hello.clang.bc

; ModuleID = 'hello.cpp'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"

@.str = private unnamed_addr constant [7 x i8] c"global\00", section "llvm.metadata"
@.str1 = private unnamed_addr constant [10 x i8] c"hello.cpp\00", section "llvm.metadata"

define i32 @main(i32 %argc, i8** %argv) nounwind uwtable ssp {
entry:
  %retval = alloca i32, align 4
  %argc.addr = alloca i32, align 4
  %argv.addr = alloca i8**, align 8
  %foo = alloca i32, align 4
  %bar = alloca i32*, align 8
  %baz = alloca i32, align 4
  store i32 0, i32* %retval
  store i32 %argc, i32* %argc.addr, align 4
  store i8** %argv, i8*** %argv.addr, align 8
  %foo1 = bitcast i32* %foo to i8*
  call void @llvm.var.annotation(i8* %foo1, i8* getelementptr inbounds ([7 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([10 x i8]* @.str1, i32 0, i32 0), i32 11)
  %bar2 = bitcast i32** %bar to i8*
  call void @llvm.var.annotation(i8* %bar2, i8* getelementptr inbounds ([7 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([10 x i8]* @.str1, i32 0, i32 0), i32 12)
  %0 = load i32** %bar, align 8
  store i32 1, i32* %0, align 4
  %1 = load i32** %bar, align 8
  %2 = load i32* %1, align 4
  store i32 %2, i32* %baz, align 4
  %3 = load i32** %bar, align 8
  %4 = load i32* %3, align 4
  store i32 %4, i32* %foo, align 4
  ret i32 0
}

declare void @llvm.var.annotation(i8*, i8*, i8*, i32) nounwind

hello.cpp

#include <stdio.h>

struct Point {
  int x;
  int y;
};

#define global __attribute((annotate("global")))

int main(int argc, char * argv[]) {
  int foo __attribute__((annotate("global")));
  int global * bar;

  *bar = 1;

  int baz = *bar;

  foo = *bar;

  return 0;
}