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</pre><pre class="rust"><code><span class="kw">use </span>llvm_sys::{
core::{
LLVMAddFunction, LLVMAppendBasicBlockInContext, LLVMCreateBasicBlockInContext,
LLVMDisposeModule, LLVMDoubleTypeInContext, LLVMDumpModule, LLVMGetNamedFunction,
LLVMModuleCreateWithNameInContext,
},
orc2::{
LLVMOrcCreateNewThreadSafeContext, LLVMOrcCreateNewThreadSafeModule,
LLVMOrcDisposeThreadSafeContext, LLVMOrcThreadSafeContextGetContext,
LLVMOrcThreadSafeContextRef, LLVMOrcThreadSafeModuleRef,
},
prelude::{LLVMBool, LLVMContextRef, LLVMModuleRef, LLVMTypeRef},
LLVMTypeKind,
};
<span class="kw">use </span>std::convert::TryFrom;
<span class="kw">use super</span>::{BasicBlock, FnValue, Type};
<span class="kw">use </span><span class="kw">crate</span>::SmallCStr;
<span class="comment">// Definition of LLVM C API functions using our `repr(transparent)` types.
</span><span class="kw">extern </span><span class="string">"C" </span>{
<span class="kw">fn </span>LLVMFunctionType(
ReturnType: Type<<span class="lifetime">'_</span>>,
ParamTypes: <span class="kw-2">*mut </span>Type<<span class="lifetime">'_</span>>,
ParamCount: ::libc::c_uint,
IsVarArg: LLVMBool,
) -> LLVMTypeRef;
}
<span class="doccomment">/// Wrapper for a LLVM Module with its own LLVM Context.
</span><span class="kw">pub struct </span>Module {
tsctx: LLVMOrcThreadSafeContextRef,
ctx: LLVMContextRef,
module: LLVMModuleRef,
}
<span class="kw">impl</span><<span class="lifetime">'llvm</span>> Module {
<span class="doccomment">/// Create a new Module instance.
///
/// # Panics
///
/// Panics if creating the context or the module fails.
</span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{
<span class="kw">let </span>(tsctx, ctx, module) = <span class="kw">unsafe </span>{
<span class="comment">// We generate a thread safe context because we are going to jit this IR module and
// there is no method to create a thread safe context wrapper from an existing context
// reference (at the time of writing this).
//
// ThreadSafeContext has shared ownership (start with ref count 1).
// We must explicitly dispose our reference (dec ref count).
</span><span class="kw">let </span>tc = LLVMOrcCreateNewThreadSafeContext();
<span class="macro">assert!</span>(!tc.is_null());
<span class="kw">let </span>c = LLVMOrcThreadSafeContextGetContext(tc);
<span class="kw">let </span>m = LLVMModuleCreateWithNameInContext(<span class="string">b"module\0"</span>.as_ptr().cast(), c);
<span class="macro">assert!</span>(!c.is_null() && !m.is_null());
(tc, c, m)
};
Module { tsctx, ctx, module }
}
<span class="doccomment">/// Get the raw LLVM context reference.
</span><span class="attribute">#[inline]
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>ctx(<span class="kw-2">&</span><span class="self">self</span>) -> LLVMContextRef {
<span class="self">self</span>.ctx
}
<span class="doccomment">/// Get the raw LLVM module reference.
</span><span class="attribute">#[inline]
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>module(<span class="kw-2">&</span><span class="self">self</span>) -> LLVMModuleRef {
<span class="self">self</span>.module
}
<span class="doccomment">/// Consume the module and turn in into a raw LLVM ThreadSafeModule reference.
///
/// If ownership of the raw reference is not transferred (eg to the JIT), memory will be leaked
/// in case the reference is disposed explicitly with LLVMOrcDisposeThreadSafeModule.
</span><span class="attribute">#[inline]
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>into_raw_thread_safe_module(<span class="kw-2">mut </span><span class="self">self</span>) -> LLVMOrcThreadSafeModuleRef {
<span class="kw">let </span>m = std::mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.module, std::ptr::null_mut());
<span class="comment">// ThreadSafeModule has unique ownership.
// Takes ownership of module and increments ThreadSafeContext ref count.
//
// We must not reference/dispose `m` after this call, but we need to dispose our `tsctx`
// reference.
</span><span class="kw">let </span>tm = <span class="kw">unsafe </span>{ LLVMOrcCreateNewThreadSafeModule(m, <span class="self">self</span>.tsctx) };
<span class="macro">assert!</span>(!tm.is_null());
tm
}
<span class="doccomment">/// Dump LLVM IR emitted into the Module to stdout.
</span><span class="kw">pub fn </span>dump(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">unsafe </span>{ LLVMDumpModule(<span class="self">self</span>.module) };
}
<span class="doccomment">/// Get a type reference representing a `f64` float.
///
/// # Panics
///
/// Panics if LLVM API returns a `null` pointer.
