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#ifndef RBIMPL_INTERN_VM_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_INTERN_VM_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 Public APIs related to rb_cRubyVM.
*/
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/attr/noreturn.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
/* vm.c */
/**
* Resembles `__LINE__`.
*
* @retval 0 Current execution context not in a ruby method.
* @retval otherwise The current line number of the current thread of the
* current ractor of the current execution context.
*/
int rb_sourceline(void);
/**
* Resembles `__FILE__`.
*
* @retval 0 Current execution context not in a ruby method.
* @retval otherwise The current source path of the current thread of the
* current ractor of the current execution context.
* @note This may or may not be an absolute path.
*/
const char *rb_sourcefile(void);
/**
* Resembles `__method__`.
*
* @param[out] idp Return buffer for method id.
* @param[out] klassp Return buffer for class.
* @retval 0 Current execution context not in a method.
* @retval 1 Successful return.
* @post Upon successful return `*idp` and `*klassp` are updated to have
* the current method name and its defined class respectively.
* @note Both parameters can be `NULL`.
*/
int rb_frame_method_id_and_class(ID *idp, VALUE *klassp);
/* vm_eval.c */
/**
* Identical to rb_funcallv(), except it returns ::RUBY_Qundef instead of
* raising ::rb_eNoMethodError.
*
* @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.
* @retval RUBY_Qundef `recv` doesn't respond to `mid`.
* @retval otherwise What the method evaluates to.
*/
VALUE rb_check_funcall(VALUE recv, ID mid, int argc, const VALUE *argv);
/**
* Identical to rb_check_funcall(), 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 returns ::RUBY_Qundef instead of raising
* ::rb_eNoMethodError.
*
* @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.
* @retval RUBY_Qundef `recv` doesn't respond to `mid`.
* @retval otherwise What the method evaluates to.
*/
VALUE rb_check_funcall_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat);
/**
* This API is practically a variant of rb_proc_call_kw() now. Historically
* when there still was a concept called `$SAFE`, this was an API for that.
* But we no longer have that. This function basically ended its role. It
* just remains here because of no harm.
*
* @param[in] cmd A string, or something callable.
* @param[in] arg Argument passed to the call.
* @param[in] kw_splat Handling of keyword parameters:
* - RB_NO_KEYWORDS `arg`'s last is not a keyword argument.
* - RB_PASS_KEYWORDS `arg`'s last is a keyword argument.
* - RB_PASS_CALLED_KEYWORDS it depends if there is a passed block.
* @return What the command evaluates to.
*/
VALUE rb_eval_cmd_kw(VALUE cmd, VALUE arg, int kw_splat);
/**
* Identical to rb_funcallv(), except it takes Ruby's array instead of C's.
* @param[in,out] recv Receiver of the method.
* @param[in] mid Name of the method to call.
* @param[in] args An instance of ::RArray.
* @exception rb_eNoMethodError No such method.
* @exception rb_eException Any exceptions happen inside.
* @return What the method evaluates to.
* @pre `args` must be an ::RArray. Call `to_ary` beforehand when
* necessary.
*/
VALUE rb_apply(VALUE recv, ID mid, VALUE args);
/**
* Evaluates a string containing Ruby source code, or the given block, within
* the context of the receiver. In order to set the context, the variable
* `self` is set to `recv` while the code is executing, giving the code access
* to `recv`'s instance variables and private methods.
*
* When given a block, `recv` is also passed in as the block's only argument.
*
* When given a string, the optional second and third parameters supply a
* filename and starting line number that are used when reporting compilation
* errors.
*
* @param[in] argc Number of objects in `argv`
* @param[in] argv C array of 0 up to 3 elements.
* @param[in] recv The object in question.
* @return What was evaluated.
*/
VALUE rb_obj_instance_eval(int argc, const VALUE *argv, VALUE recv);
/**
* Executes the given block within the context of the receiver. In order to
* set the context, the variable `self` is set to `recv` while the code is
* executing, giving the code access to `recv`'s instance variables. Arguments
* are passed as block parameters.
*
* @param[in] argc Number of objects in `argv`
* @param[in] argv Arbitrary parameters to be passed to the block.
* @param[in] recv The object in question.
* @return What was evaluated.
