[AArch64] [MinGW] Allow enabling SEH exceptions

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

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349451 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/MC/MCObjectFileInfo.cpp b/lib/MC/MCObjectFileInfo.cpp
index be671af1768fa9e4b584e25fdd5851bdcff97457..9e35355d06e0a50e4825fd1f927a6e13b266012c 100644 (file)
--- a/lib/MC/MCObjectFileInfo.cpp
+++ b/lib/MC/MCObjectFileInfo.cpp
@@ -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 {

diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp b/lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp
index 0e486b9392316a78688c597bcbed616f34b94d54..58e4a9c9a9e9aa7bdc5a0a6b070ed57750acd63f 100644 (file)
--- a/lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp
+++ b/lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp
@@ -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;
 }

diff --git a/test/CodeGen/AArch64/wineh-mingw.ll b/test/CodeGen/AArch64/wineh-mingw.ll
new file mode 100644 (file)
index 0000000..ae26b06
--- /dev/null
+++ b/test/CodeGen/AArch64/wineh-mingw.ll
@@ -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