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

src/cpu/ppc/vm/interpreter_ppc.cpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/interpreter_ppc.cpp

Wed, 27 Nov 2013 16:16:21 -0800

author: goetz
date: Wed, 27 Nov 2013 16:16:21 -0800
changeset 6490: 41b780b43b74
parent 6458: ec28f9c041ff
child 6495: 67fa91961822
permissions: -rw-r--r--

8029015: PPC64 (part 216): opto: trap based null and range checks
Summary: On PPC64 use tdi instruction that does a compare and raises SIGTRAP for NULL and range checks.
Reviewed-by: kvn

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2012, 2013 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"
 #include "asm/assembler.hpp"
 #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 "prims/methodHandles.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"
 #ifdef COMPILER1
 #include "c1/c1_Runtime1.hpp"
 #endif
 #ifndef CC_INTERP
 #error "CC_INTERP must be defined on PPC"
 #endif
 #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 ":")
 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    : i = 4; break;
     case T_LONG   : i = 5; break;
     case T_VOID   : i = 6; break;
     case T_FLOAT  : i = 7; break;
     case T_DOUBLE : i = 8; break;
     case T_OBJECT : i = 9; break;
     case T_ARRAY  : i = 9; break;
     default       : ShouldNotReachHere();
   }
   assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds");
   return i;
 }
 address AbstractInterpreterGenerator::generate_slow_signature_handler() {
   // Slow_signature handler that respects the PPC C calling conventions.
   //
   // We get called by the native entry code with our output register
   // area == 8. First we call InterpreterRuntime::get_result_handler
   // to copy the pointer to the signature string temporarily to the
   // first C-argument and to return the result_handler in
   // R3_RET. Since native_entry will copy the jni-pointer to the
   // first C-argument slot later on, it is OK to occupy this slot
   // temporarilly. Then we copy the argument list on the java
   // expression stack into native varargs format on the native stack
   // and load arguments into argument registers. Integer arguments in
   // the varargs vector will be sign-extended to 8 bytes.
   //
   // On entry:
   //   R3_ARG1        - intptr_t*     Address of java argument list in memory.
   //   R15_prev_state - BytecodeInterpreter* Address of interpreter state for
   //     this method
   //   R19_method
   //
   // On exit (just before return instruction):
   //   R3_RET            - contains the address of the result_handler.
   //   R4_ARG2           - is not updated for static methods and contains "this" otherwise.
   //   R5_ARG3-R10_ARG8: - When the (i-2)th Java argument is not of type float or double,
   //                       ARGi contains this argument. Otherwise, ARGi is not updated.
   //   F1_ARG1-F13_ARG13 - contain the first 13 arguments of type float or double.
   const int LogSizeOfTwoInstructions = 3;
   // FIXME: use Argument:: GL: Argument names different numbers!
   const int max_fp_register_arguments  = 13;
   const int max_int_register_arguments = 6;  // first 2 are reserved
   const Register arg_java       = R21_tmp1;
   const Register arg_c          = R22_tmp2;
   const Register signature      = R23_tmp3;  // is string
   const Register sig_byte       = R24_tmp4;
   const Register fpcnt          = R25_tmp5;
   const Register argcnt         = R26_tmp6;
   const Register intSlot        = R27_tmp7;
   const Register target_sp      = R28_tmp8;
   const FloatRegister floatSlot = F0;
   address entry = __ emit_fd();
   __ save_LR_CR(R0);
   __ save_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14));
   // We use target_sp for storing arguments in the C frame.
   __ mr(target_sp, R1_SP);
   __ push_frame_abi112_nonvolatiles(0, R11_scratch1);
   __ mr(arg_java, R3_ARG1);
   __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_signature), R16_thread, R19_method);
   // Signature is in R3_RET. Signature is callee saved.
   __ mr(signature, R3_RET);
   // Reload method, it may have moved.
