| /* |
| * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * 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/macroAssembler.inline.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "interp_masm_sparc.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/klassVtable.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "vmreg_sparc.inline.hpp" |
| #ifdef COMPILER2 |
| #include "opto/runtime.hpp" |
| #endif |
| |
| // machine-dependent part of VtableStubs: create vtableStub of correct size and |
| // initialize its code |
| |
| #define __ masm-> |
| |
| |
| #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 |
| // NOTE: %%%% if any change is made to this stub make sure that the function |
| // pd_code_size_limit is changed to ensure the correct size for VtableStub |
| VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { |
| const int sparc_code_length = VtableStub::pd_code_size_limit(true); |
| VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index); |
| // Can be NULL if there is no free space in the code cache. |
| if (s == NULL) { |
| return NULL; |
| } |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), sparc_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| |
| #ifndef PRODUCT |
| if (CountCompiledCalls) { |
| __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch); |
| } |
| #endif /* PRODUCT */ |
| |
| assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0"); |
| |
| // get receiver klass |
| address npe_addr = __ pc(); |
| __ load_klass(O0, G3_scratch); |
| |
| // set Method* (in case of interpreted method), and destination address |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L; |
| // check offset vs vtable length |
| __ ld(G3_scratch, in_bytes(Klass::vtable_length_offset()), G5); |
| __ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L); |
| __ set(vtable_index, O2); |
| __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2); |
| __ bind(L); |
| } |
| #endif |
| |
| __ lookup_virtual_method(G3_scratch, vtable_index, G5_method); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L; |
| __ br_notnull_short(G5_method, Assembler::pt, L); |
| __ stop("Vtable entry is ZERO"); |
| __ bind(L); |
| } |
| #endif |
| |
| address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract |
| // NOTE: for vtable dispatches, the vtable entry will never be null. |
| |
| __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); |
| |
| // jump to target (either compiled code or c2iadapter) |
| __ JMP(G3_scratch, 0); |
| // load Method* (in case we call c2iadapter) |
| __ delayed()->nop(); |
| |
| masm->flush(); |
| |
| if (PrintMiscellaneous && (WizardMode || Verbose)) { |
| tty->print_cr("vtable #%d at " PTR_FORMAT "[%d] left over: %d", |
| vtable_index, p2i(s->entry_point()), |
| (int)(s->code_end() - s->entry_point()), |
| (int)(s->code_end() - __ pc())); |
| } |
| guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
| // shut the door on sizing bugs |
| int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one |
| assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); |
| |
| s->set_exception_points(npe_addr, ame_addr); |
| return s; |
| } |
| |
| |
| // NOTE: %%%% if any change is made to this stub make sure that the function |
| // pd_code_size_limit is changed to ensure the correct size for VtableStub |
| VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
| const int sparc_code_length = VtableStub::pd_code_size_limit(false); |
| VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index); |
| // Can be NULL if there is no free space in the code cache. |
| if (s == NULL) { |
| return NULL; |
| } |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), sparc_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| |
| Register G3_Klass = G3_scratch; |
| Register G5_interface = G5; // Passed in as an argument |
| Label search; |
| |
| // Entry arguments: |
| // G5_interface: Interface |
| // O0: Receiver |
| assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0"); |
| |
| // get receiver klass (also an implicit null-check) |
| address npe_addr = __ pc(); |
| __ load_klass(O0, G3_Klass); |
| |
| // Push a new window to get some temp registers. This chops the head of all |
| // my 64-bit %o registers in the LION build, but this is OK because no longs |
| // are passed in the %o registers. Instead, longs are passed in G1 and G4 |
