Class: AdLint::Cc1::StatementInterpreter

Inherits:
SubInterpreter show all
Includes:
BranchGroupOptions, BranchOptions, SyntaxNodeCollector
Defined in:
lib/adlint/cc1/interp.rb

Constant Summary

Constants included from BranchGroupOptions

BranchGroupOptions::COMPLETE, BranchGroupOptions::ITERATION

Constants included from BranchOptions

BranchOptions::COMPLEMENTAL, BranchOptions::FINAL, BranchOptions::FIRST, BranchOptions::IMPLICIT_COND, BranchOptions::NARROWING, BranchOptions::SMOTHER_BREAK, BranchOptions::WIDENING

Constants included from InterpreterOptions

InterpreterOptions::QUIET, InterpreterOptions::WITHOUT_SIDE_EFFECTS

Instance Attribute Summary

Attributes inherited from SubInterpreter

#target_node_class

Instance Method Summary collapse

Methods included from SyntaxNodeCollector

collect_additive_expressions, collect_array_declarators, collect_compound_assignment_expressions, collect_constant_specifiers, collect_equality_expressions, collect_function_declarators, collect_generic_labeled_statements, collect_goto_statements, collect_identifier_declarators, collect_if_else_statements, collect_if_statements, collect_logical_and_expressions, collect_logical_or_expressions, collect_object_specifiers, collect_postfix_decrement_expressions, collect_postfix_increment_expressions, collect_prefix_decrement_expressions, collect_prefix_increment_expressions, collect_relational_expressions, collect_simple_assignment_expressions, collect_typedef_type_specifiers

Methods included from LogUtil

#log_debug, #log_error, #log_fatal, #log_info, #log_warn

Methods included from MonitorUtil

#checkpoint, #monitored_region

Methods included from Conversion

#do_conversion, #do_default_argument_promotion, #do_integer_promotion, #do_usual_arithmetic_conversion, #untyped_pointer_conversion?

Methods included from InterpreterMediator

#constant_expression?, #current_branch, #interpret, #object_to_pointer, #object_to_variable, #pointer_value_of, #reset_environment, #scalar_value_of, #scalar_value_of_arbitrary, #scalar_value_of_false, #scalar_value_of_null, #scalar_value_of_true, #value_of

Methods included from InterpSyntaxBridge

#_interp_syntax_bridge_

Methods included from InterpObjectBridge

#_interp_object_bridge_

Methods included from ArithmeticAccessor

#arithmetic, #logical_right_shift?

Methods included from FunctionTableMediator

#declare_explicit_function, #declare_implicit_function, #define_anonymous_function, #define_explicit_function

Methods included from VariableTableMediator

#create_tmpvar, #local_variables

Methods included from MemoryPoolMediator

#pointee_of

Methods inherited from SyntaxTreeVisitor

#visit_abbreviated_function_declarator, #visit_additive_expression, #visit_address_expression, #visit_alignof_expression, #visit_alignof_type_expression, #visit_and_expression, #visit_ansi_function_declarator, #visit_ansi_function_definition, #visit_array_abstract_declarator, #visit_array_declarator, #visit_array_subscript_expression, #visit_bit_access_by_pointer_expression, #visit_bit_access_by_value_expression, #visit_cast_expression, #visit_comma_separated_expression, #visit_compound_assignment_expression, #visit_compound_literal_expression, #visit_conditional_expression, #visit_constant_specifier, #visit_declaration, #visit_declaration_specifiers, #visit_enum_specifier, #visit_enum_type_declaration, #visit_enumerator, #visit_equality_expression, #visit_error_expression, #visit_error_statement, #visit_exclusive_or_expression, #visit_function_abstract_declarator, #visit_function_call_expression, #visit_function_declaration, #visit_grouped_abstract_declarator, #visit_grouped_declarator, #visit_grouped_expression, #visit_identifier_declarator, #visit_inclusive_or_expression, #visit_indirection_expression, #visit_init_declarator, #visit_initializer, #visit_kandr_function_declarator, #visit_kandr_function_definition, #visit_logical_and_expression, #visit_logical_or_expression, #visit_member_access_by_pointer_expression, #visit_member_access_by_value_expression, #visit_member_declaration, #visit_multiplicative_expression, #visit_null_constant_specifier, #visit_object_specifier, #visit_parameter_declaration, #visit_parameter_definition, #visit_parameter_type_list, #visit_pointer_abstract_declarator, #visit_postfix_decrement_expression, #visit_postfix_increment_expression, #visit_prefix_decrement_expression, #visit_prefix_increment_expression, #visit_relational_expression, #visit_shift_expression, #visit_simple_assignment_expression, #visit_sizeof_expression, #visit_sizeof_type_expression, #visit_specifier_qualifier_list, #visit_standard_type_specifier, #visit_string_literal_specifier, #visit_struct_declaration, #visit_struct_declarator, #visit_struct_specifier, #visit_struct_type_declaration, #visit_switch_statement, #visit_translation_unit, #visit_type_name, #visit_typedef_declaration, #visit_typedef_type_specifier, #visit_typeof_type_specifier, #visit_unary_arithmetic_expression, #visit_union_specifier, #visit_union_type_declaration, #visit_variable_declaration, #visit_variable_definition

Constructor Details

#initialize(owner) ⇒ StatementInterpreter

Returns a new instance of StatementInterpreter.



