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  1. JDK
  2. JDK-8229350

Shenandoah does not need barriers before CreateEx

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    • gc
    • b10

    Description

      Current vmTestbase_vm_mlvm tests fail with 32-bit binaries like this:

      $ CONF=linux-x86-server-fastdebug make images test TEST_VM_OPTS="-XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:-TieredCompilation" TEST=vmTestbase/vm/mlvm/indy/stress/gc/lotsOfCallSites/Test.java
      ....

      need barrier on?: ins:
       151 CallStaticJava === 686 92 93 8 1 ( 132 13 26 1 1 1 1 14 1 1 1 1 1 1 26 132 1 ) [[ 152 153 154 156 ]] # Static java.lang.invoke.MethodHandleNatives::resolve java/lang/invoke/MemberName:exact * ( java/lang/invoke/MemberName:exact *, java/lang/Class:exact *, int ) MemberName$Factory::resolve @ bci:34 MemberName$Factory::resolveOrFail @ bci:5 !jvms: MemberName$Factory::resolve @ bci:34 MemberName$Factory::resolveOrFail @ bci:5
       158 Catch === 152 153 [[ 159 160 ]] !orig=[656] !jvms: MemberName$Factory::resolve @ bci:34 MemberName$Factory::resolveOrFail @ bci:5
       153 Proj === 151 [[ 206 158 683 163 332 682 660 435 415 312 347 ]] #1 !orig=[555] !jvms: MemberName$Factory::resolve @ bci:34 MemberName$Factory::resolveOrFail @ bci:5
       160 CatchProj === 158 [[ 689 163 ]] #1@bci -1 !jvms: MemberName$Factory::resolve @ bci:34 MemberName$Factory::resolveOrFail @ bci:5
       163 CreateEx === 160 153 [[ 164 164 696 683 ]] #java/lang/Throwable:NotNull * Oop:java/lang/Throwable:NotNull * !jvms: MemberName$Factory::resolve @ bci:34 MemberName$Factory::resolveOrFail @ bci:5

      CreateEx instantiates the exceptions from either the new allocations, or from the prebuilt exception table. In either case, we do not need barriers for it.

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              shade Aleksey Shipilev
              shade Aleksey Shipilev
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