[LLVMdev] [cfe-dev][Openmp-dev] Clang Plugin to analyze OpenMP AST

Pan, Wei wei.pan at intel.com
Tue Dec 9 16:04:58 PST 2014

02182   SourceRange getSourceRange() const LLVM_READONLY {
02183     return getCapturedStmt()->getSourceRange();
02184   }

Sounds like it is just the range of the statement being captured.


-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Simone Atzeni
Sent: Tuesday, December 09, 2014 1:30 PM
To: llvmdev at cs.uiuc.edu; cfe-dev at cs.uiuc.edu; openmp-dev at dcs-maillist2.engr.illinois.edu
Subject: Re: [LLVMdev] [cfe-dev][Openmp-dev] Clang Plugin to analyze OpenMP AST

Also I noticed that if I dump the statement using “dump(SourceManager)” I got more info, in particular for example given the following program:

#pragma omp parallel for                                                                                                       
  for (int i = 1; i < MAX; i++) {                                                                                              
    x[i] = x[i - 1];                                                                                                           
    a = a + 1;                                                                                                                 

and as result I get:

OMPParallelForDirective 0x6c24258 </path/to/source.c:22:9, col:25>
|-CapturedStmt 0x6c23df0 <line:23:3, line:26:3>

The captured statement starts at line 23 (which is the line where the for-loop starts and line 26 is the closing bracket.
How do I get those information?


> On Dec 9, 2014, at 08:53, Simone Atzeni <simone.at at gmail.com> wrote:
> Hi,
> I am writing a plugin to get information about the OpenMP constructs from the AST.
> I am basically writing a “RecursiveASTVisitor” and I am trying to find the OpenMP statement and get information like filename and line of code.
> When I am visiting recursively each statement I have my own switch on the “StmtClass” and for now I am focusing on “OMPParallelForDirectiveClass”.
> In my understanding, once I find the beginning of the OpenMP statement, its children are all the statement inside the OpenMP construct.
> I was wondering if there is a way to know the lines of code where the OpenMP construct starts and where it finishes (in terms of lines of code), and then get the the same information for their children (lines of code of the other statement in the OpenMP construct).
> In my example, once I find the OMPParallelForDirectiveClass statement I am trying to print line of code using the 3 functions getSpellingLineNumber, getExpansionLineNumber and get PresumedLineNumber using the location start and location end, however the numbers are all equal.
> Also, I am looping into its children and the last statement that I got is that one before the closed bracket of the OpenMP constructs. Can I suppose that "the line of code of the last statement + 1” is the end of the OpenMP construct? What if there are new empty line?
> Hope this is clear and you can give me some advice.
> Thanks.
> Best,
> Simone

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