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use llvm_sys::{
analysis::{LLVMVerifierFailureAction, LLVMVerifyFunction},
core::{
LLVMCountBasicBlocks, LLVMCountParams, LLVMDumpValue, LLVMGetParam, LLVMGetReturnType,
LLVMGetValueKind, LLVMGetValueName2, LLVMSetValueName2, LLVMTypeOf,
},
prelude::LLVMValueRef,
LLVMTypeKind, LLVMValueKind,
};
use std::ffi::CStr;
use std::marker::PhantomData;
use std::ops::Deref;
use super::Type;
/// Wrapper for a LLVM Value Reference.
#[derive(Copy, Clone)]
#[repr(transparent)]
pub struct Value<'llvm>(LLVMValueRef, PhantomData<&'llvm ()>);
impl<'llvm> Value<'llvm> {
/// Create a new Value instance.
///
/// # Panics
///
/// Panics if `value_ref` is a null pointer.
pub(super) fn new(value_ref: LLVMValueRef) -> Self {
assert!(!value_ref.is_null());
Value(value_ref, PhantomData)
}
/// Get the raw LLVM value reference.
#[inline]
pub(super) fn value_ref(&self) -> LLVMValueRef {
self.0
}
/// Get the LLVM value kind for the given value reference.
pub(super) 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> {
/// Create a new FnValue instance.
///
/// # Panics
///
/// Panics if `value_ref` is a null pointer.
pub(super) 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
}
}
}
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