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/*
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* Copyright 1999-2010 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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#include "incls/_precompiled.incl"
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#include "incls/_c1_Instruction.cpp.incl"
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// Implementation of Instruction
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int Instruction::_next_id = 0;
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#ifdef ASSERT
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void Instruction::create_hi_word() {
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assert(type()->is_double_word() && _hi_word == NULL, "only double word has high word");
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_hi_word = new HiWord(this);
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}
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#endif
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Instruction::Condition Instruction::mirror(Condition cond) {
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switch (cond) {
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case eql: return eql;
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case neq: return neq;
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case lss: return gtr;
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case leq: return geq;
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case gtr: return lss;
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case geq: return leq;
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}
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ShouldNotReachHere();
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return eql;
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}
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Instruction::Condition Instruction::negate(Condition cond) {
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switch (cond) {
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case eql: return neq;
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case neq: return eql;
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case lss: return geq;
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case leq: return gtr;
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case gtr: return leq;
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case geq: return lss;
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}
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ShouldNotReachHere();
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return eql;
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}
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Instruction* Instruction::prev(BlockBegin* block) {
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Instruction* p = NULL;
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Instruction* q = block;
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while (q != this) {
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assert(q != NULL, "this is not in the block's instruction list");
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p = q; q = q->next();
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}
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return p;
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}
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#ifndef PRODUCT
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void Instruction::print() {
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InstructionPrinter ip;
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print(ip);
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}
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void Instruction::print_line() {
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InstructionPrinter ip;
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ip.print_line(this);
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}
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void Instruction::print(InstructionPrinter& ip) {
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ip.print_head();
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ip.print_line(this);
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tty->cr();
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}
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#endif // PRODUCT
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// perform constant and interval tests on index value
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bool AccessIndexed::compute_needs_range_check() {
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Constant* clength = length()->as_Constant();
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Constant* cindex = index()->as_Constant();
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if (clength && cindex) {
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IntConstant* l = clength->type()->as_IntConstant();
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IntConstant* i = cindex->type()->as_IntConstant();
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if (l && i && i->value() < l->value() && i->value() >= 0) {
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return false;
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}
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}
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return true;
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}
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ciType* LoadIndexed::exact_type() const {
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ciType* array_type = array()->exact_type();
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if (array_type == NULL) {
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return NULL;
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}
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assert(array_type->is_array_klass(), "what else?");
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ciArrayKlass* ak = (ciArrayKlass*)array_type;
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if (ak->element_type()->is_instance_klass()) {
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ciInstanceKlass* ik = (ciInstanceKlass*)ak->element_type();
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if (ik->is_loaded() && ik->is_final()) {
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return ik;
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}
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}
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return NULL;
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}
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ciType* LoadIndexed::declared_type() const {
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ciType* array_type = array()->declared_type();
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if (array_type == NULL) {
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return NULL;
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}
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assert(array_type->is_array_klass(), "what else?");
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ciArrayKlass* ak = (ciArrayKlass*)array_type;
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return ak->element_type();
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}
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ciType* LoadField::declared_type() const {
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return field()->type();
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}
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ciType* LoadField::exact_type() const {
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ciType* type = declared_type();
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// for primitive arrays, the declared type is the exact type
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if (type->is_type_array_klass()) {
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return type;
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}
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if (type->is_instance_klass()) {
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ciInstanceKlass* ik = (ciInstanceKlass*)type;
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if (ik->is_loaded() && ik->is_final()) {
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return type;
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}
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}
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return NULL;
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}
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ciType* NewTypeArray::exact_type() const {
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return ciTypeArrayKlass::make(elt_type());
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}
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ciType* NewObjectArray::exact_type() const {
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return ciObjArrayKlass::make(klass());
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}
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ciType* NewInstance::exact_type() const {
