-//! Safe wrapper around the LLVM C API.
-//!
-//! References returned from the LLVM API are tied to the `'llvm` lifetime which is bound to the
-//! context where the objects are created in.
-//! We do not offer wrappers to remove or delete any objects in the context and therefore all the
-//! references will be valid for the liftime of the context.
-
-use llvm_sys::analysis::{LLVMVerifierFailureAction, LLVMVerifyFunction};
-use llvm_sys::core::{
-    LLVMAddFunction, LLVMAppendBasicBlockInContext, LLVMBuildFAdd, LLVMBuildFCmp, LLVMBuildFMul,
-    LLVMBuildFSub, LLVMBuildRet, LLVMBuildUIToFP, LLVMConstReal, LLVMContextCreate,
-    LLVMContextDispose, LLVMCountBasicBlocks, LLVMCountParams, LLVMCreateBuilderInContext,
-    LLVMDisposeBuilder, LLVMDisposeModule, LLVMDoubleTypeInContext, LLVMDumpModule, LLVMDumpType,
-    LLVMDumpValue, LLVMGetNamedFunction, LLVMGetParam, LLVMGetReturnType, LLVMGetTypeKind,
-    LLVMGetValueKind, LLVMGetValueName2, LLVMModuleCreateWithNameInContext,
-    LLVMPositionBuilderAtEnd, LLVMSetValueName2, LLVMTypeOf,
-};
-use llvm_sys::prelude::{
-    LLVMBasicBlockRef, LLVMBool, LLVMBuilderRef, LLVMContextRef, LLVMModuleRef, LLVMTypeRef,
-    LLVMValueRef,
-};
-use llvm_sys::{LLVMRealPredicate, LLVMTypeKind, LLVMValueKind};
-
-use std::convert::TryFrom;
-use std::ffi::CStr;
-use std::marker::PhantomData;
-use std::ops::Deref;
-
-use crate::SmallCStr;
-
-// Definition of LLVM C API functions using our `repr(transparent)` types.
-extern "C" {
-    fn LLVMFunctionType(
-        ReturnType: Type<'_>,
-        ParamTypes: *mut Type<'_>,
-        ParamCount: ::libc::c_uint,
-        IsVarArg: LLVMBool,
-    ) -> LLVMTypeRef;
-    fn LLVMBuildCall2(
-        arg1: LLVMBuilderRef,
-        arg2: Type<'_>,
-        Fn: FnValue<'_>,
-        Args: *mut Value<'_>,
-        NumArgs: ::libc::c_uint,
-        Name: *const ::libc::c_char,
-    ) -> LLVMValueRef;
-}
-
-// ====================
-//   Module / Context
-// ====================
-
-/// Wrapper for a LLVM Module with its own LLVM Context.
-pub struct Module {
-    ctx: LLVMContextRef,
-    module: LLVMModuleRef,
-}
-
-impl<'llvm> Module {
-    /// Create a new Module instance.
-    ///
-    /// # Panics
-    ///
-    /// Panics if creating the context or the module fails.
-    pub fn new() -> Self {
-        let (ctx, module) = unsafe {
-            let c = LLVMContextCreate();
-            let m = LLVMModuleCreateWithNameInContext(b"module\0".as_ptr().cast(), c);
-            assert!(!c.is_null() && !m.is_null());
-            (c, m)
-        };
-
-        Module { ctx, module }
-    }
-
-    /// Dump LLVM IR emitted into the Module to stdout.
-    pub fn dump(&self) {
-        unsafe { LLVMDumpModule(self.module) };
-    }
-
-    /// Get a type reference representing a `f64` float.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn type_f64(&self) -> Type<'llvm> {
-        let type_ref = unsafe { LLVMDoubleTypeInContext(self.ctx) };
-        Type::new(type_ref)
-    }
-
-    /// Get a type reference representing a `fn(args) -> ret` function.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn type_fn(&'llvm self, args: &mut [Type<'llvm>], ret: Type<'llvm>) -> Type<'llvm> {
-        let type_ref = unsafe {
-            LLVMFunctionType(
-                ret,
-                args.as_mut_ptr(),
-                args.len() as libc::c_uint,
-                0, /* IsVarArg */
-            )
-        };
-        Type::new(type_ref)
-    }
-
-    /// Add a function with the given `name` and `fn_type` to the module and return a value
-    /// reference representing the function.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer or `name` could not be converted to a
-    /// [`SmallCStr`].