</span><span class="kw">pub fn </span>type_f64(<span class="kw-2">&</span><span class="self">self</span>) -> Type<<span class="lifetime">'llvm</span>> {
<span class="kw">let </span>type_ref = <span class="kw">unsafe </span>{ LLVMDoubleTypeInContext(<span class="self">self</span>.ctx) };
Type::new(type_ref)
}
<span class="doccomment">/// Get a type reference representing a `fn(args) -> ret` function.
///
/// # Panics
///
/// Panics if LLVM API returns a `null` pointer.
</span><span class="kw">pub fn </span>type_fn(<span class="kw-2">&</span><span class="lifetime">'llvm </span><span class="self">self</span>, args: <span class="kw-2">&mut </span>[Type<<span class="lifetime">'llvm</span>>], ret: Type<<span class="lifetime">'llvm</span>>) -> Type<<span class="lifetime">'llvm</span>> {
<span class="kw">let </span>type_ref = <span class="kw">unsafe </span>{
LLVMFunctionType(
ret,
args.as_mut_ptr(),
args.len() <span class="kw">as </span>libc::c_uint,
<span class="number">0</span>, <span class="comment">/* IsVarArg */
</span>)
};
Type::new(type_ref)
}
<span class="doccomment">/// 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`].
</span><span class="kw">pub fn </span>add_fn(<span class="kw-2">&</span><span class="lifetime">'llvm </span><span class="self">self</span>, name: <span class="kw-2">&</span>str, fn_type: Type<<span class="lifetime">'llvm</span>>) -> FnValue<<span class="lifetime">'llvm</span>> {
<span class="macro">debug_assert_eq!</span>(
fn_type.kind(),
LLVMTypeKind::LLVMFunctionTypeKind,
<span class="string">"Expected a function type when adding a function!"
</span>);
<span class="kw">let </span>name = SmallCStr::try_from(name)
.expect(<span class="string">"Failed to convert 'name' argument to small C string!"</span>);
<span class="kw">let </span>value_ref = <span class="kw">unsafe </span>{ LLVMAddFunction(<span class="self">self</span>.module, name.as_ptr(), fn_type.type_ref()) };
FnValue::new(value_ref)
}
<span class="doccomment">/// 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`].
</span><span class="kw">pub fn </span>get_fn(<span class="kw-2">&</span><span class="lifetime">'llvm </span><span class="self">self</span>, name: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><FnValue<<span class="lifetime">'llvm</span>>> {
<span class="kw">let </span>name = SmallCStr::try_from(name)
.expect(<span class="string">"Failed to convert 'name' argument to small C string!"</span>);
<span class="kw">let </span>value_ref = <span class="kw">unsafe </span>{ LLVMGetNamedFunction(<span class="self">self</span>.module, name.as_ptr()) };
(!value_ref.is_null()).then(|| FnValue::new(value_ref))
}
<span class="doccomment">/// 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.
</span><span class="kw">pub fn </span>append_basic_block(<span class="kw-2">&</span><span class="lifetime">'llvm </span><span class="self">self</span>, fn_value: FnValue<<span class="lifetime">'llvm</span>>) -> BasicBlock<<span class="lifetime">'llvm</span>> {
<span class="kw">let </span>block = <span class="kw">unsafe </span>{
LLVMAppendBasicBlockInContext(
<span class="self">self</span>.ctx,
fn_value.value_ref(),
<span class="string">b"block\0"</span>.as_ptr().cast(),
)
};
<span class="macro">assert!</span>(!block.is_null());
BasicBlock::new(block)
}
<span class="doccomment">/// Create a free-standing Basic Block without adding it to a function.
/// This can be added to a function at a later point in time with
/// [`FnValue::append_basic_block`].
///
/// # Panics
///
/// Panics if LLVM API returns a `null` pointer.
</span><span class="kw">pub fn </span>create_basic_block(<span class="kw-2">&</span><span class="self">self</span>) -> BasicBlock<<span class="lifetime">'llvm</span>> {
<span class="kw">let </span>block = <span class="kw">unsafe </span>{ LLVMCreateBasicBlockInContext(<span class="self">self</span>.ctx, <span class="string">b"block\0"</span>.as_ptr().cast()) };
<span class="macro">assert!</span>(!block.is_null());
BasicBlock::new(block)
}
}
<span class="kw">impl </span>Drop <span class="kw">for </span>Module {
<span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
<span class="kw">unsafe </span>{
<span class="comment">// In case we turned the module into a ThreadSafeModule, we must not dispose the module
// reference because ThreadSafeModule took ownership!
</span><span class="kw">if </span>!<span class="self">self</span>.module.is_null() {
LLVMDisposeModule(<span class="self">self</span>.module);
}
<span class="comment">// Dispose ThreadSafeContext reference (dec ref count) in any case.
</span>LLVMOrcDisposeThreadSafeContext(<span class="self">self</span>.tsctx);
}
}
}
</code></pre></div>
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