- (crunch-compile EXPRESSION [PORT debug: DBGMODE entry-point: SYMBOL])procedure
Compiles the toplevel expression EXPRESSION into a C++ code, writing the generated code to PORT, which defaults to the value of (current-output-port). If DBGMODE is given, debugging output will be written to the current output port. DBGMODE can be a boolean or a number between 1 and 3. Debug mode 1 shows some information about each compiled procedure, debug mode 3 generates loads of diagnostic output about the type-inferencing process and expanded code.
If the entry-point name SYMBOL is given, then the (normally hidden) toplevel variable of the same name holding a pointer to the associated C++ function can be accessed from C/C++ code, i.e. it is exposed under the same name. Note that the exposed variable is a pointer to a function.
Each invocation of crunch-compile creates its own private namespace, global variables are not visible in subsequent compilation runs in the same process. Syntax definitions are persistent over several invocations, though.