Error Handler Macros

Navigate the error handler pair tree (jmp-ptr (saved-env . previous) error-value . line). A guard's handler carries the handler it displaced in the previous slot, so every installed handler stays reachable from the error_handler slot while the innermost is; a base-eval handler leaves it nil and is consed onto the target's stack. More...

Macros
#define	x_error_handler_jmp(H)   x_ptrval(x_firstobj(H))
#define	x_error_handler_saved_env(H)   x_001(H)
#define	x_error_handler_error(H)   x_011(H)
#define	x_error_handler_line(H)   x_111(H)

Detailed Description

Navigate the error handler pair tree (jmp-ptr (saved-env . previous) error-value . line). A guard's handler carries the handler it displaced in the previous slot, so every installed handler stays reachable from the error_handler slot while the innermost is; a base-eval handler leaves it nil and is consed onto the target's stack.

Macro Definition Documentation

x_error_handler_error

#define x_error_handler_error

(

H

)

x_011(H)

x_error_handler_jmp

#define x_error_handler_jmp

(

H

)

x_ptrval(x_firstobj(H))

x_error_handler_line

#define x_error_handler_line

(

H

)

x_111(H)

x_error_handler_saved_env

#define x_error_handler_saved_env

(

H

)

x_001(H)