Abstract

The E(mbedded ) Machine, is a virtual machine that interprets the E code. Initialy the E Code consisted of 6 instructions:

• call – executes a driver, a driver is a piece of code written in a conventional language (in this case C);
• release – releases a task, the task function is also written in a conventional language ( C );
• future – mark a piece of E code to be executed at some future time;
• jump – unconditioned jump to a specified address;
• if – conditioned jump to a specified address;
• return – stops the E Machine from executing E code until an event occuers;

• call – executes a driver, a driver is a piece of code written in a conventional language (in this case C);
• release – releases a task, the task function is also written in a conventional language ( C );
• wfuture – mark a piece of E code to be executed at some future time, the WriteQueue is used to store the trigger;
• sfuture – mark a piece of E code to be executed at some future time, the SwitchQueue is used to store the trigger;
• rfuture – mark a piece of E code to be executed at some future time, the ReadQueue is used to store the trigger;
• jumpConditional – conditioned jump to a specified address;
• jumpAbsolute – absolute jump to a specified address;
• jumpSubroutine – subroutine jump to a specified address;
• copyRegister – copy the contents of a register Rx into another register Ry;
• pushRegister – push the contents of a register Rx onto a stack;
• popRegister – pop content from a stack to a register Rx;
• getParent – get the parent trigger of the trigger stored in a register Rx and store it into another register Ry;
• setParent – set the parent trigger of the trigger stored in a register Rx to the trigger stored in register Ry;
• copyChildren – copy the children list of the trigger in a register Rx into the children list of the trigger in register Ry;
• setParentOfChildren – set the parent of all the children of the trigger in a register Rx to the trigger stored in a register Ry;
• deleteChildren – remove all child triggers of the trigger in Rx recursively;
• replaceChild – in the children list of the trigger stored in register Rx, replace trigger stored in Ry with trigger stored in Rz;
• cleanChildrenList – empty the children list of trigger stored in a register Rx;
• return – returns from subroutine or stops the E Machine from executing E code until an event occuers;

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How To Run It?

• edit the “makefile” to change the “EXAMPLE” definition to point to the file you want to compile;
• type “make all” to compile the htl example program and build the E Machine;
• type “make all host=[host_name]” to build the E Machine for specified host.

• type “./e-machine” to run the E Machine for non-distributed programs;
• type “./e-machine [ID]” to run the E Machine for the host with the specified ID, the ID corresponds to the order in which the hosts appear in the HTL file, starting from 0.