Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/v8.h" |
| 6 | |
| 7 | #include "src/arguments.h" |
| 8 | #include "src/compiler.h" |
| 9 | #include "src/deoptimizer.h" |
| 10 | #include "src/frames.h" |
| 11 | #include "src/full-codegen.h" |
| 12 | #include "src/isolate-inl.h" |
| 13 | #include "src/runtime/runtime-utils.h" |
| 14 | #include "src/v8threads.h" |
| 15 | #include "src/vm-state-inl.h" |
| 16 | |
| 17 | namespace v8 { |
| 18 | namespace internal { |
| 19 | |
| 20 | RUNTIME_FUNCTION(Runtime_CompileLazy) { |
| 21 | HandleScope scope(isolate); |
| 22 | DCHECK(args.length() == 1); |
| 23 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| 24 | #ifdef DEBUG |
| 25 | if (FLAG_trace_lazy && !function->shared()->is_compiled()) { |
| 26 | PrintF("[unoptimized: "); |
| 27 | function->PrintName(); |
| 28 | PrintF("]\n"); |
| 29 | } |
| 30 | #endif |
| 31 | |
| 32 | // Compile the target function. |
| 33 | DCHECK(function->shared()->allows_lazy_compilation()); |
| 34 | |
| 35 | Handle<Code> code; |
| 36 | ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, code, |
| 37 | Compiler::GetLazyCode(function)); |
| 38 | DCHECK(code->kind() == Code::FUNCTION || |
| 39 | code->kind() == Code::OPTIMIZED_FUNCTION); |
| 40 | function->ReplaceCode(*code); |
| 41 | return *code; |
| 42 | } |
| 43 | |
| 44 | |
| 45 | RUNTIME_FUNCTION(Runtime_CompileOptimized) { |
| 46 | HandleScope scope(isolate); |
| 47 | DCHECK(args.length() == 2); |
| 48 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| 49 | CONVERT_BOOLEAN_ARG_CHECKED(concurrent, 1); |
| 50 | DCHECK(isolate->use_crankshaft()); |
| 51 | |
| 52 | Handle<Code> unoptimized(function->shared()->code()); |
| 53 | if (function->shared()->optimization_disabled() || |
| 54 | isolate->DebuggerHasBreakPoints()) { |
| 55 | // If the function is not optimizable or debugger is active continue |
| 56 | // using the code from the full compiler. |
| 57 | if (FLAG_trace_opt) { |
| 58 | PrintF("[failed to optimize "); |
| 59 | function->PrintName(); |
| 60 | PrintF(": is code optimizable: %s, is debugger enabled: %s]\n", |
| 61 | function->shared()->optimization_disabled() ? "F" : "T", |
| 62 | isolate->DebuggerHasBreakPoints() ? "T" : "F"); |
| 63 | } |
| 64 | function->ReplaceCode(*unoptimized); |
| 65 | return function->code(); |
| 66 | } |
| 67 | |
| 68 | Compiler::ConcurrencyMode mode = |
| 69 | concurrent ? Compiler::CONCURRENT : Compiler::NOT_CONCURRENT; |
| 70 | Handle<Code> code; |
| 71 | if (Compiler::GetOptimizedCode(function, unoptimized, mode).ToHandle(&code)) { |
| 72 | function->ReplaceCode(*code); |
| 73 | } else { |
| 74 | function->ReplaceCode(function->shared()->code()); |
| 75 | } |
| 76 | |
| 77 | DCHECK(function->code()->kind() == Code::FUNCTION || |
| 78 | function->code()->kind() == Code::OPTIMIZED_FUNCTION || |
| 79 | function->IsInOptimizationQueue()); |
| 80 | return function->code(); |
| 81 | } |
| 82 | |
| 83 | |
| 84 | RUNTIME_FUNCTION(Runtime_NotifyStubFailure) { |
| 85 | HandleScope scope(isolate); |
| 86 | DCHECK(args.length() == 0); |
| 87 | Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate); |
| 88 | DCHECK(AllowHeapAllocation::IsAllowed()); |
| 89 | delete deoptimizer; |
| 90 | return isolate->heap()->undefined_value(); |
| 91 | } |
| 92 | |
| 93 | |
| 94 | class ActivationsFinder : public ThreadVisitor { |
| 95 | public: |
| 96 | Code* code_; |
| 97 | bool has_code_activations_; |
| 98 | |
| 99 | explicit ActivationsFinder(Code* code) |
| 100 | : code_(code), has_code_activations_(false) {} |
| 101 | |
| 102 | void VisitThread(Isolate* isolate, ThreadLocalTop* top) { |
| 103 | JavaScriptFrameIterator it(isolate, top); |
| 104 | VisitFrames(&it); |
| 105 | } |
| 106 | |
