forked from M-Labs/nac3
496 lines
20 KiB
Rust
496 lines
20 KiB
Rust
use nac3core::{
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codegen::{
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expr::gen_call,
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stmt::{gen_block, gen_with},
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CodeGenContext, CodeGenerator,
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},
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symbol_resolver::ValueEnum,
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toplevel::{DefinitionId, GenCall},
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typecheck::typedef::{FunSignature, Type},
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};
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use nac3parser::ast::{Expr, ExprKind, Located, Stmt, StmtKind, StrRef};
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use inkwell::{
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context::Context, module::Linkage, types::IntType, values::BasicValueEnum, AddressSpace,
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};
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use crate::timeline::TimeFns;
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use std::{
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collections::hash_map::DefaultHasher,
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collections::HashMap,
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convert::TryInto,
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hash::{Hash, Hasher},
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sync::Arc,
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};
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pub struct ArtiqCodeGenerator<'a> {
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name: String,
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size_t: u32,
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name_counter: u32,
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start: Option<Expr<Option<Type>>>,
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end: Option<Expr<Option<Type>>>,
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timeline: &'a (dyn TimeFns + Sync),
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}
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impl<'a> ArtiqCodeGenerator<'a> {
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pub fn new(
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name: String,
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size_t: u32,
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timeline: &'a (dyn TimeFns + Sync),
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) -> ArtiqCodeGenerator<'a> {
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assert!(size_t == 32 || size_t == 64);
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ArtiqCodeGenerator { name, size_t, name_counter: 0, start: None, end: None, timeline }
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}
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}
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impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
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fn get_name(&self) -> &str {
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&self.name
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}
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fn get_size_type<'ctx>(&self, ctx: &'ctx Context) -> IntType<'ctx> {
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if self.size_t == 32 {
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ctx.i32_type()
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} else {
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ctx.i64_type()
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}
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}
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fn gen_call<'ctx, 'a>(
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&mut self,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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obj: Option<(Type, ValueEnum<'ctx>)>,
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fun: (&FunSignature, DefinitionId),
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params: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
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) -> Result<Option<BasicValueEnum<'ctx>>, String> {
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let result = gen_call(self, ctx, obj, fun, params)?;
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if let Some(end) = self.end.clone() {
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let old_end = self.gen_expr(ctx, &end)?.unwrap().to_basic_value_enum(ctx, self);
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let now = self.timeline.emit_now_mu(ctx);
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let smax = ctx.module.get_function("llvm.smax.i64").unwrap_or_else(|| {
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let i64 = ctx.ctx.i64_type();
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ctx.module.add_function(
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"llvm.smax.i64",
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i64.fn_type(&[i64.into(), i64.into()], false),
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None,
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)
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});
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let max = ctx
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.builder
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.build_call(smax, &[old_end.into(), now.into()], "smax")
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.try_as_basic_value()
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.left()
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.unwrap();
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let end_store = self.gen_store_target(ctx, &end)?;
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ctx.builder.build_store(end_store, max);
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}
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if let Some(start) = self.start.clone() {
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let start_val = self.gen_expr(ctx, &start)?.unwrap().to_basic_value_enum(ctx, self);
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self.timeline.emit_at_mu(ctx, start_val);
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}
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Ok(result)
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}
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fn gen_with<'ctx, 'a>(
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&mut self,
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ctx: &mut CodeGenContext<'ctx, 'a>,
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stmt: &Stmt<Option<Type>>,
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) -> Result<(), String> {
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if let StmtKind::With { items, body, .. } = &stmt.node {
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if items.len() == 1 && items[0].optional_vars.is_none() {
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let item = &items[0];
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// Behavior of parallel and sequential:
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// Each function call (indirectly, can be inside a sequential block) within a parallel
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// block will update the end variable to the maximum now_mu in the block.
