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/*
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* Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2008, 2009 Red Hat, Inc.
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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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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class SharkState : public SharkTargetInvariants {
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public:
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SharkState(const SharkTargetInvariants* parent)
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: SharkTargetInvariants(parent),
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_method(NULL),
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_oop_tmp(NULL),
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_has_safepointed(false) { initialize(NULL); }
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SharkState(const SharkState* state)
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: SharkTargetInvariants(state),
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_method(state->_method),
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_oop_tmp(state->_oop_tmp),
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_has_safepointed(state->_has_safepointed) { initialize(state); }
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private:
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void initialize(const SharkState* state);
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private:
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llvm::Value* _method;
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SharkValue** _locals;
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SharkValue** _stack;
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SharkValue** _sp;
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int _num_monitors;
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llvm::Value* _oop_tmp;
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bool _has_safepointed;
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// Method
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public:
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llvm::Value** method_addr() {
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return &_method;
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}
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llvm::Value* method() const {
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return _method;
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}
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protected:
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void set_method(llvm::Value* method) {
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_method = method;
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}
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// Local variables
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public:
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SharkValue** local_addr(int index) const {
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assert(index >= 0 && index < max_locals(), "bad local variable index");
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return &_locals[index];
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}
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SharkValue* local(int index) const {
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return *local_addr(index);
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}
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void set_local(int index, SharkValue* value) {
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*local_addr(index) = value;
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}
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// Expression stack
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public:
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SharkValue** stack_addr(int slot) const {
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assert(slot >= 0 && slot < stack_depth(), "bad stack slot");
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return &_sp[-(slot + 1)];
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}
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SharkValue* stack(int slot) const {
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return *stack_addr(slot);
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}
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protected:
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void set_stack(int slot, SharkValue* value) {
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*stack_addr(slot) = value;
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}
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public:
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int stack_depth() const {
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return _sp - _stack;
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}
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void push(SharkValue* value) {
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assert(stack_depth() < max_stack(), "stack overrun");
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*(_sp++) = value;
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}
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SharkValue* pop() {
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assert(stack_depth() > 0, "stack underrun");
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return *(--_sp);
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}
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// Monitors
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public:
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int num_monitors() const {
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return _num_monitors;
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}
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void set_num_monitors(int num_monitors) {
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_num_monitors = num_monitors;
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}
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// Temporary oop slot
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public:
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llvm::Value** oop_tmp_addr() {
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return &_oop_tmp;
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}
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llvm::Value* oop_tmp() const {
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return _oop_tmp;
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}
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void set_oop_tmp(llvm::Value* oop_tmp) {
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_oop_tmp = oop_tmp;
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}
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// Safepointed status
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public:
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bool has_safepointed() const {
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return _has_safepointed;
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}
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void set_has_safepointed(bool has_safepointed) {
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_has_safepointed = has_safepointed;
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}
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// Comparison
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public:
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bool equal_to(SharkState* other);
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// Copy and merge
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public:
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SharkState* copy() const {
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return new SharkState(this);
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}
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void merge(SharkState* other,
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llvm::BasicBlock* other_block,
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llvm::BasicBlock* this_block);
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// Value replacement
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public:
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void replace_all(SharkValue* old_value, SharkValue* new_value);
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};
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class SharkTopLevelBlock;
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// SharkNormalEntryState objects are used to create the state
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// that the method will be entered with for a normal invocation.
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class SharkNormalEntryState : public SharkState {
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public:
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SharkNormalEntryState(SharkTopLevelBlock* block,
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llvm::Value* method);
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};
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// SharkOSREntryState objects are used to create the state
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// that the method will be entered with for an OSR invocation.
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class SharkOSREntryState : public SharkState {
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public:
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SharkOSREntryState(SharkTopLevelBlock* block,
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llvm::Value* method,
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llvm::Value* osr_buf);
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};
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// SharkPHIState objects are used to manage the entry state
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// for blocks with more than one entry path or for blocks
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// entered from blocks that will be compiled later.
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class SharkPHIState : public SharkState {
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public:
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SharkPHIState(SharkTopLevelBlock* block);
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private:
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SharkTopLevelBlock* _block;
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private:
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SharkTopLevelBlock* block() const {
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return _block;
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}
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public:
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void add_incoming(SharkState* incoming_state);
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};
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