United StatesChange Country, Oracle Worldwide Web Sites Communities I am a... I want to...
Bug ID: 6673473 Escape Analysis: Add the instance's field information to PhiNode.
6673473 : Escape Analysis: Add the instance's field information to PhiNode.

Details
Type:
Enhancement
Submit Date:
2008-03-10
Status:
Closed
Updated Date:
2011-04-20
Project Name:
JDK
Resolved Date:
2011-04-20
Component:
hotspot
OS:
solaris_10
Sub-Component:
compiler
CPU:
sparc
Priority:
P4
Resolution:
Fixed
Affected Versions:
hs12
Fixed Versions:
hs12

Related Reports
Backport:
JDK-2174847 - Escape Analysis: Add the instance's field information to PhiNode.
Backport:
JDK-2172215 - Escape Analysis: Add the instance's field information to PhiNode.

Sub Tasks

Description
Phi nodes are generated when needed to represent instance's fields values to scalar 
replace an allocation. They are generated during memory optimization by using 
split_through_phi optimization. It creates problem when we do this for loop's Phi 
since there is no a guard against infinite (for each optimization path for the loop) 
generation of such values Phi nodes.

Comments
SUGGESTED FIX

The changeset contains the next additional changes.

Fix TypeAryPtr::xmeet() and dump2() methods for new array instances.

Move the code in MemNode::Ideal_common() to the separate method 
step_through_mergemem() which will be used in the next EA changes.

Replace incorrect assert (static calls are not only runtime calls) 
in MemNode::Ideal_DU_postCCP() with more precise asserts.

Fix the assert in MergeMemNode::Ideal() to allow duplicated references when
the transformation is still in 'progress'.
2008-03-14 
SUGGESTED FIX

Add the instance's field information to PhiNode to reuse the same value Phi
for each optimization path for a loop.
2008-03-10 
EVALUATION

See description.
2008-03-10


Hardware and Software, Engineered to Work Together