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Edit File : scan_args.h \| Size : 13.50 KB
#ifndef RBIMPL_SCAN_ARGS_H /--C++--vi:se ft=cpp:/ #define RBIMPL_SCAN_ARGS_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 Compile-time static implementation of ::rb_scan_args(). * * This is a beast. It statically analyses the argument spec string, and * expands the assignment of variables into dedicated codes. / #include "ruby/internal/attr/diagnose_if.h" #include "ruby/internal/attr/error.h" #include "ruby/internal/attr/forceinline.h" #include "ruby/internal/attr/noreturn.h" #include "ruby/internal/config.h" #include "ruby/internal/dllexport.h" #include "ruby/internal/has/attribute.h" #include "ruby/internal/intern/array.h" / rb_ary_new_from_values / #include "ruby/internal/intern/error.h" / rb_error_arity / #include "ruby/internal/intern/hash.h" / rb_hash_dup / #include "ruby/internal/intern/proc.h" / rb_block_proc / #include "ruby/internal/iterator.h" / rb_block_given_p / rb_keyword_given_p / #include "ruby/internal/static_assert.h" #include "ruby/internal/stdbool.h" #include "ruby/internal/value.h" #include "ruby/assert.h" #define RB_SCAN_ARGS_PASS_CALLED_KEYWORDS 0 #define RB_SCAN_ARGS_KEYWORDS 1 #define RB_SCAN_ARGS_LAST_HASH_KEYWORDS 3 #define RB_NO_KEYWORDS 0 #define RB_PASS_KEYWORDS 1 #define RB_PASS_CALLED_KEYWORDS rb_keyword_given_p() / rb_scan_args() format allows ':' for optional hash / #define HAVE_RB_SCAN_ARGS_OPTIONAL_HASH 1 RBIMPL_SYMBOL_EXPORT_BEGIN() int rb_scan_args(int, const VALUE, const char, ...); int rb_scan_args_kw(int, int, const VALUE, const char, ...); RBIMPL_ATTR_ERROR(("bad scan arg format")) void rb_scan_args_bad_format(const char); RBIMPL_ATTR_ERROR(("variable argument length doesn't match")) void rb_scan_args_length_mismatch(const char,int); RBIMPL_SYMBOL_EXPORT_END() / If we could use constexpr the following macros could be inline functions * ... but sadly we cannot. / #define rb_scan_args_isdigit(c) (RBIMPL_CAST((unsigned char)((c)-'0'))<10) #define rb_scan_args_count_end(fmt, ofs, vari) \ ((fmt)[ofs] ? -1 : (vari)) #define rb_scan_args_count_block(fmt, ofs, vari) \ ((fmt)[ofs]!='&' ? \ rb_scan_args_count_end(fmt, ofs, vari) : \ rb_scan_args_count_end(fmt, (ofs)+1, (vari)+1)) #define rb_scan_args_count_hash(fmt, ofs, vari) \ ((fmt)[ofs]!=':' ? \ rb_scan_args_count_block(fmt, ofs, vari) : \ rb_scan_args_count_block(fmt, (ofs)+1, (vari)+1)) #define rb_scan_args_count_trail(fmt, ofs, vari) \ (!rb_scan_args_isdigit((fmt)[ofs]) ? \ rb_scan_args_count_hash(fmt, ofs, vari) : \ rb_scan_args_count_hash(fmt, (ofs)+1, (vari)+((fmt)[ofs]-'0'))) #define rb_scan_args_count_var(fmt, ofs, vari) \ ((fmt)[ofs]!='' ? \ rb_scan_args_count_trail(fmt, ofs, vari) : \ rb_scan_args_count_trail(fmt, (ofs)+1, (vari)+1)) #define rb_scan_args_count_opt(fmt, ofs, vari) \ (!rb_scan_args_isdigit((fmt)[ofs]) ? \ rb_scan_args_count_var(fmt, ofs, vari) : \ rb_scan_args_count_var(fmt, (ofs)+1, (vari)+(fmt)[ofs]-'0')) #define rb_scan_args_count_lead(fmt, ofs, vari) \ (!rb_scan_args_isdigit((fmt)[ofs]) ? \ rb_scan_args_count_var(fmt, ofs, vari) : \ rb_scan_args_count_opt(fmt, (ofs)+1, (vari)+(fmt)[ofs]-'0')) #define rb_scan_args_count(fmt) rb_scan_args_count_lead(fmt, 0, 0) #if RBIMPL_HAS_ATTRIBUTE(diagnose_if) # /* Assertions done in the attribute. / # define rb_scan_args_verify(fmt, varc) RBIMPL_ASSERT_NOTHING #else # / At one sight it _seems_ the expressions below could be written using # * static assrtions. The reality is no, they don't. Because fmt is a string # * literal, any operations against fmt cannot produce the "integer constant # * expression"s, as defined in ISO/IEC 9899:2018 section 6.6 paragraph #6. # * Static assertions need such integer constant expressions as defined in # * ISO/IEC 9899:2018 section 6.7.10 paragraph #3. # * # * GCC nonetheless constant-folds this into no-op, though. / # define rb_scan_args_verify(fmt, varc) \ (sizeof(char[1-2(rb_scan_args_count(fmt)<0)])!