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skeletons: introduce "slot"s for symbols

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Extracted from d9cf99b6a5, in the master
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* data/skeletons/bison.m4 (b4_symbol_slot): New, with safer semantics
than type and type_tag.
This commit is contained in:
Akim Demaille
2021-01-23 10:14:19 +01:00
parent 11f6839645
commit c73dcd6958
2 changed files with 21 additions and 1 deletions
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14
data/skeletons/bison.m4
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@@ -465,6 +465,19 @@ m4_case([$1],
# but are S_YYEMPTY and symbol_kind::S_YYEMPTY in C++.
m4_copy([b4_symbol_kind_base], [b4_symbol_kind])
# b4_symbol_slot(NUM)
# -------------------
# The name of union member that contains the value of these symbols.
# Currently, we are messy, this should actually be type_tag, but type_tag
# has several meanings.
m4_define([b4_symbol_slot],
[m4_case(b4_percent_define_get([[api.value.type]]),
[union], [b4_symbol([$1], [type_tag])],
[variant], [b4_symbol([$1], [type_tag])],
[b4_symbol([$1], [type])])])
# b4_symbol(NUM, FIELD)
# ---------------------
# Fetch FIELD of symbol #NUM (or "orig NUM"). Fail if undefined.
@@ -475,6 +488,7 @@ m4_define([b4_symbol],
[id], [b4_symbol_token_kind([$1])],
[kind_base], [b4_symbol_kind_base([$1])],
[kind], [b4_symbol_kind([$1])],
[slot], [b4_symbol_slot([$1])],
[_b4_symbol($@)])])