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#ifndef RBIMPL_EVAL_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_EVAL_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 Declares ::rb_eval_string(). */ #include "ruby/internal/dllexport.h" #include "ruby/internal/attr/nonnull.h" #include "ruby/internal/value.h" RBIMPL_SYMBOL_EXPORT_BEGIN() RBIMPL_ATTR_NONNULL(()) /** * Evaluates the given string. * * In case it is called from within a C-backended method, the evaluation is * done under the current binding. However there can be no method. On such * situation this function evaluates in an isolated binding, like `require` * runs in a separate one. * * `__FILE__` will be `"(eval)"`, and `__LINE__` starts from 1 in the * evaluation. * * @param[in] str Ruby code to evaluate. * @exception rb_eException Raises an exception on error. * @return The evaluated result. * * @internal * * @shyouhei's old tale about the birth and growth of this function: * * At the beginning, there was no rb_eval_string(). @shyouhei heard that * @shugo, author of Apache httpd's mod_ruby module, requested @matz for this * API. He wanted a way so that mod_ruby can evaluate ruby scripts one by one, * separately, in each different contexts. So this function was made. It was * designed to be a global interpreter entry point like ruby_run_node(). * * The way it is implemented however allows extension libraries (not just * programs like Apache httpd) to call this function. Because its name says * nothing about the initial design, people started to think of it as an * orthodox way to call ruby level `eval` method from their extension * libraries. Even our `extension.rdoc` has had a description of this function * basically according to this understanding. * * The old (mod_ruby like) usage still works. But over time, usages of this * function from extension libraries got popular, while mod_ruby faded out; is * no longer maintained now. Devs decided to actively support both. This * function now auto-detects how it is called, and switches how it works * depending on it. * * @see https://bugs.ruby-lang.org/issues/18780 */ VALUE rb_eval_string(const char *str); RBIMPL_ATTR_NONNULL((1)) /** * Identical to rb_eval_string(), except it avoids potential global escapes. * Such global escapes include exceptions, `throw`, `break`, for example. * * It first evaluates the given string as rb_eval_string() does. If no global * escape occurred during the evaluation, it returns the result and `*state` is * zero. Otherwise, it returns some undefined value and sets `*state` to * nonzero. If state is `NULL`, it is not set in both cases. * * @param[in] str Ruby code to evaluate. * @param[out] state State of execution. * @return The evaluated result if succeeded, an undefined value if * otherwise. * @post `*state` is set to zero if succeeded. Nonzero otherwise. * @warning You have to clear the error info with `rb_set_errinfo(Qnil)` if * you decide to ignore the caught exception. * @see rb_eval_string * @see rb_protect * * @internal * * The "undefined value" described above is in fact ::RUBY_Qnil for now. But * @shyouhei doesn't think that we would never change that. * * Though not a part of our public API, `state` is in fact an * enum ruby_tag_type. You can see the potential "nonzero" values by looking * at vm_core.h. */ VALUE rb_eval_string_protect(const char *str, int *state); RBIMPL_ATTR_NONNULL((1)) /** * Identical to rb_eval_string_protect(), except it evaluates the given string * under a module binding in an isolated binding. This is the same as a * binding for loaded libraries on `rb_load(something, true)`. * * @param[in] str Ruby code to evaluate. * @param[out] state State of execution. * @return The evaluated result if succeeded, an undefined value if * otherwise. * @post `*state` is set to zero if succeeded. Nonzero otherwise. * @warning You have to clear the error info with `rb_set_errinfo(Qnil)` if * you decide to ignore the caught exception. * @see rb_eval_string */ VALUE rb_eval_string_wrap(const char *str, int *state); /** * Calls a method. Can call both public and private methods. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] n Number of arguments that follow. * @param[in] ... Arbitrary number of method arguments. * @exception rb_eNoMethodError No such method. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcall(VALUE recv, ID mid, int n, ...); /** * Identical to rb_funcall(), except it takes the method arguments as a C * array. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @exception rb_eNoMethodError No such method. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcallv(VALUE recv, ID mid, int argc, const VALUE *argv); /** * Identical to rb_funcallv(), except you can specify how to handle the last * element of the given array. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @param[in] kw_splat Handling of keyword parameters: * - RB_NO_KEYWORDS `argv`'s last is not a keyword argument. * - RB_PASS_KEYWORDS `argv`'s last is a keyword argument. * - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block. * @exception rb_eNoMethodError No such method. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcallv_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat); /** * Identical to rb_funcallv(), except it only takes public methods into * account. This is roughly Ruby's `Object#public_send`. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @exception rb_eNoMethodError No such method. * @exception rb_eNoMethodError The method is private or protected. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcallv_public(VALUE recv, ID mid, int argc, const VALUE *argv); /** * Identical to rb_funcallv_public(), except you can specify how to handle the * last element of the given array. It can also be seen as a routine identical * to rb_funcallv_kw(), except it only takes public methods into account. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @param[in] kw_splat Handling of keyword parameters: * - RB_NO_KEYWORDS `argv`'s last is not a keyword argument. * - RB_PASS_KEYWORDS `argv`'s last is a keyword argument. * - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block. * @exception rb_eNoMethodError No such method. * @exception rb_eNoMethodError The method is private or protected. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcallv_public_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat); /** * @deprecated This is an old name of rb_funcallv(). Provided here for * backwards compatibility to 2.x programs (introduced in 2.1). * It is not a good name. Please don't use it any longer. */ #define rb_funcall2 rb_funcallv /** * @deprecated This is an old name of rb_funcallv_public(). Provided here * for backwards compatibility to 2.x programs (introduced in * 2.1). It is not a good name. Please don't use it any longer. */ #define rb_funcall3 rb_funcallv_public /** * Identical to rb_funcallv_public(), except you can pass the passed block. * * Sometimes you want to "pass" a block parameter form one method to another. * Suppose you have this Ruby method `foo`: * * ```ruby * def foo(x, y, &z) * x.open(y, &z) * end * ``` * * And suppose you want to translate this into C. Then * rb_funcall_passing_block() function is usable in this situation. * * ```CXX * VALUE * foo_translated_into_C(VALUE self, VALUE x, VALUE y) * { * const auto open = rb_intern("open"); * * return rb_funcall_passing_block(x, open, 1, &y); * } * ``` * * @see rb_yield_block * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @exception rb_eNoMethodError No such method. * @exception rb_eNoMethodError The method is private or protected. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcall_passing_block(VALUE recv, ID mid, int argc, const VALUE *argv); /** * Identical to rb_funcallv_passing_block(), except you can specify how to * handle the last element of the given array. It can also be seen as a * routine identical to rb_funcallv_public_kw(), except you can pass the passed * block. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @param[in] kw_splat Handling of keyword parameters: * - RB_NO_KEYWORDS `argv`'s last is not a keyword argument. * - RB_PASS_KEYWORDS `argv`'s last is a keyword argument. * - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block. * @exception rb_eNoMethodError No such method. * @exception rb_eNoMethodError The method is private or protected. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcall_passing_block_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat); /** * Identical to rb_funcallv_public(), except you can pass a block. A block * here basically is an instance of ::rb_cProc. If you want to exercise * `to_proc` conversion, do so before passing it here. However nil and symbols * are special-case allowed. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @param[in] procval An instance of Proc, Symbol, or NilClass. * @exception rb_eNoMethodError No such method. * @exception rb_eNoMethodError The method is private or protected. