forked from M-Labs/nac3
222 lines
9.4 KiB
Rust
222 lines
9.4 KiB
Rust
use super::{
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expr::{assert_int_val, assert_pointer_val},
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CodeGenContext,
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};
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use crate::typecheck::typedef::Type;
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use inkwell::values::{BasicValue, BasicValueEnum, PointerValue};
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use rustpython_parser::ast::{Expr, ExprKind, Stmt, StmtKind};
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impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
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fn gen_var(&mut self, ty: Type) -> PointerValue<'ctx> {
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// put the alloca in init block
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let current = self.builder.get_insert_block().unwrap();
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// position before the last branching instruction...
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self.builder.position_before(&self.init_bb.get_last_instruction().unwrap());
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let ty = self.get_llvm_type(ty);
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let ptr = self.builder.build_alloca(ty, "tmp");
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self.builder.position_at_end(current);
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ptr
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}
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fn parse_pattern(&mut self, pattern: &Expr<Option<Type>>) -> PointerValue<'ctx> {
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// very similar to gen_expr, but we don't do an extra load at the end
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// and we flatten nested tuples
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match &pattern.node {
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ExprKind::Name { id, .. } => {
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self.var_assignment.get(id).cloned().unwrap_or_else(|| {
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let ptr = self.gen_var(pattern.custom.unwrap());
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self.var_assignment.insert(id.clone(), ptr);
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ptr
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})
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}
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ExprKind::Attribute { value, attr, .. } => {
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let index = self.get_attr_index(value.custom.unwrap(), *attr);
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let val = self.gen_expr(value).unwrap();
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let ptr = if let BasicValueEnum::PointerValue(v) = val {
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v
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} else {
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unreachable!();
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};
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unsafe {
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self.builder.build_in_bounds_gep(
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ptr,
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&[
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self.ctx.i32_type().const_zero(),
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self.ctx.i32_type().const_int(index as u64, false),
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],
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"attr",
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)
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}
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}
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ExprKind::Subscript { value, slice, .. } => {
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let i32_type = self.ctx.i32_type();
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let v = assert_pointer_val(self.gen_expr(value).unwrap());
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let index = assert_int_val(self.gen_expr(slice).unwrap());
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unsafe {
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let ptr_to_arr = self.builder.build_in_bounds_gep(
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v,
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&[i32_type.const_zero(), i32_type.const_int(1, false)],
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"ptr_to_arr",
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);
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let arr_ptr =
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assert_pointer_val(self.builder.build_load(ptr_to_arr, "loadptr"));
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self.builder.build_gep(arr_ptr, &[index], "loadarrgep")
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}
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}
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_ => unreachable!(),
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}
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}
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fn gen_assignment(&mut self, target: &Expr<Option<Type>>, value: BasicValueEnum<'ctx>) {
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let i32_type = self.ctx.i32_type();
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if let ExprKind::Tuple { elts, .. } = &target.node {
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if let BasicValueEnum::PointerValue(ptr) = value {
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for (i, elt) in elts.iter().enumerate() {
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unsafe {
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let t = self.builder.build_in_bounds_gep(
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ptr,
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&[i32_type.const_zero(), i32_type.const_int(i as u64, false)],
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"elem",
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);
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let v = self.builder.build_load(t, "tmpload");
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self.gen_assignment(elt, v);
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}
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}
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} else {
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unreachable!()
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}
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} else {
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let ptr = self.parse_pattern(target);
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self.builder.build_store(ptr, value);
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}
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}
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// return true if it contains terminator
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pub fn gen_stmt(&mut self, stmt: &Stmt<Option<Type>>) -> bool {
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match &stmt.node {
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StmtKind::Pass => {},
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StmtKind::Expr { value } => {
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self.gen_expr(&value);
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}
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StmtKind::Return { value } => {
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let value = value.as_ref().map(|v| self.gen_expr(&v).unwrap());
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let value = value.as_ref().map(|v| v as &dyn BasicValue);
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self.builder.build_return(value);
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return true;
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}
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StmtKind::AnnAssign { target, value, .. } => {
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if let Some(value) = value {
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let value = self.gen_expr(&value).unwrap();
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self.gen_assignment(target, value);
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}
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}
