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implement numerical casts

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This commit is contained in:
Sebastien Bourdeauducq 2020-03-30 12:01:12 +08:00
parent ea699fb46f
commit 056b9631a0
1 changed files with 59 additions and 0 deletions
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59
src/main.rs
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@ -288,6 +288,65 @@ impl<'ctx> CodeGen<'ctx> {
}
}
},
ast::ExpressionType::Call { function, args, keywords } => {
if !keywords.is_empty() {
return Err(self.compile_error(CompileErrorKind::Unsupported("keyword arguments")))
}
let args = args.iter().map(|val| self.compile_expression(val))
.collect::<CompileResult<Vec<values::BasicValueEnum>>>()?;
self.set_source_location(expression.location);
if let ast::ExpressionType::Identifier { name } = &function.node {
match (name.as_str(), args[0]) {
("int32", values::BasicValueEnum::IntValue(a)) => {
let nbits = a.get_type().get_bit_width();
if nbits < 32 {
Ok(self.builder.build_int_s_extend(a, self.context.i32_type(), "tmpsext").into())
} else if nbits > 32 {
Ok(self.builder.build_int_truncate(a, self.context.i32_type(), "tmptrunc").into())
} else {
Ok(a.into())
}
},
("int64", values::BasicValueEnum::IntValue(a)) => {
let nbits = a.get_type().get_bit_width();
if nbits < 64 {
Ok(self.builder.build_int_s_extend(a, self.context.i64_type(), "tmpsext").into())
} else {
Ok(a.into())
}
},
("int32", values::BasicValueEnum::FloatValue(a)) => {
Ok(self.builder.build_float_to_signed_int(a, self.context.i32_type(), "tmpfptosi").into())
},
("int64", values::BasicValueEnum::FloatValue(a)) => {
Ok(self.builder.build_float_to_signed_int(a, self.context.i64_type(), "tmpfptosi").into())
},
("float32", values::BasicValueEnum::IntValue(a)) => {
Ok(self.builder.build_signed_int_to_float(a, self.context.f32_type(), "tmpsitofp").into())
},
("float64", values::BasicValueEnum::IntValue(a)) => {
Ok(self.builder.build_signed_int_to_float(a, self.context.f64_type(), "tmpsitofp").into())
},
("float32", values::BasicValueEnum::FloatValue(a)) => {
if a.get_type() == self.context.f64_type() {
Ok(self.builder.build_float_trunc(a, self.context.f32_type(), "tmptrunc").into())
} else {
Ok(a.into())
}
},
("float64", values::BasicValueEnum::FloatValue(a)) => {
if a.get_type() == self.context.f32_type() {
Ok(self.builder.build_float_ext(a, self.context.f64_type(), "tmpext").into())
} else {
Ok(a.into())
}
},
_ => Err(self.compile_error(CompileErrorKind::Unsupported("unrecognized call")))
}
} else {
return Err(self.compile_error(CompileErrorKind::Unsupported("function must be an identifier")))
}
},
_ => return Err(self.compile_error(CompileErrorKind::Unsupported("unimplemented expression"))),
}
}