jdk8-mips64-public/hotspot: src/cpu/x86/vm/templateInterpreter_x86

src/cpu/x86/vm/templateInterpreter_x86_32.cpp@56aae7be60d4 (annotated)

src/cpu/x86/vm/templateInterpreter_x86_32.cpp

Wed, 04 Mar 2009 09:58:39 -0800

author: jrose
date: Wed, 04 Mar 2009 09:58:39 -0800
changeset 1057: 56aae7be60d4
parent 968: dc3ad84615cf
child 1063: 7bb995fbd3c0
permissions: -rw-r--r--

6812678: macro assembler needs delayed binding of a few constants (for 6655638)
Summary: minor assembler enhancements preparing for method handles
Reviewed-by: kvn

 /*
  * Copyright 1997-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_templateInterpreter_x86_32.cpp.incl"
 #define __ _masm->
 #ifndef CC_INTERP
 const int method_offset = frame::interpreter_frame_method_offset * wordSize;
 const int bci_offset    = frame::interpreter_frame_bcx_offset    * wordSize;
 const int locals_offset = frame::interpreter_frame_locals_offset * wordSize;
 //------------------------------------------------------------------------------------------------------------------------
 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
   address entry = __ pc();
   // Note: There should be a minimal interpreter frame set up when stack
   // overflow occurs since we check explicitly for it now.
   //
 #ifdef ASSERT
   { Label L;
     __ lea(rax, Address(rbp,
                 frame::interpreter_frame_monitor_block_top_offset * wordSize));
     __ cmpptr(rax, rsp);  // rax, = maximal rsp for current rbp,
                         //  (stack grows negative)
     __ jcc(Assembler::aboveEqual, L); // check if frame is complete
     __ stop ("interpreter frame not set up");
     __ bind(L);
   }
 #endif // ASSERT
   // Restore bcp under the assumption that the current frame is still
   // interpreted
   __ restore_bcp();
   // expression stack must be empty before entering the VM if an exception
   // happened
   __ empty_expression_stack();
   __ empty_FPU_stack();
   // throw exception
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
   return entry;
 }
 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(const char* name) {
   address entry = __ pc();
   // expression stack must be empty before entering the VM if an exception happened
   __ empty_expression_stack();
   __ empty_FPU_stack();
   // setup parameters
   // ??? convention: expect aberrant index in register rbx,
   __ lea(rax, ExternalAddress((address)name));
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException), rax, rbx);
   return entry;
 }
 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
   address entry = __ pc();
   // object is at TOS
   __ pop(rax);
   // expression stack must be empty before entering the VM if an exception
   // happened
   __ empty_expression_stack();
   __ empty_FPU_stack();
   __ call_VM(noreg,
              CAST_FROM_FN_PTR(address,
                               InterpreterRuntime::throw_ClassCastException),
              rax);
   return entry;
 }
 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
   assert(!pass_oop || message == NULL, "either oop or message but not both");
   address entry = __ pc();
   if (pass_oop) {
     // object is at TOS
     __ pop(rbx);
   }
   // expression stack must be empty before entering the VM if an exception happened
   __ empty_expression_stack();
   __ empty_FPU_stack();
   // setup parameters
   __ lea(rax, ExternalAddress((address)name));
   if (pass_oop) {
     __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception), rax, rbx);
   } else {
     if (message != NULL) {
       __ lea(rbx, ExternalAddress((address)message));
     } else {
       __ movptr(rbx, NULL_WORD);
     }
     __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), rax, rbx);
   }
   // throw exception
   __ jump(ExternalAddress(Interpreter::throw_exception_entry()));
   return entry;
 }
 address TemplateInterpreterGenerator::generate_continuation_for(TosState state) {
   address entry = __ pc();
   // NULL last_sp until next java call
   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
   __ dispatch_next(state);
   return entry;
 }
 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step) {
   Label interpreter_entry;
   address compiled_entry = __ pc();
 #ifdef COMPILER2
   // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
   if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
     for (int i = 1; i < 8; i++) {
         __ ffree(i);
     }
   } else if (UseSSE < 2) {
     __ empty_FPU_stack();
   }
 #endif
   if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
     __ MacroAssembler::verify_FPU(1, "generate_return_entry_for compiled");
   } else {
     __ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled");
   }
   __ jmp(interpreter_entry, relocInfo::none);
   // emit a sentinel we can test for when converting an interpreter
   // entry point to a compiled entry point.
   __ a_long(Interpreter::return_sentinel);
   __ a_long((int)compiled_entry);
   address entry = __ pc();
   __ bind(interpreter_entry);
   // In SSE mode, interpreter returns FP results in xmm0 but they need
   // to end up back on the FPU so it can operate on them.
   if (state == ftos && UseSSE >= 1) {
     __ subptr(rsp, wordSize);
     __ movflt(Address(rsp, 0), xmm0);
     __ fld_s(Address(rsp, 0));
     __ addptr(rsp, wordSize);
   } else if (state == dtos && UseSSE >= 2) {
     __ subptr(rsp, 2*wordSize);
     __ movdbl(Address(rsp, 0), xmm0);
     __ fld_d(Address(rsp, 0));
     __ addptr(rsp, 2*wordSize);
   }
   __ MacroAssembler::verify_FPU(state == ftos || state == dtos ? 1 : 0, "generate_return_entry_for in interpreter");
   // Restore stack bottom in case i2c adjusted stack
   __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
   // and NULL it as marker that rsp is now tos until next java call
   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
   __ restore_bcp();
   __ restore_locals();
   __ get_cache_and_index_at_bcp(rbx, rcx, 1);
   __ movl(rbx, Address(rbx, rcx,
                     Address::times_ptr, constantPoolCacheOopDesc::base_offset() +
                     ConstantPoolCacheEntry::flags_offset()));
   __ andptr(rbx, 0xFF);
   __ lea(rsp, Address(rsp, rbx, Interpreter::stackElementScale()));
   __ dispatch_next(state, step);
   return entry;
 }
 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step) {
   address entry = __ pc();
   // In SSE mode, FP results are in xmm0
   if (state == ftos && UseSSE > 0) {
     __ subptr(rsp, wordSize);
     __ movflt(Address(rsp, 0), xmm0);
     __ fld_s(Address(rsp, 0));
     __ addptr(rsp, wordSize);
   } else if (state == dtos && UseSSE >= 2) {
     __ subptr(rsp, 2*wordSize);
     __ movdbl(Address(rsp, 0), xmm0);
     __ fld_d(Address(rsp, 0));
     __ addptr(rsp, 2*wordSize);
   }
   __ MacroAssembler::verify_FPU(state == ftos || state == dtos ? 1 : 0, "generate_deopt_entry_for in interpreter");
   // The stack is not extended by deopt but we must NULL last_sp as this
   // entry is like a "return".
