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report unbound identifier errors

This commit is contained in:
Sebastien Bourdeauducq 2020-03-29 12:20:40 +08:00
parent befd01b240
commit 10fd4d3c27
1 changed files with 9 additions and 4 deletions
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13
src/main.rs
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@ -23,6 +23,7 @@ enum CompileErrorKind {
MissingTypeAnnotation,
UnknownTypeAnnotation,
IncompatibleTypes,
UnboundIdentifier,
Internal(&'static str)
}
@ -37,6 +38,8 @@ impl fmt::Display for CompileErrorKind {
=> write!(f, "Unknown type annotation"),
CompileErrorKind::IncompatibleTypes
=> write!(f, "Incompatible types"),
CompileErrorKind::UnboundIdentifier
=> write!(f, "Unbound identifier"),
CompileErrorKind::Internal(details)
=> write!(f, "Internal compiler error: {}", details),
}
@ -171,12 +174,14 @@ impl<'ctx> CodeGen<'ctx> {
) -> CompileResult<values::BasicValueEnum<'ctx>> {
self.set_source_location(expression.location);
use ast::ExpressionType::*;
match &expression.node {
Identifier { name } => {
Ok(*self.namespace.get(name).unwrap())
ast::ExpressionType::Identifier { name } => {
match self.namespace.get(name) {
Some(value) => Ok(*value),
None => Err(self.compile_error(CompileErrorKind::UnboundIdentifier))
}
},
Binop { a, op, b } => {
ast::ExpressionType::Binop { a, op, b } => {
let a = self.compile_expression(&a)?;
let b = self.compile_expression(&b)?;
if a.get_type() != b.get_type() {