org.kiama.example.oberon0.drivers
A3
Marker trait for all built-in entities.
Marker trait for all built-in entities.
A built-in procedure with its parameter information.
A built-in procedure with its parameter information.
A built-in type with an implicit definition that the compiler must have special knowledge about.
A built-in type with an implicit definition that the compiler must have special knowledge about. This mechanism is necessary since the built-in types cannot be defined using source concepts.
A user-defined constant entity represented by a constant declaration.
A user-defined constant entity represented by a constant declaration.
A built-in value of some type that is represented by a particular integer value.
A built-in value of some type that is represented by a particular integer value. The type does not have to be INTEGER. In other words, this value cannot be defined using a constant declaration so the compiler has to have special knowledge of them.
A user-defined module represented by a module declaration.
A user-defined module represented by a module declaration.
Information about a particular parameter.
Information about a particular parameter. Similar to Parameter but the type has been replaced with its definition.
A parameter is a variable augmented with a passing mode.
A parameter is a variable augmented with a passing mode.
A procedure entity represented by a procedure declaration.
A procedure entity represented by a procedure declaration.
An entity representing by a user-provided type declaration.
An entity representing by a user-provided type declaration.
A user-defined type.
A user-defined type.
A variable entity including a reference to its types' definition.
A variable entity including a reference to its types' definition.
The name of this artefact.
The actual type of an expression following type aliases.
The actual type of an expression following type aliases.
Pretty-print a block, omitting the BEGIN if there are no statements.
Pretty-print a block, omitting the BEGIN if there are no statements. Add the possibility of declarations to the previous level.
Built-in Boolean type.
Built-in Boolean type.
Return an IF cascade equivaleant to the given cases and optional else block.
Return an IF cascade equivaleant to the given cases and optional else block. The variable ce holds the selection value. Specifically, these cases on ce CASE e1 : s1 CASE e2 .. e3 : s2 ELSE s3 are transformed into IF ce = e1 THEN s1 ELSEIF (ce >= e2) & (ce <= e3) THEN s2 ELSE 32 END If a case has more than one condition then they are combined with Or operators.
Check for non-local variable and procedure accesses.
Check for non-local variable and procedure accesses. In the L3 language non-local variable accesses are disallowed, unless they are to a variable at the top level. Non-local procedure accesses are just disallowed.
Consume the AST.
Consume the AST. For example, translate it to something else. By default, do nothing.
The built-in type associated with a type declaration.
The built-in type associated with a type declaration.
The default environment.
The default environment.
The default environment with pre-defined procedures added.
The default environment with pre-defined procedures added.
The type given by a type definition.
The type given by a type definition.
Desugar CASE statements into equivalent blocks containing cascading IF statements.
Desugar CASE statements into equivalent blocks containing cascading IF statements. A new variable called "casevar" is introduced in the block to hold the selection value so that it does not need to be re-evaluated. Specifically, CASE e OF cases END is transformed into VAR caseval : INTEGER; BEGIN caseval := e; IF caseval ... THEN ... END END
Desugar FOR statements into equivalent blocks containing a WHILE loop.
Desugar FOR statements into equivalent blocks containing a WHILE loop. A new variable called "limit" is introduced in the block to hold the upper limit of the FOR to protect against changes in the body. Specifically, FOR id := e1 TO e2 BY e3 DO body END is transformed into VAR limit : INTEGER; BEGIN id := e1; limit := e2; WHILE (id op limit) DO body id := id + e3 END END If e3 is negative, op is <=, otherwise it is >=.
The program entity referred to by an identifier definition or use.
The program entity referred to by an identifier definition or use. In the case of a definition it's the thing being defined, so define it to be a reference to the declaration. If it's already defined, return a entity that indicates a multiple definition. In the case of a use, it's the thing defined elsewhere that is being referred to here, so look it up in the environment.
The entity for an identifier definition as given by its declaration context.
The entity for an identifier definition as given by its declaration context.
The environment containing bindings for all identifiers visible at the given node.
The environment containing bindings for all identifiers visible at the given node. It starts at the module declaration with the default environment. At blocks we enter a nested scope which is removed on exit from the block. At constant and type declarations the left-hand side binding is not in scope on the right-hand side. Each identifier definition just adds its binding to the chain. The envout cases for assignment and expression mean that we don't need to traverse into those constructs, since declarations can't occur there.
Blocks that are immediately inside procedure decls do not introduce new scopes since the procedure itself does.
Blocks that are immediately inside procedure decls do not introduce new scopes since the procedure itself does. This computation overrides the one earlier that pushes a scope for all blocks. Don't include the procedure name in the scope of its own body.
Similarly for envin we don't need to leave a scope for a procedure block, since we didn't enter one.
Similarly for envin we don't need to leave a scope for a procedure block, since we didn't enter one. The IdnDef that is for a ProcDecl needs to be in the outer scope, but not in the scope of its own body. All arguments and local declarations go in the nested scope.
The semantic errors for a tree.
The semantic errors for a tree.
The error checking for this level.
The error checking for this level.
Is an expression expected to be constant or not? Either the expression is the root of an expected constant expression or its parent expression is expected to be constant.
Is an expression expected to be constant or not? Either the expression is the root of an expected constant expression or its parent expression is expected to be constant.
