/* * Copyright (c) 2005, 2013, 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 "c1/c1_Compilation.hpp" #include "c1/c1_FrameMap.hpp" #include "c1/c1_Instruction.hpp" #include "c1/c1_LIRAssembler.hpp" #include "c1/c1_LIRGenerator.hpp" #include "c1/c1_ValueStack.hpp" #include "ci/ciArrayKlass.hpp" #include "ci/ciInstance.hpp" #include "ci/ciObjArray.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/stubRoutines.hpp" #include "utilities/bitMap.inline.hpp" #include "utilities/macros.hpp" #if INCLUDE_ALL_GCS #include "gc_implementation/g1/heapRegion.hpp" #endif // INCLUDE_ALL_GCS #ifdef ASSERT #define __ gen()->lir(__FILE__, __LINE__)-> #else #define __ gen()->lir()-> #endif // TODO: ARM - Use some recognizable constant which still fits architectural constraints #ifdef ARM #define PATCHED_ADDR (204) #else #define PATCHED_ADDR (max_jint) #endif void PhiResolverState::reset(int max_vregs) { // Initialize array sizes _virtual_operands.at_put_grow(max_vregs - 1, NULL, NULL); _virtual_operands.trunc_to(0); _other_operands.at_put_grow(max_vregs - 1, NULL, NULL); _other_operands.trunc_to(0); _vreg_table.at_put_grow(max_vregs - 1, NULL, NULL); _vreg_table.trunc_to(0); } //-------------------------------------------------------------- // PhiResolver // Resolves cycles: // // r1 := r2 becomes temp := r1 // r2 := r1 r1 := r2 // r2 := temp // and orders moves: // // r2 := r3 becomes r1 := r2 // r1 := r2 r2 := r3 PhiResolver::PhiResolver(LIRGenerator* gen, int max_vregs) : _gen(gen) , _state(gen->resolver_state()) , _temp(LIR_OprFact::illegalOpr) { // reinitialize the shared state arrays _state.reset(max_vregs); } void PhiResolver::emit_move(LIR_Opr src, LIR_Opr dest) { assert(src->is_valid(), ""); assert(dest->is_valid(), ""); __ move(src, dest); } void PhiResolver::move_temp_to(LIR_Opr dest) { assert(_temp->is_valid(), ""); emit_move(_temp, dest); NOT_PRODUCT(_temp = LIR_OprFact::illegalOpr); } void PhiResolver::move_to_temp(LIR_Opr src) { assert(_temp->is_illegal(), ""); _temp = _gen->new_register(src->type()); emit_move(src, _temp); } // Traverse assignment graph in depth first order and generate moves in post order // ie. two assignments: b := c, a := b start with node c: // Call graph: move(NULL, c) -> move(c, b) -> move(b, a) // Generates moves in this order: move b to a and move c to b // ie. cycle a := b, b := a start with node a // Call graph: move(NULL, a) -> move(a, b) -> move(b, a) // Generates moves in this order: move b to temp, move a to b, move temp to a void PhiResolver::move(ResolveNode* src, ResolveNode* dest) { if (!dest->visited()) { dest->set_visited(); for (int i = dest->no_of_destinations()-1; i >= 0; i --) { move(dest, dest->destination_at(i)); } } else if (!dest->start_node()) { // cylce in graph detected assert(_loop == NULL, "only one loop valid!"); _loop = dest; move_to_temp(src->operand()); return; } // else dest is a start node if (!dest->assigned()) { if (_loop == dest) { move_temp_to(dest->operand()); dest->set_assigned(); } else if (src != NULL) { emit_move(src->operand(), dest->operand()); dest->set_assigned(); } } } PhiResolver::~PhiResolver() { int i; // resolve any cycles in moves from and to virtual registers for (i = virtual_operands().length() - 1; i >= 0; i --) { ResolveNode* node = virtual_operands()[i]; if (!node->visited()) { _loop = NULL; move(NULL, node); node->set_start_node(); assert(_temp->is_illegal(), "move_temp_to() call missing"); } } // generate move for move from non virtual register to abitrary destination for (i = other_operands().length() - 1; i >= 0; i --) { ResolveNode* node = other_operands()[i]; for (int j = node->no_of_destinations() - 1; j >= 0; j --) { emit_move(node->operand(), node->destination_at(j)->operand()); } } } ResolveNode* PhiResolver::create_node(LIR_Opr opr, bool source) { ResolveNode* node; if (opr->is_virtual()) { int vreg_num = opr->vreg_number(); node = vreg_table().at_grow(vreg_num, NULL); assert(node == NULL || node->operand() == opr, ""); if (node == NULL) { node = new ResolveNode(opr); vreg_table()[vreg_num] = node; } // Make sure that all virtual operands show up in the list when // they are used as the source of a move. if (source && !virtual_operands().contains(node)) { virtual_operands().append(node); } } else { assert(source, ""); node = new ResolveNode(opr); other_operands().append(node); } return node; } void PhiResolver::move(LIR_Opr src, LIR_Opr dest) { assert(dest->is_virtual(), ""); // tty->print("move "); src->print(); tty->print(" to "); dest->print(); tty->cr(); assert(src->is_valid(), ""); assert(dest->is_valid(), ""); ResolveNode* source = source_node(src); source->append(destination_node(dest)); } //-------------------------------------------------------------- // LIRItem void LIRItem::set_result(LIR_Opr opr) { assert(value()->operand()->is_illegal() || value()->operand()->is_constant(), "operand should never change"); value()->set_operand(opr); if (opr->is_virtual()) { _gen->_instruction_for_operand.at_put_grow(opr->vreg_number(), value(), NULL); } _result = opr; } void LIRItem::load_item() { if (result()->is_illegal()) { // update the items result _result = value()->operand(); } if (!result()->is_register()) { LIR_Opr reg = _gen->new_register(value()->type()); __ move(result(), reg); if (result()->is_constant()) { _result = reg; } else { set_result(reg); } } } void LIRItem::load_for_store(BasicType type) { if (_gen->can_store_as_constant(value(), type)) { _result = value()->operand(); if (!_result->is_constant()) { _result = LIR_OprFact::value_type(value()->type()); } } else if (type == T_BYTE || type == T_BOOLEAN) { load_byte_item(); } else { load_item(); } } void LIRItem::load_item_force(LIR_Opr reg) { LIR_Opr r = result(); if (r != reg) { #if !defined(ARM) && !defined(E500V2) if (r->type() != reg->type()) { // moves between different types need an intervening spill slot r = _gen->force_to_spill(r, reg->type()); } #endif __ move(r, reg); _result = reg; } } ciObject* LIRItem::get_jobject_constant() const { ObjectType* oc = type()->as_ObjectType(); if (oc) { return oc->constant_value(); } return NULL; } jint LIRItem::get_jint_constant() const { assert(is_constant() && value() != NULL, ""); assert(type()->as_IntConstant() != NULL, "type check"); return type()->as_IntConstant()->value(); } jint LIRItem::get_address_constant() const { assert(is_constant() && value() != NULL, ""); assert(type()->as_AddressConstant() != NULL, "type check"); return type()->as_AddressConstant()->value(); } jfloat LIRItem::get_jfloat_constant() const { assert(is_constant() && value() != NULL, ""); assert(type()->as_FloatConstant() != NULL, "type check"); return type()->as_FloatConstant()->value(); } jdouble LIRItem::get_jdouble_constant() const { assert(is_constant() && value() != NULL, ""); assert(type()->as_DoubleConstant() != NULL, "type check"); return type()->as_DoubleConstant()->value(); } jlong LIRItem::get_jlong_constant() const { assert(is_constant() && value() != NULL, ""); assert(type()->as_LongConstant() != NULL, "type check"); return type()->as_LongConstant()->value(); } //-------------------------------------------------------------- void LIRGenerator::init() { _bs = Universe::heap()->barrier_set(); } void LIRGenerator::block_do_prolog(BlockBegin* block) { #ifndef PRODUCT if (PrintIRWithLIR) { block->print(); } #endif // set up the list of LIR instructions assert(block->lir() == NULL, "LIR list already computed for this block"); _lir = new LIR_List(compilation(), block); block->set_lir(_lir); __ branch_destination(block->label()); if (LIRTraceExecution && Compilation::current()->hir()->start()->block_id() != block->block_id() && !block->is_set(BlockBegin::exception_entry_flag)) { assert(block->lir()->instructions_list()->length() == 1, "should come right after br_dst"); trace_block_entry(block); } } void LIRGenerator::block_do_epilog(BlockBegin* block) { #ifndef PRODUCT if (PrintIRWithLIR) { tty->cr(); } #endif // LIR_Opr for unpinned constants shouldn't be referenced by other // blocks so clear them out after processing the block. for (int i = 0; i < _unpinned_constants.length(); i++) { _unpinned_constants.at(i)->clear_operand(); } _unpinned_constants.trunc_to(0); // clear our any registers for other local constants _constants.trunc_to(0); _reg_for_constants.trunc_to(0); } void LIRGenerator::block_do(BlockBegin* block) { CHECK_BAILOUT(); block_do_prolog(block); set_block(block); for (Instruction* instr = block; instr != NULL; instr = instr->next()) { if (instr->is_pinned()) do_root(instr); } set_block(NULL); block_do_epilog(block); } //-------------------------LIRGenerator----------------------------- // This is where the tree-walk starts; instr must be root; void LIRGenerator::do_root(Value instr) { CHECK_BAILOUT(); InstructionMark im(compilation(), instr); assert(instr->is_pinned(), "use only with roots"); assert(instr->subst() == instr, "shouldn't have missed substitution"); instr->visit(this); assert(!instr->has_uses() || instr->operand()->is_valid() || instr->as_Constant() != NULL || bailed_out(), "invalid item set"); } // This is called for each node in tree; the walk stops if a root is reached void LIRGenerator::walk(Value instr) { InstructionMark im(compilation(), instr); //stop walk when encounter a root if (instr->is_pinned() && instr->as_Phi() == NULL || instr->operand()->is_valid()) { assert(instr->operand() != LIR_OprFact::illegalOpr || instr->as_Constant() != NULL, "this root has not yet been visited"); } else { assert(instr->subst() == instr, "shouldn't have missed substitution"); instr->visit(this); // assert(instr->use_count() > 0 || instr->as_Phi() != NULL, "leaf instruction must have a use"); } } CodeEmitInfo* LIRGenerator::state_for(Instruction* x, ValueStack* state, bool ignore_xhandler) { assert(state != NULL, "state must be defined"); #ifndef PRODUCT state->verify(); #endif ValueStack* s = state; for_each_state(s) { if (s->kind() == ValueStack::EmptyExceptionState) { assert(s->stack_size() == 0 && s->locals_size() == 0 && (s->locks_size() == 0 || s->locks_size() == 1), "state must be empty"); continue; } int index; Value value; for_each_stack_value(s, index, value) { assert(value->subst() == value, "missed substitution"); if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { walk(value); assert(value->operand()->is_valid(), "must be evaluated now"); } } int bci = s->bci(); IRScope* scope = s->scope(); ciMethod* method = scope->method(); MethodLivenessResult liveness = method->liveness_at_bci(bci); if (bci == SynchronizationEntryBCI) { if (x->as_ExceptionObject() || x->as_Throw()) { // all locals are dead on exit from the synthetic unlocker liveness.clear(); } else { assert(x->as_MonitorEnter() || x->as_ProfileInvoke(), "only other cases are MonitorEnter and ProfileInvoke"); } } if (!liveness.is_valid()) { // Degenerate or breakpointed method. bailout("Degenerate or breakpointed method"); } else { assert((int)liveness.size() == s->locals_size(), "error in use of liveness"); for_each_local_value(s, index, value) { assert(value->subst() == value, "missed substition"); if (liveness.at(index) && !value->type()->is_illegal()) { if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { walk(value); assert(value->operand()->is_valid(), "must be evaluated now"); } } else { // NULL out this local so that linear scan can assume that all non-NULL values are live. s->invalidate_local(index); } } } } return new CodeEmitInfo(state, ignore_xhandler ? NULL : x->exception_handlers(), x->check_flag(Instruction::DeoptimizeOnException)); } CodeEmitInfo* LIRGenerator::state_for(Instruction* x) { return state_for(x, x->exception_state()); } void LIRGenerator::klass2reg_with_patching(LIR_Opr r, ciMetadata* obj, CodeEmitInfo* info, bool need_resolve) { /* C2 relies on constant pool entries being resolved (ciTypeFlow), so if TieredCompilation * is active and the class hasn't yet been resolved we need to emit a patch that resolves * the class. */ if ((TieredCompilation && need_resolve) || !obj->is_loaded() || PatchALot) { assert(info != NULL, "info must be set if class is not loaded"); __ klass2reg_patch(NULL, r, info); } else { // no patching needed __ metadata2reg(obj->constant_encoding(), r); } } void LIRGenerator::array_range_check(LIR_Opr array, LIR_Opr index, CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info) { CodeStub* stub = new RangeCheckStub(range_check_info, index); if (index->is_constant()) { cmp_mem_int(lir_cond_belowEqual, array, arrayOopDesc::length_offset_in_bytes(), index->as_jint(), null_check_info); __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch } else { cmp_reg_mem(lir_cond_aboveEqual, index, array, arrayOopDesc::length_offset_in_bytes(), T_INT, null_check_info); __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch } } void LIRGenerator::nio_range_check(LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) { CodeStub* stub = new RangeCheckStub(info, index, true); if (index->is_constant()) { cmp_mem_int(lir_cond_belowEqual, buffer, java_nio_Buffer::limit_offset(), index->as_jint(), info); __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch } else { cmp_reg_mem(lir_cond_aboveEqual, index, buffer, java_nio_Buffer::limit_offset(), T_INT, info); __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch } __ move(index, result); } void LIRGenerator::arithmetic_op(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp_op, CodeEmitInfo* info) { LIR_Opr result_op = result; LIR_Opr left_op = left; LIR_Opr right_op = right; if (TwoOperandLIRForm && left_op != result_op) { assert(right_op != result_op, "malformed"); __ move(left_op, result_op); left_op = result_op; } switch(code) { case Bytecodes::_dadd: case Bytecodes::_fadd: case Bytecodes::_ladd: case Bytecodes::_iadd: __ add(left_op, right_op, result_op); break; case Bytecodes::_fmul: case Bytecodes::_lmul: __ mul(left_op, right_op, result_op); break; case Bytecodes::_dmul: { if (is_strictfp) { __ mul_strictfp(left_op, right_op, result_op, tmp_op); break; } else { __ mul(left_op, right_op, result_op); break; } } break; case Bytecodes::_imul: { bool did_strength_reduce = false; if (right->is_constant()) { int c = right->as_jint(); if (is_power_of_2(c)) { // do not need tmp here __ shift_left(left_op, exact_log2(c), result_op); did_strength_reduce = true; } else { did_strength_reduce = strength_reduce_multiply(left_op, c, result_op, tmp_op); } } // we couldn't strength reduce so just emit the multiply if (!did_strength_reduce) { __ mul(left_op, right_op, result_op); } } break; case Bytecodes::_dsub: case Bytecodes::_fsub: case Bytecodes::_lsub: case Bytecodes::_isub: __ sub(left_op, right_op, result_op); break; case Bytecodes::_fdiv: __ div (left_op, right_op, result_op); break; // ldiv and lrem are implemented with a direct runtime call case Bytecodes::_ddiv: { if (is_strictfp) { __ div_strictfp (left_op, right_op, result_op, tmp_op); break; } else { __ div (left_op, right_op, result_op); break; } } break; case Bytecodes::_drem: case Bytecodes::_frem: __ rem (left_op, right_op, result_op); break; default: ShouldNotReachHere(); } } void LIRGenerator::arithmetic_op_int(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp) { arithmetic_op(code, result, left, right, false, tmp); } void LIRGenerator::arithmetic_op_long(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) { arithmetic_op(code, result, left, right, false, LIR_OprFact::illegalOpr, info); } void LIRGenerator::arithmetic_op_fpu(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp) { arithmetic_op(code, result, left, right, is_strictfp, tmp); } void LIRGenerator::shift_op(Bytecodes::Code code, LIR_Opr result_op, LIR_Opr value, LIR_Opr count, LIR_Opr tmp) { if (TwoOperandLIRForm && value != result_op) { assert(count != result_op, "malformed"); __ move(value, result_op); value = result_op; } assert(count->is_constant() || count->is_register(), "must be"); switch(code) { case Bytecodes::_ishl: case Bytecodes::_lshl: __ shift_left(value, count, result_op, tmp); break; case Bytecodes::_ishr: case Bytecodes::_lshr: __ shift_right(value, count, result_op, tmp); break; case Bytecodes::_iushr: case Bytecodes::_lushr: __ unsigned_shift_right(value, count, result_op, tmp); break; default: ShouldNotReachHere(); } } void LIRGenerator::logic_op (Bytecodes::Code code, LIR_Opr result_op, LIR_Opr left_op, LIR_Opr right_op) { if (TwoOperandLIRForm && left_op != result_op) { assert(right_op != result_op, "malformed"); __ move(left_op, result_op); left_op = result_op; } switch(code) { case Bytecodes::_iand: case Bytecodes::_land: __ logical_and(left_op, right_op, result_op); break; case Bytecodes::_ior: case Bytecodes::_lor: __ logical_or(left_op, right_op, result_op); break; case Bytecodes::_ixor: case Bytecodes::_lxor: __ logical_xor(left_op, right_op, result_op); break; default: ShouldNotReachHere(); } } void LIRGenerator::monitor_enter(LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no, CodeEmitInfo* info_for_exception, CodeEmitInfo* info) { if (!GenerateSynchronizationCode) return; // for slow path, use debug info for state after successful locking CodeStub* slow_path = new MonitorEnterStub(object, lock, info); __ load_stack_address_monitor(monitor_no, lock); // for handling NullPointerException, use debug info representing just the lock stack before this monitorenter __ lock_object(hdr, object, lock, scratch, slow_path, info_for_exception); } void LIRGenerator::monitor_exit(LIR_Opr object, LIR_Opr lock, LIR_Opr new_hdr, LIR_Opr scratch, int monitor_no) { if (!GenerateSynchronizationCode) return; // setup registers LIR_Opr hdr = lock; lock = new_hdr; CodeStub* slow_path = new MonitorExitStub(lock, UseFastLocking, monitor_no); __ load_stack_address_monitor(monitor_no, lock); __ unlock_object(hdr, object, lock, scratch, slow_path); } #ifndef PRODUCT void LIRGenerator::print_if_not_loaded(const NewInstance* new_instance) { if (PrintNotLoaded && !new_instance->klass()->is_loaded()) { tty->print_cr(" ###class not loaded at new bci %d", new_instance->printable_bci()); } else if (PrintNotLoaded && (TieredCompilation && new_instance->is_unresolved())) { tty->print_cr(" ###class not resolved at new bci %d", new_instance->printable_bci()); } } #endif void LIRGenerator::new_instance(LIR_Opr dst, ciInstanceKlass* klass, bool is_unresolved, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr scratch3, LIR_Opr scratch4, LIR_Opr klass_reg, CodeEmitInfo* info) { klass2reg_with_patching(klass_reg, klass, info, is_unresolved); // If klass is not loaded we do not know if the klass has finalizers: if (UseFastNewInstance && klass->is_loaded() && !Klass::layout_helper_needs_slow_path(klass->layout_helper())) { Runtime1::StubID stub_id = klass->is_initialized() ? Runtime1::fast_new_instance_id : Runtime1::fast_new_instance_init_check_id; CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, stub_id); assert(klass->is_loaded(), "must be loaded"); // allocate space for instance assert(klass->size_helper() >= 0, "illegal instance size"); const int instance_size = align_object_size(klass->size_helper()); __ allocate_object(dst, scratch1, scratch2, scratch3, scratch4, oopDesc::header_size(), instance_size, klass_reg, !klass->is_initialized(), slow_path); } else { CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, Runtime1::new_instance_id); __ branch(lir_cond_always, T_ILLEGAL, slow_path); __ branch_destination(slow_path->continuation()); } } static bool is_constant_zero(Instruction* inst) { IntConstant* c = inst->type()->as_IntConstant(); if (c) { return (c->value() == 0); } return false; } static bool positive_constant(Instruction* inst) { IntConstant* c = inst->type()->as_IntConstant(); if (c) { return (c->value() >= 0); } return false; } static ciArrayKlass* as_array_klass(ciType* type) { if (type != NULL && type->is_array_klass() && type->is_loaded()) { return (ciArrayKlass*)type; } else { return NULL; } } static ciType* phi_declared_type(Phi* phi) { ciType* t = phi->operand_at(0)->declared_type(); if (t == NULL) { return NULL; } for(int i = 1; i < phi->operand_count(); i++) { if (t != phi->operand_at(i)->declared_type()) { return NULL; } } return t; } void LIRGenerator::arraycopy_helper(Intrinsic* x, int* flagsp, ciArrayKlass** expected_typep) { Instruction* src = x->argument_at(0); Instruction* src_pos = x->argument_at(1); Instruction* dst = x->argument_at(2); Instruction* dst_pos = x->argument_at(3); Instruction* length = x->argument_at(4); // first try to identify the likely type of the arrays involved ciArrayKlass* expected_type = NULL; bool is_exact = false, src_objarray = false, dst_objarray = false; { ciArrayKlass* src_exact_type = as_array_klass(src->exact_type()); ciArrayKlass* src_declared_type = as_array_klass(src->declared_type()); Phi* phi; if (src_declared_type == NULL && (phi = src->as_Phi()) != NULL) { src_declared_type = as_array_klass(phi_declared_type(phi)); } ciArrayKlass* dst_exact_type = as_array_klass(dst->exact_type()); ciArrayKlass* dst_declared_type = as_array_klass(dst->declared_type()); if (dst_declared_type == NULL && (phi = dst->as_Phi()) != NULL) { dst_declared_type = as_array_klass(phi_declared_type(phi)); } if (src_exact_type != NULL && src_exact_type == dst_exact_type) { // the types exactly match so the type is fully known is_exact = true; expected_type = src_exact_type; } else if (dst_exact_type != NULL && dst_exact_type->is_obj_array_klass()) { ciArrayKlass* dst_type = (ciArrayKlass*) dst_exact_type; ciArrayKlass* src_type = NULL; if (src_exact_type != NULL && src_exact_type->is_obj_array_klass()) { src_type = (ciArrayKlass*) src_exact_type; } else if (src_declared_type != NULL && src_declared_type->is_obj_array_klass()) { src_type = (ciArrayKlass*) src_declared_type; } if (src_type != NULL) { if (src_type->element_type()->is_subtype_of(dst_type->element_type())) { is_exact = true; expected_type = dst_type; } } } // at least pass along a good guess if (expected_type == NULL) expected_type = dst_exact_type; if (expected_type == NULL) expected_type = src_declared_type; if (expected_type == NULL) expected_type = dst_declared_type; src_objarray = (src_exact_type && src_exact_type->is_obj_array_klass()) || (src_declared_type && src_declared_type->is_obj_array_klass()); dst_objarray = (dst_exact_type && dst_exact_type->is_obj_array_klass()) || (dst_declared_type && dst_declared_type->is_obj_array_klass()); } // if a probable array type has been identified, figure out if any // of the required checks for a fast case can be elided. int flags = LIR_OpArrayCopy::all_flags; if (!src_objarray) flags &= ~LIR_OpArrayCopy::src_objarray; if (!dst_objarray) flags &= ~LIR_OpArrayCopy::dst_objarray; if (!x->arg_needs_null_check(0)) flags &= ~LIR_OpArrayCopy::src_null_check; if (!x->arg_needs_null_check(2)) flags &= ~LIR_OpArrayCopy::dst_null_check; if (expected_type != NULL) { Value length_limit = NULL; IfOp* ifop = length->as_IfOp(); if (ifop != NULL) { // look for expressions like min(v, a.length) which ends up as // x > y ? y : x or x >= y ? y : x if ((ifop->cond() == If::gtr || ifop->cond() == If::geq) && ifop->x() == ifop->fval() && ifop->y() == ifop->tval()) { length_limit = ifop->y(); } } // try to skip null checks and range checks NewArray* src_array = src->as_NewArray(); if (src_array != NULL) { flags &= ~LIR_OpArrayCopy::src_null_check; if (length_limit != NULL && src_array->length() == length_limit && is_constant_zero(src_pos)) { flags &= ~LIR_OpArrayCopy::src_range_check; } } NewArray* dst_array = dst->as_NewArray(); if (dst_array != NULL) { flags &= ~LIR_OpArrayCopy::dst_null_check; if (length_limit != NULL && dst_array->length() == length_limit && is_constant_zero(dst_pos)) { flags &= ~LIR_OpArrayCopy::dst_range_check; } } // check from incoming constant values if (positive_constant(src_pos)) flags &= ~LIR_OpArrayCopy::src_pos_positive_check; if (positive_constant(dst_pos)) flags &= ~LIR_OpArrayCopy::dst_pos_positive_check; if (positive_constant(length)) flags &= ~LIR_OpArrayCopy::length_positive_check; // see if the range check can be elided, which might also imply // that src or dst is non-null. ArrayLength* al = length->as_ArrayLength(); if (al != NULL) { if (al->array() == src) { // it's the length of the source array flags &= ~LIR_OpArrayCopy::length_positive_check; flags &= ~LIR_OpArrayCopy::src_null_check; if (is_constant_zero(src_pos)) flags &= ~LIR_OpArrayCopy::src_range_check; } if (al->array() == dst) { // it's the length of the destination array flags &= ~LIR_OpArrayCopy::length_positive_check; flags &= ~LIR_OpArrayCopy::dst_null_check; if (is_constant_zero(dst_pos)) flags &= ~LIR_OpArrayCopy::dst_range_check; } } if (is_exact) { flags &= ~LIR_OpArrayCopy::type_check; } } IntConstant* src_int = src_pos->type()->as_IntConstant(); IntConstant* dst_int = dst_pos->type()->as_IntConstant(); if (src_int && dst_int) { int s_offs = src_int->value(); int d_offs = dst_int->value(); if (src_int->value() >= dst_int->value()) { flags &= ~LIR_OpArrayCopy::overlapping; } if (expected_type != NULL) { BasicType t = expected_type->element_type()->basic_type(); int element_size = type2aelembytes(t); if (((arrayOopDesc::base_offset_in_bytes(t) + s_offs * element_size) % HeapWordSize == 0) && ((arrayOopDesc::base_offset_in_bytes(t) + d_offs * element_size) % HeapWordSize == 0)) { flags &= ~LIR_OpArrayCopy::unaligned; } } } else if (src_pos == dst_pos || is_constant_zero(dst_pos)) { // src and dest positions are the same, or dst is zero so assume // nonoverlapping copy. flags &= ~LIR_OpArrayCopy::overlapping; } if (src == dst) { // moving within a single array so no type checks are needed if (flags & LIR_OpArrayCopy::type_check) { flags &= ~LIR_OpArrayCopy::type_check; } } *flagsp = flags; *expected_typep = (ciArrayKlass*)expected_type; } LIR_Opr LIRGenerator::round_item(LIR_Opr opr) { assert(opr->is_register(), "why spill if item is not register?"); if (RoundFPResults && UseSSE < 1 && opr->is_single_fpu()) { LIR_Opr result = new_register(T_FLOAT); set_vreg_flag(result, must_start_in_memory); assert(opr->is_register(), "only a register can be spilled"); assert(opr->value_type()->is_float(), "rounding only for floats available"); __ roundfp(opr, LIR_OprFact::illegalOpr, result); return result; } return opr; } LIR_Opr LIRGenerator::force_to_spill(LIR_Opr value, BasicType t) { assert(type2size[t] == type2size[value->type()], err_msg_res("size mismatch: t=%s, value->type()=%s", type2name(t), type2name(value->type()))); if (!value->is_register()) { // force into a register LIR_Opr r = new_register(value->type()); __ move(value, r); value = r; } // create a spill location LIR_Opr tmp = new_register(t); set_vreg_flag(tmp, LIRGenerator::must_start_in_memory); // move from register to spill __ move(value, tmp); return tmp; } void LIRGenerator::profile_branch(If* if_instr, If::Condition cond) { if (if_instr->should_profile()) { ciMethod* method = if_instr->profiled_method(); assert(method != NULL, "method should be set if branch is profiled"); ciMethodData* md = method->method_data_or_null(); assert(md != NULL, "Sanity"); ciProfileData* data = md->bci_to_data(if_instr->profiled_bci()); assert(data != NULL, "must have profiling data"); assert(data->is_BranchData(), "need BranchData for two-way branches"); int taken_count_offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); int not_taken_count_offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); if (if_instr->is_swapped()) { int t = taken_count_offset; taken_count_offset = not_taken_count_offset; not_taken_count_offset = t; } LIR_Opr md_reg = new_register(T_METADATA); __ metadata2reg(md->constant_encoding(), md_reg); LIR_Opr data_offset_reg = new_pointer_register(); __ cmove(lir_cond(cond), LIR_OprFact::intptrConst(taken_count_offset), LIR_OprFact::intptrConst(not_taken_count_offset), data_offset_reg, as_BasicType(if_instr->x()->type())); // MDO cells are intptr_t, so the data_reg width is arch-dependent. LIR_Opr data_reg = new_pointer_register(); LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); __ move(data_addr, data_reg); // Use leal