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#ifndef RBIMPL_RSTRING_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_RSTRING_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 Defines struct ::RString.
*/
#include "ruby/internal/config.h"
#include "ruby/internal/arithmetic/long.h"
#include "ruby/internal/attr/artificial.h"
#include "ruby/internal/attr/pure.h"
#include "ruby/internal/cast.h"
#include "ruby/internal/core/rbasic.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/fl_type.h"
#include "ruby/internal/value_type.h"
#include "ruby/internal/warning_push.h"
#include "ruby/assert.h"
#define RSTRING(obj) RBIMPL_CAST((struct RString *)(obj))
#define RSTRING_NOEMBED RSTRING_NOEMBED
#define RSTRING_EMBED_LEN_MASK RSTRING_EMBED_LEN_MASK
#define RSTRING_EMBED_LEN_SHIFT RSTRING_EMBED_LEN_SHIFT
#define RSTRING_EMBED_LEN_MAX RSTRING_EMBED_LEN_MAX
#define RSTRING_FSTR RSTRING_FSTR
/** @cond INTERNAL_MACRO */
#define RSTRING_EMBED_LEN RSTRING_EMBED_LEN
#define RSTRING_LEN RSTRING_LEN
#define RSTRING_LENINT RSTRING_LENINT
#define RSTRING_PTR RSTRING_PTR
#define RSTRING_END RSTRING_END
/** @endcond */
#define StringValue(v) rb_string_value(&(v))
#define StringValuePtr(v) rb_string_value_ptr(&(v))
#define StringValueCStr(v) rb_string_value_cstr(&(v))
#define SafeStringValue(v) StringValue(v)
#define ExportStringValue(v) do { \
StringValue(v); \
(v) = rb_str_export(v); \
} while (0)
enum ruby_rstring_flags {
RSTRING_NOEMBED = RUBY_FL_USER1,
RSTRING_EMBED_LEN_MASK = RUBY_FL_USER2 | RUBY_FL_USER3 | RUBY_FL_USER4 |
RUBY_FL_USER5 | RUBY_FL_USER6,
/* Actually, string encodings are also encoded into the flags, using
* remaining bits.*/
RSTRING_FSTR = RUBY_FL_USER17
};
enum ruby_rstring_consts {
RSTRING_EMBED_LEN_SHIFT = RUBY_FL_USHIFT + 2,
RSTRING_EMBED_LEN_MAX = RBIMPL_EMBED_LEN_MAX_OF(char) - 1
};
struct RString {
struct RBasic basic;
union {
struct {
long len;
char *ptr;
union {
long capa;
VALUE shared;
} aux;
} heap;
char ary[RSTRING_EMBED_LEN_MAX + 1];
} as;
};
RBIMPL_SYMBOL_EXPORT_BEGIN()
VALUE rb_str_to_str(VALUE);
VALUE rb_string_value(volatile VALUE*);
char *rb_string_value_ptr(volatile VALUE*);
char *rb_string_value_cstr(volatile VALUE*);
VALUE rb_str_export(VALUE);
VALUE rb_str_export_locale(VALUE);
RBIMPL_ATTR_ERROR(("rb_check_safe_str() and Check_SafeStr() are obsolete; use StringValue() instead"))
void rb_check_safe_str(VALUE);
#define Check_SafeStr(v) rb_check_safe_str(RBIMPL_CAST((VALUE)(v)))
RBIMPL_SYMBOL_EXPORT_END()
RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
static inline long
RSTRING_EMBED_LEN(VALUE str)
{
RBIMPL_ASSERT_TYPE(str, RUBY_T_STRING);
RBIMPL_ASSERT_OR_ASSUME(! RB_FL_ANY_RAW(str, RSTRING_NOEMBED));
VALUE f = RBASIC(str)->flags;
f &= RSTRING_EMBED_LEN_MASK;
f >>= RSTRING_EMBED_LEN_SHIFT;
return RBIMPL_CAST((long)f);
}
RBIMPL_WARNING_PUSH()
#if RBIMPL_COMPILER_IS(Intel)
RBIMPL_WARNING_IGNORED(413)
#endif
RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
static inline struct RString
rbimpl_rstring_getmem(VALUE str)
{
RBIMPL_ASSERT_TYPE(str, RUBY_T_STRING);
if (RB_FL_ANY_RAW(str, RSTRING_NOEMBED)) {
return *RSTRING(str);
}
else {
/* Expecting compilers to optimize this on-stack struct away. */
struct RString retval;
retval.as.heap.len = RSTRING_EMBED_LEN(str);
retval.as.heap.ptr = RSTRING(str)->as.ary;
return retval;
}
}
RBIMPL_WARNING_POP()
RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
static inline long
RSTRING_LEN(VALUE str)
{
return rbimpl_rstring_getmem(str).as.heap.len;
}
RBIMPL_ATTR_ARTIFICIAL()
static inline char *
RSTRING_PTR(VALUE str)
{
char *ptr = rbimpl_rstring_getmem(str).as.heap.ptr;
if (RB_UNLIKELY(! ptr)) {
/* :BEWARE: @shyouhei thinks that currently, there are rooms for this
* function to return NULL. In the 20th century that was a pointless
* concern. However struct RString can hold fake strings nowadays. It
* seems no check against NULL are exercised around handling of them
* (one of such usages is located in marshal.c, which scares
* @shyouhei). Better check here for maximum safety.
*
* Also, this is not rb_warn() because RSTRING_PTR() can be called
* during GC (see what obj_info() does). rb_warn() needs to allocate
* Ruby objects. That is not possible at this moment. */
fprintf(stderr, "%s\n",
"RSTRING_PTR is returning NULL!! "
"SIGSEGV is highly expected to follow immediately. "
"If you could reproduce, attach your debugger here, "
"and look at the passed string."
);
}
return ptr;
}
RBIMPL_ATTR_ARTIFICIAL()
static inline char *
RSTRING_END(VALUE str)
{
struct RString buf = rbimpl_rstring_getmem(str);
if (RB_UNLIKELY(! buf.as.heap.ptr)) {
/* Ditto. */
fprintf(stderr, "%s\n",
"RSTRING_END is returning NULL!! "
"SIGSEGV is highly expected to follow immediately. "
"If you could reproduce, attach your debugger here, "
"and look at the passed string."
);
}
return &buf.as.heap.ptr[buf.as.heap.len];
}
RBIMPL_ATTR_ARTIFICIAL()
static inline int
RSTRING_LENINT(VALUE str)
{
return rb_long2int(RSTRING_LEN(str));
}
#ifdef HAVE_STMT_AND_DECL_IN_EXPR
# define RSTRING_GETMEM(str, ptrvar, lenvar) \
__extension__ ({ \
struct RString rbimpl_str = rbimpl_rstring_getmem(str); \
(ptrvar) = rbimpl_str.as.heap.ptr; \
(lenvar) = rbimpl_str.as.heap.len; \
})
#else
# define RSTRING_GETMEM(str, ptrvar, lenvar) \
((ptrvar) = RSTRING_PTR(str), \
(lenvar) = RSTRING_LEN(str))
#endif /* HAVE_STMT_AND_DECL_IN_EXPR */
#endif /* RBIMPL_RSTRING_H */