[llvm-dev] Windows "0xC00001A5: An invalid exception handler routine has been detected" with LLVM win32 (i386) SEH code

[Carlo Kok via llvm-dev]

Hi,

I'm getting:

Unhandled exception at 0x00C211F0 in ConsoleApplication830.exe: 0xC00001A5: An invalid exception handler routine has been detected (parameters: 0x00000001).

With some fairly simple SEH enabled routine:

define i32 @__elements_entry_point_main(%._gt2a_RemObjects_d_Elements_d_System_d_Array_t_1s*) #0 personality i8* bitcast (i32 ()* @_elements_exception_handler to i8*) !dbg !61 {
BasicBlock0:
  %1 = alloca %._gt2a_RemObjects_d_Elements_d_System_d_Array_t_1s*
  store %._gt2a_RemObjects_d_Elements_d_System_d_Array_t_1s* %0, %._gt2a_RemObjects_d_Elements_d_System_d_Array_t_1s** %1
  call void @llvm.dbg.declare(metadata %._gt2a_RemObjects_d_Elements_d_System_d_Array_t_1s** %1, metadata !86, metadata !DIExpression()), !dbg !88
  %csLoc0 = alloca i32, !dbg !88
  store i32 0, i32* %csLoc0, !dbg !88
  br label %BasicBlock1, !dbg !88

BasicBlock1:                                      ; preds = %BasicBlock0
  call void @llvm.dbg.declare(metadata i32* %csLoc0, metadata !89, metadata !DIExpression()), !dbg !91
  store i32 0, i32* %csLoc0, !dbg !91
  invoke void @ms_t1d_ConsoleApplication4_d_Program2_m1()
          to label %BasicBlock2 unwind label %2, !dbg !92

BasicBlock2:                                      ; preds = %BasicBlock1
  br label %BasicBlock3, !dbg !93

; <label>:2:                                      ; preds = %BasicBlock1
  %3 = catchswitch within none [label %BasicBlock4] unwind to caller, !dbg !93

BasicBlock3:                                      ; preds = %BasicBlock5, %BasicBlock2
  %4 = load i32, i32* %csLoc0, !dbg !94
  ret i32 %4, !dbg !94

BasicBlock4:                                      ; preds = %2
  %5 = catchpad within %3 [{ i8*, i8* }* @0, i32 0, i8* null], !dbg !93
  catchret from %5 to label %BasicBlock5, !dbg !95

BasicBlock5:                                      ; preds = %BasicBlock4
  br label %BasicBlock3, !dbg !95

BasicBlock6:                                      ; No predecessors!
  unreachable, !dbg !94
}


(_elements_exception_handler  is my exception handler routine which I added to the LLVM source, compatible with the standard VC++ one). My question is,

is there something special I need to do to make SEH work (I'm using LLVM LLD to compile it, from 3 months ago, but latest doesn't give a different result)? I can't find anything real about that exception code.

0x00C211F0  DOES point to the generated code used for SEH:

00C211F0 | 57                       | push edi                                                   |
00C211F1 | 56                       | push esi                                                   |
00C211F2 | 83EC 10                  | sub esp,10                                                 |
00C211F5 | 8B4424 28                | mov eax,dword ptr ss:[esp+28]                              |
00C211F9 | 8B4C24 24                | mov ecx,dword ptr ss:[esp+24]                              |
00C211FD | 8B5424 20                | mov edx,dword ptr ss:[esp+20]                              |
00C21201 | 8B7424 1C                | mov esi,dword ptr ss:[esp+1C]                              |
00C21205 | BF 54DCC800              | mov edi,consoleapplication830.C8DC54                       |
00C2120A | 894424 0C                | mov dword ptr ss:[esp+C],eax                               |
00C2120E | 89F8                     | mov eax,edi                                                |
00C21210 | 897424 08                | mov dword ptr ss:[esp+8],esi                               |
00C21214 | 894C24 04                | mov dword ptr ss:[esp+4],ecx                               |
00C21218 | 891424                   | mov dword ptr ss:[esp],edx                                 |
00C2121B | 83C4 10                  | add esp,10                                                 |
00C2121E | 5E                       | pop esi                                                    |
00C2121F | 5F                       | pop edi                                                    |
00C21220 | E9 7B270100              | jmp <consoleapplication830.RemObjects.Elements.System.Exte |

Which seems fine.