323 lines
13 KiB
Common Lisp
323 lines
13 KiB
Common Lisp
(in-package #:user-side-compiler)
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(defclass asm-object ()
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((%source :accessor source :initarg :source :initform nil)
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(%next :accessor next :initform nil)
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(%address :accessor address :initform nil)))
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(defclass asm-label (asm-object)
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((%name :accessor name :initarg :name)))
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(defclass asm-instruction (asm-object)
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((%opcode :accessor opcode :initarg :opcode)
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(%operand :accessor operand :initarg :operand :initform nil)
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(%byte-length :accessor byte-length :initarg :byte-length)))
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(defvar *asm-labels* (make-hash-table :test #'equal)
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"A hash table connecting identities (names) to ASM-LABEL objects.")
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(defvar *asm-head* nil
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"The first assembly object, used for traversal.")
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(defvar *asm-foot* nil
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"The (so far) last assembly object, used for construction.")
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(defun emit-asm-object (obj)
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(if (null *asm-foot*)
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(setf *asm-head* obj)
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(setf (next *asm-foot*) obj))
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(setf *asm-foot* obj))
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(defun emit-asm-instruction (&rest initargs)
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(let ((new-instruction (apply #'make-instance
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'asm-instruction
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initargs)))
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(emit-asm-object new-instruction)))
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(defun emit-asm-label (identity)
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(let ((label (make-instance 'asm-label :name identity)))
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(setf (gethash identity *asm-labels*)
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label)
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(emit-asm-object label)))
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(defvar *variable-allocations* (make-hash-table))
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(defvar *last-instruction* '(:nop))
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(defun varvec-index-in-zeropage-p (index)
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;; TODO: Handle case of too many variables
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t)
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(defun argvec-index-in-zeropage-p (index)
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;; TODO: Handle case of too many arguments (? not realistically needed)
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t)
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(defparameter +argvec-offset+ #x00)
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(defparameter +varvec-offset+ #x08)
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(defmacro with-variable-allocations (allocations &body body)
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`(let ((*variable-allocations* (make-hash-table)))
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(loop :for alloc :in ,allocations
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:do (setf (gethash (data alloc) *variable-allocations*) alloc))
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,@body))
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(defun allocation-details (data)
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(gethash data *variable-allocations*))
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(defun data-reference (data)
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(ecase (strategy (allocation-details data))
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((:named-variable :temporary-variable)
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(+ (varvec-index (allocation-details data))
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+varvec-offset+))
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(:direct-to-argvec
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(+ (position data (inputs (user data)))
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+argvec-offset+))))
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(defmacro define-normal-emitter (name immediate-opcode zeropage-opcode absolute-opcode)
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`(defun ,name (mode value)
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(cond ((eql mode :immediate)
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(emit-asm-instruction :opcode ,immediate-opcode
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:operand (the (unsigned-byte 8) value)
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:byte-length 2))
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((and (eql mode :address)
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(< value #x100))
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(emit-asm-instruction :opcode ,zeropage-opcode
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:operand (the (unsigned-byte 8) value)
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:byte-length 2))
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((eql mode :address)
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(emit-asm-instruction :opcode ,absolute-opcode
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:operand (the (unsigned-byte 16) value)
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:byte-length 3))
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(t
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(error "Invalid usage of ~A with arguments (~A ~A)" ',name mode value)))))
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(define-normal-emitter emit-lda #xa9 #xa5 #xad)
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(define-normal-emitter emit-sta (error "STA has no immediate mode.") #x85 #x8d)
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(define-normal-emitter emit-adc #x69 #x65 #x6d)
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(define-normal-emitter emit-cmp #xc9 #xc5 #xcd)
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(defun emit-store-data (data)
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(if (or (null (allocation-details data))
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(member (strategy (allocation-details data))
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'(:constant :accumulator)))
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(setf *last-instruction* '(:useless))
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(progn
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(emit-sta :address (data-reference data))
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(setf *last-instruction* (list :store data)))))
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(defun emit-store-bool (data)
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"Stores the inverse of the zeroflag to DATA. Inverse so that non-0 is TRUE."
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;; The "DATA is stored"-case
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(if (or (null (allocation-details data))
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(member (strategy (allocation-details data))
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'(:constant :accumulator)))
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(setf *last-instruction* '(:useless))
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(progn
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(emit-asm-instruction :opcode :php :byte-length 1)
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(emit-asm-instruction :opcode :pla :byte-length 1)
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(emit-asm-instruction :opcode :and :operand #b00000010 :byte-length 2)
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(emit-asm-instruction :opcode :lsr-a :byte-length 1)
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(emit-asm-instruction :opcode :not :operand #b00000001 :byte-length 2)
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(emit-sta :address (data-reference data))
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(setf *last-instruction* '(:store-zero-flag data)))))
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(defun emit-load-data (data)
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(if (or (member (strategy (allocation-details data))
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'(:accumulator :direct-to-argvec))
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(equal *last-instruction* (list :store data))
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(equal *last-instruction* (list :load data)))
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(setf *last-instruction* '(:useless))
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(progn
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(if (eql (strategy (allocation-details data)) :constant)
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(emit-lda :immediate (ir-constant-value data))
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(emit-lda :address (data-reference data)))
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(setf *last-instruction* (list :load data)))))
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(defun emit-load-bool (data)
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(if (or (member (strategy (allocation-details data))
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'(:accumulator))
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(equal *last-instruction* (list :store-zero-flag data))
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(equal *last-instruction* (list :load-zero-flag data)))
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(setf *last-instruction* '(:useless))
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(progn
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(if (eql (strategy (allocation-details data)) :constant)
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(progn
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(emit-lda :immediate (ir-constant-value data))
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(emit-asm-instruction :opcode :and :operand 1 :byte-length 1)
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(emit-cmp :immediate 1))
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(progn
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(emit-lda :address (data-reference data))
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(emit-asm-instruction :opcode :and :operand 1 :byte-length 1)
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(emit-cmp :immediate 1)))
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(setf *last-instruction* (list :load-zero-flag data)))))
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(defmethod compile-ir ((inst ir-inst))
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(warn "Skipped compiling ~A; no COMPILE-IR method" inst))
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(defmethod compile-ir ((inst ir-return))
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(emit-asm-instruction :opcode #x60 :byte-length 1))
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(defmethod compile-ir ((inst ir-plus))
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(unless (= (length (inputs inst)) 2)
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(error "During the final code generation step, IR-PLUS must have exactly 2 operands."))
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(emit-load-data (first (inputs inst)))
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(emit-asm-instruction :opcode #x18 :byte-length 1) ; Clear Carry
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(if (eql (strategy (allocation-details (second (inputs inst))))
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:constant)
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(emit-adc :immediate (ir-constant-value (second (inputs inst))))
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(emit-adc :address (data-reference (second (inputs inst)))))
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(emit-store-result (output inst)))
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(defmethod compile-ir ((inst ir-assign))
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(emit-load-data (input inst))
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(emit-store-result (output inst)))
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(defmethod compile-ir ((inst ir-fetchvar))
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(emit-load-data (input inst))
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(emit-store-result (output inst)))
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(defmethod compile-ir ((inst ir-call))
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(loop :for arg :in (inputs inst)
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:for arg-index :from 0
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:do (emit-load-data arg)
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:unless (eql (strategy (allocation-details arg)) :direct-to-argvec)
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:do (emit-sta :address (+ arg-index +argvec-offset+)))
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(emit-asm-instruction :opcode #x20 :operand (callee inst) :byte-length 3)
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(emit-store-result (output inst)))
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(defmethod compile-ir ((inst ir-jump))
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(unless (eql (next (iblock inst))
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(first (destinations inst)))
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(emit-asm-instruction :opcode #x4C
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:operand (first (destinations inst))
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:byte-length 3))
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(setf *last-instruction* '(:jump)))
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(defmethod compile-ir ((inst ir-if))
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(let ((next-iblock (next (iblock inst)))
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(then-iblock (first (destinations inst)))
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(else-iblock (second (destinations inst))))
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;; With how the midstage is built, the true case's block comes immediately
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;; after the IF, and therefore we should branch on false. This assert
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;; ensures that this assumption become false without us noticing.
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;; We implicitly fall through to THEN-BLOCK in the event of no branch.
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(assert (eql next-iblock then-iblock))
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(emit-load-bool (input inst))
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(emit-asm-instruction :opcode #xD0
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:operand else-iblock
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:byte-length 2)
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(setf *last-instruction* '(:conditional))))
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(defmethod compile-ir ((inst ir-test-equal))
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(emit-load-data (first (inputs inst)))
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(if (eql (strategy (allocation-details (second (inputs inst))))
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:constant)
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(emit-cmp :immediate (ir-constant-value (second (inputs inst))))
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(emit-cmp :address (data-reference (second (inputs inst)))))
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(emit-store-bool (output inst)))
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(defmacro do-asm-objects ((asm-obj start-asm-obj) &body body)
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`(loop :for ,asm-obj := ,start-asm-obj :then (next ,asm-obj)
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:until (null ,asm-obj)
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:do (progn
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,@body)))
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(defun link-compute-addresses (start-instruction origin-address)
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"First linking pass, computes the addresses of all labels."