   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
   __ restore_bcp();
   __ restore_locals();
   // handle exceptions
   { Label L;
     const Register thread = rcx;
     __ get_thread(thread);
     __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);
     __ jcc(Assembler::zero, L);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception));
     __ should_not_reach_here();
     __ bind(L);
   }
   __ dispatch_next(state, step);
   return entry;
 }
 int AbstractInterpreter::BasicType_as_index(BasicType type) {
   int i = 0;
   switch (type) {
     case T_BOOLEAN: i = 0; break;
     case T_CHAR   : i = 1; break;
     case T_BYTE   : i = 2; break;
     case T_SHORT  : i = 3; break;
     case T_INT    : // fall through
     case T_LONG   : // fall through
     case T_VOID   : i = 4; break;
     case T_FLOAT  : i = 5; break;  // have to treat float and double separately for SSE
     case T_DOUBLE : i = 6; break;
     case T_OBJECT : // fall through
     case T_ARRAY  : i = 7; break;
     default       : ShouldNotReachHere();
   }
   assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds");
   return i;
 }
 address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) {
   address entry = __ pc();
   switch (type) {
     case T_BOOLEAN: __ c2bool(rax);            break;
     case T_CHAR   : __ andptr(rax, 0xFFFF);    break;
     case T_BYTE   : __ sign_extend_byte (rax); break;
     case T_SHORT  : __ sign_extend_short(rax); break;
     case T_INT    : /* nothing to do */        break;
     case T_DOUBLE :
     case T_FLOAT  :
       { const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
         __ pop(t);                            // remove return address first
         __ pop_dtos_to_rsp();
         // Must return a result for interpreter or compiler. In SSE
         // mode, results are returned in xmm0 and the FPU stack must
         // be empty.
         if (type == T_FLOAT && UseSSE >= 1) {
           // Load ST0
           __ fld_d(Address(rsp, 0));
           // Store as float and empty fpu stack
           __ fstp_s(Address(rsp, 0));
           // and reload
           __ movflt(xmm0, Address(rsp, 0));
         } else if (type == T_DOUBLE && UseSSE >= 2 ) {
           __ movdbl(xmm0, Address(rsp, 0));
         } else {
           // restore ST0
           __ fld_d(Address(rsp, 0));
         }
         // and pop the temp
         __ addptr(rsp, 2 * wordSize);
         __ push(t);                           // restore return address
       }
       break;
     case T_OBJECT :
       // retrieve result from frame
       __ movptr(rax, Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize));
       // and verify it
       __ verify_oop(rax);
       break;
     default       : ShouldNotReachHere();
   }
   __ ret(0);                                   // return from result handler
   return entry;
 }
 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
 //
 // rbx,: method
 // rcx: invocation counter
 //
 void InterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
   const Address invocation_counter(rbx, methodOopDesc::invocation_counter_offset() + InvocationCounter::counter_offset());
   const Address backedge_counter  (rbx, methodOopDesc::backedge_counter_offset() + InvocationCounter::counter_offset());
   if (ProfileInterpreter) { // %%% Merge this into methodDataOop
     __ incrementl(Address(rbx,methodOopDesc::interpreter_invocation_counter_offset()));
   }
   // Update standard invocation counters
   __ movl(rax, backedge_counter);               // load backedge counter
   __ incrementl(rcx, InvocationCounter::count_increment);
   __ andl(rax, InvocationCounter::count_mask_value);  // mask out the status bits
   __ movl(invocation_counter, rcx);             // save invocation count
   __ addl(rcx, rax);                            // add both counters
   // profile_method is non-null only for interpreted method so
   // profile_method != NULL == !native_call
   // BytecodeInterpreter only calls for native so code is elided.
   if (ProfileInterpreter && profile_method != NULL) {
     // Test to see if we should create a method data oop
     __ cmp32(rcx,
              ExternalAddress((address)&InvocationCounter::InterpreterProfileLimit));
     __ jcc(Assembler::less, *profile_method_continue);
     // if no method data exists, go to profile_method
     __ test_method_data_pointer(rax, *profile_method);
   }
   __ cmp32(rcx,
            ExternalAddress((address)&InvocationCounter::InterpreterInvocationLimit));
   __ jcc(Assembler::aboveEqual, *overflow);
 }
 void InterpreterGenerator::generate_counter_overflow(Label* do_continue) {
   // Asm interpreter on entry
   // rdi - locals
   // rsi - bcp
   // rbx, - method
   // rdx - cpool
   // rbp, - interpreter frame
   // C++ interpreter on entry
   // rsi - new interpreter state pointer
   // rbp - interpreter frame pointer
   // rbx - method
   // On return (i.e. jump to entry_point) [ back to invocation of interpreter ]
   // rbx, - method
   // rcx - rcvr (assuming there is one)
   // top of stack return address of interpreter caller
   // rsp - sender_sp
   // C++ interpreter only
   // rsi - previous interpreter state pointer
   const Address size_of_parameters(rbx, methodOopDesc::size_of_parameters_offset());
   // InterpreterRuntime::frequency_counter_overflow takes one argument
   // indicating if the counter overflow occurs at a backwards branch (non-NULL bcp).
   // 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).
   __ movptr(rax, (intptr_t)false);
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), rax);
   __ movptr(rbx, Address(rbp, method_offset));   // restore methodOop
   // Preserve invariant that rsi/rdi contain bcp/locals of sender frame
   // and jump to the interpreted entry.
   __ jmp(*do_continue, relocInfo::none);
 }
 void InterpreterGenerator::generate_stack_overflow_check(void) {
   // see if we've got enough room on the stack for locals plus overhead.
   // the expression stack grows down incrementally, so the normal guard
   // page mechanism will work for that.
   //
   // Registers live on entry:
   //
   // Asm interpreter
   // rdx: number of additional locals this frame needs (what we must check)
   // rbx,: methodOop
   // destroyed on exit
   // rax,
   // NOTE:  since the additional locals are also always pushed (wasn't obvious in
   // generate_method_entry) so the guard should work for them too.
   //
   // monitor entry size: see picture of stack set (generate_method_entry) and frame_x86.hpp
   const int entry_size    = frame::interpreter_frame_monitor_size() * wordSize;
   // total overhead size: entry_size + (saved rbp, thru expr stack bottom).
   // be sure to change this if you add/subtract anything to/from the overhead area
   const int overhead_size = -(frame::interpreter_frame_initial_sp_offset*wordSize) + entry_size;
   const int page_size = os::vm_page_size();
   Label after_frame_check;
   // see if the frame is greater than one page in size. If so,
   // then we need to verify there is enough stack space remaining
   // for the additional locals.
