Java Reference
In-Depth Information
/
Generalized visitor code for Marker
12
/
procedure
visit
(VariableListDeclaring
vld
)
typeVisitor
←
new
TypeVisitor()
call
vld
.
itemType
.
accept(
typeVisitor
)
declType
←
vld
.
itemType
.
type
33
if
vld
.
initialization
null
then
checkingVisitor
←
34
new
SemanticsVisitor()
call
vld
.
initialization
.
accept(
checkingVisitor
)
if not
assignable
(
vld
.
initialization
.
type
,
declType
)
35
then
call
error
(”
Initialization expression not assignable to variable type at
”
,
vld
)
else
if
const
∈
vld
.
modi f iers
then
call
error
36
(”
Initialization expression missing in constant declaration at
”
,
vld
)
foreach
id
∈
vld
.
itemIdList
do
if
currentSymbolTable
.
declaredLocally(
id
.
name
)
then
call
error
(”
Variable name cannot be redeclared
:”
,
id
.
name
)
id
.
type
←
errorType
id
.
attributesRe f
←
null
else
attr
.
kind
←
variableAttributes
attr
.
variableType
←
declType
attr
.
modi f iers
←
declType
call
currentSymbolTable
.
enterSymbol(
id
.
name
,
attr
)
id
.
type
←
declType
id
.
attributesRe f
←
attr
37
end
Figure 8.18: Code for TopDeclVisitor's VariableListDeclaring
ArrayDefining
ArrayDefining
size
elementType
lower
upper
elementType
Type
IntegerLiteral
Constant
Subtree
Constant
Type
Subtree
Expression
Expression
Subtree
value
Subtree
Size of array specified
Upper and lower bounds included
(a)
(b)
Figure 8.19: Abstract Syntax Trees for Array Definitions
