compilation-info.h 12 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_COMPILATION_INFO_H_
#define V8_COMPILATION_INFO_H_

#include <memory>

#include "src/compilation-dependencies.h"
#include "src/frames.h"
#include "src/handles.h"
#include "src/objects.h"
#include "src/source-position-table.h"
#include "src/utils.h"
#include "src/vector.h"

namespace v8 {
namespace internal {

class DeclarationScope;
class DeferredHandles;
class FunctionLiteral;
class JavaScriptFrame;
class ParseInfo;
class Isolate;
class Zone;

// CompilationInfo encapsulates some information known at compile time.  It
// is constructed based on the resources available at compile-time.
class CompilationInfo final {
 public:
  // Various configuration flags for a compilation, as well as some properties
  // of the compiled code produced by a compilation.
  enum Flag {
    kDeferredCalling = 1 << 0,
    kNonDeferredCalling = 1 << 1,
    kSavesCallerDoubles = 1 << 2,
    kRequiresFrame = 1 << 3,
    kMustNotHaveEagerFrame = 1 << 4,
    kDeoptimizationSupport = 1 << 5,
    kDebug = 1 << 6,
    kSerializing = 1 << 7,
    kFunctionContextSpecializing = 1 << 8,
    kFrameSpecializing = 1 << 9,
    kNativeContextSpecializing = 1 << 10,
    kInliningEnabled = 1 << 11,
    kDisableFutureOptimization = 1 << 12,
    kSplittingEnabled = 1 << 13,
    kDeoptimizationEnabled = 1 << 14,
    kSourcePositionsEnabled = 1 << 15,
    kBailoutOnUninitialized = 1 << 16,
    kOptimizeFromBytecode = 1 << 17,
    kTypeFeedbackEnabled = 1 << 18,
    kAccessorInliningEnabled = 1 << 19,
  };

  CompilationInfo(ParseInfo* parse_info, Handle<JSFunction> closure);
  CompilationInfo(Vector<const char> debug_name, Isolate* isolate, Zone* zone,
                  Code::Flags code_flags);
  ~CompilationInfo();

  ParseInfo* parse_info() const { return parse_info_; }

  // -----------------------------------------------------------
  // TODO(titzer): inline and delete accessors of ParseInfo
  // -----------------------------------------------------------
  Handle<Script> script() const;
  FunctionLiteral* literal() const;
  DeclarationScope* scope() const;
  Handle<SharedFunctionInfo> shared_info() const;
  bool has_shared_info() const;
  // -----------------------------------------------------------

  Isolate* isolate() const { return isolate_; }
  Zone* zone() { return zone_; }
  bool is_osr() const { return !osr_ast_id_.IsNone(); }
  Handle<JSFunction> closure() const { return closure_; }
  Handle<Code> code() const { return code_; }
  Code::Flags code_flags() const { return code_flags_; }
  BailoutId osr_ast_id() const { return osr_ast_id_; }
  JavaScriptFrame* osr_frame() const { return osr_frame_; }
  int num_parameters() const;
  int num_parameters_including_this() const;
  bool is_this_defined() const;

  void set_parameter_count(int parameter_count) {
    DCHECK(IsStub());
    parameter_count_ = parameter_count;
  }

  bool has_bytecode_array() const { return !bytecode_array_.is_null(); }
  Handle<BytecodeArray> bytecode_array() const { return bytecode_array_; }

  bool is_tracking_positions() const { return track_positions_; }

  bool is_calling() const {
    return GetFlag(kDeferredCalling) || GetFlag(kNonDeferredCalling);
  }

  void MarkAsDeferredCalling() { SetFlag(kDeferredCalling); }

  bool is_deferred_calling() const { return GetFlag(kDeferredCalling); }

  void MarkAsNonDeferredCalling() { SetFlag(kNonDeferredCalling); }

  bool is_non_deferred_calling() const { return GetFlag(kNonDeferredCalling); }

  void MarkAsSavesCallerDoubles() { SetFlag(kSavesCallerDoubles); }

  bool saves_caller_doubles() const { return GetFlag(kSavesCallerDoubles); }

  void MarkAsRequiresFrame() { SetFlag(kRequiresFrame); }

  bool requires_frame() const { return GetFlag(kRequiresFrame); }

  void MarkMustNotHaveEagerFrame() { SetFlag(kMustNotHaveEagerFrame); }

  bool GetMustNotHaveEagerFrame() const {
    return GetFlag(kMustNotHaveEagerFrame);
  }

