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| | Abstract syntax tree - Wikipedia, the free encyclopedia |
 | | In computing, it is used in a parser as an intermediate between a parse tree and a data structure, the latter which is often used as a compiler or interpreter's internal representation of a computer program while it is being optimized and from which code generation is performed. | | | In computer science, an abstract syntax tree (AST) is a finite, labeled, directed tree, where the nodes are labeled by operators, and the edges represent the operands of the node operators. | | | Creating an AST in a parser for a language described by a context free grammar, as nearly all programming languages are, is straightforward. |
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http://en.wikipedia.org/wiki/Abstract_syntax_tree
(302 words)
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| | Syntax - Encyclopedia.WorldSearch |
| | The analysis of programming language syntax usually entails the transformation of a linear sequence of tokens (a token is akin to an individual word or punctuation mark in a natural language) into a hierarchical syntax tree (abstract syntax trees are one convenient form of syntax tree). | | | In computer languages, syntax can be extremely rigid, as in the case of most assembler languages, or less rigid, as in languages that make use of "keyword" parameters that can be stated in any order. | | | The usage of syntax in computer science has evolved from its related usage in linguistics, especially in the subfield of programming language design. |
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http://encyclopedia.worldsearch.com/syntax.htm
(603 words)
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| | Java Threads - Re: Abstract Syntax Trees |
| | Abstract Syntax Tree(AST) is the hierarchical representation of the semantic features of a program based on its abstract syntax. | | | Abstract syntax deals with only the semantic entities, unlike the concrete syntax which also describes what kind syntactic symbols will be used to describe the semantic features. | | | Yes, AST has the "same semantics as the source language they represent." This is an advantage over the byte-code so that you can quickly establish the intention of the program at every level. |
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http://www.cs.kent.ac.uk/projects/ofa/java-threads/3.html
(514 words)
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| | [No title] |
| | Abstract Syntax : The model form of a software artifact expressed in the modeling language such as UML for describing the software language in which software artifacts are written. | | | The AST is a formal representation of the syntactical structure of software that is more amenable to formal analysis techniques than is the concrete or surface syntax of software. | | | ASTs are generally augmented with additional analyses layers, such as type analysis, control-flow analysis or data-flow analysis (to support code optimization). |
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http://www.omg.org/docs/admtf/05-01-01.txt
(2453 words)
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| | Intermediate Representation |
| | Abstract syntax tree represents the abstract syntax of the source language conveying the phrase structure of the source program, with all the parsing issues resolved but without semantic interpretation. | | | During the parse, information generated in one part of the parse tree (often called attributes) may be required in another part of the tree and it is useful to provide for information to flow both up the tree toward the root (synthesized attributes) and a down from the root toward the leaves (inherited attributes). | | | Concrete parse tree represents the concrete syntax of the source language. |
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http://cs.wwc.edu/~aabyan/464/abstract.html
(604 words)
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| | XIDEK: Interpreter Development Kit -- Abstract Syntax Tree Definitions |
| | The stackNode function is used by the constructor wrapper functions to record the node pointer on the nodeStack. | | | An abstract syntax tree is a condensed form of parse tree which omits elements such as parentheses and semicolons, which are syntactically important but have no semantic value. | | | A parse tree is a representation of the information obtained by parsing a particular input. |
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http://www.parsifalsoft.com/examples/xidek/XIDEK/doc/astdefs.htm
(3202 words)
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| | [No title] |
| | Introduction Ast is a generator for program modules that define the structure of abstract syntax trees and provide general tree manipulating procedures. | | | This can Ast 24 be done either with the attribute evaluator generator ag [Gro89] which under- stands ast specifications extended by attribute computation rules and processes the trees generated by ast or by hand-written programs that use an ast generated module. | | | Ast has an option that requests to write a binary version of the tree definition to a file whose name is derived from the name given after the keyword VIEW by appending the suffix ".TS" (Default: "Tree.TS"). |
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http://www.cs.wichita.edu/~rodney/cocktail/doc/doc.doc/ast.doc
(8362 words)
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| | Computer Science 68, Notes 01-16 |
| | You should still think of the grammar as generating abstract syntax trees, though, not as a grammar for strings (as a grammar for strings, it would be ambiguous). | | | This smaller tree is called an abstract syntax tree, and it discards all the remnants of the concrete syntax to focus on the program's essential tree structure. | | | The language's abstract syntax defines a language as a set of trees (abstract syntax trees), ignoring a program's string representation. |
