dart::LocalVarDescriptorsBuilder Class Reference

#include <scopes.h>

Inheritance diagram for dart::LocalVarDescriptorsBuilder:

Classes
struct	VarDesc

Public Member Functions
	LocalVarDescriptorsBuilder ()
void	Add (const VarDesc &var_desc)
void	AddAll (Zone *zone, const LocalVarDescriptors &var_descs)
void	AddDeoptIdToContextLevelMappings (ZoneGrowableArray< intptr_t > *context_level_array)
LocalVarDescriptorsPtr	Done ()
Public Member Functions inherited from dart::ValueObject
	ValueObject ()
	~ValueObject ()

Detailed Description

Definition at line 287 of file scopes.h.

Constructor & Destructor Documentation

LocalVarDescriptorsBuilder()

dart::LocalVarDescriptorsBuilder::LocalVarDescriptorsBuilder ( )

inline

Definition at line 294 of file scopes.h.

: vars_(8) {}

Member Function Documentation

Add()

void dart::LocalVarDescriptorsBuilder::Add ( const VarDesc &  var_desc )

inline

Definition at line 297 of file scopes.h.

{ vars_.Add(var_desc); }

AddAll()

void dart::LocalVarDescriptorsBuilder::AddAll	(	Zone *	zone,
		const LocalVarDescriptors &	var_descs
	)

Definition at line 631 of file scopes.cc.

                                                                              {
  for (intptr_t i = 0, n = var_descs.Length(); i < n; ++i) {
    VarDesc desc;
    desc.name = &String::Handle(zone, var_descs.GetName(i));
    var_descs.GetInfo(i, &desc.info);
    Add(desc);
  }
}

AddDeoptIdToContextLevelMappings()

void dart::LocalVarDescriptorsBuilder::AddDeoptIdToContextLevelMappings

(

ZoneGrowableArray< intptr_t > *

context_level_array

)

Definition at line 641 of file scopes.cc.

                                                      {
  // Record deopt-id -> context-level mappings, using ranges of deopt-ids with
  // the same context-level. [context_level_array] contains (deopt_id,
  // context_level) tuples.
  for (intptr_t start = 0; start < context_level_array->length();) {
    intptr_t start_deopt_id = (*context_level_array)[start];
    intptr_t start_context_level = (*context_level_array)[start + 1];
    intptr_t end = start;
    intptr_t end_deopt_id = start_deopt_id;
    for (intptr_t peek = start + 2; peek < context_level_array->length();
         peek += 2) {
      intptr_t peek_deopt_id = (*context_level_array)[peek];
      intptr_t peek_context_level = (*context_level_array)[peek + 1];
      // The range encoding assumes the tuples have ascending deopt_ids.
      ASSERT(peek_deopt_id > end_deopt_id);
      if (peek_context_level != start_context_level) break;
      end = peek;
      end_deopt_id = peek_deopt_id;
    }
 
    VarDesc desc;
    desc.name = &Symbols::Empty();  // No name.
    desc.info.set_kind(UntaggedLocalVarDescriptors::kContextLevel);
    desc.info.scope_id = 0;
    // We repurpose the token position fields to store deopt IDs in this case.
    desc.info.begin_pos = TokenPosition::Deserialize(start_deopt_id);
    desc.info.end_pos = TokenPosition::Deserialize(end_deopt_id);
    desc.info.set_index(start_context_level);
    Add(desc);
 
    start = end + 2;
  }
}

Done()

LocalVarDescriptorsPtr dart::LocalVarDescriptorsBuilder::Done

(

)

Definition at line 676 of file scopes.cc.

                                                        {
  if (vars_.is_empty()) {
    return Object::empty_var_descriptors().ptr();
  }
  const LocalVarDescriptors& var_desc =
      LocalVarDescriptors::Handle(LocalVarDescriptors::New(vars_.length()));
  for (int i = 0; i < vars_.length(); i++) {
    var_desc.SetVar(i, *(vars_[i].name), &vars_[i].info);
  }
  return var_desc.ptr();
}

---

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

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