dart::Compiler Class Reference

#include <compiler.h>

Inheritance diagram for dart::Compiler:

Static Public Member Functions
static bool	IsBackgroundCompilation ()
static bool	CanOptimizeFunction (Thread *thread, const Function &function)
static ObjectPtr	CompileFunction (Thread *thread, const Function &function)
static ErrorPtr	EnsureUnoptimizedCode (Thread *thread, const Function &function)
static ObjectPtr	CompileOptimizedFunction (Thread *thread, const Function &function, intptr_t osr_id=kNoOSRDeoptId)
static void	ComputeLocalVarDescriptors (const Code &code)
static ErrorPtr	CompileAllFunctions (const Class &cls)
static void	AbortBackgroundCompilation (intptr_t deopt_id, const char *msg)

Static Public Attributes
static constexpr intptr_t	kNoOSRDeoptId = DeoptId::kNone

Detailed Description

Definition at line 71 of file compiler.h.

Member Function Documentation

AbortBackgroundCompilation()

void dart::Compiler::AbortBackgroundCompilation ( intptr_t  deopt_id, const char *  msg  )

static

Definition at line 972 of file compiler.cc.

                                                                            {
  if (FLAG_trace_compiler) {
    THR_Print("ABORT background compilation: %s\n", msg);
  }
#if !defined(PRODUCT)
  TimelineStream* stream = Timeline::GetCompilerStream();
  ASSERT(stream != nullptr);
  TimelineEvent* event = stream->StartEvent();
  if (event != nullptr) {
    event->Instant("AbortBackgroundCompilation");
    event->SetNumArguments(1);
    event->CopyArgument(0, "reason", msg);
    event->Complete();
  }
#endif  // !defined(PRODUCT)
  ASSERT(Compiler::IsBackgroundCompilation());
  Thread::Current()->long_jump_base()->Jump(
      deopt_id, Object::background_compilation_error());
}

CanOptimizeFunction()

bool dart::Compiler::CanOptimizeFunction ( Thread *  thread, const Function &  function  )

static

Definition at line 230 of file compiler.cc.

                                                                           {
#if !defined(PRODUCT)
  if (thread->isolate_group()->debugger()->IsDebugging(thread, function)) {
    // We cannot set breakpoints and single step in optimized code,
    // so do not optimize the function. Bump usage counter down to avoid
    // repeatedly entering the runtime for an optimization attempt.
    function.SetUsageCounter(0);
 
    // If the optimization counter = 1, the unoptimized code will come back here
    // immediately, causing an infinite compilation loop. The compiler raises
    // the threshold for functions with breakpoints, so we drop the unoptimized
    // to force it to be recompiled.
    if (thread->isolate_group()->optimization_counter_threshold() < 2) {
      function.ClearCode();
    }
    return false;
  }
#endif
  if (function.deoptimization_counter() >=
      FLAG_max_deoptimization_counter_threshold) {
    if (FLAG_trace_failed_optimization_attempts ||
        FLAG_stop_on_excessive_deoptimization) {
      THR_Print("Too many deoptimizations: %s\n",
                function.ToFullyQualifiedCString());
      if (FLAG_stop_on_excessive_deoptimization) {
        FATAL("Stop on excessive deoptimization");
      }
    }
    // The function will not be optimized any longer. This situation can occur
    // mostly with small optimization counter thresholds.
    function.SetIsOptimizable(false);
    function.SetUsageCounter(INT32_MIN);
    return false;
  }
  if (FLAG_optimization_filter != nullptr) {
    // FLAG_optimization_filter is a comma-separated list of strings that are
    // matched against the fully-qualified function name.
    char* save_ptr;  // Needed for strtok_r.
    const char* function_name = function.ToFullyQualifiedCString();
    intptr_t len = strlen(FLAG_optimization_filter) + 1;  // Length with \0.
    char* filter = new char[len];
    strncpy(filter, FLAG_optimization_filter, len);  // strtok modifies arg 1.
    char* token = strtok_r(filter, ",", &save_ptr);
    bool found = false;
    while (token != nullptr) {
      if (strstr(function_name, token) != nullptr) {
        found = true;
        break;
      }
      token = strtok_r(nullptr, ",", &save_ptr);
    }
    delete[] filter;
    if (!found) {
      function.SetUsageCounter(INT32_MIN);
      return false;
    }
  }
  if (!function.IsOptimizable()) {
    // Huge methods (code size above --huge_method_cutoff_in_code_size) become
    // non-optimizable only after the code has been generated.
    if (FLAG_trace_failed_optimization_attempts) {
      THR_Print("Not optimizable: %s\n", function.ToFullyQualifiedCString());
    }
    function.SetUsageCounter(INT32_MIN);
    return false;
  }
  return true;
}

