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Lattakia (A language for Lattices)

Lattakia (A language for Lattices). Wael Salloum Hebatallah Elfardy Katherine Scott Li Yifan. What’s a lattice?. A more detailed example. Conditioned predicate. x : 5. [x> y] x= x-y. y: 10. z: x. x=y-x. Unconditioned predicate. Altlat. Labeled lattice. Seqlat.

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Lattakia (A language for Lattices)

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  1. Lattakia (A language for Lattices) WaelSalloum HebatallahElfardy Katherine Scott Li Yifan

  2. What’s a lattice?

  3. A more detailed example Conditioned predicate x: 5 [x> y] x= x-y y: 10 z: x x=y-x Unconditioned predicate Altlat Labeled lattice Seqlat ..Code for the above lattice x: 5; y: 10; [x>y ] x = x-y | y=y+5; z:x;

  4. Lattakia in a Nutshell ** A MULTI LINE COMMENT ** .. A single line comment foo = (1;2;3); .. a sequence lattice of integers bar = (1.0|2.0|3.0); .. an alternative lattice of floats baz = (a:1|b:2|c:3); .. a labeled alt lat print(baz.a); .. access a and print it print(foo{0}) .. Prints 1 print(bar[0]) .. Prints 1.00 deffnord(x;y) = ([x>=y] print(x); | print(y); ); .. a function definition herp = 10; derp = 20; let fnord(herp;derp); .. Function application prints 10 - MORE HERE 

  5. Quick Sort Example ** Perform quicksort on a seqlat of integer values. ** def quicksort(input) = ( let (less = (); greater = () ); .. create two local variables [input.length <= 1] return = input | .. if we have a single value return let pivot = input[0]; .. create a pivot let input[0] = epsilon; foreach(x; input; .. for each value in the array [x < pivot] less = (less; x) .. create a less than lattice | greater = (greater; x) .. and a greater than lattice ); .. now recursively sort the new lattices and return a lattice (quicksort(less); pivot; quicksort(greater)); ).return; .. return the input values = (42;7;18;6;1;-3;15;30); let sorted = quicksort(values); foreach(x; sorted; print(x); print("\n"); );

  6. Compiling & Running GCD ** GCD - calculate the greatest common denominator. ** defgcd(x; y) = ( [y == 0] x | [y != 0 ] gcd(y, x % y); ); a = 35; b = 49; print("GCD of 35 and 49 is "); print(gcd(a; b)); print("\n"); > ./latte < GCD.lat GCD of 35 and 49 is 7 >

  7. Initial Design Source Code Scanner (tokens) Parser (Build AST) Symbol Table Generation (from AST) Semantic Anal. (Clean AST & ST) Java Source Code Generation (from OCaml) JVM Execution AST & Symbol Table Result Latte Translator Lattakia Java Library

  8. Revised Design Source Code Scanner (tokens) Parser (Generate Lattice / AST) Semantic Analysis (cleaned lattice) Evaluation (evaluate lattice) Printer (print to stdout) Lattice & Symbol Table Result Latte Interpreter

  9. Lessons Learned • Writing a compiler isn’t that bad… writing one for a complex language is. • Ocaml is actually kinda cool. • Translation is difficult when you are trying to hit a moving target. • Things get done when you put everyone in a room. • Keep it simple stupid

  10. Lattice Construction LatticeType Lattice Fields DataStructTypeType altlatFields alternatives: latticeFields each: bool DataTypeType Int / Float / Boolean / String / General/UnresolvedType / Diverse / MismatchType latticeNatureType |DataLat | Hashtable | Object | Function seqlatFields expr: exprFields; elements: latticeFieldslist symbols: symbolTableType StructureTypeType Seq/ Alt / Wrd / Undetermined exprValueType |ConstValueconstantType | LatticeValuelatticeFields | NotEvaluated predicateFields expr: exprFields; condition: exprFields; exprFields exprDataStructType:dataStructTypeType exprCode: exprCodeTypeexprEval: exprValueTypeexprChanged: bool expDependers: exprFields expDependees: exprFields exprCodeType | ConstExprconstantType| OpExproperationType | NameListExprnameListType | LatticeExprlatticeFields operationType operator: operatorType operand1: exprFields operand2: exprFields constantType | StringLiteral | IntLiteral | FloatLiteral | Epsilon | Nil | True | False

  11. Environment / Symbol Table envType labelIdGenerator: int parentStackLabelIdGenerator: intlist errorTable: errorTypelist worningTable: errorTypelist namesOfCurrLat: symbolTableType lineNumber: int; charOffset: int errorType errMessage: errorMessageType errPlace: exprCodeTypeoption lineNum: int offset: int symbolTableType parent : symbolTableTypeoption hash : symbolTypeStringMap.t symbolType symName: string symDataStructType: dataStructTypeType symValue: symbolValueType symbolScope: symbolScopeType parameterNameList: string list option parameterTypeList: dataStructTypeTypelist dependers: exprFields ref list dependees: exprFields ref list errorMessageType | SemParamListTypeSignMismatch | SemUndefinedIdentifier | SemIdentifierMultipleDefinition | SemTypeMismatch | SemPredicateTypeNotBoolean | LexUndefinedSymbol | SynParseError errorCategoryType | Worning | Semantic | Syntactic | Lexical | Runtime symbolValueType | LabelIndex : int | LocalValueLattice: latticeFieldsref symbolScopeType |Label | Local | UnresolvedSymbol

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