| 107 | void VisitFrames(JavaScriptFrameIterator* it) { |
| 108 | for (; !it->done(); it->Advance()) { |
| 109 | JavaScriptFrame* frame = it->frame(); |
| 110 | if (code_->contains(frame->pc())) has_code_activations_ = true; |
| 111 | } |
| 112 | } |
| 113 | }; |
| 114 | |
| 115 | |
| 116 | RUNTIME_FUNCTION(Runtime_NotifyDeoptimized) { |
| 117 | HandleScope scope(isolate); |
| 118 | DCHECK(args.length() == 1); |
| 119 | CONVERT_SMI_ARG_CHECKED(type_arg, 0); |
| 120 | Deoptimizer::BailoutType type = |
| 121 | static_cast<Deoptimizer::BailoutType>(type_arg); |
| 122 | Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate); |
| 123 | DCHECK(AllowHeapAllocation::IsAllowed()); |
| 124 | |
| 125 | Handle<JSFunction> function = deoptimizer->function(); |
| 126 | Handle<Code> optimized_code = deoptimizer->compiled_code(); |
| 127 | |
| 128 | DCHECK(optimized_code->kind() == Code::OPTIMIZED_FUNCTION); |
| 129 | DCHECK(type == deoptimizer->bailout_type()); |
| 130 | |
| 131 | // Make sure to materialize objects before causing any allocation. |
| 132 | JavaScriptFrameIterator it(isolate); |
| 133 | deoptimizer->MaterializeHeapObjects(&it); |
| 134 | delete deoptimizer; |
| 135 | |
| 136 | JavaScriptFrame* frame = it.frame(); |
| 137 | RUNTIME_ASSERT(frame->function()->IsJSFunction()); |
| 138 | DCHECK(frame->function() == *function); |
| 139 | |
| 140 | // Avoid doing too much work when running with --always-opt and keep |
| 141 | // the optimized code around. |
| 142 | if (FLAG_always_opt || type == Deoptimizer::LAZY) { |
| 143 | return isolate->heap()->undefined_value(); |
| 144 | } |
| 145 | |
| 146 | // Search for other activations of the same function and code. |
| 147 | ActivationsFinder activations_finder(*optimized_code); |
| 148 | activations_finder.VisitFrames(&it); |
| 149 | isolate->thread_manager()->IterateArchivedThreads(&activations_finder); |
| 150 | |
| 151 | if (!activations_finder.has_code_activations_) { |
| 152 | if (function->code() == *optimized_code) { |
| 153 | if (FLAG_trace_deopt) { |
| 154 | PrintF("[removing optimized code for: "); |
| 155 | function->PrintName(); |
| 156 | PrintF("]\n"); |
| 157 | } |
| 158 | function->ReplaceCode(function->shared()->code()); |
| 159 | // Evict optimized code for this function from the cache so that it |
| 160 | // doesn't get used for new closures. |
| 161 | function->shared()->EvictFromOptimizedCodeMap(*optimized_code, |
| 162 | "notify deoptimized"); |
| 163 | } |
| 164 | } else { |
| 165 | // TODO(titzer): we should probably do DeoptimizeCodeList(code) |
| 166 | // unconditionally if the code is not already marked for deoptimization. |
| 167 | // If there is an index by shared function info, all the better. |
| 168 | Deoptimizer::DeoptimizeFunction(*function); |
| 169 | } |
| 170 | |
| 171 | return isolate->heap()->undefined_value(); |
| 172 | } |
| 173 | |
| 174 | |
| 175 | static bool IsSuitableForOnStackReplacement(Isolate* isolate, |
| 176 | Handle<JSFunction> function, |
| 177 | Handle<Code> current_code) { |
| 178 | // Keep track of whether we've succeeded in optimizing. |
| 179 | if (!current_code->optimizable()) return false; |
| 180 | // If we are trying to do OSR when there are already optimized |
| 181 | // activations of the function, it means (a) the function is directly or |
| 182 | // indirectly recursive and (b) an optimized invocation has been |
| 183 | // deoptimized so that we are currently in an unoptimized activation. |
| 184 | // Check for optimized activations of this function. |
| 185 | for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) { |
| 186 | JavaScriptFrame* frame = it.frame(); |
| 187 | if (frame->is_optimized() && frame->function() == *function) return false; |
| 188 | } |
| 189 | |
