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comparison src/share/vm/opto/graphKit.cpp @ 1397:b4776199210f

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6943485: JVMTI always on capabilities change code generation too much Reviewed-by: twisti, dcubed
author never
date Mon, 26 Apr 2010 23:59:45 -0700
parents 7b4415a18c8a
children c18cbe5936b8 2458a1f25356
comparison
equal deleted inserted replaced
1396:d7f654633cfe 1397:b4776199210f
810 // Walk the inline list to fill in the correct set of JVMState's 810 // Walk the inline list to fill in the correct set of JVMState's
811 // Also fill in the associated edges for each JVMState. 811 // Also fill in the associated edges for each JVMState.
812 812
813 JVMState* youngest_jvms = sync_jvms(); 813 JVMState* youngest_jvms = sync_jvms();
814 814
815 // Do we need debug info here? If it is a SafePoint and this method
816 // cannot de-opt, then we do NOT need any debug info.
817 bool full_info = (C->deopt_happens() || call->Opcode() != Op_SafePoint);
818
819 // If we are guaranteed to throw, we can prune everything but the 815 // If we are guaranteed to throw, we can prune everything but the
820 // input to the current bytecode. 816 // input to the current bytecode.
821 bool can_prune_locals = false; 817 bool can_prune_locals = false;
822 uint stack_slots_not_pruned = 0; 818 uint stack_slots_not_pruned = 0;
823 int inputs = 0, depth = 0; 819 int inputs = 0, depth = 0;
827 can_prune_locals = true; 823 can_prune_locals = true;
828 stack_slots_not_pruned = inputs; 824 stack_slots_not_pruned = inputs;
829 } 825 }
830 } 826 }
831 827
832 if (env()->jvmti_can_examine_or_deopt_anywhere()) { 828 if (env()->jvmti_can_access_local_variables()) {
833 // At any safepoint, this method can get breakpointed, which would 829 // At any safepoint, this method can get breakpointed, which would
834 // then require an immediate deoptimization. 830 // then require an immediate deoptimization.
835 full_info = true;
836 can_prune_locals = false; // do not prune locals 831 can_prune_locals = false; // do not prune locals
837 stack_slots_not_pruned = 0; 832 stack_slots_not_pruned = 0;
838 } 833 }
839 834
840 // do not scribble on the input jvms 835 // do not scribble on the input jvms
888 883
889 // Add the Locals 884 // Add the Locals
890 k = in_jvms->locoff(); 885 k = in_jvms->locoff();
891 l = in_jvms->loc_size(); 886 l = in_jvms->loc_size();
892 out_jvms->set_locoff(p); 887 out_jvms->set_locoff(p);
893 if (full_info && !can_prune_locals) { 888 if (!can_prune_locals) {
894 for (j = 0; j < l; j++) 889 for (j = 0; j < l; j++)
895 call->set_req(p++, in_map->in(k+j)); 890 call->set_req(p++, in_map->in(k+j));
896 } else { 891 } else {
897 p += l; // already set to top above by add_req_batch 892 p += l; // already set to top above by add_req_batch
898 } 893 }
899 894
900 // Add the Expression Stack 895 // Add the Expression Stack
901 k = in_jvms->stkoff(); 896 k = in_jvms->stkoff();
902 l = in_jvms->sp(); 897 l = in_jvms->sp();
903 out_jvms->set_stkoff(p); 898 out_jvms->set_stkoff(p);
904 if (full_info && !can_prune_locals) { 899 if (!can_prune_locals) {
905 for (j = 0; j < l; j++) 900 for (j = 0; j < l; j++)
906 call->set_req(p++, in_map->in(k+j)); 901 call->set_req(p++, in_map->in(k+j));
907 } else if (can_prune_locals && stack_slots_not_pruned != 0) { 902 } else if (can_prune_locals && stack_slots_not_pruned != 0) {
908 // Divide stack into {S0,...,S1}, where S0 is set to top. 903 // Divide stack into {S0,...,S1}, where S0 is set to top.
909 uint s1 = stack_slots_not_pruned; 904 uint s1 = stack_slots_not_pruned;