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// Each function call directly inside a parallel block will reset the timeline after
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// execution. A parallel block within a sequential block (or not within any block) will
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// set the timeline to the max now_mu within the block (and the outer max now_mu will also
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// be updated).
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//
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// Implementation: We track the start and end separately.
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// - If there is a start variable, it indicates that we are directly inside a
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// parallel block and we have to reset the timeline after every function call.
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// - If there is a end variable, it indicates that we are (indirectly) inside a
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// parallel block, and we should update the max end value.
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if let ExprKind::Name { id, ctx: name_ctx } = &item.context_expr.node {
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if id == &"parallel".into() {
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let old_start = self.start.take();
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let old_end = self.end.take();
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let now = if let Some(old_start) = &old_start {
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self.gen_expr(ctx, old_start)?.unwrap().to_basic_value_enum(ctx, self)
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} else {
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self.timeline.emit_now_mu(ctx)
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};
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// Emulate variable allocation, as we need to use the CodeGenContext
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// HashMap to store our variable due to lifetime limitation
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// Note: we should be able to store variables directly if generic
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// associative type is used by limiting the lifetime of CodeGenerator to
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// the LLVM Context.
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// The name is guaranteed to be unique as users cannot use this as variable
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// name.
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self.start = old_start.clone().map_or_else(|| {
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let start = format!("with-{}-start", self.name_counter).into();
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let start_expr = Located {
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// location does not matter at this point
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location: stmt.location,
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node: ExprKind::Name { id: start, ctx: name_ctx.clone() },
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custom: Some(ctx.primitives.int64),
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};
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let start = self.gen_store_target(ctx, &start_expr)?;
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ctx.builder.build_store(start, now);
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Ok(Some(start_expr)) as Result<_, String>
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}, |v| Ok(Some(v)))?;
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let end = format!("with-{}-end", self.name_counter).into();
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let end_expr = Located {
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// location does not matter at this point
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location: stmt.location,
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node: ExprKind::Name { id: end, ctx: name_ctx.clone() },
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custom: Some(ctx.primitives.int64),
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};
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let end = self.gen_store_target(ctx, &end_expr)?;
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ctx.builder.build_store(end, now);
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self.end = Some(end_expr);
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self.name_counter += 1;
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gen_block(self, ctx, body.iter())?;
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let current = ctx.builder.get_insert_block().unwrap();
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// if the current block is terminated, move before the terminator
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// we want to set the timeline before reaching the terminator
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// TODO: This may be unsound if there are multiple exit paths in the
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// block... e.g.
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// if ...:
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// return
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// Perhaps we can fix this by using actual with block?
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let reset_position = if let Some(terminator) = current.get_terminator() {
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ctx.builder.position_before(&terminator);
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true
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} else {
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false
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};
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// set duration
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let end_expr = self.end.take().unwrap();
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let end_val =
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self.gen_expr(ctx, &end_expr)?.unwrap().to_basic_value_enum(ctx, self);
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// inside a sequential block
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if old_start.is_none() {
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self.timeline.emit_at_mu(ctx, end_val);
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}
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// inside a parallel block, should update the outer max now_mu
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if let Some(old_end) = &old_end {
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let outer_end_val =
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self.gen_expr(ctx, old_end)?.unwrap().to_basic_value_enum(ctx, self);
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let smax =
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ctx.module.get_function("llvm.smax.i64").unwrap_or_else(|| {
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let i64 = ctx.ctx.i64_type();
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ctx.module.add_function(
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"llvm.smax.i64",
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i64.fn_type(&[i64.into(), i64.into()], false),
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None,
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)
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});
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let max = ctx
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.builder
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.build_call(smax, &[end_val.into(), outer_end_val.into()], "smax")
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.try_as_basic_value()
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.left()
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.unwrap();
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let outer_end = self.gen_store_target(ctx, old_end)?;
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ctx.builder.build_store(outer_end, max);