| 190 | return true; |
| 191 | } |
| 192 | |
| 193 | |
| 194 | RUNTIME_FUNCTION(Runtime_CompileForOnStackReplacement) { |
| 195 | HandleScope scope(isolate); |
| 196 | DCHECK(args.length() == 1); |
| 197 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| 198 | Handle<Code> caller_code(function->shared()->code()); |
| 199 | |
| 200 | // We're not prepared to handle a function with arguments object. |
| 201 | DCHECK(!function->shared()->uses_arguments()); |
| 202 | |
| 203 | RUNTIME_ASSERT(FLAG_use_osr); |
| 204 | |
| 205 | // Passing the PC in the javascript frame from the caller directly is |
| 206 | // not GC safe, so we walk the stack to get it. |
| 207 | JavaScriptFrameIterator it(isolate); |
| 208 | JavaScriptFrame* frame = it.frame(); |
| 209 | if (!caller_code->contains(frame->pc())) { |
| 210 | // Code on the stack may not be the code object referenced by the shared |
| 211 | // function info. It may have been replaced to include deoptimization data. |
| 212 | caller_code = Handle<Code>(frame->LookupCode()); |
| 213 | } |
| 214 | |
| 215 | uint32_t pc_offset = |
| 216 | static_cast<uint32_t>(frame->pc() - caller_code->instruction_start()); |
| 217 | |
| 218 | #ifdef DEBUG |
| 219 | DCHECK_EQ(frame->function(), *function); |
| 220 | DCHECK_EQ(frame->LookupCode(), *caller_code); |
| 221 | DCHECK(caller_code->contains(frame->pc())); |
| 222 | #endif // DEBUG |
| 223 | |
| 224 | |
| 225 | BailoutId ast_id = caller_code->TranslatePcOffsetToAstId(pc_offset); |
| 226 | DCHECK(!ast_id.IsNone()); |
| 227 | |
| 228 | Compiler::ConcurrencyMode mode = |
| 229 | isolate->concurrent_osr_enabled() && |
| 230 | (function->shared()->ast_node_count() > 512) |
| 231 | ? Compiler::CONCURRENT |
| 232 | : Compiler::NOT_CONCURRENT; |
| 233 | Handle<Code> result = Handle<Code>::null(); |
| 234 | |
| 235 | OptimizedCompileJob* job = NULL; |
| 236 | if (mode == Compiler::CONCURRENT) { |
| 237 | // Gate the OSR entry with a stack check. |
| 238 | BackEdgeTable::AddStackCheck(caller_code, pc_offset); |
| 239 | // Poll already queued compilation jobs. |
| 240 | OptimizingCompilerThread* thread = isolate->optimizing_compiler_thread(); |
| 241 | if (thread->IsQueuedForOSR(function, ast_id)) { |
| 242 | if (FLAG_trace_osr) { |
| 243 | PrintF("[OSR - Still waiting for queued: "); |
| 244 | function->PrintName(); |
| 245 | PrintF(" at AST id %d]\n", ast_id.ToInt()); |
| 246 | } |
| 247 | return NULL; |
| 248 | } |
| 249 | |
| 250 | job = thread->FindReadyOSRCandidate(function, ast_id); |
| 251 | } |
| 252 | |
| 253 | if (job != NULL) { |
| 254 | if (FLAG_trace_osr) { |
| 255 | PrintF("[OSR - Found ready: "); |
| 256 | function->PrintName(); |
| 257 | PrintF(" at AST id %d]\n", ast_id.ToInt()); |
| 258 | } |
| 259 | result = Compiler::GetConcurrentlyOptimizedCode(job); |
| 260 | } else if (IsSuitableForOnStackReplacement(isolate, function, caller_code)) { |
| 261 | if (FLAG_trace_osr) { |
| 262 | PrintF("[OSR - Compiling: "); |
| 263 | function->PrintName(); |
| 264 | PrintF(" at AST id %d]\n", ast_id.ToInt()); |
| 265 | } |
| 266 | MaybeHandle<Code> maybe_result = |
| 267 | Compiler::GetOptimizedCode(function, caller_code, mode, ast_id); |
| 268 | if (maybe_result.ToHandle(&result) && |
| 269 | result.is_identical_to(isolate->builtins()->InOptimizationQueue())) { |
| 270 | // Optimization is queued. Return to check later. |
| 271 | return NULL; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | // Revert the patched back edge table, regardless of whether OSR succeeds. |
| 276 | BackEdgeTable::Revert(isolate, *caller_code); |
| 277 | |
| 278 | // Check whether we ended up with usable optimized code. |
| 279 | if (!result.is_null() && result->kind() == Code::OPTIMIZED_FUNCTION) { |