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# File 'lib/adlint/cc1/interp.rb', line 971

def initialize(owner)
  super(owner, Statement)

  # NOTE: All effective controlling expressions in the executing
  #       iteration-statements.
  @effective_ctrlexpr_stack = []
end

Instance Method Details

#visit_break_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1238

def visit_break_statement(node)
  checkpoint(node.location)

  node.executed = true
  BreakEvent.of_break.throw
end

#visit_c99_for_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1197

def visit_c99_for_statement(node)
  checkpoint(node.location)

  scoped_eval do
    interpret(node.declaration)

    node.executed = true
    notify_c99_for_stmt_started(node)

    if ctrlexpr_val = interpret_for_ctrlexpr(node)
      notify_c99_for_ctrlexpr_evaled(node, ctrlexpr_val)
    else
      ctrlexpr_val = scalar_value_of_true
    end

    case
    when ctrlexpr_val.test_must_be_true.true?
      interpret_for_body_statement(node, true)
    when ctrlexpr_val.test_may_be_true.true?
      interpret_for_body_statement(node, false)
    end
  end
ensure
  notify_c99_for_stmt_ended(node)
end

#visit_case_labeled_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 989

def visit_case_labeled_statement(node)
  checkpoint(node.location)

  node.executed = true
  ctrlexpr = node.expression
  ctrlexpr_var = object_to_variable(interpret(ctrlexpr, QUIET), ctrlexpr)
  notify_case_ctrlexpr_evaled(node, ctrlexpr_var)

  interpret(node.statement)
end

#visit_compound_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1007

def visit_compound_statement(node)
  checkpoint(node.location)

  node.executed = true
  scoped_eval do
    begin
      notify_block_started(node)
      node.block_items.each { |item| interpret(item) }
    ensure
      notify_block_ended(node)
    end
  end
end

#visit_continue_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1231

def visit_continue_statement(node)
  checkpoint(node.location)

  node.executed = true
  BreakEvent.of_continue.throw
end

#visit_default_labeled_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1000

def visit_default_labeled_statement(node)
  checkpoint(node.location)

  node.executed = true
  interpret(node.statement)
end

#visit_do_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1145

def visit_do_statement(node)
  checkpoint(node.location)

  node.executed = true
  notify_do_stmt_started(node)

  widen_varying_variable_value_domain(node)

  orig_ctrlexpr, * = node.deduct_controlling_expression

  begin
    enter_iteration_statement(orig_ctrlexpr)
    branch_opts = [ITERATION, NARROWING, FINAL, IMPLICIT_COND, COMPLETE]
    branched_eval(nil, *branch_opts) { interpret(node.statement) }
  ensure
    leave_iteration_statement(orig_ctrlexpr)
  end

  ctrlexpr_obj = interpret(node.expression)
  ctrlexpr_var = object_to_variable(ctrlexpr_obj, node.expression)
  ctrlexpr_val = value_of(ctrlexpr_var)
  notify_variable_value_referred(node.expression, ctrlexpr_var)
  notify_sequence_point_reached(SequencePoint.new(node.expression))
  notify_do_ctrlexpr_evaled(node, ctrlexpr_val)
ensure
  notify_do_stmt_ended(node)
end

#visit_expression_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1021

def visit_expression_statement(node)
  checkpoint(node.location)

  node.executed = true
  notify_expression_stmt_started(node)

  interpret(node.expression) if node.expression
ensure
  notify_expression_stmt_ended(node)
end

#visit_for_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1173

def visit_for_statement(node)
  checkpoint(node.location)

  node.executed = true
  notify_for_stmt_started(node)

  node.initial_statement.accept(self)

  if ctrlexpr_val = interpret_for_ctrlexpr(node)
    notify_for_ctrlexpr_evaled(node, ctrlexpr_val)
  else
    ctrlexpr_val = scalar_value_of_true
  end

  case
  when ctrlexpr_val.test_must_be_true.true?
    interpret_for_body_statement(node, true)
  when ctrlexpr_val.test_may_be_true.true?
    interpret_for_body_statement(node, false)
  end
ensure
  notify_for_stmt_ended(node)
end

#visit_generic_labeled_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 979

def visit_generic_labeled_statement(node)
  checkpoint(node.location)

  node.executed = true
  notify_label_defined(node)

  uninitialize_block_local_variables(node)
  interpret(node.statement)
end

#visit_goto_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1223

def visit_goto_statement(node)
  checkpoint(node.location)