instead of add to avoid destroying condition codes on x86 LIR_Address* fake_incr_value = new LIR_Address(data_reg, DataLayout::counter_increment, T_INT); __ leal(LIR_OprFact::address(fake_incr_value), data_reg); __ move(data_reg, data_addr); } } // Phi technique: // This is about passing live values from one basic block to the other. // In code generated with Java it is rather rare that more than one // value is on the stack from one basic block to the other. // We optimize our technique for efficient passing of one value // (of type long, int, double..) but it can be extended. // When entering or leaving a basic block, all registers and all spill // slots are release and empty. We use the released registers // and spill slots to pass the live values from one block // to the other. The topmost value, i.e., the value on TOS of expression // stack is passed in registers. All other values are stored in spilling // area. Every Phi has an index which designates its spill slot // At exit of a basic block, we fill the register(s) and spill slots. // At entry of a basic block, the block_prolog sets up the content of phi nodes // and locks necessary registers and spilling slots. // move current value to referenced phi function void LIRGenerator::move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val) { Phi* phi = sux_val->as_Phi(); // cur_val can be null without phi being null in conjunction with inlining if (phi != NULL && cur_val != NULL && cur_val != phi && !phi->is_illegal()) { LIR_Opr operand = cur_val->operand(); if (cur_val->operand()->is_illegal()) { assert(cur_val->as_Constant() != NULL || cur_val->as_Local() != NULL, "these can be produced lazily"); operand = operand_for_instruction(cur_val); } resolver->move(operand, operand_for_instruction(phi)); } } // Moves all stack values into their PHI position void LIRGenerator::move_to_phi(ValueStack* cur_state) { BlockBegin* bb = block(); if (bb->number_of_sux() == 1) { BlockBegin* sux = bb->sux_at(0); assert(sux->number_of_preds() > 0, "invalid CFG"); // a block with only one predecessor never has phi functions if (sux->number_of_preds() > 1) { int max_phis = cur_state->stack_size() + cur_state->locals_size(); PhiResolver resolver(this, _virtual_register_number + max_phis * 2); ValueStack* sux_state = sux->state(); Value sux_value; int index; assert(cur_state->scope() == sux_state->scope(), "not matching"); assert(cur_state->locals_size() == sux_state->locals_size(), "not matching"); assert(cur_state->stack_size() == sux_state->stack_size(), "not matching"); for_each_stack_value(sux_state, index, sux_value) { move_to_phi(&resolver, cur_state->stack_at(index), sux_value); } for_each_local_value(sux_state, index, sux_value) { move_to_phi(&resolver, cur_state->local_at(index), sux_value); } assert(cur_state->caller_state() == sux_state->caller_state(), "caller states must be equal"); } } } LIR_Opr LIRGenerator::new_register(BasicType type) { int vreg = _virtual_register_number; // add a little fudge factor for the bailout, since the bailout is // only checked periodically. This gives a few extra registers to // hand out before we really run out, which helps us keep from // tripping over assertions. if (vreg + 20 >= LIR_OprDesc::vreg_max) { bailout("out of virtual registers"); if (vreg + 2 >= LIR_OprDesc::vreg_max) { // wrap it around _virtual_register_number = LIR_OprDesc::vreg_base; } } _virtual_register_number += 1; return LIR_OprFact::virtual_register(vreg, type); } // Try to lock using register in hint LIR_Opr LIRGenerator::rlock(Value instr) { return new_register(instr->type()); } // does an rlock and sets result LIR_Opr LIRGenerator::rlock_result(Value x) { LIR_Opr reg = rlock(x); set_result(x, reg); return reg; } // does an rlock and sets result LIR_Opr LIRGenerator::rlock_result(Value x, BasicType type) { LIR_Opr reg; switch (type) { case T_BYTE: case T_BOOLEAN: reg = rlock_byte(type); break; default: reg = rlock(x); break; } set_result(x, reg); return reg; } //--------------------------------------------------------------------- ciObject* LIRGenerator::get_jobject_constant(Value value) { ObjectType* oc = value->type()->as_ObjectType(); if (oc) { return oc->constant_value(); } return NULL; } void LIRGenerator::do_ExceptionObject(ExceptionObject* x) { assert(block()->is_set(BlockBegin::exception_entry_flag), "ExceptionObject only allowed in exception handler block"); assert(block()->next() == x, "ExceptionObject must be first instruction of block"); // no moves are created for phi functions at the begin of exception // handlers, so assign operands manually here for_each_phi_fun(block(), phi, operand_for_instruction(phi)); LIR_Opr thread_reg = getThreadPointer(); __ move_wide(new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT), exceptionOopOpr()); __ move_wide(LIR_OprFact::oopConst(NULL), new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT)); __ move_wide(LIR_OprFact::oopConst(NULL), new LIR_Address(thread_reg, in_bytes(JavaThread::exception_pc_offset()), T_OBJECT)); LIR_Opr result = new_register(T_OBJECT); __ move(exceptionOopOpr(), result); set_result(x, result); } //---------------------------------------------------------------------- //---------------------------------------------------------------------- //---------------------------------------------------------------------- //---------------------------------------------------------------------- // visitor functions //---------------------------------------------------------------------- //---------------------------------------------------------------------- //---------------------------------------------------------------------- //---------------------------------------------------------------------- void LIRGenerator::do_Phi(Phi* x) { // phi functions are never visited directly ShouldNotReachHere(); } // Code for a constant is generated lazily unless the constant is frequently used and can't be inlined. void LIRGenerator::do_Constant(Constant* x) { if (x->state_before() != NULL) { // Any constant with a ValueStack requires patching so emit the patch here LIR_Opr reg = rlock_result(x); CodeEmitInfo* info = state_for(x, x->state_before()); __ oop2reg_patch(NULL, reg, info); } else if (x->use_count() > 1 && !can_inline_as_constant(x)) { if (!x->is_pinned()) { // unpinned constants are handled specially so that they can be // put into registers when they are used multiple times within a // block. After the block completes their operand will be // cleared so that other blocks can't refer to that register. set_result(x, load_constant(x)); } else { LIR_Opr res = x->operand(); if (!res->is_valid()) { res = LIR_OprFact::value_type(x->type()); } if (res->is_constant()) { LIR_Opr reg = rlock_result(x); __ move(res, reg); } else { set_result(x, res); } } } else { set_result(x, LIR_OprFact::value_type(x->type())); } } void LIRGenerator::do_Local(Local* x) { // operand_for_instruction has the side effect of setting the result // so there's no need to do it here. operand_for_instruction(x); } void LIRGenerator::do_IfInstanceOf(IfInstanceOf* x) { Unimplemented(); } void LIRGenerator::do_Return(Return* x) { if (compilation()->env()->dtrace_method_probes()) { BasicTypeList signature; signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread signature.append(T_METADATA); // Method* LIR_OprList* args = new LIR_OprList(); args->append(getThreadPointer()); LIR_Opr meth = new_register(T_METADATA); __ metadata2reg(method()->constant_encoding(), meth); args->append(meth); call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL); } if (x->type()->is_void()) { __ return_op(LIR_OprFact::illegalOpr); } else { LIR_Opr reg = result_register_for(x->type(), /*callee=*/true); LIRItem result(x->result(), this); result.load_item_force(reg); __ return_op(result.result()); } set_no_result(x); } // Examble: ref.get() // Combination of LoadField and g1 pre-write barrier void LIRGenerator::do_Reference_get(Intrinsic* x) { const int referent_offset = java_lang_ref_Reference::referent_offset; guarantee(referent_offset > 0, "referent offset not initialized"); assert(x->number_of_arguments() == 1, "wrong type"); LIRItem reference(x->argument_at(0), this); reference.load_item(); // need to perform the null check on the reference objecy CodeEmitInfo* info = NULL; if (x->needs_null_check()) { info = state_for(x); } LIR_Address* referent_field_adr = new LIR_Address(reference.result(), referent_offset, T_OBJECT); LIR_Opr result = rlock_result(x); __ load(referent_field_adr, result, info); // Register the value in the referent field with the pre-barrier pre_barrier(LIR_OprFact::illegalOpr /* addr_opr */, result /* pre_val */, false /* do_load */, false /* patch */, NULL /* info */); } // Example: clazz.isInstance(object) void LIRGenerator::do_isInstance(Intrinsic* x) { assert(x->number_of_arguments() == 2, "wrong type"); // TODO could try to substitute this node with an equivalent InstanceOf // if clazz is known to be a constant Class. This will pick up newly found // constants after HIR construction. I'll leave this to a future change. // as a first cut, make a simple leaf call to runtime to stay platform independent. // could follow the aastore example in a future change. LIRItem clazz(x->argument_at(0), this); LIRItem object(x->argument_at(1), this); clazz.load_item(); object.load_item(); LIR_Opr result = rlock_result(x); // need to perform null check on clazz if (x->needs_null_check()) { CodeEmitInfo* info = state_for(x); __ null_check(clazz.result(), info); } LIR_Opr call_result = call_runtime(clazz.value(), object.value(), CAST_FROM_FN_PTR(address, Runtime1::is_instance_of), x->type(), NULL); // NULL CodeEmitInfo results in a leaf call __ move(call_result, result); } // Example: object.getClass () void LIRGenerator::do_getClass(Intrinsic* x) { assert(x->number_of_arguments() == 1, "wrong type"); LIRItem rcvr(x->argument_at(0), this); rcvr.load_item(); LIR_Opr temp = new_register(T_METADATA); LIR_Opr result = rlock_result(x); // need to perform the null check on the rcvr CodeEmitInfo* info = NULL; if (x->needs_null_check()) { info = state_for(x); } // FIXME T_ADDRESS should actually be T_METADATA but it can't because the // meaning of these two is mixed up (see JDK-8026837). __ move(new LIR_Address(rcvr.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), temp, info); __ move_wide(new LIR_Address(temp, in_bytes(Klass::java_mirror_offset()), T_OBJECT), result); } // Example: Thread.currentThread() void LIRGenerator::do_currentThread(Intrinsic* x) { assert(x->number_of_arguments() == 0, "wrong type"); LIR_Opr reg = rlock_result(x); __ move_wide(new LIR_Address(getThreadPointer(), in_bytes(JavaThread::threadObj_offset()), T_OBJECT), reg); } void LIRGenerator::do_RegisterFinalizer(Intrinsic* x) { assert(x->number_of_arguments() == 1, "wrong type"); LIRItem receiver(x->argument_at(0), this); receiver.load_item(); BasicTypeList signature; signature.append(T_OBJECT); // receiver LIR_OprList* args = new LIR_OprList(); args->append(receiver.result()); CodeEmitInfo* info = state_for(x, x->state()); call_runtime(&signature, args, CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::register_finalizer_id)), voidType, info); set_no_result(x); } //------------------------local access-------------------------------------- LIR_Opr LIRGenerator::operand_for_instruction(Instruction* x) { if (x->operand()->is_illegal()) { Constant* c = x->as_Constant(); if (c != NULL) { x->set_operand(LIR_OprFact::value_type(c->type())); } else { assert(x->as_Phi() || x->as_Local() != NULL, "only for Phi and Local"); // allocate a virtual register for this local or phi x->set_operand(rlock(x)); _instruction_for_operand.at_put_grow(x->operand()->vreg_number(), x, NULL); } } return x->operand(); } Instruction* LIRGenerator::instruction_for_opr(LIR_Opr opr) { if (opr->is_virtual()) { return instruction_for_vreg(opr->vreg_number()); } return NULL; } Instruction* LIRGenerator::instruction_for_vreg(int reg_num) { if (reg_num < _instruction_for_operand.length()) { return _instruction_for_operand.at(reg_num); } return NULL; } void LIRGenerator::set_vreg_flag(int vreg_num, VregFlag f) { if (_vreg_flags.size_in_bits() == 0) { BitMap2D temp(100, num_vreg_flags); temp.clear(); _vreg_flags = temp; } _vreg_flags.at_put_grow(vreg_num, f, true); } bool LIRGenerator::is_vreg_flag_set(int vreg_num, VregFlag f) { if (!