compiler construction - llvm ir not behaving as expected -


i have following llvm ir , having spent best part of day trying debug cannot seem handle on it. program freezes (with) segfault @ loop when run on windows machine.

; standard declaration etc %gen__list__0 = type { i8*, i64, i64 } %const_array_offset = type { i64, i64 } ; other declaration etc @gbl_constant_59 = common constant [20 x i8] c"aaaaaaaaaaaaaaaaaaaa", align  ; more function declarations etc  define internal %gen__list__0 @gen__fun__elevate12(%const_array_offset*) { entry:   %1 = alloca %gen__list__0   %2 = getelementptr %const_array_offset, %const_array_offset* %0, i32 0, i32 0   %3 = load i64, i64* %2   %4 = getelementptr %const_array_offset, %const_array_offset* %0, i32 0, i32 1   %5 = load i64, i64* %4   %6 = sub i64 %5, %3   %7 = mul i64 %6, i64 2   %8 = getelementptr %gen__list__0, %gen__list__0* %1, i32 0, i32 0   %9 = getelementptr %gen__list__0, %gen__list__0* %1, i32 0, i32 1   %10 = getelementptr %gen__list__0, %gen__list__0* %1, i32 0, i32 2   store i64 %6, i64* %9   store i64 %7, i64* %10   %11 = mul i64 ptrtoint (i8* getelementptr (i8, i8* null, i32 1) i64), %7   %12 = call i8* @malloc(i64 %11)   store i8* %12, i8** %8   %13 = getelementptr %gen__list__0, %gen__list__0* %1, i32 0, i32 0   %14 = load i8*, i8** %13   %15 = getelementptr i8, i8* %14, i64 %6   %16 = getelementptr [20 x i8], [20 x i8]* @gbl_constant_59, i32 0, i64 %3   %17 = alloca i8*   store i8* %16, i8** %17   %18 = alloca i8*   store i8* %14, i8** %18   br label %bb2  bb2:                                              ; preds = %bb3, %entry   %19 = load i8*, i8** %18   %20 = icmp ne i8* %19, %15   br i1 %20, label %bb3, label %bb4  bb3:                                              ; preds = %bb2   %21 = load i8*, i8** %17   %22 = getelementptr i8, i8* %21, i32 1   store i8* %22, i8** %17   %23 = load i8*, i8** %18   %24 = getelementptr i8, i8* %23, i32 1   store i8* %24, i8** %18   br label %bb2  bb4:                                              ; preds = %bb2   %25 = load %gen__list__0, %gen__list__0* %1   ret %gen__list__0 %25 }

all appreciated straighten out/where it/i may going wrong.

the loop implements

c++ style psuedo code sort of loop implements

for(iterator = begin; != end; ++it) {      //code in loop - atm blank }

the problem found putting code through llc. apparently constants marked common linkage can have 0 initializer. have global constant without 0 initializer, in case of @gbl_constant_59 here, need declare constant internal or external.


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