The Esterel v5 21 System Manual - Courses

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12 CHAPTER 2. USING THE ESTEREL COMPILER submodule calls. If all submodules are provided, one obtains a fully linked ic module that contains no submodule calls. Fully linked ic code is also called lc code for compatibility with previous versions. The iclc processor also performs type-checking of submodule calls. The ic format can conveniently replaces source code in libraries. It can also be used when source code communication is undesirable. It is always equivalent to input the file foo.strl or the file foo.ic into the esterel command. sc A file foo.sc contains unsorted circuit code obtained by the compiling process described in [1]. The circuit code contains the same tables as the ic code, but the kernel statements are replaced by the equations of a Boolean circuit. The circuit may be combinationally cyclic, and the equations are written in no particular order. The lcsc processor transforms fully linked lc files into sc files. It is the heart of the compiler. ssc A file foo.ssc contains sorted circuit code. The sorted circuit code contains the same tables as the ic and sc code, but the equations are sorted and printed in topological order: any Boolean variable that appears on the right-hand-side of an equation is previously defined by another equation. The scssc processor transforms sc files into ssc files. It accepts only acyclic sc circuit code. The much more elaborate sccausal processor performs a full constructiveness (or causality) analysis of the sc code and generates a ssc code if the program is constructive [2, 1]. The analysis can be expensive if the program is cyclic. oc A file foo.oc contains automaton code, common to the Lustre and Esterel compilers. The automaton code contains the same tables as the ic code, but the kernel statements are replaced by an automaton table. The ssccoc processor transforms ssc files into oc files. The lcoc processor inherited from the former Esterel v3 compiler directly transforms fully linked ic code into oc code. Unlike unsorted or sorted circuit codes, automaton code can be generated only for comparatively small programs. When it can be generated, automaton code is very efficient. c A file foo.c contains executable C code or ANSI C code. Such code can be generated in three different ways: from sc code, using
2.2. USAGE OF THE ESTEREL COMMAND 13 the scc processor; from ssc code, using the sscc processor; from oc code, using the occ processor. These three processors share the same executable, which is actually occ. The scc and sscc commands are simply shell scripts that call occ with different options. debug A file foo.debug contains a human-readable form of the ssc or oc codes, respectively generated by the sscdebug and ocdebug processors (sscdebug is a shell script that calls ocdebug with an appropriate option). blif A file foo.blif contains synchronous circuit descriptions written in the blif format (Berkeley Logical Interchange Format). Such a file is generated from an ssc file by the sscblif processor. For Pure Esterel programs, i.e. programs that handle no data (only pure signals and counters), the circuit is behaviorally equivalent to the source Esterel program and it can be directly implemented in hardware, preferably after combinational and sequential optimizations described in other documents. For general Esterel programs, the sscblif processor must be used with option -soft, using the command esterel -Lblif:-soft foo.strl The compiler then extracts the control part of the source program and prints it as a synchronous blif circuit. This circuit can be optimized using techniques and tools described in separate documents [5, 6] and the optimized version can be used to rebuild an optimized ssc code using a processor called blifssc not presented here. 2.2 Usage of the esterel Command Since the general esterel command has numerous options, we have developed an experimental xesterel graphical user interface to help building an esterel command line. The options can either be written by hand, for example in a Makefile, or be generated by xesterel. The esterel command receives as arguments a list of options and a list of files to be compiled. Options and files can appear in any order. The files can be either source Esterel files (suffix .strl) or intermediate code files (suffixes .ic, .lc, .sc, .ssc, and .oc).
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Page 4 and 5: ii CONTENTS 2.5 Sanity Checks . . .
Page 6 and 7: iv CONTENTS 6.6.1 Showing the State
Page 8 and 9: 2 PREFACE feedback. WARNING: Chapte
Page 10 and 11: 4 CHAPTER 1. GETTING STARTED and XE
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Page 16 and 17: 10 CHAPTER 1. GETTING STARTED
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62 CHAPTER 5. THE XES GRAPHICAL SIM
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86 CHAPTER 6. SIMULATION WITH CSIMU
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100 CHAPTER 7. SIMULATION EXAMPLES
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112 CHAPTER 8. CONSTRUCTIVE CYCLIC
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Index !, see csimul ?, see csimul #
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124 INDEX ?, 85 combined signal, 88
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126 INDEX lc, 12, 13, 27 -lc, 15, 2
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128 INDEX scc, 13, 18 sccausal, 12,
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130 INDEX high/low inputs, 67, 72 i
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