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cranelift: refactor unwind logic to accommodate multiple backends (#2357)

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*    Make cranelift_codegen::isa::unwind::input public
*    Move UnwindCode's common offset field out of the structure
*    Make MachCompileResult::unwind_info more generic
*    Record initial stack pointer offset
This commit is contained in:
Yury Delendik
2020-11-05 16:57:40 -06:00
committed by GitHub
parent df59ffb1b6
commit f60c0f3ec3
15 changed files with 396 additions and 351 deletions
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17
cranelift/codegen/src/context.rs
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@@ -253,13 +253,16 @@ impl Context {
&self,
isa: &dyn TargetIsa,
) -> CodegenResult<Option<crate::isa::unwind::UnwindInfo>> {
if self.mach_compile_result.is_some() {
return Ok(self
.mach_compile_result
.as_ref()
.unwrap()
.unwind_info
.clone());
if let Some(backend) = isa.get_mach_backend() {
use crate::isa::CallConv;
use crate::machinst::UnwindInfoKind;
let unwind_info_kind = match self.func.signature.call_conv {
CallConv::Fast | CallConv::Cold | CallConv::SystemV => UnwindInfoKind::SystemV,
CallConv::WindowsFastcall => UnwindInfoKind::Windows,
_ => UnwindInfoKind::None,
};
let result = self.mach_compile_result.as_ref().unwrap();
return backend.emit_unwind_info(result, unwind_info_kind);
}
isa.create_unwind_info(&self.func)
}