The PowerPC 604 RISC Microprocessor - eisber.net

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Syntaxgesteuerte Editoren,Interpreter und CompilerMentor: Arbeiten an diesem Projekt seit1975, Struktureditor, Mental = Editordefinitionssprache,Softwareentwicklungsumgebung,INRIA, FrankreichGandalf (ALOE): A Language Oriented EditorEditorgenerator S-E-Umgebung, CMUCOPS: Cornel Program Synthesizer,Editorgenerator mit Semantikuberprufung(attributierte Grammatik), Interpreter undDebugger fur Syntaxbaum, Cornell Univ.PSG: Programm System Generator,TH Darmstadt
power but retain the disciplined viewpoint of the rest ofthe system.A final example illustrates an awkwardness arisingnot from the structural constraints of the Synthesizer,but from the textual constraints of a language whoseconcrete syntax was defined to be unambiguous forparsers. Inserting the templateIF ( condition)THEN statementintoIF ( condition )THEN 13 tatementELSE PUT LIST ( 'whose else am i?' );leads to an inconsistency between the explicitly derivedstructure (an IF-THEN within an IF-THEN-ELSE)and the structure implied by the parser-oriented concretesyntax (an IF-THEN-ELSE within an IF-THEN). Althoughtempted to adopt the derived interpretation (becauseprettyprinting easily distinguishes one interpretationfrom the other), we elected, instead, to maintaincompatibility with PL/I. Therefore, we prevent such aninsertion and require that the user provide a compoundstatement explicitly.There are many possible alternative designs, amongthem the following four: a) the compound statementcould be inserted automatically when necessary, b) acompound statement could be displayed automaticallywhen necessary; c) the IF-THEN-ELSE template couldbe defined asIF ( condition )THEN DO; (statement) END;ELSE DO; (statement) END;d) the IF-THEN template could be eliminated therebyrequiring that every conditional statement have anELSE-clause. In this final case, the display of an emptyELSE clause could be suppressed unless necessary fordisambiguation.VI. ImplementationA. File TreesSynthesizer files are represented internally as executablederivation trees. Each template or phrase is representedin this tree by a separate node. The pointersconnecting nodes are, in fact, goto instructions for theinterpreter, the null pointer is a halt instruction. Nodesare variable length; each is composed of three sections:Iextension code continuationThe extension identifies the node type and contains anyother information needed to generate the display of thenode but not necessary to execute it_ The code sectioncontains interpretable op-codes for executing the node.The entry point of thẹ node is the first byte of the codesection. The continuation contains a goto linking thisnode to the next op-code to be executed. The target ofthis goto is either the entry point of a sibling node or aninterior op-code of a parent node.For example, the templateIF ( condition )THEN statementELSE statementhas the internal representation given below.ifrom previous op-codeto next op-codeIF halt skip_2 on_false halt skip____1 I halt goto 1This node is tagged in the extension as an IF-node. It contains op-codes that implement the proper control flow andthree halt instructions that represent the unexpanded placeholders. When the template has been expanded toIF ( k > 0 )THEN statementELSE PUT LIST -( list-of-expressions);a link to Polish postfix code for the phrase k > 0 replaces the first halt op-code, and a link to the node for the PUTstatementreplaces the third halt op-code. A halt instruction remains for the other statement placeholder:from previous op-codeto next op-code +IF goto skip___2___ on_ _false halt skip__ goto J gotocondition code for k > 0 1 goto• 1 halt gotoPUT571 Communicationsofthe ACMSeptember 1981Volume 24Number 9
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The PowerPC 604 RISC Microprocessor
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Rename valid I Reg num Result Resul
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updated by speculatively executed m
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PowerPC 604Reservation stationRA (0
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Data addressInstruction address•M
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Threaded Codethreaded = aufgefadelt
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token threaded codeindirect token t
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Kosten auf dem MIPS 83000indirect t
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CTIL'Start / Restart' 14ZIP Funktio
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SystemparameierStackbefehleKarmen a
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KontrollstrukturenBEGIN ... END Sch
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Stack Framelocal stacklocalsparamet
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122 The P-code Machine [Ch.Thus the
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68Pascal Implementation: Compiler a
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72 Pascal Implementation: Compiler
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Tables of Lexical Analysis123456frw
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JVIII ■ 111t14 /1.11111ySIS ai Y
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4Pascal implementation: Compiler an
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8 Pascal Implementation: Compiler a
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12 Pascal implementation: Compiler
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30 Pascal inipletnentatIon: Compile
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if) 1993, 1994, 1995 Sim Microsyste
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0-PrefaceThis document describes ve
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method calls into actual method cal
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auper_el arsThis field is an index
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ATtagbytesCONSTANT_Integer_infoul t
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2.6.1 SourceFileThe "SourceFile" at
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local ..verieble_table_lengthThis f
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1dc2wPush long or double from const
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I 3.4Storing Stack Values into Loca
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anewarrayAllocate new array of refe
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PastoreStore into single float arra
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laddLong integer addfSubSingle floa
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dreminegInegInegdnegDouble float re
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