diff options
author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-08-31 08:21:46 +0000 |
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committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-08-31 08:21:46 +0000 |
commit | 9f1994ed5ce9e5f3a0964058b4753a021a92e40d (patch) | |
tree | b8530dbd622619640e94ab40e230b415894fb120 /io.c | |
parent | bb03f02805d1cd112c5fc7a3a8027ed2797c0074 (diff) | |
download | ruby-9f1994ed5ce9e5f3a0964058b4753a021a92e40d.tar.gz |
io.c: shrink read buffer
* io.c (io_setstrbuf): return true if the buffer is newly created.
* io.c (io_set_read_length): shrink the read buffer if it is a new
object and is too large. [ruby-core:81370] [Bug #13597]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'io.c')
-rw-r--r-- | io.c | 58 |
1 files changed, 39 insertions, 19 deletions
@@ -2140,7 +2140,7 @@ io_bufread(char *ptr, long len, rb_io_t *fptr) return len - n; } -static void io_setstrbuf(VALUE *str, long len); +static int io_setstrbuf(VALUE *str, long len); struct bufread_arg { char *str_ptr; @@ -2359,33 +2359,45 @@ io_shift_cbuf(rb_io_t *fptr, int len, VALUE *strp) return str; } -static void +static int io_setstrbuf(VALUE *str, long len) { #ifdef _WIN32 len = (len + 1) & ~1L; /* round up for wide char */ #endif if (NIL_P(*str)) { - *str = rb_str_new(0, 0); + *str = rb_str_new(0, len); + return TRUE; } else { VALUE s = StringValue(*str); long clen = RSTRING_LEN(s); if (clen >= len) { rb_str_modify(s); - return; + return FALSE; } len -= clen; } rb_str_modify_expand(*str, len); + return FALSE; } +#define MAX_REALLOC_GAP 4096 static void -io_set_read_length(VALUE str, long n) +io_shrink_read_string(VALUE str, long n) +{ + if (rb_str_capacity(str) - n > MAX_REALLOC_GAP) { + rb_str_resize(str, n); + } +} + +static void +io_set_read_length(VALUE str, long n, int shrinkable) { if (RSTRING_LEN(str) != n) { rb_str_modify(str); rb_str_set_len(str, n); + if (shrinkable) io_shrink_read_string(str, n); } } @@ -2397,11 +2409,12 @@ read_all(rb_io_t *fptr, long siz, VALUE str) long pos; rb_encoding *enc; int cr; + int shrinkable; if (NEED_READCONV(fptr)) { int first = !NIL_P(str); SET_BINARY_MODE(fptr); - io_setstrbuf(&str,0); + shrinkable = io_setstrbuf(&str,0); make_readconv(fptr, 0); while (1) { VALUE v; @@ -2420,6 +2433,7 @@ read_all(rb_io_t *fptr, long siz, VALUE str) if (v == MORE_CHAR_FINISHED) { clear_readconv(fptr); if (first) rb_str_set_len(str, first = 0); + if (shrinkable) io_shrink_read_string(str, RSTRING_LEN(str)); return io_enc_str(str, fptr); } } @@ -2433,7 +2447,7 @@ read_all(rb_io_t *fptr, long siz, VALUE str) cr = 0; if (siz == 0) siz = BUFSIZ; - io_setstrbuf(&str,siz); + shrinkable = io_setstrbuf(&str, siz); for (;;) { READ_CHECK(fptr); n = io_fread(str, bytes, siz - bytes, fptr); @@ -2449,6 +2463,7 @@ read_all(rb_io_t *fptr, long siz, VALUE str) siz += BUFSIZ; rb_str_modify_expand(str, BUFSIZ); } + if (shrinkable) io_shrink_read_string(str, RSTRING_LEN(str)); str = io_enc_str(str, fptr); ENC_CODERANGE_SET(str, cr); return str; @@ -2511,6 +2526,7 @@ io_getpartial(int argc, VALUE *argv, VALUE io, VALUE opts, int nonblock) VALUE length, str; long n, len; struct read_internal_arg arg; + int shrinkable; rb_scan_args(argc, argv, "11", &length, &str); @@ -2518,7 +2534,7 @@ io_getpartial(int argc, VALUE *argv, VALUE io, VALUE opts, int nonblock) rb_raise(rb_eArgError, "negative length %ld