-    pub fn add_fn(&'llvm self, name: &str, fn_type: Type<'llvm>) -> FnValue<'llvm> {
-        debug_assert_eq!(
-            fn_type.kind(),
-            LLVMTypeKind::LLVMFunctionTypeKind,
-            "Expected a function type when adding a function!"
-        );
-
-        let name = SmallCStr::try_from(name)
-            .expect("Failed to convert 'name' argument to small C string!");
-
-        let value_ref = unsafe { LLVMAddFunction(self.module, name.as_ptr(), fn_type.0) };
-        FnValue::new(value_ref)
-    }
-
-    /// Get a function value reference to the function with the given `name` if it was previously
-    /// added to the module with [`add_fn`][Module::add_fn].
-    ///
-    /// # Panics
-    ///
-    /// Panics if `name` could not be converted to a [`SmallCStr`].
-    pub fn get_fn(&'llvm self, name: &str) -> Option<FnValue<'llvm>> {
-        let name = SmallCStr::try_from(name)
-            .expect("Failed to convert 'name' argument to small C string!");
-
-        let value_ref = unsafe { LLVMGetNamedFunction(self.module, name.as_ptr()) };
-
-        (!value_ref.is_null()).then(|| FnValue::new(value_ref))
-    }
-
-    /// Append a Basic Block to the end of the function referenced by the value reference
-    /// `fn_value`.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn append_basic_block(&'llvm self, fn_value: FnValue<'llvm>) -> BasicBlock<'llvm> {
-        let block = unsafe {
-            LLVMAppendBasicBlockInContext(
-                self.ctx,
-                fn_value.value_ref(),
-                b"block\0".as_ptr().cast(),
-            )
-        };
-        assert!(!block.is_null());
-
-        BasicBlock(block, PhantomData)
-    }
-}
-
-impl Drop for Module {
-    fn drop(&mut self) {
-        unsafe {
-            LLVMDisposeModule(self.module);
-            LLVMContextDispose(self.ctx);
-        }
-    }
-}
-
-// ===========
-//   Builder
-// ===========
-
-/// Wrapper for a LLVM IR Builder.
-pub struct Builder<'llvm> {
-    builder: LLVMBuilderRef,
-    _ctx: PhantomData<&'llvm ()>,
-}
-
-impl<'llvm> Builder<'llvm> {
-    /// Create a new LLVM IR Builder with the `module`s context.
-    ///
-    /// # Panics
-    ///
-    /// Panics if creating the IR Builder fails.
-    pub fn with_ctx(module: &'llvm Module) -> Builder<'llvm> {
-        let builder = unsafe { LLVMCreateBuilderInContext(module.ctx) };
-        assert!(!builder.is_null());
-
-        Builder {
-            builder,
-            _ctx: PhantomData,
-        }
-    }
-
-    /// Position the IR Builder at the end of the given Basic Block.
-    pub fn pos_at_end(&self, bb: BasicBlock<'llvm>) {
-        unsafe {
-            LLVMPositionBuilderAtEnd(self.builder, bb.0);
-        }
-    }
-
-    /// Emit a [fadd](https://llvm.org/docs/LangRef.html#fadd-instruction) instruction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn fadd(&self, lhs: Value<'llvm>, rhs: Value<'llvm>) -> Value<'llvm> {
-        debug_assert!(lhs.is_f64(), "fadd: Expected f64 as lhs operand!");
-        debug_assert!(rhs.is_f64(), "fadd: Expected f64 as rhs operand!");
-
-        let value_ref = unsafe {
-            LLVMBuildFAdd(
-                self.builder,
-                lhs.value_ref(),
-                rhs.value_ref(),
-                b"fadd\0".as_ptr().cast(),
-            )
-        };
-        Value::new(value_ref)
-    }
-
-    /// Emit a [fsub](https://llvm.org/docs/LangRef.html#fsub-instruction) instruction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn fsub(&self, lhs: Value<'llvm>, rhs: Value<'llvm>) -> Value<'llvm> {
-        debug_assert!(lhs.is_f64(), "fsub: Expected f64 as lhs operand!");
-        debug_assert!(rhs.is_f64(), "fsub: Expected f64 as rhs operand!");
-
-        let value_ref = unsafe {
-            LLVMBuildFSub(
-                self.builder,
-                lhs.value_ref(),
-                rhs.value_ref(),
-                b"fsub\0".as_ptr().cast(),
-            )
-        };
-        Value::new(value_ref)
-    }
-