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. * * @internal * * Implementation-wise, `procval` is in fact a "block handler" object. You * could also pass an IFUNC (block_handler_ifunc) here to say precise. --- But * AFAIK there is no 3rd party way to even know that there are objects called * IFUNC behind-the-scene. */ VALUE rb_funcall_with_block(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE procval); /** * Identical to rb_funcallv_with_block(), except you can specify how to handle * the last element of the given array. It can also be seen as a routine * identical to rb_funcallv_public_kw(), except you can pass a block. * * @param[in,out] recv Receiver of the method. * @param[in] mid Name of the method to call. * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @param[in] procval An instance of Proc, Symbol, or NilClass. * @param[in] kw_splat Handling of keyword parameters: * - RB_NO_KEYWORDS `argv`'s last is not a keyword argument. * - RB_PASS_KEYWORDS `argv`'s last is a keyword argument. * - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block. * @exception rb_eNoMethodError No such method. * @exception rb_eNoMethodError The method is private or protected. * @exception rb_eException Any exceptions happen inside. * @return What the method evaluates to. */ VALUE rb_funcall_with_block_kw(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE procval, int kw_splat); /** * This resembles ruby's `super`. * * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @exception rb_eNoMethodError No super method are there. * @exception rb_eException Any exceptions happen inside. * @return What the super method evaluates to. */ VALUE rb_call_super(int argc, const VALUE *argv); /** * Identical to rb_call_super(), except you can specify how to handle the last * element of the given array. * * @param[in] argc Number of arguments. * @param[in] argv Arbitrary number of method arguments. * @param[in] kw_splat Handling of keyword parameters: * - RB_NO_KEYWORDS `argv`'s last is not a keyword argument. * - RB_PASS_KEYWORDS `argv`'s last is a keyword argument. * - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block. * @exception rb_eNoMethodError No super method are there. * @exception rb_eException Any exceptions happen inside. * @return What the super method evaluates to. */ VALUE rb_call_super_kw(int argc, const VALUE *argv, int kw_splat); /** * This resembles ruby's `self`. * * @exception rb_eRuntimeError Called from outside of method context. * @return Current receiver. */ VALUE rb_current_receiver(void); RBIMPL_ATTR_NONNULL((2)) /** * Keyword argument deconstructor. * * Retrieves argument values bound to keywords, which directed by `table` into * `values`, deleting retrieved entries from `keyword_hash` along the way. * First `required` number of IDs referred by `table` are mandatory, and * succeeding `optional` (`-optional-1` if `optional` is negative) number of * IDs are optional. If a mandatory key is not contained in `keyword_hash`, * raises ::rb_eArgError. If an optional key is not present in `keyword_hash`, * the corresponding element in `values` is set to ::RUBY_Qundef. If * `optional` is negative, rest of `keyword_hash` are ignored, otherwise raises * ::rb_eArgError. * * @warning Handling keyword arguments in the C API is less efficient than * handling them in Ruby. Consider using a Ruby wrapper method * around a non-keyword C function. * @see https://bugs.ruby-lang.org/issues/11339 * @param[out] keyword_hash Target hash to deconstruct. * @param[in] table List of keywords that you are interested in. * @param[in] required Number of mandatory keywords. * @param[in] optional Number of optional keywords (can be negative). * @param[out] values Buffer to be filled. * @exception rb_eArgError Absence of a mandatory keyword. * @exception rb_eArgError Found an unknown keyword. * @return Number of found values that are stored into `values`. */ int rb_get_kwargs(VALUE keyword_hash, const ID *table, int required, int optional, VALUE *values); RBIMPL_ATTR_NONNULL(()) /** * Splits a hash into two. * * Takes a hash of various keys, and split it into symbol-keyed parts and * others. Symbol-keyed part becomes the return value. What remains are * returned as a new hash object stored at the argument pointer. * * @param[in,out] orighash Pointer to a target hash to split. * @return An extracted keyword hash. * @post Upon successful return `orighash` points to another hash * object, whose contents are the remainder of the operation. * @note The argument hash object is not modified. */ VALUE rb_extract_keywords(VALUE *orighash); RBIMPL_SYMBOL_EXPORT_END() #endif /* RBIMPL_EVAL_H */