project08 template files

08/FunctionCalls/FibonacciElement/FibonacciElement.tst

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/8/FunctionCalls/FibonacciElement/FibonacciElement.tst
+
+// Tests FibonacciElement.asm on the CPU emulator. 
+// FibonacciElement.asm results from translating Main.vm and Sys.vm into
+// a single assembly program, stored in the file FibonacciElement.asm.
+
+load FibonacciElement.asm,
+output-file FibonacciElement.out,
+compare-to FibonacciElement.cmp,
+
+repeat 6000 {
+	ticktock;
+}
+
+// Outputs the stack pointer and the value at the stack's base.
+// That's where the implementation should put the return value.
+output-list RAM[0]%D1.6.1 RAM[261]%D1.6.1;
+output;

08/FunctionCalls/FibonacciElement/FibonacciElementVME.tst

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/8/FunctionCalls/FibonacciElement/FibonacciElementVME.tst
+
+// Tests and illustrates the given Fibonacci element program on the VM emulator.
+
+load,  // loads all the VM files from the current folder
+output-file FibonacciElement.out,
+compare-to FibonacciElement.cmp,
+
+set sp 261,
+
+repeat 110 {
+  vmstep;
+}
+
+// Outputs the stack pointer and the value at the stack's base.
+// That's where the implementation should put the return value.  
+output-list RAM[0]%D1.6.1 RAM[261]%D1.6.1;
+output;

08/FunctionCalls/FibonacciElement/Main.vm

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/8/FunctionCalls/FibonacciElement/Main.vm
+
+// Contains one function: Main.fibonacci.
+
+// Computes the n'th element of the Fibonacci series, recursively.
+// n is given in argument[0]. Called by the Sys.init function 
+// (part of the Sys.vm file), which sets argument[0] to an input
+// value and then calls Main.fibonacci.
+function Main.fibonacci 0
+	push argument 0
+	push constant 2
+	lt                     
+	if-goto N_LT_2        
+	goto N_GE_2
+label N_LT_2               // if n < 2 returns n
+	push argument 0        
+	return
+label N_GE_2               // if n >= 2 returns fib(n - 2) + fib(n - 1)
+	push argument 0
+	push constant 2
+	sub
+	call Main.fibonacci 1  // computes fib(n - 2)
+	push argument 0
+	push constant 1
+	sub
+	call Main.fibonacci 1  // computes fib(n - 1)
+	add                    // returns fib(n - 1) + fib(n - 2)
+	return

08/FunctionCalls/FibonacciElement/Sys.vm

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/8/FunctionCalls/FibonacciElement/Sys.vm
+
+// Containts one function: Sys.init.
+
+// Pushes a constant n onto the stack, and calls the Main.fibonacii
+// function, which computes the n'th element of the Fibonacci series.
+// Note that by convention, the Sys.init function is called "automatically" 
+// by the bootstrap code generated by the VM translator.
+function Sys.init 0
+    // Computes fibonacci(4)
+	push constant 4
+	// Calls the function, informing that one argument was pushed onto the stack
+	call Main.fibonacci 1
+label END  
+	goto END  // loops infinitely