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Symbol Table

Fig. 3.4. Internal representation of the statement a = b + c.

4 Detailed Description of Basic Modules

Scheme of high level functions calls of the main module dvm.cpp is:

m ain initialize

initVariantNames

initLibNames

initDVM

TranslateFileDVM • TransFunc

unparse (class File) InsertDebugStat

main(int argc, char *argv[])

The function processes the compilation parameters and sets compilation mode on. It initializes compiler data structures, calls the TranslateFileDVM( ) function to restructure parse tree according to the compilation mode, and calls the unparse( ) class SgFile member function for generating new source code from restructured internal form. The function returns 1 if there are found some errors in the program.

If the compilation mode is generating of parallel program then the TransFunc( ) function is called for each procedure of program else the InsertDebugStat( ) function is called.

The statements of procedure are scanned in lexical order until last statement of procedure.

Specification statements and directives processing.

A DISTRIBUTE directive is involved in list. The function builds the aligning trees processing ALIGN directives. After specification directives scanning

When all specification statements and directives are scanned the LibDVM function calls for creating distributed arrays are generated and inserted in program before first executable statement. The GenDistArray( ) function creates distributed arrays (LibDVM object) for array with DISTRIBUTE attribute and all arrays immediately or ultimately aligned with it.

Executable statements and directives processing.

The distributed array element references in assignment, CALL , arithmetical IF, logical IF, IF-THEN, ELSE_IF, and computed GOTO statements are linearizing.

A DVM directive is replaced by sequence of LibDVM functions calls. When new statement is inserted in a program restructuring of the control graph (carring or substituting label, replacement of logical IF statement by IF...THEN...ENDIF construct, and so on) is performed if necessary. The ReplaceContext( ), doAssignStmtAfter( ), InsertNewStatementAfter( ), InserNewStatementBefore( ) functions serve for inserting new statement in parse tree and restructuring it.

After processing last statement of procedure the declaration statements for temporary variables that are used for argument passing, storing function value, buffering I/O, and addressing distributed arrays are created and inserted in specification part of procedure (DeclareVarDVM( )).

List of called functions:

The function generates the sequential code including Debugger and Performance Analyzer functions calls. Parameters of compilation(-e… and -d…) control the process of generating new statements.

The statements of procedure are scanned in lexical order until last statement of procedure. The specification statements and directives are omitted.

If the user specify non-zero level of debugging in compiler run command the statements containing expressions (assignment, CALL , arithmetical IF and so on) are surrounded with Debugger functions for control of variables value.

The function inserts Debugger calls at the beginning and the end of each parallel and sequential loop and Performance Analyzer calls at the beginning and the end of each interval.

List of called functions:

This function initializes the variables of compiler used in the mode of generating Debugger and Performance Analyzer calls.

This function initializes the table of variant tags.

This function initializes the LibDVM function name table.

This function inserts the LibDVM function symbols in the Symbol Table.

This function cleans the mask of using LibDVM functions. The functions generating LibDVM library calls reset the corresponding mask element to 1. The declaration statement is created only for masked (used in procedure) LibDVM functions.

The function puts in the Symbol Table the following symbols of reserved variables:

Характеристики

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