c91e14d83f
This commit updates the implementation of `VMOffsets` to frontload all checked arithmetic on construction of the `VMOffsets` which allows eliding all checked arithmetic when accessing the fields of `VMOffsets`. For testing and such this adds a new constructor as well from a new `VMOffsetsFields` structure which is a clone of the old definition. This should help speed up some profile hot spots I've been seeing where with all the checked arithmetic on field sizes this was slowing down the various accessors during instantiation (which uses `VMOffsets` to initialize various fields of the `VMContext`).
90 lines
2.9 KiB
Rust
90 lines
2.9 KiB
Rust
//! Standalone environment for WebAssembly using Cranelift. Provides functions to translate
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//! `get_global`, `set_global`, `memory.size`, `memory.grow`, `call_indirect` that hardcode in
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//! the translation the base addresses of regions of memory that will hold the globals, tables and
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//! linear memories.
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#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
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#![warn(unused_import_braces)]
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#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
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#![cfg_attr(
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feature = "cargo-clippy",
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allow(clippy::new_without_default, clippy::new_without_default)
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)]
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#![cfg_attr(
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feature = "cargo-clippy",
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warn(
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clippy::float_arithmetic,
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clippy::mut_mut,
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clippy::nonminimal_bool,
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clippy::map_unwrap_or,
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clippy::clippy::print_stdout,
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clippy::unicode_not_nfc,
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clippy::use_self
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)
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)]
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mod address_map;
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mod builtin;
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mod compilation;
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mod data_structures;
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mod module;
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mod module_environ;
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mod tunables;
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mod vmoffsets;
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pub use crate::address_map::*;
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pub use crate::builtin::*;
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pub use crate::compilation::*;
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pub use crate::data_structures::*;
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pub use crate::module::*;
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pub use crate::module_environ::*;
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pub use crate::tunables::Tunables;
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pub use crate::vmoffsets::*;
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/// WebAssembly page sizes are defined to be 64KiB.
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pub const WASM_PAGE_SIZE: u32 = 0x10000;
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/// The number of pages we can have before we run out of byte index space.
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pub const WASM_MAX_PAGES: u32 = 0x10000;
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/// Version number of this crate.
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pub const VERSION: &str = env!("CARGO_PKG_VERSION");
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/// Returns the reference type to use for the provided wasm type.
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pub fn reference_type(wasm_ty: cranelift_wasm::WasmType, pointer_type: ir::Type) -> ir::Type {
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match wasm_ty {
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cranelift_wasm::WasmType::FuncRef => pointer_type,
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cranelift_wasm::WasmType::ExternRef => match pointer_type {
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ir::types::I32 => ir::types::R32,
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ir::types::I64 => ir::types::R64,
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_ => panic!("unsupported pointer type"),
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},
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_ => panic!("unsupported Wasm reference type"),
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}
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}
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/// Iterates through all `LibCall` members and all runtime exported functions.
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#[macro_export]
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macro_rules! for_each_libcall {
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($op:ident) => {
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$op![
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(UdivI64, wasmtime_i64_udiv),
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(UdivI64, wasmtime_i64_udiv),
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(SdivI64, wasmtime_i64_sdiv),
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(UremI64, wasmtime_i64_urem),
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(SremI64, wasmtime_i64_srem),
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(IshlI64, wasmtime_i64_ishl),
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(UshrI64, wasmtime_i64_ushr),
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(SshrI64, wasmtime_i64_sshr),
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(CeilF32, wasmtime_f32_ceil),
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(FloorF32, wasmtime_f32_floor),
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(TruncF32, wasmtime_f32_trunc),
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(NearestF32, wasmtime_f32_nearest),
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(CeilF64, wasmtime_f64_ceil),
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(FloorF64, wasmtime_f64_floor),
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(TruncF64, wasmtime_f64_trunc),
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(NearestF64, wasmtime_f64_nearest)
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];
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};
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}
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