you would need to build with debug info (-g) or similar (there are a few
other options that enable the same source location info) to produce the
debuglocs that will tell you about that
On Mon, Jul 11, 2016 at 9:40 PM, Shail Dave via cfe-users <
cfe-users@lists.llvm.org> wrote:
> Hi,
>
> I am working with LLVM 3.4 and want to obtain the line number information
> of source file from IR. The IR is generated from simple c code with Clang. *I
> want to obtain the line number in source c file from the line in IR body.*
>
> I tried this -
>
> 1. For Instruction BI, unsigned Line = Line =
> BI->getDebugLoc().getLine();
> 2. For Loop L, std::cout << L->getStartLoc().getLine();
>
> But, the result stored/printed is always 0. I don't know how to obtain
> line number in the source from LLVM IR.
>
> My Source C file is -
> #include <stdio.h>
>
> int main(){
>
> int i;
>
> int inbuf[100];
> int outbuf[100];
>
> for(i = 0; i < 100; ++i)
> inbuf[i] ^= outbuf[i];
>
> inbuf[1] += 402;
> inbuf[6] += 107;
> inbuf[97] += 231;
>
> for(i = 0; i < 100; ++i)
> {
> inbuf[i] += outbuf[i];
> }
>
> inbuf[47] += 312;
>
> //print-statements
> for (i=0;i<100;i++) {
> printf("inbuf[%d] = %d\n",i,inbuf[i]); }return 0;
> }
>
>
> *Command Used-* ~/llvm/build/Release+Asserts/bin/clang -O3
> -fno-unroll-loops -fno-vectorize -fno-slp-vectorize -S -emit-llvm sample.c
> -o sample.ll
>
> I have working pass which can detect and analyze the loops and
> instructions. I am using it inside function - runOnLoop(Loop *L,
> LPPassManager &LPM)
>
> I have also tried with -O0 and -fstandalone-debug option in the compile
> line. But, it is still printing 0.
>
> The following is also not working out.
>
> if (MDNode *N = I->getMetadata("dbg")) { // Here I is an LLVM instruction
> DILocation Loc(N); // DILocation is in DebugInfo.h
> unsigned Line = Loc.getLineNumber();
> }
>
> It would be great if anybody can kindly help me for the same. Thanks!
>
> Best,
> Shail
> ᐧ
>
> _______________________________________________
> cfe-users mailing list
> cfe-users@lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
>
>
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