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

src/cpu/ppc/vm/vtableStubs_ppc_64.cpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/vtableStubs_ppc_64.cpp

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

author: goetz
date: Wed, 27 Nov 2013 16:16:21 -0800
changeset 6490: 41b780b43b74
parent 6486: b0133e4187d3
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 "code/vtableStubs.hpp"
 #include "interp_masm_ppc_64.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/klassVtable.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "vmreg_ppc.inline.hpp"
 #ifdef COMPILER2
 #include "opto/runtime.hpp"
 #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 ":")
 #ifndef PRODUCT
 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
 #endif
 // Used by compiler only; may use only caller saved, non-argument
 // registers.
 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
   // PPC port: use fixed size.
   const int code_length = VtableStub::pd_code_size_limit(true);
   VtableStub* s = new (code_length) VtableStub(true, vtable_index);
   ResourceMark rm;
   CodeBuffer cb(s->entry_point(), code_length);
   MacroAssembler* masm = new MacroAssembler(&cb);
   address start_pc;
 #ifndef PRODUCT
   if (CountCompiledCalls) {
     __ load_const(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr());
     __ lwz(R12_scratch2, 0, R11_scratch1);
     __ addi(R12_scratch2, R12_scratch2, 1);
     __ stw(R12_scratch2, 0, R11_scratch1);
   }
 #endif
   assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
   // Get receiver klass.
   const Register rcvr_klass = R11_scratch1;
   // We might implicit NULL fault here.
   address npe_addr = __ pc(); // npe = null pointer exception
   __ load_klass_with_trap_null_check(rcvr_klass, R3);
  // Set methodOop (in case of interpreted method), and destination address.
   int entry_offset = InstanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
 #ifndef PRODUCT
   if (DebugVtables) {
     Label L;
     // Check offset vs vtable length.
     const Register vtable_len = R12_scratch2;
     __ lwz(vtable_len, InstanceKlass::vtable_length_offset()*wordSize, rcvr_klass);
     __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());
     __ bge(CCR0, L);
     __ li(R12_scratch2, vtable_index);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);
     __ bind(L);
   }
 #endif
   int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();
   __ ld(R19_method, v_off, rcvr_klass);
 #ifndef PRODUCT
   if (DebugVtables) {
     Label L;
     __ cmpdi(CCR0, R19_method, 0);
     __ bne(CCR0, L);
     __ stop("Vtable entry is ZERO", 102);
     __ bind(L);
   }
 #endif
   // If the vtable entry is null, the method is abstract.
   address ame_addr = __ pc(); // ame = abstract method error
   __ ld_with_trap_null_check(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
   __ mtctr(R12_scratch2);
   __ bctr();
   masm->flush();
   guarantee(__ pc() <= s->code_end(), "overflowed buffer");
   s->set_exception_points(npe_addr, ame_addr);
   return s;
 }
 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
   // PPC port: use fixed size.
   const int code_length = VtableStub::pd_code_size_limit(false);
   VtableStub* s = new (code_length) VtableStub(false, vtable_index);
   ResourceMark rm;
   CodeBuffer cb(s->entry_point(), code_length);
   MacroAssembler* masm = new MacroAssembler(&cb);
   address start_pc;
 #ifndef PRODUCT
   if (CountCompiledCalls) {
     __ load_const(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr());
     __ lwz(R12_scratch2, 0, R11_scratch1);
     __ addi(R12_scratch2, R12_scratch2, 1);
     __ stw(R12_scratch2, 0, R11_scratch1);
   }
 #endif
   assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
   // Entry arguments:
   //  R19_method: Interface
   //  R3_ARG1: Receiver
   //
   const Register rcvr_klass = R11_scratch1;
   const Register vtable_len = R12_scratch2;
   const Register itable_entry_addr = R21_tmp1;
   const Register itable_interface = R22_tmp2;
   // Get receiver klass.
   // We might implicit NULL fault here.
   address npe_addr = __ pc(); // npe = null pointer exception