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(let ((address origin-address))
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(loop :for asm-obj := start-instruction :then (next asm-obj)
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:until (null asm-obj)
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:do (setf (address asm-obj) address)
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:when (typep asm-obj 'asm-instruction)
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:do (incf address (byte-length asm-obj)))
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(values start-instruction address)))
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(defun link-resolve-references (start-instruction)
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(flet ((resolve-iblock (asm-obj)
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(setf (operand asm-obj)
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(multiple-value-bind (label existsp)
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(gethash (name (operand asm-obj))
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*asm-labels*)
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(unless existsp
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(error "Failed to resolve label ~A"
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(name (operand asm-obj))))
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label))))
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(loop :for asm-obj := start-instruction :then (next asm-obj)
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:until (null asm-obj)
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:when (typep asm-obj 'asm-instruction)
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:do (case (opcode asm-obj)
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((#x10 #x30 #x50 #x70 #x90 #xb0 #xd0 #xf0)
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;; Relative branches
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(when (typep (operand asm-obj) 'iblock)
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(resolve-iblock asm-obj))
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;; - 2 is to offset for the branch instruction's length
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(let* ((offset (- (address (operand asm-obj)) (address asm-obj) 2)))
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(setf (operand asm-obj) (ldb (byte 8 0) (the (signed-byte 8) offset)))))
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(t
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(when (typep (operand asm-obj) 'iblock)
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(resolve-iblock asm-obj))
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(when (typep (operand asm-obj) 'asm-label)
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(setf (operand asm-obj) (address (operand asm-obj))))
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(when (typep (operand asm-obj) 'asm-function)
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(setf (operand asm-obj) (address (operand asm-obj)))))))))
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(defun link-assembly (start-instruction origin-address)
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(link-compute-addresses start-instruction origin-address)
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;; TODO: Branch correction
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(link-resolve-references start-instruction)
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start-instruction)
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(defun compile-iblock (iblock)
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(emit-asm-label (unique-name iblock))
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(do-instructions (inst iblock)
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(compile-ir inst)))
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(defun compile-iblocks (start-iblock)
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(let ((*asm-head* nil)
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(*asm-foot* nil)
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(*asm-labels* (make-hash-table :test #'equal)))
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(do-iblocks (iblock start-iblock)
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(compile-iblock iblock))
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(link-assembly *asm-head* #xC000)
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*asm-head*))
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(defun compiled-bytes (start-instruction)
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(declare (optimize (debug 3)))
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(loop :for asm-obj := start-instruction :then (next asm-obj)
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:do (loop :until (or (null asm-obj) (typep asm-obj 'asm-instruction))
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:do (setf asm-obj (next asm-obj)))
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:until (null asm-obj)
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:append (list (opcode asm-obj))
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:when (> (byte-length asm-obj) 1)
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:append (ecase (byte-length asm-obj)
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(2 (list (the (unsigned-byte 8) (operand asm-obj))))
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(3 (list (ldb (byte 8 0)
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(the (unsigned-byte 16) (operand asm-obj)))
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(ldb (byte 8 8)
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(the (unsigned-byte 16) (operand asm-obj))))))))
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(defun quick-and-dirty-test-compile (text &key print-ir-p print-alloc-p make-asm-p)
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(with-input-from-string (source-stream text)
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(let ((*token-stream* (make-token-stream (tokenize source-stream))))
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(let ((rb (with-compilation-setup (root-block builder)
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(compile-node (match-syntax program) builder)
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root-block)))
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(do-iblocks (ib rb)
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(optim-reorder-arguments ib)
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(optim-direct-variable-use ib)
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(optim-call-duplicate-args ib)
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(optim-remove-unused ib))
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(let ((allocations (allocate-values rb)))
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(optim-reuse-temporary-slots rb allocations)
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(when print-ir-p
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(print-iblocks rb)
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(terpri))
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(when print-alloc-p
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(loop :for allocation :in allocations
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:do (format t "~%~A - ~A~{ - ~A~}"
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(data allocation)
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(strategy allocation)
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(unless (null (varvec-index allocation))
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(list (varvec-index allocation)))))
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(terpri))
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(when make-asm-p
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(with-variable-allocations allocations
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(compile-iblocks rb))))))))
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