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http://www.cs.dartmouth.edu/~cs68/04w/notes-01-16.html
(1166 words)
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| | Concrete vs. Abstract Syntax |
| | The abstract syntax of an implementation is the set of trees used to represent programs in the implementation. | | | The concrete syntax of a programming language is defined by a context free grammar. | | | The result of this is a tree which can be further disected by using simple array referencing. |
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http://pico.vub.ac.be/mc/absconc.html
(471 words)
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| | Abstract Syntax Trees |
| | is a var tree node for the function name. | | | It may be NULL (if the ID is not an array). | | | There are three basic types of trees you need to deal with: |
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http://cerebro.xu.edu/csci310/02s/ast.html
(330 words)
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| | Project - Abstract Syntax Trees |
| | Abstract Syntax Trees are a "pared down" parse tree. | | | Hand in (at a minimum) : your source files, the input programs, and the output AST's. | | | The output need not look exactly like that above, but you should print out line numbers and somehow show the ast structure. |
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http://www.cs.wpi.edu/~kal/PLT/PLTprojectast.html
(370 words)
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| | [No title] |
| | This is the parse tree format that is used in the ASF+SDF Meta-Environment. | | | The parser outputs parse trees or parse forests if there is more then one possible parse tree. | | | ================================================================================ ABSTRACT SYNTAX ================================================================================ * ATerm The foundation of XT is the ATerm format for exchange of structured data such as abstract syntax trees. |
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http://www.ccs.neu.edu/home/dherman/browse/shared/notes/macro-rg/metaborg.txt
(632 words)
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| | Quotations for creating abstract syntax trees |
| | The syntax used in quotations use the revised concrete syntax (chapter 6) with a system of ``antiquotations'' to insert expressions or patterns of the language in the concrete syntax, to make all possible values of the syntax tree nodes. | | | In the syntax tree, there is no node directly representing lists. | | | Syntax tree nodes for language patterns, of type |
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http://pauillac.inria.fr/caml/camlp4/manual/manual010.html
(541 words)
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| | Comp 212 - Recursive Descent Parsing |
| | How the AST is created is a variant as there are many ways to parse the input stream. | | | Grammars are used to define the syntax of finite sequences of tokens. | | | The set of all finite sequences of tokens that conform to the given grammar rules is called the language generated by the given grammar. |
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http://www.owlnet.rice.edu/~comp212/04-spring/lectures/30
(1090 words)
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| | 9.1 Abstract syntax trees (AST) |
| | Note that the AST syntax is rather general, since application nodes may be labelled by an arbitrary identifier (but not a metavariable), and operators have no fixed arity. | | | The AST expressions are conceptually divided into two classes: constructive expressions (those that can be used in parsing rules) and destructive expressions (those that can be used in pretty printing rules). | | | Indeed, if the AST to generate corresponds to a term that already has a syntax, one can call a grammar to parse it and to return the AST result. |
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http://carpanta.dc.fi.udc.es/docs/coq-6.2/node.2.0.0.html
(765 words)
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| | CS 431 -- Summer 2004 -- Lab 3 |
| | class is an implementation of a tree node; it has methods to help build a tree. | | | You will gain experience with bottom-up parsing and the structure of the Java programming language by implementing the construction of abstract syntax trees. | | | file, you are to design and implement an abstract syntax tree (AST). |
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http://userfs.cec.wustl.edu/~cs431su/Labs/Lab3
(557 words)
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| | WWW.COMBO.ORG: COMPILER WRITER'S TOOLBOX |
| | It supports language recognition, definition of abstract syntax trees, construction of tree walkers based on pattern matching, smart traversal, simple unparsing for source-to-source translation, and optimal code selection for microprocessors. | | | It is well suited for the definition of abstract syntax trees and the implementation of tree walkers. | | | It also supports match statements that process these data using tree pattern matching. |
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http://www.combo.org
(184 words)
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| | Automized Generation of Typed Syntax Trees Via XML |
| | The XANTLR/TDOM project is an implementation of a ``typed'' XML Document Object Model initially used to represent abstract syntax trees in a compiler project. | | | Tree classes, SAX event receivers, visitor classes and DTD are automatically derived from a sparsely annotated ANTLR grammar. | | | @inproceedings{ltw01a, author = "Baltasar Trancon y Widemann and Markus Lepper and Jacob Wieland and Peter Pepper", title = "Automized Generation of Typed Syntax Trees Via XML", abstract = "The XANTLR/TDOM project is an implementation of a ``typed'' XML Document Object Model initially used to represent abstract syntax trees in a compiler project. |
