Mercurial > hg > truffle
view src/share/vm/c1x/c1x_CodeInstaller.cpp @ 1433:efba53f86c4f
various fixes and enhancements
* correct refmap->oopmap conversion (register numbering, stack slot numbering)
* fixes for inlining (correct scoping in exception handler lookup, NPE in scope conversion)
* support for "jump to runtime stub" (patching code needs to be aware of jmp instruction)
* provide more information about methods (to allow inlining: has_balanced_monitors, etc.)
* fixes to signature type lookup
* isSubTypeOf: correct handling of array classes
* RiType: componentType/arrayOf
* prologue: inline cache check, icmiss stub
* klass state check (resolved but not initialized) in newinstance
* card table write barriers
* c1x classes are optional (to allow running c1 without them)
* correct for stored frame pointer in calling conventions (methods with arguments on stack)
* getType(Class<?>) for some basic types, used for optimizations and folding
* RiMethod/RiType: throw exception instead of silent failure on unsupported operations
* RiType: resolved/unresolved array type support
* refactoring: new on-demand template generation mechanism
* optimizations: template specialization for no_null_check, given length, etc.
author | Lukas Stadler <lukas.stadler@oracle.com> |
---|---|
date | Thu, 16 Sep 2010 19:42:20 -0700 |
parents | b61a43cd1255 |
children | 72cfb36c6bb2 |
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/* * Copyright 2000-2010 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/_c1x_CodeInstaller.cpp.incl" // TODO this should be handled in a more robust way - not hard coded... Register CPU_REGS[] = { rax, rbx, rcx, rdx, rsi, rdi, r11, r12, r13, r14 }; const static int NUM_CPU_REGS = 10; XMMRegister XMM_REGS[] = { xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15 }; const static int NUM_XMM_REGS = 16; const static int NUM_REGS = NUM_CPU_REGS + NUM_XMM_REGS; // convert c1x register indices (as used in oop maps) to hotspot registers VMReg get_hotspot_reg(jint c1x_reg) { assert(c1x_reg >= 0 && c1x_reg < NUM_REGS, "invalid register number"); if (c1x_reg < NUM_CPU_REGS) { return CPU_REGS[c1x_reg]->as_VMReg(); } else { return XMM_REGS[c1x_reg - NUM_CPU_REGS]->as_VMReg(); } } // creates a hotspot oop map out of the byte arrays provided by CiDebugInfo static OopMap* create_oop_map(jint frame_size, jint parameter_count, oop debug_info) { OopMap* map = new OopMap(frame_size, parameter_count); arrayOop register_map = (arrayOop) CiDebugInfo::registerRefMap(debug_info); arrayOop frame_map = (arrayOop) CiDebugInfo::frameRefMap(debug_info); assert(register_map->length() == (NUM_REGS + 7) / 8, "unexpected register_map length"); for (jint i = 0; i < NUM_REGS; i++) { unsigned char byte = ((unsigned char*) register_map->base(T_BYTE))[i / 8]; bool is_oop = (byte & (1 << (i % 8))) != 0; VMReg reg = get_hotspot_reg(i); if (is_oop) { map->set_oop(reg); } else { map->set_value(reg); } } if (frame_size > 0) { assert(frame_map->length() == ((frame_size / HeapWordSize) + 7) / 8, "unexpected register_map length"); for (jint i = 0; i < frame_size / HeapWordSize; i++) { unsigned char byte = ((unsigned char*) frame_map->base(T_BYTE))[i / 8]; bool is_oop = (byte & (1 << (i % 8))) != 0; // hotspot stack slots are 4 bytes VMReg reg = VMRegImpl::stack2reg(i * 2); if (is_oop) { map->set_oop(reg); } else { map->set_value(reg); } } } else { assert(frame_map == NULL || frame_map->length() == 0, "cannot have frame_map for frames with size 0"); } return map; } // TODO: finish this - c1x doesn't provide any scope values at the moment static ScopeValue* get_hotspot_value(oop value) { fatal("not implemented"); if (value->is_a(CiRegisterValue::klass())) { TRACE_C1X_4("register value"); IF_TRACE_C1X_4 value->print(); } else if (value->is_a(CiStackSlot::klass())) { TRACE_C1X_4("stack value"); IF_TRACE_C1X_4 value->print(); } else { ShouldNotReachHere(); } } // constructor