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Added resolve_vmctx_memory function to enable debuggers to resolve sandbox pointers - required because sandbox 'this' pointer cannot be resolved by lldb any other way as lldb expects "this" and "self" to be standard pointers, not sandbox handles.

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Steve
2021-10-11 09:08:14 +01:00
parent 2fcce7129c
commit 92a10d1ace
1 changed files with 14 additions and 0 deletions
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14
crates/runtime/src/debug_builtins.rs
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@@ -6,6 +6,19 @@ use wasmtime_environ::{EntityRef, MemoryIndex};
static mut VMCTX_AND_MEMORY: (*mut VMContext, usize) = (std::ptr::null_mut(), 0);
#[no_mangle]
pub unsafe extern "C" fn resolve_vmctx_memory(ptr: usize) -> *const u8 {
let handle = InstanceHandle::from_vmctx(VMCTX_AND_MEMORY.0);
assert!(
VMCTX_AND_MEMORY.1 < handle.module().memory_plans.len(),
"memory index for debugger is out of bounds"
);
let index = MemoryIndex::new(VMCTX_AND_MEMORY.1);
let mem = handle.instance().get_memory(index);
mem.base.add(ptr)
}
#[no_mangle]
pub unsafe extern "C" fn resolve_vmctx_memory_ptr(p: *const u32) -> *const u8 {
let ptr = std::ptr::read(p);
@@ -36,5 +49,6 @@ pub fn ensure_exported() {
unsafe {
std::ptr::read_volatile(resolve_vmctx_memory_ptr as *const u8);
std::ptr::read_volatile(set_vmctx_memory as *const u8);
std::ptr::read_volatile(resolve_vmctx_memory as *const u8);
}
}