-    /// Emit a [fmul](https://llvm.org/docs/LangRef.html#fmul-instruction) instruction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn fmul(&self, lhs: Value<'llvm>, rhs: Value<'llvm>) -> Value<'llvm> {
-        debug_assert!(lhs.is_f64(), "fmul: Expected f64 as lhs operand!");
-        debug_assert!(rhs.is_f64(), "fmul: Expected f64 as rhs operand!");
-
-        let value_ref = unsafe {
-            LLVMBuildFMul(
-                self.builder,
-                lhs.value_ref(),
-                rhs.value_ref(),
-                b"fmul\0".as_ptr().cast(),
-            )
-        };
-        Value::new(value_ref)
-    }
-
-    /// Emit a [fcmult](https://llvm.org/docs/LangRef.html#fcmp-instruction) instruction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn fcmpult(&self, lhs: Value<'llvm>, rhs: Value<'llvm>) -> Value<'llvm> {
-        debug_assert!(lhs.is_f64(), "fcmplt: Expected f64 as lhs operand!");
-        debug_assert!(rhs.is_f64(), "fcmplt: Expected f64 as rhs operand!");
-
-        let value_ref = unsafe {
-            LLVMBuildFCmp(
-                self.builder,
-                LLVMRealPredicate::LLVMRealULT,
-                lhs.value_ref(),
-                rhs.value_ref(),
-                b"fcmplt\0".as_ptr().cast(),
-            )
-        };
-        Value::new(value_ref)
-    }
-
-    /// Emit a [uitofp](https://llvm.org/docs/LangRef.html#uitofp-to-instruction) instruction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn uitofp(&self, val: Value<'llvm>, dest_type: Type<'llvm>) -> Value<'llvm> {
-        debug_assert!(val.is_int(), "uitofp: Expected integer operand!");
-
-        let value_ref = unsafe {
-            LLVMBuildUIToFP(
-                self.builder,
-                val.value_ref(),
-                dest_type.0,
-                b"uitofp\0".as_ptr().cast(),
-            )
-        };
-        Value::new(value_ref)
-    }
-
-    /// Emit a [call](https://llvm.org/docs/LangRef.html#call-instruction) instruction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn call(&self, fn_value: FnValue<'llvm>, args: &mut [Value<'llvm>]) -> Value<'llvm> {
-        let value_ref = unsafe {
-            LLVMBuildCall2(
-                self.builder,
-                fn_value.ret_type(),
-                fn_value,
-                args.as_mut_ptr(),
-                args.len() as libc::c_uint,
-                b"call\0".as_ptr().cast(),
-            )
-        };
-        Value::new(value_ref)
-    }
-
-    /// Emit a [ret](https://llvm.org/docs/LangRef.html#ret-instruction) instruction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn ret(&self, ret: Value<'llvm>) {
-        let ret = unsafe { LLVMBuildRet(self.builder, ret.value_ref()) };
-        assert!(!ret.is_null());
-    }
-}
-
-impl Drop for Builder<'_> {
-    fn drop(&mut self) {
-        unsafe { LLVMDisposeBuilder(self.builder) }
-    }
-}
-
-// ==============
-//   BasicBlock
-// ==============
-
-/// Wrapper for a LLVM Basic Block.
-#[derive(Copy, Clone)]
-pub struct BasicBlock<'llvm>(LLVMBasicBlockRef, PhantomData<&'llvm ()>);
-
-// ========
-//   Type
-// ========
-
-/// Wrapper for a LLVM Type Reference.
-#[derive(Copy, Clone)]
-#[repr(transparent)]
-pub struct Type<'llvm>(LLVMTypeRef, PhantomData<&'llvm ()>);
-
-impl<'llvm> Type<'llvm> {
-    fn new(type_ref: LLVMTypeRef) -> Self {
-        assert!(!type_ref.is_null());
-        Type(type_ref, PhantomData)
-    }
-
-    fn kind(&self) -> LLVMTypeKind {
-        unsafe { LLVMGetTypeKind(self.0) }
-    }
-
-    /// Dump the LLVM Type to stdout.
-    pub fn dump(&self) {
-        unsafe { LLVMDumpType(self.0) };
-    }
-
-    /// Get a value reference representing the const `f64` value.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn const_f64(self, n: f64) -> Value<'llvm> {
-        debug_assert_eq!(
-            self.kind(),
-            LLVMTypeKind::LLVMDoubleTypeKind,
-            "Expected a double type when creating const f64 value!"
-        );
-
-        let value_ref = unsafe { LLVMConstReal(self.0, n) };
-        Value::new(value_ref)
-    }
-}
-
-// =========
-//   Value
-// =========
-
-/// Wrapper for a LLVM Value Reference.