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return klass();
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}
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ciType* CheckCast::declared_type() const {
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return klass();
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}
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ciType* CheckCast::exact_type() const {
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if (klass()->is_instance_klass()) {
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ciInstanceKlass* ik = (ciInstanceKlass*)klass();
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if (ik->is_loaded() && ik->is_final()) {
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return ik;
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}
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}
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return NULL;
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}
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void ArithmeticOp::other_values_do(void f(Value*)) {
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if (lock_stack() != NULL) lock_stack()->values_do(f);
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}
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void NullCheck::other_values_do(void f(Value*)) {
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lock_stack()->values_do(f);
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}
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void AccessArray::other_values_do(void f(Value*)) {
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if (lock_stack() != NULL) lock_stack()->values_do(f);
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}
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// Implementation of AccessField
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void AccessField::other_values_do(void f(Value*)) {
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if (state_before() != NULL) state_before()->values_do(f);
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if (lock_stack() != NULL) lock_stack()->values_do(f);
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}
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// Implementation of StoreIndexed
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IRScope* StoreIndexed::scope() const {
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return lock_stack()->scope();
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}
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// Implementation of ArithmeticOp
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bool ArithmeticOp::is_commutative() const {
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switch (op()) {
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case Bytecodes::_iadd: // fall through
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case Bytecodes::_ladd: // fall through
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case Bytecodes::_fadd: // fall through
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case Bytecodes::_dadd: // fall through
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case Bytecodes::_imul: // fall through
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case Bytecodes::_lmul: // fall through
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case Bytecodes::_fmul: // fall through
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case Bytecodes::_dmul: return true;
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}
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return false;
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}
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bool ArithmeticOp::can_trap() const {
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switch (op()) {
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case Bytecodes::_idiv: // fall through
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case Bytecodes::_ldiv: // fall through
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case Bytecodes::_irem: // fall through
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case Bytecodes::_lrem: return true;
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}
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return false;
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}
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// Implementation of LogicOp
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bool LogicOp::is_commutative() const {
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#ifdef ASSERT
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switch (op()) {
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case Bytecodes::_iand: // fall through
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case Bytecodes::_land: // fall through
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case Bytecodes::_ior : // fall through
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case Bytecodes::_lor : // fall through
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case Bytecodes::_ixor: // fall through
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case Bytecodes::_lxor: break;
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default : ShouldNotReachHere();
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}
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#endif
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// all LogicOps are commutative
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return true;
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}
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// Implementation of CompareOp
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void CompareOp::other_values_do(void f(Value*)) {
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if (state_before() != NULL) state_before()->values_do(f);
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}
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// Implementation of IfOp
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bool IfOp::is_commutative() const {
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return cond() == eql || cond() == neq;
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}
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// Implementation of StateSplit
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void StateSplit::substitute(BlockList& list, BlockBegin* old_block, BlockBegin* new_block) {
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NOT_PRODUCT(bool assigned = false;)
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for (int i = 0; i < list.length(); i++) {
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BlockBegin** b = list.adr_at(i);
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if (*b == old_block) {
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*b = new_block;
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NOT_PRODUCT(assigned = true;)
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}
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}
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assert(assigned == true, "should have assigned at least once");
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}
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IRScope* StateSplit::scope() const {
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return _state->scope();
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}
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void StateSplit::state_values_do(void f(Value*)) {
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if (state() != NULL) state()->values_do(f);
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}
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void BlockBegin::state_values_do(void f(Value*)) {
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StateSplit::state_values_do(f);
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if (is_set(BlockBegin::exception_entry_flag)) {
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for (int i = 0; i < number_of_exception_states(); i++) {
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exception_state_at(i)->values_do(f);
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}
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}
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}
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void MonitorEnter::state_values_do(void f(Value*)) {
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StateSplit::state_values_do(f);
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_lock_stack_before->values_do(f);
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}
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void Intrinsic::state_values_do(void f(Value*)) {
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StateSplit::state_values_do(f);
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if (lock_stack() != NULL) lock_stack()->values_do(f);
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}
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// Implementation of Invoke
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Invoke::Invoke(Bytecodes::Code code, ValueType* result_type, Value recv, Values* args,
