fix spelling
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@ -54,12 +54,12 @@ The objects the machine works on are:
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and working on means, these are the only objects which the machine accesses. Ie all others would have to be moved first.
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When a Method needs to make a call, or send a message, it creates a new Message object.
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Messages contain return addresses and arguemnts.
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When a Method needs to make a call, or send a Message, it creates a NewMessage object.
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Messages contain return addresses and arguments.
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Then the machine must find the method to call. This is a function of the virtual machine an is implemented in ruby.
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Then the machine must find the method to call. This is a function of the virtual machine and is implemented in ruby.
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Then a new Method receives the message, creates a Frame for local and temporary variables and continues execution.
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Then a new Method receives the Message, creates a Frame for local and temporary variables and continues execution.
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The important thing here is that Messages and Frames are normal objects.
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@ -67,8 +67,9 @@ And interestingly we can partly use ruby to find the method, so in a way it is n
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Instead the sending goes back up and then down again.
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The Message object is the second parameter to the compile method, the run-time part as it were. Why? Since it only
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exists at runtime: to make compile time analysis possible. Especially for those times when we can resolve the method
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at compile time. (Which is for all vm code)
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exists at runtime: to make compile time analysis possible (it is after all the Virtual version, not Parfait. ie
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compile-time, not run-time). Especially for those times when we can resolve the method
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at compile time.
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*
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@ -9,7 +9,7 @@ These functions return their code, ie a Virtual::CompiledMethod object, which ca
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as if it were a "normal" function.
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A normal ruby function is one that is parsed and transformed to code. But not all functionality can be written in ruby,
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one of those chicken and egg things. C uses Assembler in this situation, we use Kernel function.
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one of those chicken and egg things. C uses Assembler in this situation, we use Builtin functions.
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Slightly more here : http://salama.github.io/2014/06/10/more-clarity.html (then still called Kernel)
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@ -1,7 +1,8 @@
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Minimal elf support
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===================
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This is really minnimal and works only for our current use case
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This is really minimal and works only for our current use case
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- no external functions (all syscalls)
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- only position independant code (no relocation)
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- embedded data (into text), no data section
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@ -1,4 +1,6 @@
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### A thin layer
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### Parfait: a thin layer
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(not everbody likes onion)
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Here we have a placeholder for things i am currently developing.
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@ -15,7 +17,8 @@ not
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compile - time
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always mixing those up: As such it is not loaded at compile time.
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always mixing those up: As such it is not loaded at compile time. On the other hand, we need to create data
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at compile time that matches the expectation of the code we create..
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A step back: the code (program) we compile runs at run - time.
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And so does parfait. So all we have to do is compile it with the program.
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@ -3,7 +3,7 @@ Register Machine
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This is the logic that uses the compiled virtual object space to produce code and an executable binary.
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There is a mechanism for an actual machine (derived class) to generate machine specific instructions (as the
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There is a mechanism for an actual machine (derived class) to generate harware specific instructions (as the
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plain ones in this directory don't assemble to binary). Currently there is only the Arm module to actually do
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that.
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@ -23,7 +23,7 @@ There are four virtual objects that are accessible (we can access their variable
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- Frame (local and tmp variables)
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- NewMessage ( to build the next message sent)
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These are pretty much the first four registers. When the code goes from virtual to register, we use register instrucitons
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These are pretty much the first four registers. When the code goes from virtual to register, we use register instructions
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to replace virtual ones.
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Eg: A Virtual::Set can move data around inside those objects. And since in Arm this can not be done in one instruciton,
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@ -31,7 +31,7 @@ we use two, one to move to an unused register and then into the destination. And
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to shift the type info.
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Another simple example is a Call. A simple case of a Class function call resolves the class object, and with the
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method name the function to be called at compile-time. And so this results in a Register::Call, which is an Arm
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method name the function to be found at compile-time. And so this results in a Register::Call, which is an Arm
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instruction.
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A C call
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@ -5,13 +5,14 @@ This is really an OV (object value) not object oriented machine.
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Integers and References are Values. We make them look like objects, sure, but they are not.
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Symbols have similar properties and those are:
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- eqality means identity
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- no chhange over lifetime
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- equality means identity
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- no change over lifetime
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It's like with Atoms: they used to be the smallest possible physical unit. Now we have electrons, proton and neutrons.
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And so objects are made up of Values (not objects), integers, floats , references and possibly more.
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Values have type in the same way objects have a class. We keep track of the type at runtime.
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Values have type in the same way objects have a class. We keep track of the type of a value at runtime, also in an
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similar way that objects have their classes at runtime.
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### Layers
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@ -21,12 +22,15 @@ comile the ast layer into Virtual:: objects
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The main objects are BootSpace (lots of objects), BootClass (represents a class),
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CompiledMethod (with Blocks and Instruction).
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*Virtual* Instructions get further transformed into *register* instructions. This is done by an abstractly defined
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**Virtual** Instructions get further transformed into **register** instructions. This is done by an abstractly defined
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Register Machine with basic Intructions. A concrete implementation (like Arm) derives and creates derived
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Instructions.
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The transformation is implemented as **passes** to make it easier to understand what is going on. Also this makes it
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easier to add functionality and optimisations from external (to the gem) sources.
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The final transformation assigns Positions to all boot objects (Linker) and assembles them into a binary representation.
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The data- part is then a representation of classes in the *parfait* runtime. And the instrucions make up the
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The data- part is then a representation of classes in the **parfait** runtime. And the instrucions make up the
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funtions.
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### Accessible Objects
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@ -46,9 +50,10 @@ The micro-kernel idea is well stated by: If you can leave it out, do.
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As such we are aiming for integer and reference (type) support, and a minimal class system
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(object/class/aray/hash/string).
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(object/class/aray/hash/string). It is possible to add types to the system in a similar way as we add classes,
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and also implement very machine dependent functionality which nevertheless is fully wrapped as OO.
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*Parfait* is that part of the runtime that can be coded in ruby. It is parsed, like any other code and always included
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in the resulting binary. Builtin is the part of the runtime that can not be coded in ruby (but is still needed). This
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is coded y construction CompiledMethods in code and neccesarily machine dependant.
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**Parfait** is that part of the runtime that can be coded in ruby. It is parsed, like any other code and always included
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in the resulting binary. **Builtin** is the part of the runtime that can not be coded in ruby (but is still needed). This
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is coded by construction CompiledMethods in code and neccesarily machine dependant.
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