Branch: refs/heads/blead
Home: https://github.com/Perl/perl5
Commit: a902d92a78262a0fd111789742f9c9e2a7fa2f42
https://github.com/Perl/perl5/commit/a902d92a78262a0fd111789742f9c9e2a7fa2f42
Author: Richard Leach <richardle...@users.noreply.github.com>
Date: 2024-06-11 (Tue, 11 Jun 2024)
Changed paths:
M op.c
Log Message:
-----------
Perl_op_convert_list: No unnecessary processing of unfolded CONSTs
When Perl_op_convert_list is called to stringify a CONST OP, but the
`op_folded` flag has not been passed in, a fair amount of activity
occurs before the function returns the original CONST OP unchanged.
After this commit, the CONST OP is returned directly.
For example, prior to this commit, given the statement 'print "2\n',
the function is passed a simple CONST OP:
1 const SVOP(0x55c99432c0b8) ===> [SELF]
PARENT ===> [0x0]
FLAGS = (SCALAR,SLABBED)
SV = PV("2\n"\0)
List context is forced upon it to yield:
2 list LISTOP(0x55c99432c048) ===> [0x0]
PARENT ===> [0x0]
FLAGS = (UNKNOWN,KIDS,SLABBED)
|
3 +--pushmark OP(0x55c99432c088) ===> [SELF]
| FLAGS = (SCALAR,SLABBED,MORESIB)
|
1 +--const SVOP(0x55c99432c0b8) ===> [SELF]
FLAGS = (SCALAR,SLABBED)
SV = PV("2\n"\0)
The pushmark is nullified and the parent type set:
2 stringify LISTOP(0x55c99432c048) ===> [0x0]
PARENT ===> [0x0]
FLAGS = (UNKNOWN,KIDS,SLABBED)
|
3 +--null (ex-pushmark) OP(0x55c99432c088) ===> [SELF]
| FLAGS = (SCALAR,SLABBED,MORESIB)
|
1 +--const SVOP(0x55c99432c0b8) ===> [SELF]
FLAGS = (SCALAR,SLABBED)
SV = PV("2\n"\0)
CHECKOP sets the number of non-null KIDS for the stringify:
2 stringify LISTOP(0x55c99432c048) ===> [0x0]
PARENT ===> [0x0]
FLAGS = (UNKNOWN,KIDS,SLABBED)
PRIVATE = (0x1)
|
3 +--null (ex-pushmark) OP(0x55c99432c088) ===> [SELF]
| FLAGS = (SCALAR,SLABBED,MORESIB)
|
1 +--const SVOP(0x55c99432c0b8) ===> [SELF]
FLAGS = (SCALAR,SLABBED)
SV = PV("2\n"\0)
Then it is constant folded back to:
1 const SVOP(0x55c99432c0b8) ===> [SELF]
PARENT ===> [0x0]
FLAGS = (SCALAR,SLABBED)
SV = PV("2\n"\0)
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