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int vtable_index, ciMethod* target, ValueStack* state_before)
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1
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: StateSplit(result_type)
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, _code(code)
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, _recv(recv)
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, _args(args)
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, _vtable_index(vtable_index)
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, _target(target)
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, _state_before(state_before)
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{
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set_flag(TargetIsLoadedFlag, target->is_loaded());
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set_flag(TargetIsFinalFlag, target_is_loaded() && target->is_final_method());
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set_flag(TargetIsStrictfpFlag, target_is_loaded() && target->is_strict());
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assert(args != NULL, "args must exist");
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#ifdef ASSERT
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values_do(assert_value);
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#endif // ASSERT
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// provide an initial guess of signature size.
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_signature = new BasicTypeList(number_of_arguments() + (has_receiver() ? 1 : 0));
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if (has_receiver()) {
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_signature->append(as_BasicType(receiver()->type()));
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} else if (is_invokedynamic()) {
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// Add the synthetic MethodHandle argument to the signature.
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_signature->append(T_OBJECT);
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1
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}
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for (int i = 0; i < number_of_arguments(); i++) {
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ValueType* t = argument_at(i)->type();
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BasicType bt = as_BasicType(t);
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_signature->append(bt);
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}
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}
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void Invoke::state_values_do(void f(Value*)) {
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StateSplit::state_values_do(f);
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if (state_before() != NULL) state_before()->values_do(f);
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if (state() != NULL) state()->values_do(f);
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}
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1
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// Implementation of Contant
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379 |
intx Constant::hash() const {
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if (_state == NULL) {
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switch (type()->tag()) {
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case intTag:
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return HASH2(name(), type()->as_IntConstant()->value());
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|
|
384 |
case longTag:
|
|
|
385 |
{
|
|
|
386 |
jlong temp = type()->as_LongConstant()->value();
|
|
|
387 |
return HASH3(name(), high(temp), low(temp));
|
|
|
388 |
}
|
|
|
389 |
case floatTag:
|
|
|
390 |
return HASH2(name(), jint_cast(type()->as_FloatConstant()->value()));
|
|
|
391 |
case doubleTag:
|
|
|
392 |
{
|
|
|
393 |
jlong temp = jlong_cast(type()->as_DoubleConstant()->value());
|
|
|
394 |
return HASH3(name(), high(temp), low(temp));
|
|
|
395 |
}
|
|
|
396 |
case objectTag:
|
|
|
397 |
assert(type()->as_ObjectType()->is_loaded(), "can't handle unloaded values");
|
|
|
398 |
return HASH2(name(), type()->as_ObjectType()->constant_value());
|
|
|
399 |
}
|
|
|
400 |
}
|
|
|
401 |
return 0;
|
|
|
402 |
}
|
|
|
403 |
|
|
|
404 |
bool Constant::is_equal(Value v) const {
|
|
|
405 |
if (v->as_Constant() == NULL) return false;
|
|
|
406 |
|
|
|
407 |
switch (type()->tag()) {
|
|
|
408 |
case intTag:
|
|
|
409 |
{
|
|
|
410 |
IntConstant* t1 = type()->as_IntConstant();
|
|
|
411 |
IntConstant* t2 = v->type()->as_IntConstant();
|
|
|
412 |
return (t1 != NULL && t2 != NULL &&
|
|
|
413 |
t1->value() == t2->value());
|
|
|
414 |
}
|
|
|
415 |
case longTag:
|
|
|
416 |
{
|
|
|
417 |
LongConstant* t1 = type()->as_LongConstant();
|
|
|
418 |
LongConstant* t2 = v->type()->as_LongConstant();
|
|
|
419 |
return (t1 != NULL && t2 != NULL &&
|
|
|
420 |
t1->value() == t2->value());
|
|
|
421 |
}
|
|
|
422 |
case floatTag:
|
|
|
423 |
{
|
|
|
424 |
FloatConstant* t1 = type()->as_FloatConstant();
|
|
|
425 |
FloatConstant* t2 = v->type()->as_FloatConstant();
|
|
|
426 |
return (t1 != NULL && t2 != NULL &&
|
|
|
427 |
jint_cast(t1->value()) == jint_cast(t2->value()));
|
|
|
428 |
}
|
|
|
429 |
case doubleTag:
|
|
|
430 |
{
|
|
|
431 |
DoubleConstant* t1 = type()->as_DoubleConstant();
|
|
|
432 |
DoubleConstant* t2 = v->type()->as_DoubleConstant();
|
|
|
433 |
return (t1 != NULL && t2 != NULL &&
|
|
|
434 |
jlong_cast(t1->value()) == jlong_cast(t2->value()));
|
|
|
435 |
}
|
|
|
436 |
case objectTag:
|
|
|
437 |
{
|
|
|
438 |
ObjectType* t1 = type()->as_ObjectType();
|
|
|
439 |
ObjectType* t2 = v->type()->as_ObjectType();
|
|
|
440 |
return (t1 != NULL && t2 != NULL &&
|
|
|
441 |
t1->is_loaded() && t2->is_loaded() &&
|
|
|
442 |
t1->constant_value() == t2->constant_value());
|
|
|
443 |
}
|
|
|
444 |
}
|
|
|
445 |
return false;
|
|
|
446 |
}
|
|
|
447 |
|
|
|
448 |
|
|
|
449 |
BlockBegin* Constant::compare(Instruction::Condition cond, Value right,
|
|
|
450 |
BlockBegin* true_sux, BlockBegin* false_sux) {
|
|
|
451 |
Constant* rc = right->as_Constant();
|
|
|
452 |
// other is not a constant
|
|
|
453 |
if (rc == NULL) return NULL;
|
|
|
454 |
|
|
|
455 |
ValueType* lt = type();
|
|
|
456 |
ValueType* rt = rc->type();
|
|
|
457 |
// different types
|
|
|
458 |
if (lt->base() != rt->base()) return NULL;
|
|
|
459 |
switch (lt->tag()) {
|
|
|
460 |
case intTag: {
|
|
|
461 |
int x = lt->as_IntConstant()->value();
|
|
|
462 |
int y = rt->as_IntConstant()->value();
|
|
|
463 |
switch (cond) {
|
|
|
464 |
case If::eql: return x == y ? true_sux : false_sux;
|
|
|
465 |
case If::neq: return x != y ? true_sux : false_sux;
|
|
|
466 |
case If::lss: return x < y ? true_sux : false_sux;
|
|
|
467 |
case If::leq: return x <= y ? true_sux : false_sux;
|
|
|
468 |
case If::gtr: return x > y ? true_sux : false_sux;
|
|
|
469 |
case If::geq: return x >= y ? true_sux : false_sux;
|
|
|
470 |
}
|
|
|
471 |
break;
|
|
|
472 |
}
|
|
|
473 |
case longTag: {
|
|
|
474 |
jlong x = lt->as_LongConstant()->value();
|
|
|
475 |
jlong y = rt->as_LongConstant()->value();
|
|
|
476 |
switch (cond) {
|
|
|
477 |
case If::eql: return x == y ? true_sux : false_sux;
|
|
|
478 |
case If::neq: return x != y ? true_sux : false_sux;
|
|
|
479 |
case If::lss: return x < y ? true_sux : false_sux;
|
|
|
480 |
case If::leq: return x <= y ? true_sux : false_sux;
|
|
|
481 |
case If::gtr: return x > y ? true_sux : false_sux;
|
|
|
482 |
case If::geq: return x >= y ? true_sux : false_sux;
|
|
|
483 |
}
|
|
|
484 |
break;
|
|
|
485 |
}
|
|
|
486 |
case objectTag: {
|
|
|
487 |
ciObject* xvalue = lt->as_ObjectType()->constant_value();
|
|
|
488 |
ciObject* yvalue = rt->as_ObjectType()->constant_value();
|
|
|
489 |
assert(xvalue != NULL && yvalue != NULL, "not constants");
|
|
|
490 |
if (xvalue->is_loaded() && yvalue->is_loaded()) {
|
|
|
491 |
switch (cond) {
|
|
|
492 |
case If::eql: return xvalue == yvalue ? true_sux : false_sux;
|
|
|
493 |
case If::neq: return xvalue != yvalue ? true_sux : false_sux;
|
|
|
494 |
}
|
|
|
495 |
}
|
|
|
496 |
break;
|
|
|
497 |
}
|
|
|
498 |
}
|
|
|
499 |
return NULL;
|
|
|
500 |
}
|
|
|
501 |
|
|
|
502 |
|
|
|
503 |
void Constant::other_values_do(void f(Value*)) {
|
|
|
504 |
if (state() != NULL) state()->values_do(f);
|
|
|
505 |
}
|
|
|
506 |
|
|
|
507 |
|
|
|
508 |
// Implementation of NewArray
|
|
|
509 |
|
|
|
510 |
void NewArray::other_values_do(void f(Value*)) {
|
|
|
511 |
if (state_before() != NULL) state_before()->values_do(f);
|
|
|
512 |
}
|
|
|
513 |
|
|
|
514 |
|
|
|
515 |
// Implementation of TypeCheck
|
|
|
516 |
|
|
|
517 |
void TypeCheck::other_values_do(void f(Value*)) {
|
|
|
518 |
if (state_before() != NULL) state_before()->values_do(f);
|
|
|
519 |
}
|
|
|
520 |
|
|
|
521 |
|
|
|
522 |
// Implementation of BlockBegin
|
|
|
523 |
|
|
|
524 |
int BlockBegin::_next_block_id = 0;
|
|
|
525 |
|
|
|
526 |
|
|
|
527 |
void BlockBegin::set_end(BlockEnd* end) {
|
|
|
528 |
assert(end != NULL, "should not reset block end to NULL");
|
|
|
529 |
BlockEnd* old_end = _end;
|
|
|
530 |
if (end == old_end) {
|
|
|
531 |
return;
|
|
|
532 |
}
|
|
|
533 |
// Must make the predecessors/successors match up with the
|
|
|
534 |
// BlockEnd's notion.