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StmtKind::Assign { targets, value, .. } => {
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let value = self.gen_expr(&value).unwrap();
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for target in targets.iter() {
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self.gen_assignment(target, value);
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}
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}
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StmtKind::Continue => {
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self.builder.build_unconditional_branch(self.loop_bb.unwrap().0);
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return true;
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}
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StmtKind::Break => {
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self.builder.build_unconditional_branch(self.loop_bb.unwrap().1);
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return true;
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}
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StmtKind::If { test, body, orelse } => {
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let current = self.builder.get_insert_block().unwrap().get_parent().unwrap();
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let test_bb = self.ctx.append_basic_block(current, "test");
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let body_bb = self.ctx.append_basic_block(current, "body");
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let mut cont_bb = None; // self.ctx.append_basic_block(current, "cont");
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// if there is no orelse, we just go to cont_bb
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let orelse_bb = if orelse.is_empty() {
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cont_bb = Some(self.ctx.append_basic_block(current, "cont"));
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cont_bb.unwrap()
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} else {
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self.ctx.append_basic_block(current, "orelse")
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};
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self.builder.build_unconditional_branch(test_bb);
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self.builder.position_at_end(test_bb);
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let test = self.gen_expr(test).unwrap();
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if let BasicValueEnum::IntValue(test) = test {
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self.builder.build_conditional_branch(test, body_bb, orelse_bb);
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} else {
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unreachable!()
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};
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self.builder.position_at_end(body_bb);
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let mut exited = false;
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for stmt in body.iter() {
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exited = self.gen_stmt(stmt);
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if exited {
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break;
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}
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}
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if !exited {
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if cont_bb.is_none() {
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cont_bb = Some(self.ctx.append_basic_block(current, "cont"));
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}
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self.builder.build_unconditional_branch(cont_bb.unwrap());
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}
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if !orelse.is_empty() {
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exited = false;
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self.builder.position_at_end(orelse_bb);
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for stmt in orelse.iter() {
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exited = self.gen_stmt(stmt);
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if exited {
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break;
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}
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}
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if !exited {
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if cont_bb.is_none() {
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cont_bb = Some(self.ctx.append_basic_block(current, "cont"));
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}
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self.builder.build_unconditional_branch(cont_bb.unwrap());
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}
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}
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if let Some(cont_bb) = cont_bb {
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self.builder.position_at_end(cont_bb);
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}
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}
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StmtKind::While { test, body, orelse } => {
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let current = self.builder.get_insert_block().unwrap().get_parent().unwrap();
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let test_bb = self.ctx.append_basic_block(current, "test");
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let body_bb = self.ctx.append_basic_block(current, "body");
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let cont_bb = self.ctx.append_basic_block(current, "cont");
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// if there is no orelse, we just go to cont_bb
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let orelse_bb = if orelse.is_empty() {
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cont_bb
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} else {
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self.ctx.append_basic_block(current, "orelse")
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};
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// store loop bb information and restore it later
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let loop_bb = self.loop_bb.replace((test_bb, cont_bb));
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self.builder.build_unconditional_branch(test_bb);
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self.builder.position_at_end(test_bb);
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let test = self.gen_expr(test).unwrap();
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if let BasicValueEnum::IntValue(test) = test {
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self.builder.build_conditional_branch(test, body_bb, orelse_bb);
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} else {
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unreachable!()
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};
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self.builder.position_at_end(body_bb);
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for stmt in body.iter() {
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self.gen_stmt(stmt);
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}
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self.builder.build_unconditional_branch(test_bb);
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if !orelse.is_empty() {
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self.builder.position_at_end(orelse_bb);
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for stmt in orelse.iter() {
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self.gen_stmt(stmt);
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}
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self.builder.build_unconditional_branch(cont_bb);
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}
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self.builder.position_at_end(cont_bb);
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self.loop_bb = loop_bb;
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}
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_ => unimplemented!("{:?}", stmt),
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};
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false
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}
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}
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