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llvm-project/llvm/test/CodeGen/WinEH/wineh-setjmp.ll

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[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 llvm-svn: 262241
2016-03-01 03:16:03 +08:00
; 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 }