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}
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self.start = old_start;
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self.end = old_end;
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if reset_position {
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ctx.builder.position_at_end(current);
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}
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return Ok(());
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} else if id == &"sequential".into() {
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let start = self.start.take();
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for stmt in body.iter() {
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self.gen_stmt(ctx, stmt)?;
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if ctx.is_terminated() {
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break;
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}
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}
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self.start = start;
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return Ok(());
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}
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}
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}
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// not parallel/sequential
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gen_with(self, ctx, stmt)
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} else {
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unreachable!()
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}
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}
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}
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fn gen_rpc_tag<'ctx, 'a>(ctx: &mut CodeGenContext<'ctx, 'a>, ty: Type, buffer: &mut Vec<u8>) -> Result<(), String> {
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use nac3core::typecheck::typedef::TypeEnum::*;
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let int32 = ctx.primitives.int32;
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let int64 = ctx.primitives.int64;
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let float = ctx.primitives.float;
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let bool = ctx.primitives.bool;
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let str = ctx.primitives.str;
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let none = ctx.primitives.none;
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if ctx.unifier.unioned(ty, int32) {
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buffer.push(b'i');
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} else if ctx.unifier.unioned(ty, int64) {
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buffer.push(b'I');
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} else if ctx.unifier.unioned(ty, float) {
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buffer.push(b'f');
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} else if ctx.unifier.unioned(ty, bool) {
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buffer.push(b'b');
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} else if ctx.unifier.unioned(ty, str) {
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buffer.push(b's');
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} else if ctx.unifier.unioned(ty, none) {
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buffer.push(b'n');
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} else {
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let ty_enum = ctx.unifier.get_ty(ty);
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match &*ty_enum {
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TTuple { ty } => {
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buffer.push(b't');
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buffer.push(ty.len() as u8);
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for ty in ty {
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gen_rpc_tag(ctx, *ty, buffer)?;
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}
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}
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TList { ty } => {
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buffer.push(b'l');
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gen_rpc_tag(ctx, *ty, buffer)?;
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}
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// we should return an error, this will be fixed after improving error message
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// as this requires returning an error during codegen
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_ => return Err(format!("Unsupported type: {:?}", ctx.unifier.stringify(ty))),
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}
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}
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Ok(())
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}
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fn rpc_codegen_callback_fn<'ctx, 'a>(
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ctx: &mut CodeGenContext<'ctx, 'a>,
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obj: Option<(Type, ValueEnum<'ctx>)>,
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fun: (&FunSignature, DefinitionId),
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args: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
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generator: &mut dyn CodeGenerator,
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) -> Result<Option<BasicValueEnum<'ctx>>, String> {
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let ptr_type = ctx.ctx.i8_type().ptr_type(inkwell::AddressSpace::Generic);
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let size_type = generator.get_size_type(ctx.ctx);
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let int8 = ctx.ctx.i8_type();
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let int32 = ctx.ctx.i32_type();
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let tag_ptr_type = ctx.ctx.struct_type(&[ptr_type.into(), size_type.into()], false);
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let service_id = int32.const_int(fun.1.0 as u64, false);
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// -- setup rpc tags
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let mut tag = Vec::new();
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if obj.is_some() {
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tag.push(b'O');
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}
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for arg in fun.0.args.iter() {
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gen_rpc_tag(ctx, arg.ty, &mut tag)?;
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}
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tag.push(b':');
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gen_rpc_tag(ctx, fun.0.ret, &mut tag)?;
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let mut hasher = DefaultHasher::new();
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tag.hash(&mut hasher);
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let hash = format!("{}", hasher.finish());
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let tag_ptr = ctx
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.module
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.get_global(hash.as_str())
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.unwrap_or_else(|| {
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let tag_arr_ptr = ctx.module.add_global(
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int8.array_type(tag.len() as u32),
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None,
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format!("tagptr{}", fun.1 .0).as_str(),
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);
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tag_arr_ptr.set_initializer(&int8.const_array(
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&tag.iter().map(|v| int8.const_int(*v as u64, false)).collect::<Vec<_>>(),
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));