|
|
|
535 |
int i, n;
|
|
|
536 |
if (old_end != NULL) {
|
|
|
537 |
// disconnect from the old end
|
|
|
538 |
old_end->set_begin(NULL);
|
|
|
539 |
|
|
|
540 |
// disconnect this block from it's current successors
|
|
|
541 |
for (i = 0; i < _successors.length(); i++) {
|
|
|
542 |
_successors.at(i)->remove_predecessor(this);
|
|
|
543 |
}
|
|
|
544 |
}
|
|
|
545 |
_end = end;
|
|
|
546 |
|
|
|
547 |
_successors.clear();
|
|
|
548 |
// Now reset successors list based on BlockEnd
|
|
|
549 |
n = end->number_of_sux();
|
|
|
550 |
for (i = 0; i < n; i++) {
|
|
|
551 |
BlockBegin* sux = end->sux_at(i);
|
|
|
552 |
_successors.append(sux);
|
|
|
553 |
sux->_predecessors.append(this);
|
|
|
554 |
}
|
|
|
555 |
_end->set_begin(this);
|
|
|
556 |
}
|
|
|
557 |
|
|
|
558 |
|
|
|
559 |
void BlockBegin::disconnect_edge(BlockBegin* from, BlockBegin* to) {
|
|
|
560 |
// disconnect any edges between from and to
|
|
|
561 |
#ifndef PRODUCT
|
|
|
562 |
if (PrintIR && Verbose) {
|
|
|
563 |
tty->print_cr("Disconnected edge B%d -> B%d", from->block_id(), to->block_id());
|
|
|
564 |
}
|
|
|
565 |
#endif
|
|
|
566 |
for (int s = 0; s < from->number_of_sux();) {
|
|
|
567 |
BlockBegin* sux = from->sux_at(s);
|
|
|
568 |
if (sux == to) {
|
|
|
569 |
int index = sux->_predecessors.index_of(from);
|
|
|
570 |
if (index >= 0) {
|
|
|
571 |
sux->_predecessors.remove_at(index);
|
|
|
572 |
}
|
|
|
573 |
from->_successors.remove_at(s);
|
|
|
574 |
} else {
|
|
|
575 |
s++;
|
|
|
576 |
}
|
|
|
577 |
}
|
|
|
578 |
}
|
|
|
579 |
|
|
|
580 |
|
|
|
581 |
void BlockBegin::disconnect_from_graph() {
|
|
|
582 |
// disconnect this block from all other blocks
|
|
|
583 |
for (int p = 0; p < number_of_preds(); p++) {
|
|
|
584 |
pred_at(p)->remove_successor(this);
|
|
|
585 |
}
|
|
|
586 |
for (int s = 0; s < number_of_sux(); s++) {
|
|
|
587 |
sux_at(s)->remove_predecessor(this);
|
|
|
588 |
}
|
|
|
589 |
}
|
|
|
590 |
|
|
|
591 |
void BlockBegin::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) {
|
|
|
592 |
// modify predecessors before substituting successors
|
|
|
593 |
for (int i = 0; i < number_of_sux(); i++) {
|
|
|
594 |
if (sux_at(i) == old_sux) {
|
|
|
595 |
// remove old predecessor before adding new predecessor
|
|
|
596 |
// otherwise there is a dead predecessor in the list
|
|
|
597 |
new_sux->remove_predecessor(old_sux);
|
|
|
598 |
new_sux->add_predecessor(this);
|
|
|
599 |
}
|
|
|
600 |
}
|
|
|
601 |
old_sux->remove_predecessor(this);
|
|
|
602 |
end()->substitute_sux(old_sux, new_sux);
|
|
|
603 |
}
|
|
|
604 |
|
|
|
605 |
|
|
|
606 |
|
|
|
607 |
// In general it is not possible to calculate a value for the field "depth_first_number"
|
|
|
608 |
// of the inserted block, without recomputing the values of the other blocks
|
|
|
609 |
// in the CFG. Therefore the value of "depth_first_number" in BlockBegin becomes meaningless.
|
|
|
610 |
BlockBegin* BlockBegin::insert_block_between(BlockBegin* sux) {
|
|
|
611 |
// Try to make the bci close to a block with a single pred or sux,
|
|
|
612 |
// since this make the block layout algorithm work better.
