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#ifndef RBIMPL_INTERPRETER_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_INTERPRETER_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Interpreter embedding APIs.
*/
#include "ruby/internal/attr/noreturn.h"
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
/**
* @defgroup embed CRuby Embedding APIs
*
* CRuby interpreter APIs. These are APIs to embed MRI interpreter into your
* program.
* These functions are not a part of Ruby extension library API.
* Extension libraries of Ruby should not depend on these functions.
*
* @{
*/
/**
* @defgroup ruby1 ruby(1) implementation
*
* A part of the implementation of ruby(1) command.
* Other programs that embed Ruby interpreter do not always need to use these
* functions.
*
* @{
*/
RBIMPL_ATTR_NONNULL(())
/**
* Initializes the process for libruby.
*
* This function assumes this process is `ruby(1)` and it has just started.
* Usually programs that embed CRuby interpreter may not call this function,
* and may do their own initialization.
*
* @param[in] argc Pointer to process main's `argc`.
* @param[in] argv Pointer to process main's `argv`.
* @warning `argc` and `argv` cannot be `NULL`.
*
* @internal
*
* AFAIK Ruby does write to argv, especially `argv[0][0]`, via setproctitle(3).
* It is intentional that the argument is not const-qualified.
*/
void ruby_sysinit(int *argc, char ***argv);
/**
* Calls ruby_setup() and check error.
*
* Prints errors and calls exit(3) if an error occurred.
*/
void ruby_init(void);
/**
* Processes command line arguments and compiles the Ruby source to execute.
*
* This function does:
* - Processes the given command line flags and arguments for `ruby(1)`
* - Compiles the source code from the given argument, `-e` or `stdin`, and
* - Returns the compiled source as an opaque pointer to an internal data
* structure
*
* @param[in] argc Process main's `argc`.
* @param[in] argv Process main's `argv`.
* @return An opaque pointer to the compiled source or an internal special
* value. Pass it to ruby_executable_node() to detect which.
* @see ruby_executable_node
*/
void* ruby_options(int argc, char** argv);
/**
* Checks the return value of ruby_options().
*
* ruby_options() sometimes returns a special value to indicate this process
* should immediately exit. This function checks if the case. Also stores the
* exit status that the caller have to pass to exit(3) into `*status`.
*
* @param[in] n A return value of ruby_options().
* @param[out] status Pointer to the exit status of this process.
* @retval 0 The given value is such a special value.
* @retval otherwise The given opaque pointer is actually a compiled
* source.
*/
int ruby_executable_node(void *n, int *status);
/**
* Runs the given compiled source and exits this process.
*
* @param[in] n Opaque "node" pointer.
* @retval EXIT_SUCCESS Successfully run the source.
* @retval EXIT_FAILURE An error occurred.
*/
int ruby_run_node(void *n);
/* version.c */
/** Prints the version information of the CRuby interpreter to stdout. */
void ruby_show_version(void);
#ifndef ruby_show_copyright
/** Prints the copyright notice of the CRuby interpreter to stdout. */
void ruby_show_copyright(void);
#endif
/**
* A convenience macro to call ruby_init_stack().
* Must be placed just after variable declarations.
*/
#define RUBY_INIT_STACK \
VALUE variable_in_this_stack_frame; \
ruby_init_stack(&variable_in_this_stack_frame);
/** @} */
/**
* Set stack bottom of Ruby implementation.
*
* You must call this function before any heap allocation by Ruby
* implementation. Or GC will break living objects.
*
* @param[in] addr A pointer somewhere on the stack, near its bottom.
*/
void ruby_init_stack(volatile VALUE *addr);
/**
* Initializes the VM and builtin libraries.
*
* @retval 0 Initialization succeeded.
* @retval otherwise An error occurred.
*
* @internal
*
* Though not a part of our public API, the return value is in fact an enum
* ruby_tag_type. You can see the potential "otherwise" values by looking at
* vm_core.h.
