Type Inference Example -- 1 source text: x:=1; z := y < x Abstract Syntax Tree: ; := < x 1 z y x assignment = vars ‘:=‘ exprs; stmts = stmts ‘;’ stmt;

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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