src/hotspot/cpu/x86/jniFastGetField_x86_32.cpp

rev 55759 : 8227680: FastJNIAccessors: Check for JVMTI field access event requests at runtime
Summary: Check JvmtiExport::_field_access_count != 0 at runtime
Reviewed-by:

*** 1,7 ****
  /*
!  * Copyright (c) 2004, 2017, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2004, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 73,82 ****
--- 73,91 ----
  
    ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
    __ mov32 (rcx, counter);
    __ testb (rcx, 1);
    __ jcc (Assembler::notZero, slow);
+ 
+   if (JvmtiExport::can_post_field_access()) {
+     // Check to see if a field access watch has been set before we
+     // take the fast path.
+     __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
+     __ testl(rax, rax);
+     __ jcc(Assembler::notZero, slow);
+   }
+ 
    __ mov(rax, rcx);
    __ andptr(rax, 1);                         // rax, must end up 0
    __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
                                              // obj, notice rax, is 0.
                                              // rdx is data dependent on rcx.
*** 186,195 ****
--- 195,213 ----
  
    __ push  (rsi);
    __ mov32 (rcx, counter);
    __ testb (rcx, 1);
    __ jcc (Assembler::notZero, slow);
+ 
+   if (JvmtiExport::can_post_field_access()) {
+     // Check to see if a field access watch has been set before we
+     // take the fast path.
+     __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
+     __ testl(rax, rax);
+     __ jcc(Assembler::notZero, slow);
+   }
+ 
    __ mov(rax, rcx);
    __ andptr(rax, 1);                         // rax, must end up 0
    __ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
                                              // obj, notice rax, is 0.
                                              // rdx is data dependent on rcx.
*** 270,279 ****
--- 288,306 ----
    ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
  
    __ mov32 (rcx, counter);
    __ testb (rcx, 1);
    __ jcc (Assembler::notZero, slow);
+ 
+   if (JvmtiExport::can_post_field_access()) {
+     // Check to see if a field access watch has been set before we
+     // take the fast path.
+     __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
+     __ testl(rax, rax);
+     __ jcc(Assembler::notZero, slow);
+   }
+ 
    __ mov(rax, rcx);
    __ andptr(rax, 1);                         // rax, must end up 0
    __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
                                              // obj, notice rax, is 0.
                                              // rdx is data dependent on rcx.