   __ cmpl(rdx, (page_size - overhead_size)/Interpreter::stackElementSize());
   __ jcc(Assembler::belowEqual, after_frame_check);
   // compute rsp as if this were going to be the last frame on
   // the stack before the red zone
   Label after_frame_check_pop;
   __ push(rsi);
   const Register thread = rsi;
   __ get_thread(thread);
   const Address stack_base(thread, Thread::stack_base_offset());
   const Address stack_size(thread, Thread::stack_size_offset());
   // locals + overhead, in bytes
   __ lea(rax, Address(noreg, rdx, Interpreter::stackElementScale(), overhead_size));
 #ifdef ASSERT
   Label stack_base_okay, stack_size_okay;
   // verify that thread stack base is non-zero
   __ cmpptr(stack_base, (int32_t)NULL_WORD);
   __ jcc(Assembler::notEqual, stack_base_okay);
   __ stop("stack base is zero");
   __ bind(stack_base_okay);
   // verify that thread stack size is non-zero
   __ cmpptr(stack_size, 0);
   __ jcc(Assembler::notEqual, stack_size_okay);
   __ stop("stack size is zero");
   __ bind(stack_size_okay);
 #endif
   // Add stack base to locals and subtract stack size
   __ addptr(rax, stack_base);
   __ subptr(rax, stack_size);
   // Use the maximum number of pages we might bang.
   const int max_pages = StackShadowPages > (StackRedPages+StackYellowPages) ? StackShadowPages :
                                                                               (StackRedPages+StackYellowPages);
   __ addptr(rax, max_pages * page_size);
   // check against the current stack bottom
   __ cmpptr(rsp, rax);
   __ jcc(Assembler::above, after_frame_check_pop);
   __ pop(rsi);  // get saved bcp / (c++ prev state ).
   __ pop(rax);  // get return address
   __ jump(ExternalAddress(Interpreter::throw_StackOverflowError_entry()));
   // all done with frame size check
   __ bind(after_frame_check_pop);
   __ pop(rsi);
   __ bind(after_frame_check);
 }
 // Allocate monitor and lock method (asm interpreter)
 // rbx, - methodOop
 //
 void InterpreterGenerator::lock_method(void) {
   // synchronize method
   const Address access_flags      (rbx, methodOopDesc::access_flags_offset());
   const Address monitor_block_top (rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
   const int entry_size            = frame::interpreter_frame_monitor_size() * wordSize;
   #ifdef ASSERT
     { Label L;
       __ movl(rax, access_flags);
       __ testl(rax, JVM_ACC_SYNCHRONIZED);
       __ jcc(Assembler::notZero, L);
       __ stop("method doesn't need synchronization");
       __ bind(L);
     }
   #endif // ASSERT
   // get synchronization object
   { Label done;
     const int mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();
     __ movl(rax, access_flags);
     __ testl(rax, JVM_ACC_STATIC);
     __ movptr(rax, Address(rdi, Interpreter::local_offset_in_bytes(0)));  // get receiver (assume this is frequent case)
     __ jcc(Assembler::zero, done);
     __ movptr(rax, Address(rbx, methodOopDesc::constants_offset()));
     __ movptr(rax, Address(rax, constantPoolOopDesc::pool_holder_offset_in_bytes()));
     __ movptr(rax, Address(rax, mirror_offset));
     __ bind(done);
   }
   // add space for monitor & lock
   __ subptr(rsp, entry_size);                                           // add space for a monitor entry
   __ movptr(monitor_block_top, rsp);                                    // set new monitor block top
   __ movptr(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax); // store object
   __ mov(rdx, rsp);                                                    // object address
   __ lock_object(rdx);
 }
 //
 // Generate a fixed interpreter frame. This is identical setup for interpreted methods
 // and for native methods hence the shared code.
 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
   // initialize fixed part of activation frame
   __ push(rax);                                       // save return address
   __ enter();                                         // save old & set new rbp,
   __ push(rsi);                                       // set sender sp
   __ push((int32_t)NULL_WORD);                        // leave last_sp as null
   __ movptr(rsi, Address(rbx,methodOopDesc::const_offset())); // get constMethodOop
   __ lea(rsi, Address(rsi,constMethodOopDesc::codes_offset())); // get codebase
   __ push(rbx);                                      // save methodOop
   if (ProfileInterpreter) {
     Label method_data_continue;
     __ movptr(rdx, Address(rbx, in_bytes(methodOopDesc::method_data_offset())));
     __ testptr(rdx, rdx);
     __ jcc(Assembler::zero, method_data_continue);
     __ addptr(rdx, in_bytes(methodDataOopDesc::data_offset()));
     __ bind(method_data_continue);
     __ push(rdx);                                       // set the mdp (method data pointer)
   } else {
     __ push(0);
   }
   __ movptr(rdx, Address(rbx, methodOopDesc::constants_offset()));
   __ movptr(rdx, Address(rdx, constantPoolOopDesc::cache_offset_in_bytes()));
   __ push(rdx);                                       // set constant pool cache
   __ push(rdi);                                       // set locals pointer
   if (native_call) {
     __ push(0);                                       // no bcp
   } else {
     __ push(rsi);                                     // set bcp
     }
   __ push(0);                                         // reserve word for pointer to expression stack bottom
   __ movptr(Address(rsp, 0), rsp);                    // set expression stack bottom
 }
 // End of helpers
 //
 // Various method entries
 //------------------------------------------------------------------------------------------------------------------------
 //
 //
 // Call an accessor method (assuming it is resolved, otherwise drop into vanilla (slow path) entry
 address InterpreterGenerator::generate_accessor_entry(void) {
   // rbx,: methodOop
   // rcx: receiver (preserve for slow entry into asm interpreter)
   // rsi: senderSP must preserved for slow path, set SP to it on fast path
   address entry_point = __ pc();
   Label xreturn_path;
   // do fastpath for resolved accessor methods
   if (UseFastAccessorMethods) {
     Label slow_path;
     // If we need a safepoint check, generate full interpreter entry.
     ExternalAddress state(SafepointSynchronize::address_of_state());
     __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),
              SafepointSynchronize::_not_synchronized);
     __ jcc(Assembler::notEqual, slow_path);
     // ASM/C++ Interpreter
     // Code: _aload_0, _(i|a)getfield, _(i|a)return or any rewrites thereof; parameter size = 1
     // Note: We can only use this code if the getfield has been resolved
     //       and if we don't have a null-pointer exception => check for
     //       these conditions first and use slow path if necessary.
     // rbx,: method
     // rcx: receiver
     __ movptr(rax, Address(rsp, wordSize));
     // check if local 0 != NULL and read field
     __ testptr(rax, rax);
     __ jcc(Assembler::zero, slow_path);
     __ movptr(rdi, Address(rbx, methodOopDesc::constants_offset()));
     // read first instruction word and extract bytecode @ 1 and index @ 2
     __ movptr(rdx, Address(rbx, methodOopDesc::const_offset()));
     __ movl(rdx, Address(rdx, constMethodOopDesc::codes_offset()));
     // Shift codes right to get the index on the right.
     // The bytecode fetched looks like <index><0xb4><0x2a>
     __ shrl(rdx, 2*BitsPerByte);
     __ shll(rdx, exact_log2(in_words(ConstantPoolCacheEntry::size())));
     __ movptr(rdi, Address(rdi, constantPoolOopDesc::cache_offset_in_bytes()));
     // rax,: local 0
     // rbx,: method
     // rcx: receiver - do not destroy since it is needed for slow path!
     // rcx: scratch
     // rdx: constant pool cache index
     // rdi: constant pool cache
     // rsi: sender sp
     // check if getfield has been resolved and read constant pool cache entry
     // check the validity of the cache entry by testing whether _indices field
     // contains Bytecode::_getfield in b1 byte.
     assert(in_words(ConstantPoolCacheEntry::size()) == 4, "adjust shift below");
     __ movl(rcx,
             Address(rdi,
                     rdx,
                     Address::times_ptr, constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::indices_offset()));
     __ shrl(rcx, 2*BitsPerByte);
     __ andl(rcx, 0xFF);
     __ cmpl(rcx, Bytecodes::_getfield);
     __ jcc(Assembler::notEqual, slow_path);
     // Note: constant pool entry is not valid before bytecode is resolved
     __ movptr(rcx,
               Address(rdi,
                       rdx,
                       Address::times_ptr, constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::f2_offset()));
     __ movl(rdx,
             Address(rdi,
                     rdx,
                     Address::times_ptr, constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::flags_offset()));
     Label notByte, notShort, notChar;
     const Address field_address (rax, rcx, Address::times_1);
     // Need to differentiate between igetfield, agetfield, bgetfield etc.