_vreg_flags.is_valid_index(vreg_num, f)) { return false; } return _vreg_flags.at(vreg_num, f); } // Block local constant handling. This code is useful for keeping // unpinned constants and constants which aren't exposed in the IR in // registers. Unpinned Constant instructions have their operands // cleared when the block is finished so that other blocks can't end // up referring to their registers. LIR_Opr LIRGenerator::load_constant(Constant* x) { assert(!x->is_pinned(), "only for unpinned constants"); _unpinned_constants.append(x); return load_constant(LIR_OprFact::value_type(x->type())->as_constant_ptr()); } LIR_Opr LIRGenerator::load_constant(LIR_Const* c) { BasicType t = c->type(); for (int i = 0; i < _constants.length(); i++) { LIR_Const* other = _constants.at(i); if (t == other->type()) { switch (t) { case T_INT: case T_FLOAT: if (c->as_jint_bits() != other->as_jint_bits()) continue; break; case T_LONG: case T_DOUBLE: if (c->as_jint_hi_bits() != other->as_jint_hi_bits()) continue; if (c->as_jint_lo_bits() != other->as_jint_lo_bits()) continue; break; case T_OBJECT: if (c->as_jobject() != other->as_jobject()) continue; break; } return _reg_for_constants.at(i); } } LIR_Opr result = new_register(t); __ move((LIR_Opr)c, result); _constants.append(c); _reg_for_constants.append(result); return result; } // Various barriers void LIRGenerator::pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val, bool do_load, bool patch, CodeEmitInfo* info) { // Do the pre-write barrier, if any. switch (_bs->kind()) { #if INCLUDE_ALL_GCS case BarrierSet::G1SATBCT: case BarrierSet::G1SATBCTLogging: G1SATBCardTableModRef_pre_barrier(addr_opr, pre_val, do_load, patch, info); break; #endif // INCLUDE_ALL_GCS case BarrierSet::CardTableModRef: case BarrierSet::CardTableExtension: // No pre barriers break; case BarrierSet::ModRef: case BarrierSet::Other: // No pre barriers break; default : ShouldNotReachHere(); } } void LIRGenerator::post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { switch (_bs->kind()) { #if INCLUDE_ALL_GCS case BarrierSet::G1SATBCT: case BarrierSet::G1SATBCTLogging: G1SATBCardTableModRef_post_barrier(addr, new_val); break; #endif // INCLUDE_ALL_GCS case BarrierSet::CardTableModRef: case BarrierSet::CardTableExtension: CardTableModRef_post_barrier(addr, new_val); break; case BarrierSet::ModRef: case BarrierSet::Other: // No post barriers break; default : ShouldNotReachHere(); } } //////////////////////////////////////////////////////////////////////// #if INCLUDE_ALL_GCS void LIRGenerator::G1SATBCardTableModRef_pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val, bool do_load, bool patch, CodeEmitInfo* info) { // First we test whether marking is in progress. BasicType flag_type; if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { flag_type = T_INT; } else { guarantee(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption"); flag_type = T_BYTE; } LIR_Opr thrd = getThreadPointer(); LIR_Address* mark_active_flag_addr = new LIR_Address(thrd, in_bytes(JavaThread::satb_mark_queue_offset() + PtrQueue::byte_offset_of_active()), flag_type); // Read the marking-in-progress flag. LIR_Opr flag_val = new_register(T_INT); __ load(mark_active_flag_addr, flag_val); __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0)); LIR_PatchCode pre_val_patch_code = lir_patch_none; CodeStub* slow; if (do_load) { assert(pre_val == LIR_OprFact::illegalOpr, "sanity"); assert(addr_opr != LIR_OprFact::illegalOpr, "sanity"); if (patch) pre_val_patch_code = lir_patch_normal; pre_val = new_register(T_OBJECT); if (!addr_opr->is_address()) { assert(addr_opr->is_register(), "must be"); addr_opr = LIR_OprFact::address(new LIR_Address(addr_opr, T_OBJECT)); } slow = new G1PreBarrierStub(addr_opr, pre_val, pre_val_patch_code, info); } else { assert(addr_opr == LIR_OprFact::illegalOpr, "sanity"); assert(pre_val->is_register(), "must be"); assert(pre_val->type() == T_OBJECT, "must be an object"); assert(info == NULL, "sanity"); slow = new G1PreBarrierStub(pre_val); } __ branch(lir_cond_notEqual, T_INT, slow); __ branch_destination(slow->continuation()); } void LIRGenerator::G1SATBCardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { // If the "new_val" is a constant NULL, no barrier is necessary. if (new_val->is_constant() && new_val->as_constant_ptr()->as_jobject() == NULL) return; if (!new_val->is_register()) { LIR_Opr new_val_reg = new_register(T_OBJECT); if (new_val->is_constant()) { __ move(new_val, new_val_reg); } else { __ leal(new_val, new_val_reg); } new_val = new_val_reg; } assert(new_val->is_register(), "must be a register at this point"); if (addr->is_address()) { LIR_Address* address = addr->as_address_ptr(); LIR_Opr ptr = new_pointer_register(); if (!address->index()->is_valid() && address->disp() == 0) { __ move(address->base(), ptr); } else { assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); __ leal(addr, ptr); } addr = ptr; } assert(addr->is_register(), "must be a register at this point"); LIR_Opr xor_res = new_pointer_register(); LIR_Opr xor_shift_res = new_pointer_register(); if (TwoOperandLIRForm ) { __ move(addr, xor_res); __ logical_xor(xor_res, new_val, xor_res); __ move(xor_res, xor_shift_res); __ unsigned_shift_right(xor_shift_res, LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes), xor_shift_res, LIR_OprDesc::illegalOpr()); } else { __ logical_xor(addr, new_val, xor_res); __ unsigned_shift_right(xor_res, LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes), xor_shift_res, LIR_OprDesc::illegalOpr()); } if (!new_val->is_register()) { LIR_Opr new_val_reg = new_register(T_OBJECT); __ leal(new_val, new_val_reg); new_val = new_val_reg; } assert(new_val->is_register(), "must be a register at this point"); __ cmp(lir_cond_notEqual, xor_shift_res, LIR_OprFact::intptrConst(NULL_WORD)); CodeStub* slow = new G1PostBarrierStub(addr, new_val); __ branch(lir_cond_notEqual, LP64_ONLY(T_LONG) NOT_LP64(T_INT), slow); __ branch_destination(slow->continuation()); } #endif // INCLUDE_ALL_GCS //////////////////////////////////////////////////////////////////////// void LIRGenerator::CardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { assert(sizeof(*((CardTableModRefBS*)_bs)->byte_map_base) == sizeof(jbyte), "adjust this code"); LIR_Const* card_table_base = new LIR_Const(((CardTableModRefBS*)_bs)->byte_map_base); if (addr->is_address()) { LIR_Address* address = addr->as_address_ptr(); // ptr cannot be an object because we use this barrier for array card marks // and addr can point in the middle of an array. LIR_Opr ptr = new_pointer_register(); if (!address->index()->is_valid() && address->disp() == 0) { __ move(address->base(), ptr); } else { assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); __ leal(addr, ptr); } addr = ptr; } assert(addr->is_register(), "must be a register at this point"); #ifdef ARM // TODO: ARM - move to platform-dependent code LIR_Opr tmp = FrameMap::R14_opr; if (VM_Version::supports_movw()) { __ move((LIR_Opr)card_table_base, tmp); } else { __ move(new LIR_Address(FrameMap::Rthread_opr, in_bytes(JavaThread::card_table_base_offset()), T_ADDRESS), tmp); } CardTableModRefBS* ct = (CardTableModRefBS*)_bs; LIR_Address *card_addr = new LIR_Address(tmp, addr, (LIR_Address::Scale) -CardTableModRefBS::card_shift, 0, T_BYTE); if(((int)ct->byte_map_base & 0xff) == 0) { __ move(tmp, card_addr); } else { LIR_Opr tmp_zero = new_register(T_INT); __ move(LIR_OprFact::intConst(0), tmp_zero); __ move(tmp_zero, card_addr); } #else // ARM LIR_Opr tmp = new_pointer_register(); if (TwoOperandLIRForm) { __ move(addr, tmp); __ unsigned_shift_right(tmp, CardTableModRefBS::card_shift, tmp); } else { __ unsigned_shift_right(addr, CardTableModRefBS::card_shift, tmp); } if (can_inline_as_constant(card_table_base)) { __ move(LIR_OprFact::intConst(0), new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE)); } else { __ move(LIR_OprFact::intConst(0), new LIR_Address(tmp, load_constant(card_table_base), T_BYTE)); } #endif // ARM } //------------------------field access-------------------------------------- // Comment copied form templateTable_i486.cpp // ---------------------------------------------------------------------------- // Volatile variables demand their effects be made known to all CPU's in // order. Store buffers on most chips allow reads & writes to reorder; the // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of // memory barrier (i.e., it's not sufficient that the interpreter does not // reorder volatile references, the hardware also must not reorder them). // // According to the new Java Memory Model (JMM): // (1) All volatiles are serialized wrt to each other. // ALSO reads & writes act as aquire & release, so: // (2) A read cannot let unrelated NON-volatile memory refs that happen after // the read float up to before the read. It's OK for non-volatile memory refs // that happen before the volatile read to float down below it. // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs // that happen BEFORE the write float down to after the write. It's OK for // non-volatile memory refs that happen after the volatile write to float up // before it. // // We only put in barriers around volatile refs (they are expensive), not // _between_ memory refs (that would require us to track the flavor of the // previous memory refs). Requirements (2) and (3) require some barriers // before volatile stores and after volatile loads. These nearly cover // requirement (1) but miss the volatile-store-volatile-load case. This final // case is placed after volatile-stores although it could just as well go // before volatile-loads. void LIRGenerator::do_StoreField(StoreField* x) { bool needs_patching = x->needs_patching(); bool is_volatile = x->field()->is_volatile(); BasicType field_type = x->field_type(); bool is_oop = (field_type == T_ARRAY || field_type == T_OBJECT); CodeEmitInfo* info = NULL; if (needs_patching) { assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); info = state_for(x, x->state_before()); } else if (x->needs_null_check()) { NullCheck* nc = x->explicit_null_check(); if (nc == NULL) { info = state_for(x); } else { info = state_for(nc); } } LIRItem object(x->obj(), this); LIRItem value(x->value(), this); object.load_item(); if (is_volatile || needs_patching) { // load item if field is volatile (fewer special cases for volatiles) // load item if field not initialized // load item if field not constant // because of code patching we cannot inline constants if (field_type == T_BYTE || field_type == T_BOOLEAN) { value.load_byte_item(); } else { value.load_item(); } } else { value.load_for_store(field_type); } set_no_result(x); #ifndef PRODUCT if (PrintNotLoaded && needs_patching) { tty->print_cr(" ###class not loaded at store_%s bci %d", x->is_static() ? "static" : "field", x->printable_bci()); } #endif if (x->needs_null_check() && (needs_patching || MacroAssembler::needs_explicit_null_check(x->offset()))) { // emit an explicit null check because the offset is too large __ null_check(object.result(), new CodeEmitInfo(info)); } LIR_Address* address; if (needs_patching) { // we need to patch the offset in the instruction so don't allow // generate_address to try to be smart about emitting the -1. // Otherwise the patching code won't know how to find the // instruction to patch. address = new LIR_Address(object.result(), PATCHED_ADDR, field_type); } else { address = generate_address(object.result(), x->offset(), field_type); } if (is_volatile && os::is_MP()) { __ membar_release(); } if (is_oop) { // Do the pre-write barrier, if any. pre_barrier(LIR_OprFact::address(address), LIR_OprFact::illegalOpr /* pre_val */, true /* do_load*/, needs_patching, (info ? new CodeEmitInfo(info) : NULL)); } if (is_volatile && !needs_patching) { volatile_field_store(value.result(), address, info); } else { LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; __ store(value.result(), address, info, patch_code); } if (is_oop) { // Store to object so mark the card of the header post_barrier(object.result(), value.result()); } if (is_volatile && os::is_MP()) { __ membar(); } } void LIRGenerator::do_LoadField(LoadField* x) { bool needs_patching = x->needs_patching(); bool is_volatile = x->field()->is_volatile(); BasicType field_type = x->field_type(); CodeEmitInfo* info = NULL; if (needs_patching) { assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); info = state_for(x, x->state_before()); } else if (x->needs_null_check()) { NullCheck* nc = x->explicit_null_check(); if (nc == NULL) { info = state_for(x); } else { info = state_for(nc); } } LIRItem object(x->obj(), this); object.load_item(); #ifndef PRODUCT if (PrintNotLoaded && needs_patching) { tty->print_cr(" ###class not loaded at load_%s bci %d", x->is_static() ? "static" : "field", x->printable_bci()); } #endif bool stress_deopt = StressLoopInvariantCodeMotion && info && info->deoptimize_on_exception(); if (x->needs_null_check() && (needs_patching || MacroAssembler::needs_explicit_null_check(x->offset()) || stress_deopt)) { LIR_Opr obj = object.result(); if (stress_deopt) { obj = new_register(T_OBJECT); __ move(LIR_OprFact::oopConst(NULL), obj); } // emit an explicit null check because the offset is too large __ null_check(obj, new CodeEmitInfo(info)); } LIR_Opr reg = rlock_result(x, field_type); LIR_Address* address; if (needs_patching) { // we need to patch the offset in the instruction so don't allow // generate_address to try to be smart about emitting the -1. // Otherwise the patching code won't know how to find the // instruction to patch. address = new LIR_Address(object.result(), PATCHED_ADDR, field_type); } else { address = generate_address(object.result(), x->offset(), field_type); } if (is_volatile && !needs_patching) { volatile_field_load(address, reg, info); } else { LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; __ load(address, reg, info, patch_code); } if (is_volatile && os::is_MP()) { __ membar_acquire(); } } //------------------------java.nio.Buffer.checkIndex------------------------ // int java.nio.Buffer.checkIndex(int) void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) { // NOTE: by the time we are in checkIndex() we are guaranteed that // the buffer is non-null (because checkIndex is package-private and // only called from within other methods in the buffer). assert(x->number_of_arguments() == 2, "wrong type"); LIRItem buf (x->argument_at(0), this); LIRItem index(x->argument_at(1), this); buf.load_item(); index.load_item(); LIR_Opr result = rlock_result(x); if (GenerateRangeChecks) { CodeEmitInfo* info = state_for(x); CodeStub* stub = new RangeCheckStub(info, index.result(), true); if (index.result()->is_constant()) { cmp_mem_int(lir_cond_belowEqual, buf.result(), java_nio_Buffer::limit_offset(), index.result()->as_jint(), info); __ branch(lir_cond_belowEqual, T_INT, stub); } else { cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf.result(), java_nio_Buffer::limit_offset(), T_INT, info); __ branch(lir_cond_aboveEqual, T_INT, stub); } __ move(index.result(), result); } else { // Just load the index into the result register __ move(index.result(), result); } } //------------------------array access-------------------------------------- void LIRGenerator::do_ArrayLength(ArrayLength* x) { LIRItem array(x->array(), this); array.load_item(); LIR_Opr reg = rlock_result(x); CodeEmitInfo* info = NULL; if (x->needs_null_check()) { NullCheck* nc = x->explicit_null_check(); if (nc == NULL) { info = state_for(x); } else { info = state_for(nc); } if (StressLoopInvariantCodeMotion && info->deoptimize_on_exception()) { LIR_Opr obj = new_register(T_OBJECT); __ move(LIR_OprFact::oopConst(NULL), obj); __ null_check(obj, new CodeEmitInfo(info)); } } __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none); } void LIRGenerator::do_LoadIndexed(LoadIndexed* x) { bool use_length = x->length() != NULL; LIRItem array(x->array(), this); LIRItem index(x->index(), this); LIRItem length(this); bool needs_range_check = x->compute_needs_range_check(); if (use_length && needs_range_check) { length.set_instruction(x->length()); length.load_item(); } array.load_item(); if (index.is_constant() && can_inline_as_constant(x->index())) { // let it be a constant index.dont_load_item(); } else { index.load_item(); } CodeEmitInfo* range_check_info = state_for(x); CodeEmitInfo* null_check_info = NULL; if (x->needs_null_check()) { NullCheck* nc = x->explicit_null_check(); if (nc != NULL) { null_check_info = state_for(nc); } else { null_check_info = range_check_info; } if (StressLoopInvariantCodeMotion && null_check_info->deoptimize_on_exception()) { LIR_Opr obj = new_register(T_OBJECT); __ move(LIR_OprFact::oopConst(NULL), obj); __ null_check(obj, new CodeEmitInfo(null_check_info)); } } // emit array address setup early so it schedules better LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), false); if (GenerateRangeChecks && needs_range_check) { if (StressLoopInvariantCodeMotion && range_check_info->deoptimize_on_exception()) { __ branch(lir_cond_always, T_ILLEGAL, new RangeCheckStub(range_check_info, index.result())); } else if (use_length) { // TODO: use a (modified) version of array_range_check that does not require a // constant length to be loaded to a register __ cmp(lir_cond_belowEqual, length.result(), index.result()); __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result())); } else { array_range_check(array.result(), index.result(), null_check_info, range_check_info); // The range check performs the null check, so clear it out for the load null_check_info = NULL; } } __ move(array_addr, rlock_result(x, x->elt_type()), null_check_info); } void LIRGenerator::do_NullCheck(NullCheck* x) { if (x->can_trap()) { LIRItem value(x->obj(), this); value.load_item(); CodeEmitInfo* info = state_for(x); __ null_check(value.result(), info); } } void LIRGenerator::do_TypeCast(TypeCast* x) { LIRItem value(x->obj(), this); value.load_item(); // the result is the same as from the node we are casting set_result(x, value.result()); } void LIRGenerator::do_Throw(Throw* x) { LIRItem exception(x->exception(), this); exception.load_item(); set_no_result(x); LIR_Opr exception_opr = exception.result(); CodeEmitInfo* info = state_for(x, x->state()); #ifndef PRODUCT if (PrintC1Statistics) { increment_counter(Runtime1::throw_count_address(), T_INT); } #endif // check if the instruction has an xhandler in any of the nested scopes bool unwind = false; if (info->exception_handlers()->length() == 0) { // this throw is not inside an xhandler unwind = true; } else { // get some idea of the throw type bool type_is_exact = true; ciType* throw_type = x->exception()->exact_type(); if (throw_type == NULL) { type_is_exact = false; throw_type = x->exception()->declared_type(); } if (throw_type != NULL && throw_type->is_instance_klass()) { ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type; unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact); } } // do null check before moving exception oop into fixed register // to avoid a fixed interval with an oop during the null check. // Use a copy of the CodeEmitInfo because debug information is // different for null_check and throw. if (GenerateCompilerNullChecks && (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL)) { // if the exception object wasn't created using new then it might be null. __ null_check(exception_opr, new CodeEmitInfo(info, x->state()->copy(ValueStack::ExceptionState, x->state()->bci()))); } if (compilation()->env()->jvmti_can_post_on_exceptions()) { // we need to go through the exception lookup path to get JVMTI // notification done unwind = false; } // move exception oop into fixed register __ move(exception_opr, exceptionOopOpr()); if (unwind) { __ unwind_exception(exceptionOopOpr()); } else { __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info); } } void LIRGenerator::do_RoundFP(RoundFP* x) { LIRItem input(x->input(), this); input.load_item(); LIR_Opr input_opr = input.result(); assert(input_opr->is_register(), "why round if value is not in a register?"); assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value"); if (input_opr->is_single_fpu()) { set_result(x, round_item(input_opr)); // This code path not currently taken } else { LIR_Opr result = new_register(T_DOUBLE); set_vreg_flag(result, must_start_in_memory); __ roundfp(input_opr, LIR_OprFact::illegalOpr, result); set_result(x, result); } } // Here UnsafeGetRaw may have x->base() and x->index() be int or long // on both 64 and 32 bits. Expecting x->base() to be always long on 64bit. void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) { LIRItem base(x->base(), this); LIRItem idx(this); base.load_item(); if (x->has_index()) { idx.set_instruction(x->index()); idx.load_nonconstant(); } LIR_Opr reg = rlock_result(x, x->basic_type()); int log2_scale = 0; if (x->has_index()) { log2_scale = x->log2_scale(); } assert(!x->has_index() || idx.value() == x->index(), "should match"); LIR_Opr base_op = base.result(); LIR_Opr index_op = idx.result(); #ifndef _LP64 if (x->base()->type()->tag() == longTag) { base_op = new_register(T_INT); __ convert(Bytecodes::_l2i, base.result(), base_op); } if (x->has_index()) { if (x->index()->type()->tag() == longTag) { LIR_Opr long_index_op = index_op; if (x->index()->type()->is_constant()) { long_index_op = new_register(T_LONG); __ move(index_op, long_index_op); } index_op = new_register(T_INT); __ convert(Bytecodes::_l2i, long_index_op, index_op); } else { assert(x->index()->type()->tag() == intTag, "must be"); } } // At this point base and index should be all ints. assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); assert(!x->has_index() || index_op->type() == T_INT, "index should be an int"); #else if (x->has_index()) { if (x->index()->type()->tag() == intTag) { if (!x->index()->type()->is_constant()) { index_op = new_register(T_LONG); __ convert(Bytecodes::_i2l, idx.result(), index_op); } } else { assert(x->index()->type()->tag() == longTag, "must be"); if (x->index()->type()->is_constant()) { index_op = new_register(T_LONG); __ move(idx.result(), index_op); } } } // At this point base is a long non-constant // Index is a long register or a int constant. // We allow the constant to stay an int because that would allow us a more compact encoding by // embedding an immediate offset in the address expression. If we have a long constant, we have to // move it into a register first. assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a long non-constant"); assert(!x->has_index() || (index_op->type() == T_INT && index_op->is_constant()) || (index_op->type() == T_LONG && !index_op->is_constant()), "unexpected index type"); #endif BasicType dst_type = x->basic_type(); LIR_Address* addr; if (index_op->is_constant()) { assert(log2_scale == 0, "must not have a scale"); assert(index_op->type() == T_INT, "only int constants supported"); addr = new LIR_Address(base_op, index_op->as_jint(), dst_type); } else { #ifdef X86 addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type); #elif defined(ARM) addr = generate_address(base_op, index_op, log2_scale, 0, dst_type); #else if (index_op->is_illegal() || log2_scale == 0) { addr = new LIR_Address(base_op, index_op, dst_type); } else { LIR_Opr tmp = new_pointer_register(); __ shift_left(index_op, log2_scale, tmp); addr = new LIR_Address(base_op, tmp, dst_type); } #endif } if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) { __ unaligned_move(addr, reg); } else { if (dst_type == T_OBJECT && x->is_wide()) { __ move_wide(addr, reg); } else { __ move(addr, reg); } } } void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) { int log2_scale = 0; BasicType type = x->basic_type(); if (x->has_index()) { log2_scale = x->log2_scale(); } LIRItem base(x->base(), this); LIRItem value(x->value(), this); LIRItem idx(this); base.load_item(); if (x->has_index()) { idx.set_instruction(x->index()); idx.load_item(); } if (type == T_BYTE || type == T_BOOLEAN) { value.load_byte_item(); } else { value.load_item(); } set_no_result(x); LIR_Opr base_op = base.result(); LIR_Opr index_op = idx.result(); #ifndef _LP64 if (x->base()->type()->tag() == longTag) { base_op = new_register(T_INT); __ convert(Bytecodes::_l2i, base.result(), base_op); } if (x->has_index()) { if (x->index()->type()->tag() == longTag) { index_op = new_register(T_INT); __ convert(Bytecodes::_l2i, idx.result(), index_op); } } // At this point base and index should be all ints and not constants assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); assert(!x->has_index() || (index_op->type() == T_INT && !index_op->is_constant()), "index should be an non-constant int"); #else if (x->has_index()) { if (x->index()->type()->tag() == intTag) { index_op = new_register(T_LONG); __ convert(Bytecodes::_i2l, idx.result(), index_op); } } // At this point base and index are long and non-constant assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a non-constant long"); assert(!x->has_index() || (index_op->type() == T_LONG && !index_op->is_constant()), "index must be a non-constant long"); #endif if (log2_scale != 0) { // temporary fix (platform dependent code without shift on Intel would be better) // TODO: ARM also allows embedded shift in the address __ shift_left(index_op, log2_scale, index_op); } LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type()); __ move(value.result(), addr); } void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) { BasicType type = x->basic_type(); LIRItem src(x->object(), this); LIRItem off(x->offset(), this); off.load_item(); src.load_item(); LIR_Opr value = rlock_result(x, x->basic_type()); get_Object_unsafe(value, src.result(), off.result(), type, x->is_volatile()); #if INCLUDE_ALL_GCS // We might be reading the value of the referent field of a // Reference object in order to attach it back to the live // object graph. If G1 is enabled then we need to record // the value that is being returned in an SATB log buffer. // // We need to generate code similar to the following... // // if (offset == java_lang_ref_Reference::referent_offset) { // if (src != NULL) { // if (klass(src)->reference_type() != REF_NONE) { // pre_barrier(..., value, ...); // } // } // } if (UseG1GC && type == T_OBJECT) { bool gen_pre_barrier = true; // Assume we need to generate pre_barrier. bool gen_offset_check = true; // Assume we need to generate the offset guard. bool gen_source_check = true; // Assume we need to check the src object for null. bool gen_type_check = true; // Assume we need to check the reference_type. if (off.is_constant()) { jlong off_con = (off.type()->is_int() ? (jlong) off.get_jint_constant() : off.get_jlong_constant()); if (off_con != (jlong) java_lang_ref_Reference::referent_offset) { // The constant offset is something other than referent_offset. // We can skip generating/checking the remaining guards and // skip generation of the code stub. gen_pre_barrier = false; } else { // The constant offset is the same as referent_offset - // we do not need to generate a runtime offset check. gen_offset_check = false; } } // We don't need to generate stub if the source object is an array if (gen_pre_barrier && src.type()->is_array()) { gen_pre_barrier = false; } if (gen_pre_barrier) { // We still need to continue with the checks. if (src.is_constant()) { ciObject* src_con = src.get_jobject_constant(); guarantee(src_con != NULL, "no source constant"); if (src_con->is_null_object()) { // The constant src object is null - We can skip // generating the code stub. gen_pre_barrier = false; } else { // Non-null constant source object. We still have to generate // the slow stub - but we don't need to generate the runtime // null object check. gen_source_check = false; } } } if (gen_pre_barrier && !PatchALot) { // Can the klass of object be statically determined to be // a sub-class of Reference? ciType* type = src.value()->declared_type(); if ((type != NULL) && type->is_loaded()) { if (type->is_subtype_of(compilation()->env()->Reference_klass())) { gen_type_check = false; } else if (type->is_klass() && !compilation()->env()->Object_klass()->is_subtype_of(type->as_klass())) { // Not Reference and not Object klass. gen_pre_barrier = false; } } } if (gen_pre_barrier) { LabelObj* Lcont = new LabelObj(); // We can have generate one runtime check here. Let's start with // the offset check. if (gen_offset_check) { // if (offset != referent_offset) -> continue // If offset is an int then we can do the comparison with the // referent_offset constant; otherwise we need to move // referent_offset into a temporary register and generate // a reg-reg compare. LIR_Opr referent_off; if (off.type()->is_int()) { referent_off = LIR_OprFact::intConst(java_lang_ref_Reference::referent_offset); } else { assert(off.type()->is_long(), "what else?"); referent_off = new_register(T_LONG); __ move(LIR_OprFact::longConst(java_lang_ref_Reference::referent_offset), referent_off); } __ cmp(lir_cond_notEqual, off.result(), referent_off); __ branch(lir_cond_notEqual, as_BasicType(off.type()), Lcont->label()); } if (gen_source_check) { // offset is a const and equals referent offset // if (source == null) -> continue __ cmp(lir_cond_equal, src.result(), LIR_OprFact::oopConst(NULL)); __ branch(lir_cond_equal, T_OBJECT, Lcont->label()); } LIR_Opr src_klass = new_register(T_OBJECT); if (gen_type_check) { // We have determined that offset == referent_offset && src != null. // if (src->_klass->_reference_type == REF_NONE) -> continue __ move(new LIR_Address(src.