Method CompilerEnvironment()->PikeCompiler()->apply_attribute_constant()

Method apply_attribute_constant

type apply_attribute_constant(string attr, mixed value, type arg_type, void cont_type, mapping state)

Description

Handle constant arguments to attributed function argument types.

Parameter attr

Attribute that arg_type had.

Parameter value

Constant value sent as parameter.

Parameter arg_type

Declared type of the function argument.

Parameter cont_type

Continuation function type after the current argument.

Parameter state

Mapping intended to hold state during checking of multiple arguments.

This function is called when a function is called with the constant value value and it has been successfully matched against arg_type, and arg_type had the type attribute attr.

This function is typically used to perform specialized argument checking and to allow for a strengthening of the function type based on value.

The default implementation handles the following attributes:

sprintf_args: This marks the arguments to sprintf().
sprintf_format and strict_sprintf_format: These mark arguments that will be sent as the first argument to sprintf().
sprintf_result: This marks the return value for sprintf().
sscanf_format and sscanf_76_format: These mark arguments that will be sent as the second argument to sscanf().
sscanf_input: This is the input for sscanf().

Returns

Returns a continuation type if it succeeded in strengthening the type.

Returns UNDEFINED otherwise (this is not an error indication).