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gdb: Extend the comments in c-exp.y 

In an attempt to fix PR gdb/13368 this commit adds some comments to
c-exp.y which hopefully makes the type parsing code a little clearer.
There are no code changes here, so there should be no user visible
changes after this commit.

gdb/ChangeLog:

	PR gdb/13368
	* c-exp.y (typebase): Extend the comment.
	(ident_tokens): Likewise.
This commit is contained in:
Andrew Burgess 2018-12-17 11:21:08 +00:00
parent 45b8ae0c33
commit b6c95c0cc5
2 changed files with 21 additions and 2 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2018-12-24 Andrew Burgess <andrew.burgess@embecosm.com>
PR gdb/13368
* c-exp.y (typebase): Extend the comment.
(ident_tokens): Likewise.
2018-12-18 Tom Tromey <tom@tromey.com>
* dwarf2read.c (dwarf2_find_containing_comp_unit): Don't take

17
gdb/c-exp.y
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@ -1224,7 +1224,17 @@ func_mod: '(' ')'
type : ptype
;
typebase /* Implements (approximately): (type-qualifier)* type-specifier */
/* Implements (approximately): (type-qualifier)* type-specifier.
When type-specifier is only ever a single word, like 'float' then these
arrive as pre-built TYPENAME tokens thanks to the classify_name
function. However, when a type-specifier can contain multiple words,
for example 'double' can appear as just 'double' or 'long double', and
similarly 'long' can appear as just 'long' or in 'long double', then
these type-specifiers are parsed into their own tokens in the function
lex_one_token and the ident_tokens array. These separate tokens are all
recognised here. */
typebase
: TYPENAME
{ $$ = $1.type; }
| INT_KEYWORD
@ -2323,7 +2333,10 @@ static const struct token tokentab2[] =
{".*", DOT_STAR, BINOP_END, FLAG_CXX}
};
/* Identifier-like tokens. */
/* Identifier-like tokens. Only type-specifiers than can appear in
multi-word type names (for example 'double' can appear in 'long
double') need to be listed here. type-specifiers that are only ever
single word (like 'float') are handled by the classify_name function. */
static const struct token ident_tokens[] =
{
{"unsigned", UNSIGNED, OP_NULL, 0},