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// This file is part of uVM.
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//
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// uVM is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// uVM is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with uVM. If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include <vector>
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#include "../include/cpu.h"
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int main(int argc, char* argv[]) {
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// Allocate an 800 word stack size to the CPU on initialization
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CPU c(800);
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// XXX:
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// Until I find a unit testing framework these vectors of bytecode will
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// serve as (terrible) tests.
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// Answer: 3
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std::vector<int> code_iadd {
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CPU::opcode::IPUSH, 0x1,
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CPU::opcode::IPUSH, 0x2,
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CPU::opcode::IADD,
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CPU::opcode::PRINT,
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CPU::opcode::HALT
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};
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// Answer: 1
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std::vector<int> code_isub {
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CPU::opcode::IPUSH, 0x1,
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CPU::opcode::IPUSH, 0x2,
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CPU::opcode::ISUB,
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CPU::opcode::PRINT,
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CPU::opcode::HALT
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};
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// Answer: 16
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std::vector<int> code_imul {
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CPU::opcode::IPUSH, 0x4,
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CPU::opcode::IPUSH, 0x4,
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CPU::opcode::IMUL,
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CPU::opcode::PRINT,
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CPU::opcode::HALT,
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};
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// Answer: 1
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std::vector<int> code_idiv {
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CPU::opcode::IPUSH, 0x4,
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CPU::opcode::IPUSH, 0x4,
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CPU::opcode::IDIV,
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CPU::opcode::PRINT,
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CPU::opcode::HALT,
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};
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// Answer: 3 % 4 = 3 (0 remainder 3)
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std::vector<int> code_irem {
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CPU::opcode::IPUSH, 0x4,
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CPU::opcode::IPUSH, 0x3,
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CPU::opcode::IREM,
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CPU::opcode::PRINT,
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CPU::opcode::HALT,
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};
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// Answer: 8
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// This tests unconditional jumping. If the JMP instruction fails the code will fail to
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// answer correctly.
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std::vector<int> code_jmp {
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CPU::opcode::IPUSH, 0x4,
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CPU::opcode::IPUSH, 0x4,
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CPU::opcode::JMP, 0x7, // JMP to 0x7 - the 8th line of code in memory
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CPU::opcode::ISUB,
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CPU::opcode::IADD,
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CPU::opcode::PRINT,
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CPU::opcode::HALT,
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};
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// Answer: 10
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// This tests the use of conditional jumps to implement a simple while loop.
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std::vector<int> code_jc {
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CPU::opcode::IPUSH, 0xA, // Limit
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CPU::opcode::ISAVE1, // Store the limit
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CPU::opcode::IPUSH, 0x0, // Counter
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CPU::opcode::ISAVE2, // Store the counter
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CPU::opcode::IPUSH, 0x0, // Accumulator (for our print)
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CPU::opcode::ISAVE0, // Store the accumulator
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CPU::opcode::ILOAD1, // Load the limit
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CPU::opcode::ILOAD2, // Load the counter
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CPU::opcode::CMP, // Compare limit to counter
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CPU::opcode::JC, 0x1A, // Jump to PRINT if true
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CPU::opcode::ILOAD0, // Load the accumulator
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CPU::opcode::IPUSH, 0x1, // Push 1 onto the stack to be added to the accumulator
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CPU::opcode::IADD, // Add 1 to the accumulator
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CPU::opcode::ISAVE0, // Take the top of the stack, store it in t0 and pop it off
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CPU::opcode::ILOAD2, // Reload the counter
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CPU::opcode::IPUSH, 0x1, // Push 1 onto the stack to be added to the counter
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CPU::opcode::IADD, // Add one to the accumulator
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CPU::opcode::ISAVE2, // Store the counter
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CPU::opcode::JMP, 0x9, // Jump to the CMP statement
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CPU::opcode::ILOAD0, // Load the accumulator for PRINT
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CPU::opcode::PRINT,
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CPU::opcode::HALT,
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};
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c.load(code_jc);
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c.run();
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return 0;
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}
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