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Merge commit '370c397ec9' into sync_cg_clif-2022-03-20

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This commit is contained in:
bjorn3 2022-03-20 16:55:21 +01:00
commit ef4ce72919
32 changed files with 462 additions and 515 deletions
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13
compiler/rustc_codegen_cranelift/src/debuginfo/unwind.rs
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@ -81,6 +81,8 @@ impl UnwindContext {
#[cfg(all(feature = "jit", not(windows)))]
pub(crate) unsafe fn register_jit(self, jit_module: &cranelift_jit::JITModule) {
use std::mem::ManuallyDrop;
let mut eh_frame = EhFrame::from(super::emit::WriterRelocate::new(self.endian));
self.frame_table.write_eh_frame(&mut eh_frame).unwrap();
@ -95,17 +97,16 @@ impl UnwindContext {
// FIXME support unregistering unwind tables once cranelift-jit supports deallocating
// individual functions
#[allow(unused_variables)]
let (eh_frame, eh_frame_len, _) = Vec::into_raw_parts(eh_frame);
let eh_frame = ManuallyDrop::new(eh_frame);
// =======================================================================
// Everything after this line up to the end of the file is loosly based on
// Everything after this line up to the end of the file is loosely based on
// https://github.com/bytecodealliance/wasmtime/blob/4471a82b0c540ff48960eca6757ccce5b1b5c3e4/crates/jit/src/unwind/systemv.rs
#[cfg(target_os = "macos")]
{
// On macOS, `__register_frame` takes a pointer to a single FDE
let start = eh_frame;
let end = start.add(eh_frame_len);
let start = eh_frame.as_ptr();
let end = start.add(eh_frame.len());
let mut current = start;
// Walk all of the entries in the frame table and register them
@ -124,7 +125,7 @@ impl UnwindContext {
#[cfg(not(target_os = "macos"))]
{
// On other platforms, `__register_frame` will walk the FDEs until an entry of length 0
__register_frame(eh_frame);
__register_frame(eh_frame.as_ptr());
}
}
}