CompileAllFunctions()

ErrorPtr dart::Compiler::CompileAllFunctions ( const Class &  cls )

static

Definition at line 949 of file compiler.cc.

                                                       {
  Thread* thread = Thread::Current();
  Zone* zone = thread->zone();
  Object& result = Object::Handle(zone);
  // We don't expect functions() to change as the class was finalized.
  ASSERT(cls.is_finalized());
  Array& functions = Array::Handle(zone, cls.current_functions());
  Function& func = Function::Handle(zone);
  // Compile all the regular functions.
  for (int i = 0; i < functions.Length(); i++) {
    func ^= functions.At(i);
    ASSERT(!func.IsNull());
    if (!func.HasCode() && !func.is_abstract()) {
      result = CompileFunction(thread, func);
      if (result.IsError()) {
        return Error::Cast(result).ptr();
      }
      ASSERT(!result.IsNull());
    }
  }
  return Error::null();
}

CompileFunction()

ObjectPtr dart::Compiler::CompileFunction ( Thread *  thread, const Function &  function  )

static

Definition at line 825 of file compiler.cc.

                                                                            {
#if defined(DART_PRECOMPILER) && !defined(TARGET_ARCH_IA32)
  RELEASE_ASSERT(!FLAG_precompiled_mode);
#endif
 
#if defined(DART_PRECOMPILED_RUNTIME)
  FATAL("Precompilation missed function %s (%s, %s)\n",
        function.ToLibNamePrefixedQualifiedCString(),
        function.token_pos().ToCString(),
        Function::KindToCString(function.kind()));
#endif  // defined(DART_PRECOMPILED_RUNTIME)
 
  VMTagScope tagScope(thread, VMTag::kCompileUnoptimizedTagId);
#if defined(SUPPORT_TIMELINE)
  const char* event_name;
  if (IsBackgroundCompilation()) {
    event_name = "CompileFunctionUnoptimizedBackground";
  } else {
    event_name = "CompileFunction";
  }
  TIMELINE_FUNCTION_COMPILATION_DURATION(thread, event_name, function);
#endif  // defined(SUPPORT_TIMELINE)
 
  CompilationPipeline* pipeline =
      CompilationPipeline::New(thread->zone(), function);
 
  const bool optimized = function.ForceOptimize();
  return CompileFunctionHelper(pipeline, function, optimized, kNoOSRDeoptId);
}

CompileOptimizedFunction()

ObjectPtr dart::Compiler::CompileOptimizedFunction ( Thread *  thread, const Function &  function, intptr_t  osr_id = kNoOSRDeoptId  )

static

Definition at line 887 of file compiler.cc.

                                                              {
  VMTagScope tag_scope(thread, VMTag::kCompileOptimizedTagId);
 
#if defined(SUPPORT_TIMELINE)
  const char* event_name;
  if (osr_id != kNoOSRDeoptId) {
    event_name = "CompileFunctionOptimizedOSR";
  } else if (IsBackgroundCompilation()) {
    event_name = "CompileFunctionOptimizedBackground";
  } else {
    event_name = "CompileFunctionOptimized";
  }
  TIMELINE_FUNCTION_COMPILATION_DURATION(thread, event_name, function);
#endif  // defined(SUPPORT_TIMELINE)
 
  CompilationPipeline* pipeline =
      CompilationPipeline::New(thread->zone(), function);
  return CompileFunctionHelper(pipeline, function, /* optimized = */ true,
                               osr_id);
}

ComputeLocalVarDescriptors()

void dart::Compiler::ComputeLocalVarDescriptors ( const Code &  code )

static

Definition at line 910 of file compiler.cc.

