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[Feature #18239] Add struct for embedded strings

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This commit is contained in:
Peter Zhu 2021-08-02 12:16:24 -04:00
parent 09fa773e04
commit 46b66eb9e8
Notes: git 2021-10-26 02:26:50 +09:00
2 changed files with 22 additions and 21 deletions
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21
include/ruby/internal/core/rstring.h
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@ -270,15 +270,16 @@ struct RString {
VALUE shared;
} aux;
} heap;
/**
* Embedded contents. When a string is short enough, it uses this area
* to store the contents themselves. This was impractical in the 20th
* century, but these days 64 bit machines can typically hold 48 bytes
* here. Could be sufficiently large. In this case the length is
* encoded into the flags.
*/
char ary[RSTRING_EMBED_LEN_MAX + 1];
struct {
/**
* Embedded contents. When a string is short enough, it uses this area
* to store the contents themselves. This was impractical in the 20th
* century, but these days 64 bit machines can typically hold 48 bytes
* here. Could be sufficiently large. In this case the length is
* encoded into the flags.
*/
char ary[RSTRING_EMBED_LEN_MAX + 1];
} embed;
} as;
};
@ -440,7 +441,7 @@ rbimpl_rstring_getmem(VALUE str)
/* 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;
retval.as.heap.ptr = RSTRING(str)->as.embed.ary;
return retval;
}
}