*/
int ruby_setup(void);
/**
* Destructs the VM.
*
* Runs the VM finalization processes as well as ruby_finalize(), and frees
* resources used by the VM.
*
* @param[in] ex Default value to the return value.
* @retval EXIT_FAILURE An error occurred.
* @retval ex Successful cleanup.
* @note This function does not raise any exception.
*/
int ruby_cleanup(int ex);
/**
* Runs the VM finalization processes.
*
* `END{}` and procs registered by `Kernel.#at_exit` are executed here. See the
* Ruby language spec for more details.
*
* @note This function is allowed to raise an exception if an error occurred.
*/
void ruby_finalize(void);
RBIMPL_ATTR_NORETURN()
/** Calls ruby_cleanup() and exits the process. */
void ruby_stop(int);
/**
* Checks for stack overflow.
*
* @retval true NG machine stack is about to overflow.
* @retval false OK there still is a room in the stack.
*
* @internal
*
* Does anybody use it? So far @shyouhei have never seen any actual use-case.
*/
int ruby_stack_check(void);
/**
* Queries what Ruby thinks is the machine stack. Ruby manages a region of
* memory. It calls that area the "machine stack". By calling this function,
* in spite of its name, you can obtain both one end of the stack and its
* length at once. Which means you can know the entire region.
*
* @param[out] topnotch On return the pointer points to the upmost address of
* the macihne stack that Ruby knows.
* @return Length of the machine stack that Ruby knows.
*
* @internal
*
* Does anybody use it? @shyouhei is quite skeptical if this is useful outside
* of the VM. Maybe it was a wrong idea to expose this API to 3rd parties.
*/
size_t ruby_stack_length(VALUE **topnotch);
/**
* Identical to ruby_run_node(), except it returns an opaque execution status.
* You can pass it to rb_cleanup().
*
* @param[in] n Opaque "node" pointer.
* @retval 0 Successful end-of-execution.
* @retval otherwise An error occurred.
*
* @internal
*
* Though not a part of our public API, the return value is in fact an enum
* ruby_tag_type. You can see the potential "otherwise" values by looking at
* vm_core.h.
*/
int ruby_exec_node(void *n);
/**
* Sets the current script name to this value.
*
* This is similar to `$0 = name` in Ruby level but also affects
* `Method#location` and others.
*
* @param[in] name File name to set.
*/
void ruby_script(const char* name);
/**
* Identical to ruby_script(), except it takes the name as a Ruby String
* instance.
*
* @param[in] name File name to set.
*/
void ruby_set_script_name(VALUE name);
/** Defines built-in variables */
void ruby_prog_init(void);
/**
* Sets argv that ruby understands. Your program might have its own command
* line parameters etc. Handle them as you wish, and pass remaining parts of
* argv here.
*
* @param[in] argc Number of elements of `argv`.
* @param[in] argv Command line arguments.
*/
void ruby_set_argv(int argc, char **argv);
/**
* Identical to ruby_options(), except it raises ruby-level exceptions on
* failure.
*
* @param[in] argc Process main's `argc`.
* @param[in] argv Process main's `argv`.
* @return An opaque "node" pointer.
*/
void *ruby_process_options(int argc, char **argv);
/**
* Sets up `$LOAD_PATH`.
*
* @internal
*
* @shyouhei guesses this has to be called at very later stage, at least after
* the birth of object system. But is not exactly sure when.
*/
void ruby_init_loadpath(void);
/**
* Appends the given path to the end of the load path.
*
* @pre ruby_init_loadpath() must be done beforehand.
* @param[in] path The path you want to push to the load path.
*/
void ruby_incpush(const char *path);
/**
* Clear signal handlers.
*
* Ruby installs its own signal handler (apart from those which user scripts
* set). This is to clear that. Must be called when the ruby part terminates,
* before switching to your program's own logic.
*/
void ruby_sig_finalize(void);
/** @} */
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_INTERPRETER_H */
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