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authorAndrew Burgess <andrew.burgess@embecosm.com>2018-12-17 11:21:08 +0000
committerAndrew Burgess <andrew.burgess@embecosm.com>2018-12-24 17:25:25 +0000
commitb6c95c0cc5bd60e2de86d611120bf6191f99860a (patch)
tree4cd57b303235fe96a7abf855b1646b8e4abc18ad
parent45b8ae0c3348a6e6aa64ad5d114adabdc399c5ef (diff)
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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.
-rw-r--r--gdb/ChangeLog6
-rw-r--r--gdb/c-exp.y17
2 files changed, 21 insertions, 2 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 21731be..ced5180 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -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
diff --git a/gdb/c-exp.y b/gdb/c-exp.y
index bfc7841..447ac78 100644
--- a/gdb/c-exp.y
+++ b/gdb/c-exp.y
@@ -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},