=1 ? \ rb_scan_args_bad_format(fmt) : \ sizeof(char[1-2(rb_scan_args_count(fmt)!=(varc))])!=1 ? \ rb_scan_args_length_mismatch(fmt, varc) : \ RBIMPL_ASSERT_NOTHING) #endif static inline bool rb_scan_args_keyword_p(int kw_flag, VALUE last) { switch (kw_flag) { case RB_SCAN_ARGS_PASS_CALLED_KEYWORDS: return !! rb_keyword_given_p(); case RB_SCAN_ARGS_KEYWORDS: return true; case RB_SCAN_ARGS_LAST_HASH_KEYWORDS: return RB_TYPE_P(last, T_HASH); default: return false; } } RBIMPL_ATTR_FORCEINLINE() static bool rb_scan_args_lead_p(const char fmt) { return rb_scan_args_isdigit(fmt[0]); } RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_n_lead(const char fmt) { return (rb_scan_args_lead_p(fmt) ? fmt[0]-'0' : 0); } RBIMPL_ATTR_FORCEINLINE() static bool rb_scan_args_opt_p(const char fmt) { return (rb_scan_args_lead_p(fmt) && rb_scan_args_isdigit(fmt[1])); } RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_n_opt(const char fmt) { return (rb_scan_args_opt_p(fmt) ? fmt[1]-'0' : 0); } RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_var_idx(const char fmt) { return (!rb_scan_args_lead_p(fmt) ? 0 : !rb_scan_args_isdigit(fmt[1]) ? 1 : 2); } RBIMPL_ATTR_FORCEINLINE() static bool rb_scan_args_f_var(const char fmt) { return (fmt[rb_scan_args_var_idx(fmt)]==''); } RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_trail_idx(const char fmt) { const int idx = rb_scan_args_var_idx(fmt); return idx+(fmt[idx]==''); } RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_n_trail(const char fmt) { const int idx = rb_scan_args_trail_idx(fmt); return (rb_scan_args_isdigit(fmt[idx]) ? fmt[idx]-'0' : 0); } RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_hash_idx(const char fmt) { const int idx = rb_scan_args_trail_idx(fmt); return idx+rb_scan_args_isdigit(fmt[idx]); } RBIMPL_ATTR_FORCEINLINE() static bool rb_scan_args_f_hash(const char fmt) { return (fmt[rb_scan_args_hash_idx(fmt)]==':'); } RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_block_idx(const char fmt) { const int idx = rb_scan_args_hash_idx(fmt); return idx+(fmt[idx]==':'); } RBIMPL_ATTR_FORCEINLINE() static bool rb_scan_args_f_block(const char fmt) { return (fmt[rb_scan_args_block_idx(fmt)]=='&'); } # if 0 RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_end_idx(const char fmt) { const int idx = rb_scan_args_block_idx(fmt); return idx+(fmt[idx]=='&'); } # endif /* NOTE: Use `char fmt` instead of `const char fmt` because of clang's bug/ / https://bugs.llvm.org/show_bug.cgi?id=38095 / # define rb_scan_args0(argc, argv, fmt, varc, vars) \ rb_scan_args_set(RB_SCAN_ARGS_PASS_CALLED_KEYWORDS, argc, argv, \ rb_scan_args_n_lead(fmt), \ rb_scan_args_n_opt(fmt), \ rb_scan_args_n_trail(fmt), \ rb_scan_args_f_var(fmt), \ rb_scan_args_f_hash(fmt), \ rb_scan_args_f_block(fmt), \ (rb_scan_args_verify(fmt, varc), vars), (char )fmt, varc) # define rb_scan_args_kw0(kw_flag, argc, argv, fmt, varc, vars) \ rb_scan_args_set(kw_flag, argc, argv, \ rb_scan_args_n_lead(fmt), \ rb_scan_args_n_opt(fmt), \ rb_scan_args_n_trail(fmt), \ rb_scan_args_f_var(fmt), \ rb_scan_args_f_hash(fmt), \ rb_scan_args_f_block(fmt), \ (rb_scan_args_verify(fmt, varc), vars), (char )fmt, varc) RBIMPL_ATTR_FORCEINLINE() static int rb_scan_args_set(int kw_flag, int argc, const VALUE argv, int n_lead, int n_opt, int n_trail, bool f_var, bool f_hash, bool f_block, VALUE vars[], RB_UNUSED_VAR(const char fmt), RB_UNUSED_VAR(int varc)) RBIMPL_ATTR_DIAGNOSE_IF(rb_scan_args_count(fmt) < 0, "bad scan arg format", "error") RBIMPL_ATTR_DIAGNOSE_IF(rb_scan_args_count(fmt) != varc, "variable argument length doesn't match", "error") { int i, argi = 0, vari = 0; VALUE var, hash = Qnil; #define rb_scan_args_next_param() vars[vari++] const int n_mand = n_lead + n_trail; / capture an option hash - phase 1: pop from the argv / if (f_hash && argc > 0) { VALUE last = argv[argc - 1]; if (rb_scan_args_keyword_p(kw_flag, last)) { hash = rb_hash_dup(last); argc--; } } if (argc < n_mand) { goto argc_error; } / capture leading mandatory arguments / for (i = 0; i < n_lead; i++) { var = rb_scan_args_next_param(); if (var) var = argv[argi]; argi++; } /* capture optional arguments / for (i = 0; i < n_opt; i++) { var = rb_scan_args_next_param(); if (argi < argc - n_trail) { if (var) var = argv[argi]; argi++; } else { if (var) var = Qnil; } } / capture variable length arguments / if (f_var) { int n_var = argc - argi - n_trail; var = rb_scan_args_next_param(); if (0 < n_var) { if (var) var = rb_ary_new_from_values(n_var, &argv[argi]); argi += n_var; } else { if (var) var = rb_ary_new(); } } / capture trailing mandatory arguments / for (i = 0; i < n_trail; i++) { var = rb_scan_args_next_param(); if (var) var = argv[argi]; argi++; } /* capture an option hash - phase 2: assignment / if (f_hash) { var = rb_scan_args_next_param(); if (var) var = hash; } /* capture iterator block / if (f_block) { var = rb_scan_args_next_param(); if (rb_block_given_p()) { var = rb_block_proc(); } else { var = Qnil; } } if (argi == argc) { return argc; } argc_error: rb_error_arity(argc, n_mand, f_var ? UNLIMITED_ARGUMENTS : n_mand + n_opt); UNREACHABLE_RETURN(-1); #undef rb_scan_args_next_param } #if ! defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P) # / skip / #elif ! defined(HAVE_VA_ARGS_MACRO) # / skip / #elif ! defined(__OPTIMIZE__) # / skip / #elif defined(HAVE___VA_OPT__) # define rb_scan_args(argc, argvp, fmt, ...) \ __builtin_choose_expr( \ __builtin_constant_p(fmt), \ rb_scan_args0( \ argc, argvp, fmt, \ (sizeof((VALUE[]){__VA_ARGS__})/sizeof(VALUE)), \ ((VALUE[]){__VA_ARGS__})), \ (rb_scan_args)(argc, argvp, fmt __VA_OPT__(, __VA_ARGS__))) # define rb_scan_args_kw(kw_flag, argc, argvp, fmt, ...) \ __builtin_choose_expr( \ __builtin_constant_p(fmt), \ rb_scan_args_kw0( \ kw_flag, argc, argvp, fmt, \ (sizeof((VALUE[]){__VA_ARGS__})/sizeof(VALUE)), \ ((VALUE[]){__VA_ARGS__})), \ (rb_scan_args_kw)(kw_flag, argc, argvp, fmt __VA_OPT__(, __VA_ARGS__))) #elif defined(__STRICT_ANSI__) # / skip / #elif defined(__GNUC__) # define rb_scan_args(argc, argvp, fmt, ...) \ __builtin_choose_expr( \ __builtin_constant_p(fmt), \ rb_scan_args0( \ argc, argvp, fmt, \ (sizeof((VALUE[]){__VA_ARGS__})/sizeof(VALUE)), \ ((VALUE[]){__VA_ARGS__})), \ (rb_scan_args)(argc, argvp, fmt, __VA_ARGS__)) # define rb_scan_args_kw(kw_flag, argc, argvp, fmt, ...) \ __builtin_choose_expr( \ __builtin_constant_p(fmt), \ rb_scan_args_kw0( \ kw_flag, argc, argvp, fmt, \ (sizeof((VALUE[]){__VA_ARGS__})/sizeof(VALUE)), \ ((VALUE[]){__VA_ARGS__})), \ (rb_scan_args_kw)(kw_flag, argc, argvp, fmt, __VA_ARGS__ //)) #endif #endif / RBIMPL_SCAN_ARGS_H */ Back