  // Compiles marked as debug produce unoptimized code with debug break slots.
  // Inner functions that cannot be compiled w/o context are compiled eagerly.
  // Always include deoptimization support to avoid having to recompile again.
  void MarkAsDebug() {
    SetFlag(kDebug);
    SetFlag(kDeoptimizationSupport);
  }

  bool is_debug() const { return GetFlag(kDebug); }

  void PrepareForSerializing() { SetFlag(kSerializing); }

  bool will_serialize() const { return GetFlag(kSerializing); }

  void MarkAsFunctionContextSpecializing() {
    SetFlag(kFunctionContextSpecializing);
  }

  bool is_function_context_specializing() const {
    return GetFlag(kFunctionContextSpecializing);
  }

  void MarkAsFrameSpecializing() { SetFlag(kFrameSpecializing); }

  bool is_frame_specializing() const { return GetFlag(kFrameSpecializing); }

  void MarkAsNativeContextSpecializing() {
    SetFlag(kNativeContextSpecializing);
  }

  bool is_native_context_specializing() const {
    return GetFlag(kNativeContextSpecializing);
  }

  void MarkAsDeoptimizationEnabled() { SetFlag(kDeoptimizationEnabled); }

  bool is_deoptimization_enabled() const {
    return GetFlag(kDeoptimizationEnabled);
  }

  void MarkAsTypeFeedbackEnabled() { SetFlag(kTypeFeedbackEnabled); }

  bool is_type_feedback_enabled() const {
    return GetFlag(kTypeFeedbackEnabled);
  }

  void MarkAsAccessorInliningEnabled() { SetFlag(kAccessorInliningEnabled); }

  bool is_accessor_inlining_enabled() const {
    return GetFlag(kAccessorInliningEnabled);
  }

  void MarkAsSourcePositionsEnabled() { SetFlag(kSourcePositionsEnabled); }

  bool is_source_positions_enabled() const {
    return GetFlag(kSourcePositionsEnabled);
  }

  void MarkAsInliningEnabled() { SetFlag(kInliningEnabled); }

  bool is_inlining_enabled() const { return GetFlag(kInliningEnabled); }

  void MarkAsSplittingEnabled() { SetFlag(kSplittingEnabled); }

  bool is_splitting_enabled() const { return GetFlag(kSplittingEnabled); }

  void MarkAsBailoutOnUninitialized() { SetFlag(kBailoutOnUninitialized); }

  bool is_bailout_on_uninitialized() const {
    return GetFlag(kBailoutOnUninitialized);
  }

  void MarkAsOptimizeFromBytecode() { SetFlag(kOptimizeFromBytecode); }

  bool is_optimizing_from_bytecode() const {
    return GetFlag(kOptimizeFromBytecode);
  }

  bool GeneratePreagedPrologue() const {
    // Generate a pre-aged prologue if we are optimizing for size, which
    // will make code flushing more aggressive. Only apply to Code::FUNCTION,
    // since StaticMarkingVisitor::IsFlushable only flushes proper functions.
    return FLAG_optimize_for_size && FLAG_age_code && !is_debug() &&
           output_code_kind() == Code::FUNCTION;
  }

  void SetCode(Handle<Code> code) { code_ = code; }

  void SetBytecodeArray(Handle<BytecodeArray> bytecode_array) {
    bytecode_array_ = bytecode_array;
  }

  bool ShouldTrapOnDeopt() const {
    return (FLAG_trap_on_deopt && IsOptimizing()) ||
           (FLAG_trap_on_stub_deopt && IsStub());
  }

220 221 222
  bool has_context() const;
  Context* context() const;

223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404
  bool has_native_context() const;
  Context* native_context() const;

  bool has_global_object() const;
  JSGlobalObject* global_object() const;

  // Accessors for the different compilation modes.
  bool IsOptimizing() const { return mode_ == OPTIMIZE; }
  bool IsStub() const { return mode_ == STUB; }
  void SetOptimizing();
  void SetOptimizingForOsr(BailoutId osr_ast_id, JavaScriptFrame* osr_frame) {
    SetOptimizing();
    osr_ast_id_ = osr_ast_id;
    osr_frame_ = osr_frame;
  }

  // Deoptimization support.
  bool HasDeoptimizationSupport() const {
    return GetFlag(kDeoptimizationSupport);
  }
  void EnableDeoptimizationSupport() {
    DCHECK_EQ(BASE, mode_);
    SetFlag(kDeoptimizationSupport);
  }
  bool ShouldEnsureSpaceForLazyDeopt() { return !IsStub(); }

  bool ExpectsJSReceiverAsReceiver();