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), src_klass); LIR_Address* reference_type_addr = new LIR_Address(src_klass, in_bytes(InstanceKlass::reference_type_offset()), T_BYTE); LIR_Opr reference_type = new_register(T_INT); __ move(reference_type_addr, reference_type); __ cmp(lir_cond_equal, reference_type, LIR_OprFact::intConst(REF_NONE)); __ branch(lir_cond_equal, T_INT, Lcont->label()); } { // We have determined that src->_klass->_reference_type != REF_NONE // so register the value in the referent field with the pre-barrier. pre_barrier(LIR_OprFact::illegalOpr /* addr_opr */, value /* pre_val */, false /* do_load */, false /* patch */, NULL /* info */); } __ branch_destination(Lcont->label()); } } #endif // INCLUDE_ALL_GCS if (x->is_volatile() && os::is_MP()) __ membar_acquire(); } void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) { BasicType type = x->basic_type(); LIRItem src(x->object(), this); LIRItem off(x->offset(), this); LIRItem data(x->value(), this); src.load_item(); if (type == T_BOOLEAN || type == T_BYTE) { data.load_byte_item(); } else { data.load_item(); } off.load_item(); set_no_result(x); if (x->is_volatile() && os::is_MP()) __ membar_release(); put_Object_unsafe(src.result(), off.result(), data.result(), type, x->is_volatile()); if (x->is_volatile() && os::is_MP()) __ membar(); } void LIRGenerator::do_UnsafePrefetch(UnsafePrefetch* x, bool is_store) { LIRItem src(x->object(), this); LIRItem off(x->offset(), this); src.load_item(); if (off.is_constant() && can_inline_as_constant(x->offset())) { // let it be a constant off.dont_load_item(); } else { off.load_item(); } set_no_result(x); LIR_Address* addr = generate_address(src.result(), off.result(), 0, 0, T_BYTE); __ prefetch(addr, is_store); } void LIRGenerator::do_UnsafePrefetchRead(UnsafePrefetchRead* x) { do_UnsafePrefetch(x, false); } void LIRGenerator::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) { do_UnsafePrefetch(x, true); } void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) { int lng = x->length(); for (int i = 0; i < lng; i++) { SwitchRange* one_range = x->at(i); int low_key = one_range->low_key(); int high_key = one_range->high_key(); BlockBegin* dest = one_range->sux(); if (low_key == high_key) { __ cmp(lir_cond_equal, value, low_key); __ branch(lir_cond_equal, T_INT, dest); } else if (high_key - low_key == 1) { __ cmp(lir_cond_equal, value, low_key); __ branch(lir_cond_equal, T_INT, dest); __ cmp(lir_cond_equal, value, high_key); __ branch(lir_cond_equal, T_INT, dest); } else { LabelObj* L = new LabelObj(); __ cmp(lir_cond_less, value, low_key); __ branch(lir_cond_less, T_INT, L->label()); __ cmp(lir_cond_lessEqual, value, high_key); __ branch(lir_cond_lessEqual, T_INT, dest); __ branch_destination(L->label()); } } __ jump(default_sux); } SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) { SwitchRangeList* res = new SwitchRangeList(); int len = x->length(); if (len > 0) { BlockBegin* sux = x->sux_at(0); int key = x->lo_key(); BlockBegin* default_sux = x->default_sux(); SwitchRange* range = new SwitchRange(key, sux); for (int i = 0; i < len; i++, key++) { BlockBegin* new_sux = x->sux_at(i); if (sux == new_sux) { // still in same range range->set_high_key(key); } else { // skip tests which explicitly dispatch to the default if (sux != default_sux) { res->append(range); } range = new SwitchRange(key, new_sux); } sux = new_sux; } if (res->length() == 0 || res->last() != range) res->append(range); } return res; } // we expect the keys to be sorted by increasing value SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) { SwitchRangeList* res = new SwitchRangeList(); int len = x->length(); if (len > 0) { BlockBegin* default_sux = x->default_sux(); int key = x->key_at(0); BlockBegin* sux = x->sux_at(0); SwitchRange* range = new SwitchRange(key, sux); for (int i = 1; i < len; i++) { int new_key = x->key_at(i); BlockBegin* new_sux = x->sux_at(i); if (key+1 == new_key && sux == new_sux) { // still in same range range->set_high_key(new_key); } else { // skip tests which explicitly dispatch to the default if (range->sux() != default_sux) { res->append(range); } range = new SwitchRange(new_key, new_sux); } key = new_key; sux = new_sux; } if (res->length() == 0 || res->last() != range) res->append(range); } return res; } void LIRGenerator::do_TableSwitch(TableSwitch* x) { LIRItem tag(x->tag(), this); tag.load_item(); set_no_result(x); if (x->is_safepoint()) { __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); } // move values into phi locations move_to_phi(x->state()); int lo_key = x->lo_key(); int hi_key = x->hi_key(); int len = x->length(); LIR_Opr value = tag.result(); if (UseTableRanges) { do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); } else { for (int i = 0; i < len; i++) { __ cmp(lir_cond_equal, value, i + lo_key); __ branch(lir_cond_equal, T_INT, x->sux_at(i)); } __ jump(x->default_sux()); } } void LIRGenerator::do_LookupSwitch(LookupSwitch* x) { LIRItem tag(x->tag(), this); tag.load_item(); set_no_result(x); if (x->is_safepoint()) { __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); } // move values into phi locations move_to_phi(x->state()); LIR_Opr value = tag.result(); if (UseTableRanges) { do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); } else { int len = x->length(); for (int i = 0; i < len; i++) { __ cmp(lir_cond_equal, value, x->key_at(i)); __ branch(lir_cond_equal, T_INT, x->sux_at(i)); } __ jump(x->default_sux()); } } void LIRGenerator::do_Goto(Goto* x) { set_no_result(x); if (block()->next()->as_OsrEntry()) { // need to free up storage used for OSR entry point LIR_Opr osrBuffer = block()->next()->operand(); BasicTypeList signature; signature.append(T_INT); CallingConvention* cc = frame_map()->c_calling_convention(&signature); __ move(osrBuffer, cc->args()->at(0)); __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), getThreadTemp(), LIR_OprFact::illegalOpr, cc->args()); } if (x->is_safepoint()) { ValueStack* state = x->state_before() ? x->state_before() : x->state(); // increment backedge counter if needed CodeEmitInfo* info = state_for(x, state); increment_backedge_counter(info, x->profiled_bci()); CodeEmitInfo* safepoint_info = state_for(x, state); __ safepoint(safepoint_poll_register(), safepoint_info); } // Gotos can be folded Ifs, handle this case. if (x->should_profile()) { ciMethod* method = x->profiled_method(); assert(method != NULL, "method should be set if branch is profiled"); ciMethodData* md = method->method_data_or_null(); assert(md != NULL, "Sanity"); ciProfileData* data = md->bci_to_data(x->profiled_bci()); assert(data != NULL, "must have profiling data"); int offset; if (x->direction() == Goto::taken) { assert(data->is_BranchData(), "need BranchData for two-way branches"); offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); } else if (x->direction() == Goto::not_taken) { assert(data->is_BranchData(), "need BranchData for two-way branches"); offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); } else { assert(data->is_JumpData(), "need JumpData for branches"); offset = md->byte_offset_of_slot(data, JumpData::taken_offset()); } LIR_Opr md_reg = new_register(T_METADATA); __ metadata2reg(md->constant_encoding(), md_reg); increment_counter(new LIR_Address(md_reg, offset, NOT_LP64(T_INT) LP64_ONLY(T_LONG)), DataLayout::counter_increment); } // emit phi-instruction move after safepoint since this simplifies // describing the state as the safepoint. move_to_phi(x->state()); __ jump(x->default_sux()); } /** * Emit profiling code if needed for arguments, parameters, return value types * * @param md MDO the code will update at runtime * @param md_base_offset common offset in the MDO for this profile and subsequent ones * @param md_offset offset in the MDO (on top of md_base_offset) for this profile * @param profiled_k current profile * @param obj IR node for the object to be profiled * @param mdp register to hold the pointer inside the MDO (md + md_base_offset). * Set once we find an update to make and use for next ones. * @param not_null true if we know obj cannot be null * @param signature_at_call_k signature at call for obj * @param callee_signature_k signature of callee for obj * at call and callee signatures differ at method handle call * @return the only klass we know will ever be seen at this profile point */ ciKlass* LIRGenerator::profile_type(ciMethodData* md, int md_base_offset, int md_offset, intptr_t profiled_k, Value obj, LIR_Opr& mdp, bool not_null, ciKlass* signature_at_call_k, ciKlass* callee_signature_k) { ciKlass* result = NULL; bool do_null = !not_null && !TypeEntries::was_null_seen(profiled_k); bool do_update = !TypeEntries::is_type_unknown(profiled_k); // known not to be null or null bit already set and already set to // unknown: nothing we can do to improve profiling if (!do_null && !do_update) { return result; } ciKlass* exact_klass = NULL; Compilation* comp = Compilation::current(); if (do_update) { // try to find exact type, using CHA if possible, so that loading // the klass from the object can be avoided ciType* type = obj->exact_type(); if (type == NULL) { type = obj->declared_type(); type = comp->cha_exact_type(type); } assert(type == NULL || type->is_klass(), "type should be class"); exact_klass = (type != NULL && type->is_loaded()) ? (ciKlass*)type : NULL; do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; } if (!do_null && !do_update) { return result; } ciKlass* exact_signature_k = NULL; if (do_update) { // Is the type from the signature exact (the only one possible)? exact_signature_k = signature_at_call_k->exact_klass(); if (exact_signature_k == NULL) { exact_signature_k = comp->cha_exact_type(signature_at_call_k); } else { result = exact_signature_k; // Known statically. No need to emit any code: prevent // LIR_Assembler::emit_profile_type() from emitting useless code profiled_k = ciTypeEntries::with_status(result, profiled_k); } // exact_klass and exact_signature_k can be both non NULL but // different if exact_klass is loaded after the ciObject for // exact_signature_k is created. if (exact_klass == NULL && exact_signature_k != NULL && exact_klass != exact_signature_k) { // sometimes the type of the signature is better than the best type // the compiler has exact_klass = exact_signature_k; } if (callee_signature_k != NULL && callee_signature_k != signature_at_call_k) { ciKlass* improved_klass = callee_signature_k->exact_klass(); if (improved_klass == NULL) { improved_klass = comp->cha_exact_type(callee_signature_k); } if (exact_klass == NULL && improved_klass != NULL && exact_klass != improved_klass) { exact_klass = exact_signature_k; } } do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; } if (!do_null && !do_update) { return result; } if (mdp == LIR_OprFact::illegalOpr) { mdp = new_register(T_METADATA); __ metadata2reg(md->constant_encoding(), mdp); if (md_base_offset != 0) { LIR_Address* base_type_address = new LIR_Address(mdp, md_base_offset, T_ADDRESS); mdp = new_pointer_register(); __ leal(LIR_OprFact::address(base_type_address), mdp); } } LIRItem value(obj, this); value.load_item(); __ profile_type(new LIR_Address(mdp, md_offset, T_METADATA), value.result(), exact_klass, profiled_k, new_pointer_register(), not_null, exact_signature_k != NULL); return result; } // profile parameters on entry to the root of the compilation void LIRGenerator::profile_parameters(Base* x) { if (compilation()->profile_parameters()) { CallingConvention* args = compilation()->frame_map()->incoming_arguments(); ciMethodData* md = scope()->method()->method_data_or_null(); assert(md != NULL, "Sanity"); if (md->parameters_type_data() != NULL) { ciParametersTypeData* parameters_type_data = md->parameters_type_data(); ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); LIR_Opr mdp = LIR_OprFact::illegalOpr; for (int java_index = 0, i = 0, j = 0; j < parameters_type_data->number_of_parameters(); i++) { LIR_Opr src = args->at(i); assert(!src->is_illegal(), "check"); BasicType t = src->type(); if (t == T_OBJECT || t == T_ARRAY) { intptr_t profiled_k = parameters->type(j); Local* local = x->state()->local_at(java_index)->as_Local(); ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), in_bytes(ParametersTypeData::type_offset(j)) - in_bytes(ParametersTypeData::type_offset(0)), profiled_k, local, mdp, false, local->declared_type()->as_klass(), NULL); // If the profile is known statically set it once for all and do not emit any code if (exact != NULL) { md->set_parameter_type(j, exact); } j++; } java_index += type2size[t]; } } } } void LIRGenerator::do_Base(Base* x) { __ std_entry(LIR_OprFact::illegalOpr); // Emit moves from physical registers / stack slots to virtual registers CallingConvention* args = compilation()->frame_map()->incoming_arguments(); IRScope* irScope = compilation()->hir()->top_scope(); int java_index = 0; for (int i = 0; i < args->length(); i++) { LIR_Opr src = args->at(i); assert(!src->is_illegal(), "check"); BasicType t = src->type(); // Types which are smaller than int are passed as int, so // correct the type which passed. switch (t) { case T_BYTE: case T_BOOLEAN: case T_SHORT: case T_CHAR: t = T_INT; break; } LIR_Opr dest = new_register(t); __ move(src, dest); // Assign new location to Local instruction for this local Local* local = x->state()->local_at(java_index)->as_Local(); assert(local != NULL, "Locals for incoming arguments must have been created"); #ifndef __SOFTFP__ // The java calling convention passes double as long and float as int. assert(as_ValueType(t)->tag() == local->type()->tag(), "check"); #endif // __SOFTFP__ local->set_operand(dest); _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL); java_index += type2size[t]; } if (compilation()->env()->dtrace_method_probes()) { BasicTypeList signature; signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread signature.append(T_METADATA); // Method* LIR_OprList* args = new LIR_OprList(); args->append(getThreadPointer()); LIR_Opr meth = new_register(T_METADATA); __ metadata2reg(method()->constant_encoding(), meth); args->append(meth); call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL); } if (method()->is_synchronized()) { LIR_Opr obj; if (method()->is_static()) { obj = new_register(T_OBJECT); __ oop2reg(method()->holder()->java_mirror()->constant_encoding(), obj); } else { Local* receiver = x->state()->local_at(0)->as_Local(); assert(receiver != NULL, "must already exist"); obj = receiver->operand(); } assert(obj->is_valid(), "must be valid"); if (method()->is_synchronized() && GenerateSynchronizationCode) { LIR_Opr lock = new_register(T_INT); __ load_stack_address_monitor(0, lock); CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, x->check_flag(Instruction::DeoptimizeOnException)); CodeStub* slow_path = new MonitorEnterStub(obj, lock, info); // receiver is guaranteed non-NULL so don't need CodeEmitInfo __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL); } } // increment invocation counters if needed if (!method()->is_accessor()) { // Accessors do not have MDOs, so no counting. profile_parameters(x); CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, false); increment_invocation_counter(info); } // all blocks with a successor must end with an unconditional jump // to the successor even if they are consecutive __ jump(x->default_sux()); } void LIRGenerator::do_OsrEntry(OsrEntry* x) { // construct our frame and model the production of incoming pointer // to the OSR buffer. __ osr_entry(LIR_Assembler::osrBufferPointer()); LIR_Opr result = rlock_result(x); __ move(LIR_Assembler::osrBufferPointer(), result); } void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) { assert(args->length() == arg_list->length(), err_msg_res("args=%d, arg_list=%d", args->length(), arg_list->length())); for (int i = x->has_receiver() ? 