| 280 | DeoptimizationInputData* data = |
| 281 | DeoptimizationInputData::cast(result->deoptimization_data()); |
| 282 | |
| 283 | if (data->OsrPcOffset()->value() >= 0) { |
| 284 | DCHECK(BailoutId(data->OsrAstId()->value()) == ast_id); |
| 285 | if (FLAG_trace_osr) { |
| 286 | PrintF("[OSR - Entry at AST id %d, offset %d in optimized code]\n", |
| 287 | ast_id.ToInt(), data->OsrPcOffset()->value()); |
| 288 | } |
| 289 | // TODO(titzer): this is a massive hack to make the deopt counts |
| 290 | // match. Fix heuristics for reenabling optimizations! |
| 291 | function->shared()->increment_deopt_count(); |
| 292 | |
| 293 | // TODO(titzer): Do not install code into the function. |
| 294 | function->ReplaceCode(*result); |
| 295 | return *result; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | // Failed. |
| 300 | if (FLAG_trace_osr) { |
| 301 | PrintF("[OSR - Failed: "); |
| 302 | function->PrintName(); |
| 303 | PrintF(" at AST id %d]\n", ast_id.ToInt()); |
| 304 | } |
| 305 | |
| 306 | if (!function->IsOptimized()) { |
| 307 | function->ReplaceCode(function->shared()->code()); |
| 308 | } |
| 309 | return NULL; |
| 310 | } |
| 311 | |
| 312 | |
| 313 | RUNTIME_FUNCTION(Runtime_TryInstallOptimizedCode) { |
| 314 | HandleScope scope(isolate); |
| 315 | DCHECK(args.length() == 1); |
| 316 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| 317 | |
| 318 | // First check if this is a real stack overflow. |
| 319 | StackLimitCheck check(isolate); |
| 320 | if (check.JsHasOverflowed()) { |
| 321 | SealHandleScope shs(isolate); |
| 322 | return isolate->StackOverflow(); |
| 323 | } |
| 324 | |
| 325 | isolate->optimizing_compiler_thread()->InstallOptimizedFunctions(); |
| 326 | return (function->IsOptimized()) ? function->code() |
| 327 | : function->shared()->code(); |
| 328 | } |
| 329 | |
| 330 | |
| 331 | bool CodeGenerationFromStringsAllowed(Isolate* isolate, |
| 332 | Handle<Context> context) { |
| 333 | DCHECK(context->allow_code_gen_from_strings()->IsFalse()); |
| 334 | // Check with callback if set. |
| 335 | AllowCodeGenerationFromStringsCallback callback = |
| 336 | isolate->allow_code_gen_callback(); |
| 337 | if (callback == NULL) { |
| 338 | // No callback set and code generation disallowed. |
| 339 | return false; |
| 340 | } else { |
| 341 | // Callback set. Let it decide if code generation is allowed. |
| 342 | VMState<EXTERNAL> state(isolate); |
| 343 | return callback(v8::Utils::ToLocal(context)); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | |
| 348 | RUNTIME_FUNCTION(Runtime_CompileString) { |
| 349 | HandleScope scope(isolate); |
| 350 | DCHECK(args.length() == 3); |
| 351 | CONVERT_ARG_HANDLE_CHECKED(String, source, 0); |
| 352 | CONVERT_BOOLEAN_ARG_CHECKED(function_literal_only, 1); |
| 353 | CONVERT_SMI_ARG_CHECKED(source_offset, 2); |
| 354 | |
| 355 | // Extract native context. |
| 356 | Handle<Context> context(isolate->native_context()); |
| 357 | |
| 358 | // Check if native context allows code generation from |
| 359 | // strings. Throw an exception if it doesn't. |
| 360 | if (context->allow_code_gen_from_strings()->IsFalse() && |
| 361 | !CodeGenerationFromStringsAllowed(isolate, context)) { |
| 362 | Handle<Object> error_message = |
| 363 | context->ErrorMessageForCodeGenerationFromStrings(); |
| 364 | THROW_NEW_ERROR_RETURN_FAILURE( |
| 365 | isolate, NewEvalError("code_gen_from_strings", |
| 366 | HandleVector<Object>(&error_message, 1))); |
| 367 | } |
| 368 | |
| 369 | // Compile source string in the native context. |
| 370 | ParseRestriction restriction = function_literal_only |
| 371 | ? ONLY_SINGLE_FUNCTION_LITERAL |
| 372 | : NO_PARSE_RESTRICTION; |
| 373 | Handle<SharedFunctionInfo> outer_info(context->closure()->shared(), isolate); |
