jdk8-mips64-public/hotspot: src/cpu/ppc/vm/templateInterpreter

src/cpu/ppc/vm/templateInterpreter_ppc.cpp@0bf37f737702 (annotated)

src/cpu/ppc/vm/templateInterpreter_ppc.cpp

Tue, 01 Apr 2014 09:36:49 +0200

author: roland
date: Tue, 01 Apr 2014 09:36:49 +0200
changeset 6723: 0bf37f737702
parent 6660: 63c5920a038d
child 6876: 710a3c8b516e
child 7132: b384ba33c9a0
permissions: -rw-r--r--

8032410: compiler/uncommontrap/TestStackBangRbp.java times out on Solaris-Sparc V9
Summary: make compiled code bang the stack by the worst case size of the interpreter frame at deoptimization points.
Reviewed-by: twisti, kvn

 /*
  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2013, 2014 SAP AG. 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.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #ifndef CC_INTERP
 #include "asm/macroAssembler.inline.hpp"
 #include "interpreter/bytecodeHistogram.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/interpreterGenerator.hpp"
 #include "interpreter/interpreterRuntime.hpp"
 #include "interpreter/templateTable.hpp"
 #include "oops/arrayOop.hpp"
 #include "oops/methodData.hpp"
 #include "oops/method.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "prims/jvmtiThreadState.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/deoptimization.hpp"
 #include "runtime/frame.inline.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "runtime/synchronizer.hpp"
 #include "runtime/timer.hpp"
 #include "runtime/vframeArray.hpp"
 #include "utilities/debug.hpp"
 #include "utilities/macros.hpp"
 #undef __
 #define __ _masm->
 #ifdef PRODUCT
 #define BLOCK_COMMENT(str) /* nothing */
 #else
 #define BLOCK_COMMENT(str) __ block_comment(str)
 #endif
 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
 //-----------------------------------------------------------------------------
 // Actually we should never reach here since we do stack overflow checks before pushing any frame.
 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
   address entry = __ pc();
   __ unimplemented("generate_StackOverflowError_handler");
   return entry;
 }
 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(const char* name) {
   address entry = __ pc();
   __ empty_expression_stack();
   __ load_const_optimized(R4_ARG2, (address) name);
   // Index is in R17_tos.
   __ mr(R5_ARG3, R17_tos);
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException));
   return entry;
 }
 #if 0
 // Call special ClassCastException constructor taking object to cast
 // and target class as arguments.
 address TemplateInterpreterGenerator::generate_ClassCastException_verbose_handler() {
   address entry = __ pc();
   // Expression stack must be empty before entering the VM if an
   // exception happened.
   __ empty_expression_stack();
   // Thread will be loaded to R3_ARG1.
   // Target class oop is in register R5_ARG3 by convention!
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException_verbose, R17_tos, R5_ARG3));
   // Above call must not return here since exception pending.
   DEBUG_ONLY(__ should_not_reach_here();)
   return entry;
 }
 #endif
 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
   address entry = __ pc();
   // Expression stack must be empty before entering the VM if an
   // exception happened.
   __ empty_expression_stack();
   // Load exception object.
   // Thread will be loaded to R3_ARG1.
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException), R17_tos);
 #ifdef ASSERT
   // Above call must not return here since exception pending.
   __ should_not_reach_here();
 #endif
   return entry;
 }
 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
   address entry = __ pc();
   //__ untested("generate_exception_handler_common");
   Register Rexception = R17_tos;
   // Expression stack must be empty before entering the VM if an exception happened.
   __ empty_expression_stack();
   __ load_const_optimized(R4_ARG2, (address) name, R11_scratch1);
   if (pass_oop) {
     __ mr(R5_ARG3, Rexception);
     __ call_VM(Rexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception), false);
   } else {
     __ load_const_optimized(R5_ARG3, (address) message, R11_scratch1);
     __ call_VM(Rexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), false);
   }
   // Throw exception.
   __ mr(R3_ARG1, Rexception);
   __ load_const_optimized(R11_scratch1, Interpreter::throw_exception_entry(), R12_scratch2);
   __ mtctr(R11_scratch1);
   __ bctr();
   return entry;
 }
 address TemplateInterpreterGenerator::generate_continuation_for(TosState state) {
   address entry = __ pc();
   __ unimplemented("generate_continuation_for");
   return entry;
 }
 // This entry is returned to when a call returns to the interpreter.
 // When we arrive here, we expect that the callee stack frame is already popped.
 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
   address entry = __ pc();
   // Move the value out of the return register back to the TOS cache of current frame.
   switch (state) {
     case ltos:
     case btos:
     case ctos:
     case stos:
     case atos:
     case itos: __ mr(R17_tos, R3_RET); break;   // RET -> TOS cache
     case ftos:
     case dtos: __ fmr(F15_ftos, F1_RET); break; // TOS cache -> GR_FRET
     case vtos: break;                           // Nothing to do, this was a void return.
     default  : ShouldNotReachHere();
   }
   __ restore_interpreter_state(R11_scratch1); // Sets R11_scratch1 = fp.
   __ ld(R12_scratch2, _ijava_state_neg(top_frame_sp), R11_scratch1);
   __ resize_frame_absolute(R12_scratch2, R11_scratch1, R0);
   // Compiled code destroys templateTableBase, reload.
   __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R12_scratch2);
   const Register cache = R11_scratch1;
   const Register size  = R12_scratch2;
   __ get_cache_and_index_at_bcp(cache, 1, index_size);
   // Big Endian (get least significant byte of 64 bit value):
   __ lbz(size, in_bytes(ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()) + 7, cache);
   __ sldi(size, size, Interpreter::logStackElementSize);
   __ add(R15_esp, R15_esp, size);
   __ dispatch_next(state, step);
   return entry;
 }
 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step) {
   address entry = __ pc();
   // If state != vtos, we're returning from a native method, which put it's result
   // into the result register. So move the value out of the return register back
   // to the TOS cache of current frame.
   switch (state) {
     case ltos:
     case btos:
     case ctos:
     case stos:
     case atos:
     case itos: __ mr(R17_tos, R3_RET); break;   // GR_RET -> TOS cache
     case ftos:
     case dtos: __ fmr(F15_ftos, F1_RET); break; // TOS cache -> GR_FRET
     case vtos: break;                           // Nothing to do, this was a void return.
     default  : ShouldNotReachHere();
   }
   // Load LcpoolCache @@@ should be already set!
   __ get_constant_pool_cache(R27_constPoolCache);
   // Handle a pending exception, fall through if none.
   __ check_and_forward_exception(R11_scratch1, R12_scratch2);
   // Start executing bytecodes.
   __ dispatch_next(state, step);
   return entry;
 }
 // A result handler converts the native result into java format.
 // Use the shared code between c++ and template interpreter.
 address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) {
   return AbstractInterpreterGenerator::generate_result_handler_for(type);
 }
 address TemplateInterpreterGenerator::generate_safept_entry_for(TosState state, address runtime_entry) {
   address entry = __ pc();
   __ push(state);
   __ call_VM(noreg, runtime_entry);
   __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos));
   return entry;
 }
 // Helpers for commoning out cases in the various type of method entries.
 // Increment invocation count & check for overflow.
 //
 // Note: checking for negative value instead of overflow
 //       so we have a 'sticky' overflow test.
 //
 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
   // Note: In tiered we increment either counters in method or in MDO depending if we're profiling or not.
   Register Rscratch1   = R11_scratch1;
   Register Rscratch2   = R12_scratch2;
   Register R3_counters = R3_ARG1;
   Label done;
   if (TieredCompilation) {
     const int increment = InvocationCounter::count_increment;
     const int mask = ((1 << Tier0InvokeNotifyFreqLog) - 1) << InvocationCounter::count_shift;
     Label no_mdo;
     if (ProfileInterpreter) {
       const Register Rmdo = Rscratch1;
       // If no method data exists, go to profile_continue.
       __ ld(Rmdo, in_bytes(Method::method_data_offset()), R19_method);
       __ cmpdi(CCR0, Rmdo, 0);
       __ beq(CCR0, no_mdo);
       // Increment backedge counter in the MDO.
       const int mdo_bc_offs = in_bytes(MethodData::backedge_counter_offset()) + in_bytes(InvocationCounter::counter_offset());
       __ lwz(Rscratch2, mdo_bc_offs, Rmdo);
       __ addi(Rscratch2, Rscratch2, increment);
       __ stw(Rscratch2, mdo_bc_offs, Rmdo);
       __ load_const_optimized(Rscratch1, mask, R0);
       __ and_(Rscratch1, Rscratch2, Rscratch1);
       __ bne(CCR0, done);
       __ b(*overflow);
     }
     // Increment counter in MethodCounters*.
     const int mo_bc_offs = in_bytes(MethodCounters::backedge_counter_offset()) + in_bytes(InvocationCounter::counter_offset());
     __ bind(no_mdo);
     __ get_method_counters(R19_method, R3_counters, done);
     __ lwz(Rscratch2, mo_bc_offs, R3_counters);
     __ addi(Rscratch2, Rscratch2, increment);
     __ stw(Rscratch2, mo_bc_offs, R3_counters);
     __ load_const_optimized(Rscratch1, mask, R0);
     __ and_(Rscratch1, Rscratch2, Rscratch1);
     __ beq(CCR0, *overflow);
     __ bind(done);
   } else {
     // Update standard invocation counters.