Edit File : scan_args.h | Size : 13.50 KB

#ifndef RBIMPL_SCAN_ARGS_H                           /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_SCAN_ARGS_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      Compile-time static implementation of ::rb_scan_args().
 *
 * This  is a  beast.  It  statically analyses  the argument  spec string,  and
 * expands the assignment of variables into dedicated codes.
 */
#include "ruby/internal/attr/diagnose_if.h"
#include "ruby/internal/attr/error.h"
#include "ruby/internal/attr/forceinline.h"
#include "ruby/internal/attr/noreturn.h"
#include "ruby/internal/config.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/has/attribute.h"
#include "ruby/internal/intern/array.h" /* rb_ary_new_from_values */
#include "ruby/internal/intern/error.h" /* rb_error_arity */
#include "ruby/internal/intern/hash.h"  /* rb_hash_dup */
#include "ruby/internal/intern/proc.h"  /* rb_block_proc */
#include "ruby/internal/iterator.h"     /* rb_block_given_p / rb_keyword_given_p */
#include "ruby/internal/static_assert.h"
#include "ruby/internal/stdbool.h"
#include "ruby/internal/value.h"
#include "ruby/assert.h"

#define RB_SCAN_ARGS_PASS_CALLED_KEYWORDS 0
#define RB_SCAN_ARGS_KEYWORDS 1
#define RB_SCAN_ARGS_LAST_HASH_KEYWORDS 3
#define RB_NO_KEYWORDS 0
#define RB_PASS_KEYWORDS 1
#define RB_PASS_CALLED_KEYWORDS rb_keyword_given_p()
/* rb_scan_args() format allows ':' for optional hash */
#define HAVE_RB_SCAN_ARGS_OPTIONAL_HASH 1

RBIMPL_SYMBOL_EXPORT_BEGIN()
int rb_scan_args(int, const VALUE*, const char*, ...);
int rb_scan_args_kw(int, int, const VALUE*, const char*, ...);

RBIMPL_ATTR_ERROR(("bad scan arg format"))
void rb_scan_args_bad_format(const char*);

RBIMPL_ATTR_ERROR(("variable argument length doesn't match"))
void rb_scan_args_length_mismatch(const char*,int);

RBIMPL_SYMBOL_EXPORT_END()

/* If we could use constexpr the following macros could be inline functions
 * ... but sadly we cannot. */

#define rb_scan_args_isdigit(c) (RBIMPL_CAST((unsigned char)((c)-'0'))<10)

#define rb_scan_args_count_end(fmt, ofs, vari) \
    ((fmt)[ofs] ? -1 : (vari))

