dart::CompileParsedFunctionHelper Class Reference

Inheritance diagram for dart::CompileParsedFunctionHelper:

Public Member Functions
	CompileParsedFunctionHelper (ParsedFunction *parsed_function, bool optimized, intptr_t osr_id)
CodePtr	Compile (CompilationPipeline *pipeline)
Public Member Functions inherited from dart::ValueObject
	ValueObject ()
	~ValueObject ()

Detailed Description

Definition at line 304 of file compiler.cc.

Constructor & Destructor Documentation

CompileParsedFunctionHelper()

dart::CompileParsedFunctionHelper::CompileParsedFunctionHelper ( ParsedFunction *  parsed_function, bool  optimized, intptr_t  osr_id  )

inline

Definition at line 306 of file compiler.cc.

      : parsed_function_(parsed_function),
        optimized_(optimized),
        osr_id_(osr_id),
        thread_(Thread::Current()) {}

Member Function Documentation

Compile()

CodePtr dart::CompileParsedFunctionHelper::Compile

(

CompilationPipeline *

pipeline

)

Definition at line 488 of file compiler.cc.

                                                                          {
  ASSERT(!FLAG_precompiled_mode);
  const Function& function = parsed_function()->function();
  if (optimized() && !function.IsOptimizable()) {
    return Code::null();
  }
  Zone* const zone = thread()->zone();
  HANDLESCOPE(thread());
  EnterCompilerScope cs(thread());
 
  // We may reattempt compilation if the function needs to be assembled using
  // far branches on ARM. In the else branch of the setjmp call, done is set to
  // false, and use_far_branches is set to true if there is a longjmp from the
  // ARM assembler. In all other paths through this while loop, done is set to
  // true. use_far_branches is always false on ia32 and x64.
  volatile bool done = false;
  // volatile because the variable may be clobbered by a longjmp.
  volatile intptr_t far_branch_level = 0;
 
  // In the JIT case we allow speculative inlining and have no need for a
  // suppression, since we don't restart optimization.
  SpeculativeInliningPolicy speculative_policy(/*enable_suppression=*/false);
 
  Code* volatile result = &Code::ZoneHandle(zone);
  while (!done) {
    *result = Code::null();
    LongJumpScope jump;
    if (setjmp(*jump.Set()) == 0) {
      FlowGraph* flow_graph = nullptr;
      ZoneGrowableArray<const ICData*>* ic_data_array = nullptr;
 
      CompilerState compiler_state(thread(), /*is_aot=*/false, optimized(),
                                   CompilerState::ShouldTrace(function));
      compiler_state.set_function(function);
 
      {
        // Extract type feedback before the graph is built, as the graph
        // builder uses it to attach it to nodes.
        ic_data_array = new (zone) ZoneGrowableArray<const ICData*>();
 
        // Clone ICData for background compilation so that it does not
        // change while compiling.
        const bool clone_ic_data = Compiler::IsBackgroundCompilation();
        function.RestoreICDataMap(ic_data_array, clone_ic_data);
 
        if (optimized()) {
          ASSERT(function.ic_data_array() != Array::null() ||
                 function.ForceOptimize());
        }
 
        if (FLAG_print_ic_data_map) {
          for (intptr_t i = 0; i < ic_data_array->length(); i++) {
            if ((*ic_data_array)[i] != nullptr) {
              THR_Print("%" Pd " ", i);
              FlowGraphPrinter::PrintICData(*(*ic_data_array)[i]);
            }
          }
        }
 
        TIMELINE_DURATION(thread(), CompilerVerbose, "BuildFlowGraph");
        flow_graph = pipeline->BuildFlowGraph(
            zone, parsed_function(), ic_data_array, osr_id(), optimized());
      }
 
      const bool print_flow_graph =
          (FLAG_print_flow_graph ||
           (optimized() && FLAG_print_flow_graph_optimized)) &&
          FlowGraphPrinter::ShouldPrint(function);
 
      if (print_flow_graph && !optimized()) {
        FlowGraphPrinter::PrintGraph("Unoptimized Compilation", flow_graph);
      }
 
      if (flow_graph->should_reorder_blocks()) {
        TIMELINE_DURATION(thread(), CompilerVerbose,
                          "BlockScheduler::AssignEdgeWeights");
        BlockScheduler::AssignEdgeWeights(flow_graph);
      }
 
      CompilerPassState pass_state(thread(), flow_graph, &speculative_policy);
 
      if (optimized()) {
        TIMELINE_DURATION(thread(), CompilerVerbose, "OptimizationPasses");
 
