| /* Copyright 2018 Mozilla Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| use crate::{BinaryReader, ConstExpr, FromReader, GlobalType, Result, SectionLimited}; |
| |
| /// Represents a core WebAssembly global. |
| #[derive(Debug, Copy, Clone)] |
| pub struct Global<'a> { |
| /// The global's type. |
| pub ty: GlobalType, |
| /// The global's initialization expression. |
| pub init_expr: ConstExpr<'a>, |
| } |
| |
| /// A reader for the global section of a WebAssembly module. |
| pub type GlobalSectionReader<'a> = SectionLimited<'a, Global<'a>>; |
| |
| impl<'a> FromReader<'a> for Global<'a> { |
| fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> { |
| let ty = reader.read()?; |
| let init_expr = reader.read()?; |
| Ok(Global { ty, init_expr }) |
| } |
| } |
| |
| impl<'a> FromReader<'a> for GlobalType { |
| fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> { |
| Ok(GlobalType { |
| content_type: reader.read()?, |
| mutable: match reader.read_u8()? { |
| 0x00 => false, |
| 0x01 => true, |
| _ => bail!(reader.original_position() - 1, "malformed mutability",), |
| }, |
| }) |
| } |
| } |