#define rb_scan_args_count_block(fmt, ofs, vari) \
    ((fmt)[ofs]!='&' ? \
     rb_scan_args_count_end(fmt, ofs, vari) : \
     rb_scan_args_count_end(fmt, (ofs)+1, (vari)+1))

#define rb_scan_args_count_hash(fmt, ofs, vari) \
    ((fmt)[ofs]!=':' ? \
     rb_scan_args_count_block(fmt, ofs, vari) : \
     rb_scan_args_count_block(fmt, (ofs)+1, (vari)+1))

#define rb_scan_args_count_trail(fmt, ofs, vari) \
    (!rb_scan_args_isdigit((fmt)[ofs]) ? \
     rb_scan_args_count_hash(fmt, ofs, vari) : \
     rb_scan_args_count_hash(fmt, (ofs)+1, (vari)+((fmt)[ofs]-'0')))

#define rb_scan_args_count_var(fmt, ofs, vari) \
    ((fmt)[ofs]!='*' ? \
     rb_scan_args_count_trail(fmt, ofs, vari) : \
     rb_scan_args_count_trail(fmt, (ofs)+1, (vari)+1))

#define rb_scan_args_count_opt(fmt, ofs, vari) \
    (!rb_scan_args_isdigit((fmt)[ofs]) ? \
     rb_scan_args_count_var(fmt, ofs, vari) : \
     rb_scan_args_count_var(fmt, (ofs)+1, (vari)+(fmt)[ofs]-'0'))

#define rb_scan_args_count_lead(fmt, ofs, vari) \
    (!rb_scan_args_isdigit((fmt)[ofs]) ? \
     rb_scan_args_count_var(fmt, ofs, vari) : \
     rb_scan_args_count_opt(fmt, (ofs)+1, (vari)+(fmt)[ofs]-'0'))

#define rb_scan_args_count(fmt) rb_scan_args_count_lead(fmt, 0, 0)

#if RBIMPL_HAS_ATTRIBUTE(diagnose_if)
# /* Assertions done in the attribute. */
# define rb_scan_args_verify(fmt, varc) RBIMPL_ASSERT_NOTHING
#else
# /* At  one sight  it _seems_  the expressions  below could  be written  using
#  * static assrtions.  The reality is no, they don't.  Because fmt is a string
#  * literal, any operations  against fmt cannot produce  the "integer constant
#  * expression"s, as  defined in ISO/IEC  9899:2018 section 6.6  paragraph #6.
#  * Static assertions  need such  integer constant  expressions as  defined in
#  * ISO/IEC 9899:2018 section 6.7.10 paragraph #3.
#  *
#  * GCC nonetheless constant-folds this into no-op, though. */
# define rb_scan_args_verify(fmt, varc) \
    (sizeof(char[1-2*(rb_scan_args_count(fmt)<0)])!=1 ? \
     rb_scan_args_bad_format(fmt) : \
     sizeof(char[1-2*(rb_scan_args_count(fmt)!=(varc))])!=1 ? \
     rb_scan_args_length_mismatch(fmt, varc) : \
     RBIMPL_ASSERT_NOTHING)
#endif

static inline bool
rb_scan_args_keyword_p(int kw_flag, VALUE last)
{
    switch (kw_flag) {
      case RB_SCAN_ARGS_PASS_CALLED_KEYWORDS:
        return !! rb_keyword_given_p();
      case RB_SCAN_ARGS_KEYWORDS:
        return true;
      case RB_SCAN_ARGS_LAST_HASH_KEYWORDS:
        return RB_TYPE_P(last, T_HASH);
      default:
        return false;
    }
}

RBIMPL_ATTR_FORCEINLINE()
static bool
rb_scan_args_lead_p(const char *fmt)
{
    return rb_scan_args_isdigit(fmt[0]);
}

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_n_lead(const char *fmt)
{
    return (rb_scan_args_lead_p(fmt) ? fmt[0]-'0' : 0);
}

RBIMPL_ATTR_FORCEINLINE()
static bool
rb_scan_args_opt_p(const char *fmt)
{
    return (rb_scan_args_lead_p(fmt) && rb_scan_args_isdigit(fmt[1]));
}

