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#![cfg_attr(nightly, feature(unwind_attributes))]

#[cfg(test)]
#[macro_use]
extern crate field_offset;

#[macro_use]
extern crate serde_derive;

#[macro_use]
mod macros;
#[doc(hidden)]
pub mod backend;
mod backing;

pub mod cache;
pub mod codegen;
pub mod error;
pub mod export;
pub mod global;
pub mod import;
pub mod instance;
pub mod memory;
pub mod module;
pub mod parse;
mod sig_registry;
pub mod structures;
mod sys;
pub mod table;
pub mod typed_func;
pub mod types;
pub mod units;
pub mod vm;
#[doc(hidden)]
pub mod vmcalls;

use self::error::CompileResult;
#[doc(inline)]
pub use self::error::Result;
#[doc(inline)]
pub use self::import::IsExport;
#[doc(inline)]
pub use self::instance::{DynFunc, Instance};
#[doc(inline)]
pub use self::module::Module;
#[doc(inline)]
pub use self::typed_func::Func;
use std::sync::Arc;

use self::cache::{Artifact, Error as CacheError};

pub mod prelude {
    pub use crate::import::{ImportObject, Namespace};
    pub use crate::types::{
        FuncIndex, GlobalIndex, ImportedFuncIndex, ImportedGlobalIndex, ImportedMemoryIndex,
        ImportedTableIndex, LocalFuncIndex, LocalGlobalIndex, LocalMemoryIndex, LocalTableIndex,
        MemoryIndex, TableIndex, Type, Value,
    };
    pub use crate::vm;
    pub use crate::{func, imports};
}

/// Compile a [`Module`] using the provided compiler from
/// WebAssembly binary code. This function is useful if it
/// is necessary to a compile a module before it can be instantiated
/// and must be used if you wish to use a different backend from the default.
///
/// [`Module`]: struct.Module.html
pub fn compile_with(
    wasm: &[u8],
    compiler: &dyn backend::Compiler,
) -> CompileResult<module::Module> {
    let token = backend::Token::generate();
    compiler
        .compile(wasm, Default::default(), token)
        .map(|mut inner| {
            let inner_info: &mut crate::module::ModuleInfo = &mut inner.info;
            inner_info.import_custom_sections(wasm).unwrap();
            module::Module::new(Arc::new(inner))
        })
}

/// The same as `compile_with` but changes the compiler behavior
/// with the values in the `CompilerConfig`
pub fn compile_with_config(
    wasm: &[u8],
    compiler: &dyn backend::Compiler,
    compiler_config: backend::CompilerConfig,
) -> CompileResult<module::Module> {
    let token = backend::Token::generate();
    compiler
        .compile(wasm, compiler_config, token)
        .map(|inner| module::Module::new(Arc::new(inner)))
}

/// Perform validation as defined by the
/// WebAssembly specification. Returns `true` if validation
/// succeeded, `false` if validation failed.
pub fn validate(wasm: &[u8]) -> bool {
    validate_and_report_errors(wasm).is_ok()
}

/// The same as `validate` but with an Error message on failure
pub fn validate_and_report_errors(wasm: &[u8]) -> ::std::result::Result<(), String> {
    use wasmparser::WasmDecoder;
    let mut parser = wasmparser::ValidatingParser::new(wasm, None);
    loop {
        let state = parser.read();
        match *state {
            wasmparser::ParserState::EndWasm => break Ok(()),
            wasmparser::ParserState::Error(e) => break Err(format!("{}", e)),
            _ => {}
        }
    }
}

pub unsafe fn load_cache_with(
    cache: Artifact,
    compiler: &dyn backend::Compiler,
) -> std::result::Result<module::Module, CacheError> {
    let token = backend::Token::generate();
    compiler
        .from_cache(cache, token)
        .map(|inner| module::Module::new(Arc::new(inner)))
}

/// The current version of this crate
pub const VERSION: &str = env!("CARGO_PKG_VERSION");