr_t mask = ~0x0F; 1209 sp8 = reinterpret_cast<uint8_t*>(reinterpret_cast<uintptr_t>(sp8) & mask); 1210 *start_stack = reinterpret_cast<uintptr_t*>(sp8); 1211 1212 // put fprs and gprs below 1213 // Assumption is OK right now, as we have soft-float arm 1214 size_t fregs = BuildGenericJniFrameStateMachine<ComputeGenericJniFrameSize>::kNumNativeFprArgs; 1215 sp8 -= fregs * sizeof(uintptr_t); 1216 *start_fpr = reinterpret_cast<uint32_t*>(sp8); 1217 size_t iregs = BuildGenericJniFrameStateMachine<ComputeGenericJniFrameSize>::kNumNativeGprArgs; 1218 sp8 -= iregs * sizeof(uintptr_t); 1219 *start_gpr = reinterpret_cast<uintptr_t*>(sp8); 1220 1221 // reserve space for the code pointer 1222 sp8 -= kPointerSize; 1223 *code_return = reinterpret_cast<void*>(sp8); 1224 1225 *overall_size = reinterpret_cast<uint8_t*>(sp) - sp8; 1226 1227 // The new SP is stored at the end of the alloca, so it can be immediately popped 1228 sp8 = reinterpret_cast<uint8_t*>(sp) - 5 * KB; 1229 *(reinterpret_cast<uint8_t**>(sp8)) = method_pointer; 1230 } 1231 1232 void ComputeSirtOffset() { } // nothing to do, static right now 1233 1234 void ComputeAll(bool is_static, const char* shorty, uint32_t shorty_len) 1235 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1236 BuildGenericJniFrameStateMachine<ComputeGenericJniFrameSize> sm(this); 1237 1238 // JNIEnv 1239 sm.AdvancePointer(nullptr); 1240 1241 // Class object or this as first argument 1242 sm.AdvanceSirt(reinterpret_cast<mirror::Object*>(0x12345678)); 1243 1244 for (uint32_t i = 1; i < shorty_len; ++i) { 1245 Primitive::Type cur_type_ = Primitive::GetType(shorty[i]); 1246 switch (cur_type_) { 1247 case Primitive::kPrimNot: 1248 sm.AdvanceSirt(reinterpret_cast<mirror::Object*>(0x12345678)); 1249 break; 1250 1251 case Primitive::kPrimBoolean: 1252 case Primitive::kPrimByte: 1253 case Primitive::kPrimChar: 1254 case Primitive::kPrimShort: 1255 case Primitive::kPrimInt: 1256 sm.AdvanceInt(0); 1257 break; 1258 case Primitive::kPrimFloat: 1259 sm.AdvanceFloat(0); 1260 break; 1261 case Primitive::kPrimDouble: 1262 sm.AdvanceDouble(0); 1263 break; 1264 case Primitive::kPrimLong: 1265 sm.AdvanceLong(0); 1266 break; 1267 default: 1268 LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty; 1269 } 1270 } 1271 1272 num_stack_entries_ = sm.getStackEntries(); 1273 } 1274 1275 void PushGpr(uintptr_t /* val */) { 1276 // not optimizing registers, yet 1277 } 1278 1279 void PushFpr4(float /* val */) { 1280 // not optimizing registers, yet 1281 } 1282 1283 void PushFpr8(uint64_t /* val */) { 1284 // not optimizing registers, yet 1285 } 1286 1287 void PushStack(uintptr_t /* val */) { 1288 // counting is already done in the superclass 1289 } 1290 1291 uintptr_t PushSirt(mirror::Object* /* ptr */) { 1292 num_sirt_references_++; 1293 return reinterpret_cast<uintptr_t>(nullptr); 1294 } 1295 1296 private: 1297 uint32_t num_sirt_references_; 1298 uint32_t num_stack_entries_; 1299}; 1300 1301// Visits arguments on the stack placing them into a region lower down the stack for the benefit 1302// of transitioning into native code. 1303class BuildGenericJniFrameVisitor FINAL : public QuickArgumentVisitor { 1304 public: 1305 