     Register Rsum_ivc_bec = R4_ARG2;
     __ get_method_counters(R19_method, R3_counters, done);
     __ increment_invocation_counter(R3_counters, Rsum_ivc_bec, R12_scratch2);
     // Increment interpreter invocation counter.
     if (ProfileInterpreter) {  // %%% Merge this into methodDataOop.
       __ lwz(R12_scratch2, in_bytes(MethodCounters::interpreter_invocation_counter_offset()), R3_counters);
       __ addi(R12_scratch2, R12_scratch2, 1);
       __ stw(R12_scratch2, in_bytes(MethodCounters::interpreter_invocation_counter_offset()), R3_counters);
     }
     // Check if we must create a method data obj.
     if (ProfileInterpreter && profile_method != NULL) {
       const Register profile_limit = Rscratch1;
       int pl_offs = __ load_const_optimized(profile_limit, &InvocationCounter::InterpreterProfileLimit, R0, true);
       __ lwz(profile_limit, pl_offs, profile_limit);
       // Test to see if we should create a method data oop.
       __ cmpw(CCR0, Rsum_ivc_bec, profile_limit);
       __ blt(CCR0, *profile_method_continue);
       // If no method data exists, go to profile_method.
       __ test_method_data_pointer(*profile_method);
     }
     // Finally check for counter overflow.
     if (overflow) {
       const Register invocation_limit = Rscratch1;
       int il_offs = __ load_const_optimized(invocation_limit, &InvocationCounter::InterpreterInvocationLimit, R0, true);
       __ lwz(invocation_limit, il_offs, invocation_limit);
       assert(4 == sizeof(InvocationCounter::InterpreterInvocationLimit), "unexpected field size");
       __ cmpw(CCR0, Rsum_ivc_bec, invocation_limit);
       __ bge(CCR0, *overflow);
     }
     __ bind(done);
   }
 }
 // Generate code to initiate compilation on invocation counter overflow.
 void TemplateInterpreterGenerator::generate_counter_overflow(Label& continue_entry) {
   // Generate code to initiate compilation on the counter overflow.
   // InterpreterRuntime::frequency_counter_overflow takes one arguments,
   // which indicates if the counter overflow occurs at a backwards branch (NULL bcp)
   // We pass zero in.
   // The call returns the address of the verified entry point for the method or NULL
   // if the compilation did not complete (either went background or bailed out).
   //
   // Unlike the C++ interpreter above: Check exceptions!
   // Assumption: Caller must set the flag "do_not_unlock_if_sychronized" if the monitor of a sync'ed
   // method has not yet been created. Thus, no unlocking of a non-existing monitor can occur.
   __ li(R4_ARG2, 0);
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), R4_ARG2, true);
   // Returns verified_entry_point or NULL.
   // We ignore it in any case.
   __ b(continue_entry);
 }
 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register Rmem_frame_size, Register Rscratch1) {
   assert_different_registers(Rmem_frame_size, Rscratch1);
   __ generate_stack_overflow_check_with_compare_and_throw(Rmem_frame_size, Rscratch1);
 }
 void TemplateInterpreterGenerator::unlock_method(bool check_exceptions) {
   __ unlock_object(R26_monitor, check_exceptions);
 }
 // Lock the current method, interpreter register window must be set up!
 void TemplateInterpreterGenerator::lock_method(Register Rflags, Register Rscratch1, Register Rscratch2, bool flags_preloaded) {
   const Register Robj_to_lock = Rscratch2;
   {
     if (!flags_preloaded) {
       __ lwz(Rflags, method_(access_flags));
     }
 #ifdef ASSERT
     // Check if methods needs synchronization.
     {
       Label Lok;
       __ testbitdi(CCR0, R0, Rflags, JVM_ACC_SYNCHRONIZED_BIT);
       __ btrue(CCR0,Lok);
       __ stop("method doesn't need synchronization");
       __ bind(Lok);
     }
 #endif // ASSERT
   }
   // Get synchronization object to Rscratch2.
   {
     const int mirror_offset = in_bytes(Klass::java_mirror_offset());
     Label Lstatic;
     Label Ldone;
     __ testbitdi(CCR0, R0, Rflags, JVM_ACC_STATIC_BIT);
     __ btrue(CCR0, Lstatic);
     // Non-static case: load receiver obj from stack and we're done.
     __ ld(Robj_to_lock, R18_locals);
     __ b(Ldone);
     __ bind(Lstatic); // Static case: Lock the java mirror
     __ ld(Robj_to_lock, in_bytes(Method::const_offset()), R19_method);
     __ ld(Robj_to_lock, in_bytes(ConstMethod::constants_offset()), Robj_to_lock);
     __ ld(Robj_to_lock, ConstantPool::pool_holder_offset_in_bytes(), Robj_to_lock);
     __ ld(Robj_to_lock, mirror_offset, Robj_to_lock);
     __ bind(Ldone);
     __ verify_oop(Robj_to_lock);
   }
   // Got the oop to lock => execute!
   __ add_monitor_to_stack(true, Rscratch1, R0);
   __ std(Robj_to_lock, BasicObjectLock::obj_offset_in_bytes(), R26_monitor);
   __ lock_object(R26_monitor, Robj_to_lock);
 }
 // Generate a fixed interpreter frame for pure interpreter
 // and I2N native transition frames.
 //
 // Before (stack grows downwards):
 //
 //         |  ...         |
 //         |------------- |
 //         |  java arg0   |
 //         |  ...         |
 //         |  java argn   |
 //         |              |   <-   R15_esp
 //         |              |
 //         |--------------|
 //         | abi_112      |
 //         |              |   <-   R1_SP
 //         |==============|
 //
 //
 // After:
 //
 //         |  ...         |
 //         |  java arg0   |<-   R18_locals
 //         |  ...         |
 //         |  java argn   |
 //         |--------------|
 //         |              |
 //         |  java locals |
 //         |              |
 //         |--------------|
 //         |  abi_48      |
 //         |==============|
 //         |              |
 //         |   istate     |
 //         |              |
 //         |--------------|
 //         |   monitor    |<-   R26_monitor
 //         |--------------|
 //         |              |<-   R15_esp
 //         | expression   |
 //         | stack        |
 //         |              |
 //         |--------------|
 //         |              |
 //         | abi_112      |<-   R1_SP
 //         |==============|
 //
 // The top most frame needs an abi space of 112 bytes. This space is needed,
 // since we call to c. The c function may spill their arguments to the caller
 // frame. When we call to java, we don't need these spill slots. In order to save
 // space on the stack, we resize the caller. However, java local reside in
 // the caller frame and the frame has to be increased. The frame_size for the
 // current frame was calculated based on max_stack as size for the expression
 // stack. At the call, just a part of the expression stack might be used.
 // We don't want to waste this space and cut the frame back accordingly.
 // The resulting amount for resizing is calculated as follows:
 // resize =   (number_of_locals - number_of_arguments) * slot_size
 //          + (R1_SP - R15_esp) + 48
 //
 // The size for the callee frame is calculated:
 // framesize = 112 + max_stack + monitor + state_size
 //
 // maxstack:   Max number of slots on the expression stack, loaded from the method.
 // monitor:    We statically reserve room for one monitor object.
 // state_size: We save the current state of the interpreter to this area.
 //
 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call, Register Rsize_of_parameters, Register Rsize_of_locals) {
   Register parent_frame_resize = R6_ARG4, // Frame will grow by this number of bytes.
            top_frame_size      = R7_ARG5,
            Rconst_method       = R8_ARG6;
   assert_different_registers(Rsize_of_parameters, Rsize_of_locals, parent_frame_resize, top_frame_size);
   __ ld(Rconst_method, method_(const));
   __ lhz(Rsize_of_parameters /* number of params */,
          in_bytes(ConstMethod::size_of_parameters_offset()), Rconst_method);
   if (native_call) {
     // If we're calling a native method, we reserve space for the worst-case signature
     // handler varargs vector, which is max(Argument::n_register_parameters, parameter_count+2).
     // We add two slots to the parameter_count, one for the jni
     // environment and one for a possible native mirror.