        JitCallSpecializer call_specializer(flow_graph, &speculative_policy);
        pass_state.call_specializer = &call_specializer;
 
        flow_graph = CompilerPass::RunPipeline(CompilerPass::kJIT, &pass_state);
      }
 
      ASSERT(pass_state.inline_id_to_function.length() ==
             pass_state.caller_inline_id.length());
      compiler::ObjectPoolBuilder object_pool_builder;
      compiler::Assembler assembler(&object_pool_builder, far_branch_level);
      FlowGraphCompiler graph_compiler(
          &assembler, flow_graph, *parsed_function(), optimized(),
          &speculative_policy, pass_state.inline_id_to_function,
          pass_state.inline_id_to_token_pos, pass_state.caller_inline_id,
          ic_data_array);
      pass_state.graph_compiler = &graph_compiler;
      CompilerPass::GenerateCode(&pass_state);
 
      {
        TIMELINE_DURATION(thread(), CompilerVerbose, "FinalizeCompilation");
 
        auto install_code_fun = [&]() {
          *result =
              FinalizeCompilation(&assembler, &graph_compiler, flow_graph);
#if !defined(PRODUCT)
          // Isolate debuggers need to be notified of compiled function right
          // away as code is installed because there might be latent breakpoints
          // in compiled function, which have to be activated before functions
          // code is executed. Otherwise concurrently running isolates might
          // execute code before its patched and miss a need to pause at a
          // breakpoint.
          if (!result->IsNull()) {
            if (!function.HasOptimizedCode()) {
              thread()->isolate_group()->debugger()->NotifyCompilation(
                  function);
            }
          }
#endif
        };
 
        // Grab write program_lock outside of potential safepoint, that lock
        // can't be waited for inside the safepoint.
        // Initially read lock was added to guard direct_subclasses field
        // access.
        // Read lock was upgraded to write lock to guard dependent code updates.
        SafepointWriteRwLocker ml(thread(),
                                  thread()->isolate_group()->program_lock());
        // We have to ensure no mutators are running, because:
        //
        //   a) We allocate an instructions object, which might cause us to
        //      temporarily flip page protections (RX -> RW -> RX).
        //
        //   b) We have to ensure the code generated does not violate
        //      assumptions (e.g. CHA, field guards), the validation has to
        //      happen while mutator is stopped.
        //
        //   b) We update the [Function] object with a new [Code] which
        //      requires updating several pointers: We have to ensure all of
        //      those writes are observed atomically.
        //
        thread()->isolate_group()->RunWithStoppedMutators(
            install_code_fun, /*use_force_growth=*/true);
      }
      if (!result->IsNull()) {
        // Must be called outside of safepoint.
        Code::NotifyCodeObservers(function, *result, optimized());
 
        if (FLAG_disassemble && FlowGraphPrinter::ShouldPrint(function)) {
          Disassembler::DisassembleCode(function, *result, optimized());
        } else if (FLAG_disassemble_optimized && optimized() &&
                   FlowGraphPrinter::ShouldPrint(function)) {
          Disassembler::DisassembleCode(function, *result, true);
        }
      }
      // Exit the loop and the function with the correct result value.
      done = true;
    } else {
      // We bailed out or we encountered an error.
      const Error& error = Error::Handle(thread()->StealStickyError());
 
      if (error.ptr() == Object::branch_offset_error().ptr()) {
        // Compilation failed due to an out of range branch offset in the
        // assembler. We try again (done = false) with far branches enabled.
        done = false;
        RELEASE_ASSERT(far_branch_level < 2);
        far_branch_level++;
      } else if (error.ptr() == Object::speculative_inlining_error().ptr()) {
        // Can only happen with precompilation.
        UNREACHABLE();
      } else {
        // If the error isn't due to an out of range branch offset, we don't
        // try again (done = true).
        if (FLAG_trace_bailout) {
          THR_Print("%s\n", error.ToErrorCString());
        }
        if (!Compiler::IsBackgroundCompilation() && error.IsLanguageError() &&
            (LanguageError::Cast(error).kind() == Report::kBailout)) {
          // If is is not a background compilation, discard the error if it was
          // not a real error, but just a bailout. If we're it a background
          // compilation this will be dealt with in the caller.
        } else {
          // Otherwise, continue propagating unless we will try again.
          thread()->set_sticky_error(error);
        }
        done = true;
      }
    }
  }
  return result->ptr();
}

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

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