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Move to intepret_cs_action

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This commit is contained in:
Kai Luo 2023-01-09 23:18:06 +08:00
parent 8333e5cf5e
commit d4926eb8ab
1 changed files with 17 additions and 24 deletions
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41
library/std/src/personality/dwarf/eh.rs
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@ -95,17 +95,7 @@ pub unsafe fn find_eh_action(lsda: *const u8, context: &EHContext<'_>) -> Result
return Ok(EHAction::None);
} else {
let lpad = lpad_base + cs_lpad;
if cs_action_entry == 0 {
return Ok(interpret_cs_action(0, lpad));
} else {
let action_record =
(action_table as *mut u8).offset(cs_action_entry as isize - 1);
let mut action_reader = DwarfReader::new(action_record);
let ttype_index = action_reader.read_sleb128();
// Normally, if ttype_index < 0, meaning the catch type is exception specification.
// Since we only care about if ttype_index is zero, so casting ttype_index to u64 makes sense.
return Ok(interpret_cs_action(ttype_index as u64, lpad));
}
return Ok(interpret_cs_action(action_table as *mut u8, cs_action_entry, lpad));
}
}
}
@ -129,28 +119,31 @@ pub unsafe fn find_eh_action(lsda: *const u8, context: &EHContext<'_>) -> Result
// Can never have null landing pad for sjlj -- that would have
// been indicated by a -1 call site index.
let lpad = (cs_lpad + 1) as usize;
if cs_action_entry == 0 {
return Ok(interpret_cs_action(0, lpad));
} else {
let action_record =
(action_table as *mut u8).offset(cs_action_entry as isize - 1);
let mut action_reader = DwarfReader::new(action_record);
let ttype_index = action_reader.read_sleb128();
return Ok(interpret_cs_action(ttype_index as u64, lpad));
}
return Ok(interpret_cs_action(action_table as *mut u8, cs_action_entry, lpad));
}
}
}
}
fn interpret_cs_action(cs_action: u64, lpad: usize) -> EHAction {
if cs_action == 0 {
unsafe fn interpret_cs_action(
action_table: *mut u8,
cs_action_entry: u64,
lpad: usize,
) -> EHAction {
if cs_action_entry == 0 {
// If cs_action is 0 then this is a cleanup (Drop::drop). We run these
// for both Rust panics and foreign exceptions.
EHAction::Cleanup(lpad)
} else {
// Stop unwinding Rust panics at catch_unwind.
EHAction::Catch(lpad)
let action_record = (action_table as *mut u8).offset(cs_action_entry as isize - 1);
let mut action_reader = DwarfReader::new(action_record);
let ttype_index = action_reader.read_sleb128();
if ttype_index == 0 {
EHAction::Cleanup(lpad)
} else {
// Stop unwinding Rust panics at catch_unwind.
EHAction::Catch(lpad)
}
}
}