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_n_opt(const char *fmt)
{
    return (rb_scan_args_opt_p(fmt) ? fmt[1]-'0' : 0);
}

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_var_idx(const char *fmt)
{
    return (!rb_scan_args_lead_p(fmt) ? 0 : !rb_scan_args_isdigit(fmt[1]) ? 1 : 2);
}

RBIMPL_ATTR_FORCEINLINE()
static bool
rb_scan_args_f_var(const char *fmt)
{
    return (fmt[rb_scan_args_var_idx(fmt)]=='*');
}

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_trail_idx(const char *fmt)
{
    const int idx = rb_scan_args_var_idx(fmt);
    return idx+(fmt[idx]=='*');
}

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_n_trail(const char *fmt)
{
    const int idx = rb_scan_args_trail_idx(fmt);
    return (rb_scan_args_isdigit(fmt[idx]) ? fmt[idx]-'0' : 0);
}

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_hash_idx(const char *fmt)
{
    const int idx = rb_scan_args_trail_idx(fmt);
    return idx+rb_scan_args_isdigit(fmt[idx]);
}

RBIMPL_ATTR_FORCEINLINE()
static bool
rb_scan_args_f_hash(const char *fmt)
{
    return (fmt[rb_scan_args_hash_idx(fmt)]==':');
}

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_block_idx(const char *fmt)
{
    const int idx = rb_scan_args_hash_idx(fmt);
    return idx+(fmt[idx]==':');
}

RBIMPL_ATTR_FORCEINLINE()
static bool
rb_scan_args_f_block(const char *fmt)
{
    return (fmt[rb_scan_args_block_idx(fmt)]=='&');
}

# if 0
RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_end_idx(const char *fmt)
{
    const int idx = rb_scan_args_block_idx(fmt);
    return idx+(fmt[idx]=='&');
}
# endif

/* NOTE: Use `char *fmt` instead of `const char *fmt` because of clang's bug*/
/* https://bugs.llvm.org/show_bug.cgi?id=38095 */
# define rb_scan_args0(argc, argv, fmt, varc, vars) \
    rb_scan_args_set(RB_SCAN_ARGS_PASS_CALLED_KEYWORDS, argc, argv, \
                     rb_scan_args_n_lead(fmt), \
                     rb_scan_args_n_opt(fmt), \
                     rb_scan_args_n_trail(fmt), \
                     rb_scan_args_f_var(fmt), \
                     rb_scan_args_f_hash(fmt), \
                     rb_scan_args_f_block(fmt), \
                     (rb_scan_args_verify(fmt, varc), vars), (char *)fmt, varc)
# define rb_scan_args_kw0(kw_flag, argc, argv, fmt, varc, vars) \
    rb_scan_args_set(kw_flag, argc, argv, \
                     rb_scan_args_n_lead(fmt), \
                     rb_scan_args_n_opt(fmt), \
                     rb_scan_args_n_trail(fmt), \
                     rb_scan_args_f_var(fmt), \
                     rb_scan_args_f_hash(fmt), \
                     rb_scan_args_f_block(fmt), \
                     (rb_scan_args_verify(fmt, varc), vars), (char *)fmt, varc)

RBIMPL_ATTR_FORCEINLINE()
static int
rb_scan_args_set(int kw_flag, int argc, const VALUE *argv,
                 int n_lead, int n_opt, int n_trail,
                 bool f_var, bool f_hash, bool f_block,
                 VALUE *vars[], RB_UNUSED_VAR(const char *fmt), RB_UNUSED_VAR(int varc))
    RBIMPL_ATTR_DIAGNOSE_IF(rb_scan_args_count(fmt) <  0,    "bad scan arg format",                    "error")
    RBIMPL_ATTR_DIAGNOSE_IF(rb_scan_args_count(fmt) != varc, "variable argument length doesn't match", "error")
{
    int i, argi = 0, vari = 0;
    VALUE *var, hash = Qnil;
#define rb_scan_args_next_param() vars[vari++]
    const int n_mand = n_lead + n_trail;