 #ifdef CC_INTERP
   __ ld(R19_method, state_(_method));
 #else
   __ unimplemented("slow signature handler 1");
 #endif
   // Get the result handler.
   __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_result_handler), R16_thread, R19_method);
   // Reload method, it may have moved.
 #ifdef CC_INTERP
   __ ld(R19_method, state_(_method));
 #else
   __ unimplemented("slow signature handler 2");
 #endif
   {
     Label L;
     // test if static
     // _access_flags._flags must be at offset 0.
     // TODO PPC port: requires change in shared code.
     //assert(in_bytes(AccessFlags::flags_offset()) == 0,
     //       "MethodOopDesc._access_flags == MethodOopDesc._access_flags._flags");
     // _access_flags must be a 32 bit value.
     assert(sizeof(AccessFlags) == 4, "wrong size");
     __ lwa(R11_scratch1/*access_flags*/, method_(access_flags));
     // testbit with condition register.
     __ testbitdi(CCR0, R0, R11_scratch1/*access_flags*/, JVM_ACC_STATIC_BIT);
     __ btrue(CCR0, L);
     // For non-static functions, pass "this" in R4_ARG2 and copy it
     // to 2nd C-arg slot.
     // We need to box the Java object here, so we use arg_java
     // (address of current Java stack slot) as argument and don't
     // dereference it as in case of ints, floats, etc.
     __ mr(R4_ARG2, arg_java);
     __ addi(arg_java, arg_java, -BytesPerWord);
     __ std(R4_ARG2, _abi(carg_2), target_sp);
     __ bind(L);
   }
   // Will be incremented directly after loop_start. argcnt=0
   // corresponds to 3rd C argument.
   __ li(argcnt, -1);
   // arg_c points to 3rd C argument
   __ addi(arg_c, target_sp, _abi(carg_3));
   // no floating-point args parsed so far
   __ li(fpcnt, 0);
   Label move_intSlot_to_ARG, move_floatSlot_to_FARG;
   Label loop_start, loop_end;
   Label do_int, do_long, do_float, do_double, do_dontreachhere, do_object, do_array, do_boxed;
   // signature points to '(' at entry
 #ifdef ASSERT
   __ lbz(sig_byte, 0, signature);
   __ cmplwi(CCR0, sig_byte, '(');
   __ bne(CCR0, do_dontreachhere);
 #endif
   __ bind(loop_start);
   __ addi(argcnt, argcnt, 1);
   __ lbzu(sig_byte, 1, signature);
   __ cmplwi(CCR0, sig_byte, ')'); // end of signature
   __ beq(CCR0, loop_end);
   __ cmplwi(CCR0, sig_byte, 'B'); // byte
   __ beq(CCR0, do_int);
   __ cmplwi(CCR0, sig_byte, 'C'); // char
   __ beq(CCR0, do_int);
   __ cmplwi(CCR0, sig_byte, 'D'); // double
   __ beq(CCR0, do_double);
   __ cmplwi(CCR0, sig_byte, 'F'); // float
   __ beq(CCR0, do_float);
   __ cmplwi(CCR0, sig_byte, 'I'); // int
   __ beq(CCR0, do_int);
   __ cmplwi(CCR0, sig_byte, 'J'); // long
   __ beq(CCR0, do_long);
   __ cmplwi(CCR0, sig_byte, 'S'); // short
   __ beq(CCR0, do_int);
   __ cmplwi(CCR0, sig_byte, 'Z'); // boolean
   __ beq(CCR0, do_int);
   __ cmplwi(CCR0, sig_byte, 'L'); // object
   __ beq(CCR0, do_object);
   __ cmplwi(CCR0, sig_byte, '['); // array
   __ beq(CCR0, do_array);
   //  __ cmplwi(CCR0, sig_byte, 'V'); // void cannot appear since we do not parse the return type
