MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Service Manual download pdf (Page 43)

Compiler Directives

2-23

LoopTrailer(block, Startidx, Niterations, Nrolled, …). This function is called once for

each section that will roll after the body of the

%roll statement.

RollTrailer(block, …). This function is called once at the end of the %roll

statement if any of the ranges caused loop rolling.

These functions should output any language-specific declarations, loop code,

and so on as required to generate correct code for the loop. An example of a

Roller.tlc file is:

%implements Roller "C"

%function RollHeader(block) Output

{

int i;

%return ("i")

%endfunction

%function LoopHeader(block,StartIdx,Niterations,Nrolled) Output

for (i = %<StartIdx>; i < %<Niterations+StartIdx>; i++)

{

%endfunction

%function LoopTrailer(block,StartIdx,Niterations,Nrolled) Output

}

%endfunction

%function RollTrailer(block) Output

}

%endfunction

Note: The Target Language Compiler function library provided with RTW

has the capability to extract references to the Block I/O and other

RTW-specific vectors that vastly simplify the body of the

%roll statement.

These functions include

LibBlockInputSignal, LibBlockOutputSignal,

LibBlockParameter, LibBlockRWork, LibBlockIWork, LibBlockPWork, and

LibDeclareRollVars. For more details on these functions and other Simulink

functions, see the section on Loop Rolling beginning on page 3-44 along with

the “Target Language Compiler Function Library Reference” chapter. This

library also includes a default implementation of Roller.tlc.

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Service Manual Page 43