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author | David Majnemer <david.majnemer@gmail.com> | 2016-02-29 19:16:03 +0000 |
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committer | David Majnemer <david.majnemer@gmail.com> | 2016-02-29 19:16:03 +0000 |
commit | ace061bc345e3f8c6a9a5d4ba4a9b4f0c0f8d438 (patch) | |
tree | 79350bd17ea148447671131388caa325ff689328 /test/CodeGen/WinEH/wineh-setjmp.ll | |
parent | eb295ed84e45e32ca02ffe8d18036b50092e42e6 (diff) |
[WinEH] Make setjmp work correctly with EH
32-bit X86 EH on Windows utilizes a stack of registration nodes
allocated and deallocated on entry/exit. A registration node contains a
bunch of EH personality specific information like which try-state we are
currently in.
Because a setjmp target allows control flow from arbitrary program
points, there is no way to ensure that the try-state we are in is
correctly updated once we transfer control.
MSVC compatible compilers, like MSVC and ICC, utilize runtime helpers to
reinitialize the try-state when a longjmp occurs. This is implemented
by adding additional arguments to _setjmp3: the desired try-state and
a helper routine to update the try-state.
Differential Revision: http://reviews.llvm.org/D17721
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262241 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/WinEH/wineh-setjmp.ll')
-rw-r--r-- | test/CodeGen/WinEH/wineh-setjmp.ll | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/test/CodeGen/WinEH/wineh-setjmp.ll b/test/CodeGen/WinEH/wineh-setjmp.ll new file mode 100644 index 00000000000..bf459d98bde --- /dev/null +++ b/test/CodeGen/WinEH/wineh-setjmp.ll @@ -0,0 +1,75 @@ +; RUN: opt -mtriple=i686-pc-windows-msvc -S -x86-winehstate < %s | FileCheck %s +target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32" +target triple = "i686-pc-windows-msvc" + +@jb = external global i8 + +define i32 @test1() personality i32 (...)* @__CxxFrameHandler3 { +entry: +; CHECK-LABEL: define i32 @test1( +; CHECK: %[[eh_reg:.*]] = alloca +; CHECK: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}} %[[eh_reg]], i32 0, i32 2 +; CHECK: store i32 -1, i32* %[[gep]] +; CHECK: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}} %[[eh_reg]], i32 0, i32 2 +; CHECK: store i32 0, i32* %[[gep]] +; CHECK: %[[lsda:.*]] = call i8* @llvm.x86.seh.lsda(i8* bitcast (i32 ()* @test1 to i8*)) +; CHECK: invoke i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 3, void (i8*)* @__CxxLongjmpUnwind, i32 0, i8* %[[lsda]]) + %inv = invoke i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 0) #2 + to label %invoke.cont unwind label %ehcleanup + +invoke.cont: +; CHECK: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}} %[[eh_reg]], i32 0, i32 2 +; CHECK: store i32 -1, i32* %[[gep]] +; CHECK: %[[lsda:.*]] = call i8* @llvm.x86.seh.lsda(i8* bitcast (i32 ()* @test1 to i8*)) +; CHECK: call i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 3, void (i8*)* @__CxxLongjmpUnwind, i32 -1, i8* %[[lsda]]) + call i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 0) + call void @cleanup() + ret i32 %inv + +ehcleanup: + %cp = cleanuppad within none [] +; CHECK: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}} %[[eh_reg]], i32 0, i32 2 +; CHECK: %[[load:.*]] = load i32, i32* %[[gep]] +; CHECK: %[[lsda:.*]] = call i8* @llvm.x86.seh.lsda(i8* bitcast (i32 ()* @test1 to i8*)) +; CHECK: call i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 3, void (i8*)* @__CxxLongjmpUnwind, i32 %[[load]], i8* %[[lsda]]) [ "funclet"(token %cp) ] + %cal = call i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 0) [ "funclet"(token %cp) ] + call void @cleanup() [ "funclet"(token %cp) ] + cleanupret from %cp unwind to caller +} + +define i32 @test2() personality i32 (...)* @_except_handler3 { +entry: +; CHECK-LABEL: define i32 @test2( +; CHECK: %[[eh_reg:.*]] = alloca +; CHECK: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}} %[[eh_reg]], i32 0, i32 4 +; CHECK: store i32 -1, i32* %[[gep]] +; CHECK: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}} %[[eh_reg]], i32 0, i32 4 +; CHECK: store i32 0, i32* %[[gep]] +; CHECK: invoke i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 2, void (i8*)* @_seh_longjmp_unwind, i32 0) + %inv = invoke i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 0) #2 + to label %invoke.cont unwind label %ehcleanup + +invoke.cont: +; CHECK: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}} %[[eh_reg]], i32 0, i32 4 +; CHECK: store i32 -1, i32* %[[gep]] +; CHECK: call i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 2, void (i8*)* @_seh_longjmp_unwind, i32 -1) + call i32 (i8*, i32, ...) @_setjmp3(i8* @jb, i32 0) + call void @cleanup() + ret i32 %inv + +ehcleanup: + %cp = cleanuppad within none [] + call void @cleanup() [ "funclet"(token %cp) ] + cleanupret from %cp unwind to caller +} + +; Function Attrs: returns_twice +declare i32 @_setjmp3(i8*, i32, ...) #2 + +declare i32 @__CxxFrameHandler3(...) + +declare i32 @_except_handler3(...) + +declare void @cleanup() + +attributes #2 = { returns_twice } |