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Explain flag value of 8 for msvc_try

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This commit is contained in:
Amanieu d'Antras 2020-01-01 22:24:39 +01:00
parent 838e3874fc
commit ed217a53ff
1 changed files with 5 additions and 1 deletions
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6
src/librustc_codegen_llvm/intrinsic.rs
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@ -952,11 +952,15 @@ fn codegen_msvc_try(
let cs = catchswitch.catch_switch(None, None, 1);
catchswitch.add_handler(cs, catchpad.llbb());
// The flag value of 8 indicates that we are catching the exception by
// reference instead of by value.
//
// Source: MicrosoftCXXABI::getAddrOfCXXCatchHandlerType in clang
let flags = bx.const_i32(8);
let tydesc = match bx.tcx().lang_items().eh_catch_typeinfo() {
Some(did) => bx.get_static(did),
None => bug!("eh_catch_typeinfo not defined, but needed for SEH unwinding"),
};
let flags = bx.const_i32(8); // Catch by reference
let funclet = catchpad.catch_pad(cs, &[tydesc, flags, slot]);
let i64_align = bx.tcx().data_layout.i64_align.abi;