We see a need to stardarize an intermediate representation (IR) for those working on static analysis tools for JavaScript. Our hope that different researchers will contribute translators to JSIR that run on different platforms such as Java, .NET, and, finally, JavaScript itself.
Since it is in many cases desirable to do program analysis enterily in the browser, it should also be possible to create JSIR by making REST calls to a server responsible for converting. One possibilty for the AST format supported by Esprima.
Below is an ANTLR v4 grammar for JSIR. Note that we use the /* @name {RHS}*/
syntax to help code generation tools give meaninful human-readable names to various data members within the generated classes
or structures.
You can also download the Antlr file.
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/* - SSA-numbered bindings - lexical scopes - fully dismantles control flow - support for CFGs with Entry and Exit BasicBlocks - the Blocks array in a ControlFlowGraph does NOT contain Entry and Exit BasicBlocks */ /* @namespace {Microsoft.CodeAnalysis.JSIRGrammar} */ grammar JSIR; prog : Program; Mode : 'strict' | 'non'; Boolean : 'true' | 'false'; Eval : 'eval'; Null : 'null'; This : 'this'; Undefined : 'undefined'; Number : NUMBER+; Value : Number | ConstantString | Boolean | Eval | Null | This | Undefined | Binding | FunctionReference ; Program : GlobalScope /* @name {functionDeclarations}*/FunctionDeclaration* ControlFlowGraph; Statement : Assignment | Call | DebuggerStatement | ReturnStatement ; Call : StaticMethodCall | MethodCall | ConstructorCall ; Assignment : SimpleAssignment | FieldAssignement | ArrayAssignment ; SimpleAssignment : /* @name {LHS}*/Binding '=' /* @name {RHS}*/Expression; FieldAssignement : /* @name {LHS}*/Binding '.' /* @name {field}*/Binding '=' /* @name {RHS}*/Binding; ArrayAssignment : /* @name {LHS}*/Binding '[' /* @name {index}*/ Binding ']' '=' /* @name {RHS}*/Binding; StaticMethodCall : /* @name {LHS}*/Binding '=' /* @name {target}*/Binding '(' /* @name {arguments}*/Binding (',' /* @name {arguments}*/Binding)*')' ';'; MethodCall : /* @name {LHS}*/Binding '=' /* @name {target}*/Binding '.' /* @name {field}*/STRING '(' /* @name {parameter}*/Binding ? (',' /* @name {parameter}*/Binding)* ')'; ConstructorCall : /* @name {LHS}*/Binding '=' 'new' /* @name {function}*/Binding '(' /* @name {parameter}*/Binding ? (',' /* @name {parameter}*/Binding)* ')' ; Binding : Type /* @name {variable}*/ID '_' Version;// Scope; // This is an uninterpreted type Type : STRING; /* This is intended to represent the SSA version */ Version : NUMBER+; Scope : GlobalScope | LocalScope; GlobalScope : /* @name {bindings}*/Binding (/* @name {bindings}*/Binding)* ; LocalScope : 'var' '{' /* @name {parent}*/Scope '}' /* @name {bindings}*/Binding (/* @name {bindings}*/Binding)* ';'; Expression : FunctionDeclaration | ObjectLiteral | ArrayLiteral | ArrayReference | FieldReference | PropertyNameIterator | BinaryOperation | UnaryOperation | PhiFunction | IotaFunction | DeleteOperation | Value ; FunctionDeclaration: 'function' /* @name {name}*/ID '(' /* @name {arguments}*/Binding (',' /* @name {arguments}*/Binding)* ')' '{' Mode // entry and exit blocks are not included in the list blocks above /* @name {declarations}*/LocalScope /* @name {nestedFunctions}*/FunctionDeclaration* ControlFlowGraph '}' ; ControlFlowGraph : /* @name {entryBlock}*/BasicBlock /* @name {blocks}*/BasicBlock* /* @name {exitBlock}*/BasicBlock ; KeyValuePair : /* @name {field}*/STRING ':' /* @name {value}*/Value; ObjectLiteral: '{' /* @name {pair}*/KeyValuePair (',' /* @name {pair}*/KeyValuePair)* '}'; ArrayLiteral : '[' /* @name {elements}*/Binding (',' /* @name {elements}*/Binding)* ']'; ArrayReference: /* @name {target}*/Binding '[' /* @name {index}*/Binding ']'; FieldReference: /* @name {target}*/Binding '.' /* @name {field}*/STRING; PropertyNameIterator: 'nextProperty' '(' /* @name {object}*/ Binding ',' /* @name {previousPropName}*/ Binding ')' ; DeleteBinding: 'delete' /* @name {target}*/Binding '.' /* @name {field}*/Binding; DeleteArrayReference: 'delete' /* @name {target}*/Binding '[' /* @name {index}*/Binding ']'; DeleteValue : 'delete' Binding; BinaryOperation : /* @name {LHS}*/Binding BinaryOperator /* @name {RHS}*/Binding; UnaryOperation : UnaryOperator Binding; PhiFunction : 'phi' '(' /* @name {bindings}*/Binding (',' /* @name {bindings}*/Binding)* ')' ; IotaFunction : 'iota' '(' /* @name {variable}*/ID ')' ; FunctionReference : 'ref' '(' /* @name {variable}*/ID ')' ; DebuggerStatement : 'debugger'; ReturnStatement : 'return' /* @name {value} */Binding; ConstantString : STRING; Label: STRING; Jump : SimpleGoto | ConditionalGoto | ThrowTo; SimpleGoto : 'goto' /* @name {labels}*/Label (',' /* @name {labels}*/Label)*; ConditionalGoto : 'goto' /* @name {predicate}*/Binding /* @name {label1}*/Label /* @name {label2}*/Label; ThrowTo : 'throwto' Binding; BasicBlock : RegularBasicBlock | ExceptionalBasicBlock; // EmptyBasicBlock | //EmptyBasicBlock : Label Jump; RegularBasicBlock : Label Statement* Jump; ExceptionalBasicBlock : 'set-catch-label' Label Binding Statement* Jump; UnaryOperator : '!'| '-' | '+' | '~'| 'typeof' | 'void' | '++'| '--'; BinaryOperator : '+'|'-'|'^'|'|'|'*'|'/'|'%'| '&&' | '||' | '|' | '&' | '>>' | '<<'| '>>>' | '^' | 'instanceof' | '==' | '===' | '!=' | '!==' ; /////////////////////////////// STRING : '"' StringCharacters? '"' | '\'' StringCharacters? '\'' ; StringCharacters : ('a'..'z')|('A'..'Z')|('0'..'9') ; fragment NUMBER : '0'..'9'; fragment ID : ('a'..'z' | 'A'..'Z' | '_' | '-' | 'a'..'z' | 'A'..'Z' | '$' | NUMBER)+; //WS : ('\r'|'\n'|'\t') -> skip ; //COMMENT : ( // ('#'| '//') ~[\r\n]* '\r'? '\n' // | '/*[' .*? ']*/ // ) -> skip ; |