|
|
|
613 |
int bci = -1;
|
|
|
614 |
if (sux->number_of_preds() == 1) {
|
|
|
615 |
bci = sux->bci();
|
|
|
616 |
} else {
|
|
|
617 |
bci = end()->bci();
|
|
|
618 |
}
|
|
|
619 |
|
|
|
620 |
BlockBegin* new_sux = new BlockBegin(bci);
|
|
|
621 |
|
|
|
622 |
// mark this block (special treatment when block order is computed)
|
|
|
623 |
new_sux->set(critical_edge_split_flag);
|
|
|
624 |
|
|
|
625 |
// This goto is not a safepoint.
|
|
|
626 |
Goto* e = new Goto(sux, false);
|
|
|
627 |
new_sux->set_next(e, bci);
|
|
|
628 |
new_sux->set_end(e);
|
|
|
629 |
// setup states
|
|
|
630 |
ValueStack* s = end()->state();
|
|
|
631 |
new_sux->set_state(s->copy());
|
|
|
632 |
e->set_state(s->copy());
|
|
|
633 |
assert(new_sux->state()->locals_size() == s->locals_size(), "local size mismatch!");
|
|
|
634 |
assert(new_sux->state()->stack_size() == s->stack_size(), "stack size mismatch!");
|
|
|
635 |
assert(new_sux->state()->locks_size() == s->locks_size(), "locks size mismatch!");
|
|
|
636 |
|
|
|
637 |
// link predecessor to new block
|
|
|
638 |
end()->substitute_sux(sux, new_sux);
|
|
|
639 |
|
|
|
640 |
// The ordering needs to be the same, so remove the link that the
|
|
|
641 |
// set_end call above added and substitute the new_sux for this
|
|
|
642 |
// block.
|
|
|
643 |
sux->remove_predecessor(new_sux);
|
|
|
644 |
|
|
|
645 |
// the successor could be the target of a switch so it might have
|
|
|
646 |
// multiple copies of this predecessor, so substitute the new_sux
|
|
|
647 |
// for the first and delete the rest.
|
|
|
648 |
bool assigned = false;
|
|
|
649 |
BlockList& list = sux->_predecessors;
|
|
|
650 |
for (int i = 0; i < list.length(); i++) {
|
|
|
651 |
BlockBegin** b = list.adr_at(i);
|
|
|
652 |
if (*b == this) {
|
|
|
653 |
if (assigned) {
|
|
|
654 |
list.remove_at(i);
|
|
|
655 |
// reprocess this index
|
|
|
656 |
i--;
|
|
|
657 |
} else {
|
|
|
658 |
assigned = true;
|
|
|
659 |
*b = new_sux;
|
|
|
660 |
}
|
|
|
661 |
// link the new block back to it's predecessors.
|
|
|
662 |
new_sux->add_predecessor(this);
|
|
|
663 |
}
|
|
|
664 |
}
|
|
|
665 |
assert(assigned == true, "should have assigned at least once");
|
|
|
666 |
return new_sux;
|
|
|
667 |
}
|
|
|
668 |
|
|
|
669 |
|
|
|
670 |
void BlockBegin::remove_successor(BlockBegin* pred) {
|
|
|
671 |
int idx;
|
|
|
672 |
while ((idx = _successors.index_of(pred)) >= 0) {
|
|
|
673 |
_successors.remove_at(idx);
|
|
|
674 |
}
|
|
|
675 |
}
|
|
|
676 |
|
|
|
677 |
|
|
|
678 |
void BlockBegin::add_predecessor(BlockBegin* pred) {
|
|
|
679 |
_predecessors.append(pred);
|
|
|
680 |
}
|
|
|
681 |
|
|
|
682 |
|
|
|
683 |
void BlockBegin::remove_predecessor(BlockBegin* pred) {
|
|
|
684 |
int idx;
|
|
|
685 |
while ((idx = _predecessors.index_of(pred)) >= 0) {
|
|
|
686 |
_predecessors.remove_at(idx);
|
|
|
687 |
}
|
|
|
688 |
}
|
|
|
689 |
|
|
|
690 |
|
|
|
691 |
void BlockBegin::add_exception_handler(BlockBegin* b) {
|
|
|
692 |
assert(b != NULL && (b->is_set(exception_entry_flag)), "exception handler must exist");
|
|
|
693 |
// add only if not in the list already
|
|
|
694 |
if (!_exception_handlers.contains(b)) _exception_handlers.append(b);
|
|
|
695 |
}
|
|
|
696 |
|
|
|
697 |
int BlockBegin::add_exception_state(ValueStack* state) {
|
|
|
698 |
assert(is_set(exception_entry_flag), "only for xhandlers");
|
|
|
699 |
if (_exception_states == NULL) {
|
|
|
700 |
_exception_states = new ValueStackStack(4);
|
|
|
701 |
}
|
|
|
702 |
_exception_states->append(state);
|
|
|
703 |
return _exception_states->length() - 1;
|
|
|
704 |
}
|
|
|
705 |
|
|
|
706 |
|
|
|
707 |
void BlockBegin::iterate_preorder(boolArray& mark, BlockClosure* closure) {
|
|
|
708 |
if (!mark.at(block_id())) {
|
|
|
709 |
mark.at_put(block_id(), true);
|
|
|
710 |
closure->block_do(this);
|
|
|
711 |
BlockEnd* e = end(); // must do this after block_do because block_do may change it!