     // because they are different sizes.
     // Use the type from the constant pool cache
     __ shrl(rdx, ConstantPoolCacheEntry::tosBits);
     // Make sure we don't need to mask rdx for tosBits after the above shift
     ConstantPoolCacheEntry::verify_tosBits();
     __ cmpl(rdx, btos);
     __ jcc(Assembler::notEqual, notByte);
     __ load_signed_byte(rax, field_address);
     __ jmp(xreturn_path);
     __ bind(notByte);
     __ cmpl(rdx, stos);
     __ jcc(Assembler::notEqual, notShort);
     __ load_signed_short(rax, field_address);
     __ jmp(xreturn_path);
     __ bind(notShort);
     __ cmpl(rdx, ctos);
     __ jcc(Assembler::notEqual, notChar);
     __ load_unsigned_short(rax, field_address);
     __ jmp(xreturn_path);
     __ bind(notChar);
 #ifdef ASSERT
     Label okay;
     __ cmpl(rdx, atos);
     __ jcc(Assembler::equal, okay);
     __ cmpl(rdx, itos);
     __ jcc(Assembler::equal, okay);
     __ stop("what type is this?");
     __ bind(okay);
 #endif // ASSERT
     // All the rest are a 32 bit wordsize
     // This is ok for now. Since fast accessors should be going away
     __ movptr(rax, field_address);
     __ bind(xreturn_path);
     // _ireturn/_areturn
     __ pop(rdi);                               // get return address
     __ mov(rsp, rsi);                          // set sp to sender sp
     __ jmp(rdi);
     // generate a vanilla interpreter entry as the slow path
     __ bind(slow_path);
     (void) generate_normal_entry(false);
     return entry_point;
   }
   return NULL;
 }
 //
 // 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.
 //
 address InterpreterGenerator::generate_native_entry(bool synchronized) {
   // determine code generation flags
   bool inc_counter  = UseCompiler || CountCompiledCalls;
   // rbx,: methodOop
   // rsi: sender sp
   // rsi: previous interpreter state (C++ interpreter) must preserve
   address entry_point = __ pc();
   const Address size_of_parameters(rbx, methodOopDesc::size_of_parameters_offset());
   const Address invocation_counter(rbx, methodOopDesc::invocation_counter_offset() + InvocationCounter::counter_offset());
   const Address access_flags      (rbx, methodOopDesc::access_flags_offset());
   // get parameter size (always needed)
   __ load_unsigned_short(rcx, size_of_parameters);
   // native calls don't need the stack size check since they have no expression stack
   // and the arguments are already on the stack and we only add a handful of words
   // to the stack
   // rbx,: methodOop
   // rcx: size of parameters
   // rsi: sender sp
   __ pop(rax);                                       // get return address
   // for natives the size of locals is zero
   // compute beginning of parameters (rdi)
   __ lea(rdi, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
   // add 2 zero-initialized slots for native calls
   // NULL result handler
   __ push((int32_t)NULL_WORD);
   // NULL oop temp (mirror or jni oop result)
   __ push((int32_t)NULL_WORD);
   if (inc_counter) __ movl(rcx, invocation_counter);  // (pre-)fetch invocation count
   // initialize fixed part of activation frame
   generate_fixed_frame(true);
   // make sure method is native & not abstract
 #ifdef ASSERT
   __ movl(rax, access_flags);
   {
     Label L;
     __ testl(rax, JVM_ACC_NATIVE);
     __ jcc(Assembler::notZero, L);
     __ stop("tried to execute non-native method as native");
     __ bind(L);
   }
   { Label L;
     __ testl(rax, JVM_ACC_ABSTRACT);
     __ jcc(Assembler::zero, L);
     __ stop("tried to execute abstract method in interpreter");
     __ bind(L);
   }
 #endif
   // 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. The remove_activation will
   // check this flag.
   __ get_thread(rax);
   const Address do_not_unlock_if_synchronized(rax,
         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
   __ movbool(do_not_unlock_if_synchronized, true);
   // increment invocation count & check for overflow
   Label invocation_counter_overflow;
   if (inc_counter) {
     generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
   }
   Label continue_after_compile;
   __ bind(continue_after_compile);
   bang_stack_shadow_pages(true);
   // reset the _do_not_unlock_if_synchronized flag
   __ get_thread(rax);
   __ movbool(do_not_unlock_if_synchronized, false);
   // check for synchronized methods
   // Must happen AFTER invocation_counter check and stack overflow check,
   // so method is not locked if overflows.
   //
   if (synchronized) {
     lock_method();
   } else {
     // no synchronization necessary
 #ifdef ASSERT
       { Label L;
         __ movl(rax, access_flags);
         __ testl(rax, JVM_ACC_SYNCHRONIZED);
         __ jcc(Assembler::zero, L);
         __ stop("method needs synchronization");
         __ bind(L);
       }
 #endif
   }
   // start execution
 #ifdef ASSERT
   { Label L;
     const Address monitor_block_top (rbp,
                  frame::interpreter_frame_monitor_block_top_offset * wordSize);
     __ movptr(rax, monitor_block_top);
     __ cmpptr(rax, rsp);
     __ jcc(Assembler::equal, L);
     __ stop("broken stack frame setup in interpreter");
     __ bind(L);
   }
 #endif
   // jvmti/dtrace support
   __ notify_method_entry();
   // work registers
   const Register method = rbx;
   const Register thread = rdi;
   const Register t      = rcx;
   // allocate space for parameters
   __ get_method(method);
   __ verify_oop(method);
   __ load_unsigned_short(t, Address(method, methodOopDesc::size_of_parameters_offset()));
   __ shlptr(t, Interpreter::logStackElementSize());
   __ addptr(t, 2*wordSize);     // allocate two more slots for JNIEnv and possible mirror
   __ subptr(rsp, t);
   __ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics
   // get signature handler
   { Label L;
     __ movptr(t, Address(method, methodOopDesc::signature_handler_offset()));
     __ testptr(t, t);
     __ jcc(Assembler::notZero, L);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method);
     __ get_method(method);
     __ movptr(t, Address(method, methodOopDesc::signature_handler_offset()));
     __ bind(L);
   }
   // call signature handler
   assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rdi, "adjust this code");
   assert(InterpreterRuntime::SignatureHandlerGenerator::to  () == rsp, "adjust this code");
   assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == t  , "adjust this code");
   // The generated handlers do not touch RBX (the method oop).
   // However, large signatures cannot be cached and are generated
   // each time here.  The slow-path generator will blow RBX
   // sometime, so we must reload it after the call.
