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a789af4162
If the personality is not a recognized MSVC personality function, this pass delegates to the dwarf EH preparation pass. This chaining supports people on *-windows-itanium or *-windows-gnu targets. Currently this recognizes some personalities used by MSVC and turns resume instructions into traps to avoid link errors. Even if cleanups are not used in the source program, LLVM requires the frontend to emit a code path that resumes unwinding after an exception. Clang does this, and we get unreachable resume instructions. PR20300 covers cleaning up these unreachable calls to resume. Reviewers: majnemer Differential Revision: http://reviews.llvm.org/D7216 llvm-svn: 227405
81 lines
2.0 KiB
LLVM
81 lines
2.0 KiB
LLVM
; RUN: opt -S -winehprepare -mtriple x86_64-pc-windows-msvc < %s | FileCheck %s
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; FIXME: Add and test outlining here.
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declare void @maybe_throw()
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@_ZTIi = external constant i8*
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@g = external global i32
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declare i32 @__C_specific_handler(...)
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declare i32 @__gxx_personality_seh0(...)
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declare i32 @llvm.eh.typeid.for(i8*) readnone nounwind
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define i32 @use_seh() {
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entry:
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invoke void @maybe_throw()
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to label %cont unwind label %lpad
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cont:
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ret i32 0
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lpad:
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%ehvals = landingpad { i8*, i32 } personality i32 (...)* @__C_specific_handler
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cleanup
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catch i8* bitcast (i32 (i8*, i8*)* @filt_g to i8*)
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%ehsel = extractvalue { i8*, i32 } %ehvals, 1
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%filt_g_sel = call i32 @llvm.eh.typeid.for(i8* bitcast (i32 (i8*, i8*)* @filt_g to i8*))
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%matches = icmp eq i32 %ehsel, %filt_g_sel
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br i1 %matches, label %ret1, label %eh.resume
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ret1:
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ret i32 1
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eh.resume:
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resume { i8*, i32 } %ehvals
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}
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define internal i32 @filt_g(i8*, i8*) {
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%g = load i32* @g
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ret i32 %g
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}
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; CHECK-LABEL: define i32 @use_seh()
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; CHECK: invoke void @maybe_throw()
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; CHECK-NEXT: to label %cont unwind label %lpad
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; CHECK: eh.resume:
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; CHECK-NEXT: unreachable
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; A MinGW64-ish EH style. It could happen if a binary uses both MSVC CRT and
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; mingw CRT and is linked with LTO.
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define i32 @use_gcc() {
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entry:
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invoke void @maybe_throw()
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to label %cont unwind label %lpad
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cont:
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ret i32 0
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lpad:
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%ehvals = landingpad { i8*, i32 } personality i32 (...)* @__gxx_personality_seh0
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cleanup
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catch i8* bitcast (i8** @_ZTIi to i8*)
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%ehsel = extractvalue { i8*, i32 } %ehvals, 1
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%filt_g_sel = call i32 @llvm.eh.typeid.for(i8* bitcast (i32 (i8*, i8*)* @filt_g to i8*))
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%matches = icmp eq i32 %ehsel, %filt_g_sel
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br i1 %matches, label %ret1, label %eh.resume
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ret1:
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ret i32 1
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eh.resume:
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resume { i8*, i32 } %ehvals
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}
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; CHECK-LABEL: define i32 @use_gcc()
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; CHECK: invoke void @maybe_throw()
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; CHECK-NEXT: to label %cont unwind label %lpad
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; CHECK: eh.resume:
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; CHECK: call void @_Unwind_Resume(i8* %exn.obj)
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