   //  __ beq(CCR0, do_void);
   __ bind(do_dontreachhere);
   __ unimplemented("ShouldNotReachHere in slow_signature_handler", 120);
   __ bind(do_array);
   {
     Label start_skip, end_skip;
     __ bind(start_skip);
     __ lbzu(sig_byte, 1, signature);
     __ cmplwi(CCR0, sig_byte, '[');
     __ beq(CCR0, start_skip); // skip further brackets
     __ cmplwi(CCR0, sig_byte, '9');
     __ bgt(CCR0, end_skip);   // no optional size
     __ cmplwi(CCR0, sig_byte, '0');
     __ bge(CCR0, start_skip); // skip optional size
     __ bind(end_skip);
     __ cmplwi(CCR0, sig_byte, 'L');
     __ beq(CCR0, do_object);  // for arrays of objects, the name of the object must be skipped
     __ b(do_boxed);          // otherwise, go directly to do_boxed
   }
   __ bind(do_object);
   {
     Label L;
     __ bind(L);
     __ lbzu(sig_byte, 1, signature);
     __ cmplwi(CCR0, sig_byte, ';');
     __ bne(CCR0, L);
    }
   // Need to box the Java object here, so we use arg_java (address of
   // current Java stack slot) as argument and don't dereference it as
   // in case of ints, floats, etc.
   Label do_null;
   __ bind(do_boxed);
   __ ld(R0,0, arg_java);
   __ cmpdi(CCR0, R0, 0);
   __ li(intSlot,0);
   __ beq(CCR0, do_null);
   __ mr(intSlot, arg_java);
   __ bind(do_null);
   __ std(intSlot, 0, arg_c);
   __ addi(arg_java, arg_java, -BytesPerWord);
   __ addi(arg_c, arg_c, BytesPerWord);
   __ cmplwi(CCR0, argcnt, max_int_register_arguments);
   __ blt(CCR0, move_intSlot_to_ARG);
   __ b(loop_start);
   __ bind(do_int);
   __ lwa(intSlot, 0, arg_java);
   __ std(intSlot, 0, arg_c);
   __ addi(arg_java, arg_java, -BytesPerWord);
   __ addi(arg_c, arg_c, BytesPerWord);
   __ cmplwi(CCR0, argcnt, max_int_register_arguments);
   __ blt(CCR0, move_intSlot_to_ARG);
   __ b(loop_start);
   __ bind(do_long);
   __ ld(intSlot, -BytesPerWord, arg_java);
   __ std(intSlot, 0, arg_c);
   __ addi(arg_java, arg_java, - 2 * BytesPerWord);
   __ addi(arg_c, arg_c, BytesPerWord);
   __ cmplwi(CCR0, argcnt, max_int_register_arguments);
   __ blt(CCR0, move_intSlot_to_ARG);
   __ b(loop_start);
   __ bind(do_float);
   __ lfs(floatSlot, 0, arg_java);
 #if defined(LINUX)
   __ stfs(floatSlot, 4, arg_c);
 #elif defined(AIX)
   __ stfs(floatSlot, 0, arg_c);
 #else
 #error "unknown OS"
 #endif
   __ addi(arg_java, arg_java, -BytesPerWord);
   __ addi(arg_c, arg_c, BytesPerWord);
   __ cmplwi(CCR0, fpcnt, max_fp_register_arguments);
   __ blt(CCR0, move_floatSlot_to_FARG);
   __ b(loop_start);
   __ bind(do_double);
   __ lfd(floatSlot, - BytesPerWord, arg_java);
   __ stfd(floatSlot, 0, arg_c);
   __ addi(arg_java, arg_java, - 2 * BytesPerWord);
   __ addi(arg_c, arg_c, BytesPerWord);
   __ cmplwi(CCR0, fpcnt, max_fp_register_arguments);
   __ blt(CCR0, move_floatSlot_to_FARG);
   __ b(loop_start);
   __ bind(loop_end);
   __ pop_frame();
   __ restore_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14));
   __ restore_LR_CR(R0);
   __ blr();
   Label move_int_arg, move_float_arg;