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tag_arr_ptr.set_linkage(Linkage::Private);
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let tag_ptr = ctx.module.add_global(tag_ptr_type, None, &hash);
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tag_ptr.set_linkage(Linkage::Private);
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tag_ptr.set_initializer(&ctx.ctx.const_struct(
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&[
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tag_arr_ptr.as_pointer_value().const_cast(ptr_type).into(),
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size_type.const_int(tag.len() as u64, false).into(),
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],
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false,
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));
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tag_ptr
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})
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.as_pointer_value();
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let arg_length = args.len() + if obj.is_some() { 1 } else { 0 };
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let stacksave = ctx.module.get_function("llvm.stacksave").unwrap_or_else(|| {
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ctx.module.add_function("llvm.stacksave", ptr_type.fn_type(&[], false), None)
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});
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let stackrestore = ctx.module.get_function("llvm.stackrestore").unwrap_or_else(|| {
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ctx.module.add_function(
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"llvm.stackrestore",
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ctx.ctx.void_type().fn_type(&[ptr_type.into()], false),
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None,
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)
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});
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let stackptr = ctx.builder.build_call(stacksave, &[], "rpc.stack");
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let args_ptr = ctx.builder.build_array_alloca(
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ptr_type,
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ctx.ctx.i32_type().const_int(arg_length as u64, false),
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"argptr",
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);
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// -- rpc args handling
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let mut keys = fun.0.args.clone();
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let mut mapping = HashMap::new();
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for (key, value) in args.into_iter() {
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mapping.insert(key.unwrap_or_else(|| keys.remove(0).name), value);
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}
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// default value handling
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for k in keys.into_iter() {
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mapping.insert(k.name, ctx.gen_symbol_val(generator, &k.default_value.unwrap()).into());
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}
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// reorder the parameters
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let mut real_params = fun
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.0
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.args
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.iter()
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.map(|arg| mapping.remove(&arg.name).unwrap().to_basic_value_enum(ctx, generator))
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.collect::<Vec<_>>();
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if let Some(obj) = obj {
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if let ValueEnum::Static(obj) = obj.1 {
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real_params.insert(0, obj.get_const_obj(ctx, generator));
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} else {
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// should be an error here...
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panic!("only host object is allowed");
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}
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}
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for (i, arg) in real_params.iter().enumerate() {
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let arg_slot = if arg.is_pointer_value() {
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arg.into_pointer_value()
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} else {
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let arg_slot = ctx.builder.build_alloca(arg.get_type(), &format!("rpc.arg{}", i));
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ctx.builder.build_store(arg_slot, *arg);
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arg_slot
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};
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let arg_slot = ctx.builder.build_bitcast(arg_slot, ptr_type, "rpc.arg");
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let arg_ptr = unsafe {
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ctx.builder.build_gep(
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args_ptr,
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&[int32.const_int(i as u64, false)],
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&format!("rpc.arg{}", i),
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)
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};
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ctx.builder.build_store(arg_ptr, arg_slot);
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}
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// call
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let rpc_send = ctx.module.get_function("rpc_send").unwrap_or_else(|| {
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ctx.module.add_function(
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"rpc_send",
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ctx.ctx.void_type().fn_type(
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&[
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int32.into(),
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tag_ptr_type.ptr_type(AddressSpace::Generic).into(),
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ptr_type.ptr_type(AddressSpace::Generic).into(),
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],
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false,
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),
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None,
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)
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});
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ctx.builder.build_call(
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rpc_send,
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&[service_id.into(), tag_ptr.into(), args_ptr.into()],
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"rpc.send",
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);
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// reclaim stack space used by arguments
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ctx.builder.build_call(
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stackrestore,
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&[stackptr.try_as_basic_value().unwrap_left().into()],
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"rpc.stackrestore",
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);
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// -- receive value:
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// T result = {
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// void *ret_ptr = alloca(sizeof(T));
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// void *ptr = ret_ptr;
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// loop: int size = rpc_recv(ptr);
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// // Non-zero: Provide `size` bytes of extra storage for variable-length data.