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http://uebb.cs.tu-berlin.de/cgi/singlelit.cgi?citation=ltw01a&
(243 words)
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| | HPGP Project Tasks |
| | How abstract syntax trees are represented and handled in memory (Wolfgang Stöcher). | | | Programs are textual descriptions of abstract syntax trees. | | | How abstract syntax trees are represented and handled on file (Mircea Marin). |
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http://www.risc.uni-linz.ac.at/projects/basic/hpgp/tasks
(321 words)
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| | Dynamic Probe Class Library Programming Guide |
| | The term "abstract syntax tree" is one we have borrowed from compiler technology. | | | Compilers create abstract syntax trees from a program's source code as an intermediary stage before manipulating and converting them into executable instructions. | | | The DPCL system needs to create these abstract syntax tree data structures for the same reason that compilers do -- freed from a particular syntactic representation, they can be more easily converted into executable instructions. |
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http://www.pdc.kth.se/doc/SP/manuals/ppe.html-3.1/d3d50mst21.html
(2360 words)
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| | Module erl_prettypr |
| | type) is passed the current syntax tree node, the context, and a continuation. | | | Prettyprint-formats an abstract Erlang syntax tree as text. |
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http://user.it.uu.se/~richardc/edoc/doc/syntax_tools/erl_prettypr.html
(570 words)
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| | Dynamic Probe Class Library Programming Guide |
| | These data structures are called "abstract syntax trees" (as opposed to simply "syntax trees") because they are removed from the syntactic representation of the code. | | | Compilers need to create abstract syntax trees from a program's source code as an intermediary stage before manipulating and converting the data structure into executable instructions. | | | Since the DPCL system also needs to create executable instructions (for insertion into one or more target application processes), it also needs to create these abstract syntax trees. |
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http://www.umiacs.umd.edu/~jhu/DOCS/SP/docs/pe/html/d3d50mst47.html
(5175 words)
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| | [No title] |
| | Apart from the rather awful syntax, the idea is that separate classes are defined for individual features (decorations), which are then combined through the constructors. | | | It is a straightforward translation of the AST grammar. | | | For the return value, the parsing routine may add or modify the list of abstract syntax trees and will generally "remove" tokens it has processed. |
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http://condor.depaul.edu/~glancast/447class/docs/lecMay19.html
(3582 words)
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| | CCIS > Undergraduate > Course Descriptions |
| | Examines syntax trees; staticsemantics; type checking; typical machine architectures and theirsoftware structures; code generation; lexical analysis; and parsingtechniques. | | | Possibilities include: abstract data type (ADT) of abstract syntax trees (ASTs) ADTs for symbols and compile-time environments lexical analyzer parser type checker static attribution of details needed for code generation (e.g. | | | Studies the construction of compilers and integrates material fromearlier courses in programming languages, automata theory, computerarchitecture, and software design. |
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http://www.ccs.neu.edu/course/CSU665Charter.html
(306 words)
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| | Visitor Pattern |
| | Moreover, we could use the abstract syntax trees for pretty-printing, program restructuring, code instrumentation, and computing various metrics of a program. | | | It will need to perform operations on abstract syntax trees for "static semantic" analyses like checking that all variables are defined. | | | For example, a compiler that didn't use visitors might type-check a procedure by calling the TypeCheck operation on its abstract syntax tree. |
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http://www.swe.uni-linz.ac.at/research/deco/designPatterns/Visitor/visitor.abstract.html
(1357 words)
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| | Module erl_recomment |
| | The nodes of the syntax tree must contain valid position information. | | | The result is a corresponding syntax tree of type | | | , fails because the tree structure is ill-formed. |
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http://www.it.uu.se/research/group/hipe/edoc/doc/syntax_tools/doc/erl_recomment.html
(428 words)
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| | CASL/Summary-v0.99-draft -- C Concrete Syntax |
| | Translation to abstract syntax trees and pretty-printing using ASF+SDF are currently being implemented. | | | Christophe Tronche has developed a top-down, LL(2) parser, together with translation to abstract syntax trees and printing of these in a simple list format. | | | Mark van den Brand and Bjarke Wedemeijer have developed a grammar from which the ASF+SDF system can generate a (nondeterministic bottom-up) parser. |
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http://www.csl.sri.com/users/mosses/CoFI/Documents/CASL/Summary-v0.99-draft/index_118.html
(230 words)
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| | YAAB (Yet Another AST Browser): Using OCL to Navigate ASTs |
