[ASTDumper] Dump DeclContext

[rintaro]

• Include DeclContext of the node where possible
• Add 'default-with-decl-contexts' dump style that dumps the dect context hierarchy in addition to the AST
• Support -dump-parse with -dump-ast-format json

For example, for:

var value = 1 {
    didSet {}
}
class C {
    var foo = 42, bar = 86
    @Custom(arg: 1)
    func method(x: Int) {}
}

-dump-parse -dump-ast-format default-dc emits:

0x156943bd0 Module name=test
  0x156946a08 FileUnit file="test.swift"
    0x1569470b8 TopLevelCodeDecl line=1
    0x156947208 AbstractFunctionDecl name=_ : (no type set)
    0x156947510 ClassDecl name=C
      0x1569476b0 Initializer PatternBinding 0x0x156947858 #0
      0x1569477d8 Initializer PatternBinding 0x0x156947858 #1
      0x15694ffe0 AbstractFunctionDecl name=method(x:) : (no type set)
      0x156947940 Initializer CustomAttribute
(source_file "test.swift"
  (top_level_code_decl decl_context=0x156946a08 range=[test.swift:1:1 - line:3:1]
    (brace_stmt implicit range=[test.swift:1:1 - line:3:1]
      (pattern_binding_decl decl_context=0x1569470b8 range=[test.swift:1:1 - line:3:1]
        (pattern_entry
          (pattern_named "value")
          (original_init=integer_literal_expr type="<null>" value="1" builtin_initializer="**NULL**" initializer="**NULL**")
          (processed_init=integer_literal_expr type="<null>" value="1" builtin_initializer="**NULL**" initializer="**NULL**")))))
  (var_decl decl_context=0x156946a08 range=[test.swift:1:5 - line:1:5] "value"
    (accessor_decl decl_context=0x156946a08 range=[test.swift:2:5 - line:2:13] <anonymous @ 0x156947210> didSet for="value" thrown_type="<null>"
      (parameter_list range=[test.swift:2:5 - line:2:5]
        (parameter "oldValue" decl_context=0x156947208))
      (brace_stmt range=[test.swift:2:12 - line:2:13])))
  (class_decl decl_context=0x156946a08 range=[test.swift:4:1 - line:8:1] "C"
    (pattern_binding_decl decl_context=0x156947510 range=[test.swift:5:5 - line:5:25]
      (pattern_entry init_context=0x1569476b0
        (pattern_named "foo")
        (original_init=integer_literal_expr type="<null>" value="42" builtin_initializer="**NULL**" initializer="**NULL**")
        (processed_init=integer_literal_expr type="<null>" value="42" builtin_initializer="**NULL**" initializer="**NULL**"))
      (pattern_entry init_context=0x1569477d8
        (pattern_named "bar")
        (original_init=integer_literal_expr type="<null>" value="86" builtin_initializer="**NULL**" initializer="**NULL**")
        (processed_init=integer_literal_expr type="<null>" value="86" builtin_initializer="**NULL**" initializer="**NULL**")))
    (var_decl decl_context=0x156947510 range=[test.swift:5:9 - line:5:9] "foo")
    (var_decl decl_context=0x156947510 range=[test.swift:5:19 - line:5:19] "bar")
    (func_decl decl_context=0x156947510 range=[test.swift:7:5 - line:7:26] "method(x:)"
      (custom_attr range=[test.swift:6:5 - line:6:19] init_context=0x156947940
        (type_unqualified_ident id="Custom" unbound)
        (argument_list labels="arg:"
          (argument label="arg"
            (integer_literal_expr type="<null>" value="1" builtin_initializer="**NULL**" initializer="**NULL**"))))
      (parameter "self" decl_context=0x15694ffe0) thrown_type="<null>"
      (parameter_list range=[test.swift:7:16 - line:7:23]
        (parameter "x" decl_context=0x15694ffe0 apiName="x"))
      (brace_stmt range=[test.swift:7:25 - line:7:26]))))

You can verify the each AST node references the correct DeclContext.

[rintaro]

This is a utility to use -dump-ast results in the test suite. This gives stable "address" representation across multiple test runs.
Currently not used, but I will use this in near future.

[rintaro]

@swift-ci Please smoke test

[rintaro]

@swift-ci Please smoke test

[rintaro]

@swift-ci Please smoke test

[rintaro]

@swift-ci Please smoke test Linux

[rintaro]

@swift-ci Please smoke test Windows