'Type expression' diaporamas de présentation

Chap 6: Type Checking/Semantic Analysis

Chap 6: Type Checking/Semantic Analysis. Prof. Steven A. Demurjian Computer Science & Engineering Department The University of Connecticut 371 Fairfield Way, Unit 2155 Storrs, CT 06269-3155. steve@engr.uconn.edu http://www.engr.uconn.edu/~steve (860) 486 - 4818.

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Programming Fundamentals

Programming Fundamentals. The setw Manipulator. setw changes the field width of output. The setw manipulator causes the number (or string) that follows it in the stream to be printed within a field n characters wide, where n is the argument to setw(n).

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Programming Fundamentals

Programming Fundamentals. The setw Manipulator. setw changes the field width of output. The setw manipulator causes the number (or string) that follows it in the stream to be printed within a field n characters wide, where n is the argument to setw(n).

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Compiler Construction

Compiler Construction. Lecture 9 Type Checking. Type Checking (Chapter 6). Type Checking. TYPE CHECKING is the main activity in semantic analysis. Goal: calculate and ensure consistency of the type of every expression in a program If there are type errors, we need to notify the user.

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Compiler

Compiler. Chapter# 5 Intermediate code generation. Intermediate Code Generation. In the analysis-synthesis model of a compiler, the front end analyzes a source program and creates an intermediate representation, from which the back-end generates target code.

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Pertemuan 18 & 19 Semantic Analyzer (type checking)

Pertemuan 18 & 19 Semantic Analyzer (type checking). Matakuliah : T0174 / Teknik Kompilasi Tahun : 2005 Versi : 1/6. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Mahasiswa dapat menjelaskan proses type checking dan peranannya dalam compiler (C2)

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Type Checking

Type Checking. Legality checks Operator determination Overload resolution. Type as a synthesized attribute. Expr ::= Expr + Term if Etype (Expr 2 ) = Etype (Term) then Etype (Expr 1 ) := Etype (Expr 2 ); else Etype (Expr1) = Any_Type;

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Type Checking

Type Checking. Legality checks Operator determination Overload resolution. Type as a synthesized attribute. Expr ::= Expr + Term if Etype (Expr 2 ) = Etype (Term) then Etype (Expr 1 ) := Etype (Expr 2 ); else Etype (Expr1) = Any_Type;

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Chapter 6

Chapter 6. Type Checking. The compiler should report an error if an operator is applied to an incompatible operand. Type checking can be performed without running the program. It is a static check as opposed to a dynamic check which is performed during run time. Examples:

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Type Checking

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Building Java Programs

Building Java Programs. Chapter 3 Lecture 3-2: Return values, Math , and double reading: 3.2, 2.1 - 2.2. Java's Math class. Math.abs(-42). -42. 42. main. 2.71. 3. Math.round(2.71). Return. return : To send out a value as the result of a method.

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Type Checking

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Building Java Programs

Building Java Programs. Chapter 3 Lecture 3-2: Return values, Math , and double reading: 3.2, 2.1 - 2.2. Java's Math class. Math.abs(-42). -42. 42. main. 2.71. 3. Math.round(2.71). Return. return : To send out a value as the result of a method.

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Conversions of the type of the value of an expression

Conversions of the type of the value of an expression. ANSI-C. Careful rules to follow. You should know the type of the resulting expression You should match the type of the resulting expression with the expected type of The variable being assigned

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