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Commit7c0eb3c

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Tighten up parsing logic in gen_node_support.pl.
Teach this script to handle function pointer fields honestly.Previously they were just silently ignored, but that's not likely tobe a behavior we can accept indefinitely. This mostly entails fixingit so that a field declaration spanning multiple lines can be parsed,because we have a bunch of such fields that're laid out that way.But that's a good improvement in its own right.With that change and a minor regex adjustment, the only struct itfails to parse in the node-defining headers is A_Const, becauseof the embedded union. The path of least resistance is to movethat union declaration outside the struct.Having done those things, we can make it error out if it findsany within-struct syntax it doesn't understand, which seems likea pretty important property for robustness.This commit doesn't change the output files at all; it's just inthe way of future-proofing.Discussion:https://postgr.es/m/2593369.1657759779@sss.pgh.pa.us
1 parent5794491 commit7c0eb3c

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3 files changed

+90
-20
lines changed

3 files changed

+90
-20
lines changed

‎src/backend/nodes/gen_node_support.pl

Lines changed: 73 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -213,15 +213,39 @@ sub elem
213213
}
214214
$file_content .=$raw_file_content;
215215

216-
my$lineno = 0;
216+
my$lineno = 0;
217+
my$prevline ='';
217218
foreachmy$line (split /\n/,$file_content)
218219
{
220+
# per-physical-line processing
219221
$lineno++;
220222
chomp$line;
221223
$line =~s/\s*$//;
222224
nextif$lineeq'';
223225
nextif$line =~/^#(define|ifdef|endif)/;
224226

227+
# within a struct, don't process until we have whole logical line
228+
if ($in_struct &&$subline > 0)
229+
{
230+
if ($line =~/;$/)
231+
{
232+
# found the end, re-attach any previous line(s)
233+
$line =$prevline .$line;
234+
$prevline ='';
235+
}
236+
elsif ($prevlineeq''
237+
&&$line =~/^\s*pg_node_attr\(([\w(), ]*)\)$/)
238+
{
239+
# special case: node-attributes line doesn't end with semi
240+
}
241+
else
242+
{
243+
# set it aside for a moment
244+
$prevline .=$line .'';
245+
next;
246+
}
247+
}
248+
225249
# we are analyzing a struct definition
226250
if ($in_struct)
227251
{
@@ -394,7 +418,7 @@ sub elem
394418
}
395419
# normal struct field
396420
elsif ($line =~
397-
/^\s*(.+)\s*\b(\w+)(\[\w+\])?\s*(?:pg_node_attr\(([\w(), ]*)\))?;/
421+
/^\s*(.+)\s*\b(\w+)(\[[\w\s+]+\])?\s*(?:pg_node_attr\(([\w(), ]*)\))?;/
398422
)
399423
{
400424
if ($is_node_struct)
@@ -441,13 +465,46 @@ sub elem
441465
$my_field_attrs{$name} = \@attrs;
442466
}
443467
}
444-
else
468+
# function pointer field
469+
elsif ($line =~
470+
/^\s*([\w\s*]+)\s*\(\*(\w+)\)\s*\((.*)\)\s*(?:pg_node_attr\(([\w(), ]*)\))?;/
471+
)
445472
{
446473
if ($is_node_struct)
447474
{
448-
#warn "$infile:$lineno: could not parse \"$line\"\n";
475+
my$type =$1;
476+
my$name =$2;
477+
my$args =$3;
478+
my$attrs =$4;
479+
480+
my@attrs;
481+
if ($attrs)
482+
{
483+
@attrs =split /,\s*/,$attrs;
484+
foreachmy$attr (@attrs)
485+
{
486+
if ($attr !~/^copy_as\(\w+\)$/
487+
&&$attr !~/^read_as\(\w+\)$/
488+
&& !elem$attr,
489+
qw(equal_ignore read_write_ignore))
490+
{
491+
die
492+
"$infile:$lineno: unrecognized attribute\"$attr\"\n";
493+
}
494+
}
495+
}
496+
497+
push@my_fields,$name;
498+
$my_field_types{$name} ='function pointer';
499+
$my_field_attrs{$name} = \@attrs;
449500
}
450501
}
502+
else
503+
{
504+
# We're not too picky about what's outside structs,
505+
# but we'd better understand everything inside.
506+
die"$infile:$lineno: could not parse\"$line\"\n";
507+
}
451508
}
452509
# not in a struct
453510
else
@@ -709,6 +766,12 @@ sub elem
709766
unless$equal_ignore;
710767
}
711768
}
769+
elsif ($teq'function pointer')
770+
{
771+
# we can copy and compare as a scalar
772+
print$cff"\tCOPY_SCALAR_FIELD($f);\n"unless$copy_ignore;
773+
print$eff"\tCOMPARE_SCALAR_FIELD($f);\n"unless$equal_ignore;
774+
}
712775
# node type
713776
elsif ($t =~/(\w+)\*/and elem$1,@node_types)
714777
{
@@ -980,6 +1043,12 @@ sub elem
9801043
unless$no_read;
9811044
}
9821045
}
1046+
elsif ($teq'function pointer')
1047+
{
1048+
# We don't print these, and we can't read them either
1049+
die"cannot read function pointer in struct\"$n\" field\"$f\"\n"
1050+
unless$no_read;
1051+
}
9831052
# Special treatments of several Path node fields
9841053
elsif ($teq'RelOptInfo*' && elem'write_only_relids',@a)
9851054
{