     Label skip_native_calculate_max_stack;
     __ addi(top_frame_size, Rsize_of_parameters, 2);
     __ cmpwi(CCR0, top_frame_size, Argument::n_register_parameters);
     __ bge(CCR0, skip_native_calculate_max_stack);
     __ li(top_frame_size, Argument::n_register_parameters);
     __ bind(skip_native_calculate_max_stack);
     __ sldi(Rsize_of_parameters, Rsize_of_parameters, Interpreter::logStackElementSize);
     __ sldi(top_frame_size, top_frame_size, Interpreter::logStackElementSize);
     __ sub(parent_frame_resize, R1_SP, R15_esp); // <0, off by Interpreter::stackElementSize!
     assert(Rsize_of_locals == noreg, "Rsize_of_locals not initialized"); // Only relevant value is Rsize_of_parameters.
   } else {
     __ lhz(Rsize_of_locals /* number of params */, in_bytes(ConstMethod::size_of_locals_offset()), Rconst_method);
     __ sldi(Rsize_of_parameters, Rsize_of_parameters, Interpreter::logStackElementSize);
     __ sldi(Rsize_of_locals, Rsize_of_locals, Interpreter::logStackElementSize);
     __ lhz(top_frame_size, in_bytes(ConstMethod::max_stack_offset()), Rconst_method);
     __ sub(R11_scratch1, Rsize_of_locals, Rsize_of_parameters); // >=0
     __ sub(parent_frame_resize, R1_SP, R15_esp); // <0, off by Interpreter::stackElementSize!
     __ sldi(top_frame_size, top_frame_size, Interpreter::logStackElementSize);
     __ add(parent_frame_resize, parent_frame_resize, R11_scratch1);
   }
   // Compute top frame size.
   __ addi(top_frame_size, top_frame_size, frame::abi_reg_args_size + frame::ijava_state_size);
   // Cut back area between esp and max_stack.
   __ addi(parent_frame_resize, parent_frame_resize, frame::abi_minframe_size - Interpreter::stackElementSize);
   __ round_to(top_frame_size, frame::alignment_in_bytes);
   __ round_to(parent_frame_resize, frame::alignment_in_bytes);
   // parent_frame_resize = (locals-parameters) - (ESP-SP-ABI48) Rounded to frame alignment size.
   // Enlarge by locals-parameters (not in case of native_call), shrink by ESP-SP-ABI48.
   {
     // --------------------------------------------------------------------------
     // Stack overflow check
     Label cont;
     __ add(R11_scratch1, parent_frame_resize, top_frame_size);
     generate_stack_overflow_check(R11_scratch1, R12_scratch2);
   }
   // Set up interpreter state registers.
   __ add(R18_locals, R15_esp, Rsize_of_parameters);
   __ ld(R27_constPoolCache, in_bytes(ConstMethod::constants_offset()), Rconst_method);
   __ ld(R27_constPoolCache, ConstantPool::cache_offset_in_bytes(), R27_constPoolCache);
   // Set method data pointer.
   if (ProfileInterpreter) {
     Label zero_continue;
     __ ld(R28_mdx, method_(method_data));
     __ cmpdi(CCR0, R28_mdx, 0);
     __ beq(CCR0, zero_continue);
     __ addi(R28_mdx, R28_mdx, in_bytes(MethodData::data_offset()));
     __ bind(zero_continue);
   }
   if (native_call) {
     __ li(R14_bcp, 0); // Must initialize.
   } else {
     __ add(R14_bcp, in_bytes(ConstMethod::codes_offset()), Rconst_method);
   }
   // Resize parent frame.
   __ mflr(R12_scratch2);
   __ neg(parent_frame_resize, parent_frame_resize);
   __ resize_frame(parent_frame_resize, R11_scratch1);
   __ std(R12_scratch2, _abi(lr), R1_SP);
   __ addi(R26_monitor, R1_SP, - frame::ijava_state_size);
   __ addi(R15_esp, R26_monitor, - Interpreter::stackElementSize);
   // Store values.
   // R15_esp, R14_bcp, R26_monitor, R28_mdx are saved at java calls
   // in InterpreterMacroAssembler::call_from_interpreter.
   __ std(R19_method, _ijava_state_neg(method), R1_SP);
   __ std(R21_sender_SP, _ijava_state_neg(sender_sp), R1_SP);
   __ std(R27_constPoolCache, _ijava_state_neg(cpoolCache), R1_SP);
   __ std(R18_locals, _ijava_state_neg(locals), R1_SP);
   // Note: esp, bcp, monitor, mdx live in registers. Hence, the correct version can only
   // be found in the frame after save_interpreter_state is done. This is always true
   // for non-top frames. But when a signal occurs, dumping the top frame can go wrong,
   // because e.g. frame::interpreter_frame_bcp() will not access the correct value
   // (Enhanced Stack Trace).
   // The signal handler does not save the interpreter state into the frame.
   __ li(R0, 0);
 #ifdef ASSERT
   // Fill remaining slots with constants.
   __ load_const_optimized(R11_scratch1, 0x5afe);
   __ load_const_optimized(R12_scratch2, 0xdead);
 #endif
   // We have to initialize some frame slots for native calls (accessed by GC).
   if (native_call) {
     __ std(R26_monitor, _ijava_state_neg(monitors), R1_SP);
     __ std(R14_bcp, _ijava_state_neg(bcp), R1_SP);
     if (ProfileInterpreter) { __ std(R28_mdx, _ijava_state_neg(mdx), R1_SP); }
   }
 #ifdef ASSERT
   else {
     __ std(R12_scratch2, _ijava_state_neg(monitors), R1_SP);
     __ std(R12_scratch2, _ijava_state_neg(bcp), R1_SP);
     __ std(R12_scratch2, _ijava_state_neg(mdx), R1_SP);
   }
   __ std(R11_scratch1, _ijava_state_neg(ijava_reserved), R1_SP);
   __ std(R12_scratch2, _ijava_state_neg(esp), R1_SP);
   __ std(R12_scratch2, _ijava_state_neg(lresult), R1_SP);
   __ std(R12_scratch2, _ijava_state_neg(fresult), R1_SP);
 #endif
   __ subf(R12_scratch2, top_frame_size, R1_SP);
   __ std(R0, _ijava_state_neg(oop_tmp), R1_SP);
   __ std(R12_scratch2, _ijava_state_neg(top_frame_sp), R1_SP);
   // Push top frame.
   __ push_frame(top_frame_size, R11_scratch1);
 }
 // End of helpers
 // ============================================================================
 // Various method entries
 //
 // Empty method, generate a very fast return. We must skip this entry if
 // someone's debugging, indicated by the flag
 // "interp_mode" in the Thread obj.
 // Note: empty methods are generated mostly methods that do assertions, which are
 // disabled in the "java opt build".
 address TemplateInterpreterGenerator::generate_empty_entry(void) {
   if (!UseFastEmptyMethods) {
     NOT_PRODUCT(__ should_not_reach_here();)
     return Interpreter::entry_for_kind(Interpreter::zerolocals);
   }
   Label Lslow_path;
   const Register Rjvmti_mode = R11_scratch1;
   address entry = __ pc();
   __ lwz(Rjvmti_mode, thread_(interp_only_mode));
   __ cmpwi(CCR0, Rjvmti_mode, 0);
   __ bne(CCR0, Lslow_path); // jvmti_mode!=0
   // Noone's debuggin: Simply return.
   // Pop c2i arguments (if any) off when we return.
 #ifdef ASSERT
     __ ld(R9_ARG7, 0, R1_SP);
     __ ld(R10_ARG8, 0, R21_sender_SP);
     __ cmpd(CCR0, R9_ARG7, R10_ARG8);
     __ asm_assert_eq("backlink", 0x545);
 #endif // ASSERT
   __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
   // And we're done.
   __ blr();
   __ bind(Lslow_path);
   __ branch_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals), R11_scratch1);
   __ flush();
   return entry;
 }
 // Support abs and sqrt like in compiler.
 // For others we can use a normal (native) entry.
 inline bool math_entry_available(AbstractInterpreter::MethodKind kind) {
   // Provide math entry with debugging on demand.
   // Note: Debugging changes which code will get executed:
   // Debugging or disabled InlineIntrinsics: java method will get interpreted and performs a native call.
   // Not debugging and enabled InlineIntrinics: processor instruction will get used.
   // Result might differ slightly due to rounding etc.
   if (!InlineIntrinsics && (!FLAG_IS_ERGO(InlineIntrinsics))) return false; // Generate a vanilla entry.
   return ((kind==Interpreter::java_lang_math_sqrt && VM_Version::has_fsqrt()) ||
           (kind==Interpreter::java_lang_math_abs));
 }
 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
   if (!math_entry_available(kind)) {
     NOT_PRODUCT(__ should_not_reach_here();)
     return Interpreter::entry_for_kind(Interpreter::zerolocals);
   }
   Label Lslow_path;
   const Register Rjvmti_mode = R11_scratch1;
   address entry = __ pc();
   // Provide math entry with debugging on demand.
   __ lwz(Rjvmti_mode, thread_(interp_only_mode));
   __ cmpwi(CCR0, Rjvmti_mode, 0);
   __ bne(CCR0, Lslow_path); // jvmti_mode!=0
   __ lfd(F1_RET, Interpreter::stackElementSize, R15_esp);
   // Pop c2i arguments (if any) off when we return.