The type expected of an expression as defined by its context.
The type expected of an expression as defined by its context.
The expected type of a parameter to a call is the type of the parameter at that position.
The expected type of a parameter to a call is the type of the parameter at that position.
Built-in false constant.
Built-in false constant.
The type of the entity denoted by an identifier use.
The type of the entity denoted by an identifier use.
The type of a parameter is the type of its underlying variable.
The type of a parameter is the type of its underlying variable.
Perform initialisation of semantic analysis that is necessary before processing an AST.
Perform initialisation of semantic analysis that is necessary before processing an AST.
Built-in integer type.
Built-in integer type.
Return true if the given type is Boolean or an unknown type.
Return true if the given type is Boolean or an unknown type.
Compatibility of types.
Compatibility of types. Return true if the type is compatible with the expected type. Unknown types are compatible with any other type. Otherwise, use look up the base types of what we have and compare them.
Return true if the entity is erroneous or is a constant.
Return true if the entity is erroneous or is a constant.
Return true if the entity is an error, false otherwise.
Return true if the entity is an error, false otherwise.
Return true if the given type is integer or an unknown type.
Return true if the given type is integer or an unknown type.
Return true if the expression can legally appear on the left-hand side of an assignment statement.
Return true if the expression can legally appear on the left-hand side of an assignment statement. At this level only allow identifiers of variables or things we don't know anything about. The true default is used so that this computation can be used in redefinitions.
Return true if the entity is erroneous or is a module.
Return true if the entity is erroneous or is a module.
Return true if the identifier is an r-value and hence its value can be used (ie.
Return true if the identifier is an r-value and hence its value can be used (ie. it's erroneous or is a constant, value or variable).
Return true if the entity is erroneous or is a type.
Return true if the entity is erroneous or is a type.
Parameters are variables too.
Parameters are variables too.
Is an expression constant or not? Unknown entities are constant.
Is an expression constant or not? Unknown entities are constant. Strictly speaking we only need to support integer expressions here, but we treat Boolean ones as constant in the same way so that we avoid spurious errors. Type analysis will reject Boolean constant expressions anyway.
Level of a node considering the module level to be zero and incrementing each time we enter a nested procedure declaration.
Level of a node considering the module level to be zero and incrementing each time we enter a nested procedure declaration.
Calculate the number of parameters to a procedure.
Calculate the number of parameters to a procedure. Return None if the identifier use does not denote a procedure.
Calculate the parameter information list for a procedure.
Calculate the parameter information list for a procedure. If it's a built-in we have the information already, otherwise we need to work it out from the declaration. Returns None if the entity is not a procedure.
Return the ith parameter mode of the procedure denoted by u (counting from one).
Return the ith parameter mode of the procedure denoted by u (counting from one). If u is not a procedure or has less than i parameters, return a value mode, since that mode places no constraints on its actual parameter.
Return the ith parameter type of the procedure denoted by u (counting from one).
Return the ith parameter type of the procedure denoted by u (counting from one). If u is not a procedure or has less than i parameters, return an unknown type.
Process the given abstract syntax tree.
Process the given abstract syntax tree. Send output to emitter, marking sections so that we can split things later.
Process the AST by transforming it.
Process the AST by transforming it. Then apply higher-level transformations.
Custom driver for section tagging and challenge mode for errors.
Custom driver for section tagging and challenge mode for errors. If a parse error occurs: in challenge mode, just send "parse failed" to standard output, otherwise send the message to the errors file.
The built-in Read procedure.
The built-in Read procedure.
(Changed in version 2.9.0) The p0 call-by-name arguments is evaluated at most once per constructed Parser object, instead of on every need that arises during parsing.
Is this expression the root of what is expected to be a constant expression? At this level only expressions on the RHS of a constant declaration have this property.
Is this expression the root of what is expected to be a constant expression? At this level only expressions on the RHS of a constant declaration have this property.
Output a section heading so that the output can be split later.
Output a section heading so that the output can be split later.
Pretty-print a nested list of nodes separated by sep (default: semi colon) and line breaks.
Pretty-print a nested list of nodes separated by sep (default: semi colon) and line breaks.
The type of an expression.
The type of an expression.
Desugar FOR and CASE statements into simpler constructs.
Desugar FOR and CASE statements into simpler constructs. Then call the next level of transformation.
Built-in true constant.
Built-in true constant.
The actual type that a user type denotes.
The actual type that a user type denotes.
Rename user-defined names to avoid clashes with outer declarations of the same name.
Rename user-defined names to avoid clashes with outer declarations of the same name. This transformation is not idempotent.
A type that is unknown, eg because the typed thing is erroneously defined.
A type that is unknown, eg because the typed thing is erroneously defined.
What is the value of an integer expression? Only needs to be valid if the expression is an integer constant (see isconst above) and is defined (eg, no divide by zero.) Returns zero in all other cases.
What is the value of an integer expression? Only needs to be valid if the expression is an integer constant (see isconst above) and is defined (eg, no divide by zero.) Returns zero in all other cases. FIXME: Ignores issues of overflow.
The built-in Write procedure.
The built-in Write procedure.
The built-in WriteLn procedure.
The built-in WriteLn procedure.
(Since version 1.2.1) Use PrettyPrinter.any instead.