   __ call(t);
   __ get_method(method);        // slow path call blows RBX on DevStudio 5.0
   // result handler is in rax,
   // set result handler
   __ movptr(Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize), rax);
   // pass mirror handle if static call
   { Label L;
     const int mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();
     __ movl(t, Address(method, methodOopDesc::access_flags_offset()));
     __ testl(t, JVM_ACC_STATIC);
     __ jcc(Assembler::zero, L);
     // get mirror
     __ movptr(t, Address(method, methodOopDesc:: constants_offset()));
     __ movptr(t, Address(t, constantPoolOopDesc::pool_holder_offset_in_bytes()));
     __ movptr(t, Address(t, mirror_offset));
     // copy mirror into activation frame
     __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize), t);
     // pass handle to mirror
     __ lea(t, Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));
     __ movptr(Address(rsp, wordSize), t);
     __ bind(L);
   }
   // get native function entry point
   { Label L;
     __ movptr(rax, Address(method, methodOopDesc::native_function_offset()));
     ExternalAddress unsatisfied(SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
     __ cmpptr(rax, unsatisfied.addr());
     __ jcc(Assembler::notEqual, L);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method);
     __ get_method(method);
     __ verify_oop(method);
     __ movptr(rax, Address(method, methodOopDesc::native_function_offset()));
     __ bind(L);
   }
   // pass JNIEnv
   __ get_thread(thread);
   __ lea(t, Address(thread, JavaThread::jni_environment_offset()));
   __ movptr(Address(rsp, 0), t);
   // set_last_Java_frame_before_call
   // It is enough that the pc()
   // points into the right code segment. It does not have to be the correct return pc.
   __ set_last_Java_frame(thread, noreg, rbp, __ pc());
   // change thread state
 #ifdef ASSERT
   { Label L;
     __ movl(t, Address(thread, JavaThread::thread_state_offset()));
     __ cmpl(t, _thread_in_Java);
     __ jcc(Assembler::equal, L);
     __ stop("Wrong thread state in native stub");
     __ bind(L);
   }
 #endif
   // Change state to native
   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native);
   __ call(rax);
   // result potentially in rdx:rax or ST0
   // Either restore the MXCSR register after returning from the JNI Call
   // or verify that it wasn't changed.
   if (VM_Version::supports_sse()) {
     if (RestoreMXCSROnJNICalls) {
       __ ldmxcsr(ExternalAddress(StubRoutines::addr_mxcsr_std()));
     }
     else if (CheckJNICalls ) {
       __ call(RuntimeAddress(StubRoutines::x86::verify_mxcsr_entry()));
     }
   }
   // Either restore the x87 floating pointer control word after returning
   // from the JNI call or verify that it wasn't changed.
   if (CheckJNICalls) {
     __ call(RuntimeAddress(StubRoutines::x86::verify_fpu_cntrl_wrd_entry()));
   }
   // save potential result in ST(0) & rdx:rax
   // (if result handler is the T_FLOAT or T_DOUBLE handler, result must be in ST0 -
   // the check is necessary to avoid potential Intel FPU overflow problems by saving/restoring 'empty' FPU registers)
   // It is safe to do this push because state is _thread_in_native and return address will be found
   // via _last_native_pc and not via _last_jave_sp
   // NOTE: the order of theses push(es) is known to frame::interpreter_frame_result.
   // If the order changes or anything else is added to the stack the code in
   // interpreter_frame_result will have to be changed.
   { Label L;
     Label push_double;
     ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT));
     ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE));
     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
               float_handler.addr());
     __ jcc(Assembler::equal, push_double);
     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
               double_handler.addr());
     __ jcc(Assembler::notEqual, L);
     __ bind(push_double);
     __ push(dtos);
     __ bind(L);
   }
   __ push(ltos);
   // change thread state
   __ get_thread(thread);
   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native_trans);
   if(os::is_MP()) {
     if (UseMembar) {
       // Force this write out before the read below
       __ membar(Assembler::Membar_mask_bits(
            Assembler::LoadLoad | Assembler::LoadStore |
            Assembler::StoreLoad | Assembler::StoreStore));
     } else {
       // Write serialization page so 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.
       __ serialize_memory(thread, rcx);
     }
   }
   if (AlwaysRestoreFPU) {
     //  Make sure the control word is correct.
     __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std()));
   }
   // check for safepoint operation in progress and/or pending suspend requests
   { Label Continue;
     __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),
              SafepointSynchronize::_not_synchronized);
     Label L;
     __ jcc(Assembler::notEqual, L);
     __ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0);
     __ jcc(Assembler::equal, Continue);
     __ bind(L);
     // Don't use call_VM as it will see a possible pending exception and forward it
     // and never return here preventing us from clearing _last_native_pc down below.
     // Also can't use call_VM_leaf either as it will check to see if rsi & rdi are
     // preserved and correspond to the bcp/locals pointers. So we do a runtime call
     // by hand.
     //
     __ push(thread);
     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address,
                                             JavaThread::check_special_condition_for_native_trans)));
     __ increment(rsp, wordSize);
     __ get_thread(thread);
     __ bind(Continue);
   }
   // change thread state
   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_Java);
   __ reset_last_Java_frame(thread, true, true);
   // reset handle block
   __ movptr(t, Address(thread, JavaThread::active_handles_offset()));
   __ movptr(Address(t, JNIHandleBlock::top_offset_in_bytes()), NULL_WORD);
   // If result was an oop then unbox and save it in the frame
   { Label L;
     Label no_oop, store_result;
     ExternalAddress handler(AbstractInterpreter::result_handler(T_OBJECT));
     __ cmpptr(Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize),
               handler.addr());
     __ jcc(Assembler::notEqual, no_oop);
     __ cmpptr(Address(rsp, 0), (int32_t)NULL_WORD);
     __ pop(ltos);
     __ testptr(rax, rax);
     __ jcc(Assembler::zero, store_result);
     // unbox
     __ movptr(rax, Address(rax, 0));
     __ bind(store_result);
     __ movptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset)*wordSize), rax);
     // keep stack depth as expected by pushing oop which will eventually be discarded
     __ push(ltos);
     __ bind(no_oop);
   }
   {
      Label no_reguard;
      __ cmpl(Address(thread, JavaThread::stack_guard_state_offset()), JavaThread::stack_guard_yellow_disabled);
      __ jcc(Assembler::notEqual, no_reguard);
      __ pusha();
      __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
      __ popa();
      __ bind(no_reguard);
    }
   // restore rsi to have legal interpreter frame,
   // i.e., bci == 0 <=> rsi == code_base()
   // Can't call_VM until bcp is within reasonable.
   __ get_method(method);      // method is junk from thread_in_native to now.
   __ verify_oop(method);
   __ movptr(rsi, Address(method,methodOopDesc::const_offset()));   // get constMethodOop
   __ lea(rsi, Address(rsi,constMethodOopDesc::codes_offset()));    // get codebase
   // handle exceptions (exception handling will handle unlocking!)
   { Label L;
     __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);
     __ jcc(Assembler::zero, L);
     // Note: At some point we may want to unify this with the code used in call_VM_base();
     //       i.e., we should use the StubRoutines::forward_exception code. For now this
     //       doesn't work here because the rsp is not correctly set at this point.
