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Make JSON.generate 1.75x as fast #562

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Make JSON.generate 1.75x as fast #562

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e1cf787
Stop prebuilding array_delim
mame Dec 27, 2023
08f79bb
Stop prebuilding object_delim
mame Dec 27, 2023
964f42e
Stop prebuilding object_delim2
mame Dec 27, 2023
8a800d3
Apply RB_UNLIKELY for less frequently used options
mame Dec 27, 2023
a19e80b
Use `RB_ENCODING_GET` instead of `rb_enc_get` to improve performance
mame Dec 27, 2023
a81ec47
Pre-check that escaping is not required for string dump
mame Dec 27, 2023
fc98d7f
Use efficient object-type dispatching
mame Dec 27, 2023
2914e35
Directly use `generate_json_string` for object keys
mame Dec 27, 2023
946cefe
Use `RARRAY_AREF` instead of `rb_ary_entry` to improve performance
mame Dec 27, 2023
da58b62
Define dummy `RB_UNLIKELY` for old ruby versions
mame Dec 27, 2023
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15 changes: 4 additions & 11 deletions ext/json/ext/fbuffer/fbuffer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -59,14 +59,15 @@ typedef struct FBufferStruct {

static FBuffer *fbuffer_alloc(unsigned long initial_length);
static void fbuffer_free(FBuffer *fb);
#ifndef JSON_GENERATOR
static void fbuffer_clear(FBuffer *fb);
#endif
static void fbuffer_append(FBuffer *fb, const char *newstr, unsigned long len);
#ifdef JSON_GENERATOR
static void fbuffer_append_long(FBuffer *fb, long number);
#endif
static void fbuffer_append_char(FBuffer *fb, char newchr);
#ifdef JSON_GENERATOR
static FBuffer *fbuffer_dup(FBuffer *fb);
static VALUE fbuffer_to_s(FBuffer *fb);
#endif

Expand All @@ -86,10 +87,12 @@ static void fbuffer_free(FBuffer *fb)
ruby_xfree(fb);
}

#ifndef JSON_GENERATOR
static void fbuffer_clear(FBuffer *fb)
{
fb->len = 0;
}
#endif

static void fbuffer_inc_capa(FBuffer *fb, unsigned long requested)
{
Expand Down Expand Up @@ -166,16 +169,6 @@ static void fbuffer_append_long(FBuffer *fb, long number)
fbuffer_append(fb, buf, len);
}

static FBuffer *fbuffer_dup(FBuffer *fb)
{
unsigned long len = fb->len;
FBuffer *result;

result = fbuffer_alloc(len);
fbuffer_append(result, FBUFFER_PAIR(fb));
return result;
}

static VALUE fbuffer_to_s(FBuffer *fb)
{
VALUE result = rb_str_new(FBUFFER_PTR(fb), FBUFFER_LEN(fb));
Expand Down
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