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// if(size) { ptr = alloca(size); goto loop; }
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// else *(T*)ret_ptr
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// }
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let rpc_recv = ctx.module.get_function("rpc_recv").unwrap_or_else(|| {
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ctx.module.add_function("rpc_recv", int32.fn_type(&[ptr_type.into()], false), None)
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});
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if ctx.unifier.unioned(fun.0.ret, ctx.primitives.none) {
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ctx.build_call_or_invoke(rpc_recv, &[ptr_type.const_null().into()], "rpc_recv");
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return Ok(None)
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}
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let prehead_bb = ctx.builder.get_insert_block().unwrap();
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let current_function = prehead_bb.get_parent().unwrap();
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let head_bb = ctx.ctx.append_basic_block(current_function, "rpc.head");
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let alloc_bb = ctx.ctx.append_basic_block(current_function, "rpc.continue");
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let tail_bb = ctx.ctx.append_basic_block(current_function, "rpc.tail");
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let mut ret_ty = ctx.get_llvm_type(generator, fun.0.ret);
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let need_load = !ret_ty.is_pointer_type();
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if ret_ty.is_pointer_type() {
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ret_ty = ret_ty.into_pointer_type().get_element_type().try_into().unwrap();
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}
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let slot = ctx.builder.build_alloca(ret_ty, "rpc.ret.slot");
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let slotgen = ctx.builder.build_bitcast(slot, ptr_type, "rpc.ret.ptr");
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ctx.builder.build_unconditional_branch(head_bb);
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ctx.builder.position_at_end(head_bb);
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let phi = ctx.builder.build_phi(ptr_type, "rpc.ptr");
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phi.add_incoming(&[(&slotgen, prehead_bb)]);
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let alloc_size = ctx
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|
.build_call_or_invoke(rpc_recv, &[phi.as_basic_value()], "rpc.size.next")
|
|
.unwrap()
|
|
.into_int_value();
|
|
let is_done = ctx.builder.build_int_compare(
|
|
inkwell::IntPredicate::EQ,
|
|
int32.const_zero(),
|
|
alloc_size,
|
|
"rpc.done",
|
|
);
|
|
|
|
ctx.builder.build_conditional_branch(is_done, tail_bb, alloc_bb);
|
|
ctx.builder.position_at_end(alloc_bb);
|
|
|
|
let alloc_ptr = ctx.builder.build_array_alloca(ptr_type, alloc_size, "rpc.alloc");
|
|
let alloc_ptr = ctx.builder.build_bitcast(alloc_ptr, ptr_type, "rpc.alloc.ptr");
|
|
phi.add_incoming(&[(&alloc_ptr, alloc_bb)]);
|
|
ctx.builder.build_unconditional_branch(head_bb);
|
|
|
|
ctx.builder.position_at_end(tail_bb);
|
|
|
|
Ok(if need_load {
|
|
let result = ctx.builder.build_load(slot, "rpc.result");
|
|
ctx.builder.build_call(
|
|
stackrestore,
|
|
&[stackptr.try_as_basic_value().unwrap_left().into()],
|
|
"rpc.stackrestore",
|
|
);
|
|
Some(result)
|
|
} else {
|
|
Some(slot.into())
|
|
})
|
|
}
|
|
|
|
pub fn rpc_codegen_callback() -> Arc<GenCall> {
|
|
Arc::new(GenCall::new(Box::new(|ctx, obj, fun, args, generator| {
|
|
rpc_codegen_callback_fn(ctx, obj, fun, args, generator)
|
|
})))
|
|
}
|