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nac3/nac3core/src/codegen/mod.rs

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use crate::{
symbol_resolver::SymbolResolver,
toplevel::{TopLevelContext, TopLevelDef},
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typecheck::{
type_inferencer::{CodeLocation, PrimitiveStore},
typedef::{CallId, FunSignature, SharedUnifier, Type, TypeEnum, Unifier},
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},
};
use crossbeam::channel::{unbounded, Receiver, Sender};
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use inkwell::{
basic_block::BasicBlock,
builder::Builder,
context::Context,
module::Module,
types::{BasicType, BasicTypeEnum},
values::PointerValue,
AddressSpace,
};
use itertools::Itertools;
use parking_lot::{Condvar, Mutex};
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use rustpython_parser::ast::Stmt;
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use std::collections::HashMap;
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use std::sync::{
atomic::{AtomicBool, Ordering},
Arc,
};
use std::thread;
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mod expr;
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mod stmt;
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#[cfg(test)]
mod test;
pub struct CodeGenContext<'ctx, 'a> {
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pub ctx: &'ctx Context,
pub builder: Builder<'ctx>,
pub module: Module<'ctx>,
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pub top_level: &'a TopLevelContext,
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pub unifier: Unifier,
pub resolver: Arc<Box<dyn SymbolResolver + Send + Sync>>,
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pub var_assignment: HashMap<String, PointerValue<'ctx>>,
pub type_cache: HashMap<Type, BasicTypeEnum<'ctx>>,
pub primitives: PrimitiveStore,
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pub calls: Arc<HashMap<CodeLocation, CallId>>,
pub registry: &'a WorkerRegistry,
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// stores the alloca for variables
pub init_bb: BasicBlock<'ctx>,
// where continue and break should go to respectively
// the first one is the test_bb, and the second one is bb after the loop
pub loop_bb: Option<(BasicBlock<'ctx>, BasicBlock<'ctx>)>,
}
type Fp = Box<dyn Fn(&Module) + Send + Sync>;
pub struct WithCall {
fp: Fp,
}
impl WithCall {
pub fn new(fp: Fp) -> WithCall {
WithCall { fp }
}
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pub fn run<'ctx>(&self, m: &Module<'ctx>) {
(self.fp)(m)
}
}
pub struct WorkerRegistry {
sender: Arc<Sender<Option<CodeGenTask>>>,
receiver: Arc<Receiver<Option<CodeGenTask>>>,
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panicked: AtomicBool,
task_count: Mutex<usize>,
thread_count: usize,
wait_condvar: Condvar,
}
impl WorkerRegistry {
pub fn create_workers(
names: &[&str],
top_level_ctx: Arc<TopLevelContext>,
f: Arc<WithCall>,
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) -> (Arc<WorkerRegistry>, Vec<thread::JoinHandle<()>>) {
let (sender, receiver) = unbounded();
let task_count = Mutex::new(0);
let wait_condvar = Condvar::new();
let registry = Arc::new(WorkerRegistry {
sender: Arc::new(sender),
receiver: Arc::new(receiver),
thread_count: names.len(),
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panicked: AtomicBool::new(false),
task_count,
wait_condvar,
});
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let mut handles = Vec::new();
for name in names.iter() {
let top_level_ctx = top_level_ctx.clone();
let registry = registry.clone();
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let registry2 = registry.clone();
let name = name.to_string();
let f = f.clone();
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let handle = thread::spawn(move || {
registry.worker_thread(name, top_level_ctx, f);
});
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let handle = thread::spawn(move || {
if let Err(e) = handle.join() {
if let Some(e) = e.downcast_ref::<&'static str>() {
eprintln!("Got an error: {}", e);
} else {
eprintln!("Got an unknown error: {:?}", e);
}
registry2.panicked.store(true, Ordering::SeqCst);
registry2.wait_condvar.notify_all();
}
});
handles.push(handle);
}
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(registry, handles)
}
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pub fn wait_tasks_complete(&self, handles: Vec<thread::JoinHandle<()>>) {
{
let mut count = self.task_count.lock();
while *count != 0 {
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if self.panicked.load(Ordering::SeqCst) {
break;
}
self.wait_condvar.wait(&mut count);
}
}
for _ in 0..self.thread_count {
self.sender.send(None).unwrap();
}
{
let mut count = self.task_count.lock();
while *count != self.thread_count {
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if self.panicked.load(Ordering::SeqCst) {
break;
}
self.wait_condvar.wait(&mut count);
}
}
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for handle in handles {
handle.join().unwrap();
}
if self.panicked.load(Ordering::SeqCst) {
panic!("tasks panicked");
}
}
pub fn add_task(&self, task: CodeGenTask) {
*self.task_count.lock() += 1;
self.sender.send(Some(task)).unwrap();
}
fn worker_thread(
&self,
module_name: String,
top_level_ctx: Arc<TopLevelContext>,
f: Arc<WithCall>,
) {
let context = Context::create();
let mut builder = context.create_builder();
let mut module = context.create_module(&module_name);
while let Some(task) = self.receiver.recv().unwrap() {
let result = gen_func(&context, self, builder, module, task, top_level_ctx.clone());
builder = result.0;
module = result.1;
*self.task_count.lock() -= 1;
self.wait_condvar.notify_all();
}
// do whatever...
module.verify().unwrap();
f.run(&module);
let mut lock = self.task_count.lock();
*lock += 1;
self.wait_condvar.notify_all();
}
}
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pub struct CodeGenTask {
pub subst: Vec<(Type, Type)>,
pub symbol_name: String,
pub signature: FunSignature,
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pub body: Arc<Vec<Stmt<Option<Type>>>>,
pub calls: Arc<HashMap<CodeLocation, CallId>>,
pub unifier: (SharedUnifier, PrimitiveStore),
pub resolver: Arc<Box<dyn SymbolResolver + Send + Sync>>,
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}
fn get_llvm_type<'ctx>(
ctx: &'ctx Context,
unifier: &mut Unifier,
top_level: &TopLevelContext,
type_cache: &mut HashMap<Type, BasicTypeEnum<'ctx>>,
ty: Type,
) -> BasicTypeEnum<'ctx> {
use TypeEnum::*;
// we assume the type cache should already contain primitive types,
// and they should be passed by value instead of passing as pointer.
