diff options
Diffstat (limited to 'include/ruby/internal/interpreter.h')
-rw-r--r-- | include/ruby/internal/interpreter.h | 235 |
1 files changed, 223 insertions, 12 deletions
diff --git a/include/ruby/internal/interpreter.h b/include/ruby/internal/interpreter.h index 29dee60aab..a10e7ad2d8 100644 --- a/include/ruby/internal/interpreter.h +++ b/include/ruby/internal/interpreter.h @@ -17,10 +17,11 @@ * 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. + * 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" @@ -28,65 +29,275 @@ 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 +/** + * @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 */ +/** + * 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); -/*! @} */ +/** @} */ -void ruby_init_stack(volatile VALUE*); +/** + * 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(void *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); -int ruby_cleanup(volatile int); +/** + * 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); -size_t ruby_stack_length(VALUE**); +/** + * 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 `$0 = name` in Ruby level but also affects + * `Method#location` and others. + * + * @param[in] name File name to set. + */ void ruby_script(const char* name); + +/** + * Identical to ruby_script(), except it takes the name as a Ruby String + * instance. + * + * @param[in] name File name to set. + */ void ruby_set_script_name(VALUE name); +/** Defines built-in variables */ void ruby_prog_init(void); -void ruby_set_argv(int, char**); -void *ruby_process_options(int, char**); + +/** + * Sets argv that ruby understands. Your program might have its own command + * line parameters etc. Handle them as you wish, and pass remaining parts of + * argv here. + * + * @param[in] argc Number of elements of `argv`. + * @param[in] argv Command line arguments. + */ +void ruby_set_argv(int argc, char **argv); + +/** + * Identical to ruby_options(), except it raises ruby-level exceptions on + * failure. + * + * @param[in] argc Process main's `argc`. + * @param[in] argv Process main's `argv`. + * @return An opaque "node" pointer. + */ +void *ruby_process_options(int argc, char **argv); + +/** + * Sets up `$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); -void ruby_incpush(const char*); + +/** + * 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() |