‎src/include/nodes/parsenodes.h

Lines changed: 14 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -303,26 +303,26 @@ typedef struct A_Expr
303303

304304
/*
305305
* A_Const - a literal constant
306+
*
307+
* Value nodes are inline for performance. You can treat 'val' as a node,
308+
* as in IsA(&val, Integer). 'val' is not valid if isnull is true.
306309
*/
310+
unionValUnion
311+
{
312+
Nodenode;
313+
Integerival;
314+
Floatfval;
315+
Booleanboolval;
316+
Stringsval;
317+
BitStringbsval;
318+
};
319+
307320
typedefstructA_Const
308321
{
309322
pg_node_attr(custom_copy_equal,custom_read_write,no_read)
310323

311324
NodeTagtype;
312-
313-
/*
314-
* Value nodes are inline for performance. You can treat 'val' as a node,
315-
* as in IsA(&val, Integer). 'val' is not valid if isnull is true.
316-
*/
317-
unionValUnion
318-
{
319-
Nodenode;
320-
Integerival;
321-
Floatfval;
322-
Booleanboolval;
323-
Stringsval;
324-
BitStringbsval;
325-
}val;
325+
unionValUnionval;
326326
boolisnull;/* SQL NULL constant */
327327
intlocation;/* token location, or -1 if unknown */
328328
}A_Const;

‎src/include/nodes/pathnodes.h

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1098,7 +1098,7 @@ struct IndexOptInfo
10981098

10991099
/*
11001100
* Remaining fields are copied from the index AM's API struct
1101-
* (IndexAmRoutine)
1101+
* (IndexAmRoutine). We don't bother to dump them.
11021102
*/
11031103
boolamcanorderbyoppg_node_attr(read_write_ignore);
11041104
boolamoptionalkeypg_node_attr(read_write_ignore);
@@ -1111,8 +1111,9 @@ struct IndexOptInfo
11111111
boolamcanparallelpg_node_attr(read_write_ignore);
11121112
/* does AM have ammarkpos interface? */
11131113
boolamcanmarkpospg_node_attr(read_write_ignore);
1114+
/* AM's cost estimator */
11141115
/* Rather than include amapi.h here, we declare amcostestimate like this */
1115-
void(*amcostestimate) ();/* AM's cost estimator */
1116+
void(*amcostestimate) ()pg_node_attr(read_write_ignore);
11161117
};
11171118

11181119
/*

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