  # TODO: Must implement goto semantics.
  node.executed = true
  notify_goto_stmt_evaled(node, node.identifier.value)
end

#visit_if_else_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1066

def visit_if_else_statement(node)
  checkpoint(node.location)

  node.executed = true

  orig_ctrlexpr = node.expression
  if orig_ctrlexpr == effective_ctrlexpr
    ctrlexpr_val = scalar_value_of_arbitrary
    ctrlexpr = nil
  else
    ctrlexpr_obj = interpret(orig_ctrlexpr)
    ctrlexpr_var = object_to_variable(ctrlexpr_obj, orig_ctrlexpr)
    ctrlexpr_val = value_of(ctrlexpr_var)
    notify_variable_value_referred(orig_ctrlexpr, ctrlexpr_var)
    notify_sequence_point_reached(SequencePoint.new(orig_ctrlexpr))
    ctrlexpr = orig_ctrlexpr.to_normalized_logical
  end
  notify_if_else_ctrlexpr_evaled(node, ctrlexpr_val)

  case
  when ctrlexpr_val.test_must_be_true.true?
    branched_eval(ctrlexpr, NARROWING, FINAL, IMPLICIT_COND, COMPLETE) do
      interpret(node.then_statement)
    end
    return
  when ctrlexpr_val.test_may_be_true.true?
    branched_eval(ctrlexpr, NARROWING, IMPLICIT_COND) do
      interpret(node.then_statement)
    end
  end

  case node.else_statement
  when IfStatement, IfElseStatement
    interpret(node.else_statement)
  else
    branched_eval(nil, NARROWING, COMPLEMENTAL, FINAL, COMPLETE) do
      interpret(node.else_statement)
    end
  end
end

#visit_if_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1032

def visit_if_statement(node)
  checkpoint(node.location)

  node.executed = true

  orig_ctrlexpr = node.expression
  if orig_ctrlexpr == effective_ctrlexpr
    ctrlexpr_val = scalar_value_of_arbitrary
    ctrlexpr = nil
  else
    ctrlexpr_obj = interpret(orig_ctrlexpr)
    ctrlexpr_var = object_to_variable(ctrlexpr_obj, orig_ctrlexpr)
    ctrlexpr_val = value_of(ctrlexpr_var)
    notify_variable_value_referred(orig_ctrlexpr, ctrlexpr_var)
    notify_sequence_point_reached(SequencePoint.new(orig_ctrlexpr))
    ctrlexpr = orig_ctrlexpr.to_normalized_logical
  end
  notify_if_ctrlexpr_evaled(node, ctrlexpr_val)

  case
  when ctrlexpr_val.test_must_be_true.true?
    branched_eval(ctrlexpr, NARROWING, FINAL, IMPLICIT_COND, COMPLETE) do
      interpret(node.statement)
    end
  when ctrlexpr_val.test_may_be_true.true?
    branched_eval(ctrlexpr, NARROWING, FINAL, IMPLICIT_COND) do
      interpret(node.statement)
    end
  else
    # NOTE: To end the current branch group of else-if sequence.
    branched_eval(nil, NARROWING, FINAL) {}
  end
end

#visit_return_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1245

def visit_return_statement(node)
  checkpoint(node.location)

  node.executed = true

  unless node.expression
    notify_return_stmt_evaled(node, nil)
    BreakEvent.of_return.throw
  end

  var = object_to_variable(interpret(node.expression), node.expression)
  notify_variable_value_referred(node.expression, var)

  if active_fun = interpreter._active_function and
      ret_type = active_fun.type.return_type
    if var.type.same_as?(ret_type)
      conved = var
    else
      conved = do_conversion(var, ret_type) || create_tmpvar(ret_type)
      notify_implicit_conv_performed(node.expression, var, conved)
    end
  else
    conved = var
  end

  notify_sequence_point_reached(SequencePoint.new(node))
  notify_return_stmt_evaled(node, var)
  BreakEvent.of_return.throw
end

#visit_while_statement(node) ⇒ Object 



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# File 'lib/adlint/cc1/interp.rb', line 1107

def visit_while_statement(node)
  checkpoint(node.location)

  node.executed = true
  notify_while_stmt_started(node)

  ctrlexpr_obj = interpret_iteration_ctrlexpr(node, node.expression)
  ctrlexpr_var = object_to_variable(ctrlexpr_obj, node.expression)
  ctrlexpr_val = value_of(ctrlexpr_var)

  notify_variable_value_referred(node.expression, ctrlexpr_var)
  notify_sequence_point_reached(SequencePoint.new(node.expression))
  notify_while_ctrlexpr_evaled(node, ctrlexpr_val)

  orig_ctrlexpr, ctrlexpr = node.deduct_controlling_expression

  case
  when ctrlexpr_val.test_must_be_true.true?
    begin
      enter_iteration_statement(orig_ctrlexpr)
      branch_opts = [ITERATION, NARROWING, FINAL, IMPLICIT_COND, COMPLETE]
      branched_eval(ctrlexpr, *branch_opts) { interpret(node.statement) }
    ensure
      leave_iteration_statement(orig_ctrlexpr)
    end
  when ctrlexpr_val.test_may_be_true.true?
    begin
      enter_iteration_statement(orig_ctrlexpr)
      branch_opts = [ITERATION, NARROWING, FINAL, IMPLICIT_COND]
      branched_eval(ctrlexpr, *branch_opts) { interpret(node.statement) }
    ensure
      leave_iteration_statement(orig_ctrlexpr)
    end
  end
ensure
  notify_while_stmt_ended(node)
end