| // and so those registers are not available here. |
| __ save(SP,-frame::register_save_words*wordSize,SP); |
| |
| #ifndef PRODUCT |
| if (CountCompiledCalls) { |
| __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1); |
| } |
| #endif /* PRODUCT */ |
| |
| Label throw_icce; |
| |
| Register L5_method = L5; |
| __ lookup_interface_method(// inputs: rec. class, interface, itable index |
| G3_Klass, G5_interface, itable_index, |
| // outputs: method, scan temp. reg |
| L5_method, L2, L3, |
| throw_icce); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L01; |
| __ br_notnull_short(L5_method, Assembler::pt, L01); |
| __ stop("Method* is null"); |
| __ bind(L01); |
| } |
| #endif |
| |
| // If the following load is through a NULL pointer, we'll take an OS |
| // exception that should translate into an AbstractMethodError. We need the |
| // window count to be correct at that time. |
| __ restore(L5_method, 0, G5_method); |
| // Restore registers *before* the AME point. |
| |
| address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract |
| __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); |
| |
| // G5_method: Method* |
| // O0: Receiver |
| // G3_scratch: entry point |
| __ JMP(G3_scratch, 0); |
| __ delayed()->nop(); |
| |
| __ bind(throw_icce); |
| AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); |
| __ jump_to(icce, G3_scratch); |
| __ delayed()->restore(); |
| |
| masm->flush(); |
| |
| if (PrintMiscellaneous && (WizardMode || Verbose)) { |
| tty->print_cr("itable #%d at " PTR_FORMAT "[%d] left over: %d", |
| itable_index, p2i(s->entry_point()), |
| (int)(s->code_end() - s->entry_point()), |
| (int)(s->code_end() - __ pc())); |
| } |
| guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
| // shut the door on sizing bugs |
| int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one |
| assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); |
| |
| s->set_exception_points(npe_addr, ame_addr); |
| return s; |
| } |
| |
| |
| int VtableStub::pd_code_size_limit(bool is_vtable_stub) { |
| if (DebugVtables || CountCompiledCalls || VerifyOops) return 1000; |
| else { |
| const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets) |
| if (is_vtable_stub) { |
| // ld;ld;ld,jmp,nop |
| const int basic = 5*BytesPerInstWord + |
| // shift;add for load_klass (only shift with zero heap based) |
| (UseCompressedClassPointers ? |
| MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
| return basic + slop; |
| } else { |
| const int basic = 34 * BytesPerInstWord + |
| // shift;add for load_klass (only shift with zero heap based) |
| (UseCompressedClassPointers ? |
| MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
| return (basic + slop); |
| } |
| } |
| |
| // In order to tune these parameters, run the JVM with VM options |
| // +PrintMiscellaneous and +WizardMode to see information about |
| // actual itable stubs. Look for lines like this: |
| // itable #1 at 0x5551212[116] left over: 8 |
| // Reduce the constants so that the "left over" number is 8 |
| // Do not aim at a left-over number of zero, because a very |
| // large vtable or itable offset (> 4K) will require an extra |
| // sethi/or pair of instructions. |
| // |
| // The JVM98 app. _202_jess has a megamorphic interface call. |
| // The itable code looks like this: |
| // Decoding VtableStub itbl[1]@16 |
| // ld [ %o0 + 4 ], %g3 |
| // save %sp, -64, %sp |
| // ld [ %g3 + 0xe8 ], %l2 |
| // sll %l2, 2, %l2 |
| // add %l2, 0x134, %l2 |
| // add %g3, %l2, %l2 |
| // add %g3, 4, %g3 |
| // ld [ %l2 ], %l5 |
| // brz,pn %l5, throw_icce |
| // cmp %l5, %g5 |
| // be %icc, success |
| // add %l2, 8, %l2 |
| // loop: |
| // ld [ %l2 ], %l5 |
| // brz,pn %l5, throw_icce |
| // cmp %l5, %g5 |
| // bne,pn %icc, loop |
| // add %l2, 8, %l2 |
| // success: |
| // ld [ %l2 + -4 ], %l2 |
| // ld [ %g3 + %l2 ], %l5 |
| // restore %l5, 0, %g5 |
| // ld [ %g5 + 0x44 ], %g3 |
| // jmp %g3 |
| // nop |
| // throw_icce: |
| // sethi %hi(throw_ICCE_entry), %g3 |
| // ! 5 more instructions here, LP64_ONLY |
| // jmp %g3 + %lo(throw_ICCE_entry) |
| // restore |
| } |
| |
| |
| int VtableStub::pd_code_alignment() { |
| // UltraSPARC cache line size is 8 instructions: |
| const unsigned int icache_line_size = 32; |
| return icache_line_size; |
| } |