BuildGenericJniFrameVisitor(mirror::ArtMethod*** sp, bool is_static, const char* shorty, 1306 uint32_t shorty_len, Thread* self) : 1307 QuickArgumentVisitor(*sp, is_static, shorty, shorty_len), sm_(this) { 1308 ComputeGenericJniFrameSize fsc; 1309 fsc.ComputeLayout(sp, is_static, shorty, shorty_len, *sp, &sirt_, &sirt_expected_refs_, 1310 &cur_stack_arg_, &cur_gpr_reg_, &cur_fpr_reg_, &code_return_, 1311 &alloca_used_size_); 1312 sirt_number_of_references_ = 0; 1313 cur_sirt_entry_ = reinterpret_cast<StackReference<mirror::Object>*>(GetFirstSirtEntry()); 1314 1315 // jni environment is always first argument 1316 sm_.AdvancePointer(self->GetJniEnv()); 1317 1318 if (is_static) { 1319 sm_.AdvanceSirt((**sp)->GetDeclaringClass()); 1320 } 1321 } 1322 1323 void Visit() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE; 1324 1325 void FinalizeSirt(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 1326 1327 jobject GetFirstSirtEntry() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1328 return reinterpret_cast<jobject>(sirt_->GetStackReference(0)); 1329 } 1330 1331 void PushGpr(uintptr_t val) { 1332 *cur_gpr_reg_ = val; 1333 cur_gpr_reg_++; 1334 } 1335 1336 void PushFpr4(float val) { 1337 *cur_fpr_reg_ = val; 1338 cur_fpr_reg_++; 1339 } 1340 1341 void PushFpr8(uint64_t val) { 1342 uint64_t* tmp = reinterpret_cast<uint64_t*>(cur_fpr_reg_); 1343 *tmp = val; 1344 cur_fpr_reg_ += 2; 1345 } 1346 1347 void PushStack(uintptr_t val) { 1348 *cur_stack_arg_ = val; 1349 cur_stack_arg_++; 1350 } 1351 1352 uintptr_t PushSirt(mirror::Object* ref) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1353 uintptr_t tmp; 1354 if (ref == nullptr) { 1355 *cur_sirt_entry_ = StackReference<mirror::Object>(); 1356 tmp = reinterpret_cast<uintptr_t>(nullptr); 1357 } else { 1358 *cur_sirt_entry_ = StackReference<mirror::Object>::FromMirrorPtr(ref); 1359 tmp = reinterpret_cast<uintptr_t>(cur_sirt_entry_); 1360 } 1361 cur_sirt_entry_++; 1362 sirt_number_of_references_++; 1363 return tmp; 1364 } 1365 1366 // Size of the part of the alloca that we actually need. 1367 size_t GetAllocaUsedSize() { 1368 return alloca_used_size_; 1369 } 1370 1371 void* GetCodeReturn() { 1372 return code_return_; 1373 } 1374 1375 private: 1376 uint32_t sirt_number_of_references_; 1377 StackReference<mirror::Object>* cur_sirt_entry_; 1378 StackIndirectReferenceTable* sirt_; 1379 uint32_t sirt_expected_refs_; 1380 uintptr_t* cur_gpr_reg_; 1381 uint32_t* cur_fpr_reg_; 1382 uintptr_t* cur_stack_arg_; 1383 // StackReference<mirror::Object>* top_of_sirt_; 1384 void* code_return_; 1385 size_t alloca_used_size_; 1386 1387 BuildGenericJniFrameStateMachine<BuildGenericJniFrameVisitor> sm_; 1388 1389 DISALLOW_COPY_AND_ASSIGN(BuildGenericJniFrameVisitor); 1390}; 1391 1392void BuildGenericJniFrameVisitor::Visit() { 1393 Primitive::Type type = GetParamPrimitiveType(); 1394 switch (type) { 1395 case Primitive::kPrimLong: { 1396 jlong long_arg; 1397 if (IsSplitLongOrDouble()) { 1398 long_arg = ReadSplitLongParam(); 1399 } else { 1400 long_arg = *reinterpret_cast<jlong*>(GetParamAddress()); 1401 } 1402 sm_.AdvanceLong(long_arg); 1403 break; 1404 } 1405 case Primitive::kPrimDouble: { 1406 uint64_t double_arg; 1407 if (IsSplitLongOrDouble()) { 1408 // Read into union so that we don't case to a double. 