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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
; RUN: llc -mtriple=i686-pc-windows-msvc < %s | FileCheck %s --check-prefix=X86
; RUN: llc -mtriple=x86_64-pc-windows-msvc < %s | FileCheck %s --check-prefix=X64
; Based on this source:
; extern "C" void may_throw(int);
; void f() {
; try {
; may_throw(1);
; try {
; may_throw(2);
; } catch (int) {
; may_throw(3);
; }
; } catch (int) {
; may_throw(4);
; }
; }
%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
%eh.CatchHandlerType = type { i32, i8* }
declare void @may_throw(i32)
declare i32 @__CxxFrameHandler3(...)
declare void @llvm.eh.begincatch(i8*, i8*)
declare void @llvm.eh.endcatch()
declare i32 @llvm.eh.typeid.for(i8*)
$"\01??_R0H@8" = comdat any
@"\01??_7type_info@@6B@" = external constant i8*
@"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
@llvm.eh.handlertype.H.0 = private unnamed_addr constant %eh.CatchHandlerType { i32 0, i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*) }, section "llvm.metadata"
define void @f() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
entry:
invoke void @may_throw(i32 1)
to label %invoke.cont unwind label %lpad.1
invoke.cont: ; preds = %entry
invoke void @may_throw(i32 2)
to label %try.cont.9 unwind label %lpad
try.cont.9: ; preds = %invoke.cont.3, %invoke.cont, %catch.7
ret void
lpad: ; preds = %catch, %entry
%cs1 = catchswitch within none [label %catch] unwind label %lpad.1
catch: ; preds = %lpad.1
%p1 = catchpad within %cs1 [%rtti.TypeDescriptor2* @"\01??_R0H@8", i32 0, i8* null]
invoke void @may_throw(i32 3) [ "funclet"(token %p1) ]
to label %invoke.cont.3 unwind label %lpad.1
invoke.cont.3: ; preds = %catch
catchret from %p1 to label %try.cont.9
lpad.1: ; preds = %invoke.cont
%cs2 = catchswitch within none [label %catch.7] unwind to caller
catch.7:
%p2 = catchpad within %cs2 [%rtti.TypeDescriptor2* @"\01??_R0H@8", i32 0, i8* null]
call void @may_throw(i32 4) [ "funclet"(token %p2) ]
catchret from %p2 to label %try.cont.9
}
; X86-LABEL: _f:
; X86: movl $-1, [[state:[-0-9]+]](%ebp)
; X86: movl $___ehhandler$f, {{.*}}
;
; X86: movl $0, [[state]](%ebp)
; X86: pushl $1
; X86: calll _may_throw
;
; X86: movl $1, [[state]](%ebp)
; X86: pushl $2
; X86: calll _may_throw
;
; X86: movl $2, [[state]](%ebp)
; X86: pushl $3
; X86: calll _may_throw
;
; X86: movl $3, [[state]](%ebp)
; X86: pushl $4
; X86: calll _may_throw
; X64-LABEL: f:
; X64-LABEL: $ip2state$f:
; X64-NEXT: .long .Lfunc_begin0@IMGREL
; X64-NEXT: .long -1
; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
; X64-NEXT: .long 0
; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
; X64-NEXT: .long 1
; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
; X64-NEXT: .long -1
; X64-NEXT: .long "?catch${{.*}}@?0?f@4HA"@IMGREL
; X64-NEXT: .long 2
; X64-NEXT: .long "?catch${{.*}}@?0?f@4HA"@IMGREL
; X64-NEXT: .long 3
; Based on this source:
; extern "C" void may_throw(int);
; struct S { ~S(); };
; void g() {
; S x;
; try {
; may_throw(-1);
; } catch (...) {
; may_throw(0);
; {
; S y;
; may_throw(1);
; }
; may_throw(2);
; }
; }
%struct.S = type { i8 }
declare void @"\01??1S@@QEAA@XZ"(%struct.S*)
define void @g() personality i32 (...)* @__CxxFrameHandler3 {
entry:
%x = alloca %struct.S, align 1
%y = alloca %struct.S, align 1
invoke void @may_throw(i32 -1)
to label %unreachable unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch] unwind label %ehcleanup5
catch: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* null, i32 64, i8* null]
invoke void @may_throw(i32 0) [ "funclet"(token %1) ]
to label %invoke.cont unwind label %ehcleanup5
invoke.cont: ; preds = %catch
invoke void @may_throw(i32 1) [ "funclet"(token %1) ]
to label %invoke.cont2 unwind label %ehcleanup
invoke.cont2: ; preds = %invoke.cont
invoke void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %y) [ "funclet"(token %1) ]
to label %invoke.cont3 unwind label %ehcleanup5
invoke.cont3: ; preds = %invoke.cont2
invoke void @may_throw(i32 2) [ "funclet"(token %1) ]
to label %invoke.cont4 unwind label %ehcleanup5
invoke.cont4: ; preds = %invoke.cont3
catchret from %1 to label %try.cont
try.cont: ; preds = %invoke.cont4
call void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %x)
ret void
ehcleanup: ; preds = %invoke.cont
%2 = cleanuppad within %1 []
call void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %y) [ "funclet"(token %2) ]
cleanupret from %2 unwind label %ehcleanup5
ehcleanup5: ; preds = %invoke.cont2, %invoke.cont3, %ehcleanup, %catch, %catch.dispatch
%3 = cleanuppad within none []
call void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %x) [ "funclet"(token %3) ]
cleanupret from %3 unwind to caller
unreachable: ; preds = %entry
unreachable
}
; X86-LABEL: _g:
; X86: movl $-1, [[state:[-0-9]+]](%ebp)
; X86: movl $___ehhandler$g, {{.*}}
;
; X86: movl $1, [[state]](%ebp)
; X86: pushl $-1
; X86: calll _may_throw
;
; X86: movl $2, [[state]](%ebp)
; X86: pushl $0
; X86: calll _may_throw
;
; X86: movl $3, [[state]](%ebp)
; X86: pushl $1
; X86: calll _may_throw
;
; X86: movl $2, [[state]](%ebp)
; X86: pushl $2
; X86: calll _may_throw
; X64-LABEL: g:
; X64-LABEL: $ip2state$g:
; X64-NEXT: .long .Lfunc_begin1@IMGREL
; X64-NEXT: .long -1
; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
; X64-NEXT: .long 1
; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
; X64-NEXT: .long -1
; X64-NEXT: .long "?catch${{.*}}@?0?g@4HA"@IMGREL
; X64-NEXT: .long 2
; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
; X64-NEXT: .long 3
; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
; X64-NEXT: .long 2
; X86: .safeseh ___ehhandler$f
; X86: .safeseh ___ehhandler$g
|
