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new runtime module

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This commit is contained in:
Lachlan Sneff
2018-12-24 17:25:17 -05:00
parent 5b920b7953
commit 93ef1e4220
13 changed files with 646 additions and 230 deletions
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13
src/webassembly/instance.rs
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@ -30,7 +30,7 @@ use super::memory::LinearMemory;
use super::module::{Export, ImportableExportable, Module};
use super::relocation::{Reloc, RelocSink, RelocationType};
use super::vm;
use super::backing::{Backing, ImportsBacking};
use super::backing::{LocalBacking, ImportsBacking};
type TablesSlice = UncheckedSlice<BoundedSlice<usize>>;
// TODO: this should be `type MemoriesSlice = UncheckedSlice<UncheckedSlice<u8>>;`, but that crashes for some reason.
@ -96,13 +96,14 @@ pub enum InstanceABI {
#[derive(Debug)]
#[repr(C)]
pub struct Instance {
pub vmctx: vm::Ctx,
// C-like pointers to data (heaps, globals, tables)
pub data_pointers: DataPointers,
/// Webassembly functions
finalized_funcs: Box<[*const vm::Func]>,
backing: Backing,
backing: LocalBacking,
imports: ImportsBacking,
@ -113,6 +114,14 @@ pub struct Instance {
pub emscripten_data: Option<EmscriptenData>,
}
impl Instance {
/// Shortcut for converting from a `vm::Ctx` pointer to a reference to the `Instance`.
/// This works because of the `vm::Ctx` is the first field of the `Instance`.
pub unsafe fn from_vmctx<'a>(ctx: *mut vm::Ctx) -> &'a mut Instance {
&mut *(ctx as *mut Instance)
}
}
/// Contains pointers to data (heaps, globals, tables) needed
/// by Cranelift.
/// NOTE: Rearranging the fields will break the memory arrangement model