| 374 | Handle<JSFunction> fun; |
| 375 | ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| 376 | isolate, fun, |
| 377 | Compiler::GetFunctionFromEval(source, outer_info, context, SLOPPY, |
| 378 | restriction, RelocInfo::kNoPosition)); |
| 379 | if (function_literal_only) { |
| 380 | // The actual body is wrapped, which shifts line numbers. |
| 381 | Handle<Script> script(Script::cast(fun->shared()->script()), isolate); |
| 382 | if (script->line_offset() == 0) { |
| 383 | int line_num = Script::GetLineNumber(script, source_offset); |
| 384 | script->set_line_offset(Smi::FromInt(-line_num)); |
| 385 | } |
| 386 | } |
| 387 | return *fun; |
| 388 | } |
| 389 | |
| 390 | |
| 391 | static ObjectPair CompileGlobalEval(Isolate* isolate, Handle<String> source, |
| 392 | Handle<SharedFunctionInfo> outer_info, |
| 393 | Handle<Object> receiver, |
| 394 | StrictMode strict_mode, |
| 395 | int scope_position) { |
| 396 | Handle<Context> context = Handle<Context>(isolate->context()); |
| 397 | Handle<Context> native_context = Handle<Context>(context->native_context()); |
| 398 | |
| 399 | // Check if native context allows code generation from |
| 400 | // strings. Throw an exception if it doesn't. |
| 401 | if (native_context->allow_code_gen_from_strings()->IsFalse() && |
| 402 | !CodeGenerationFromStringsAllowed(isolate, native_context)) { |
| 403 | Handle<Object> error_message = |
| 404 | native_context->ErrorMessageForCodeGenerationFromStrings(); |
| 405 | Handle<Object> error; |
| 406 | MaybeHandle<Object> maybe_error = isolate->factory()->NewEvalError( |
| 407 | "code_gen_from_strings", HandleVector<Object>(&error_message, 1)); |
| 408 | if (maybe_error.ToHandle(&error)) isolate->Throw(*error); |
| 409 | return MakePair(isolate->heap()->exception(), NULL); |
| 410 | } |
| 411 | |
| 412 | // Deal with a normal eval call with a string argument. Compile it |
| 413 | // and return the compiled function bound in the local context. |
| 414 | static const ParseRestriction restriction = NO_PARSE_RESTRICTION; |
| 415 | Handle<JSFunction> compiled; |
| 416 | ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| 417 | isolate, compiled, |
| 418 | Compiler::GetFunctionFromEval(source, outer_info, context, strict_mode, |
| 419 | restriction, scope_position), |
| 420 | MakePair(isolate->heap()->exception(), NULL)); |
| 421 | return MakePair(*compiled, *receiver); |
| 422 | } |
| 423 | |
| 424 | |
| 425 | RUNTIME_FUNCTION_RETURN_PAIR(Runtime_ResolvePossiblyDirectEval) { |
| 426 | HandleScope scope(isolate); |
| 427 | DCHECK(args.length() == 6); |
| 428 | |
| 429 | Handle<Object> callee = args.at<Object>(0); |
| 430 | |
| 431 | // If "eval" didn't refer to the original GlobalEval, it's not a |
| 432 | // direct call to eval. |
| 433 | // (And even if it is, but the first argument isn't a string, just let |
| 434 | // execution default to an indirect call to eval, which will also return |
| 435 | // the first argument without doing anything). |
| 436 | if (*callee != isolate->native_context()->global_eval_fun() || |
| 437 | !args[1]->IsString()) { |
| 438 | return MakePair(*callee, isolate->heap()->undefined_value()); |
| 439 | } |
| 440 | |
| 441 | DCHECK(args[4]->IsSmi()); |
| 442 | DCHECK(args.smi_at(4) == SLOPPY || args.smi_at(4) == STRICT); |
| 443 | StrictMode strict_mode = static_cast<StrictMode>(args.smi_at(4)); |
| 444 | DCHECK(args[5]->IsSmi()); |
| 445 | Handle<SharedFunctionInfo> outer_info(args.at<JSFunction>(2)->shared(), |
| 446 | isolate); |
| 447 | return CompileGlobalEval(isolate, args.at<String>(1), outer_info, |
| 448 | args.at<Object>(3), strict_mode, args.smi_at(5)); |
| 449 | } |
| 450 | } |
| 451 | } // namespace v8::internal |