 #ifdef ASSERT
   __ ld(R9_ARG7, 0, R1_SP);
   __ ld(R10_ARG8, 0, R21_sender_SP);
   __ cmpd(CCR0, R9_ARG7, R10_ARG8);
   __ asm_assert_eq("backlink", 0x545);
 #endif // ASSERT
   __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
   if (kind == Interpreter::java_lang_math_sqrt) {
     __ fsqrt(F1_RET, F1_RET);
   } else if (kind == Interpreter::java_lang_math_abs) {
     __ fabs(F1_RET, F1_RET);
   } else {
     ShouldNotReachHere();
   }
   // And we're done.
   __ blr();
   // Provide slow path for JVMTI case.
   __ bind(Lslow_path);
   __ branch_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals), R12_scratch2);
   __ flush();
   return entry;
 }
 // Interpreter stub for calling a native method. (asm interpreter)
 // This sets up a somewhat different looking stack for calling the
 // native method than the typical interpreter frame setup.
 //
 // On entry:
 //   R19_method    - method
 //   R16_thread    - JavaThread*
 //   R15_esp       - intptr_t* sender tos
 //
 //   abstract stack (grows up)
 //     [  IJava (caller of JNI callee)  ]  <-- ASP
 //        ...
 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
   address entry = __ pc();
   const bool inc_counter = UseCompiler || CountCompiledCalls;
   // -----------------------------------------------------------------------------
   // Allocate a new frame that represents the native callee (i2n frame).
   // This is not a full-blown interpreter frame, but in particular, the
   // following registers are valid after this:
   // - R19_method
   // - R18_local (points to start of argumuments to native function)
   //
   //   abstract stack (grows up)
   //     [  IJava (caller of JNI callee)  ]  <-- ASP
   //        ...
   const Register signature_handler_fd = R11_scratch1;
   const Register pending_exception    = R0;
   const Register result_handler_addr  = R31;
   const Register native_method_fd     = R11_scratch1;
   const Register access_flags         = R22_tmp2;
   const Register active_handles       = R11_scratch1; // R26_monitor saved to state.
   const Register sync_state           = R12_scratch2;
   const Register sync_state_addr      = sync_state;   // Address is dead after use.
   const Register suspend_flags        = R11_scratch1;
   //=============================================================================
   // Allocate new frame and initialize interpreter state.
   Label exception_return;
   Label exception_return_sync_check;
   Label stack_overflow_return;
   // Generate new interpreter state and jump to stack_overflow_return in case of
   // a stack overflow.
   //generate_compute_interpreter_state(stack_overflow_return);
   Register size_of_parameters = R22_tmp2;
   generate_fixed_frame(true, size_of_parameters, noreg /* unused */);
   //=============================================================================
   // Increment invocation counter. On overflow, entry to JNI method
   // will be compiled.
   Label invocation_counter_overflow, continue_after_compile;
   if (inc_counter) {
     if (synchronized) {
       // Since at this point in the method invocation the exception handler
       // would try to exit the monitor of synchronized methods which hasn't
       // been entered yet, we set the thread local variable
       // _do_not_unlock_if_synchronized to true. If any exception was thrown by
       // runtime, exception handling i.e. unlock_if_synchronized_method will
       // check this thread local flag.
       // This flag has two effects, one is to force an unwind in the topmost
       // interpreter frame and not perform an unlock while doing so.
       __ li(R0, 1);
       __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
     }
     generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
     __ BIND(continue_after_compile);
     // Reset the _do_not_unlock_if_synchronized flag.
     if (synchronized) {
       __ li(R0, 0);
       __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
     }
   }
   // access_flags = method->access_flags();
   // Load access flags.
   assert(access_flags->is_nonvolatile(),
          "access_flags must be in a non-volatile register");
   // Type check.
   assert(4 == sizeof(AccessFlags), "unexpected field size");
   __ lwz(access_flags, method_(access_flags));
   // We don't want to reload R19_method and access_flags after calls
   // to some helper functions.
   assert(R19_method->is_nonvolatile(),
          "R19_method must be a non-volatile register");
   // Check for synchronized methods. Must happen AFTER invocation counter
   // check, so method is not locked if counter overflows.
   if (synchronized) {
     lock_method(access_flags, R11_scratch1, R12_scratch2, true);
     // Update monitor in state.
     __ ld(R11_scratch1, 0, R1_SP);
     __ std(R26_monitor, _ijava_state_neg(monitors), R11_scratch1);
   }
   // jvmti/jvmpi support
   __ notify_method_entry();
   //=============================================================================
   // Get and call the signature handler.
   __ ld(signature_handler_fd, method_(signature_handler));
   Label call_signature_handler;
   __ cmpdi(CCR0, signature_handler_fd, 0);
   __ bne(CCR0, call_signature_handler);
   // Method has never been called. Either generate a specialized
   // handler or point to the slow one.
   //
   // Pass parameter 'false' to avoid exception check in call_VM.
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), R19_method, false);
   // Check for an exception while looking up the target method. If we
   // incurred one, bail.
   __ ld(pending_exception, thread_(pending_exception));
   __ cmpdi(CCR0, pending_exception, 0);
   __ bne(CCR0, exception_return_sync_check); // Has pending exception.
   // Reload signature handler, it may have been created/assigned in the meanwhile.
   __ ld(signature_handler_fd, method_(signature_handler));
   __ twi_0(signature_handler_fd); // Order wrt. load of klass mirror and entry point (isync is below).
   __ BIND(call_signature_handler);
   // Before we call the signature handler we push a new frame to
   // protect the interpreter frame volatile registers when we return
   // from jni but before we can get back to Java.
   // First set the frame anchor while the SP/FP registers are
   // convenient and the slow signature handler can use this same frame
   // anchor.
   // We have a TOP_IJAVA_FRAME here, which belongs to us.
   __ set_top_ijava_frame_at_SP_as_last_Java_frame(R1_SP, R12_scratch2/*tmp*/);
   // Now the interpreter frame (and its call chain) have been
   // invalidated and flushed. We are now protected against eager
   // being enabled in native code. Even if it goes eager the
   // registers will be reloaded as clean and we will invalidate after
   // the call so no spurious flush should be possible.
   // Call signature handler and pass locals address.
   //
   // Our signature handlers copy required arguments to the C stack
   // (outgoing C args), R3_ARG1 to R10_ARG8, and FARG1 to FARG13.
   __ mr(R3_ARG1, R18_locals);
   __ ld(signature_handler_fd, 0, signature_handler_fd);
   __ call_stub(signature_handler_fd);
   // Remove the register parameter varargs slots we allocated in
   // compute_interpreter_state. SP+16 ends up pointing to the ABI
   // outgoing argument area.
   //
   // Not needed on PPC64.
   //__ add(SP, SP, Argument::n_register_parameters*BytesPerWord);
   assert(result_handler_addr->is_nonvolatile(), "result_handler_addr must be in a non-volatile register");
   // Save across call to native method.
   __ mr(result_handler_addr, R3_RET);
   __ isync(); // Acquire signature handler before trying to fetch the native entry point and klass mirror.
   // Set up fixed parameters and call the native method.
   // If the method is static, get mirror into R4_ARG2.
   {
     Label method_is_not_static;
     // Access_flags is non-volatile and still, no need to restore it.
     // Restore access flags.
     __ testbitdi(CCR0, R0, access_flags, JVM_ACC_STATIC_BIT);
     __ bfalse(CCR0, method_is_not_static);
     // constants = method->constants();
     __ ld(R11_scratch1, in_bytes(Method::const_offset()), R19_method);
     __ ld(R11_scratch1, in_bytes(ConstMethod::constants_offset()), R11_scratch1);
     // pool_holder = method->constants()->pool_holder();
     __ ld(R11_scratch1/*pool_holder*/, ConstantPool::pool_holder_offset_in_bytes(),
           R11_scratch1/*constants*/);
     const int mirror_offset = in_bytes(Klass::java_mirror_offset());
     // mirror = pool_holder->klass_part()->java_mirror();
     __ ld(R0/*mirror*/, mirror_offset, R11_scratch1/*pool_holder*/);
     // state->_native_mirror = mirror;
     __ ld(R11_scratch1, 0, R1_SP);
     __ std(R0/*mirror*/, _ijava_state_neg(oop_tmp), R11_scratch1);
     // R4_ARG2 = &state->_oop_temp;
     __ addi(R4_ARG2, R11_scratch1, _ijava_state_neg(oop_tmp));
     __ BIND(method_is_not_static);
   }
   // At this point, arguments have been copied off the stack into
   // their JNI positions. Oops are boxed in-place on the stack, with
   // handles copied to arguments. The result handler address is in a
   // register.
   // Pass JNIEnv address as first parameter.
   __ addir(R3_ARG1, thread_(jni_environment));
   // Load the native_method entry before we change the thread state.
