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Add some better docs

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This commit is contained in:
Lachlan Sneff
2019-03-13 14:58:44 -07:00
parent 20d1023abe
commit 3eaf5525d1
3 changed files with 52 additions and 10 deletions
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27
lib/runtime-core/src/backing.rs
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@ -17,30 +17,31 @@ use crate::{
};
use std::slice;
/// The `LocalBacking` "owns" the memory used by all the local resources.
/// That is, local memories, tables, and globals (as well as some additional
/// data for the virtual call machinery).
#[derive(Debug)]
pub struct LocalBacking {
/// This is a map from the local resource index to actual memory,
/// table, and globals.
pub(crate) memories: BoxedMap<LocalMemoryIndex, Memory>,
pub(crate) tables: BoxedMap<LocalTableIndex, Table>,
pub(crate) globals: BoxedMap<LocalGlobalIndex, Global>,
/// This own the memory containing the pointers to the local memories.
/// While simplifying implementation, this adds indirection and may hurt
/// performance, especially on cache-starved systems.
pub(crate) vm_memories: BoxedMap<LocalMemoryIndex, *mut vm::LocalMemory>,
pub(crate) vm_tables: BoxedMap<LocalTableIndex, *mut vm::LocalTable>,
pub(crate) vm_globals: BoxedMap<LocalGlobalIndex, *mut vm::LocalGlobal>,
/// The dynamic sigindices are used to efficiently support caching and
/// the `call_indirect` wasm instruction. This field (and local_functions
/// as well) are subject to change.
pub(crate) dynamic_sigindices: BoxedMap<SigIndex, vm::SigId>,
pub(crate) local_functions: BoxedMap<LocalFuncIndex, *const vm::Func>,
}
// impl LocalBacking {
// pub fn memory(&mut self, local_memory_index: LocalMemoryIndex) -> &mut Memory {
// &mut self.memories[local_memory_index]
// }
// pub fn table(&mut self, local_table_index: LocalTableIndex) -> &mut TableBacking {
// &mut self.tables[local_table_index]
// }
// }
impl LocalBacking {
pub(crate) fn new(module: &ModuleInner, imports: &ImportBacking, vmctx: *mut vm::Ctx) -> Self {
let mut memories = Self::generate_memories(module);
@ -102,6 +103,9 @@ impl LocalBacking {
memories.into_boxed_map()
}
/// Initialize each local memory.
///
/// This involves copying in the data initializers.
fn finalize_memories(
module: &ModuleInner,
imports: &ImportBacking,
@ -174,6 +178,9 @@ impl LocalBacking {
tables.into_boxed_map()
}
/// This initializes all of the local tables, e.g.
/// putting all the table elements (function pointers)
/// in the right places.
#[allow(clippy::cast_ptr_alignment)]
fn finalize_tables(
module: &ModuleInner,