                                                          {
  ASSERT(!code.is_optimized());
  ASSERT(!FLAG_precompiled_mode);
  const Function& function = Function::Handle(code.function());
  ASSERT(code.var_descriptors() == Object::null());
  // IsIrregexpFunction have eager var descriptors generation.
  ASSERT(!function.IsIrregexpFunction());
  // In background compilation, parser can produce 'errors": bailouts
  // if state changed while compiling in background.
  Thread* thread = Thread::Current();
  Zone* zone = thread->zone();
  CompilerState state(thread, /*is_aot=*/false, /*is_optimizing=*/false);
  LongJumpScope jump;
  if (setjmp(*jump.Set()) == 0) {
    ParsedFunction* parsed_function =
        new ParsedFunction(thread, Function::ZoneHandle(zone, function.ptr()));
    ZoneGrowableArray<const ICData*>* ic_data_array =
        new ZoneGrowableArray<const ICData*>();
    ZoneGrowableArray<intptr_t>* context_level_array =
        new ZoneGrowableArray<intptr_t>();
 
    kernel::FlowGraphBuilder builder(
        parsed_function, ic_data_array, context_level_array,
        /* not inlining */ nullptr, false, Compiler::kNoOSRDeoptId);
    builder.BuildGraph();
 
    auto& var_descs = LocalVarDescriptors::Handle(zone);
 
    var_descs = parsed_function->scope()->GetVarDescriptors(
        function, context_level_array);
 
    ASSERT(!var_descs.IsNull());
    code.set_var_descriptors(var_descs);
  } else {
    // Only possible with background compilation.
    ASSERT(Compiler::IsBackgroundCompilation());
  }
}

EnsureUnoptimizedCode()

ErrorPtr dart::Compiler::EnsureUnoptimizedCode ( Thread *  thread, const Function &  function  )

static

Definition at line 855 of file compiler.cc.

                                                                   {
  ASSERT(!function.ForceOptimize());
  if (function.unoptimized_code() != Object::null()) {
    return Error::null();
  }
  Code& original_code = Code::ZoneHandle(thread->zone());
  if (function.HasCode()) {
    original_code = function.CurrentCode();
  }
  CompilationPipeline* pipeline =
      CompilationPipeline::New(thread->zone(), function);
  const Object& result = Object::Handle(
      CompileFunctionHelper(pipeline, function, false, /* not optimized */
                            kNoOSRDeoptId));
  if (result.IsError()) {
    return Error::Cast(result).ptr();
  }
  // Since CompileFunctionHelper replaces the current code, re-attach the
  // the original code if the function was already compiled.
  if (!original_code.IsNull() && result.ptr() == function.CurrentCode() &&
      !original_code.IsDisabled()) {
    function.AttachCode(original_code);
  }
  ASSERT(function.unoptimized_code() != Object::null());
  ASSERT(function.unoptimized_code() == result.ptr());
  if (FLAG_trace_compiler) {
    THR_Print("Ensure unoptimized code for %s\n", function.ToCString());
  }
  return Error::null();
}

IsBackgroundCompilation()

bool dart::Compiler::IsBackgroundCompilation ( )

static

Definition at line 299 of file compiler.cc.

                                       {
  // For now: compilation in non mutator thread is the background compilation.
  return !Thread::Current()->IsDartMutatorThread();
}

Member Data Documentation

kNoOSRDeoptId

constexpr intptr_t dart::Compiler::kNoOSRDeoptId = DeoptId::kNone

staticconstexpr

Definition at line 73 of file compiler.h.

---

The documentation for this class was generated from the following files:

• third_party/dart-lang/sdk/runtime/vm/compiler/jit/compiler.h
• third_party/dart-lang/sdk/runtime/vm/compiler/jit/compiler.cc