   __ ld(native_method_fd, method_(native_function));
   //=============================================================================
   // Transition from _thread_in_Java to _thread_in_native. As soon as
   // we make this change the safepoint code needs to be certain that
   // the last Java frame we established is good. The pc in that frame
   // just needs to be near here not an actual return address.
   // We use release_store_fence to update values like the thread state, where
   // we don't want the current thread to continue until all our prior memory
   // accesses (including the new thread state) are visible to other threads.
   __ li(R0, _thread_in_native);
   __ release();
   // TODO PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size");
   __ stw(R0, thread_(thread_state));
   if (UseMembar) {
     __ fence();
   }
   //=============================================================================
   // Call the native method. Argument registers must not have been
   // overwritten since "__ call_stub(signature_handler);" (except for
   // ARG1 and ARG2 for static methods).
   __ call_c(native_method_fd);
   __ li(R0, 0);
   __ ld(R11_scratch1, 0, R1_SP);
   __ std(R3_RET, _ijava_state_neg(lresult), R11_scratch1);
   __ stfd(F1_RET, _ijava_state_neg(fresult), R11_scratch1);
   __ std(R0/*mirror*/, _ijava_state_neg(oop_tmp), R11_scratch1); // reset
   // Note: C++ interpreter needs the following here:
   // The frame_manager_lr field, which we use for setting the last
   // java frame, gets overwritten by the signature handler. Restore
   // it now.
   //__ get_PC_trash_LR(R11_scratch1);
   //__ std(R11_scratch1, _top_ijava_frame_abi(frame_manager_lr), R1_SP);
   // Because of GC R19_method may no longer be valid.
   // Block, if necessary, before resuming in _thread_in_Java state.
   // In order for GC to work, don't clear the last_Java_sp until after
   // blocking.
   //=============================================================================
   // Switch thread to "native transition" state before reading the
   // synchronization state. This additional state is necessary
   // because reading and testing the synchronization state is not
   // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
   // in _thread_in_native state, loads _not_synchronized and is
   // preempted. VM thread changes sync state to synchronizing and
   // suspends threads for GC. Thread A is resumed to finish this
   // native method, but doesn't block here since it didn't see any
   // synchronization in progress, and escapes.
   // We use release_store_fence to update values like the thread state, where
   // we don't want the current thread to continue until all our prior memory
   // accesses (including the new thread state) are visible to other threads.
   __ li(R0/*thread_state*/, _thread_in_native_trans);
   __ release();
   __ stw(R0/*thread_state*/, thread_(thread_state));
   if (UseMembar) {
     __ fence();
   }
   // Write serialization page so that the VM thread can do a pseudo remote
   // membar. We use the current thread pointer to calculate a thread
   // specific offset to write to within the page. This minimizes bus
   // traffic due to cache line collision.
   else {
     __ serialize_memory(R16_thread, R11_scratch1, R12_scratch2);
   }
   // Now before we return to java we must look for a current safepoint
   // (a new safepoint can not start since we entered native_trans).
   // We must check here because a current safepoint could be modifying
   // the callers registers right this moment.
   // Acquire isn't strictly necessary here because of the fence, but
   // sync_state is declared to be volatile, so we do it anyway
   // (cmp-br-isync on one path, release (same as acquire on PPC64) on the other path).
   int sync_state_offs = __ load_const_optimized(sync_state_addr, SafepointSynchronize::address_of_state(), /*temp*/R0, true);
   // TODO PPC port assert(4 == SafepointSynchronize::sz_state(), "unexpected field size");
   __ lwz(sync_state, sync_state_offs, sync_state_addr);
   // TODO PPC port assert(4 == Thread::sz_suspend_flags(), "unexpected field size");
   __ lwz(suspend_flags, thread_(suspend_flags));
   Label sync_check_done;
   Label do_safepoint;
   // No synchronization in progress nor yet synchronized.
   __ cmpwi(CCR0, sync_state, SafepointSynchronize::_not_synchronized);
   // Not suspended.
   __ cmpwi(CCR1, suspend_flags, 0);
   __ bne(CCR0, do_safepoint);
   __ beq(CCR1, sync_check_done);
   __ bind(do_safepoint);
   __ isync();
   // Block. We do the call directly and leave the current
   // last_Java_frame setup undisturbed. We must save any possible
   // native result across the call. No oop is present.
   __ mr(R3_ARG1, R16_thread);
   __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, JavaThread::check_special_condition_for_native_trans),
             relocInfo::none);
   __ bind(sync_check_done);
   //=============================================================================
   // <<<<<< Back in Interpreter Frame >>>>>
   // We are in thread_in_native_trans here and back in the normal
   // interpreter frame. We don't have to do anything special about
   // safepoints and we can switch to Java mode anytime we are ready.
   // Note: frame::interpreter_frame_result has a dependency on how the
   // method result is saved across the call to post_method_exit. For
   // native methods it assumes that the non-FPU/non-void result is
   // saved in _native_lresult and a FPU result in _native_fresult. If
   // this changes then the interpreter_frame_result implementation
   // will need to be updated too.
   // On PPC64, we have stored the result directly after the native call.
   //=============================================================================
   // Back in Java
   // We use release_store_fence to update values like the thread state, where
   // we don't want the current thread to continue until all our prior memory
   // accesses (including the new thread state) are visible to other threads.
   __ li(R0/*thread_state*/, _thread_in_Java);
   __ release();
   __ stw(R0/*thread_state*/, thread_(thread_state));
   if (UseMembar) {
     __ fence();
   }
   __ reset_last_Java_frame();
   // Jvmdi/jvmpi support. Whether we've got an exception pending or
   // not, and whether unlocking throws an exception or not, we notify
   // on native method exit. If we do have an exception, we'll end up
   // in the caller's context to handle it, so if we don't do the
   // notify here, we'll drop it on the floor.
   __ notify_method_exit(true/*native method*/,
                         ilgl /*illegal state (not used for native methods)*/,
                         InterpreterMacroAssembler::NotifyJVMTI,
                         false /*check_exceptions*/);
   //=============================================================================
   // Handle exceptions
   if (synchronized) {
     // Don't check for exceptions since we're still in the i2n frame. Do that
     // manually afterwards.
     unlock_method(false);
   }
   // Reset active handles after returning from native.
   // thread->active_handles()->clear();
   __ ld(active_handles, thread_(active_handles));
   // TODO PPC port assert(4 == JNIHandleBlock::top_size_in_bytes(), "unexpected field size");
   __ li(R0, 0);
   __ stw(R0, JNIHandleBlock::top_offset_in_bytes(), active_handles);
   Label exception_return_sync_check_already_unlocked;
   __ ld(R0/*pending_exception*/, thread_(pending_exception));
   __ cmpdi(CCR0, R0/*pending_exception*/, 0);
   __ bne(CCR0, exception_return_sync_check_already_unlocked);
   //-----------------------------------------------------------------------------
   // No exception pending.
   // Move native method result back into proper registers and return.
   // Invoke result handler (may unbox/promote).
   __ ld(R11_scratch1, 0, R1_SP);
   __ ld(R3_RET, _ijava_state_neg(lresult), R11_scratch1);
   __ lfd(F1_RET, _ijava_state_neg(fresult), R11_scratch1);
   __ call_stub(result_handler_addr);
   __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ R0, R11_scratch1, R12_scratch2);
   // Must use the return pc which was loaded from the caller's frame
   // as the VM uses return-pc-patching for deoptimization.
   __ mtlr(R0);
   __ blr();
   //-----------------------------------------------------------------------------
   // An exception is pending. We call into the runtime only if the
   // caller was not interpreted. If it was interpreted the
   // interpreter will do the correct thing. If it isn't interpreted
   // (call stub/compiled code) we will change our return and continue.
   __ BIND(exception_return_sync_check);
   if (synchronized) {
     // Don't check for exceptions since we're still in the i2n frame. Do that
     // manually afterwards.
     unlock_method(false);
   }
   __ BIND(exception_return_sync_check_already_unlocked);
   const Register return_pc = R31;
   __ ld(return_pc, 0, R1_SP);
   __ ld(return_pc, _abi(lr), return_pc);
   // Get the address of the exception handler.
   __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address),
                   R16_thread,
                   return_pc /* return pc */);
   __ merge_frames(/*top_frame_sp*/ R21_sender_SP, noreg, R11_scratch1, R12_scratch2);
   // Load the PC of the the exception handler into LR.
   __ mtlr(R3_RET);
   // Load exception into R3_ARG1 and clear pending exception in thread.
   __ ld(R3_ARG1/*exception*/, thread_(pending_exception));
   __ li(R4_ARG2, 0);
   __ std(R4_ARG2, thread_(pending_exception));
   // Load the original return pc into R4_ARG2.
   __ mr(R4_ARG2/*issuing_pc*/, return_pc);
   // Return to exception handler.
   __ blr();
   //=============================================================================
   // Counter overflow.
   if (inc_counter) {
     // Handle invocation counter overflow.
     __ bind(invocation_counter_overflow);
     generate_counter_overflow(continue_after_compile);
   }
   return entry;
 }
 // Generic interpreted method entry to (asm) interpreter.
 //
 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
   bool inc_counter = UseCompiler || CountCompiledCalls;
   address entry = __ pc();
   // Generate the code to allocate the interpreter stack frame.
   Register Rsize_of_parameters = R4_ARG2, // Written by generate_fixed_frame.
            Rsize_of_locals     = R5_ARG3; // Written by generate_fixed_frame.
   generate_fixed_frame(false, Rsize_of_parameters, Rsize_of_locals);
 #ifdef FAST_DISPATCH
   __ unimplemented("Fast dispatch in generate_normal_entry");
 #if 0
   __ set((intptr_t)Interpreter::dispatch_table(), IdispatchTables);
   // Set bytecode dispatch table base.
 #endif
 #endif
   // --------------------------------------------------------------------------
   // Zero out non-parameter locals.
   // Note: *Always* zero out non-parameter locals as Sparc does. It's not
   // worth to ask the flag, just do it.
   Register Rslot_addr = R6_ARG4,
            Rnum       = R7_ARG5;
   Label Lno_locals, Lzero_loop;
   // Set up the zeroing loop.
   __ subf(Rnum, Rsize_of_parameters, Rsize_of_locals);
   __ subf(Rslot_addr, Rsize_of_parameters, R18_locals);
   __ srdi_(Rnum, Rnum, Interpreter::logStackElementSize);
   __ beq(CCR0, Lno_locals);
   __ li(R0, 0);
   __ mtctr(Rnum);
   // The zero locals loop.
   __ bind(Lzero_loop);
   __ std(R0, 0, Rslot_addr);
   __ addi(Rslot_addr, Rslot_addr, -Interpreter::stackElementSize);
   __ bdnz(Lzero_loop);
   __ bind(Lno_locals);
   // --------------------------------------------------------------------------
   // Counter increment and overflow check.
   Label invocation_counter_overflow,
         profile_method,
         profile_method_continue;
   if (inc_counter || ProfileInterpreter) {
     Register Rdo_not_unlock_if_synchronized_addr = R11_scratch1;
     if (synchronized) {
       // Since at this point in the method invocation the exception handler
       // would try to exit the monitor of synchronized methods which hasn't
       // been entered yet, we set the thread local variable
       // _do_not_unlock_if_synchronized to true. If any exception was thrown by
       // runtime, exception handling i.e. unlock_if_synchronized_method will
       // check this thread local flag.
       // This flag has two effects, one is to force an unwind in the topmost
       // interpreter frame and not perform an unlock while doing so.
       __ li(R0, 1);
       __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
     }
     // Increment invocation counter and check for overflow.
     if (inc_counter) {
       generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
     }
     __ bind(profile_method_continue);
     // Reset the _do_not_unlock_if_synchronized flag.
     if (synchronized) {
       __ li(R0, 0);
       __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
     }
   }
   // --------------------------------------------------------------------------
   // Locking of synchronized methods. Must happen AFTER invocation_counter
   // check and stack overflow check, so method is not locked if overflows.
   if (synchronized) {
     lock_method(R3_ARG1, R4_ARG2, R5_ARG3);
   }
 #ifdef ASSERT
   else {
     Label Lok;
     __ lwz(R0, in_bytes(Method::access_flags_offset()), R19_method);
     __ andi_(R0, R0, JVM_ACC_SYNCHRONIZED);
     __ asm_assert_eq("method needs synchronization", 0x8521);
     __ bind(Lok);
   }
 #endif // ASSERT
   __ verify_thread();
   // --------------------------------------------------------------------------
   // JVMTI support
   __ notify_method_entry();
   // --------------------------------------------------------------------------
   // Start executing instructions.
   __ dispatch_next(vtos);
   // --------------------------------------------------------------------------
   // Out of line counter overflow and MDO creation code.
   if (ProfileInterpreter) {
     // We have decided to profile this method in the interpreter.
     __ bind(profile_method);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
     __ set_method_data_pointer_for_bcp();
     __ b(profile_method_continue);
   }
   if (inc_counter) {
     // Handle invocation counter overflow.
     __ bind(invocation_counter_overflow);
     generate_counter_overflow(profile_method_continue);
   }
   return entry;
 }
 // =============================================================================
 // Entry points
 address AbstractInterpreterGenerator::generate_method_entry(
                                         AbstractInterpreter::MethodKind kind) {
   // Determine code generation flags.
   bool synchronized = false;
   address entry_point = NULL;
   switch (kind) {
   case Interpreter::zerolocals             :                                                                             break;
   case Interpreter::zerolocals_synchronized: synchronized = true;                                                        break;
   case Interpreter::native                 : entry_point = ((InterpreterGenerator*) this)->generate_native_entry(false); break;
   case Interpreter::native_synchronized    : entry_point = ((InterpreterGenerator*) this)->generate_native_entry(true);  break;
   case Interpreter::empty                  : entry_point = ((InterpreterGenerator*) this)->generate_empty_entry();       break;
   case Interpreter::accessor               : entry_point = ((InterpreterGenerator*) this)->generate_accessor_entry();    break;
   case Interpreter::abstract               : entry_point = ((InterpreterGenerator*) this)->generate_abstract_entry();    break;
   case Interpreter::java_lang_math_sin     : // fall thru
   case Interpreter::java_lang_math_cos     : // fall thru
   case Interpreter::java_lang_math_tan     : // fall thru
   case Interpreter::java_lang_math_abs     : // fall thru
   case Interpreter::java_lang_math_log     : // fall thru
   case Interpreter::java_lang_math_log10   : // fall thru
   case Interpreter::java_lang_math_sqrt    : // fall thru
   case Interpreter::java_lang_math_pow     : // fall thru
   case Interpreter::java_lang_math_exp     : entry_point = ((InterpreterGenerator*) this)->generate_math_entry(kind);    break;
   case Interpreter::java_lang_ref_reference_get
                                            : entry_point = ((InterpreterGenerator*)this)->generate_Reference_get_entry(); break;
   default                                  : ShouldNotReachHere();                                                       break;
   }
   if (entry_point) {
     return entry_point;
   }
   return ((InterpreterGenerator*) this)->generate_normal_entry(synchronized);
 }
 // These should never be compiled since the interpreter will prefer
 // the compiled version to the intrinsic version.
 bool AbstractInterpreter::can_be_compiled(methodHandle m) {
   return !math_entry_available(method_kind(m));
 }
 // How much stack a method activation needs in stack slots.
 // We must calc this exactly like in generate_fixed_frame.
 // Note: This returns the conservative size assuming maximum alignment.
 int AbstractInterpreter::size_top_interpreter_activation(Method* method) {
   const int max_alignment_size = 2;
   const int abi_scratch = frame::abi_reg_args_size;
   return method->max_locals() + method->max_stack() +
          frame::interpreter_frame_monitor_size() + max_alignment_size + abi_scratch;
 }
 // Returns number of stackElementWords needed for the interpreter frame with the
 // given sections.
 // This overestimates the stack by one slot in case of alignments.
 int AbstractInterpreter::size_activation(int max_stack,
                                          int temps,
                                          int extra_args,
                                          int monitors,
                                          int callee_params,
                                          int callee_locals,
                                          bool is_top_frame) {
   // Note: This calculation must exactly parallel the frame setup
   // in AbstractInterpreterGenerator::generate_method_entry.
   assert(Interpreter::stackElementWords == 1, "sanity");
   const int max_alignment_space = StackAlignmentInBytes / Interpreter::stackElementSize;
   const int abi_scratch = is_top_frame ? (frame::abi_reg_args_size / Interpreter::stackElementSize) :
                                          (frame::abi_minframe_size / Interpreter::stackElementSize);
   const int size =
     max_stack                                                +
     (callee_locals - callee_params)                          +
     monitors * frame::interpreter_frame_monitor_size()       +
     max_alignment_space                                      +
     abi_scratch                                              +
     frame::ijava_state_size / Interpreter::stackElementSize;
   // Fixed size of an interpreter frame, align to 16-byte.
   return (size & -2);
 }
 // Fills a sceletal interpreter frame generated during deoptimizations.
 //
 // Parameters:
 //
 // interpreter_frame != NULL:
 //   set up the method, locals, and monitors.
 //   The frame interpreter_frame, if not NULL, is guaranteed to be the
 //   right size, as determined by a previous call to this method.
 //   It is also guaranteed to be walkable even though it is in a skeletal state
 //
 // is_top_frame == true:
 //   We're processing the *oldest* interpreter frame!
 //
 // pop_frame_extra_args:
 //   If this is != 0 we are returning to a deoptimized frame by popping
 //   off the callee frame. We want to re-execute the call that called the
 //   callee interpreted, but since the return to the interpreter would pop
 //   the arguments off advance the esp by dummy popframe_extra_args slots.
 //   Popping off those will establish the stack layout as it was before the call.
