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buildingvirtualmachineforeva's Introduction

BuildingVirtualMachineForEva

Building a Virtual Machine for Eva Programming Language

Control Flow and Variables

Control Flow | Branch Instruction

The if conditional statement

(if <test> 
    <consequent>
    <alternate>)

(if (>5 10) 1 2)

The construction of the If statement Machine code looks like this:

<test>
JMP_IF_FALSE
<alternate-begin-address>
<consequent>
JMP
<alternate-end-address>
<alternate>
...

For the example (if (> 5 10) 1 2), the machine code emitted would be: The byte address 00 would be patched later to the correct address.

<test>          CONST 0 (5)
<test>          CONST 1 (10)
<test>          COMPARE 1 (>)
                JMP_IF_FALSE
                00
                00
<consequent>    CONST 2 (1)
                JMP
                00
                00
<alternate>     CONST 3 (2)
                ...

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