Running annotation module

[atamlir]

Hi,

am trying to run annotation module code from the link in the tutorial
http://bholt.org/posts/llvm-quick-tricks.html

`
#include "llvm/Pass.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/IR/Module.h"
#include

using namespace llvm;

namespace {
struct SkeletonPass : public ModulePass {
static char ID;
SkeletonPass() : ModulePass(ID) {}

virtual bool runOnModule(Module &M) override;

};
}

char SkeletonPass::ID = 0;
std::set<Function*> async_fns;

 bool SkeletonPass::runOnModule(Module &M) {
  // Get the function to call from our runtime library.
  auto global_annos = M.getNamedGlobal("llvm.global.annotations");
  if (global_annos) {
    auto a = cast<ConstantArray>(global_annos->getOperand(0));
    for (int i=0; i<a->getNumOperands(); i++) {
      auto e = cast<ConstantStruct>(a->getOperand(i));

      if (auto fn = dyn_cast<Function>(e->getOperand(0)->getOperand(0))) {
        auto anno = cast<ConstantDataArray>(cast<GlobalVariable>(e->getOperand(1)->getOperand(0))->getOperand(0))->getAsCString();
      if (anno == "async") { async_fns.insert(fn); }          }
    }
  }

}

// Automatically enable the pass.
// http://adriansampson.net/blog/clangpass.html

static void registerSkeletonPass(const PassManagerBuilder &,
legacy::PassManagerBase &PM) {
PM.add(new SkeletonPass());
}
static RegisterStandardPasses
MyPassRegistration(PassManagerBuilder::EP_EarlyAsPossible,
registerSkeletonPass);

static RegisterStandardPasses
RegisterMyPass0(PassManagerBuilder::EP_EnabledOnOptLevel0, registerSkeletonPass);`

and something.c
`#include <stdio.h>

attribute((annotate("async"))) int foo() {
printf("foo does nothing\n");
}

int main(int argc, const char** argv) {
int num;
int x = foo();
scanf("%i", &num);
printf("%i\n", x + num + 2);
return 0;
}`

am getting these errors:
0. Program arguments: /usr/local/bin/clang-5.0 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name something.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -coverage-notes-file /home/atamli/StaticAnalysis/llvm-pass-skeleton/build/example/something.gcno -resource-dir /usr/local/lib/clang/5.0.0 -internal-isystem /usr/local/include -internal-isystem /usr/local/lib/clang/5.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir /home/atamli/StaticAnalysis/llvm-pass-skeleton/build/example -ferror-limit 19 -fmessage-length 111 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -load ../skeleton/libSkeletonPass.so -o something.o -x c something.c

1. parser at end of file
2. Per-function optimization
3. Running pass 'Unnamed pass: implement Pass::getPassName()' on function '@foo'
   clang-5.0: error: unable to execute command: Segmentation fault (core dumped)
   clang-5.0: error: clang frontend command failed due to signal (use -v to see invocation)
   clang version 5.0.0 (trunk 305458)
   Target: x86_64-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /usr/local/bin
   clang-5.0: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script.
   clang-5.0: note: diagnostic msg:

Any idea how to fix this ?

[sampsyo]

Hi! Can you please format your post so that the code and terminal output is legible (i.e., use ```)?

If you're getting a segmentation fault, you'll want to load your program up in a debugger (gdb or lldb) to find out where the crash is happening and to get a traceback. I unfortunately can't make any useful guesses just by looking at code on the screen. 😃