 //
 void AbstractInterpreter::layout_activation(Method* method,
                                             int tempcount,
                                             int popframe_extra_args,
                                             int moncount,
                                             int caller_actual_parameters,
                                             int callee_param_count,
                                             int callee_locals_count,
                                             frame* caller,
                                             frame* interpreter_frame,
                                             bool is_top_frame,
                                             bool is_bottom_frame) {
   const int abi_scratch = is_top_frame ? (frame::abi_reg_args_size / Interpreter::stackElementSize) :
                                          (frame::abi_minframe_size / Interpreter::stackElementSize);
   intptr_t* locals_base  = (caller->is_interpreted_frame()) ?
     caller->interpreter_frame_esp() + caller_actual_parameters :
     caller->sp() + method->max_locals() - 1 + (frame::abi_minframe_size / Interpreter::stackElementSize) ;
   intptr_t* monitor_base = caller->sp() - frame::ijava_state_size / Interpreter::stackElementSize ;
   intptr_t* monitor      = monitor_base - (moncount * frame::interpreter_frame_monitor_size());
   intptr_t* esp_base     = monitor - 1;
   intptr_t* esp          = esp_base - tempcount - popframe_extra_args;
   intptr_t* sp           = (intptr_t *) (((intptr_t) (esp_base - callee_locals_count + callee_param_count - method->max_stack()- abi_scratch)) & -StackAlignmentInBytes);
   intptr_t* sender_sp    = caller->sp() + (frame::abi_minframe_size - frame::abi_reg_args_size) / Interpreter::stackElementSize;
   intptr_t* top_frame_sp = is_top_frame ? sp : sp + (frame::abi_minframe_size - frame::abi_reg_args_size) / Interpreter::stackElementSize;
   interpreter_frame->interpreter_frame_set_method(method);
   interpreter_frame->interpreter_frame_set_locals(locals_base);
   interpreter_frame->interpreter_frame_set_cpcache(method->constants()->cache());
   interpreter_frame->interpreter_frame_set_esp(esp);
   interpreter_frame->interpreter_frame_set_monitor_end((BasicObjectLock *)monitor);
   interpreter_frame->interpreter_frame_set_top_frame_sp(top_frame_sp);
   if (!is_bottom_frame) {
     interpreter_frame->interpreter_frame_set_sender_sp(sender_sp);
   }
 }
 // =============================================================================
 // Exceptions
 void TemplateInterpreterGenerator::generate_throw_exception() {
   Register Rexception    = R17_tos,
            Rcontinuation = R3_RET;
   // --------------------------------------------------------------------------
   // Entry point if an method returns with a pending exception (rethrow).
   Interpreter::_rethrow_exception_entry = __ pc();
   {
     __ restore_interpreter_state(R11_scratch1); // Sets R11_scratch1 = fp.
     __ ld(R12_scratch2, _ijava_state_neg(top_frame_sp), R11_scratch1);
     __ resize_frame_absolute(R12_scratch2, R11_scratch1, R0);
     // Compiled code destroys templateTableBase, reload.
     __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1);
   }
   // Entry point if a interpreted method throws an exception (throw).
   Interpreter::_throw_exception_entry = __ pc();
   {
     __ mr(Rexception, R3_RET);
     __ verify_thread();
     __ verify_oop(Rexception);
     // Expression stack must be empty before entering the VM in case of an exception.
     __ empty_expression_stack();
     // Find exception handler address and preserve exception oop.
     // Call C routine to find handler and jump to it.
     __ call_VM(Rexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), Rexception);
     __ mtctr(Rcontinuation);
     // Push exception for exception handler bytecodes.
     __ push_ptr(Rexception);
     // Jump to exception handler (may be remove activation entry!).
     __ bctr();
   }
   // If the exception is not handled in the current frame the frame is
   // removed and the exception is rethrown (i.e. exception
   // continuation is _rethrow_exception).
   //
   // Note: At this point the bci is still the bxi for the instruction
   // which caused the exception and the expression stack is
   // empty. Thus, for any VM calls at this point, GC will find a legal
   // oop map (with empty expression stack).
   // In current activation
   // tos: exception
   // bcp: exception bcp
   // --------------------------------------------------------------------------
   // JVMTI PopFrame support
   Interpreter::_remove_activation_preserving_args_entry = __ pc();
   {
     // Set the popframe_processing bit in popframe_condition indicating that we are
     // currently handling popframe, so that call_VMs that may happen later do not
     // trigger new popframe handling cycles.
     __ lwz(R11_scratch1, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
     __ ori(R11_scratch1, R11_scratch1, JavaThread::popframe_processing_bit);
     __ stw(R11_scratch1, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
     // Empty the expression stack, as in normal exception handling.
     __ empty_expression_stack();
     __ unlock_if_synchronized_method(vtos, /* throw_monitor_exception */ false, /* install_monitor_exception */ false);
     // Check to see whether we are returning to a deoptimized frame.
     // (The PopFrame call ensures that the caller of the popped frame is
     // either interpreted or compiled and deoptimizes it if compiled.)
     // Note that we don't compare the return PC against the
     // deoptimization blob's unpack entry because of the presence of
     // adapter frames in C2.
     Label Lcaller_not_deoptimized;
     Register return_pc = R3_ARG1;
     __ ld(return_pc, 0, R1_SP);
     __ ld(return_pc, _abi(lr), return_pc);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), return_pc);
     __ cmpdi(CCR0, R3_RET, 0);
     __ bne(CCR0, Lcaller_not_deoptimized);
     // The deoptimized case.
     // In this case, we can't call dispatch_next() after the frame is
     // popped, but instead must save the incoming arguments and restore
     // them after deoptimization has occurred.
     __ ld(R4_ARG2, in_bytes(Method::const_offset()), R19_method);
     __ lhz(R4_ARG2 /* number of params */, in_bytes(ConstMethod::size_of_parameters_offset()), R4_ARG2);
     __ slwi(R4_ARG2, R4_ARG2, Interpreter::logStackElementSize);
     __ addi(R5_ARG3, R18_locals, Interpreter::stackElementSize);
     __ subf(R5_ARG3, R4_ARG2, R5_ARG3);
     // Save these arguments.
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), R16_thread, R4_ARG2, R5_ARG3);
     // Inform deoptimization that it is responsible for restoring these arguments.
     __ load_const_optimized(R11_scratch1, JavaThread::popframe_force_deopt_reexecution_bit);
     __ stw(R11_scratch1, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
     // Return from the current method into the deoptimization blob. Will eventually
     // end up in the deopt interpeter entry, deoptimization prepared everything that
     // we will reexecute the call that called us.
     __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*reload return_pc*/ return_pc, R11_scratch1, R12_scratch2);
     __ mtlr(return_pc);
     __ blr();
     // The non-deoptimized case.
     __ bind(Lcaller_not_deoptimized);
     // Clear the popframe condition flag.
     __ li(R0, 0);
     __ stw(R0, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
     // Get out of the current method and re-execute the call that called us.
     __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ noreg, R11_scratch1, R12_scratch2);
     __ restore_interpreter_state(R11_scratch1);
     __ ld(R12_scratch2, _ijava_state_neg(top_frame_sp), R11_scratch1);
     __ resize_frame_absolute(R12_scratch2, R11_scratch1, R0);
     if (ProfileInterpreter) {
       __ set_method_data_pointer_for_bcp();
     }
 #if INCLUDE_JVMTI
     Label L_done;
     __ lbz(R11_scratch1, 0, R14_bcp);
     __ cmpwi(CCR0, R11_scratch1, Bytecodes::_invokestatic);
     __ bne(CCR0, L_done);
     // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
     // Detect such a case in the InterpreterRuntime function and return the member name argument, or NULL.
     __ ld(R4_ARG2, 0, R18_locals);
     __ call_VM(R11_scratch1, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
                R4_ARG2, R19_method, R14_bcp);
     __ cmpdi(CCR0, R11_scratch1, 0);
     __ beq(CCR0, L_done);
     __ std(R11_scratch1, wordSize, R15_esp);
     __ bind(L_done);
 #endif // INCLUDE_JVMTI
     __ dispatch_next(vtos);
   }
   // end of JVMTI PopFrame support
   // --------------------------------------------------------------------------
   // Remove activation exception entry.
   // This is jumped to if an interpreted method can't handle an exception itself
   // (we come from the throw/rethrow exception entry above). We're going to call
   // into the VM to find the exception handler in the caller, pop the current
   // frame and return the handler we calculated.
   Interpreter::_remove_activation_entry = __ pc();
   {
     __ pop_ptr(Rexception);
     __ verify_thread();
     __ verify_oop(Rexception);
     __ std(Rexception, in_bytes(JavaThread::vm_result_offset()), R16_thread);
     __ unlock_if_synchronized_method(vtos, /* throw_monitor_exception */ false, true);
     __ notify_method_exit(false, vtos, InterpreterMacroAssembler::SkipNotifyJVMTI, false);
     __ get_vm_result(Rexception);
     // We are done with this activation frame; find out where to go next.