* @note Don't confuse this with rb_obj_instance_eval(). The key
* difference is whether you can pass arbitrary parameters to the
* block, like this:
*
* ```ruby
* class Foo
* def initialize
* @foo = 5
* end
* end
* Foo.new.instance_exec(7) {|i| @foo + i } # => 12
* ```
*/
VALUE rb_obj_instance_exec(int argc, const VALUE *argv, VALUE recv);
/**
* Identical to rb_obj_instance_eval(), except it evaluates within the context
* of module.
*
* @param[in] argc Number of objects in `argv`
* @param[in] argv C array of 0 up to 3 elements.
* @param[in] mod The module in question.
* @pre `mod` must be a Module.
* @return What was evaluated.
*/
VALUE rb_mod_module_eval(int argc, const VALUE *argv, VALUE mod);
/**
* Identical to rb_obj_instance_exec(), except it evaluates within the context
* of module.
*
* @param[in] argc Number of objects in `argv`
* @param[in] argv Arbitrary parameters to be passed to the block.
* @param[in] mod The module in question.
* @pre `mod` must be a Module.
* @return What was evaluated.
*/
VALUE rb_mod_module_exec(int argc, const VALUE *argv, VALUE mod);
/* vm_method.c */
/**
* @private
*
* @deprecated This macro once was a thing in the old days, but makes no sense
* any longer today. Exists here for backwards compatibility
* only. You can safely forget about it.
*/
#define HAVE_RB_DEFINE_ALLOC_FUNC 1
/**
* This is the type of functions that ruby calls when trying to allocate an
* object. It is sometimes necessary to allocate extra memory regions for an
* object. When you define a class that uses ::RTypedData, it is typically the
* case. On such situations define a function of this type and pass it to
* rb_define_alloc_func().
*
* @param[in] klass The class that this function is registered.
* @return A newly allocated instance of `klass`.
*/
typedef VALUE (*rb_alloc_func_t)(VALUE klass);
/**
* Sets the allocator function of a class.
*
* @param[out] klass The class to modify.
* @param[in] func An allocator function for the class.
* @pre `klass` must be an instance of Class.
*/
void rb_define_alloc_func(VALUE klass, rb_alloc_func_t func);
/**
* Deletes the allocator function of a class. It is sometimes desirable to
* restrict creation of an instance of a class. For example it rarely makes
* sense for a DB adaptor class to allow programmers creating DB row objects
* without querying the DB itself. You can kill sporadic creation of such
* objects then, by nullifying the allocator function using this API. Your
* object shall be allocated using #RB_NEWOBJ_OF() directly.
*
* @param[out] klass The class to modify.
* @pre `klass` must be an instance of Class.
*/
void rb_undef_alloc_func(VALUE klass);
/**
* Queries the allocator function of a class.
*
* @param[in] klass The class in question.
* @pre `klass` must be an instance of Class.
* @retval 0 No allocator function is registered.
* @retval otherwise The allocator function.
*
* @internal
*
* Who cares? @shyouhei fins no practical usage of the return value. Maybe we
* need KonMari.
*/
rb_alloc_func_t rb_get_alloc_func(VALUE klass);
/**
* Clears the constant cache. Extension libraries should not bother such
* things. Just forget about this API (or even, the presence of constant
* cache).
*
* @internal
*
* Completely no idea why this function is defined in vm_method.c.
*/
void rb_clear_constant_cache(void);
/**
* Resembles `alias`.
*
* @param[out] klass Where to define an alias.
* @param[in] dst New name.
* @param[in] src Existing name.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eFrozenError `klass` is frozen.
* @exception rb_eNameError No such method named `src`.
* @post `klass` has a method named `dst`, which is the identical to its
* method named `src`.
*/
void rb_alias(VALUE klass, ID dst, ID src);
/**
* This function resembles now-deprecated `Module#attr`.
*
* @param[out] klass Where to define an attribute.
* @param[in] name Name of an instance variable.
* @param[in] need_reader Whether attr_reader is needed.
* @param[in] need_writer Whether attr_writer is needed.
* @param[in] honour_visibility Whether to use the current visibility.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eFrozenError `klass` is frozen.
* @post If `need_reader` is set `klass` has a method named `name`.
* @post If `need_writer` is set `klass` has a method named `name=`.
*
* @internal
*
* The three `int` arguments should have been bool, but there was no such thing
* like a bool when K&R was used in this project.
