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Lecture 13 Java Virtual Machine: Instruction Set

Lecture 13 Java Virtual Machine: Instruction Set. Instructors: Fu-Chiung Cheng ( 鄭福炯 ) Associate Professor Computer Science & Engineering Tatung Institute of Technology. 1. Java Program. class SumI { public static void main (String[] args) { int count=10; int sum =0;

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Lecture 13 Java Virtual Machine: Instruction Set

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  1. Lecture 13Java Virtual Machine: Instruction Set Instructors: Fu-Chiung Cheng (鄭福炯) Associate Professor Computer Science & Engineering Tatung Institute of Technology 1

  2. Java Program class SumI { public static void main (String[] args) { int count=10; int sum =0; for (int index=1;index<count;index++) sum=sum+index; } // method main } // class SumI 2

  3. Java ByteCode Method void main(java.lang.String[]) 0 bipush 10 // byte push 10 to stack (0x10) 2 istore_1 // load 10 (top of stack) to count 3 iconst_0 // push 0 to stack 4 istore_2 // load 0 (top of stack to sum 5 iconst_1 // push 1 to stack 6 istore_3 // load 1 (top of stack) to index 7 goto 17 // go to 17 3

  4. Java ByteCode 10 iload_2 // load sum to stack 11 iload_3 // load index to stack 12 iadd // add 13 istore_2 // store “top of stack” to sum 14 iinc 3 1 // index ++ 17 iload_3 // load index to stack 18 iload_1 // load count to stack 19 if_icmplt 10 // if index < count goto 10 22 return 3

  5. import java.io.*; class ReadFile { public static void main (String[] args) { try { FileInputStream in = new FileInputStream(args[0]); int c; while((c = in.read()) != -1) System.out.println(c); in.close(); } catch(Exception e) { e.printStackTrace(); } } // method main } // class ReadFile

  6. Reading 3:Chap 6: Java Virtual Machine Instruction set

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