   __ bind(move_int_arg); // each case must consist of 2 instructions (otherwise adapt LogSizeOfTwoInstructions)
   __ mr(R5_ARG3, intSlot);  __ b(loop_start);
   __ mr(R6_ARG4, intSlot);  __ b(loop_start);
   __ mr(R7_ARG5, intSlot);  __ b(loop_start);
   __ mr(R8_ARG6, intSlot);  __ b(loop_start);
   __ mr(R9_ARG7, intSlot);  __ b(loop_start);
   __ mr(R10_ARG8, intSlot); __ b(loop_start);
   __ bind(move_float_arg); // each case must consist of 2 instructions (otherwise adapt LogSizeOfTwoInstructions)
   __ fmr(F1_ARG1, floatSlot);   __ b(loop_start);
   __ fmr(F2_ARG2, floatSlot);   __ b(loop_start);
   __ fmr(F3_ARG3, floatSlot);   __ b(loop_start);
   __ fmr(F4_ARG4, floatSlot);   __ b(loop_start);
   __ fmr(F5_ARG5, floatSlot);   __ b(loop_start);
   __ fmr(F6_ARG6, floatSlot);   __ b(loop_start);
   __ fmr(F7_ARG7, floatSlot);   __ b(loop_start);
   __ fmr(F8_ARG8, floatSlot);   __ b(loop_start);
   __ fmr(F9_ARG9, floatSlot);   __ b(loop_start);
   __ fmr(F10_ARG10, floatSlot); __ b(loop_start);
   __ fmr(F11_ARG11, floatSlot); __ b(loop_start);
   __ fmr(F12_ARG12, floatSlot); __ b(loop_start);
   __ fmr(F13_ARG13, floatSlot); __ b(loop_start);
   __ bind(move_intSlot_to_ARG);
   __ sldi(R0, argcnt, LogSizeOfTwoInstructions);
   __ load_const(R11_scratch1, move_int_arg); // Label must be bound here.
   __ add(R11_scratch1, R0, R11_scratch1);
   __ mtctr(R11_scratch1/*branch_target*/);
   __ bctr();
   __ bind(move_floatSlot_to_FARG);
   __ sldi(R0, fpcnt, LogSizeOfTwoInstructions);
   __ addi(fpcnt, fpcnt, 1);
   __ load_const(R11_scratch1, move_float_arg); // Label must be bound here.
   __ add(R11_scratch1, R0, R11_scratch1);
   __ mtctr(R11_scratch1/*branch_target*/);
   __ bctr();
   return entry;
 }
 address AbstractInterpreterGenerator::generate_result_handler_for(BasicType type) {
   //
   // Registers alive
   //   R3_RET
   //   LR
   //
   // Registers updated
   //   R3_RET
   //
   Label done;
   Label is_false;
   address entry = __ pc();
   switch (type) {
   case T_BOOLEAN:
     __ cmpwi(CCR0, R3_RET, 0);
     __ beq(CCR0, is_false);
     __ li(R3_RET, 1);
     __ b(done);
     __ bind(is_false);
     __ li(R3_RET, 0);
     break;
   case T_BYTE:
      // sign extend 8 bits
      __ extsb(R3_RET, R3_RET);
      break;
   case T_CHAR:
      // zero extend 16 bits
      __ clrldi(R3_RET, R3_RET, 48);
      break;
   case T_SHORT:
      // sign extend 16 bits
      __ extsh(R3_RET, R3_RET);
      break;
   case T_INT:
      // sign extend 32 bits
      __ extsw(R3_RET, R3_RET);
      break;
   case T_LONG:
      break;
   case T_OBJECT:
     // unbox result if not null
     __ cmpdi(CCR0, R3_RET, 0);
     __ beq(CCR0, done);
     __ ld(R3_RET, 0, R3_RET);
     __ verify_oop(R3_RET);
     break;
   case T_FLOAT:
      break;
   case T_DOUBLE:
      break;
   case T_VOID:
      break;
   default: ShouldNotReachHere();
   }
   __ BIND(done);
   __ blr();
   return entry;
 }
 // Abstract method entry.
