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cmd/yacc: generate arrays instead of slices where possible
Yacc generates a bunch of global variables of the form
var yyFoo = []int{...}
where yyFoo is never subsequently modified to point to a different
slice. Since these variables are implicitly compiled as
var yyFoo = ([...]int{...})[:]
anyway, by simply converting them all to
var yyFoo = [...]int{...}
we save sizeof(sliceStruct) bytes of data memory for each variable and
also make len(yyFoo) into compile-time constant expressions, which
shaves some bytes off text size:
$ size 6g.before 6g.after
text data bss dec hex filename
4598019 605968 342700 5546687 54a2bf 6g.before
4597810 605552 342700 5546062 54a04e 6g.after
Change-Id: I53c7aa6efdb2d52738013e9d337a59afbfcb2494
Reviewed-on: https://go-review.googlesource.com/7520
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Matthew Dempsky
parent
01d005c616
commit
a1bb3030c8
@ -2240,7 +2240,6 @@ hidden_interfacedcl_list:
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}
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%%
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func fixlbrace(lbr int) {
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// If the opening brace was an LBODY,
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// set up for another one now that we're done.
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@ -2249,4 +2248,3 @@ func fixlbrace(lbr int) {
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loophack = 1
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}
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}
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@ -69,7 +69,7 @@ const NotPackage = 57392
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const NotParen = 57393
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const PreferToRightParen = 57394
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var yyToknames = []string{
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var yyToknames = [...]string{
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"LLITERAL",
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"LASOP",
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"LCOLAS",
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@ -130,7 +130,7 @@ var yyToknames = []string{
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"')'",
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"PreferToRightParen",
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}
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var yyStatenames = []string{}
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var yyStatenames = [...]string{}
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const yyEofCode = 1
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const yyErrCode = 2
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@ -147,7 +147,7 @@ func fixlbrace(lbr int) {
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}
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//line yacctab:1
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var yyExca = []int{
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var yyExca = [...]int{
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-1, 1,
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1, -1,
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-2, 0,
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@ -272,7 +272,7 @@ var yyStates []string
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const yyLast = 2282
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var yyAct = []int{
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var yyAct = [...]int{
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74, 381, 304, 285, 291, 486, 610, 398, 545, 478,
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549, 296, 186, 75, 400, 229, 302, 401, 103, 389,
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@ -504,7 +504,7 @@ var yyAct = []int{
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137, 136, 0, 151, 141, 142, 143, 144, 145, 146,
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147, 148,
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}
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var yyPact = []int{
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var yyPact = [...]int{
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-1000, -1000, 542, 536, -1000, 164, -1000, 550, 555, 318,
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-1000, -1000, -1000, 588, -1000, -1000, 549, 1340, 316, 155,
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@ -574,7 +574,7 @@ var yyPact = []int{
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110, -1000, 37, 2017, -1000, -1000, 2017, -1000, -1000, -1000,
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-1000, -1000, -1000, -1000, -1000, 1689, 518, -1000,
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}
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var yyPgo = []int{
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var yyPgo = [...]int{
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0, 57, 771, 774, 45, 150, 26, 540, 29, 770,
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768, 2, 28, 61, 322, 766, 17, 4, 765, 761,
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@ -592,7 +592,7 @@ var yyPgo = []int{
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648, 647, 642, 639, 637, 634, 631, 627, 38, 623,
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596, 593,
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}
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var yyR1 = []int{
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var yyR1 = [...]int{
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0, 112, 114, 114, 116, 113, 115, 115, 119, 119,
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119, 120, 120, 121, 121, 2, 2, 2, 117, 123,
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@ -631,7 +631,7 @@ var yyR1 = []int{
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94, 94, 93, 93, 125, 125, 100, 100, 104, 104,
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102, 102,
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}
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var yyR2 = []int{
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var yyR2 = [...]int{
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0, 4, 0, 3, 0, 3, 0, 3, 2, 5,
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3, 3, 2, 1, 3, 1, 2, 2, 4, 0,
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@ -670,7 +670,7 @@ var yyR2 = []int{
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2, 1, 1, 5, 0, 2, 1, 3, 1, 3,
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1, 3,
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}
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var yyChk = []int{
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var yyChk = [...]int{
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-1000, -112, -113, -116, -114, 26, -117, 26, -115, -3,
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25, -91, 74, 75, -118, -124, 25, -60, -119, 22,
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@ -740,7 +740,7 @@ var yyChk = []int{
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15, 73, -58, 61, 61, 61, 61, -52, 67, 67,
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21, -11, 69, -99, -99, -134, -24, -53,
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}
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var yyDef = []int{
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var yyDef = [...]int{
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4, -2, 2, 0, 6, 0, 21, 0, 218, 0,
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157, 158, 159, 0, 5, 344, 19, -2, 0, 0,
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@ -810,7 +810,7 @@ var yyDef = []int{
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0, 133, 0, 335, 343, 337, 335, 206, 56, 57,
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82, 87, 145, 333, 208, 294, 0, 83,
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}
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var yyTok1 = []int{
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var yyTok1 = [...]int{
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1, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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@ -826,7 +826,7 @@ var yyTok1 = []int{
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 68, 52, 69, 71,
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}
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var yyTok2 = []int{
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var yyTok2 = [...]int{
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2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
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@ -835,7 +835,7 @@ var yyTok2 = []int{
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42, 43, 44, 45, 46, 47, 48, 49, 58, 59,
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62,
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}
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var yyTok3 = []int{
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var yyTok3 = [...]int{
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0,
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}
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@ -517,14 +517,14 @@ outer:
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// put out names of token names
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ftable.WriteRune('\n')
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fmt.Fprintf(ftable, "var %sToknames = []string{\n", prefix)
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fmt.Fprintf(ftable, "var %sToknames = [...]string{\n", prefix)
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for i := TOKSTART; i <= ntokens; i++ {
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fmt.Fprintf(ftable, "\t\"%v\",\n", tokset[i].name)
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}
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fmt.Fprintf(ftable, "}\n")
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// put out names of state names
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fmt.Fprintf(ftable, "var %sStatenames = []string{", prefix)
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fmt.Fprintf(ftable, "var %sStatenames = [...]string{", prefix)
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// for i:=TOKSTART; i<=ntokens; i++ {
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// fmt.Fprintf(ftable, "\t\"%v\",\n", tokset[i].name);
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// }
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@ -2156,7 +2156,7 @@ func output() {
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if !lflag {
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fmt.Fprintf(ftable, "\n//line yacctab:1")
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}
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fmt.Fprintf(ftable, "\nvar %sExca = []int{\n", prefix)
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fmt.Fprintf(ftable, "\nvar %sExca = [...]int{\n", prefix)
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noset := mkset()
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@ -2892,7 +2892,7 @@ func others() {
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arout("Tok2", temp1, c+1)
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// table 3 has everything else
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fmt.Fprintf(ftable, "var %sTok3 = []int{\n\t", prefix)
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fmt.Fprintf(ftable, "var %sTok3 = [...]int{\n\t", prefix)
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c = 0
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for i = 1; i <= ntokens; i++ {
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j = tokset[i].value
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@ -2937,7 +2937,7 @@ func others() {
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func arout(s string, v []int, n int) {
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s = prefix + s
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fmt.Fprintf(ftable, "var %v = []int{\n", s)
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fmt.Fprintf(ftable, "var %v = [...]int{\n", s)
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for i := 0; i < n; i++ {
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if i%10 == 0 {
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fmt.Fprintf(ftable, "\n\t")
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