used to create a method CodeInstaller::CodeInstaller(oop target_method) { VM_ENTRY_MARK; _env = CURRENT_ENV; initialize_fields(target_method); assert(_hotspot_method != NULL && _name == NULL, "installMethod needs NON-NULL method and NULL name"); assert(_hotspot_method->is_a(HotSpotMethodResolved::klass()), "installMethod needs a HotSpotMethodResolved"); // TODO: This is a hack.. Produce correct entries. _offsets.set_value(CodeOffsets::Exceptions, 0); _offsets.set_value(CodeOffsets::Deopt, 0); methodOop method = VmIds::get<methodOop>(HotSpotMethodResolved::vmId(_hotspot_method)); ciMethod *ciMethodObject = (ciMethod *) _env->get_object(method); _parameter_count = method->size_of_parameters(); // (very) conservative estimate: each site needs a relocation CodeBuffer buffer("temp c1x method", _total_size, _sites->length() * relocInfo::length_limit); initialize_buffer(buffer); process_exception_handlers(); { int stack_slots = (_frame_size / HeapWordSize) + 2; // conversion to words, need to add two slots for ret address and frame pointer ThreadToNativeFromVM t((JavaThread*) THREAD); _env->register_method(ciMethodObject, -1, &_offsets, 0, &buffer, stack_slots, _debug_recorder->_oopmaps, &_exception_handler_table, &_implicit_exception_table, C1XCompiler::instance(), _env->comp_level(), false, false); } } // constructor used to create a stub CodeInstaller::CodeInstaller(oop target_method, jlong& id) { VM_ENTRY_MARK; _env = CURRENT_ENV; initialize_fields(target_method); assert(_hotspot_method == NULL && _name != NULL, "installMethod needs NON-NULL name and NULL method"); // (very) conservative estimate: each site needs a relocation CodeBuffer buffer("temp c1x stub", _total_size, _sites->length() * relocInfo::length_limit); initialize_buffer(buffer); const char* cname = java_lang_String::as_utf8_string(_name); BufferBlob* blob = BufferBlob::create(strdup(cname), &buffer); // this is leaking strings... but only a limited number of stubs will be created IF_TRACE_C1X_3 Disassembler::decode((CodeBlob*) blob); id = VmIds::addStub(blob->instructions_begin()); } void CodeInstaller::initialize_fields(oop target_method) { _citarget_method = HotSpotTargetMethod::targetMethod(target_method); _hotspot_method = HotSpotTargetMethod::method(target_method); _name = HotSpotTargetMethod::name(target_method); _sites = (arrayOop) HotSpotTargetMethod::sites(target_method); _exception_handlers = (arrayOop) HotSpotTargetMethod::exceptionHandlers(target_method); _code = (arrayOop) CiTargetMethod::targetCode(_citarget_method); _code_size = CiTargetMethod::targetCodeSize(_citarget_method); _frame_size = CiTargetMethod::frameSize(_citarget_method); // (very) conservative estimate: each site needs a constant section entry _constants_size = _sites->length() * BytesPerLong; _total_size = align_size_up(_code_size, HeapWordSize) + _constants_size; _next_call_type = MARK_INVOKE_INVALID; } // perform data and call relocation on the CodeBuffer void CodeInstaller::initialize_buffer(CodeBuffer& buffer) { _oop_recorder = new OopRecorder(_env->arena()); _env->set_oop_recorder(_oop_recorder); _debug_recorder = new DebugInformationRecorder(_env->oop_recorder()); _debug_recorder->set_oopmaps(new OopMapSet()); _dependencies = new Dependencies(_env); _env->set_oop_recorder(_oop_recorder); _env->set_debug_info(_debug_recorder); _env->set_dependencies(_dependencies); buffer.initialize_oop_recorder(_oop_recorder); buffer.initialize_consts_size(_constants_size); _instructions = buffer.insts(); _constants = buffer.consts(); // copy the code into the newly created CodeBuffer memcpy(_instructions->start(), _code->base(T_BYTE), _code_size); _instructions->set_end(_instructions->start() + _code_size); oop* sites = (oop*) _sites->base(T_OBJECT); for (int i = 0; i < _sites->length(); i++) { oop site = sites[i]; jint pc_offset = CiTargetMethod_Site::pcOffset(site); if (site->is_a(CiTargetMethod_Safepoint::klass())) { TRACE_C1X_4("safepoint