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feat: 支持 long64 转 byte8、short16

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zhangxun 2025-06-28 21:04:23 +08:00
parent ec94191153
commit fe9a8e7505
2 changed files with 96 additions and 0 deletions
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48
src/main/java/org/jcnc/snow/vm/commands/type/conversion/L2BCommand.java Normal file
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package org.jcnc.snow.vm.commands.type.conversion;
import org.jcnc.snow.vm.interfaces.Command;
import org.jcnc.snow.vm.module.CallStack;
import org.jcnc.snow.vm.module.LocalVariableStore;
import org.jcnc.snow.vm.module.OperandStack;
/**
* L2BCommand Opcode: Represents the type conversion operation from long64 to byte8 in the virtual machine.
* <p>This opcode is implemented by the {@link L2BCommand} class, which defines its specific execution logic.</p>
*
* <p>Execution Steps:</p>
* <ol>
* <li>Pop the top long64 value from the operand stack.</li>
* <li>Convert the long64 value to a byte8 value.</li>
* <li>Push the converted byte8 value back onto the operand stack for subsequent operations.</li>
* </ol>
*
* <p>This opcode is used to widen a long64 value to a byte8 type for high-precision floating-point computations.</p>
*/
public class L2BCommand implements Command {
/**
* Default constructor for creating an instance of L2BCommand.
*/
public L2BCommand() {
// Empty constructor
}
/**
* Executes the long64 to byte8 conversion operation.
*
* @param parts The array of instruction parameters, which is not used in this operation.
* @param currentPC The current program counter, representing the instruction address.
* @param operandStack The operand stack of the virtual machine.
* @param localVariableStore The local variable store for managing method-local variables.
* @param callStack The call stack of the virtual machine.
* @return The updated program counter after execution.
*/
@Override
public int execute(String[] parts, int currentPC, OperandStack operandStack,
LocalVariableStore localVariableStore, CallStack callStack) {
long value = (long) operandStack.pop();
byte convertedValue = (byte) value;
operandStack.push(convertedValue);
return currentPC + 1;
}
}

48
src/main/java/org/jcnc/snow/vm/commands/type/conversion/L2SCommand.java Normal file
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package org.jcnc.snow.vm.commands.type.conversion;
import org.jcnc.snow.vm.interfaces.Command;
import org.jcnc.snow.vm.module.CallStack;
import org.jcnc.snow.vm.module.LocalVariableStore;
import org.jcnc.snow.vm.module.OperandStack;
/**
* L2SCommand Opcode: Represents the type conversion operation from long64 to short16 in the virtual machine.
* <p>This opcode is implemented by the {@link L2SCommand} class, which defines its specific execution logic.</p>
*
* <p>Execution Steps:</p>
* <ol>
* <li>Pop the top long64 value from the operand stack.</li>
* <li>Convert the long64 value to a short16 value.</li>
* <li>Push the converted short16 value back onto the operand stack for subsequent operations.</li>
* </ol>
*
* <p>This opcode is used to widen a long64 value to a short16 type for high-precision floating-point computations.</p>
*/
public class L2SCommand implements Command {
/**
* Default constructor for creating an instance of L2SCommand.
*/
public L2SCommand() {
// Empty constructor
}
/**
* Executes the long64 to short16 conversion operation.
*
* @param parts The array of instruction parameters, which is not used in this operation.
* @param currentPC The current program counter, representing the instruction address.
* @param operandStack The operand stack of the virtual machine.
* @param localVariableStore The local variable store for managing method-local variables.
* @param callStack The call stack of the virtual machine.
* @return The updated program counter after execution.
*/
@Override
public int execute(String[] parts, int currentPC, OperandStack operandStack,
LocalVariableStore localVariableStore, CallStack callStack) {
long value = (long) operandStack.pop();
short convertedValue = (short) value;
operandStack.push(convertedValue);
return currentPC + 1;
}
}