--- old/src/hotspot/cpu/sparc/vtableStubs_sparc.cpp 2020-05-20 18:09:26.720955200 -0700 +++ /dev/null 2020-03-09 18:57:19.455001459 -0700 @@ -1,268 +0,0 @@ -/* - * Copyright (c) 1997, 2018, 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/compiledICHolder.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 -VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { - // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. - const int stub_code_length = code_size_limit(true); - VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index); - // Can be NULL if there is no free space in the code cache. - if (s == NULL) { - return NULL; - } - - // Count unused bytes in instruction sequences of variable size. - // We add them to the computed buffer size in order to avoid - // overflow in subsequently generated stubs. - address start_pc; - int slop_bytes = 0; - int slop_delta = 0; - const int index_dependent_slop = ((vtable_index < 512) ? 2 : 0)*BytesPerInstWord; // code size change with transition from 13-bit to 32-bit constant (@index == 512?). - - ResourceMark rm; - CodeBuffer cb(s->entry_point(), stub_code_length); - MacroAssembler* masm = new MacroAssembler(&cb); - -#if (!defined(PRODUCT) && defined(COMPILER2)) - 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); - -#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 generates 8 instructions (worst case), 1 instruction (best case) - start_pc = __ pc(); - __ set(vtable_index, O2); - slop_delta = __ worst_case_insts_for_set()*BytesPerInstWord - (__ pc() - start_pc); - slop_bytes += slop_delta; - assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); - - // there is no variance in call_VM() emitted code. - __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2); - __ bind(L); - } -#endif - - // set Method* (in case of interpreted method), and destination address - start_pc = __ pc(); - __ lookup_virtual_method(G3_scratch, vtable_index, G5_method); - // lookup_virtual_method generates 3 instructions (worst case), 1 instruction (best case) - slop_delta = 3*BytesPerInstWord - (int)(__ pc() - start_pc); - slop_bytes += slop_delta; - assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); - -#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(); - slop_bytes += index_dependent_slop; // add'l slop for size variance due to large itable offsets - bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, index_dependent_slop); - - return s; -} - - -VtableStub* VtableStubs::create_itable_stub(int itable_index) { - // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. - const int stub_code_length = code_size_limit(false); - VtableStub* s = new(stub_code_length) VtableStub(false, itable_index); - // Can be NULL if there is no free space in the code cache. - if (s == NULL) { - return NULL; - } - // Count unused bytes in instruction sequences of variable size. - // We add them to the computed buffer size in order to avoid - // overflow in subsequently generated stubs. - address start_pc; - int slop_bytes = 0; - int slop_delta = 0; - const int index_dependent_slop = ((itable_index < 512) ? 2 : 0)*BytesPerInstWord; // code size change with transition from 13-bit to 32-bit constant (@index == 512?). - - ResourceMark rm; - CodeBuffer cb(s->entry_point(), stub_code_length); - MacroAssembler* masm = new MacroAssembler(&cb); - -#if (!defined(PRODUCT) && defined(COMPILER2)) - if (CountCompiledCalls) { -// Use G3_scratch, G4_scratch as work regs for inc_counter. -// These are defined before use further down. - __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G3_scratch, G4_scratch); - } -#endif // PRODUCT - - Register G3_Klass = G3_scratch; - Register G5_icholder = G5; // Passed in as an argument - Register G4_interface = G4_scratch; - - // 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); - - Label L_no_such_interface; - Register L5_method = L5; - - start_pc = __ pc(); - - // Receiver subtype check against REFC. - __ ld_ptr(G5_icholder, CompiledICHolder::holder_klass_offset(), G4_interface); - __ lookup_interface_method(// inputs: rec. class, interface, itable index - G3_Klass, G4_interface, itable_index, - // outputs: scan temp. reg1, scan temp. reg2 - L5_method, L2, L3, - L_no_such_interface, - /*return_method=*/ false); - - const ptrdiff_t typecheckSize = __ pc() - start_pc; - start_pc = __ pc(); - - // Get Method* and entrypoint for compiler - __ ld_ptr(G5_icholder, CompiledICHolder::holder_metadata_offset(), G4_interface); - __ lookup_interface_method(// inputs: rec. class, interface, itable index - G3_Klass, G4_interface, itable_index, - // outputs: method, scan temp. reg - L5_method, L2, L3, - L_no_such_interface); - - const ptrdiff_t lookupSize = __ pc() - start_pc; - - // Reduce "estimate" such that "padding" does not drop below 8. - // Do not target a left-over number of zero, because a very - // large vtable or itable offset (> 4K) will require an extra - // sethi/or pair of instructions. - // Found typecheck(60) + lookup(72) to exceed previous extimate (32*4). - const ptrdiff_t estimate = 36*BytesPerInstWord; - const ptrdiff_t codesize = typecheckSize + lookupSize + index_dependent_slop; - slop_delta = (int)(estimate - codesize); - slop_bytes += slop_delta; - assert(slop_delta >= 0, "itable #%d: Code size estimate (%d) for lookup_interface_method too small, required: %d", itable_index, (int)estimate, (int)codesize); - -#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(L_no_such_interface); - // 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. - AddressLiteral icce(SharedRuntime::get_handle_wrong_method_stub()); - __ jump_to(icce, G3_scratch); - __ delayed()->restore(); - - masm->flush(); - slop_bytes += index_dependent_slop; // add'l slop for size variance due to large itable offsets - bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, index_dependent_slop); - - return s; -} - -int VtableStub::pd_code_alignment() { - // UltraSPARC cache line size is 8 instructions: - const unsigned int icache_line_size = 32; - return icache_line_size; -}