1 /* 2 * Copyright (c) 2013, Red Hat Inc. 3 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. 4 * All rights reserved. 5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 6 * 7 * This code is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 only, as 9 * published by the Free Software Foundation. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 * 25 */ 26 27 #ifndef CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP 28 #define CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP 29 30 // Simulates the FPU stack and maintains mapping [fpu-register -> stack offset] 31 // FPU registers are described as numbers from 0..nof_fpu_regs-1 32 33 class Compilation; 34 35 class FpuStackSim VALUE_OBJ_CLASS_SPEC { 36 private: 37 Compilation* _compilation; 38 int _stack_size; 39 int _regs[FrameMap::nof_fpu_regs]; 40 41 int tos_index() const { return _stack_size - 1; } 42 43 int regs_at(int i) const; 44 void set_regs_at(int i, int val); 45 void dec_stack_size(); 46 void inc_stack_size(); 47 48 // unified bailout support 49 Compilation* compilation() const { return _compilation; } 50 void bailout(const char* msg) const { compilation()->bailout(msg); } 51 bool bailed_out() const { return compilation()->bailed_out(); } 52 53 public: 54 FpuStackSim(Compilation* compilation); 55 void pop (); 56 void pop (int rnr); // rnr must be on tos 57 void push(int rnr); 58 void swap(int offset); // exchange tos with tos + offset 59 int offset_from_tos(int rnr) const; // return the offset of the topmost instance of rnr from TOS 60 int get_slot(int tos_offset) const; // return the entry at the given offset from TOS 61 void set_slot(int tos_offset, int rnr); // set the entry at the given offset from TOS 62 void rename(int old_rnr, int new_rnr); // rename all instances of old_rnr to new_rnr 63 bool contains(int rnr); // debugging support only 64 bool is_empty(); 65 bool slot_is_empty(int tos_offset); 66 int stack_size() const { return _stack_size; } 67 void clear(); 68 intArray* write_state(); 69 void read_state(intArray* fpu_stack_state); 70 71 void print() PRODUCT_RETURN; 72 }; 73 74 #endif // CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP