56 lines
1.7 KiB
Racket
56 lines
1.7 KiB
Racket
#lang racket
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(provide cvar-to-bril)
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(require (prefix-in bril: bril/lang))
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(require "cvar.rkt")
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(define (cvar-to-bril program)
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(match program
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[(CProgram _ body)
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(bril:Program (list
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(bril:Function "main" '() '()
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(apply append (map cvar-labeled-seq-to-bril body)))))]))
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(define (cvar-labeled-seq-to-bril labeled-seq)
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(match labeled-seq
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[(cons label seq)
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(cons
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(bril:Label (symbol->string label))
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(cvar-seq-to-bril seq))]))
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(define (cvar-seq-to-bril seq)
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(match seq
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[(Seq stmt tail)
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(append
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(cvar-stmt-to-bril stmt)
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(cvar-seq-to-bril tail))]
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[(Return var)
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(list (bril:EffectInstr 'return (list (symbol->string (Var-name var)))
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'() '()))]))
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(define (cvar-stmt-to-bril stmt)
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(match stmt
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[(Assign (Var varname) rhs) (generate-bril-instrs (symbol->string varname) rhs)]))
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(define (generate-bril-instrs dest expr)
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(match expr
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[(Int n)
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(list (bril:ConstantInstr dest (bril:Type 'int) n))]
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[(Prim '+ (list (Var v1) (Var v2)))
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(list (bril:ValueInstr 'add dest (bril:Type 'int)
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(list (symbol->string v1)
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(symbol->string v2))
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'() '()))]
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[(Prim '- (list (Var v1)))
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(list (bril:ConstantInstr dest (bril:Type 'int) 0)
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(bril:ValueInstr 'sub dest (bril:Type 'int)
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(list dest
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(symbol->string v1))
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'() '()))]
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[(Prim '- (list (Var v1) (Var v2)))
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(list (bril:ValueInstr 'sub dest (bril:Type 'int)
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(list (symbol->string v1)
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(symbol->string v2))
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'() '()))]))
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