     __ MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception));
     __ should_not_reach_here();
     __ bind(L);
   }
   // do unlocking if necessary
   { Label L;
     __ movl(t, Address(method, methodOopDesc::access_flags_offset()));
     __ testl(t, JVM_ACC_SYNCHRONIZED);
     __ jcc(Assembler::zero, L);
     // the code below should be shared with interpreter macro assembler implementation
     { Label unlock;
       // BasicObjectLock will be first in list, since this is a synchronized method. However, need
       // to check that the object has not been unlocked by an explicit monitorexit bytecode.
       const Address monitor(rbp, frame::interpreter_frame_initial_sp_offset * wordSize - (int)sizeof(BasicObjectLock));
       __ lea(rdx, monitor);                   // address of first monitor
       __ movptr(t, Address(rdx, BasicObjectLock::obj_offset_in_bytes()));
       __ testptr(t, t);
       __ jcc(Assembler::notZero, unlock);
       // Entry already unlocked, need to throw exception
       __ MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));
       __ should_not_reach_here();
       __ bind(unlock);
       __ unlock_object(rdx);
     }
     __ bind(L);
   }
   // jvmti/dtrace support
   // Note: This must happen _after_ handling/throwing any exceptions since
   //       the exception handler code notifies the runtime of method exits
   //       too. If this happens before, method entry/exit notifications are
   //       not properly paired (was bug - gri 11/22/99).
   __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI);
   // restore potential result in rdx:rax, call result handler to restore potential result in ST0 & handle result
   __ pop(ltos);
   __ movptr(t, Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize));
   __ call(t);
   // remove activation
   __ movptr(t, Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp
   __ leave();                                // remove frame anchor
   __ pop(rdi);                               // get return address
   __ mov(rsp, t);                            // set sp to sender sp
   __ jmp(rdi);
   if (inc_counter) {
     // Handle overflow of counter and compile method
     __ bind(invocation_counter_overflow);
     generate_counter_overflow(&continue_after_compile);
   }
   return entry_point;
 }
 //
 // Generic interpreted method entry to (asm) interpreter
 //
 address InterpreterGenerator::generate_normal_entry(bool synchronized) {
   // determine code generation flags
   bool inc_counter  = UseCompiler || CountCompiledCalls;
   // rbx,: methodOop
   // rsi: sender sp
   address entry_point = __ pc();
   const Address size_of_parameters(rbx, methodOopDesc::size_of_parameters_offset());
   const Address size_of_locals    (rbx, methodOopDesc::size_of_locals_offset());
   const Address invocation_counter(rbx, methodOopDesc::invocation_counter_offset() + InvocationCounter::counter_offset());
   const Address access_flags      (rbx, methodOopDesc::access_flags_offset());
   // get parameter size (always needed)
   __ load_unsigned_short(rcx, size_of_parameters);
   // rbx,: methodOop
   // rcx: size of parameters
   // rsi: sender_sp (could differ from sp+wordSize if we were called via c2i )
   __ load_unsigned_short(rdx, size_of_locals);       // get size of locals in words
   __ subl(rdx, rcx);                                // rdx = no. of additional locals
   // see if we've got enough room on the stack for locals plus overhead.
   generate_stack_overflow_check();
   // get return address
   __ pop(rax);
   // compute beginning of parameters (rdi)
   __ lea(rdi, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
   // rdx - # of additional locals
   // allocate space for locals
   // explicitly initialize locals
   {
     Label exit, loop;
     __ testl(rdx, rdx);
     __ jcc(Assembler::lessEqual, exit);               // do nothing if rdx <= 0
     __ bind(loop);
     if (TaggedStackInterpreter) {
       __ push((int32_t)NULL_WORD);                    // push tag
     }
     __ push((int32_t)NULL_WORD);                      // initialize local variables
     __ decrement(rdx);                                // until everything initialized
     __ jcc(Assembler::greater, loop);
     __ bind(exit);
   }
   if (inc_counter) __ movl(rcx, invocation_counter);  // (pre-)fetch invocation count
   // initialize fixed part of activation frame
   generate_fixed_frame(false);
   // make sure method is not native & not abstract
 #ifdef ASSERT
   __ movl(rax, access_flags);
   {
     Label L;
     __ testl(rax, JVM_ACC_NATIVE);
     __ jcc(Assembler::zero, L);
     __ stop("tried to execute native method as non-native");
     __ bind(L);
   }
   { Label L;
     __ testl(rax, JVM_ACC_ABSTRACT);
     __ jcc(Assembler::zero, L);
     __ stop("tried to execute abstract method in interpreter");
     __ bind(L);
   }
 #endif
   // 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. The remove_activation will
   // check this flag.
   __ get_thread(rax);
   const Address do_not_unlock_if_synchronized(rax,
         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
   __ movbool(do_not_unlock_if_synchronized, true);
   // increment invocation count & check for overflow
   Label invocation_counter_overflow;
   Label profile_method;
   Label profile_method_continue;
   if (inc_counter) {
     generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
     if (ProfileInterpreter) {
       __ bind(profile_method_continue);
     }
   }
   Label continue_after_compile;
   __ bind(continue_after_compile);
   bang_stack_shadow_pages(false);
   // reset the _do_not_unlock_if_synchronized flag
   __ get_thread(rax);
   __ movbool(do_not_unlock_if_synchronized, false);
   // check for synchronized methods
   // Must happen AFTER invocation_counter check and stack overflow check,
   // so method is not locked if overflows.
   //
   if (synchronized) {
     // Allocate monitor and lock method
     lock_method();
   } else {
     // no synchronization necessary
 #ifdef ASSERT
       { Label L;
         __ movl(rax, access_flags);
         __ testl(rax, JVM_ACC_SYNCHRONIZED);
         __ jcc(Assembler::zero, L);
         __ stop("method needs synchronization");
         __ bind(L);
       }
 #endif
   }
   // start execution
 #ifdef ASSERT
   { Label L;
      const Address monitor_block_top (rbp,
                  frame::interpreter_frame_monitor_block_top_offset * wordSize);
     __ movptr(rax, monitor_block_top);
     __ cmpptr(rax, rsp);
     __ jcc(Assembler::equal, L);
     __ stop("broken stack frame setup in interpreter");
     __ bind(L);
   }
 #endif
   // jvmti support
   __ notify_method_entry();
   __ dispatch_next(vtos);
   // invocation counter overflow
   if (inc_counter) {
     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), rsi, true);
       __ movptr(rbx, Address(rbp, method_offset));   // restore methodOop
       __ movptr(rax, Address(rbx, in_bytes(methodOopDesc::method_data_offset())));
       __ movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), rax);
       __ test_method_data_pointer(rax, profile_method_continue);
       __ addptr(rax, in_bytes(methodDataOopDesc::data_offset()));
       __ movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), rax);
       __ jmp(profile_method_continue);
     }
     // Handle overflow of counter and compile method
     __ bind(invocation_counter_overflow);
     generate_counter_overflow(&continue_after_compile);
   }
   return entry_point;
 }
 //------------------------------------------------------------------------------------------------------------------------
 // Entry points
 //
 // Here we generate the various kind of entries into the interpreter.
 // The two main entry type are generic bytecode methods and native call method.
