[pull] master from php:master #5
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* PHP-7.3: Yet another check for php_strip_tags_ex()
* PHP-7.4: Yet another check for php_strip_tags_ex()
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Apr 8, 2021
When encountering the following SSA graph:
BB1:
#2.T1 [string] = COALESCE #1.CV0($str) [null, string] BB2
BB2:
#5.T1 [string] = QM_ASSIGN string("")
BB3:
#7.X1 [string] = Phi(#2.X1 [string], #5.X1 [string])
FREE #7.T1 [string]
We would currently determine that #7, #5 are dead, and eliminate
the FREE and QM_ASSIGN. However, we cannot eliminate #2, as
COALESCE is also responsible for control flow.
Fix this my marking all non-CV phis as live to start with. This
can be relaxed to check the kind of the source instruction, but
I couldn't immediately come up with a case where it would be
useful.
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May 18, 2021
Part of generated opcodes for $foo are:
...
BB1:
0002 INIT_FCALL 1 96 string("foo")
0003 #5.V1 [rcn, object (instanceof A)] = FETCH_THIS
0004 SEND_REF #5.V1 [rcn, object (instanceof A)] 1
0005 DO_UCALL
Updates in functions zend_jit_fetch_this() and zend_jit_load_this() are
made to support FETCH_THIS opcode.
One new path is covered in function zend_jit_send_ref() by SEND_REF
opcode.
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