diff options
Diffstat (limited to 'SemanticCheckList.txt')
-rw-r--r-- | SemanticCheckList.txt | 38 |
1 files changed, 20 insertions, 18 deletions
diff --git a/SemanticCheckList.txt b/SemanticCheckList.txt index f7fb1c7..446a442 100644 --- a/SemanticCheckList.txt +++ b/SemanticCheckList.txt @@ -4,38 +4,40 @@ DRAGON Semantic Checklist [X] 1. Semantic rules for Scoping [X] 1.1. Local objects cannot be declared more than once [X] 1.2. Local objects hide non-local objects with the same name -[X] 1.3. Non-local objects should be visible from inner scopes (unless a local object of the same name exists) -[X] 1.4. Function and procedure names exist in the scope they are defined (and not in their own scopes) +[X] 1.3. Non-local objects should be visible from inner scopes + (unless a local object of the same name exists) +[X] 1.4. Function and procedure names exist in the scope they are + defined (and not in their own scopes) [X] 1.5. Local objects cease to exist once their scopes cease to exist [X] 2. Semantic rules for Expressions [X] 2.1. Expressions return typed-values [X] 2.2. Objects must be declared before they used in expressions -[X] 2.3. Objects of different types cannot appear in the same expression (no type promotions) +[X] 2.3. Objects of different types cannot appear in the same + expression (no type promotions) [ ] 3. Semantic rules for Statements [ ] 3.1. Statements do not return values - TODO: Add check for return type on statements, parsing - statement_list? -[X] 3.2. The test expression for IF-THEN, IF-THEN-ELSE, WHILE-DO must be Boolean-valued; -[X] note that the Boolean type must be implicitly defined -[X] 3.3. The ELSE clause always binds to the closest IF (resolution of the dangling ELSE problem) -[ ] 3.4. The variable type in FOR-DO must match the types of lower bound and upper bound expressions +[ ] 3.2. The test expression for IF-THEN, IF-THEN-ELSE, WHILE-DO + must be Boolean-valued; + note that the Boolean type must be implicitly defined +[X] 3.3. The ELSE clause always binds to the closest IF (resolution + of the dangling ELSE problem) +[X] 3.4. The variable type in FOR-DO must match the types of lower bound and upper bound expressions -[ ] 4. Semantic rules for Arrays +[X] 4. Semantic rules for Arrays [X] 4.1. Non-integer valued expressions cannot be used for indexing arrays [ ] 5. Semantic rules for Functions -[X] 5.1. Function calls return values of type Integer or Real +[ ] 5.1. Function calls return values of type Integer or Real [ ] 5.2. Function must contain a "return" statement within its own body; this is of the form: <function_name> := <expression> -[ ] 5.3. Functions must accept exactly the same number of arguments as is +[X] 5.3. Functions must accept exactly the same number of arguments as is declared in its header, with the correct sequence of types - TODO: Fix array types. -[X] 5.4. Functions are not allowed to update the value of nonlocal objects (via assignment statements) +[X] 5.4. Functions are not allowed to update the value of nonlocal + objects (via assignment statements) -[ ] 6. Semantic rules for Procedures -[ ] 6.1. Procedure calls do not return values -[ ] 6.2. Procedures must accept exactly the same number of arguments as is +[X] 6. Semantic rules for Procedures +[X] 6.1. Procedure calls do not return values +[X] 6.2. Procedures must accept exactly the same number of arguments as is declared in its header, with the correct sequence of types - TODO: Fix array types. |