 //
 address InterpreterGenerator::generate_abstract_entry(void) {
   address entry = __ pc();
   //
   // Registers alive
   //   R16_thread     - JavaThread*
   //   R19_method     - callee's methodOop (method to be invoked)
   //   R1_SP          - SP prepared such that caller's outgoing args are near top
   //   LR             - return address to caller
   //
   // Stack layout at this point:
   //
   //   0       [TOP_IJAVA_FRAME_ABI]         <-- R1_SP
   //           alignment (optional)
   //           [outgoing Java arguments]
   //           ...
   //   PARENT  [PARENT_IJAVA_FRAME_ABI]
   //            ...
   //
   // Can't use call_VM here because we have not set up a new
   // interpreter state. Make the call to the vm and make it look like
   // our caller set up the JavaFrameAnchor.
   __ set_top_ijava_frame_at_SP_as_last_Java_frame(R1_SP, R12_scratch2/*tmp*/);
   // Push a new C frame and save LR.
   __ save_LR_CR(R0);
   __ push_frame_abi112_nonvolatiles(0, R11_scratch1);
   // This is not a leaf but we have a JavaFrameAnchor now and we will
   // check (create) exceptions afterward so this is ok.
   __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError));
   // Pop the C frame and restore LR.
   __ pop_frame();
   __ restore_LR_CR(R0);
   // Reset JavaFrameAnchor from call_VM_leaf above.
   __ reset_last_Java_frame();
   // Return to frame manager, it will handle the pending exception.
   __ blr();
   return entry;
 }
 // Call an accessor method (assuming it is resolved, otherwise drop into
 // vanilla (slow path) entry.
 address InterpreterGenerator::generate_accessor_entry(void) {
   if(!UseFastAccessorMethods && (!FLAG_IS_ERGO(UseFastAccessorMethods)))
     return NULL;
   Label Ldone, Lslow_path;
   const Register Rthis = R3_ARG1,
          Rconst_method = R4_ARG2,
          Rcodes        = Rconst_method,
          Rcpool_cache  = R5_ARG3,
          Rscratch      = R11_scratch1,
          Rjvmti_mode   = Rscratch,
          Roffset       = R12_scratch2,
          Rflags        = R6_ARG4;
   address entry = __ pc();
   // Check for safepoint:
   // Ditch this, real man don't need safepoint checks.
   // Also check for JVMTI mode
   // Check for null obj, take slow path if so.
 #ifdef CC_INTERP
   __ ld(Rthis, Interpreter::stackElementSize, R17_tos);
 #else
   Unimplemented()
 #endif
   __ lwz(Rjvmti_mode, thread_(interp_only_mode));
   __ cmpdi(CCR1, Rthis, 0);
   __ cmpwi(CCR0, Rjvmti_mode, 0);
   __ crorc(/*CCR0 eq*/2, /*CCR1 eq*/4+2, /*CCR0 eq*/2);
   __ beq(CCR0, Lslow_path); // this==null or jvmti_mode!=0
   // Do 2 things in parallel:
   // 1. Load the index out of the first instruction word, which looks like this:
   //    <0x2a><0xb4><index (2 byte, native endianess)>.
   // 2. Load constant pool cache base.
   __ ld(Rconst_method, in_bytes(Method::const_offset()), R19_method);
   __ ld(Rcpool_cache, in_bytes(ConstMethod::constants_offset()), Rconst_method);
   __ lhz(Rcodes, in_bytes(ConstMethod::codes_offset()) + 2, Rconst_method); // Lower half of 32 bit field.
   __ ld(Rcpool_cache, ConstantPool::cache_offset_in_bytes(), Rcpool_cache);
   // Get the const pool entry by means of <index>.
   const int codes_shift = exact_log2(in_words(ConstantPoolCacheEntry::size()) * BytesPerWord);
   __ slwi(Rscratch, Rcodes, codes_shift); // (codes&0xFFFF)<<codes_shift
   __ add(Rcpool_cache, Rscratch, Rcpool_cache);
   // Check if cpool cache entry is resolved.
