M-Labs/nac3
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nac3core: fix if expr codegen

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This commit is contained in:
ychenfo 2022-03-28 22:53:58 +08:00
parent 94eebde4ea
commit 393f01c08c
1 changed files with 20 additions and 3 deletions
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23
nac3core/src/codegen/expr.rs
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@ -1226,6 +1226,14 @@ pub fn gen_expr<'ctx, 'a, G: CodeGenerator>(
.unwrap()
.to_basic_value_enum(ctx, generator)?
.into_int_value();
let body_ty = body.custom.unwrap();
let is_none = ctx.unifier.get_representative(body_ty) == ctx.primitives.none;
let result = if !is_none {
let llvm_ty = ctx.get_llvm_type(generator, body_ty);
Some(ctx.builder.build_alloca(llvm_ty, "if_exp_result"))
} else {
None
};
let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
let then_bb = ctx.ctx.append_basic_block(current, "then");
let else_bb = ctx.ctx.append_basic_block(current, "else");
@ -1233,14 +1241,23 @@ pub fn gen_expr<'ctx, 'a, G: CodeGenerator>(
ctx.builder.build_conditional_branch(test, then_bb, else_bb);
ctx.builder.position_at_end(then_bb);
let a = generator.gen_expr(ctx, body)?.unwrap().to_basic_value_enum(ctx, generator)?;
match result {
None => None,
Some(v) => Some(ctx.builder.build_store(v, a))
};
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(else_bb);
let b = generator.gen_expr(ctx, orelse)?.unwrap().to_basic_value_enum(ctx, generator)?;
match result {
None => None,
Some(v) => Some(ctx.builder.build_store(v, b))
};
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(cont_bb);
let phi = ctx.builder.build_phi(a.get_type(), "ifexpr");
phi.add_incoming(&[(&a, then_bb), (&b, else_bb)]);
phi.as_basic_value().into()
match result {
None => return Ok(None),
Some(v) => return Ok(Some(ctx.builder.build_load(v, "if_exp_val_load").into()))
}
}
ExprKind::Call { func, args, keywords } => {
let mut params = args