*/
void rb_attr(VALUE klass, ID name, int need_reader, int need_writer, int honour_visibility);
RBIMPL_ATTR_NONNULL(())
/**
* Removes a method. Don't confuse this to rb_undef_method(), which doesn't
* remove a method. This one resembles `Module#remove_method`.
*
* @param[out] klass The class to remove a method.
* @param[in] name Name of a method to be removed.
* @exception rb_eTypeError `klass` is a non-module.
* @exception rb_eFrozenError `klass` is frozen.
* @exception rb_eNameError No such method.
* @see rb_undef_method
*/
void rb_remove_method(VALUE klass, const char *name);
/**
* Identical to rb_remove_method(), except it accepts the method name as ::ID.
*
* @param[out] klass The class to remove a method.
* @param[in] mid Name of a method to be removed.
* @exception rb_eTypeError `klass` is a non-module.
* @exception rb_eFrozenError `klass` is frozen.
* @exception rb_eNameError No such method.
* @see rb_undef
*/
void rb_remove_method_id(VALUE klass, ID mid);
/**
* Queries if the klass has this method. This function has only one line of
* document in the implementation that states "// deprecated". Don't know what
* that means though.
*
* @param[in] klass The class in question.
* @param[in] id The method name to query.
* @param[in] ex Undocumented magic value.
* @retval false Method not found.
* @retval true There is a method.
* @pre `klass` must be a module.
*
* @internal
*
* @shyouhei has no motivation to describe what should be passed to `ex`. It
* seems this function should just be trashed.
*/
int rb_method_boundp(VALUE klass, ID id, int ex);
/**
* Well... Let us hesitate from describing what a "basic definition" is. This
* nuanced concept should have been kept private. Just please. Don't touch
* it. This function is a badly distributed random number generator. Right?
*
* @param[in] klass The class in question.
* @param[in] mid The method name in question.
* @retval 1 It is.
* @retval 0 It isn't.
*/
int rb_method_basic_definition_p(VALUE klass, ID mid);
/**
* Identical to rb_respond_to(), except it additionally takes the visibility
* parameter. This does not make difference unless the object has
* `respond_to?` undefined, but has `respond_to_missing?` defined. That case
* the passed argument becomes the second argument of `respond_to_missing?`.
*
* @param[in] obj The object in question.
* @param[in] mid The method name in question.
* @param[in] private_p This is the second argument of `obj`'s
* `respond_to_missing?`.
* @retval 1 Yes it does.
* @retval 0 No it doesn't.
*/
int rb_obj_respond_to(VALUE obj, ID mid, int private_p);
/**
* Queries if the object responds to the method. This involves calling the
* object's `respond_to?` method.
*
* @param[in] obj The object in question.
* @param[in] mid The method name in question.
* @retval 1 Yes it does.
* @retval 0 No it doesn't.
*/
int rb_respond_to(VALUE obj, ID mid);
RBIMPL_ATTR_NORETURN()
/**
* Raises ::rb_eNotImpError. This function is used as an argument to
* rb_define_method() etc.
*
* ```CXX
* rb_define_method(rb_cFoo, "foo", rb_f_notimplement, -1);
* ```
*
* @param argc Unused parameter.
* @param argv Unused parameter.
* @param obj Unused parameter.
* @param marker Unused parameter.
* @exception rb_eNotImpError Always.
* @return Never returns.
*
* @internal
*
* See also the Q&A section of include/ruby/internal/anyargs.h.
*/
VALUE rb_f_notimplement(int argc, const VALUE *argv, VALUE obj, VALUE marker);
#if !defined(RUBY_EXPORT) && defined(_WIN32)
RUBY_EXTERN VALUE (*const rb_f_notimplement_)(int, const VALUE *, VALUE, VALUE marker);
#define rb_f_notimplement (*rb_f_notimplement_)
#endif
/* vm_backtrace.c */
/**
* Prints the backtrace out to the standard error. This just confuses people
* for no reason. Evil souls must only use it.
*
* @internal
*
* Actually it is very useful when called from an interactive GDB session.
*/
void rb_backtrace(void);
/**
* Creates the good old fashioned array-of-strings style backtrace info.
*
* @return An array which contains strings, which are the textual
* representations of the backtrace locations of the current thread of
* the current ractor of the current execution context.
* @note Ruby scripts can access more sophisticated
* `Thread::Backtrace::Location`. But it seems there is no way for C
* extensions to use that API.
*/
VALUE rb_make_backtrace(void);
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_INTERN_VM_H */