187 lines
7.3 KiB
Groff
187 lines
7.3 KiB
Groff
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.TH INTERROGATE 1 "27 December 2014" "" Panda3D
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.SH NAME
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interrogate \- generate scripting language bindings for C/C++ APIs
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.SH SYNOPSIS
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.B interrogate
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[
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.I opts
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]
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.I file.C
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[
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.I file.C ...
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]
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.SH DESCRIPTION
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Interrogate is a program to parse a body of C++ code and build up a table
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of classes, methods, functions, and symbols found, for the purposes of
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calling into the codebase via a non-C++ scripting language like Scheme,
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Smalltalk, or Python.
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.PP
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In addition to identifying all the classes and their relationships,
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interrogate will generate a wrapper function for each callable function.
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The wrapper functions will be callable directly from the scripting language,
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with no understanding of C++ necessary; these wrapper functions will in turn
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call the actual C++ functions or methods.
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.PP
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Most exportable features of C++ are supported, including templates, default
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parameters, and function overloading.
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.SH OPTIONS
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.TP
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.BI "\-oc " output.C
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Specify the name of the file to which generated code will be written.
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This includes all of the function wrappers, as well as those tables
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which must be compiled into the library.
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.TP
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.BI "\-od " output.in
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Specify the name of the file to which the non-compiled data tables
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will be written. This file describes the relationships between
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all the types and the functions, and associates the function wrappers
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above with this data. This file will be opened and read at runtime
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when the scripting language first calls some interrogate query
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function.
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.TP
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.BI "\-srcdir " directory
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Specify the name of the directory to which the source filenames are
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relative.
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.TP
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.BI "\-module " module_name
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Defines the name of the module this data is associated with. This
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is strictly a code-organizational tool. Conceptually, a module is
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the highest level of grouping for interrogate data; a module may
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contain several libraries. If this is omitted, no module name is
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specified.
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.PP
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Sometimes, depending on the type of wrappers being generated, there
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may be additional code that needs to be generated on the module
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level, above that which was already generated at the library level.
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Python, for instance, generates the table of python-callable function
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wrappers at the module level. Use the program
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.BR interrogate_module (1)
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to generate the appropriate code at the module level.
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.TP
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.BI "\-library " library_name
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Defines the name of the library this data is associated with. This
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is another code-organizational tool. Typically, there will be one
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invocation of interrogate for each library, and there will be
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multiple libraries per module. If this is omitted, no library name
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is specified.
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.TP
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.B \-do\-module
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Generate whatever module-level code should be generated immediately,
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rather than waiting for a special
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.BR interrogate_module (1)
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pass. This, of course, prohibits grouping several libraries together
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into a single module.
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.TP
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.B \-fptrs
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Make void* pointers to the function wrappers directly available. A
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scripting language will be able to call the interrogate functions
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directly by pointer.
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.TP
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.B \-fnames
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Make the names of the function wrappers public symbols so that the
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scripting language will be able to call the interrogate functions
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by name.
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.PP
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Either or both of \fB\-fptrs\fP and/or \fB\-fnames\fP may be specified.
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If both are omitted, the default is \fB\-fnames\fP.
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.TP
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.B \-string
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Treat char* and basic_string<char> as special cases, and map
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parameters of these types to type atomic string. The scripting
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language will see only functions that receive and return strings,
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not pointers to character or structures of basic_string<char>.
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If C calling convention wrappers are being generated, the atomic
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string type means type char*. In any other calling convention, the
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atomic string type is whatever the native string type is.
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.TP
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.B \-refcount
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Treat classes that inherit from a class called ReferenceCount as a
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special case. Any wrapper function that returns a pointer to
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one of these classes will automatically increment the reference
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count by calling ref() on the object first, and any destructors
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that are generated will call unref_delete() on the object instead of
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simply delete.
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.PP
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Furthermore, parameters of type PointerTo<N> or ConstPointerTo<N>
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will automatically be mapped to N * and const N *, respectively.
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.TP
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.B \-assert
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Generate code in each wrapper that will check the state of the assert
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flag and trigger an exception in the scripting language when a
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C++ assertion fails. Presently, this only has meaning to the Python
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wrappers.
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.TP
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.B \-true\-names
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Use the actual name of the function being wrapped as the name of
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the generated wrapper function, instead of an ugly hash name.
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This means the wrapper functions may be called directly using a
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meaningful name (especially if \fB\-fnames\fP is also given), but it
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also means that C++ function overloading (including default values
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for parameters) cannot be used, as it will lead to multiple wrapper
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functions with the same name.
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.TP
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.B \-c
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Generate function wrappers using the C calling convention. Any
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scripting language that can call a C function should be able to
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make advantage of the interrogate database.
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.TP
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.B \-python
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Generate function wrappers using the Python calling convention.
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The shared library will be directly loadable as a Python module
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(especially if the module definitions are made available either by
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running
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.BR interrogate_module (1)
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later, or by specifying \fB\-do\-module\fP on the command line now).
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However, C++ objects and methods will be converted into an object
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handle and a list of independent Python functions.
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.TP
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.B \-python\-obj
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Generate Python function wrappers that convert C++ objects to true
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python objects, with all methods converted to Python methods. This
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is currently experimental.
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.TP
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.B \-python\-native
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Generate Python function wrappers that convert C++ objects to true
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python objects, with all methods converted to Python methods. This
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is the recommended method for creating Python wrappers.
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.PP
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Any combination of \fB\-c\fP, \fB\-python\fP, or \fB\-python\-obj\fP
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may be specified. If all are omitted, the default is \fB\-c\fP.
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.TP
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.B \-track\-interpreter
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Generate code within each wrapper function to adjust the global
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variable "in_interpreter" to indicated whether code is running
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within the Panda C++ environment or within the high-level language.
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.TP
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.B \-unique\-names
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Compile a table into the library (i.e. generate code into the
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\fB\-oc\fP file) that defines a lookup of each function wrapper by
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its unique name. This makes it possible to consistently identify
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function wrappers between sessions, at the cost of having this
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additional table in memory.
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.TP
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.B \-nodb
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Do not build a full interrogate database, but just generate function
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wrappers. It is assumed that the user will know how to call the
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function wrappers already, from some external source. This is most
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useful in conjunction with \fB\-true\-names\fP.
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.TP
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.BI "\-longlong " typename
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Specify the name of the 64-bit integer type for the current compiler.
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By default, this is "long long".
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.TP
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.B \-promiscuous
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Export *all* public symbols, functions, and classes seen, even those
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not explicitly marked to be published.
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.TP
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.B \-spam
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Generate wrapper functions that report each invocation to Notify.
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This can sometimes be useful for tracking down bugs.
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.TP
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.B \-noangles
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Treat #include <file> the same as #include "file". This means
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\fB\-I\fP and \fB\-S\fP are equivalent.
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.SH "SEE ALSO"
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.BR interrogate_module (1),
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.BR test_interrogate (1)
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