   // We are resolved if the indices offset contains the current bytecode.
   ByteSize cp_base_offset = ConstantPoolCache::base_offset();
   // Big Endian:
   __ lbz(Rscratch, in_bytes(cp_base_offset) + in_bytes(ConstantPoolCacheEntry::indices_offset()) + 7 - 2, Rcpool_cache);
   __ cmpwi(CCR0, Rscratch, Bytecodes::_getfield);
   __ bne(CCR0, Lslow_path);
   __ isync(); // Order succeeding loads wrt. load of _indices field from cpool_cache.
   // Finally, start loading the value: Get cp cache entry into regs.
   __ ld(Rflags, in_bytes(cp_base_offset) + in_bytes(ConstantPoolCacheEntry::flags_offset()), Rcpool_cache);
   __ ld(Roffset, in_bytes(cp_base_offset) + in_bytes(ConstantPoolCacheEntry::f2_offset()), Rcpool_cache);
   // Get field type.
   // (Rflags>>ConstantPoolCacheEntry::tos_state_shift)&((1<<ConstantPoolCacheEntry::tos_state_bits)-1)
   __ rldicl(Rflags, Rflags, 64-ConstantPoolCacheEntry::tos_state_shift, 64-ConstantPoolCacheEntry::tos_state_bits);
 #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", 0x543);
 #endif // ASSERT
   __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
   // Load the return value according to field type.
   Label Litos, Lltos, Lbtos, Lctos, Lstos;
   __ cmpdi(CCR1, Rflags, itos);
   __ cmpdi(CCR0, Rflags, ltos);
   __ beq(CCR1, Litos);
   __ beq(CCR0, Lltos);
   __ cmpdi(CCR1, Rflags, btos);
   __ cmpdi(CCR0, Rflags, ctos);
   __ beq(CCR1, Lbtos);
   __ beq(CCR0, Lctos);
   __ cmpdi(CCR1, Rflags, stos);
   __ beq(CCR1, Lstos);
 #ifdef ASSERT
   __ cmpdi(CCR0, Rflags, atos);
   __ asm_assert_eq("what type is this?", 0x432);
 #endif
   // fallthru: __ bind(Latos);
   __ load_heap_oop(R3_RET, (RegisterOrConstant)Roffset, Rthis);
   __ blr();
   __ bind(Litos);
   __ lwax(R3_RET, Rthis, Roffset);
   __ blr();
   __ bind(Lltos);
   __ ldx(R3_RET, Rthis, Roffset);
   __ blr();
   __ bind(Lbtos);
   __ lbzx(R3_RET, Rthis, Roffset);
   __ extsb(R3_RET, R3_RET);
   __ blr();
   __ bind(Lctos);
   __ lhzx(R3_RET, Rthis, Roffset);
   __ blr();
   __ bind(Lstos);
   __ lhax(R3_RET, Rthis, Roffset);
   __ blr();
   __ bind(Lslow_path);
   assert(Interpreter::entry_for_kind(Interpreter::zerolocals), "Normal entry must have been generated by now");
   __ load_const_optimized(Rscratch, Interpreter::entry_for_kind(Interpreter::zerolocals), R0);
   __ mtctr(Rscratch);
   __ bctr();
   __ flush();
   return entry;
 }
 // Interpreter intrinsic for WeakReference.get().
