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[AArch64] [MinGW] Allow enabling SEH exceptions

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The default still is dwarf, but SEH exceptions can now be enabled
optionally for the MinGW target.

Differential Revision: https://reviews.llvm.org/D55748

llvm-svn: 349451
This commit is contained in:
Martin Storsjo 2018-12-18 08:32:37 +00:00
parent 3ac6aab0f4
commit c2b513c47d
3 changed files with 52 additions and 1 deletions
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2
lib/MC/MCObjectFileInfo.cpp
View File

@ -510,7 +510,7 @@ void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
SectionKind::getReadOnly());
if (T.getArch() == Triple::x86_64) {
if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64) {
// On Windows 64 with SEH, the LSDA is emitted into the .xdata section
LSDASection = nullptr;
} else {

3
lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp
View File

@ -132,4 +132,7 @@ AArch64MCAsmInfoGNUCOFF::AArch64MCAsmInfoGNUCOFF() {
CommentString = "//";
ExceptionsType = ExceptionHandling::DwarfCFI;
// The default is dwarf, but WinEH can be enabled optionally, which requires
// WinEHEncodingType to be set.
WinEHEncodingType = WinEH::EncodingType::Itanium;
}

48
test/CodeGen/AArch64/wineh-mingw.ll Normal file
View File

@ -0,0 +1,48 @@
; RUN: llc < %s -exception-model=wineh -mtriple=aarch64-pc-mingw32 | FileCheck %s -check-prefix=WINEH
; RUN: llc < %s -exception-model=wineh -mtriple=aarch64-pc-mingw32 -filetype=obj | llvm-readobj -s | FileCheck %s -check-prefix=WINEH-SECTIONS
; Check emission of eh handler and handler data
declare i32 @_d_eh_personality(i32, i32, i64, i8*, i8*)
declare void @_d_eh_resume_unwind(i8*)
declare i32 @bar()
define i32 @foo4() #0 personality i32 (i32, i32, i64, i8*, i8*)* @_d_eh_personality {
entry:
%step = alloca i32, align 4
store i32 0, i32* %step
%tmp = load i32, i32* %step
%tmp1 = invoke i32 @bar()
to label %finally unwind label %landingpad
finally:
store i32 1, i32* %step
br label %endtryfinally
landingpad:
%landing_pad = landingpad { i8*, i32 }
cleanup
%tmp3 = extractvalue { i8*, i32 } %landing_pad, 0
store i32 2, i32* %step
call void @_d_eh_resume_unwind(i8* %tmp3)
unreachable
endtryfinally:
%tmp10 = load i32, i32* %step
ret i32 %tmp10
}
; WINEH-LABEL: foo4:
; WINEH: .seh_proc foo4
; WINEH: .seh_handler _d_eh_personality, @unwind, @except
; WINEH: ret
; WINEH: .section .xdata,"dr"
; WINEH-NEXT: .seh_handlerdata
; WINEH-NEXT: .text
; WINEH-NEXT: .seh_endproc
; WINEH: .section .xdata,"dr"
; WINEH-NEXT: .p2align 2
; WINEH-NEXT: GCC_except_table0:
; WINEH-SECTIONS: Name: .xdata
; WINEH-SECTIONS-NOT: Name: .gcc_except_table