nac3/nac3artiq/src/codegen.rs

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use nac3core::{
codegen::{expr::gen_call, stmt::gen_with, CodeGenContext, CodeGenerator},
toplevel::DefinitionId,
typecheck::typedef::{FunSignature, Type},
};
2021-11-03 17:11:00 +08:00
use nac3parser::ast::{Expr, ExprKind, Located, Stmt, StmtKind, StrRef};
use inkwell::values::BasicValueEnum;
use crate::timeline::TimeFns;
pub struct ArtiqCodeGenerator<'a> {
name: String,
name_counter: u32,
start: Option<Expr<Option<Type>>>,
end: Option<Expr<Option<Type>>>,
timeline: &'a (dyn TimeFns + Sync),
}
impl<'a> ArtiqCodeGenerator<'a> {
pub fn new(name: String, timeline: &'a (dyn TimeFns + Sync)) -> ArtiqCodeGenerator<'a> {
ArtiqCodeGenerator {
name,
name_counter: 0,
start: None,
end: None,
timeline,
}
}
}
impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
fn get_name(&self) -> &str {
&self.name
}
fn gen_call<'ctx, 'a>(
&mut self,
ctx: &mut CodeGenContext<'ctx, 'a>,
obj: Option<(Type, BasicValueEnum<'ctx>)>,
fun: (&FunSignature, DefinitionId),
params: Vec<(Option<StrRef>, BasicValueEnum<'ctx>)>,
) -> Option<BasicValueEnum<'ctx>> {
let result = gen_call(self, ctx, obj, fun, params);
if let Some(end) = self.end.clone() {
let old_end = self.gen_expr(ctx, &end).unwrap();
let now = self.timeline.emit_now_mu(ctx);
let smax = ctx.module.get_function("llvm.smax.i64").unwrap_or_else(|| {
let i64 = ctx.ctx.i64_type();
ctx.module.add_function(
"llvm.smax.i64",
i64.fn_type(&[i64.into(), i64.into()], false),
None,
)
});
let max = ctx
.builder
.build_call(smax, &[old_end, now], "smax")
.try_as_basic_value()
.left()
.unwrap();
let end_store = self.gen_store_target(ctx, &end);
ctx.builder.build_store(end_store, max);
}
if let Some(start) = self.start.clone() {
let start_val = self.gen_expr(ctx, &start).unwrap();
self.timeline.emit_at_mu(ctx, start_val);
}
result
}
fn gen_with<'ctx, 'a>(
&mut self,
ctx: &mut CodeGenContext<'ctx, 'a>,
stmt: &Stmt<Option<Type>>,
) -> bool {
if let StmtKind::With { items, body, .. } = &stmt.node {
if items.len() == 1 && items[0].optional_vars.is_none() {
let item = &items[0];
// Behavior of parallel and sequential:
// Each function call (indirectly, can be inside a sequential block) within a parallel
// block will update the end variable to the maximum now_mu in the block.
// Each function call directly inside a parallel block will reset the timeline after
// execution. A parallel block within a sequential block (or not within any block) will
// set the timeline to the max now_mu within the block (and the outer max now_mu will also
// be updated).
//
// Implementation: We track the start and end separately.
// - If there is a start variable, it indicates that we are directly inside a
// parallel block and we have to reset the timeline after every function call.
// - If there is a end variable, it indicates that we are (indirectly) inside a
// parallel block, and we should update the max end value.
if let ExprKind::Name { id, ctx: name_ctx } = &item.context_expr.node {
if id == &"parallel".into() {
let old_start = self.start.take();
let old_end = self.end.take();
let now = if let Some(old_start) = &old_start {
self.gen_expr(ctx, old_start).unwrap()
} else {
self.timeline.emit_now_mu(ctx)
};
// Emulate variable allocation, as we need to use the CodeGenContext
// HashMap to store our variable due to lifetime limitation
// Note: we should be able to store variables directly if generic
// associative type is used by limiting the lifetime of CodeGenerator to
// the LLVM Context.
// The name is guaranteed to be unique as users cannot use this as variable
// name.
self.start = old_start.clone().or_else(|| {
let start = format!("with-{}-start", self.name_counter).into();
let start_expr = Located {
// location does not matter at this point
location: stmt.location,
node: ExprKind::Name {
id: start,
ctx: name_ctx.clone(),
},
custom: Some(ctx.primitives.int64),
};
let start = self.gen_store_target(ctx, &start_expr);
ctx.builder.build_store(start, now);
Some(start_expr)
});
let end = format!("with-{}-end", self.name_counter).into();
let end_expr = Located {
// location does not matter at this point
location: stmt.location,
node: ExprKind::Name {
id: end,
ctx: name_ctx.clone(),
},
custom: Some(ctx.primitives.int64),
};
let end = self.gen_store_target(ctx, &end_expr);
ctx.builder.build_store(end, now);
self.end = Some(end_expr);
self.name_counter += 1;
let mut exited = false;
for stmt in body.iter() {
if self.gen_stmt(ctx, stmt) {
exited = true;
break;
}
}
// set duration
let end_expr = self.end.take().unwrap();
let end_val = self.gen_expr(ctx, &end_expr).unwrap();
// inside an sequential block
if old_start.is_none() {
self.timeline.emit_at_mu(ctx, end_val);
}
// inside a parallel block, should update the outer max now_mu
if let Some(old_end) = &old_end {
let outer_end_val = self.gen_expr(ctx, old_end).unwrap();
let smax = ctx.module.get_function("llvm.smax.i64").unwrap_or_else(|| {
let i64 = ctx.ctx.i64_type();
ctx.module.add_function(
"llvm.smax.i64",
i64.fn_type(&[i64.into(), i64.into()], false),
None,
)
});
let max = ctx
.builder
.build_call(smax, &[end_val, outer_end_val], "smax")
.try_as_basic_value()
.left()
.unwrap();
let outer_end = self.gen_store_target(ctx, old_end);
ctx.builder.build_store(outer_end, max);
}
self.start = old_start;
self.end = old_end;
return exited;
} else if id == &"sequential".into() {
let start = self.start.take();
for stmt in body.iter() {
if self.gen_stmt(ctx, stmt) {
self.start = start;
return true;
}
}
self.start = start;
return false;
}
}
}
// not parallel/sequential
gen_with(self, ctx, stmt)
} else {
unreachable!()
}
}
}