/* capture an option hash - phase 1: pop from the argv */
    if (f_hash && argc > 0) {
        VALUE last = argv[argc - 1];
        if (rb_scan_args_keyword_p(kw_flag, last)) {
            hash = rb_hash_dup(last);
            argc--;
        }
    }

if (argc < n_mand) {
        goto argc_error;
    }

/* capture leading mandatory arguments */
    for (i = 0; i < n_lead; i++) {
        var = rb_scan_args_next_param();
        if (var) *var = argv[argi];
        argi++;
    }

/* capture optional arguments */
    for (i = 0; i < n_opt; i++) {
        var = rb_scan_args_next_param();
        if (argi < argc - n_trail) {
            if (var) *var = argv[argi];
            argi++;
        }
        else {
            if (var) *var = Qnil;
        }
    }

/* capture variable length arguments */
    if (f_var) {
        int n_var = argc - argi - n_trail;

var = rb_scan_args_next_param();
        if (0 < n_var) {
            if (var) *var = rb_ary_new_from_values(n_var, &argv[argi]);
            argi += n_var;
        }
        else {
            if (var) *var = rb_ary_new();
        }
    }

/* capture trailing mandatory arguments */
    for (i = 0; i < n_trail; i++) {
        var = rb_scan_args_next_param();
        if (var) *var = argv[argi];
        argi++;
    }

/* capture an option hash - phase 2: assignment */
    if (f_hash) {
        var = rb_scan_args_next_param();
        if (var) *var = hash;
    }

/* capture iterator block */
    if (f_block) {
        var = rb_scan_args_next_param();
        if (rb_block_given_p()) {
            *var = rb_block_proc();
        }
        else {
            *var = Qnil;
        }
    }

if (argi == argc) {
        return argc;
    }

argc_error:
    rb_error_arity(argc, n_mand, f_var ? UNLIMITED_ARGUMENTS : n_mand + n_opt);
    UNREACHABLE_RETURN(-1);
#undef rb_scan_args_next_param
}

#if ! defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
# /* skip */

#elif ! defined(HAVE_VA_ARGS_MACRO)
# /* skip */

#elif ! defined(__OPTIMIZE__)
# /* skip */

#elif defined(HAVE___VA_OPT__)
# define rb_scan_args(argc, argvp, fmt, ...)                  \
    __builtin_choose_expr(                                    \
        __builtin_constant_p(fmt),                            \
        rb_scan_args0(                                        \
            argc, argvp, fmt,                                 \
            (sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)), \
            ((VALUE*[]){__VA_ARGS__})),                       \
        (rb_scan_args)(argc, argvp, fmt __VA_OPT__(, __VA_ARGS__)))
# define rb_scan_args_kw(kw_flag, argc, argvp, fmt, ...)      \
    __builtin_choose_expr(                                    \
        __builtin_constant_p(fmt),                            \
        rb_scan_args_kw0(                                     \
            kw_flag, argc, argvp, fmt,                        \
            (sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)), \
            ((VALUE*[]){__VA_ARGS__})),                       \
        (rb_scan_args_kw)(kw_flag, argc, argvp, fmt __VA_OPT__(, __VA_ARGS__)))

#elif defined(__STRICT_ANSI__)
# /* skip */

#elif defined(__GNUC__)
# define rb_scan_args(argc, argvp, fmt, ...)                  \
    __builtin_choose_expr(                                    \
        __builtin_constant_p(fmt),                            \
        rb_scan_args0(                                        \
            argc, argvp, fmt,                                 \
            (sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)), \
            ((VALUE*[]){__VA_ARGS__})),                       \
        (rb_scan_args)(argc, argvp, fmt, __VA_ARGS__))
# define rb_scan_args_kw(kw_flag, argc, argvp, fmt, ...)      \
    __builtin_choose_expr(                                    \
        __builtin_constant_p(fmt),                            \
        rb_scan_args_kw0(                                     \
            kw_flag, argc, argvp, fmt,                        \
            (sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)), \
            ((VALUE*[]){__VA_ARGS__})),                       \
        (rb_scan_args_kw)(kw_flag, argc, argvp, fmt, __VA_ARGS__ /**/))
#endif

#endif /* RBIMPL_SCAN_ARGS_H */

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