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type_cache.get(&unifier.get_representative(ty)).cloned().unwrap_or_else(|| {
match &*unifier.get_ty(ty) {
TObj { obj_id, fields, .. } => {
// a struct with fields in the order of declaration
let top_level_defs = top_level.definitions.read();
let definition = top_level_defs.get(obj_id.0).unwrap();
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let ty = if let TopLevelDef::Class { fields: fields_list, .. } = &*definition.read()
{
let fields = fields.borrow();
let fields = fields_list
.iter()
.map(|f| get_llvm_type(ctx, unifier, top_level, type_cache, fields[&f.0]))
.collect_vec();
ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
} else {
unreachable!()
};
ty
}
TTuple { ty } => {
// a struct with fields in the order present in the tuple
let fields = ty
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.iter()
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.map(|ty| get_llvm_type(ctx, unifier, top_level, type_cache, *ty))
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.collect_vec();
ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
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}
TList { ty } => {
// a struct with an integer and a pointer to an array
let element_type = get_llvm_type(ctx, unifier, top_level, type_cache, *ty);
let fields =
[ctx.i32_type().into(), element_type.ptr_type(AddressSpace::Generic).into()];
ctx.struct_type(&fields, false).ptr_type(AddressSpace::Generic).into()
}
TVirtual { .. } => unimplemented!(),
_ => unreachable!(),
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}
})
}
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pub fn gen_func<'ctx>(
context: &'ctx Context,
registry: &WorkerRegistry,
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builder: Builder<'ctx>,
module: Module<'ctx>,
task: CodeGenTask,
top_level_ctx: Arc<TopLevelContext>,
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) -> (Builder<'ctx>, Module<'ctx>) {
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// unwrap_or(0) is for unit tests without using rayon
let (mut unifier, primitives) = {
let (unifier, primitives) = task.unifier;
(Unifier::from_shared_unifier(&unifier), primitives)
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};
for (a, b) in task.subst.iter() {
// this should be unification between variables and concrete types
// and should not cause any problem...
unifier.unify(*a, *b).unwrap();
}
// rebuild primitive store with unique representatives
let primitives = PrimitiveStore {
int32: unifier.get_representative(primitives.int32),
int64: unifier.get_representative(primitives.int64),
float: unifier.get_representative(primitives.float),
bool: unifier.get_representative(primitives.bool),
none: unifier.get_representative(primitives.none),
};
let mut type_cache: HashMap<_, _> = [
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(unifier.get_representative(primitives.int32), context.i32_type().into()),
(unifier.get_representative(primitives.int64), context.i64_type().into()),
(unifier.get_representative(primitives.float), context.f64_type().into()),
(unifier.get_representative(primitives.bool), context.bool_type().into()),
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]
.iter()
.cloned()
.collect();
let params = task
.signature
.args
.iter()
.map(|arg| {
get_llvm_type(&context, &mut unifier, top_level_ctx.as_ref(), &mut type_cache, arg.ty)
})
.collect_vec();
let fn_type = if unifier.unioned(task.signature.ret, primitives.none) {
context.void_type().fn_type(&params, false)
} else {
get_llvm_type(
&context,
&mut unifier,
top_level_ctx.as_ref(),
&mut type_cache,
task.signature.ret,
)
.fn_type(&params, false)
};
let symbol = &task.symbol_name;
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let fn_val =
module.get_function(symbol).unwrap_or_else(|| module.add_function(symbol, fn_type, None));
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let init_bb = context.append_basic_block(fn_val, "init");
builder.position_at_end(init_bb);
let body_bb = context.append_basic_block(fn_val, "body");
let mut var_assignment = HashMap::new();
for (n, arg) in task.signature.args.iter().enumerate() {
let param = fn_val.get_nth_param(n as u32).unwrap();
let alloca = builder.build_alloca(
get_llvm_type(&context, &mut unifier, top_level_ctx.as_ref(), &mut type_cache, arg.ty),
&arg.name,
);
builder.build_store(alloca, param);
var_assignment.insert(arg.name.clone(), alloca);
}
builder.build_unconditional_branch(body_bb);
builder.position_at_end(body_bb);
let mut code_gen_context = CodeGenContext {
ctx: &context,
resolver: task.resolver,
top_level: top_level_ctx.as_ref(),
calls: task.calls,
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loop_bb: None,
registry,
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var_assignment,
type_cache,
primitives,
init_bb,
builder,
module,
unifier,
};
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let mut returned = false;
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for stmt in task.body.iter() {
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returned = code_gen_context.gen_stmt(stmt);
if returned {
break;
}
}
// after static analysis, only void functions can have no return at the end.
if !returned {
code_gen_context.builder.build_return(None);
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}
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let CodeGenContext { builder, module, .. } = code_gen_context;
(builder, module)
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}