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Type Inference Example -- 1 source text: x:=1; z := y < x Abstract Syntax Tree:

;. :=. :=. x. 1. z. <. x. y. Type Inference Example -- 1 source text: x:=1; z := y < x Abstract Syntax Tree:. stmts = stmts ‘;’ stmt;. assignment = vars ‘:=‘ exprs;. relation = sum ‘<‘ sum;. b logical i integer r real. ;. :=. :=. x. 1. z. <. x. y.

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Type Inference Example -- 1 source text: x:=1; z := y < x Abstract Syntax Tree:

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  1. ; := := x 1 z < x y Type Inference Example -- 1 source text: x:=1; z := y < x Abstract Syntax Tree: stmts = stmts ‘;’ stmt; assignment = vars ‘:=‘ exprs; relation = sum ‘<‘ sum; b logical i integer r real

  2. ; := := x 1 z < x y Type Inference Example -- 2 source text: x:=1; z := y < x initial state: symbol table

  3. ; := := x 1 z < x y Type Inference Example -- 3 source text: x:=1; z := y < x visit 1: symbol table

  4. ; := := x 1 z < x y Type Inference Example -- 4 source text: x:=1; z := y < x visit 1: x/left/bir symbol table

  5. ; := := x 1 z < x y Type Inference Example -- 5 source text: x:=1; z := y < x return: bir x/left/bir symbol table

  6. ; := := x 1 z < x y Type Inference Example -- 6 source text: x:=1; z := y < x visit 2: x/left/bir symbol table i

  7. ; := := x 1 z < x y Type Inference Example -- 7 source text: x:=1; z := y < x return: i x/left/i symbol table

  8. ; := := x 1 z < x y Type Inference Example -- 8 source text: x:=1; z := y < x return: x/left/i symbol table

  9. ; := := x 1 z < x y Type Inference Example -- 9 source text: x:=1; z := y < x visit 2: x/left/i symbol table

  10. ; := := x 1 z < x y Type Inference Example -- 10 source text: x:=1; z := y < x visit 1: z/left/bir x/left/i symbol table

  11. ; := := x 1 z < x y Type Inference Example -- 11 source text: x:=1; z := y < x return: bir z/left/bir x/left/i symbol table

  12. ; := := x 1 z < x y Type Inference Example -- 12 source text: x:=1; z := y < x visit 2: z/left/bir x/left/i symbol table

  13. ; := := x 1 z < x y Type Inference Example -- 13 source text: x:=1; z := y < x visit 1: y/right/ir z/left/bir x/left/i symbol table

  14. ; := := x 1 z < x y Type Inference Example -- 14 source text: x:=1; z := y < x return: y/right/ir z/left/bir x/left/i ir symbol table

  15. ; := := x 1 z < x y Type Inference Example -- 15 source text: x:=1; z := y < x visit 2: y/right/ir z/left/bir x/leftright/i i symbol table

  16. ; := := x 1 z < x y Type Inference Example -- 16 source text: x:=1; z := y < x return: y/right/ir z/left/bir x/leftright/i i~=ir symbol table

  17. ; := := x 1 z < x y Type Inference Example -- 17 source text: x:=1; z := y < x visit 1 (again): y/right/i z/left/bir x/leftright/i symbol table

  18. ; := := x 1 z < x y Type Inference Example -- 18 source text: x:=1; z := y < x return: b y/right/i z/left/bir x/leftright/i symbol table

  19. ; := := x 1 z < x y Type Inference Example -- 19 source text: x:=1; z := y < x return: b y/right/i z/left/b x/leftright/i symbol table

  20. ; := := x 1 z < x y Type Inference Example -- 20 source text: x:=1; z := y < x return: y/right/i z/left/b x/leftright/i symbol table

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