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* src/symtab.h, src/lr0.c: here.
This commit is contained in:
Akim Demaille
2020-02-22 20:25:12 +01:00
parent 323731ff74
commit 296660304c
4 changed files with 16 additions and 15 deletions
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15
src/gram.h
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@@ -42,9 +42,9 @@
Internally, we cannot use the number 0 for a rule because for
instance RITEM stores both symbol (the RHS) and rule numbers: the
symbols are shorts >= 0, and rule number are stored negative.
symbols are integers >= 0, and rule numbers are stored negative.
Therefore 0 cannot be used, since it would be both the rule number
0, and the token $end).
0, and the token $end.
Actions are accessed via the rule number.
@@ -55,8 +55,7 @@
RULES[R].lhs -- the symbol of the left hand side of rule R.
RULES[R].rhs -- the index in RITEM of the beginning of the portion
for rule R.
RULES[R].rhs -- the beginning of the portion of RITEM for rule R.
RULES[R].prec -- the symbol providing the precedence level of R.
@@ -75,16 +74,16 @@
RULES[R].line -- the line where R was defined.
RULES[R].useful -- whether the rule is used (i.e., false if thrown
away by reduce).
RULES[R].useful -- whether the rule is used. False if thrown away
by reduce().
The right hand side is stored as symbol numbers in a portion of
RITEM.
The length of the portion is one greater than the number of symbols
in the rule's right hand side. The last element in the portion
contains minus R, which identifies it as the end of a portion and
says which rule it is for.
contains -R, which identifies it as the end of a portion and says
which rule it is for.
The portions of RITEM come in order of increasing rule number.
NRITEMS is the total length of RITEM. Each element of RITEM is