1 /* 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP 26 #define CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP 27 28 // Simulates the FPU stack and maintains mapping [fpu-register -> stack offset] 29 // FPU registers are described as numbers from 0..nof_fpu_regs-1 30 31 class Compilation; 32 33 class FpuStackSim VALUE_OBJ_CLASS_SPEC { 34 private: 35 Compilation* _compilation; 36 int _stack_size; 37 int _regs[FrameMap::nof_fpu_regs]; 38 39 int tos_index() const { return _stack_size - 1; } 40 41 int regs_at(int i) const; 42 void set_regs_at(int i, int val); 43 void dec_stack_size(); 44 void inc_stack_size(); 45 46 // unified bailout support 47 Compilation* compilation() const { return _compilation; } 48 void bailout(const char* msg) const { compilation()->bailout(msg); } 49 bool bailed_out() const { return compilation()->bailed_out(); } 50 51 public: 52 FpuStackSim(Compilation* compilation); 53 void pop (); 54 void pop (int rnr); // rnr must be on tos 55 void push(int rnr); 56 void swap(int offset); // exchange tos with tos + offset 57 int offset_from_tos(int rnr) const; // return the offset of the topmost instance of rnr from TOS 58 int get_slot(int tos_offset) const; // return the entry at the given offset from TOS 59 void set_slot(int tos_offset, int rnr); // set the entry at the given offset from TOS 60 void rename(int old_rnr, int new_rnr); // rename all instances of old_rnr to new_rnr 61 bool contains(int rnr); // debugging support only 62 bool is_empty(); 63 bool slot_is_empty(int tos_offset); 64 int stack_size() const { return _stack_size; } 65 void clear(); 66 intArray* write_state(); 67 void read_state(intArray* fpu_stack_state); 68 69 void print() PRODUCT_RETURN; 70 }; 71 72 #endif // CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP