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/*
* This is a minimal home-made LLVM wrapper, we don't use:
* Inkwell: it's too strongly-typed (splitting Value into variants) and does not
* expose underlying raw LLVM value
* LLVM-ir: can't emit code
* rustc_codegen_llvm: the best of the bunch, but too much work to split it out
*/
use std::error::Error;
use std::ffi::CStr;
use std::fmt::{self, Debug, Display};
use std::mem;
use std::ptr;
use zluda_llvm::analysis::*;
use zluda_llvm::core::*;
use zluda_llvm::prelude::*;
macro_rules! llvm_wrapper {
($([
$rust_name:ident,
$llvm_name:path,
$ctor:ident( $($arg_name:ident : $arg_type: ty),* ),
$dtor:path
]),+) => {
$(
pub struct $rust_name($llvm_name);
impl Drop for $rust_name {
fn drop(&mut self) {
unsafe { $dtor(self.0) }
}
}
impl $rust_name {
#[allow(non_snake_case, dead_code)]
pub(crate) unsafe fn create( $($arg_name : $arg_type),* ) -> $rust_name {
$rust_name($ctor( $($arg_name),* ))
}
#[allow(non_snake_case, dead_code)]
pub(crate) unsafe fn from_ffi(x: $llvm_name) -> $rust_name {
$rust_name(x)
}
#[allow(dead_code)]
pub(crate) fn get(&self) -> $llvm_name {
self.0
}
}
)+
};
}
llvm_wrapper!(
[
Context,
LLVMContextRef,
LLVMContextCreate(),
LLVMContextDispose
],
[
Module,
LLVMModuleRef,
LLVMModuleCreateWithNameInContext(ModuleID: *const i8, C: LLVMContextRef),
LLVMDisposeModule
],
[
Builder,
LLVMBuilderRef,
LLVMCreateBuilderInContext(C: LLVMContextRef),
LLVMDisposeBuilder
],
[
MemoryBuffer,
LLVMMemoryBufferRef,
LLVMCreateMemoryBufferWithMemoryRangeCopy(
InputData: *const std::os::raw::c_char,
InputDataLength: usize,
BufferName: *const std::os::raw::c_char
),
LLVMDisposeMemoryBuffer
]
);
impl Module {
pub(crate) fn verify(&self) -> Option<Message> {
let mut msg = ptr::null_mut();
let is_broken = unsafe {
LLVMVerifyModule(
self.get(),
LLVMVerifierFailureAction::LLVMReturnStatusAction,
&mut msg,
)
};
if is_broken != 0 {
Some(Message::from_ffi(msg))
} else {
None
}
}
}
impl MemoryBuffer {
pub unsafe fn create_no_copy<T>(input: &[T], requires_null_terminator: bool) -> Self {
let mut len = input.len();
if requires_null_terminator {
len -= 1;
}
MemoryBuffer(LLVMCreateMemoryBufferWithMemoryRange(
input.as_ptr() as _,
len * mem::size_of::<T>(),
ptr::null_mut(),
if requires_null_terminator { 1 } else { 0 },
))
}
pub fn as_slice<'a>(&'a self) -> &'a [u8] {
let len = unsafe { LLVMGetBufferSize(self.get()) };
let start = unsafe { LLVMGetBufferStart(self.get()) };
unsafe { std::slice::from_raw_parts(start as _, len) }
}
}
impl AsRef<[u8]> for MemoryBuffer {
fn as_ref(&self) -> &[u8] {
self.as_slice()
}
}
#[cfg(test)]
pub(crate) unsafe fn parse_ir_in_context(
context: &Context,
mem_buf: MemoryBuffer,
) -> Result<Module, Message> {
use zluda_llvm::ir_reader::*;
let mut module = ptr::null_mut();
let mut message = ptr::null_mut();
let result = LLVMParseIRInContext(context.get(), mem_buf.get(), &mut module, &mut message);
mem::forget(mem_buf);
if result == 0 {
Ok(Module::from_ffi(module))
} else {
Err(Message(message))
}
}
pub struct Message(*mut i8);
impl Error for Message {}
impl Debug for Message {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
Display::fmt(self, f)
}
}
impl Display for Message {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.as_cstr().to_str().map_err(|_| fmt::Error)?)
}
}
impl Message {
pub(crate) fn as_cstr<'a>(&'a self) -> &'a CStr {
unsafe { CStr::from_ptr(self.0) }
}
pub(crate) fn from_ffi(msg: *mut i8) -> Self {
Self(msg)
}
}
impl Drop for Message {
fn drop(&mut self) {
unsafe { LLVMDisposeMessage(self.0) };
}
}
pub(crate) fn void_type(llvm_ctx: &Context) -> LLVMTypeRef {
unsafe { LLVMVoidTypeInContext(llvm_ctx.get()) }
}
|