|
|
|
712 |
{ for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_preorder(mark, closure); }
|
|
|
713 |
{ for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_preorder(mark, closure); }
|
|
|
714 |
}
|
|
|
715 |
}
|
|
|
716 |
|
|
|
717 |
|
|
|
718 |
void BlockBegin::iterate_postorder(boolArray& mark, BlockClosure* closure) {
|
|
|
719 |
if (!mark.at(block_id())) {
|
|
|
720 |
mark.at_put(block_id(), true);
|
|
|
721 |
BlockEnd* e = end();
|
|
|
722 |
{ for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_postorder(mark, closure); }
|
|
|
723 |
{ for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_postorder(mark, closure); }
|
|
|
724 |
closure->block_do(this);
|
|
|
725 |
}
|
|
|
726 |
}
|
|
|
727 |
|
|
|
728 |
|
|
|
729 |
void BlockBegin::iterate_preorder(BlockClosure* closure) {
|
|
|
730 |
boolArray mark(number_of_blocks(), false);
|
|
|
731 |
iterate_preorder(mark, closure);
|
|
|
732 |
}
|
|
|
733 |
|
|
|
734 |
|
|
|
735 |
void BlockBegin::iterate_postorder(BlockClosure* closure) {
|
|
|
736 |
boolArray mark(number_of_blocks(), false);
|
|
|
737 |
iterate_postorder(mark, closure);
|
|
|
738 |
}
|
|
|
739 |
|
|
|
740 |
|
|
|
741 |
void BlockBegin::block_values_do(void f(Value*)) {
|
|
|
742 |
for (Instruction* n = this; n != NULL; n = n->next()) n->values_do(f);
|
|
|
743 |
}
|
|
|
744 |
|
|
|
745 |
|
|
|
746 |
#ifndef PRODUCT
|
|
|
747 |
#define TRACE_PHI(code) if (PrintPhiFunctions) { code; }
|
|
|
748 |
#else
|
|
|
749 |
#define TRACE_PHI(coce)
|
|
|
750 |
#endif
|
|
|
751 |
|
|
|
752 |
|
|
|
753 |
bool BlockBegin::try_merge(ValueStack* new_state) {
|
|
|
754 |
TRACE_PHI(tty->print_cr("********** try_merge for block B%d", block_id()));
|
|
|
755 |
|
|
|
756 |
// local variables used for state iteration
|
|
|
757 |
int index;
|
|
|
758 |
Value new_value, existing_value;
|
|
|
759 |
|
|
|
760 |
ValueStack* existing_state = state();
|
|
|
761 |
if (existing_state == NULL) {
|
|
|
762 |
TRACE_PHI(tty->print_cr("first call of try_merge for this block"));
|
|
|
763 |
|
|
|
764 |
if (is_set(BlockBegin::was_visited_flag)) {
|
|
|
765 |
// this actually happens for complicated jsr/ret structures
|
|
|
766 |
return false; // BAILOUT in caller
|
|
|
767 |
}
|
|
|
768 |
|
|
|
769 |
// copy state because it is altered
|
|
|
770 |
new_state = new_state->copy();
|
|
|
771 |
|
|
|
772 |
// Use method liveness to invalidate dead locals
|
|
|
773 |
MethodLivenessResult liveness = new_state->scope()->method()->liveness_at_bci(bci());
|
|
|
774 |
if (liveness.is_valid()) {
|
|
|
775 |
assert((int)liveness.size() == new_state->locals_size(), "error in use of liveness");
|
|
|
776 |
|
|
|
777 |
for_each_local_value(new_state, index, new_value) {
|
|
|
778 |
if (!liveness.at(index) || new_value->type()->is_illegal()) {
|
|
|
779 |
new_state->invalidate_local(index);
|
|
|
780 |
TRACE_PHI(tty->print_cr("invalidating dead local %d", index));
|
|
|
781 |
}
|
|
|
782 |
}
|
|
|
783 |
}
|
|
|
784 |
|
|
|
785 |
if (is_set(BlockBegin::parser_loop_header_flag)) {
|
|
|
786 |
TRACE_PHI(tty->print_cr("loop header block, initializing phi functions"));
|
|
|
787 |
|
|
|
788 |
for_each_stack_value(new_state, index, new_value) {
|
|
|
789 |
new_state->setup_phi_for_stack(this, index);
|
|
|
790 |
TRACE_PHI(tty->print_cr("creating phi-function %c%d for stack %d", new_state->stack_at(index)->type()->tchar(), new_state->stack_at(index)->id(), index));
|
|
|
791 |
}
|
|
|
792 |
|
|
|
793 |
BitMap requires_phi_function = new_state->scope()->requires_phi_function();
|
|
|
794 |
|
|
|
795 |
for_each_local_value(new_state, index, new_value) {
|
|
|
796 |
bool requires_phi = requires_phi_function.at(index) || (new_value->type()->is_double_word() && requires_phi_function.at(index + 1));
|
|
|
797 |
if (requires_phi || !SelectivePhiFunctions) {
|
|
|
798 |
new_state->setup_phi_for_local(this, index);
|
|
|
799 |
TRACE_PHI(tty->print_cr("creating phi-function %c%d for local %d", new_state->local_at(index)->type()->tchar(), new_state->local_at(index)->id(), index));
|
|
|
800 |
}
|
|
|
801 |
}
|
|
|
802 |
}
|
|
|
803 |
|
|
|
804 |
// initialize state of block
|
|
|
805 |
set_state(new_state);
|
|
|
806 |
|
|
|
807 |
} else if (existing_state->is_same_across_scopes(new_state)) {
|
|
|
808 |
TRACE_PHI(tty->print_cr("exisiting state found"));
|
|
|
809 |
|
|
|
810 |
// Inlining may cause the local state not to match up, so walk up
|
|
|
811 |
// the new state until we get to the same scope as the
|
|
|
812 |
// existing and then start processing from there.
