Реферат Асемблер для платформи Java

maxstack 5;

maxlocals 3;

aload_0;

dload_1;

dload_1;

invokespecial Rectangle :: (double, double): void;

return;

end;

% ---------------------------------------------- ---------------%

% ---------------------------------------------- ---------------%

% файл MainClass.jsm

public class MainClass;

methods;

public (): void;

maxstack 1;

maxlocals 1;

aload_0;

invokespecial java.lang.Object :: (): void;

return;

end;

public static main (java.lang.String []): void;

maxstack 8;

maxlocals 7;

iconst_3;

anewarray Figure;

astore_1;

aload_1;

iconst_0;

new Circle;

dup;

ldc2_w double 10;

invokespecial Circle :: (double): void;

aastore;

aload_1;

iconst_1;

new Rectangle;

dup;

dconst_1;

ldc2_w double 2;

invokespecial Rectangle :: (double, double): void;

aastore;

aload_1;

iconst_2;

new Square;

dup;

ldc2_w double 3;

invokespecial Square :: (double): void;

aastore;

dconst_0;

dstore_2;

iconst_0;

istore 4;

l_50:

iload 4;

aload_1;

arraylength;

if_icmpge l_75;

dload_2;

aload_1;

iload 4;

aaload;

invokeinterface Figure :: getArea (): double, 1;

dadd;

dstore_2;

iinc 4, 1;

goto l_50;

l_75:

new java.io.BufferedReader;

dup;

new java.io.InputStreamReader;

dup;

getstatic java.lang.System :: in: java.io.InputStream;

invokespecial java.io.InputStreamReader :: (java.io.InputStream): void;

invokespecial java.io.BufferedReader :: (java.io.Reader): void;

astore 4;

l_50:

aload 4;

invokevirtual java.io.BufferedReader :: readLine (): java.lang.String;

invokestatic java.lang.Double :: parseDouble (java.lang.String): double;

dstore 5;

getstatic java.lang.System :: out: java.io.PrintStream;

dload 5;

dload_2;

dadd;

invokevirtual java.io.PrintStream :: println (double): void;

l_114:

goto l_127;

l_117:

astore 4;

getstatic java.lang.System :: out: java.io.PrintStream;

ldc string "Error";

invokevirtual java.io.PrintStream :: println (java.lang.String): void;

l_127:

return;

protected_blocks;

java.io.IOException l_75: l_114> l_117;

end;

% ---------------------------------------------- ---------------%

Дана програма функціонально еквівалентна наступному коду на Java (асемблерний варіант створений на основі дизасемблювати з допомогою утиліти javap Java-програми):

// --------------------------------------------- --------------//

public interface Figure {

double getArea ();

}

// --------------------------------------------- --------------//

// --------------------------------------------- --------------//

public class Circle implements Figure {

private double m_radius;

public Circle (double radius) {

if (radius <0)

throw new IllegalArgumentException ();

m_radius = radius;

}

public double getArea () {

return m_radius * m_radius * Math.PI;

}

}

// --------------------------------------------- --------------//

// --------------------------------------------- --------------//

public class Rectangle implements Figure {

private double m_a;

private double m_b;

public Rectangle (double a, double b) {

if (! ((a> = 0) && (b> = 0)))

throw new IllegalArgumentException ();

m_a = a;

m_b = b;

}

public double getArea () {

return m_a * m_b;

}

}

// --------------------------------------------- --------------//

// --------------------------------------------- --------------//

public class Square extends Rectangle {

public Square (double a) {

super (a, a);

}

}

// --------------------------------------------- --------------//

// --------------------------------------------- --------------//

import java.io. *;

public class MainClass {

public static void main (String [] args) {

Figure [] figures = new Figure [3];

figures [0] = new Circle (10);

figures [1] = new Rectangle (1, 2); ...