     // The continuation point will be an exception handler, which expects
     // the following registers set up:
     //
     // RET:  exception oop
     // ARG2: Issuing PC (see generate_exception_blob()), only used if the caller is compiled.
     Register return_pc = R31; // Needs to survive the runtime call.
     __ ld(return_pc, 0, R1_SP);
     __ ld(return_pc, _abi(lr), return_pc);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), R16_thread, return_pc);
     // Remove the current activation.
     __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ noreg, R11_scratch1, R12_scratch2);
     __ mr(R4_ARG2, return_pc);
     __ mtlr(R3_RET);
     __ mr(R3_RET, Rexception);
     __ blr();
   }
 }
 // JVMTI ForceEarlyReturn support.
 // Returns "in the middle" of a method with a "fake" return value.
 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
   Register Rscratch1 = R11_scratch1,
            Rscratch2 = R12_scratch2;
   address entry = __ pc();
   __ empty_expression_stack();
   __ load_earlyret_value(state, Rscratch1);
   __ ld(Rscratch1, in_bytes(JavaThread::jvmti_thread_state_offset()), R16_thread);
   // Clear the earlyret state.
   __ li(R0, 0);
   __ stw(R0, in_bytes(JvmtiThreadState::earlyret_state_offset()), Rscratch1);
   __ remove_activation(state, false, false);
   // Copied from TemplateTable::_return.
   // Restoration of lr done by remove_activation.
   switch (state) {
     case ltos:
     case btos:
     case ctos:
     case stos:
     case atos:
     case itos: __ mr(R3_RET, R17_tos); break;
     case ftos:
     case dtos: __ fmr(F1_RET, F15_ftos); break;
     case vtos: // This might be a constructor. Final fields (and volatile fields on PPC64) need
                // to get visible before the reference to the object gets stored anywhere.
                __ membar(Assembler::StoreStore); break;
     default  : ShouldNotReachHere();
   }
   __ blr();
   return entry;
 } // end of ForceEarlyReturn support
 //-----------------------------------------------------------------------------
 // Helper for vtos entry point generation
 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
                                                          address& bep,
                                                          address& cep,
                                                          address& sep,
                                                          address& aep,
                                                          address& iep,
                                                          address& lep,
                                                          address& fep,
                                                          address& dep,
                                                          address& vep) {
   assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
   Label L;
   aep = __ pc();  __ push_ptr();  __ b(L);
   fep = __ pc();  __ push_f();    __ b(L);
   dep = __ pc();  __ push_d();    __ b(L);
   lep = __ pc();  __ push_l();    __ b(L);
   __ align(32, 12, 24); // align L
   bep = cep = sep =
   iep = __ pc();  __ push_i();
   vep = __ pc();
   __ bind(L);
   generate_and_dispatch(t);
 }
 //-----------------------------------------------------------------------------
 // Generation of individual instructions
 // helpers for generate_and_dispatch
 InterpreterGenerator::InterpreterGenerator(StubQueue* code)
   : TemplateInterpreterGenerator(code) {
   generate_all(); // Down here so it can be "virtual".
 }
 //-----------------------------------------------------------------------------
 // Non-product code
 #ifndef PRODUCT
 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
   //__ flush_bundle();
   address entry = __ pc();
   const char *bname = NULL;
   uint tsize = 0;
   switch(state) {
   case ftos:
     bname = "trace_code_ftos {";
     tsize = 2;
     break;
   case btos:
     bname = "trace_code_btos {";
     tsize = 2;
     break;
   case ctos:
     bname = "trace_code_ctos {";
     tsize = 2;
     break;
   case stos:
     bname = "trace_code_stos {";
     tsize = 2;
     break;
   case itos:
     bname = "trace_code_itos {";
     tsize = 2;
     break;
   case ltos:
     bname = "trace_code_ltos {";
     tsize = 3;
     break;
   case atos:
     bname = "trace_code_atos {";
     tsize = 2;
     break;
   case vtos:
     // Note: In case of vtos, the topmost of stack value could be a int or doubl
     // In case of a double (2 slots) we won't see the 2nd stack value.
     // Maybe we simply should print the topmost 3 stack slots to cope with the problem.
     bname = "trace_code_vtos {";
     tsize = 2;
     break;
   case dtos:
     bname = "trace_code_dtos {";
     tsize = 3;
     break;
   default:
     ShouldNotReachHere();
   }
   BLOCK_COMMENT(bname);
   // Support short-cut for TraceBytecodesAt.
   // Don't call into the VM if we don't want to trace to speed up things.
   Label Lskip_vm_call;
   if (TraceBytecodesAt > 0 && TraceBytecodesAt < max_intx) {
     int offs1 = __ load_const_optimized(R11_scratch1, (address) &TraceBytecodesAt, R0, true);
     int offs2 = __ load_const_optimized(R12_scratch2, (address) &BytecodeCounter::_counter_value, R0, true);
     __ ld(R11_scratch1, offs1, R11_scratch1);
     __ lwa(R12_scratch2, offs2, R12_scratch2);
     __ cmpd(CCR0, R12_scratch2, R11_scratch1);
     __ blt(CCR0, Lskip_vm_call);
   }
   __ push(state);
   // Load 2 topmost expression stack values.
   __ ld(R6_ARG4, tsize*Interpreter::stackElementSize, R15_esp);
   __ ld(R5_ARG3, Interpreter::stackElementSize, R15_esp);
   __ mflr(R31);
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::trace_bytecode), /* unused */ R4_ARG2, R5_ARG3, R6_ARG4, false);
   __ mtlr(R31);
   __ pop(state);
   if (TraceBytecodesAt > 0 && TraceBytecodesAt < max_intx) {
     __ bind(Lskip_vm_call);
   }
   __ blr();
   BLOCK_COMMENT("} trace_code");
   return entry;
 }
 void TemplateInterpreterGenerator::count_bytecode() {
   int offs = __ load_const_optimized(R11_scratch1, (address) &BytecodeCounter::_counter_value, R12_scratch2, true);
   __ lwz(R12_scratch2, offs, R11_scratch1);
   __ addi(R12_scratch2, R12_scratch2, 1);
   __ stw(R12_scratch2, offs, R11_scratch1);
 }
 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
   int offs = __ load_const_optimized(R11_scratch1, (address) &BytecodeHistogram::_counters[t->bytecode()], R12_scratch2, true);
   __ lwz(R12_scratch2, offs, R11_scratch1);
   __ addi(R12_scratch2, R12_scratch2, 1);
   __ stw(R12_scratch2, offs, R11_scratch1);
 }
 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
   const Register addr = R11_scratch1,
                  tmp  = R12_scratch2;
   // Get index, shift out old bytecode, bring in new bytecode, and store it.
   // _index = (_index >> log2_number_of_codes) |
   //          (bytecode << log2_number_of_codes);
   int offs1 = __ load_const_optimized(addr, (address)&BytecodePairHistogram::_index, tmp, true);
   __ lwz(tmp, offs1, addr);
   __ srwi(tmp, tmp, BytecodePairHistogram::log2_number_of_codes);
   __ ori(tmp, tmp, ((int) t->bytecode()) << BytecodePairHistogram::log2_number_of_codes);
   __ stw(tmp, offs1, addr);
   // Bump bucket contents.
   // _counters[_index] ++;
   int offs2 = __ load_const_optimized(addr, (address)&BytecodePairHistogram::_counters, R0, true);
   __ sldi(tmp, tmp, LogBytesPerInt);
   __ add(addr, tmp, addr);
   __ lwz(tmp, offs2, addr);
   __ addi(tmp, tmp, 1);
   __ stw(tmp, offs2, addr);
 }
 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
   // Call a little run-time stub to avoid blow-up for each bytecode.
   // The run-time runtime saves the right registers, depending on
   // the tosca in-state for the given template.
   assert(Interpreter::trace_code(t->tos_in()) != NULL,
          "entry must have been generated");
   // Note: we destroy LR here.
   __ bl(Interpreter::trace_code(t->tos_in()));
 }
 void TemplateInterpreterGenerator::stop_interpreter_at() {
   Label L;
   int offs1 = __ load_const_optimized(R11_scratch1, (address) &StopInterpreterAt, R0, true);
   int offs2 = __ load_const_optimized(R12_scratch2, (address) &BytecodeCounter::_counter_value, R0, true);
   __ ld(R11_scratch1, offs1, R11_scratch1);
   __ lwa(R12_scratch2, offs2, R12_scratch2);
   __ cmpd(CCR0, R12_scratch2, R11_scratch1);
   __ bne(CCR0, L);
   __ illtrap();
   __ bind(L);
 }
 #endif // !PRODUCT
 #endif // !CC_INTERP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/ppc/vm/templateInterpreter_ppc.cpp@0bf37f737702 (annotated)

src/cpu/ppc/vm/templateInterpreter_ppc.cpp