 // These both come in synchronized and non-synchronized versions but the
 // frame layout they create is very similar. The other method entry
 // types are really just special purpose entries that are really entry
 // and interpretation all in one. These are for trivial methods like
 // accessor, empty, or special math methods.
 //
 // When control flow reaches any of the entry types for the interpreter
 // the following holds ->
 //
 // Arguments:
 //
 // rbx,: methodOop
 // rcx: receiver
 //
 //
 // Stack layout immediately at entry
 //
 // [ return address     ] <--- rsp
 // [ parameter n        ]
 //   ...
 // [ parameter 1        ]
 // [ expression stack   ] (caller's java expression stack)
 // Assuming that we don't go to one of the trivial specialized
 // entries the stack will look like below when we are ready to execute
 // the first bytecode (or call the native routine). The register usage
 // will be as the template based interpreter expects (see interpreter_x86.hpp).
 //
 // local variables follow incoming parameters immediately; i.e.
 // the return address is moved to the end of the locals).
 //
 // [ monitor entry      ] <--- rsp
 //   ...
 // [ monitor entry      ]
 // [ expr. stack bottom ]
 // [ saved rsi          ]
 // [ current rdi        ]
 // [ methodOop          ]
 // [ saved rbp,          ] <--- rbp,
 // [ return address     ]
 // [ local variable m   ]
 //   ...
 // [ local variable 1   ]
 // [ parameter n        ]
 //   ...
 // [ parameter 1        ] <--- rdi
 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    : entry_point = ((InterpreterGenerator*)this)->generate_math_entry(kind);     break;
     default                                  : ShouldNotReachHere();                                                       break;
   }
   if (entry_point) return entry_point;
   return ((InterpreterGenerator*)this)->generate_normal_entry(synchronized);
 }
 // How much stack a method activation needs in words.
 int AbstractInterpreter::size_top_interpreter_activation(methodOop method) {
   const int stub_code = 4;  // see generate_call_stub
   // Save space for one monitor to get into the interpreted method in case
   // the method is synchronized
   int monitor_size    = method->is_synchronized() ?
 *frame::interpreter_frame_monitor_size() : 0;
   // total overhead size: entry_size + (saved rbp, thru expr stack bottom).
   // be sure to change this if you add/subtract anything to/from the overhead area
   const int overhead_size = -frame::interpreter_frame_initial_sp_offset;
   const int method_stack = (method->max_locals() + method->max_stack()) *
                            Interpreter::stackElementWords();
   return overhead_size + method_stack + stub_code;
 }
 // asm based interpreter deoptimization helpers
 int AbstractInterpreter::layout_activation(methodOop method,
                                            int tempcount,
                                            int popframe_extra_args,
                                            int moncount,
                                            int callee_param_count,
                                            int callee_locals,
                                            frame* caller,
                                            frame* interpreter_frame,
                                            bool is_top_frame) {
   // Note: This calculation must exactly parallel the frame setup
   // in AbstractInterpreterGenerator::generate_method_entry.
   // If 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
   // NOTE: return size is in words not bytes
   // fixed size of an interpreter frame:
   int max_locals = method->max_locals() * Interpreter::stackElementWords();
   int extra_locals = (method->max_locals() - method->size_of_parameters()) *
                      Interpreter::stackElementWords();
   int overhead = frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset;
   // Our locals were accounted for by the caller (or last_frame_adjust on the transistion)
   // Since the callee parameters already account for the callee's params we only need to account for
   // the extra locals.
   int size = overhead +
          ((callee_locals - callee_param_count)*Interpreter::stackElementWords()) +
          (moncount*frame::interpreter_frame_monitor_size()) +
          tempcount*Interpreter::stackElementWords() + popframe_extra_args;
   if (interpreter_frame != NULL) {
 #ifdef ASSERT
     assert(caller->unextended_sp() == interpreter_frame->interpreter_frame_sender_sp(), "Frame not properly walkable");
     assert(caller->sp() == interpreter_frame->sender_sp(), "Frame not properly walkable(2)");
 #endif
     interpreter_frame->interpreter_frame_set_method(method);
     // NOTE the difference in using sender_sp and interpreter_frame_sender_sp
     // interpreter_frame_sender_sp is the original sp of the caller (the unextended_sp)
     // and sender_sp is fp+8
     intptr_t* locals = interpreter_frame->sender_sp() + max_locals - 1;
     interpreter_frame->interpreter_frame_set_locals(locals);
     BasicObjectLock* montop = interpreter_frame->interpreter_frame_monitor_begin();
     BasicObjectLock* monbot = montop - moncount;
     interpreter_frame->interpreter_frame_set_monitor_end(monbot);
     // Set last_sp
     intptr_t*  rsp = (intptr_t*) monbot  -
                      tempcount*Interpreter::stackElementWords() -
                      popframe_extra_args;
     interpreter_frame->interpreter_frame_set_last_sp(rsp);
     // All frames but the initial (oldest) interpreter frame we fill in have a
     // value for sender_sp that allows walking the stack but isn't
     // truly correct. Correct the value here.
     if (extra_locals != 0 &&
         interpreter_frame->sender_sp() == interpreter_frame->interpreter_frame_sender_sp() ) {
       interpreter_frame->set_interpreter_frame_sender_sp(caller->sp() + extra_locals);
     }
     *interpreter_frame->interpreter_frame_cache_addr() =
       method->constants()->cache();
   }
   return size;
 }
 //------------------------------------------------------------------------------------------------------------------------
 // Exceptions
 void TemplateInterpreterGenerator::generate_throw_exception() {
   // Entry point in previous activation (i.e., if the caller was interpreted)
   Interpreter::_rethrow_exception_entry = __ pc();
   // Restore sp to interpreter_frame_last_sp even though we are going
   // to empty the expression stack for the exception processing.
   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
   // rax,: exception
   // rdx: return address/pc that threw exception
   __ restore_bcp();                              // rsi points to call/send
   __ restore_locals();
   // Entry point for exceptions thrown within interpreter code
   Interpreter::_throw_exception_entry = __ pc();
   // expression stack is undefined here
   // rax,: exception
   // rsi: exception bcp
   __ verify_oop(rax);
   // expression stack must be empty before entering the VM in case of an exception
   __ empty_expression_stack();
   __ empty_FPU_stack();
   // find exception handler address and preserve exception oop
   __ call_VM(rdx, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), rax);
   // rax,: exception handler entry point
   // rdx: preserved exception oop
   // rsi: bcp for exception handler
   __ push_ptr(rdx);                              // push exception which is now the only value on the stack
   __ jmp(rax);                                   // jump to exception handler (may be _remove_activation_entry!)
   // 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
   // rsi: exception bcp
   //
   // JVMTI PopFrame support
   //
    Interpreter::_remove_activation_preserving_args_entry = __ pc();
   __ empty_expression_stack();
   __ empty_FPU_stack();
   // Set the popframe_processing bit in pending_popframe_condition indicating that we are
   // currently handling popframe, so that call_VMs that may happen later do not trigger new
   // popframe handling cycles.
   __ get_thread(rcx);
   __ movl(rdx, Address(rcx, JavaThread::popframe_condition_offset()));
   __ orl(rdx, JavaThread::popframe_processing_bit);
   __ movl(Address(rcx, JavaThread::popframe_condition_offset()), rdx);
   {
     // 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.)