|
|
|
813 |
while (existing_state->scope() != new_state->scope()) {
|
|
|
814 |
new_state = new_state->caller_state();
|
|
|
815 |
assert(new_state != NULL, "could not match up scopes");
|
|
|
816 |
|
|
|
817 |
assert(false, "check if this is necessary");
|
|
|
818 |
}
|
|
|
819 |
|
|
|
820 |
assert(existing_state->scope() == new_state->scope(), "not matching");
|
|
|
821 |
assert(existing_state->locals_size() == new_state->locals_size(), "not matching");
|
|
|
822 |
assert(existing_state->stack_size() == new_state->stack_size(), "not matching");
|
|
|
823 |
|
|
|
824 |
if (is_set(BlockBegin::was_visited_flag)) {
|
|
|
825 |
TRACE_PHI(tty->print_cr("loop header block, phis must be present"));
|
|
|
826 |
|
|
|
827 |
if (!is_set(BlockBegin::parser_loop_header_flag)) {
|
|
|
828 |
// this actually happens for complicated jsr/ret structures
|
|
|
829 |
return false; // BAILOUT in caller
|
|
|
830 |
}
|
|
|
831 |
|
|
|
832 |
for_each_local_value(existing_state, index, existing_value) {
|
|
|
833 |
Value new_value = new_state->local_at(index);
|
|
|
834 |
if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) {
|
|
|
835 |
// The old code invalidated the phi function here
|
|
|
836 |
// Because dead locals are replaced with NULL, this is a very rare case now, so simply bail out
|
|
|
837 |
return false; // BAILOUT in caller
|
|
|
838 |
}
|
|
|
839 |
}
|
|
|
840 |
|
|
|
841 |
#ifdef ASSERT
|
|
|
842 |
// check that all necessary phi functions are present
|
|
|
843 |
for_each_stack_value(existing_state, index, existing_value) {
|
|
|
844 |
assert(existing_value->as_Phi() != NULL && existing_value->as_Phi()->block() == this, "phi function required");
|
|
|
845 |
}
|
|
|
846 |
for_each_local_value(existing_state, index, existing_value) {
|
|
|
847 |
assert(existing_value == new_state->local_at(index) || (existing_value->as_Phi() != NULL && existing_value->as_Phi()->as_Phi()->block() == this), "phi function required");
|
|
|
848 |
}
|
|
|
849 |
#endif
|
|
|
850 |
|
|
|
851 |
} else {
|
|
|
852 |
TRACE_PHI(tty->print_cr("creating phi functions on demand"));
|
|
|
853 |
|
|
|
854 |
// create necessary phi functions for stack
|
|
|
855 |
for_each_stack_value(existing_state, index, existing_value) {
|
|
|
856 |
Value new_value = new_state->stack_at(index);
|
|
|
857 |
Phi* existing_phi = existing_value->as_Phi();
|
|
|
858 |
|
|
|
859 |
if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) {
|
|
|
860 |
existing_state->setup_phi_for_stack(this, index);
|
|
|
861 |
TRACE_PHI(tty->print_cr("creating phi-function %c%d for stack %d", existing_state->stack_at(index)->type()->tchar(), existing_state->stack_at(index)->id(), index));
|
|
|
862 |
}
|
|
|
863 |
}
|
|
|
864 |
|
|
|
865 |
// create necessary phi functions for locals
|
|
|
866 |
for_each_local_value(existing_state, index, existing_value) {
|
|
|
867 |
Value new_value = new_state->local_at(index);
|
|
|
868 |
Phi* existing_phi = existing_value->as_Phi();
|
|
|
869 |
|
|
|
870 |
if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) {
|
|
|
871 |
existing_state->invalidate_local(index);
|
|
|
872 |
TRACE_PHI(tty->print_cr("invalidating local %d because of type mismatch", index));
|
|
|
873 |
} else if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) {
|
|
|
874 |
existing_state->setup_phi_for_local(this, index);
|
|
|
875 |
TRACE_PHI(tty->print_cr("creating phi-function %c%d for local %d", existing_state->local_at(index)->type()->tchar(), existing_state->local_at(index)->id(), index));
|
|
|
876 |
}
|
|
|
877 |
}
|
|
|
878 |
}
|
|
|
879 |
|
|
|
880 |
assert(existing_state->caller_state() == new_state->caller_state(), "caller states must be equal");
|
|
|
881 |
|
|
|
882 |
} else {
|
|
|
883 |
assert(false, "stack or locks not matching (invalid bytecodes)");
|
|
|
884 |
return false;
|
|
|
885 |
}
|
|
|
886 |
|
|
|
887 |
TRACE_PHI(tty->print_cr("********** try_merge for block B%d successful", block_id()));
|
|
|
888 |
|
|
|
889 |
return true;
|
|
|
890 |
}
|
|
|
891 |
|
|
|
892 |
|
|
|
893 |
#ifndef PRODUCT
|
|
|
894 |
void BlockBegin::print_block() {
|
|
|
895 |
InstructionPrinter ip;