-#[derive(Copy, Clone)]
-#[repr(transparent)]
-pub struct Value<'llvm>(LLVMValueRef, PhantomData<&'llvm ()>);
-
-impl<'llvm> Value<'llvm> {
-    fn new(value_ref: LLVMValueRef) -> Self {
-        assert!(!value_ref.is_null());
-        Value(value_ref, PhantomData)
-    }
-
-    #[inline]
-    fn value_ref(&self) -> LLVMValueRef {
-        self.0
-    }
-
-    fn kind(&self) -> LLVMValueKind {
-        unsafe { LLVMGetValueKind(self.value_ref()) }
-    }
-
-    /// Dump the LLVM Value to stdout.
-    pub fn dump(&self) {
-        unsafe { LLVMDumpValue(self.value_ref()) };
-    }
-
-    /// Get a type reference representing for the given value reference.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn type_of(&self) -> Type<'llvm> {
-        let type_ref = unsafe { LLVMTypeOf(self.value_ref()) };
-        Type::new(type_ref)
-    }
-
-    /// Set the name for the given value reference.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn set_name(&self, name: &str) {
-        unsafe { LLVMSetValueName2(self.value_ref(), name.as_ptr().cast(), name.len()) };
-    }
-
-    /// Get the name for the given value reference.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn get_name(&self) -> &'llvm str {
-        let name = unsafe {
-            let mut len: libc::size_t = 0;
-            let name = LLVMGetValueName2(self.0, &mut len as _);
-            assert!(!name.is_null());
-
-            CStr::from_ptr(name)
-        };
-
-        // TODO: Does this string live for the time of the LLVM context?!
-        name.to_str()
-            .expect("Expected valid UTF8 string from LLVM API")
-    }
-
-    /// Check if value is of `f64` type.
-    pub fn is_f64(&self) -> bool {
-        self.type_of().kind() == LLVMTypeKind::LLVMDoubleTypeKind
-    }
-
-    /// Check if value is of integer type.
-    pub fn is_int(&self) -> bool {
-        self.type_of().kind() == LLVMTypeKind::LLVMIntegerTypeKind
-    }
-}
-
-/// Wrapper for a LLVM Value Reference specialized for contexts where function values are needed.
-#[derive(Copy, Clone)]
-#[repr(transparent)]
-pub struct FnValue<'llvm>(Value<'llvm>);
-
-impl<'llvm> Deref for FnValue<'llvm> {
-    type Target = Value<'llvm>;
-    fn deref(&self) -> &Self::Target {
-        &self.0
-    }
-}
-
-impl<'llvm> FnValue<'llvm> {
-    fn new(value_ref: LLVMValueRef) -> Self {
-        let value = Value::new(value_ref);
-        debug_assert_eq!(
-            value.kind(),
-            LLVMValueKind::LLVMFunctionValueKind,
-            "Expected a fn value when constructing FnValue!"
-        );
-
-        FnValue(value)
-    }
-
-    /// Get a type reference representing the return value of the given function value.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer.
-    pub fn ret_type(&self) -> Type<'llvm> {
-        let type_ref = unsafe { LLVMGetReturnType(LLVMTypeOf(self.value_ref())) };
-        Type::new(type_ref)
-    }
-
-    /// Get the number of function arguments for the given function value.
-    pub fn args(&self) -> usize {
-        unsafe { LLVMCountParams(self.value_ref()) as usize }
-    }
-
-    /// Get a value reference for the function argument at index `idx`.
-    ///
-    /// # Panics
-    ///
-    /// Panics if LLVM API returns a `null` pointer or indexed out of bounds.
-    pub fn arg(&self, idx: usize) -> Value<'llvm> {
-        assert!(idx < self.args());
-
-        let value_ref = unsafe { LLVMGetParam(self.value_ref(), idx as libc::c_uint) };
-        Value::new(value_ref)
-    }
-
-    /// Get the number of Basic Blocks for the given function value.
-    pub fn basic_blocks(&self) -> usize {
-        unsafe { LLVMCountBasicBlocks(self.value_ref()) as usize }
-    }
-
-    /// Verify that the given function is valid.
-    pub fn verify(&self) -> bool {
-        unsafe {
-            LLVMVerifyFunction(
-                self.value_ref(),
-                LLVMVerifierFailureAction::LLVMPrintMessageAction,
-            ) == 0
-        }
-    }
-}
-

-