     // 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.
     //
     // 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 caller_not_deoptimized;
     __ movptr(rdx, Address(rbp, frame::return_addr_offset * wordSize));
     __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), rdx);
     __ testl(rax, rax);
     __ jcc(Assembler::notZero, caller_not_deoptimized);
     // Compute size of arguments for saving when returning to deoptimized caller
     __ get_method(rax);
     __ verify_oop(rax);
     __ load_unsigned_short(rax, Address(rax, in_bytes(methodOopDesc::size_of_parameters_offset())));
     __ shlptr(rax, Interpreter::logStackElementSize());
     __ restore_locals();
     __ subptr(rdi, rax);
     __ addptr(rdi, wordSize);
     // Save these arguments
     __ get_thread(rcx);
     __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), rcx, rax, rdi);
     __ remove_activation(vtos, rdx,
                          /* throw_monitor_exception */ false,
                          /* install_monitor_exception */ false,
                          /* notify_jvmdi */ false);
     // Inform deoptimization that it is responsible for restoring these arguments
     __ get_thread(rcx);
     __ movl(Address(rcx, JavaThread::popframe_condition_offset()), JavaThread::popframe_force_deopt_reexecution_bit);
     // Continue in deoptimization handler
     __ jmp(rdx);
     __ bind(caller_not_deoptimized);
   }
   __ remove_activation(vtos, rdx,
                        /* throw_monitor_exception */ false,
                        /* install_monitor_exception */ false,
                        /* notify_jvmdi */ false);
   // Finish with popframe handling
   // A previous I2C followed by a deoptimization might have moved the
   // outgoing arguments further up the stack. PopFrame expects the
   // mutations to those outgoing arguments to be preserved and other
   // constraints basically require this frame to look exactly as
   // though it had previously invoked an interpreted activation with
   // no space between the top of the expression stack (current
   // last_sp) and the top of stack. Rather than force deopt to
   // maintain this kind of invariant all the time we call a small
   // fixup routine to move the mutated arguments onto the top of our
   // expression stack if necessary.
   __ mov(rax, rsp);
   __ movptr(rbx, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
   __ get_thread(rcx);
   // PC must point into interpreter here
   __ set_last_Java_frame(rcx, noreg, rbp, __ pc());
   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), rcx, rax, rbx);
   __ get_thread(rcx);
   __ reset_last_Java_frame(rcx, true, true);
   // Restore the last_sp and null it out
   __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
   __ restore_bcp();
   __ restore_locals();
   // The method data pointer was incremented already during
   // call profiling. We have to restore the mdp for the current bcp.
   if (ProfileInterpreter) {
     __ set_method_data_pointer_for_bcp();
   }
   // Clear the popframe condition flag
   __ get_thread(rcx);
   __ movl(Address(rcx, JavaThread::popframe_condition_offset()), JavaThread::popframe_inactive);
   __ dispatch_next(vtos);
   // end of PopFrame support
   Interpreter::_remove_activation_entry = __ pc();
   // preserve exception over this code sequence
   __ pop_ptr(rax);
   __ get_thread(rcx);
   __ movptr(Address(rcx, JavaThread::vm_result_offset()), rax);
   // remove the activation (without doing throws on illegalMonitorExceptions)
   __ remove_activation(vtos, rdx, false, true, false);
   // restore exception
   __ get_thread(rcx);
   __ movptr(rax, Address(rcx, JavaThread::vm_result_offset()));
   __ movptr(Address(rcx, JavaThread::vm_result_offset()), NULL_WORD);
   __ verify_oop(rax);
   // Inbetween activations - previous activation type unknown yet
   // compute continuation point - the continuation point expects
   // the following registers set up:
   //
   // rax,: exception
   // rdx: return address/pc that threw exception
   // rsp: expression stack of caller
   // rbp,: rbp, of caller
   __ push(rax);                                  // save exception
   __ push(rdx);                                  // save return address
   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rdx);
   __ mov(rbx, rax);                              // save exception handler
   __ pop(rdx);                                   // restore return address
   __ pop(rax);                                   // restore exception
   // Note that an "issuing PC" is actually the next PC after the call
   __ jmp(rbx);                                   // jump to exception handler of caller
 }
 //
 // JVMTI ForceEarlyReturn support
 //
 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
   address entry = __ pc();
   __ restore_bcp();
   __ restore_locals();
   __ empty_expression_stack();
   __ empty_FPU_stack();
   __ load_earlyret_value(state);
   __ get_thread(rcx);
   __ movptr(rcx, Address(rcx, JavaThread::jvmti_thread_state_offset()));
   const Address cond_addr(rcx, JvmtiThreadState::earlyret_state_offset());
   // Clear the earlyret state
   __ movl(cond_addr, JvmtiThreadState::earlyret_inactive);
   __ remove_activation(state, rsi,
                        false, /* throw_monitor_exception */
                        false, /* install_monitor_exception */
                        true); /* notify_jvmdi */
   __ jmp(rsi);
   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;
   fep = __ pc(); __ push(ftos); __ jmp(L);
   dep = __ pc(); __ push(dtos); __ jmp(L);
   lep = __ pc(); __ push(ltos); __ jmp(L);
   aep = __ pc(); __ push(atos); __ jmp(L);
   bep = cep = sep =             // fall through
   iep = __ pc(); __ push(itos); // fall through
   vep = __ pc(); __ bind(L);    // fall through
   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) {
   address entry = __ pc();
   // prepare expression stack
   __ pop(rcx);          // pop return address so expression stack is 'pure'
   __ push(state);       // save tosca
   // pass tosca registers as arguments & call tracer
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::trace_bytecode), rcx, rax, rdx);
   __ mov(rcx, rax);     // make sure return address is not destroyed by pop(state)
   __ pop(state);        // restore tosca
   // return
   __ jmp(rcx);
   return entry;
 }
 void TemplateInterpreterGenerator::count_bytecode() {
   __ incrementl(ExternalAddress((address) &BytecodeCounter::_counter_value));
 }
 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
   __ incrementl(ExternalAddress((address) &BytecodeHistogram::_counters[t->bytecode()]));
 }
 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
   __ mov32(ExternalAddress((address) &BytecodePairHistogram::_index), rbx);
   __ shrl(rbx, BytecodePairHistogram::log2_number_of_codes);
   __ orl(rbx, ((int)t->bytecode()) << BytecodePairHistogram::log2_number_of_codes);
   ExternalAddress table((address) BytecodePairHistogram::_counters);
   Address index(noreg, rbx, Address::times_4);
   __ incrementl(ArrayAddress(table, index));
 }
 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");
   __ call(RuntimeAddress(Interpreter::trace_code(t->tos_in())));
 }
 void TemplateInterpreterGenerator::stop_interpreter_at() {
   Label L;
   __ cmp32(ExternalAddress((address) &BytecodeCounter::_counter_value),
            StopInterpreterAt);
   __ jcc(Assembler::notEqual, L);
   __ int3();
   __ bind(L);
 }
 #endif // !PRODUCT
 #endif // CC_INTERP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/templateInterpreter_x86_32.cpp@56aae7be60d4 (annotated)

src/cpu/x86/vm/templateInterpreter_x86_32.cpp