1409 double_arg = ReadSplitLongParam(); 1410 } else { 1411 double_arg = *reinterpret_cast<uint64_t*>(GetParamAddress()); 1412 } 1413 sm_.AdvanceDouble(double_arg); 1414 break; 1415 } 1416 case Primitive::kPrimNot: { 1417 StackReference<mirror::Object>* stack_ref = 1418 reinterpret_cast<StackReference<mirror::Object>*>(GetParamAddress()); 1419 sm_.AdvanceSirt(stack_ref->AsMirrorPtr()); 1420 break; 1421 } 1422 case Primitive::kPrimFloat: 1423 sm_.AdvanceFloat(*reinterpret_cast<float*>(GetParamAddress())); 1424 break; 1425 case Primitive::kPrimBoolean: // Fall-through. 1426 case Primitive::kPrimByte: // Fall-through. 1427 case Primitive::kPrimChar: // Fall-through. 1428 case Primitive::kPrimShort: // Fall-through. 1429 case Primitive::kPrimInt: // Fall-through. 1430 sm_.AdvanceInt(*reinterpret_cast<jint*>(GetParamAddress())); 1431 break; 1432 case Primitive::kPrimVoid: 1433 LOG(FATAL) << "UNREACHABLE"; 1434 break; 1435 } 1436} 1437 1438void BuildGenericJniFrameVisitor::FinalizeSirt(Thread* self) { 1439 // Initialize padding entries. 1440 while (sirt_number_of_references_ < sirt_expected_refs_) { 1441 *cur_sirt_entry_ = StackReference<mirror::Object>(); 1442 cur_sirt_entry_++; 1443 sirt_number_of_references_++; 1444 } 1445 sirt_->SetNumberOfReferences(sirt_expected_refs_); 1446 DCHECK_NE(sirt_expected_refs_, 0U); 1447 // Install Sirt. 1448 self->PushSirt(sirt_); 1449} 1450 1451extern "C" void* artFindNativeMethod(); 1452 1453/* 1454 * Initializes an alloca region assumed to be directly below sp for a native call: 1455 * Create a Sirt and call stack and fill a mini stack with values to be pushed to registers. 1456 * The final element on the stack is a pointer to the native code. 1457 * 1458 * On entry, the stack has a standard callee-save frame above sp, and an alloca below it. 1459 * We need to fix this, as the Sirt needs to go into the callee-save frame. 1460 * 1461 * The return of this function denotes: 1462 * 1) How many bytes of the alloca can be released, if the value is non-negative. 1463 * 2) An error, if the value is negative. 1464 */ 1465extern "C" ssize_t artQuickGenericJniTrampoline(Thread* self, mirror::ArtMethod** sp) 1466 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1467 mirror::ArtMethod* called = *sp; 1468 DCHECK(called->IsNative()) << PrettyMethod(called, true); 1469 1470 // run the visitor 1471 MethodHelper mh(called); 1472 1473 BuildGenericJniFrameVisitor visitor(&sp, called->IsStatic(), mh.GetShorty(), mh.GetShortyLength(), 1474 self); 1475 visitor.VisitArguments(); 1476 visitor.FinalizeSirt(self); 1477 1478 // fix up managed-stack things in Thread 1479 self->SetTopOfStack(sp, 0); 1480 1481 self->VerifyStack(); 1482 1483 // Start JNI, save the cookie. 1484 uint32_t cookie; 1485 if (called->IsSynchronized()) { 1486 cookie = JniMethodStartSynchronized(visitor.GetFirstSirtEntry(), self); 1487 if (self->IsExceptionPending()) { 1488 self->PopSirt(); 1489 // A negative value denotes an error. 