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gc: support for building with Plan 9 yacc

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I've modified Plan 9's yacc to work with
the grammar in go.y.  These are the only
changes necessary on the Go side.

R=rsc
CC=golang-dev
https://golang.org/cl/5375104
This commit is contained in:
Anthony Martin 2011-11-16 16:58:02 -05:00 committed by Russ Cox
parent d0b9a84ab3
commit 920df48fb1
2 changed files with 27 additions and 9 deletions
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29
src/cmd/gc/bisonerrors
View File

@ -46,24 +46,36 @@ bison && /^state 0/ { grammar = 0; states = 1 }
states && /^state / { state = $2 }
states { statetext[state] = statetext[state] $0 "\n" }
states && / shift, and go to state/ {
states && / shift/ {
n = nshift[state]++
shift[state,n] = $7
if($0 ~ /and go to/)
shift[state,n] = $7 # GNU Bison
else
shift[state,n] = $3 # Plan 9 Yacc
shifttoken[state,n] = $1
next
}
states && / go to state/ {
states && / (go to|goto)/ {
n = nshift[state]++
shift[state,n] = $5
if($0 ~ /go to/)
shift[state,n] = $5 # GNU Bison
else
shift[state,n] = $3 # Plan 9 Yacc
shifttoken[state,n] = $1
next
}
states && / reduce using rule/ {
states && / reduce/ {
n = nreduce[state]++
reduce[state,n] = $5
if($0 ~ /reduce using rule/)
reduce[state,n] = $5 # GNU Bison
else
reduce[state,n] = $3 # Plan 9 yacc
reducetoken[state,n] = $1
next
}
}
# Skip over the summary information printed by Plan 9 yacc.
/nonterminals$/,/^maximum spread/ { next }
# First // comment marks the beginning of the pattern file.
/^\/\// { bison = 0; grammar = 0; state = 0 }
@ -96,7 +108,8 @@ $1 == "%" {
if(found)
continue
for(j=0; j<nreduce[state]; j++) {
if(reducetoken[state,j] == tok || reducetoken[state,j] == "$default") {
t = reducetoken[state,j]
if(t == tok || t == "$default" || t == ".") {
stack[nstack++] = state
rule = reduce[state,j]
nstack -= rulesize[rule]

7
src/cmd/gc/go.h
View File

@ -16,6 +16,12 @@
#undef BUFSIZ
// The parser's maximum stack size.
// We have to use a #define macro here since yacc
// or bison will check for its definition and use
// a potentially smaller value if it is undefined.
#define YYMAXDEPTH 500
enum
{
NHUNK = 50000,
@ -23,7 +29,6 @@ enum
NSYMB = 500,
NHASH = 1024,
STRINGSZ = 200,
YYMAXDEPTH = 500,
MAXALIGN = 7,
UINF = 100,
HISTSZ = 10,