at %i", pc_offset); site_Safepoint(buffer, pc_offset, site); } else if (site->is_a(CiTargetMethod_Call::klass())) { TRACE_C1X_4("call at %i", pc_offset); site_Call(buffer, pc_offset, site); } else if (site->is_a(CiTargetMethod_DataPatch::klass())) { TRACE_C1X_4("datapatch at %i", pc_offset); site_DataPatch(buffer, pc_offset, site); } else if (site->is_a(CiTargetMethod_Mark::klass())) { TRACE_C1X_4("mark at %i", pc_offset); site_Mark(buffer, pc_offset, site); } else { fatal("unexpected Site subclass"); } } } void CodeInstaller::process_exception_handlers() { // allocate some arrays for use by the collection code. const int num_handlers = 5; GrowableArray<intptr_t>* bcis = new GrowableArray<intptr_t> (num_handlers); GrowableArray<intptr_t>* scope_depths = new GrowableArray<intptr_t> (num_handlers); GrowableArray<intptr_t>* pcos = new GrowableArray<intptr_t> (num_handlers); if (_exception_handlers != NULL) { oop* exception_handlers = (oop*) _exception_handlers->base(T_OBJECT); for (int i = 0; i < _exception_handlers->length(); i++) { jint pc_offset = CiTargetMethod_Site::pcOffset(exception_handlers[i]); int start = i; while ((i + 1) < _exception_handlers->length() && CiTargetMethod_Site::pcOffset(exception_handlers[i + 1]) == pc_offset) i++; // empty the arrays bcis->trunc_to(0); scope_depths->trunc_to(0); pcos->trunc_to(0); for (int j = start; j <= i; j++) { oop exc = exception_handlers[j]; jint handler_offset = CiTargetMethod_ExceptionHandler::handlerPos(exc); jint handler_bci = CiTargetMethod_ExceptionHandler::handlerBci(exc); jint bci = CiTargetMethod_ExceptionHandler::bci(exc); jint scope_level = CiTargetMethod_ExceptionHandler::scopeLevel(exc); Handle handler_type = CiTargetMethod_ExceptionHandler::exceptionType(exc); assert(handler_offset != -1, "must have been generated"); int e = bcis->find(handler_bci); if (e >= 0 && scope_depths->at(e) == scope_level) { // two different handlers are declared to dispatch to the same // catch bci. During parsing we created edges for each // handler but we really only need one. The exception handler // table will also get unhappy if we try to declare both since // it's nonsensical. Just skip this handler. continue; } bcis->append(handler_bci); if (handler_bci == -1) { // insert a wildcard handler at scope depth 0 so that the // exception lookup logic with find it. scope_depths->append(0); } else { scope_depths->append(scope_level); } pcos->append(handler_offset); // stop processing once we hit a catch any // if (handler->is_catch_all()) { // assert(i == handlers->length() - 1, "catch all must be last handler"); // } } _exception_handler_table.add_subtable(pc_offset, bcis, scope_depths, pcos); } } } void CodeInstaller::record_scope(jint pc_offset, oop code_pos, oop frame) { oop caller_pos = CiCodePos::caller(code_pos); if (caller_pos != NULL) { oop caller_frame = frame == NULL ? NULL : CiDebugInfo_Frame::caller(frame); record_scope(pc_offset, caller_pos, caller_frame); } else { assert(frame == NULL || CiDebugInfo_Frame::caller(frame) == NULL, "unexpected layout - mismatching nesting of Frame and CiCodePos"); } assert(frame == NULL || code_pos == CiDebugInfo_Frame::codePos(frame), "unexpected CiCodePos layout"); oop hotspot_method = CiCodePos::method(code_pos); assert(hotspot_method != NULL && hotspot_method->is_a(HotSpotMethodResolved::klass()), "unexpected hotspot method"); methodOop method = VmIds::get<methodOop>(HotSpotMethodResolved::vmId(hotspot_method)); ciMethod *cimethod = (ciMethod *) _env->get_object(method); jint bci = CiCodePos::bci(code_pos); if (frame != NULL) { jint local_count = CiDebugInfo_Frame::numLocals(frame); jint expression_count = CiDebugInfo_Frame::numStack(frame); jint monitor_count = CiDebugInfo_Frame::numLocks(frame); arrayOop values = (arrayOop) CiDebugInfo_Frame::values(frame); assert(local_count + expression_count + monitor_count == values->length(), "unexpected values length"); assert(monitor_count == 0, "monitors not supported"); GrowableArray<ScopeValue*>* locals = new GrowableArray<ScopeValue*> (); GrowableArray<ScopeValue*>* expressions = new GrowableArray<ScopeValue*> (); GrowableArray<MonitorValue*>* monitors = new GrowableArray<MonitorValue*> (); for (jint i = 0; i < values->length(); i++) { ScopeValue* value = get_hotspot_value(((oop*) values->base(T_OBJECT))[i]); if (i < local_count) { locals->append(value); } else if (i < local_count + expression_count) { expressions->append(value); } else { ShouldNotReachHere(); // monitors->append(value); } } DebugToken* locals_token = _debug_recorder->create_scope_values(locals); DebugToken* expressions_token = _debug_recorder->create_scope_values(expressions); DebugToken* monitors_token = _debug_recorder->create_monitor_values(monitors); _debug_recorder->describe_scope(pc_offset, cimethod, bci, false, false, false, locals_token, expressions_token, monitors_token); } else { _debug_recorder->describe_scope(pc_offset, cimethod, bci, false, false, false, NULL, NULL, NULL); } } void CodeInstaller::site_Safepoint(CodeBuffer& buffer, jint pc_offset, oop site) { oop debug_info = CiTargetMethod_Safepoint::debugInfo(site); assert(debug_info != NULL, "debug info expected"); // address instruction = _instructions->start() + pc_offset; // jint next_pc_offset = Assembler::locate_next_instruction(instruction) - _instructions->start(); _debug_recorder->add_safepoint(pc_offset, create_oop_map(_frame_size, _parameter_count, debug_info)); oop code_pos = CiDebugInfo::codePos(debug_info); oop frame = CiDebugInfo::frame(debug_info); record_scope(pc_offset, code_pos, frame); _debug_recorder->end_safepoint(pc_offset); } void CodeInstaller::site_Call(CodeBuffer& buffer, jint pc_offset, oop site) { oop runtime_call = CiTargetMethod_Call::runtimeCall(site); oop hotspot_method = CiTargetMethod_Call::method(site); oop symbol = CiTargetMethod_Call::symbol(site); oop global_stub = CiTargetMethod_Call::globalStubID(site); oop debug_info = CiTargetMethod_Call::debugInfo(site); arrayOop stack_map = (arrayOop) CiTargetMethod_Call::stackMap(site); arrayOop register_map = (arrayOop) CiTargetMethod_Call::registerMap(site); assert((runtime_call ? 1 : 0) + (hotspot_method ? 1 : 0) + (symbol ? 1 : 0) + (global_stub ? 1 : 0) == 1, "Call site needs exactly one type"); assert(NativeCall::instruction_size == (int)NativeJump::instruction_size, "unexpected size)"); jint next_pc_offset = pc_offset + NativeCall::instruction_size; if (debug_info != NULL) { _debug_recorder->add_safepoint(next_pc_offset, create_oop_map(_frame_size, _parameter_count, debug_info)); oop code_pos = CiDebugInfo::codePos(debug_info); oop frame = CiDebugInfo::frame(debug_info); record_scope(next_pc_offset, code_pos, frame); } if (runtime_call != NULL) { NativeCall* call = nativeCall_at(_instructions->start() + pc_offset); if (runtime_call == CiRuntimeCall::Debug()) { TRACE_C1X_3("CiRuntimeCall::Debug()"); } else if (runtime_call == CiRuntimeCall::UnwindException()) { call->set_destination(Runtime1::entry_for(Runtime1::c1x_unwind_exception_call_id)); _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand); TRACE_C1X_3("CiRuntimeCall::UnwindException()"); } else if (runtime_call == CiRuntimeCall::HandleException()) { call->set_destination(Runtime1::entry_for(Runtime1::c1x_handle_exception_id)); _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand); TRACE_C1X_3("CiRuntimeCall::HandleException()"); } else if (runtime_call == CiRuntimeCall::JavaTimeMillis()) { call->set_destination((address)os::javaTimeMillis); _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand); TRACE_C1X_3("CiRuntimeCall::JavaTimeMillis()"); } else if (runtime_call == CiRuntimeCall::JavaTimeNanos()) { call->set_destination((address)os::javaTimeNanos); _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand); TRACE_C1X_3("CiRuntimeCall::JavaTimeNanos()"); } else { TRACE_C1X_1("runtime_call not implemented: "); IF_TRACE_C1X_1 runtime_call->print(); } } else if (global_stub != NULL) { NativeInstruction* inst = nativeInstruction_at(_instructions->start() + pc_offset); assert(java_lang_boxing_object::is_instance(global_stub, T_LONG), "global_stub needs to be of type Long"); if (inst->is_call()) { nativeCall_at((address)inst)->set_destination(VmIds::getStub(global_stub)); } else { nativeJump_at((address)inst)->set_jump_destination(VmIds::getStub(global_stub)); } _instructions->relocate((address)inst, runtime_call_Relocation::spec(), Assembler::call32_operand); TRACE_C1X_3("relocating (stub) at %016x", inst); } else if (symbol != NULL) { fatal("symbol"); } else { // method != NULL NativeCall* call = nativeCall_at(_instructions->start() + pc_offset); assert(hotspot_method != NULL, "unexpected RiMethod"); assert(debug_info != NULL, "debug info expected"); methodOop method = NULL; if (hotspot_method->is_a(HotSpotMethodResolved::klass())) method = VmIds::get<methodOop>(HotSpotMethodResolved::vmId(hotspot_method)); assert(debug_info != NULL, "debug info expected"); TRACE_C1X_3("method call"); switch (_next_call_type) { case MARK_INVOKEVIRTUAL: case MARK_INVOKEINTERFACE: { assert(method == NULL || !method->is_static(), "cannot call static method with invokeinterface"); call->set_destination(SharedRuntime::get_resolve_virtual_call_stub()); _instructions->relocate(call->instruction_address(), virtual_call_Relocation::spec(_invoke_mark_pc), Assembler::call32_operand); break; } case MARK_INVOKESTATIC: { assert(method == NULL || method->is_static(), "cannot call non-static method with invokestatic"); call->set_destination(SharedRuntime::get_resolve_static_call_stub()); _instructions->relocate(call->instruction_address(), relocInfo::static_call_type, Assembler::call32_operand); break; } case MARK_INVOKESPECIAL: { assert(method == NULL || !method->is_static(), "cannot call static method with invokespecial"); call->set_destination(SharedRuntime::get_resolve_opt_virtual_call_stub()); _instructions->relocate(call->instruction_address(), relocInfo::opt_virtual_call_type, Assembler::call32_operand); break; } case MARK_INVOKE_INVALID: default: fatal("invalid _next_call_type value") break; } } _next_call_type = MARK_INVOKE_INVALID; if (debug_info != NULL) { _debug_recorder->end_safepoint(next_pc_offset); } } void CodeInstaller::site_DataPatch(CodeBuffer& buffer, jint pc_offset, oop site) { oop constant = CiTargetMethod_DataPatch::constant(site); oop kind = CiConstant::kind(constant); address instruction = _instructions->start() + pc_offset; switch (CiKind::typeChar(kind)) { case 'z': case 'b': case 's': case 'c': case 'i': fatal("int-sized values not expected in DataPatch") ; break; case 'f': case 'l': case 'd': { address operand = Assembler::locate_operand(instruction, Assembler::disp32_operand); address next_instruction = Assembler::locate_next_instruction(instruction); // we don't care if this is a long/double/etc., the primitive field contains the right bits address dest = _constants->end(); *(jlong*) dest = CiConstant::primitive(constant); _constants->set_end(dest + BytesPerLong); long disp = dest - next_instruction; assert(disp == (jint) disp, "disp doesn't fit in 32 bits"); *((jint*) operand) = (jint) disp; _instructions->relocate(instruction, section_word_Relocation::spec((address) dest, CodeBuffer::SECT_CONSTS), Assembler::disp32_operand); TRACE_C1X_3("relocating (Float/Long/Double) at %016x/%016x", instruction, operand); break; } case 'a': { address operand = Assembler::locate_operand(instruction, Assembler::imm_operand); oop obj = CiConstant::object(constant); if (obj->is_a(HotSpotTypeResolved::klass())) { *((jobject*) operand) = JNIHandles::make_local(VmIds::get<klassOop>(HotSpotTypeResolved::vmId(obj))); _instructions->relocate(instruction, oop_Relocation::spec_for_immediate(), Assembler::imm_operand); TRACE_C1X_3("relocating (HotSpotType) at %016x/%016x", instruction, operand); } else { assert(java_lang_boxing_object::is_instance(obj, T_LONG), "unexpected DataPatch object type"); jlong id = obj->long_field(java_lang_boxing_object::value_offset_in_bytes(T_LONG)); assert((id & VmIds::TYPE_MASK) == VmIds::CONSTANT, "unexpected DataPatch type"); address operand = Assembler::locate_operand(instruction, Assembler::imm_operand); if (id == VmIds::DUMMY_CONSTANT) { *((jobject*) operand) = (jobject) Universe::non_oop_word(); } else { *((jobject*) operand) = JNIHandles::make_local(VmIds::get<oop>(id)); } _instructions->relocate(instruction, oop_Relocation::spec_for_immediate(), Assembler::imm_operand); TRACE_C1X_3("relocating (oop constant) at %016x/%016x", instruction, operand); } break; } default: fatal("unexpected CiKind in DataPatch") break; } } void CodeInstaller::site_Mark(CodeBuffer& buffer, jint pc_offset, oop site) { oop id_obj = CiTargetMethod_Mark::id(site); arrayOop references = (arrayOop) CiTargetMethod_Mark::references(site); if (id_obj != NULL) { assert(java_lang_boxing_object::is_instance(id_obj, T_INT), "Integer id expected"); jint id = id_obj->int_field(java_lang_boxing_object::value_offset_in_bytes(T_INT)); address instruction = _instructions->start() + pc_offset; switch (id) { case MARK_UNVERIFIED_ENTRY: _offsets.set_value(CodeOffsets::Entry, pc_offset); break; case MARK_VERIFIED_ENTRY: _offsets.set_value(CodeOffsets::Verified_Entry, pc_offset); break; case MARK_OSR_ENTRY: _offsets.set_value(CodeOffsets::OSR_Entry, pc_offset); break; case MARK_UNWIND_ENTRY: _offsets.set_value(CodeOffsets::UnwindHandler, pc_offset); break; case MARK_EXCEPTION_HANDLER_ENTRY: _offsets.set_value(CodeOffsets::Exceptions, pc_offset); break; case MARK_STATIC_CALL_STUB: { assert(references->length() == 1, "static call stub needs one reference"); oop ref = ((oop*) references->base(T_OBJECT))[0]; address call_pc = _instructions->start() + CiTargetMethod_Site::pcOffset(ref); _instructions->relocate(instruction, static_stub_Relocation::spec(call_pc)); break; } case MARK_INVOKE_INVALID: case MARK_INVOKEINTERFACE: case MARK_INVOKESTATIC: case MARK_INVOKESPECIAL: case MARK_INVOKEVIRTUAL: _next_call_type = (MarkId) id; _invoke_mark_pc = instruction; break; case MARK_IMPLICIT_NULL: _implicit_exception_table.append(pc_offset, pc_offset); break; case MARK_KLASS_PATCHING: case MARK_ACCESS_FIELD_PATCHING: { unsigned char* byte_count = (unsigned char*) (instruction - 1); unsigned char* byte_skip = (unsigned char*) (instruction - 2); unsigned char* being_initialized_entry_offset = (unsigned char*) (instruction - 3); assert(*byte_skip == 5, "unexpected byte_skip"); assert(references->length() == 2, "MARK_KLASS_PATCHING/MARK_ACCESS_FIELD_PATCHING needs 2 references"); oop ref1 = ((oop*) references->base(T_OBJECT))[0]; oop ref2 = ((oop*) references->base(T_OBJECT))[1]; int i_byte_count = CiTargetMethod_Site::pcOffset(ref2) - CiTargetMethod_Site::pcOffset(ref1); assert(i_byte_count == (unsigned char)i_byte_count, "invalid offset"); *byte_count = i_byte_count; *being_initialized_entry_offset = *byte_count + *byte_skip; // we need to correct the offset of a field access - it's created with MAX_INT to ensure the correct size, and hotspot expects 0 if (id == MARK_ACCESS_FIELD_PATCHING) { NativeMovRegMem* inst = nativeMovRegMem_at(_instructions->start() + CiTargetMethod_Site::pcOffset(ref1)); assert(inst->offset() == max_jint, "unexpected offset value"); inst->set_offset(0); } break; } case MARK_DUMMY_OOP_RELOCATION: { _instructions->relocate(instruction, oop_Relocation::spec_for_immediate(), Assembler::imm_operand); RelocIterator iter(_instructions, (address) instruction, (address) (instruction + 1)); relocInfo::change_reloc_info_for_address(&iter, (address) instruction, relocInfo::oop_type, relocInfo::none); break; } default: ShouldNotReachHere() break; } } }