  // Determines whether or not to insert a self-optimization header.
  bool ShouldSelfOptimize();

  void set_deferred_handles(DeferredHandles* deferred_handles) {
    DCHECK(deferred_handles_ == NULL);
    deferred_handles_ = deferred_handles;
  }

  void ReopenHandlesInNewHandleScope();

  void AbortOptimization(BailoutReason reason) {
    DCHECK(reason != kNoReason);
    if (bailout_reason_ == kNoReason) bailout_reason_ = reason;
    SetFlag(kDisableFutureOptimization);
  }

  void RetryOptimization(BailoutReason reason) {
    DCHECK(reason != kNoReason);
    if (GetFlag(kDisableFutureOptimization)) return;
    bailout_reason_ = reason;
  }

  BailoutReason bailout_reason() const { return bailout_reason_; }

  int prologue_offset() const {
    DCHECK_NE(Code::kPrologueOffsetNotSet, prologue_offset_);
    return prologue_offset_;
  }

  void set_prologue_offset(int prologue_offset) {
    DCHECK_EQ(Code::kPrologueOffsetNotSet, prologue_offset_);
    prologue_offset_ = prologue_offset;
  }

  CompilationDependencies* dependencies() { return &dependencies_; }

  int optimization_id() const { return optimization_id_; }

  int osr_expr_stack_height() { return osr_expr_stack_height_; }
  void set_osr_expr_stack_height(int height) {
    DCHECK(height >= 0);
    osr_expr_stack_height_ = height;
  }

  bool has_simple_parameters();

  struct InlinedFunctionHolder {
    Handle<SharedFunctionInfo> shared_info;

    // Root that holds the unoptimized code of the inlined function alive
    // (and out of reach of code flushing) until we finish compilation.
    // Do not remove.
    Handle<Code> inlined_code_object_root;

    InlinedFunctionHolder(Handle<SharedFunctionInfo> inlined_shared_info,
                          Handle<Code> inlined_code_object_root)
        : shared_info(inlined_shared_info),
          inlined_code_object_root(inlined_code_object_root) {}
  };

  typedef std::vector<InlinedFunctionHolder> InlinedFunctionList;
  InlinedFunctionList const& inlined_functions() const {
    return inlined_functions_;
  }

  void AddInlinedFunction(Handle<SharedFunctionInfo> inlined_function);

  std::unique_ptr<char[]> GetDebugName() const;

  Code::Kind output_code_kind() const;

  StackFrame::Type GetOutputStackFrameType() const;

  int GetDeclareGlobalsFlags() const;

  SourcePositionTableBuilder::RecordingMode SourcePositionRecordingMode() const;

 private:
  // Compilation mode.
  // BASE is generated by the full codegen, optionally prepared for bailouts.
  // OPTIMIZE is optimized code generated by the Hydrogen-based backend.
  enum Mode { BASE, OPTIMIZE, STUB };

  CompilationInfo(ParseInfo* parse_info, Vector<const char> debug_name,
                  Code::Flags code_flags, Mode mode, Isolate* isolate,
                  Zone* zone);

  ParseInfo* parse_info_;
  Isolate* isolate_;

  void SetMode(Mode mode) { mode_ = mode; }

  void SetFlag(Flag flag) { flags_ |= flag; }

  void SetFlag(Flag flag, bool value) {
    flags_ = value ? flags_ | flag : flags_ & ~flag;
  }

  bool GetFlag(Flag flag) const { return (flags_ & flag) != 0; }

  unsigned flags_;

  Code::Flags code_flags_;

  Handle<JSFunction> closure_;

  // The compiled code.
  Handle<Code> code_;

  // Compilation mode flag and whether deoptimization is allowed.
  Mode mode_;
  BailoutId osr_ast_id_;

  // Holds the bytecode array generated by the interpreter.
  // TODO(rmcilroy/mstarzinger): Temporary work-around until compiler.cc is
  // refactored to avoid us needing to carry the BytcodeArray around.
  Handle<BytecodeArray> bytecode_array_;

  // The zone from which the compilation pipeline working on this
  // CompilationInfo allocates.
  Zone* zone_;

  DeferredHandles* deferred_handles_;

  // Dependencies for this compilation, e.g. stable maps.
  CompilationDependencies dependencies_;

  BailoutReason bailout_reason_;

  int prologue_offset_;

  bool track_positions_;

  InlinedFunctionList inlined_functions_;

  // Number of parameters used for compilation of stubs that require arguments.
  int parameter_count_;

  int optimization_id_;

  int osr_expr_stack_height_;

  // The current OSR frame for specialization or {nullptr}.
  JavaScriptFrame* osr_frame_ = nullptr;

  Vector<const char> debug_name_;

  DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
};

}  // namespace internal
}  // namespace v8

#endif  // V8_COMPILATION_INFO_H_