1 : 0; i < args->length(); i++) { LIRItem* param = args->at(i); LIR_Opr loc = arg_list->at(i); if (loc->is_register()) { param->load_item_force(loc); } else { LIR_Address* addr = loc->as_address_ptr(); param->load_for_store(addr->type()); if (addr->type() == T_OBJECT) { __ move_wide(param->result(), addr); } else if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { __ unaligned_move(param->result(), addr); } else { __ move(param->result(), addr); } } } if (x->has_receiver()) { LIRItem* receiver = args->at(0); LIR_Opr loc = arg_list->at(0); if (loc->is_register()) { receiver->load_item_force(loc); } else { assert(loc->is_address(), "just checking"); receiver->load_for_store(T_OBJECT); __ move_wide(receiver->result(), loc->as_address_ptr()); } } } // Visits all arguments, returns appropriate items without loading them LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) { LIRItemList* argument_items = new LIRItemList(); if (x->has_receiver()) { LIRItem* receiver = new LIRItem(x->receiver(), this); argument_items->append(receiver); } for (int i = 0; i < x->number_of_arguments(); i++) { LIRItem* param = new LIRItem(x->argument_at(i), this); argument_items->append(param); } return argument_items; } // The invoke with receiver has following phases: // a) traverse and load/lock receiver; // b) traverse all arguments -> item-array (invoke_visit_argument) // c) push receiver on stack // d) load each of the items and push on stack // e) unlock receiver // f) move receiver into receiver-register %o0 // g) lock result registers and emit call operation // // Before issuing a call, we must spill-save all values on stack // that are in caller-save register. "spill-save" moves thos registers // either in a free callee-save register or spills them if no free // callee save register is available. // // The problem is where to invoke spill-save. // - if invoked between e) and f), we may lock callee save // register in "spill-save" that destroys the receiver register // before f) is executed // - if we rearange the f) to be earlier, by loading %o0, it // may destroy a value on the stack that is currently in %o0 // and is waiting to be spilled // - if we keep the receiver locked while doing spill-save, // we cannot spill it as it is spill-locked // void LIRGenerator::do_Invoke(Invoke* x) { CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true); LIR_OprList* arg_list = cc->args(); LIRItemList* args = invoke_visit_arguments(x); LIR_Opr receiver = LIR_OprFact::illegalOpr; // setup result register LIR_Opr result_register = LIR_OprFact::illegalOpr; if (x->type() != voidType) { result_register = result_register_for(x->type()); } CodeEmitInfo* info = state_for(x, x->state()); invoke_load_arguments(x, args, arg_list); if (x->has_receiver()) { args->at(0)->load_item_force(LIR_Assembler::receiverOpr()); receiver = args->at(0)->result(); } // emit invoke code bool optimized = x->target_is_loaded() && x->target_is_final(); assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match"); // JSR 292 // Preserve the SP over MethodHandle call sites. ciMethod* target = x->target(); bool is_method_handle_invoke = (// %%% FIXME: Are both of these relevant? target->is_method_handle_intrinsic() || target->is_compiled_lambda_form()); if (is_method_handle_invoke) { info->set_is_method_handle_invoke(true); __ move(FrameMap::stack_pointer(), FrameMap::method_handle_invoke_SP_save_opr()); } switch (x->code()) { case Bytecodes::_invokestatic: __ call_static(target, result_register, SharedRuntime::get_resolve_static_call_stub(), arg_list, info); break; case Bytecodes::_invokespecial: case Bytecodes::_invokevirtual: case Bytecodes::_invokeinterface: // for final target we still produce an inline cache, in order // to be able to call mixed mode if (x->code() == Bytecodes::_invokespecial || optimized) { __ call_opt_virtual(target, receiver, result_register, SharedRuntime::get_resolve_opt_virtual_call_stub(), arg_list, info); } else if (x->vtable_index() < 0) { __ call_icvirtual(target, receiver, result_register, SharedRuntime::get_resolve_virtual_call_stub(), arg_list, info); } else { int entry_offset = InstanceKlass::vtable_start_offset() + x->vtable_index() * vtableEntry::size(); int vtable_offset = entry_offset * wordSize + vtableEntry::method_offset_in_bytes(); __ call_virtual(target, receiver, result_register, vtable_offset, arg_list, info); } break; case Bytecodes::_invokedynamic: { __ call_dynamic(target, receiver, result_register, SharedRuntime::get_resolve_static_call_stub(), arg_list, info); break; } default: fatal(err_msg("unexpected bytecode: %s", Bytecodes::name(x->code()))); break; } // JSR 292 // Restore the SP after MethodHandle call sites. if (is_method_handle_invoke) { __ move(FrameMap::method_handle_invoke_SP_save_opr(), FrameMap::stack_pointer()); } if (x->type()->is_float() || x->type()->is_double()) { // Force rounding of results from non-strictfp when in strictfp // scope (or when we don't know the strictness of the callee, to // be safe.) if (method()->is_strict()) { if (!x->target_is_loaded() || !x->target_is_strictfp()) { result_register = round_item(result_register); } } } if (result_register->is_valid()) { LIR_Opr result = rlock_result(x); __ move(result_register, result); } } void LIRGenerator::do_FPIntrinsics(Intrinsic* x) { assert(x->number_of_arguments() == 1, "wrong type"); LIRItem value (x->argument_at(0), this); LIR_Opr reg = rlock_result(x); value.load_item(); LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type())); __ move(tmp, reg); } // Code for : x->x() {x->cond()} x->y() ? x->tval() : x->fval() void LIRGenerator::do_IfOp(IfOp* x) { #ifdef ASSERT { ValueTag xtag = x->x()->type()->tag(); ValueTag ttag = x->tval()->type()->tag(); assert(xtag == intTag || xtag == objectTag, "cannot handle others"); assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others"); assert(ttag == x->fval()->type()->tag(), "cannot handle others"); } #endif LIRItem left(x->x(), this); LIRItem right(x->y(), this); left.load_item(); if (can_inline_as_constant(right.value())) { right.dont_load_item(); } else { right.load_item(); } LIRItem t_val(x->tval(), this); LIRItem f_val(x->fval(), this); t_val.dont_load_item(); f_val.dont_load_item(); LIR_Opr reg = rlock_result(x); __ cmp(lir_cond(x->cond()), left.result(), right.result()); __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg, as_BasicType(x->x()->type())); } void LIRGenerator::do_RuntimeCall(address routine, int expected_arguments, Intrinsic* x) { assert(x->number_of_arguments() == expected_arguments, "wrong type"); LIR_Opr reg = result_register_for(x->type()); __ call_runtime_leaf(routine, getThreadTemp(), reg, new LIR_OprList()); LIR_Opr result = rlock_result(x); __ move(reg, result); } #ifdef TRACE_HAVE_INTRINSICS void LIRGenerator::do_ThreadIDIntrinsic(Intrinsic* x) { LIR_Opr thread = getThreadPointer(); LIR_Opr osthread = new_pointer_register(); __ move(new LIR_Address(thread, in_bytes(JavaThread::osthread_offset()), osthread->type()), osthread); size_t thread_id_size = OSThread::thread_id_size(); if (thread_id_size == (size_t) BytesPerLong) { LIR_Opr id = new_register(T_LONG); __ move(new LIR_Address(osthread, in_bytes(OSThread::thread_id_offset()), T_LONG), id); __ convert(Bytecodes::_l2i, id, rlock_result(x)); } else if (thread_id_size == (size_t) BytesPerInt) { __ move(new LIR_Address(osthread, in_bytes(OSThread::thread_id_offset()), T_INT), rlock_result(x)); } else { ShouldNotReachHere(); } } void LIRGenerator::do_ClassIDIntrinsic(Intrinsic* x) { CodeEmitInfo* info = state_for(x); CodeEmitInfo* info2 = new CodeEmitInfo(info); // Clone for the second null check BasicType klass_pointer_type = NOT_LP64(T_INT) LP64_ONLY(T_LONG); assert(info != NULL, "must have info"); LIRItem arg(x->argument_at(1), this); arg.load_item(); LIR_Opr klass = new_pointer_register(); __ move(new LIR_Address(arg.result(), java_lang_Class::klass_offset_in_bytes(), klass_pointer_type), klass, info); LIR_Opr id = new_register(T_LONG); ByteSize offset = TRACE_ID_OFFSET; LIR_Address* trace_id_addr = new LIR_Address(klass, in_bytes(offset), T_LONG); __ move(trace_id_addr, id); __ logical_or(id, LIR_OprFact::longConst(0x01l), id); __ store(id, trace_id_addr); __ logical_and(id, LIR_OprFact::longConst(~0x3l), id); __ move(id, rlock_result(x)); } #endif void LIRGenerator::do_Intrinsic(Intrinsic* x) { switch (x->id()) { case vmIntrinsics::_intBitsToFloat : case vmIntrinsics::_doubleToRawLongBits : case vmIntrinsics::_longBitsToDouble : case vmIntrinsics::_floatToRawIntBits : { do_FPIntrinsics(x); break; } #ifdef TRACE_HAVE_INTRINSICS case vmIntrinsics::_threadID: do_ThreadIDIntrinsic(x); break; case vmIntrinsics::_classID: do_ClassIDIntrinsic(x); break; case vmIntrinsics::_counterTime: do_RuntimeCall(CAST_FROM_FN_PTR(address, TRACE_TIME_METHOD), 0, x); break; #endif case vmIntrinsics::_currentTimeMillis: do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeMillis), 0, x); break; case vmIntrinsics::_nanoTime: do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeNanos), 0, x); break; case vmIntrinsics::_Object_init: do_RegisterFinalizer(x); break; case vmIntrinsics::_isInstance: do_isInstance(x); break; case vmIntrinsics::_getClass: do_getClass(x); break; case vmIntrinsics::_currentThread: do_currentThread(x); break; case vmIntrinsics::_dlog: // fall through case vmIntrinsics::_dlog10: // fall through case vmIntrinsics::_dabs: // fall through case vmIntrinsics::_dsqrt: // fall through case vmIntrinsics::_dtan: // fall through case vmIntrinsics::_dsin : // fall through case vmIntrinsics::_dcos : // fall through case vmIntrinsics::_dexp : // fall through case vmIntrinsics::_dpow : do_MathIntrinsic(x); break; case vmIntrinsics::_arraycopy: do_ArrayCopy(x); break; // java.nio.Buffer.checkIndex case vmIntrinsics::_checkIndex: do_NIOCheckIndex(x); break; case vmIntrinsics::_compareAndSwapObject: do_CompareAndSwap(x, objectType); break; case vmIntrinsics::_compareAndSwapInt: do_CompareAndSwap(x, intType); break; case vmIntrinsics::_compareAndSwapLong: do_CompareAndSwap(x, longType); break; case vmIntrinsics::_loadFence : if (os::is_MP()) __ membar_acquire(); break; case vmIntrinsics::_storeFence: if (os::is_MP()) __ membar_release(); break; case vmIntrinsics::_fullFence : if (os::is_MP()) __ membar(); break; case vmIntrinsics::_Reference_get: do_Reference_get(x); break; case vmIntrinsics::_updateCRC32: case vmIntrinsics::_updateBytesCRC32: case vmIntrinsics::_updateByteBufferCRC32: do_update_CRC32(x); break; default: ShouldNotReachHere(); break; } } void LIRGenerator::profile_arguments(ProfileCall* x) { if (compilation()->profile_arguments()) { int bci = x->bci_of_invoke(); ciMethodData* md = x->method()->method_data_or_null(); ciProfileData* data = md->bci_to_data(bci); if ((data->is_CallTypeData() && data->as_CallTypeData()->has_arguments()) || (data->is_VirtualCallTypeData() && data->as_VirtualCallTypeData()->has_arguments())) { ByteSize extra = data->is_CallTypeData() ? CallTypeData::args_data_offset() : VirtualCallTypeData::args_data_offset(); int base_offset = md->byte_offset_of_slot(data, extra); LIR_Opr mdp = LIR_OprFact::illegalOpr; ciTypeStackSlotEntries* args = data->is_CallTypeData() ? ((ciCallTypeData*)data)->args() : ((ciVirtualCallTypeData*)data)->args(); Bytecodes::Code bc = x->method()->java_code_at_bci(bci); int start = 0; int stop = data->is_CallTypeData() ? ((ciCallTypeData*)data)->number_of_arguments() : ((ciVirtualCallTypeData*)data)->number_of_arguments(); if (x->inlined() && x->callee()->is_static() && Bytecodes::has_receiver(bc)) { // first argument is not profiled at call (method handle invoke) assert(x->method()->raw_code_at_bci(bci) == Bytecodes::_invokehandle, "invokehandle expected"); start = 1; } ciSignature* callee_signature = x->callee()->signature(); // method handle call to virtual method bool has_receiver = x->inlined() && !x->callee()->is_static() && !Bytecodes::has_receiver(bc); ciSignatureStream callee_signature_stream(callee_signature, has_receiver ? x->callee()->holder() : NULL); bool ignored_will_link; ciSignature* signature_at_call = NULL; x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); ciSignatureStream signature_at_call_stream(signature_at_call); // if called through method handle invoke, some arguments may have been popped for (int i = 0; i < stop && i+start < x->nb_profiled_args(); i++) { int