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| author | Paul "LeoNerd" Evans <leonerd@leonerd.org.uk> | 2021-07-27 14:55:14 +0100 |
|---|---|---|
| committer | Paul Evans <leonerd@leonerd.org.uk> | 2021-08-25 13:52:09 +0100 |
| commit | f79e2ff95fbb22eaf18e130c7cba8a9d40be3d75 (patch) | |
| tree | 18bedb48e757671114f8f63c8691677a06b62a1b /regen | |
| parent | 4b21956ed64a9303ab72a46be1cd68c22bff2560 (diff) | |
| download | perl-f79e2ff95fbb22eaf18e130c7cba8a9d40be3d75.tar.gz | |
Create `defer` syntax and `OP_PUSHDEFER` opcode
Adds syntax `defer { BLOCK }` to create a deferred block; code that is
deferred until the scope exits. This syntax is guarded by
use feature 'defer';
Adds a new opcode, `OP_PUSHDEFER`, which is a LOGOP whose `op_other` field
gives the start of an optree to be deferred until scope exit. That op
pointer will be stored on the save stack and invoked as part of scope
unwind.
Included is support for `B::Deparse` to deparse the optree back into
syntax.
Diffstat (limited to 'regen')
| -rwxr-xr-x | regen/feature.pl | 9 | ||||
| -rwxr-xr-x | regen/keywords.pl | 2 | ||||
| -rw-r--r-- | regen/opcodes | 1 | ||||
| -rw-r--r-- | regen/warnings.pl | 4 |
4 files changed, 14 insertions, 2 deletions
diff --git a/regen/feature.pl b/regen/feature.pl index 79f789a96d..a07986e38a 100755 --- a/regen/feature.pl +++ b/regen/feature.pl @@ -41,6 +41,7 @@ my %feature = ( multidimensional => 'multidimensional', bareword_filehandles => 'bareword_filehandles', try => 'try', + defer => 'defer', ); # NOTE: If a feature is ever enabled in a non-contiguous range of Perl @@ -481,7 +482,7 @@ read_only_bottom_close_and_rename($h); __END__ package feature; -our $VERSION = '1.67'; +our $VERSION = '1.68'; FEATURES @@ -838,6 +839,12 @@ C<try> are caught by executing the body of the C<catch> block. For more information, see L<perlsyn/"Try Catch Exception Handling">. +=head2 The 'defer' feature + +This feature enables the C<defer> block syntax, which allows a block of code +to be deferred until when the flow of control leaves the block which contained +it. For more details, see L<perlsyn/defer>. + =head1 FEATURE BUNDLES It's possible to load multiple features together, using diff --git a/regen/keywords.pl b/regen/keywords.pl index 77f8aa9d93..ace205efb5 100755 --- a/regen/keywords.pl +++ b/regen/keywords.pl @@ -49,6 +49,7 @@ my %feature_kw = ( isa => 'isa', try => 'try', catch => 'try', + defer => 'defer', ); my %pos = map { ($_ => 1) } @{$by_strength{'+'}}; @@ -152,6 +153,7 @@ __END__ -dbmclose -dbmopen +default ++defer +defined +delete -die diff --git a/regen/opcodes b/regen/opcodes index 6a3f8db024..0192f1c804 100644 --- a/regen/opcodes +++ b/regen/opcodes @@ -582,3 +582,4 @@ entertrycatch try {block} ck_trycatch | leavetrycatch try {block} exit ck_null @ poptry pop try ck_null @ catch catch {} block ck_null | +pushdefer push defer {} block ck_null | diff --git a/regen/warnings.pl b/regen/warnings.pl index 056851f592..3d128449a4 100644 --- a/regen/warnings.pl +++ b/regen/warnings.pl @@ -16,7 +16,7 @@ # # This script is normally invoked from regen.pl. -$VERSION = '1.53'; +$VERSION = '1.54'; BEGIN { require './regen/regen_lib.pl'; @@ -119,6 +119,8 @@ my $tree = { [ 5.031, DEFAULT_ON ], 'experimental::try' => [ 5.033, DEFAULT_ON ], + 'experimental::defer' => + [ 5.035, DEFAULT_ON ], }], 'missing' => [ 5.021, DEFAULT_OFF], |