[PDF] [PDF] Python (v3) Stack Frame Examples

[PDF] Python (v3) Stack Frame Examples

Python (v3) Stack Frame Examples CS21 at stack frame and creating an object on the heap for the value We draw an variables for them in the stack frame

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Python (v3) Stack Frame Examples

CS21 at Swarthmore College

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:2

x y main: At the beginning of the program,mainis called. We create a new stack frame. Sincemainhas no parameters, the stack frame is empty. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n= 4

8out = f(n,2)

9print(out)

10

11main()f:2

x y main:7 At the beginning of the program,mainis called. We create a new stack frame. Sincemainhas no parameters, the stack frame is empty. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n= 4

8out = f(n,2)

9print(out)

10

11main()f:2

x y main:7 When line 7 ofmainis executed, the variablenis set to the value4. We symbolize this by writing the variable name in the stack frame and creating an object on the heap for the value.

We draw an arrow from the variable to its value.

2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out= f (n,2)

9print(out)

10

11main()f:2

x y main:8 n4 When line 7 ofmainis executed, the variablenis set to the value4. We symbolize this by writing the variable name in the stack frame and creating an object on the heap for the value.

We draw an arrow from the variable to its value.

2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:2

x y main:8 n4 When line 8 is executed, we will callf. To do so, we must rst determine the value of each of its arguments. In this case, the rst parameter isn, whose value is currently4. The second parameter is just2. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out= f (n,2)

9print(out)

10

11main()f:2

x y main:8 n4 Once we've established the value of the arguments on line 8 (4and2, respectively), theffunction is called. We create a new stack frame. Sincefhas two parameters, we create variables for them in the stack frame. They point to their corresponding values on the heap. 2/3

Basic Example

1deff(x,y):

2x= x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:2

x y2 main:8 n4 Once we've established the value of the arguments on line 8 (4and2, respectively), theffunction is called. We create a new stack frame. Sincefhas two parameters, we create variables for them in the stack frame. They point to their corresponding values on the heap. 2/3

Basic Example

1deff(x,y):

2x= x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:2

x y2 main:8 n4 Note that the stack frame for main is keeping track of where we were in that function. When we are done withf, we will return to that line. 2/3

Basic Example

1deff(x,y):

2x= x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:2

x y2 main:8 n4 When we run line 2 inf, we will update the variablexby adding the contents of the variableyto it. Sinceints are immutable, we will create anewobject on the heap and make xpoint to it. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:3

x y26 main:8 n4 When we run line 2 inf, we will update the variablexby adding the contents of the variableyto it. Sinceints are immutable, we will create anewobject on the heap and make xpoint to it. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:3

x y26 main:8 n4 Line 3 will print the contents of thexvariable: in this case, 6. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4returnx

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:4

x y26 main:8 n4 Line 3 will print the contents of thexvariable: in this case, 6. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4returnx

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:4

x y26 main:8 n4 Line 4 will return the value ofxto the place wherefwas called. As a result, the variableoutinmainis given the value

6, and the frame forfwill be removed from the stack.

2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out= f (n,2)

9print(out)

10

11main()f:4

x y26 main:8 n4 Line 4 will return the value ofxto the place wherefwas called. As a result, the variableoutinmainis given the value

6, and the frame forfwill be removed from the stack.

2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:4

x y26 main:9 n out4 Line 4 will return the value ofxto the place wherefwas called. As a result, the variableoutinmainis given the value

6, and the frame forfwill be removed from the stack.

2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:4

x y26 main:9 n out4 Line 9 prints the contents of theoutvariable (here,6). After it runs, themainfunction is complete and the program is nished. 2/3

Basic Example

1deff(x,y):

2x = x + y

3print(x)

4return x

5

6defmain():

7n = 4

8out = f(n,2)

9print(out)

10

11main()f:4

x y26 main: n out4 Line 9 prints the contents of theoutvariable (here,6). After it runs, themainfunction is complete and the program is nished. 2/3quotesdbs_dbs17.pdfusesText_23