off = in_bytes(TypeEntriesAtCall::argument_type_offset(i)) - in_bytes(TypeEntriesAtCall::args_data_offset()); ciKlass* exact = profile_type(md, base_offset, off, args->type(i), x->profiled_arg_at(i+start), mdp, !x->arg_needs_null_check(i+start), signature_at_call_stream.next_klass(), callee_signature_stream.next_klass()); if (exact != NULL) { md->set_argument_type(bci, i, exact); } } } else { #ifdef ASSERT Bytecodes::Code code = x->method()->raw_code_at_bci(x->bci_of_invoke()); int n = x->nb_profiled_args(); assert(MethodData::profile_parameters() && (MethodData::profile_arguments_jsr292_only() || (x->inlined() && ((code == Bytecodes::_invokedynamic && n <= 1) || (code == Bytecodes::_invokehandle && n <= 2)))), "only at JSR292 bytecodes"); #endif } } } // profile parameters on entry to an inlined method void LIRGenerator::profile_parameters_at_call(ProfileCall* x) { if (compilation()->profile_parameters() && x->inlined()) { ciMethodData* md = x->callee()->method_data_or_null(); if (md != NULL) { ciParametersTypeData* parameters_type_data = md->parameters_type_data(); if (parameters_type_data != NULL) { ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); LIR_Opr mdp = LIR_OprFact::illegalOpr; bool has_receiver = !x->callee()->is_static(); ciSignature* sig = x->callee()->signature(); ciSignatureStream sig_stream(sig, has_receiver ? x->callee()->holder() : NULL); int i = 0; // to iterate on the Instructions Value arg = x->recv(); bool not_null = false; int bci = x->bci_of_invoke(); Bytecodes::Code bc = x->method()->java_code_at_bci(bci); // The first parameter is the receiver so that's what we start // with if it exists. One exception is method handle call to // virtual method: the receiver is in the args list if (arg == NULL || !Bytecodes::has_receiver(bc)) { i = 1; arg = x->profiled_arg_at(0); not_null = !x->arg_needs_null_check(0); } int k = 0; // to iterate on the profile data for (;;) { intptr_t profiled_k = parameters->type(k); ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), in_bytes(ParametersTypeData::type_offset(k)) - in_bytes(ParametersTypeData::type_offset(0)), profiled_k, arg, mdp, not_null, sig_stream.next_klass(), NULL); // If the profile is known statically set it once for all and do not emit any code if (exact != NULL) { md->set_parameter_type(k, exact); } k++; if (k >= parameters_type_data->number_of_parameters()) { #ifdef ASSERT int extra = 0; if (MethodData::profile_arguments() && TypeProfileParmsLimit != -1 && x->nb_profiled_args() >= TypeProfileParmsLimit && x->recv() != NULL && Bytecodes::has_receiver(bc)) { extra += 1; } assert(i == x->nb_profiled_args() - extra || (TypeProfileParmsLimit != -1 && TypeProfileArgsLimit > TypeProfileParmsLimit), "unused parameters?"); #endif break; } arg = x->profiled_arg_at(i); not_null = !x->arg_needs_null_check(i); i++; } } } } } void LIRGenerator::do_ProfileCall(ProfileCall* x) { // Need recv in a temporary register so it interferes with the other temporaries LIR_Opr recv = LIR_OprFact::illegalOpr; LIR_Opr mdo = new_register(T_OBJECT); // tmp is used to hold the counters on SPARC LIR_Opr tmp = new_pointer_register(); if (x->nb_profiled_args() > 0) { profile_arguments(x); } // profile parameters on inlined method entry including receiver if (x->recv() != NULL || x->nb_profiled_args() > 0) { profile_parameters_at_call(x); } if (x->recv() != NULL) { LIRItem value(x->recv(), this); value.load_item(); recv = new_register(T_OBJECT); __ move(value.result(), recv); } __ profile_call(x->method(), x->bci_of_invoke(), x->callee(), mdo, recv, tmp, x->known_holder()); } void LIRGenerator::do_ProfileReturnType(ProfileReturnType* x) { int bci = x->bci_of_invoke(); ciMethodData* md = x->method()->method_data_or_null(); ciProfileData* data = md->bci_to_data(bci); assert(data->is_CallTypeData() || data->is_VirtualCallTypeData(), "wrong profile data type"); ciReturnTypeEntry* ret = data->is_CallTypeData() ? ((ciCallTypeData*)data)->ret() : ((ciVirtualCallTypeData*)data)->ret(); LIR_Opr mdp = LIR_OprFact::illegalOpr; bool ignored_will_link; ciSignature* signature_at_call = NULL; x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); // The offset within the MDO of the entry to update may be too large // to be used in load/store instructions on some platforms. So have // profile_type() compute the address of the profile in a register. ciKlass* exact = profile_type(md, md->byte_offset_of_slot(data, ret->type_offset()), 0, ret->type(), x->ret(), mdp, !x->needs_null_check(), signature_at_call->return_type()->as_klass(), x->callee()->signature()->return_type()->as_klass()); if (exact != NULL) { md->set_return_type(bci, exact); } } void LIRGenerator::do_ProfileInvoke(ProfileInvoke* x) { // We can safely ignore accessors here, since c2 will inline them anyway, // accessors are also always mature. if (!x->inlinee()->is_accessor()) { CodeEmitInfo* info = state_for(x, x->state(), true); // Notify the runtime very infrequently only to take care of counter overflows increment_event_counter_impl(info, x->inlinee(), (1 << Tier23InlineeNotifyFreqLog) - 1, InvocationEntryBci, false, true); } } void LIRGenerator::increment_event_counter(CodeEmitInfo* info, int bci, bool backedge) { int freq_log; int level = compilation()->env()->comp_level(); if (level == CompLevel_limited_profile) { freq_log = (backedge ? Tier2BackedgeNotifyFreqLog : Tier2InvokeNotifyFreqLog); } else if (level == CompLevel_full_profile) { freq_log = (backedge ? Tier3BackedgeNotifyFreqLog : Tier3InvokeNotifyFreqLog); } else { ShouldNotReachHere(); } // Increment the appropriate invocation/backedge counter and notify the runtime. increment_event_counter_impl(info, info->scope()->method(), (1 << freq_log) - 1, bci, backedge, true); } void LIRGenerator::increment_event_counter_impl(CodeEmitInfo* info, ciMethod *method, int frequency, int bci, bool backedge, bool notify) { assert(frequency == 0 || is_power_of_2(frequency + 1), "Frequency must be x^2 - 1 or 0"); int level = _compilation->env()->comp_level(); assert(level > CompLevel_simple, "Shouldn't be here"); int offset = -1; LIR_Opr counter_holder; if (level == CompLevel_limited_profile) { MethodCounters* counters_adr = method->ensure_method_counters(); if (counters_adr == NULL) { bailout("method counters allocation failed"); return; } counter_holder = new_pointer_register(); __ move(LIR_OprFact::intptrConst(counters_adr), counter_holder); offset = in_bytes(backedge ? MethodCounters::backedge_counter_offset() : MethodCounters::invocation_counter_offset()); } else if (level == CompLevel_full_profile) { counter_holder = new_register(T_METADATA); offset = in_bytes(backedge ? MethodData::backedge_counter_offset() : MethodData::invocation_counter_offset()); ciMethodData* md = method->method_data_or_null(); assert(md != NULL, "Sanity"); __ metadata2reg(md->constant_encoding(), counter_holder); } else { ShouldNotReachHere(); } LIR_Address* counter = new LIR_Address(counter_holder, offset, T_INT); LIR_Opr result = new_register(T_INT); __ load(counter, result); __ add(result, LIR_OprFact::intConst(InvocationCounter::count_increment), result); __ store(result, counter); if (notify) { LIR_Opr mask = load_immediate(frequency << InvocationCounter::count_shift, T_INT); LIR_Opr meth = new_register(T_METADATA); __ metadata2reg(method->constant_encoding(), meth); __ logical_and(result, mask, result); __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0)); // The bci for info can point to cmp for if's we want the if bci CodeStub* overflow = new CounterOverflowStub(info, bci, meth); __ branch(lir_cond_equal, T_INT, overflow); __ branch_destination(overflow->continuation()); } } void LIRGenerator::do_RuntimeCall(RuntimeCall* x) { LIR_OprList* args = new LIR_OprList(x->number_of_arguments()); BasicTypeList* signature = new BasicTypeList(x->number_of_arguments()); if (x->pass_thread()) { signature->append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread args->append(getThreadPointer()); } for (int i = 0; i < x->number_of_arguments(); i++) { Value a = x->argument_at(i); LIRItem* item = new LIRItem(a, this); item->load_item(); args->append(item->result()); signature->append(as_BasicType(a->type())); } LIR_Opr result = call_runtime(signature, args, x->entry(), x->type(), NULL); if (x->type() == voidType) { set_no_result(x); } else { __ move(result, rlock_result(x)); } } #ifdef ASSERT void LIRGenerator::do_Assert(Assert *x) { ValueTag tag = x->x()->type()->tag(); If::Condition cond = x->cond(); LIRItem xitem(x->x(), this); LIRItem yitem(x->y(), this); LIRItem* xin = &xitem; LIRItem* yin = &yitem; assert(tag == intTag, "Only integer assertions are valid!"); xin->load_item(); yin->dont_load_item(); set_no_result(x); LIR_Opr left = xin->result(); LIR_Opr right = yin->result(); __ lir_assert(lir_cond(x->cond()), left, right, x->message(), true); } #endif void LIRGenerator::do_RangeCheckPredicate(RangeCheckPredicate *x) { Instruction *a = x->x(); Instruction *b = x->y(); if (!a || StressRangeCheckElimination) { assert(!b || StressRangeCheckElimination, "B must also be null"); CodeEmitInfo *info = state_for(x, x->state()); CodeStub* stub = new PredicateFailedStub(info); __ jump(stub); } else if (a->type()->as_IntConstant() && b->type()->as_IntConstant()) { int a_int = a->type()->as_IntConstant()->value(); int b_int = b->type()->as_IntConstant()->value(); bool ok = false; switch(x->cond()) { case Instruction::eql: ok = (a_int == b_int); break; case Instruction::neq: ok = (a_int != b_int); break; case Instruction::lss: ok = (a_int < b_int); break; case Instruction::leq: ok = (a_int <= b_int); break; case Instruction::gtr: ok = (a_int > b_int); break; case Instruction::geq: ok = (a_int >= b_int); break; case Instruction::aeq: ok = ((unsigned int)a_int >= (unsigned int)b_int); break; case Instruction::beq: ok = ((unsigned int)a_int <= (unsigned int)b_int); break; default: ShouldNotReachHere(); } if (ok) { CodeEmitInfo *info = state_for(x, x->state()); CodeStub* stub = new PredicateFailedStub(info); __ jump(stub); } } else { ValueTag tag = x->x()->type()->tag(); If::Condition cond = x->cond(); LIRItem xitem(x->x(), this); LIRItem yitem(x->y(), this); LIRItem* xin = &xitem; LIRItem* yin = &yitem; assert(tag == intTag, "Only integer deoptimizations are valid!"); xin->load_item(); yin->dont_load_item(); set_no_result(x); LIR_Opr left = xin->result(); LIR_Opr right = yin->result(); CodeEmitInfo *info = state_for(x, x->state()); CodeStub* stub = new PredicateFailedStub(info); __ cmp(lir_cond(cond), left, right); __ branch(lir_cond(cond), right->type(), stub); } } LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) { LIRItemList args(1); LIRItem value(arg1, this); args.append(&value); BasicTypeList signature; signature.append(as_BasicType(arg1->type())); return call_runtime(&signature, &args, entry, result_type, info); } LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) { LIRItemList args(2); LIRItem value1(arg1, this); LIRItem value2(arg2, this); args.append(&value1); args.append(&value2); BasicTypeList signature; signature.append(as_BasicType(arg1->type())); signature.append(as_BasicType(arg2->type())); return call_runtime(&signature, &args, entry, result_type, info); } LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args, address entry, ValueType* result_type, CodeEmitInfo* info) { // get a result register LIR_Opr phys_reg = LIR_OprFact::illegalOpr; LIR_Opr result = LIR_OprFact::illegalOpr; if (result_type->tag() != voidTag) { result = new_register(result_type); phys_reg = result_register_for(result_type); } // move the arguments into the correct location CallingConvention* cc = frame_map()->c_calling_convention(signature); assert(cc->length() == args->length(), "argument mismatch"); for (int i = 0; i < args->length(); i++) { LIR_Opr arg = args->at(i); LIR_Opr loc = cc->at(i); if (loc->is_register()) { __ move(arg, loc); } else { LIR_Address* addr = loc->as_address_ptr(); // if (!can_store_as_constant(arg)) { // LIR_Opr tmp = new_register(arg->type()); // __ move(arg, tmp); // arg = tmp; // } if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { __ unaligned_move(arg, addr); } else { __ move(arg, addr); } } } if (info) { __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); } else { __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); } if (result->is_valid()) { __ move(phys_reg, result); } return result; } LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args, address entry, ValueType* result_type, CodeEmitInfo* info) { // get a result register LIR_Opr phys_reg = LIR_OprFact::illegalOpr; LIR_Opr result = LIR_OprFact::illegalOpr; if (result_type->tag() != voidTag) { result = new_register(result_type); phys_reg = result_register_for(result_type); } // move the arguments into the correct location CallingConvention* cc = frame_map()->c_calling_convention(signature); assert(cc->length() == args->length(), "argument mismatch"); for (int i = 0; i < args->length(); i++) { LIRItem* arg = args->at(i); LIR_Opr loc = cc->at(i); if (loc->is_register()) { arg->load_item_force(loc); } else { LIR_Address* addr = loc->as_address_ptr(); arg->load_for_store(addr->type()); if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { __ unaligned_move(arg->result(), addr); } else { __ move(arg->result(), addr); } } } if (info) { __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); } else { __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); } if (result->is_valid()) { __ move(phys_reg, result); } return result; } void LIRGenerator::do_MemBar(MemBar* x) { if (os::is_MP()) { LIR_Code code = x->code(); switch(code) { case lir_membar_acquire : __ membar_acquire(); break; case lir_membar_release : __ membar_release(); break; case lir_membar : __ membar(); break; case lir_membar_loadload : __ membar_loadload(); break; case lir_membar_storestore: __ membar_storestore(); break; case lir_membar_loadstore : __ membar_loadstore(); break; case lir_membar_storeload : __ membar_storeload(); break; default : ShouldNotReachHere(); break; } } }