1490 return -1; 1491 } 1492 } else { 1493 cookie = JniMethodStart(self); 1494 } 1495 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 1496 *(sp32 - 1) = cookie; 1497 1498 // Retrieve the stored native code. 1499 const void* nativeCode = called->GetNativeMethod(); 1500 1501 // There are two cases for the content of nativeCode: 1502 // 1) Pointer to the native function. 1503 // 2) Pointer to the trampoline for native code binding. 1504 // In the second case, we need to execute the binding and continue with the actual native function 1505 // pointer. 1506 DCHECK(nativeCode != nullptr); 1507 if (nativeCode == GetJniDlsymLookupStub()) { 1508 nativeCode = artFindNativeMethod(); 1509 1510 if (nativeCode == nullptr) { 1511 DCHECK(self->IsExceptionPending()); // There should be an exception pending now. 1512 return -1; 1513 } 1514 // Note that the native code pointer will be automatically set by artFindNativeMethod(). 1515 } 1516 1517 // Store the native code pointer in the stack at the right location. 1518 uintptr_t* code_pointer = reinterpret_cast<uintptr_t*>(visitor.GetCodeReturn()); 1519 *code_pointer = reinterpret_cast<uintptr_t>(nativeCode); 1520 1521 // 5K reserved, window_size + frame pointer used. 1522 size_t window_size = visitor.GetAllocaUsedSize(); 1523 return (5 * KB) - window_size - kPointerSize; 1524} 1525 1526/* 1527 * Is called after the native JNI code. Responsible for cleanup (SIRT, saved state) and 1528 * unlocking. 1529 */ 1530extern "C" uint64_t artQuickGenericJniEndTrampoline(Thread* self, mirror::ArtMethod** sp, 1531 jvalue result, uint64_t result_f) 1532 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1533 uint32_t* sp32 = reinterpret_cast<uint32_t*>(sp); 1534 mirror::ArtMethod* called = *sp; 1535 uint32_t cookie = *(sp32 - 1); 1536 1537 MethodHelper mh(called); 1538 char return_shorty_char = mh.GetShorty()[0]; 1539 1540 if (return_shorty_char == 'L') { 1541 // the only special ending call 1542 if (called->IsSynchronized()) { 1543 StackIndirectReferenceTable* table = 1544 reinterpret_cast<StackIndirectReferenceTable*>( 1545 reinterpret_cast<uint8_t*>(sp) + kPointerSize); 1546 jobject tmp = reinterpret_cast<jobject>(table->GetStackReference(0)); 1547 1548 return reinterpret_cast<uint64_t>(JniMethodEndWithReferenceSynchronized(result.l, cookie, tmp, 1549 self)); 1550 } else { 1551 return reinterpret_cast<uint64_t>(JniMethodEndWithReference(result.l, cookie, self)); 1552 } 1553 } else { 1554 if (called->IsSynchronized()) { 1555 StackIndirectReferenceTable* table = 1556 reinterpret_cast<StackIndirectReferenceTable*>( 1557 reinterpret_cast<uint8_t*>(sp) + kPointerSize); 1558 jobject tmp = reinterpret_cast<jobject>(table->GetStackReference(0)); 1559 1560 JniMethodEndSynchronized(cookie, tmp, self); 1561 } else { 1562 JniMethodEnd(cookie, self); 1563 } 1564 1565 switch (return_shorty_char) { 1566 case 'F': // Fall-through. 1567 case 'D': 1568 return result_f; 1569 case 'Z': 1570 return result.z; 1571 case 'B': 1572 return result.b; 1573 case 'C': 1574 return result.c; 1575 case 'S': 1576 return result.s; 1577 case 'I': 1578 return result.i; 1579 case 'J': 1580 return result.j; 1581 case 'V': 1582 return 0; 1583 default: 1584 LOG(FATAL) << "Unexpected return shorty character " << return_shorty_char; 1585 return 0; 1586 } 1587 } 1588} 1589 1590} // namespace art 1591