| /* |
| * Copyright (c) 2012, 2018, 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. |
| */ |
| package vm.compiler.coverage.parentheses.share; |
| |
| import java.util.List; |
| |
| /** |
| * Tiny stack InstructionsExecutor. This executor verifies HotspotInstructionsExecutor |
| */ |
| public class TinyInstructionsExecutor implements InstructionsExecutor { |
| |
| private int[] stack; |
| private int stackHead = -1; |
| |
| public TinyInstructionsExecutor(int stackSize) { |
| stack = new int[stackSize]; |
| } |
| |
| private void putOnStack(int v) { |
| stack[++stackHead] = v; |
| } |
| |
| private void exec(Instruction instruction) { |
| switch (instruction) { |
| case ICONST_M1: |
| putOnStack(-1); |
| break; |
| case ICONST_0: |
| putOnStack(0); |
| break; |
| case ICONST_1: |
| putOnStack(1); |
| break; |
| case ICONST_2: |
| putOnStack(2); |
| break; |
| case ICONST_3: |
| putOnStack(3); |
| break; |
| case ICONST_4: |
| putOnStack(4); |
| break; |
| case ICONST_5: |
| putOnStack(5); |
| break; |
| case DUP: |
| stack[stackHead + 1] = stack[stackHead]; |
| stackHead++; |
| break; |
| |
| case IADD: |
| stack[stackHead - 1] += stack[stackHead]; |
| stackHead--; |
| break; |
| case ISUB: |
| stack[stackHead - 1] -= stack[stackHead]; |
| stackHead--; |
| break; |
| case IMUL: |
| stack[stackHead - 1] *= stack[stackHead]; |
| stackHead--; |
| break; |
| case IOR: |
| stack[stackHead - 1] |= stack[stackHead]; |
| stackHead--; |
| break; |
| case IAND: |
| stack[stackHead - 1] &= stack[stackHead]; |
| stackHead--; |
| break; |
| case IXOR: |
| stack[stackHead - 1] ^= stack[stackHead]; |
| stackHead--; |
| break; |
| case ISHL: |
| stack[stackHead - 1] <<= stack[stackHead]; |
| stackHead--; |
| break; |
| case ISHR: |
| stack[stackHead - 1] >>= stack[stackHead]; |
| stackHead--; |
| break; |
| |
| case SWAP: { |
| int t = stack[stackHead]; |
| stack[stackHead] = stack[stackHead - 1]; |
| stack[stackHead - 1] = t; |
| break; |
| } |
| case NOP: |
| break; |
| case INEG: |
| stack[stackHead] = -stack[stackHead]; |
| break; |
| } |
| } |
| |
| private int top() { |
| return stack[stackHead]; |
| } |
| |
| @Override |
| public int execute(List<Instruction> instructions) { |
| for (Instruction instruction : instructions) { |
| exec(instruction); |
| } |
| return top(); |
| } |
| } |