Declarations
Declarations
When we encounter declarations, we need to lay out storage for the declared variables.
For every local name in a procedure, we create a ST(Symbol Table) entry containing:
- The type of the name
- How much storage the name requires
The production:
A suitable transition scheme for declarations would be:
| Production rule | Semantic action |
|---|---|
| D → integer, id | ENTER (id.PLACE, integer) D.ATTR = integer |
| D → real, id | ENTER (id.PLACE, real) D.ATTR = real |
| D → D1, id | ENTER (id.PLACE, D1.ATTR) D.ATTR = D1.ATTR |
ENTER is used to make the entry into symbol table and ATTR is used to trace the data type.
Labels: CD Unit-3, Compiler Design
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