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
|
; RUN: llc < %s | FileCheck %s
; Based on this code:
;
; extern "C" int array[4];
; extern "C" void global_array(int idx1, int idx2, int idx3) {
; try {
; array[idx1] = 111;
; throw;
; } catch (...) {
; array[idx2] = 222;
; }
; array[idx3] = 333;
; }
; extern "C" __declspec(dllimport) int imported;
; extern "C" void access_imported() {
; try {
; imported = 111;
; throw;
; } catch (...) {
; imported = 222;
; }
; imported = 333;
; }
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc18.0.0"
%eh.ThrowInfo = type { i32, i32, i32, i32 }
@array = external global [4 x i32], align 16
@imported = external dllimport global i32, align 4
; Function Attrs: uwtable
define void @global_array(i32 %idx1, i32 %idx2, i32 %idx3) #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
entry:
%idxprom = sext i32 %idx1 to i64
%arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* @array, i64 0, i64 %idxprom
store i32 111, i32* %arrayidx, align 4, !tbaa !2
invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) #1
to label %unreachable unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %catch] unwind to caller
catch: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* null, i32 64, i8* null]
%idxprom1 = sext i32 %idx2 to i64
%arrayidx2 = getelementptr inbounds [4 x i32], [4 x i32]* @array, i64 0, i64 %idxprom1
store i32 222, i32* %arrayidx2, align 4, !tbaa !2
catchret from %0 to label %try.cont
try.cont: ; preds = %catch
%idxprom3 = sext i32 %idx3 to i64
%arrayidx4 = getelementptr inbounds [4 x i32], [4 x i32]* @array, i64 0, i64 %idxprom3
store i32 333, i32* %arrayidx4, align 4, !tbaa !2
ret void
unreachable: ; preds = %entry
unreachable
}
; CHECK-LABEL: global_array: # @global_array
; CHECK: pushq %rbp
; First array access
; CHECK: movslq %ecx, %[[idx:[^ ]*]]
; CHECK: leaq array(%rip), %[[base:[^ ]*]]
; CHECK: movl $111, (%[[base]],%[[idx]],4)
; Might throw an exception and return to below...
; CHECK: callq _CxxThrowException
; Third array access must remat the address of array
; CHECK: movslq {{.*}}, %[[idx:[^ ]*]]
; CHECK: leaq array(%rip), %[[base:[^ ]*]]
; CHECK: movl $333, (%[[base]],%[[idx]],4)
; CHECK: popq %rbp
; CHECK: retq
; CHECK: "?catch${{[0-9]+}}@?0?global_array@4HA":
; CHECK: pushq %rbp
; CHECK: movslq {{.*}}, %[[idx:[^ ]*]]
; CHECK: leaq array(%rip), %[[base:[^ ]*]]
; CHECK: movl $222, (%[[base]],%[[idx]],4)
; CHECK: popq %rbp
; CHECK: retq # CATCHRET
declare void @_CxxThrowException(i8*, %eh.ThrowInfo*)
declare i32 @__CxxFrameHandler3(...)
; Function Attrs: uwtable
define void @access_imported() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
entry:
store i32 111, i32* @imported, align 4, !tbaa !2
invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) #1
to label %unreachable unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %catch] unwind to caller
catch: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* null, i32 64, i8* null]
store i32 222, i32* @imported, align 4, !tbaa !2
catchret from %0 to label %try.cont
try.cont: ; preds = %catch
store i32 333, i32* @imported, align 4, !tbaa !2
ret void
unreachable: ; preds = %entry
unreachable
}
; CHECK-LABEL: access_imported: # @access_imported
; CHECK: pushq %rbp
; CHECK: movq __imp_imported(%rip), %[[base:[^ ]*]]
; CHECK: movl $111, (%[[base]])
; Might throw an exception and return to below...
; CHECK: callq _CxxThrowException
; Third access must reload the address of imported
; CHECK: movq __imp_imported(%rip), %[[base:[^ ]*]]
; CHECK: movl $333, (%[[base]])
; CHECK: popq %rbp
; CHECK: retq
; CHECK: "?catch${{[0-9]+}}@?0?access_imported@4HA":
; CHECK: pushq %rbp
; CHECK: movq __imp_imported(%rip), %[[base:[^ ]*]]
; CHECK: movl $222, (%[[base]])
; CHECK: popq %rbp
; CHECK: retq # CATCHRET
attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { noreturn }
!llvm.module.flags = !{!0}
!llvm.ident = !{!1}
!0 = !{i32 1, !"PIC Level", i32 2}
!1 = !{!"clang version 3.8.0 "}
!2 = !{!3, !3, i64 0}
!3 = !{!"int", !4, i64 0}
!4 = !{!"omnipotent char", !5, i64 0}
!5 = !{!"Simple C/C++ TBAA"}
|