|
|
|
896 |
print_block(ip, false);
|
|
|
897 |
}
|
|
|
898 |
|
|
|
899 |
|
|
|
900 |
void BlockBegin::print_block(InstructionPrinter& ip, bool live_only) {
|
|
|
901 |
ip.print_instr(this); tty->cr();
|
|
|
902 |
ip.print_stack(this->state()); tty->cr();
|
|
|
903 |
ip.print_inline_level(this);
|
|
|
904 |
ip.print_head();
|
|
|
905 |
for (Instruction* n = next(); n != NULL; n = n->next()) {
|
|
|
906 |
if (!live_only || n->is_pinned() || n->use_count() > 0) {
|
|
|
907 |
ip.print_line(n);
|
|
|
908 |
}
|
|
|
909 |
}
|
|
|
910 |
tty->cr();
|
|
|
911 |
}
|
|
|
912 |
#endif // PRODUCT
|
|
|
913 |
|
|
|
914 |
|
|
|
915 |
// Implementation of BlockList
|
|
|
916 |
|
|
|
917 |
void BlockList::iterate_forward (BlockClosure* closure) {
|
|
|
918 |
const int l = length();
|
|
|
919 |
for (int i = 0; i < l; i++) closure->block_do(at(i));
|
|
|
920 |
}
|
|
|
921 |
|
|
|
922 |
|
|
|
923 |
void BlockList::iterate_backward(BlockClosure* closure) {
|
|
|
924 |
for (int i = length() - 1; i >= 0; i--) closure->block_do(at(i));
|
|
|
925 |
}
|
|
|
926 |
|
|
|
927 |
|
|
|
928 |
void BlockList::blocks_do(void f(BlockBegin*)) {
|
|
|
929 |
for (int i = length() - 1; i >= 0; i--) f(at(i));
|
|
|
930 |
}
|
|
|
931 |
|
|
|
932 |
|
|
|
933 |
void BlockList::values_do(void f(Value*)) {
|
|
|
934 |
for (int i = length() - 1; i >= 0; i--) at(i)->block_values_do(f);
|
|
|
935 |
}
|
|
|
936 |
|
|
|
937 |
|
|
|
938 |
#ifndef PRODUCT
|
|
|
939 |
void BlockList::print(bool cfg_only, bool live_only) {
|
|
|
940 |
InstructionPrinter ip;
|
|
|
941 |
for (int i = 0; i < length(); i++) {
|
|
|
942 |
BlockBegin* block = at(i);
|
|
|
943 |
if (cfg_only) {
|
|
|
944 |
ip.print_instr(block); tty->cr();
|
|
|
945 |
} else {
|
|
|
946 |
block->print_block(ip, live_only);
|
|
|
947 |
}
|
|
|
948 |
}
|
|
|
949 |
}
|
|
|
950 |
#endif // PRODUCT
|
|
|
951 |
|
|
|
952 |
|
|
|
953 |
// Implementation of BlockEnd
|
|
|
954 |
|
|
|
955 |
void BlockEnd::set_begin(BlockBegin* begin) {
|
|
|
956 |
BlockList* sux = NULL;
|
|
|
957 |
if (begin != NULL) {
|
|
|
958 |
sux = begin->successors();
|
|
|
959 |
} else if (_begin != NULL) {
|
|
|
960 |
// copy our sux list
|
|
|
961 |
BlockList* sux = new BlockList(_begin->number_of_sux());
|
|
|
962 |
for (int i = 0; i < _begin->number_of_sux(); i++) {
|
|
|
963 |
sux->append(_begin->sux_at(i));
|
|
|
964 |
}
|
|
|
965 |
}
|
|
|
966 |
_sux = sux;
|
|
|
967 |
_begin = begin;
|
|
|
968 |
}
|
|
|
969 |
|
|
|
970 |
|
|
|
971 |
void BlockEnd::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) {
|
|
|
972 |
substitute(*_sux, old_sux, new_sux);
|
|
|
973 |
}
|
|
|
974 |
|
|
|
975 |
|
|
|
976 |
void BlockEnd::other_values_do(void f(Value*)) {
|
|
|
977 |
if (state_before() != NULL) state_before()->values_do(f);
|
|
|
978 |
}
|
|
|
979 |
|
|
|
980 |
|
|
|
981 |
// Implementation of Phi
|
|
|
982 |
|
|
|
983 |
// Normal phi functions take their operands from the last instruction of the
|
|
|
984 |
// predecessor. Special handling is needed for xhanlder entries because there
|
|
|
985 |
// the state of arbitrary instructions are needed.
|
|
|
986 |
|
|
|
987 |
Value Phi::operand_at(int i) const {
|
|
|
988 |
ValueStack* state;
|
|
|
989 |
if (_block->is_set(BlockBegin::exception_entry_flag)) {
|
|
|
990 |
state = _block->exception_state_at(i);
|
|
|
991 |
} else {
|
|
|
992 |
state = _block->pred_at(i)->end()->state();
|
|
|
993 |
}
|
|
|
994 |
assert(state != NULL, "");
|
|
|
995 |
|
|
|
996 |
if (is_local()) {
|
|
|
997 |
return state->local_at(local_index());
|
|
|
998 |
} else {
|
|
|
999 |
return state->stack_at(stack_index());
|
|
|
1000 |
}
|
|
|
1001 |
}
|
|
|
1002 |
|
|
|
1003 |
|
|
|
1004 |
int Phi::operand_count() const {
|
|
|
1005 |
if (_block->is_set(BlockBegin::exception_entry_flag)) {
|
|
|
1006 |
return _block->number_of_exception_states();
|
|
|
1007 |
} else {
|
|
|
1008 |
return _block->number_of_preds();
|
|
|
1009 |
}
|
|
|
1010 |
}
|
|
|
1011 |
|
|
|
1012 |
|
|
|
1013 |
// Implementation of Throw
|
|
|
1014 |
|
|
|
1015 |
void Throw::state_values_do(void f(Value*)) {
|
|
|
1016 |
BlockEnd::state_values_do(f);
|
|
|
1017 |
}
|