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
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