| | Central to the idea is to shift the analysis paradigm from a tree-based to an object-oriented paradigm, and to provide a meta-model decoupling the query language from the target language. | | | This paper presents the current status in implementing an OCL interpreter with the ability of querying an object model representing the abstract syntax tree, as well as some interesting applications, such as extracting software metrics or computing clones. | | | In the last decades several tools and environments defined and introduced languages for querying, navigating and transforming abstract syntax trees. |
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http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/iwpc/2003/1883/00/1883toc.xml&DOI=10.1109/WPC.2003.1199185
(268 words)
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| | Scale Compiler Clef AST |
| | The Clef AST is a High level representation of a program which is close to the original source program. | | | High level optimizations can modify the Clef AST to provide improved code generation. | | | High level analysis can influence lower level optimizations through the addition of Annotations |
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http://www-ali.cs.umass.edu/Scale/ast.html
(86 words)
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| | OCaml syntax trees |
| | Actually, you need to know the revised syntax (chapter 5) because it is the syntax used in these quotations. | | | (file ``mLast.mli''): it is of course always possible to create your syntax tree nodes by combining values of these types. | | | in defined in all semantic actions of the rules: Camlp4 grammar system and Camlp4 quotations of abstract syntax trees are made to work together. |
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http://pauillac.inria.fr/caml/camlp4/tutorial/tutorial006.html
(658 words)
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| | ASTLOG: A Language for Examining Abstract Syntax Trees |
| | Also, various second-order Prolog set-predicates may be implemented via manipulation of the current object, thus retaining an important feature without entailing that the database be dynamically extensible as the usual implementation does. | | | The model in which terms are matched against an implicit current object, rather than simply proven against a database of facts, leads to a distinct ``inside-out functional'' programming style that is quite unlike typical Prolog, but one that is, in fact, well-suited to the examination of trees. | | | R.F. Crew, "ASTLOG: A Language for Examining Abstract Syntax Trees," Proc. |
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http://research.microsoft.com/pubs/view.aspx?pubid=43
(237 words)
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| | Lecture 7 |
| | ML datatypes are very close to parse trees for grammars. | | | Where SML really wins is handling tree structures, such as abstract syntax trees. | | | SML is designed for manipulating abstract syntax trees. |
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http://klee.cs.depaul.edu/csc447/lecture7.html
(1383 words)
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| | [No title] |
| | Since the grammar is ambiguous, there are two parse trees for this program. | | | Once an abstract syntax tree has been created, it can be easily manipulated, e.g. | | | The ambiguous program can be rendered in two ways |
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http://www.cs.fsu.edu/~engelen/courses/COP502599/t33.html
(54 words)
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| | Exercises on abstract syntax trees |
| | This means that unary minus is defined in the grammar, but not in the syntax trees. | | | Study the code for parsing JOOS programs and building and weeding abstract syntax trees. | | | Write a better pretty printer that only outputs the minimal number of parentheses required to preserve the semantics of the expression. |
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http://www.sable.mcgill.ca/~hendren/520/Exercises/ast.html
(118 words)
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| | Homework 4 |
| | You may find it helpful to rewrite some of the rules in your grammar to make it easier to generate abstract syntax. | | | field to record the position in the source file that corresponds with each piece of abstract syntax. | | | In this assignment, we will add actions to our MiniJava parsers to build abstract syntax trees, as described on pages 98-100. |
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http://www.cs.fiu.edu/~smithg/cop5621/chap4.html
(174 words)
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| | Ulm's Oberon System: obload |
| | Objects generated by the compiler are persistent objects representing abstract syntax trees (either architecture-independent or architecture-dependent), or ready-to-run machine code. | | | By default, architecture-independent abstract syntax trees of modules will not be stored. | | | load an object containing an architecture-independent abstract syntax tree, or, if an architecture was specified, ready-to-run machine code of |
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http://www.mathematik.uni-ulm.de/oberon/0.5/tools/man/obload.html
(610 words)
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| | CS352 Compilers: Fall 2004 |
| | Download Java code for "straight-line" language abstract syntax trees, here. | | | Your interpreter should work with the unaltered abstract syntax tree classes we have provided, and with any proper | | | You will need manually built AST's (abstract syntax trees) stored in a class called |
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http://www.cs.purdue.edu/homes/brylow/cs352/Fall2004/Projects/Project1
(144 words)
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| | Comp.compilers: Building Abstract Syntax Trees from LL(1) Grammars |
