seh-stack-realign.ll
3.19 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
; RUN: llc -stack-symbol-ordering=0 -mtriple=i686-windows-msvc < %s | FileCheck %s
; 32-bit catch-all has to use a filter function because that's how it saves the
; exception code.
@str = linkonce_odr unnamed_addr constant [27 x i8] c"GetExceptionCode(): 0x%lx\0A\00", align 1
declare i32 @_except_handler3(...)
declare void @crash()
declare i32 @printf(i8* nocapture readonly, ...) nounwind
declare i32 @llvm.eh.typeid.for(i8*)
declare i8* @llvm.frameaddress(i32)
declare i8* @llvm.localrecover(i8*, i8*, i32)
declare void @llvm.localescape(...)
declare i8* @llvm.eh.recoverfp(i8*, i8*)
define i32 @main() personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
; The EH code allocation is overaligned, triggering realignment.
%__exceptioncode = alloca i32, align 8
call void (...) @llvm.localescape(i32* %__exceptioncode)
invoke void @crash() #5
to label %__try.cont unwind label %lpad
lpad: ; preds = %entry
%cs1 = catchswitch within none [label %__except] unwind to caller
__except: ; preds = %lpad
%p = catchpad within %cs1 [i8* bitcast (i32 ()* @"filt$main" to i8*)]
%code = load i32, i32* %__exceptioncode, align 4
%call = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @str, i32 0, i32 0), i32 %code) #4 [ "funclet"(token %p) ]
catchret from %p to label %__try.cont
__try.cont: ; preds = %entry, %__except
ret i32 0
}
define internal i32 @"filt$main"() {
entry:
%ebp = tail call i8* @llvm.frameaddress(i32 1)
%parentfp = tail call i8* @llvm.eh.recoverfp(i8* bitcast (i32 ()* @main to i8*), i8* %ebp)
%code.i8 = tail call i8* @llvm.localrecover(i8* bitcast (i32 ()* @main to i8*), i8* %parentfp, i32 0)
%__exceptioncode = bitcast i8* %code.i8 to i32*
%info.addr = getelementptr inbounds i8, i8* %ebp, i32 -20
%0 = bitcast i8* %info.addr to i32***
%1 = load i32**, i32*** %0, align 4
%2 = load i32*, i32** %1, align 4
%3 = load i32, i32* %2, align 4
store i32 %3, i32* %__exceptioncode, align 4
ret i32 1
}
; Check that we can get the exception code from eax to the printf.
; CHECK-LABEL: _main:
; CHECK: .set Lmain$frame_escape_0, [[code_offs:[-0-9]+]]
; CHECK: movl %esp, [[reg_offs:[-0-9]+]](%esi)
; CHECK: movl $L__ehtable$main,
; EH state 0
; CHECK: movl $0, 32(%esi)
; CHECK: calll _crash
; CHECK: retl
; CHECK: LBB0_[[lpbb:[0-9]+]]: # %__except
; Restore ESP
; CHECK: movl -24(%ebp), %esp
; Restore ESI
; CHECK: leal -36(%ebp), %esi
; Restore EBP
; CHECK: movl 4(%esi), %ebp
; CHECK: movl [[code_offs]](%esi), %[[code:[a-z]+]]
; CHECK: pushl %[[code]]
; CHECK: pushl $_str
; CHECK: calll _printf
; CHECK: .section .xdata,"dr"
; CHECK: .set Lmain$parent_frame_offset, [[reg_offs]]
; CHECK: L__ehtable$main
; CHECK-NEXT: .long -1
; CHECK-NEXT: .long _filt$main
; CHECK-NEXT: .long LBB0_[[lpbb]]
; CHECK-LABEL: _filt$main:
; CHECK: pushl %ebp
; CHECK: movl %esp, %ebp
; CHECK: movl (%ebp), %[[oldebp:[a-z]+]]
; CHECK: movl -20(%[[oldebp]]), %[[ehinfo:[a-z]+]]
; CHECK: movl (%[[ehinfo]]), %[[ehrec:[a-z]+]]
; CHECK: movl (%[[ehrec]]), %[[ehcode:[a-z]+]]
; CHECK: movl %[[ehcode]], {{.*}}(%{{.*}})