given", len); } - io_setstrbuf(&str,len); + shrinkable = io_setstrbuf(&str, len); OBJ_TAINT(str); GetOpenFile(io, fptr); @@ -2555,7 +2571,7 @@ io_getpartial(int argc, VALUE *argv, VALUE io, VALUE opts, int nonblock) rb_syserr_fail_path(e, fptr->pathv); } } - io_set_read_length(str, n); + io_set_read_length(str, n, shrinkable); if (n == 0) return Qnil; @@ -2651,12 +2667,13 @@ io_read_nonblock(VALUE io, VALUE length, VALUE str, VALUE ex) rb_io_t *fptr; long n, len; struct read_internal_arg arg; + int shrinkable; if ((len = NUM2LONG(length)) < 0) { rb_raise(rb_eArgError, "negative length %ld given", len); } - io_setstrbuf(&str,len); + shrinkable = io_setstrbuf(&str, len); OBJ_TAINT(str); GetOpenFile(io, fptr); rb_io_check_byte_readable(fptr); @@ -2667,7 +2684,7 @@ io_read_nonblock(VALUE io, VALUE length, VALUE str, VALUE ex) n = read_buffered_data(RSTRING_PTR(str), len, fptr); if (n <= 0) { rb_io_set_nonblock(fptr); - io_setstrbuf(&str, len); + shrinkable |= io_setstrbuf(&str, len); arg.fd = fptr->fd; arg.str_ptr = RSTRING_PTR(str); arg.len = len; @@ -2683,7 +2700,7 @@ io_read_nonblock(VALUE io, VALUE length, VALUE str, VALUE ex) rb_syserr_fail_path(e, fptr->pathv); } } - io_set_read_length(str, n); + io_set_read_length(str, n, shrinkable); if (n == 0) { if (ex == Qfalse) return Qnil; @@ -2802,6 +2819,7 @@ io_read(int argc, VALUE *argv, VALUE io) rb_io_t *fptr; long n, len; VALUE length, str; + int shrinkable; #if defined(RUBY_TEST_CRLF_ENVIRONMENT) || defined(_WIN32) int previous_mode; #endif @@ -2818,12 +2836,12 @@ io_read(int argc, VALUE *argv, VALUE io) rb_raise(rb_eArgError, "negative length %ld given", len); } - io_setstrbuf(&str,len); + shrinkable = io_setstrbuf(&str,len); GetOpenFile(io, fptr); rb_io_check_byte_readable(fptr); if (len == 0) { - io_set_read_length(str, 0); + io_set_read_length(str, 0, shrinkable); return str; } @@ -2832,7 +2850,7 @@ io_read(int argc, VALUE *argv, VALUE io) previous_mode = set_binary_mode_with_seek_cur(fptr); #endif n = io_fread(str, 0, len, fptr); - io_set_read_length(str, n); + io_set_read_length(str, n, shrinkable); #if defined(RUBY_TEST_CRLF_ENVIRONMENT) || defined(_WIN32) if (previous_mode == O_TEXT) { setmode(fptr->fd, O_TEXT); @@ -4787,11 +4805,12 @@ rb_io_sysread(int argc, VALUE *argv, VALUE io) rb_io_t *fptr; long n, ilen; struct read_internal_arg arg; + int shrinkable; rb_scan_args(argc, argv, "11", &len, &str); ilen = NUM2LONG(len); - io_setstrbuf(&str,ilen); + shrinkable = io_setstrbuf(&str, ilen); if (ilen == 0) return str; GetOpenFile(io, fptr); @@ -4823,7 +4842,7 @@ rb_io_sysread(int argc, VALUE *argv, VALUE io) if (n == -1) { rb_sys_fail_path(fptr->pathv); } - io_set_read_length(str, n); + io_set_read_length(str, n, shrinkable); if (n == 0 && ilen > 0) { rb_eof_error(); } @@ -4884,12 +4903,13 @@ rb_io_pread(int argc, VALUE *argv, VALUE io) rb_io_t *fptr; ssize_t n; struct prdwr_internal_arg arg; + int shrinkable; rb_scan_args(argc, argv, "21", &len, &offset, &str); arg.count = NUM2SIZET(len); arg.offset = NUM2OFFT(offset); - io_setstrbuf(&str, (long)arg.count); + shrinkable = io_setstrbuf(&str, (long)arg.count); if (arg.count == 0) return str; arg.buf = RSTRING_PTR(str); @@ -4905,7 +4925,7 @@ rb_io_pread(int argc, VALUE *argv, VALUE io) if (n == -1) { rb_sys_fail_path(fptr->pathv); } - io_set_read_length(str, n); + io_set_read_length(str, n, shrinkable); if (n == 0 && arg.count > 0) { rb_eof_error(); } |