 // 1. Don't push a full blown frame and go on dispatching, but fetch the value
 //    into R8 and return quickly
 // 2. If G1 is active we *must* execute this intrinsic for corrrectness:
 //    It contains a GC barrier which puts the reference into the satb buffer
 //    to indicate that someone holds a strong reference to the object the
 //    weak ref points to!
 address InterpreterGenerator::generate_Reference_get_entry(void) {
   // Code: _aload_0, _getfield, _areturn
   // parameter size = 1
   //
   // The code that gets generated by this routine is split into 2 parts:
   //    1. the "intrinsified" code for G1 (or any SATB based GC),
   //    2. the slow path - which is an expansion of the regular method entry.
   //
   // Notes:
   // * In the G1 code we do not check whether we need to block for
   //   a safepoint. If G1 is enabled then we must execute the specialized
   //   code for Reference.get (except when the Reference object is null)
   //   so that we can log the value in the referent field with an SATB
   //   update buffer.
   //   If the code for the getfield template is modified so that the
   //   G1 pre-barrier code is executed when the current method is
   //   Reference.get() then going through the normal method entry
   //   will be fine.
   // * The G1 code can, however, check the receiver object (the instance
   //   of java.lang.Reference) and jump to the slow path if null. If the
   //   Reference object is null then we obviously cannot fetch the referent
   //   and so we don't need to call the G1 pre-barrier. Thus we can use the
   //   regular method entry code to generate the NPE.
   //
   // This code is based on generate_accessor_enty.
   address entry = __ pc();
   const int referent_offset = java_lang_ref_Reference::referent_offset;
   guarantee(referent_offset > 0, "referent offset not initialized");
   if (UseG1GC) {
      Label slow_path;
     // Debugging not possible, so can't use __ skip_if_jvmti_mode(slow_path, GR31_SCRATCH);
     // In the G1 code we don't check if we need to reach a safepoint. We
     // continue and the thread will safepoint at the next bytecode dispatch.
     // If the receiver is null then it is OK to jump to the slow path.
 #ifdef CC_INTERP
      __ ld(R3_RET, Interpreter::stackElementSize, R17_tos); // get receiver
 #else
      Unimplemented();
 #endif
     // Check if receiver == NULL and go the slow path.
     __ cmpdi(CCR0, R3_RET, 0);
     __ beq(CCR0, slow_path);
     // Load the value of the referent field.
     __ load_heap_oop_not_null(R3_RET, referent_offset, R3_RET);
     // Generate the G1 pre-barrier code to log the value of
     // the referent field in an SATB buffer. Note with
     // these parameters the pre-barrier does not generate
     // the load of the previous value.
     // Restore caller sp for c2i case.
 #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", 0x544);
 #endif // ASSERT
     __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
     __ g1_write_barrier_pre(noreg,         // obj
                             noreg,         // offset
                             R3_RET,        // pre_val
                             R11_scratch1,  // tmp
                             R12_scratch2,  // tmp
                             true);         // needs_frame
     __ blr();
     // Generate regular method entry.
     __ bind(slow_path);
     assert(Interpreter::entry_for_kind(Interpreter::zerolocals), "Normal entry must have been generated by now");
     __ load_const_optimized(R11_scratch1, Interpreter::entry_for_kind(Interpreter::zerolocals), R0);
     __ mtctr(R11_scratch1);
     __ bctr();
     __ flush();
     return entry;
   } else {
     return generate_accessor_entry();
   }
 }
 void Deoptimization::unwind_callee_save_values(frame* f, vframeArray* vframe_array) {
   // This code is sort of the equivalent of C2IAdapter::setup_stack_frame back in
   // the days we had adapter frames. When we deoptimize a situation where a
   // compiled caller calls a compiled caller will have registers it expects
   // to survive the call to the callee. If we deoptimize the callee the only
   // way we can restore these registers is to have the oldest interpreter
   // frame that we create restore these values. That is what this routine
   // will accomplish.
   // At the moment we have modified c2 to not have any callee save registers
   // so this problem does not exist and this routine is just a place holder.
   assert(f->is_interpreted_frame(), "must be interpreted");
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/ppc/vm/interpreter_ppc.cpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/interpreter_ppc.cpp