   __ load_klass_with_trap_null_check(rcvr_klass, R3_ARG1);
   //__ ld(rcvr_klass, oopDesc::klass_offset_in_bytes(), R3_ARG1);
   BLOCK_COMMENT("Load start of itable entries into itable_entry.");
   __ lwz(vtable_len, InstanceKlass::vtable_length_offset() * wordSize, rcvr_klass);
   __ slwi(vtable_len, vtable_len, exact_log2(vtableEntry::size() * wordSize));
   __ add(itable_entry_addr, vtable_len, rcvr_klass);
   // Loop over all itable entries until desired interfaceOop(Rinterface) found.
   BLOCK_COMMENT("Increment itable_entry_addr in loop.");
   const int vtable_base_offset = InstanceKlass::vtable_start_offset() * wordSize;
   __ addi(itable_entry_addr, itable_entry_addr, vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes());
   const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize;
   Label search;
   __ bind(search);
   __ ld(itable_interface, 0, itable_entry_addr);
   // Handle IncompatibleClassChangeError in itable stubs.
   // If the entry is NULL then we've reached the end of the table
   // without finding the expected interface, so throw an exception.
   BLOCK_COMMENT("Handle IncompatibleClassChangeError in itable stubs.");
   Label throw_icce;
   __ cmpdi(CCR1, itable_interface, 0);
   __ cmpd(CCR0, itable_interface, R19_method);
   __ addi(itable_entry_addr, itable_entry_addr, itable_offset_search_inc);
   __ beq(CCR1, throw_icce);
   __ bne(CCR0, search);
   // Entry found and itable_entry_addr points to it, get offset of vtable for interface.
   const Register vtable_offset = R12_scratch2;
   const Register itable_method = R11_scratch1;
   const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() -
                                     itableOffsetEntry::interface_offset_in_bytes()) -
                                    itable_offset_search_inc;
   __ lwz(vtable_offset, vtable_offset_offset, itable_entry_addr);
   // Compute itableMethodEntry and get methodOop and entry point for compiler.
   const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) +
     itableMethodEntry::method_offset_in_bytes();
   __ add(itable_method, rcvr_klass, vtable_offset);
   __ ld(R19_method, method_offset, itable_method);
 #ifndef PRODUCT
   if (DebugVtables) {
     Label ok;
     __ cmpd(CCR0, R19_method, 0);
     __ bne(CCR0, ok);
     __ stop("methodOop is null", 103);
     __ bind(ok);
   }
 #endif
   // If the vtable entry is null, the method is abstract.
   address ame_addr = __ pc(); // ame = abstract method error
   // Must do an explicit check if implicit checks are disabled.
   assert(!MacroAssembler::needs_explicit_null_check(in_bytes(Method::from_compiled_offset())), "sanity");
   if (!ImplicitNullChecks || !os::zero_page_read_protected()) {
     if (TrapBasedNullChecks) {
       __ trap_null_check(R19_method);
     } else {
       __ cmpdi(CCR0, R19_method, 0);
       __ beq(CCR0, throw_icce);
     }
   }
   __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
   __ mtctr(R12_scratch2);
   __ bctr();
   // Handle IncompatibleClassChangeError in itable stubs.
   // More detailed error message.
   // We force resolving of the call site by jumping to the "handle
   // wrong method" stub, and so let the interpreter runtime do all the
   // dirty work.
   __ bind(throw_icce);
   __ load_const(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub());
   __ mtctr(R11_scratch1);
   __ bctr();
   masm->flush();
   guarantee(__ pc() <= s->code_end(), "overflowed buffer");
   s->set_exception_points(npe_addr, ame_addr);
   return s;
 }
 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
   if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) {
     return 1000;
   } else {
     int decode_klass_size = MacroAssembler::instr_size_for_decode_klass_not_null();
     if (is_vtable_stub) {
       return 20 + decode_klass_size +  8 + 8;   // Plain + cOops + Traps + safety
     } else {
       return 96 + decode_klass_size + 12 + 8;   // Plain + cOops + Traps + safety
     }
   }
 }
 int VtableStub::pd_code_alignment() {
   const unsigned int icache_line_size = 32;
   return icache_line_size;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/ppc/vm/vtableStubs_ppc_64.cpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/vtableStubs_ppc_64.cpp