| | Re: Building Abstract Syntax Trees from LL(1) Grammars no@mail.com (Capitaine Caverne) (2002-08-23) | | | Re: Building Abstract Syntax Trees from LL(1) Grammars thp@cs.ucr.edu (2002-08-23) | | | Another way of doing it would be to have the parser output the tokens |
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http://compilers.iecc.com/comparch/article/02-08-056
(330 words)
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| | Abstract Syntax Description Language |
| | Automatic generation of functions to read and write the data structures to disk in a machine and language independent way. | | | ASDL pickles can be interactively viewed and edited with a graphical browser, or pretty printed into a simple textual format. | | | The browser provides some advanced features such as display styles and tree based versions of standard unix tools such as |
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http://asdl.sourceforge.net
(247 words)
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| | T-Gen |
| | T-gen supports the generation of both top-down (LL) and bottom-up (LR) parsers, which will automatically generate derivation trees, abstract syntax trees, or arbitrary Smalltalk objects. | | | The simple specification syntax and graphical user interface enhance the learning, comprehension, and usefulness of T-gen. | | | It is written in Smalltalk and lives in the Smalltalk programming environment. |
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http://minnow.cc.gatech.edu/squeak/1419
(130 words)
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| | Hierarchical Multi-Dimensional Table Lookup for Model Compiler Based Circuit Simulation |
| | Expensive part of the computations represented by abstract syntax trees are identified and replaced by two-dimensional table lookup models. | | | An error-control based optimization algorithm is developed to generate table lookup models with the minimal amount of table data for a given accuracy requirement. | | | The method is based on an Abstract Syntax Tree representation of analytic equations. |
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http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/date/2004/2085/02/2085toc.xml&DOI=10.1109/DATE.2004.1269076
(253 words)
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| | 4.2 Building Abstract Syntax Trees in C |
| | An alternative method is to use just one generic tree structure to capture all possible tree structures. | | | It's a good idea to define a constructor for every kind of expression to simplify the task of constructing ASTs: | | | Unfortunately, when constructing a compiler, we need to define many tree-like data structures to capture ASTs for many different constructs, such as expressions, statements, declarations, programs etc, as well as type structures, intermediate representation (IR) trees, etc. This would require hundreds of recursive structs in C or classes in Java. |
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http://lambda.uta.edu/cse5317/notes/node25.html
(156 words)
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| | Contents |
| | 4.3 Gen: A Java Package for Constructing and Manipulating Abstract Syntax Trees |
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http://lambda.uta.edu/cse5317/notes/node1.html
(31 words)
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| | Template Haskell |
| | Template Haskell is an extension to Haskell 98 that allows you to do type-safe compile-time meta-programming, with Haskell both as the manipulating language and the language being manipulated. | | | what you would type when you write normal Haskell code, and abstract syntax trees. | | | These abstract syntax trees are represented using Haskell datatypes and, at compile time, they can be manipulated by Haskell code. |
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http://www.haskell.org/th
(773 words)
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| | Abstract syntax trees |
| | I need abstract classes java cannot be difference between abstract class and interface needs what is abstract art. | | | This website has information on example abstract cannot be abstract com. | | | modern abstract and abstract britney and human abstract and abstract desktop, abstract class java is not abstract painters. |
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http://www.furniture.mentorgate.com/abstract-syntax-trees.htm
(759 words)
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| | Abstract syntax tree |
| | LIDO is a specification language for abstract syntax trees. | | | LIDO requires that every type be represented by an identifier. | | | Thus it is not possible to use the type |
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http://ece-www.colorado.edu/~ecen4553/Reference/abstr/straight/node21.html
(133 words)
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| | 11.3 Code Generation from Abstract Syntax Trees |
| | A simple code generator can generate code from an abstract syntax tree merely by walking the tree. | | | Using a tree walk which generates code for the subtrees first, then applies the parent operator, the following code can be easily produced: | | | Consider the following abstract syntax tree for the two assignment statements: |
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http://www.cs.wpi.edu/~kal/PLT/PLT11.3.html
(193 words)
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| | CS 352: Project 3, Abstract Syntax Trees |
| | Build Abstract Syntax Trees in a parser for the Tiger language. | | | This programming exercise is more fully described on pages 108-109 of Appel's textbook. | | | There will be a 15% grade penalty per day that the assignment is late. |
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http://www.cs.purdue.edu/homes/ayg/CS352_97/Proj/project3.html
(72 words)
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