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
|
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm %s -o - -verify | FileCheck %s
// CHECK: @weakvar = weak global
// CHECK: @__weakvar_alias = common global
// CHECK: @correct_linkage = weak global
// CHECK-DAG: @both = alias void (), void ()* @__both
// CHECK-DAG: @both2 = alias void (), void ()* @__both2
// CHECK-DAG: @weakvar_alias = weak alias i32, i32* @__weakvar_alias
// CHECK-DAG: @foo = weak alias void (), void ()* @__foo
// CHECK-DAG: @foo2 = weak alias void (), void ()* @__foo2
// CHECK-DAG: @stutter = weak alias void (), void ()* @__stutter
// CHECK-DAG: @stutter2 = weak alias void (), void ()* @__stutter2
// CHECK-DAG: @declfirst = weak alias void (), void ()* @__declfirst
// CHECK-DAG: @declfirstattr = weak alias void (), void ()* @__declfirstattr
// CHECK-DAG: @mix2 = weak alias void (), void ()* @__mix2
// CHECK-DAG: @a1 = weak alias void (), void ()* @__a1
// CHECK-DAG: @xxx = weak alias void (), void ()* @__xxx
// CHECK-LABEL: define weak void @weakdef()
#pragma weak weakvar
int weakvar;
#pragma weak weakdef
void weakdef(void) {}
#pragma weak param // expected-warning {{weak identifier 'param' never declared}}
#pragma weak correct_linkage
void f(int param) {
int correct_linkage;
}
#pragma weak weakvar_alias = __weakvar_alias
int __weakvar_alias;
#pragma weak foo = __foo
void __foo(void) {}
// CHECK-LABEL: define void @__foo()
void __foo2(void) {}
#pragma weak foo2 = __foo2
// CHECK-LABEL: define void @__foo2()
///// test errors
#pragma weak unused // expected-warning {{weak identifier 'unused' never declared}}
#pragma weak unused_alias = __unused_alias // expected-warning {{weak identifier '__unused_alias' never declared}}
#pragma weak td // expected-warning {{'weak' attribute only applies to variables and functions}}
typedef int td;
#pragma weak td2 = __td2 // expected-warning {{'weak' attribute only applies to variables and functions}}
typedef int __td2;
typedef int __td3;
#pragma weak td3 = __td3 // expected-warning {{'weak' attribute only applies to variables and functions}}
///// test weird cases
// test repeats
#pragma weak stutter = __stutter
#pragma weak stutter = __stutter
void __stutter(void) {}
// CHECK-LABEL: define void @__stutter()
void __stutter2(void) {}
#pragma weak stutter2 = __stutter2
#pragma weak stutter2 = __stutter2
// CHECK-LABEL: define void @__stutter2()
// test decl/pragma weak order
void __declfirst(void);
#pragma weak declfirst = __declfirst
void __declfirst(void) {}
// CHECK-LABEL: define void @__declfirst()
void __declfirstattr(void) __attribute((noinline));
#pragma weak declfirstattr = __declfirstattr
void __declfirstattr(void) {}
// CHECK-LABEL: define void @__declfirstattr()
//// test that other attributes are preserved
//// ensure that pragma weak/__attribute((weak)) play nice
void mix(void);
#pragma weak mix
__attribute((weak)) void mix(void) { }
// CHECK-LABEL: define weak void @mix()
// ensure following __attributes are preserved and that only a single
// alias is generated
#pragma weak mix2 = __mix2
void __mix2(void) __attribute((noinline));
void __mix2(void) __attribute((noinline));
void __mix2(void) {}
// CHECK-LABEL: define void @__mix2()
////////////// test #pragma weak/__attribute combinations
// if the SAME ALIAS is already declared then it overrides #pragma weak
// resulting in a non-weak alias in this case
void both(void) __attribute((alias("__both")));
#pragma weak both = __both
void __both(void) {}
// CHECK-LABEL: define void @__both()
// if the TARGET is previously declared then whichever aliasing method
// comes first applies and subsequent aliases are discarded.
// TODO: warn about this
void __both2(void);
void both2(void) __attribute((alias("__both2"))); // first, wins
#pragma weak both2 = __both2
void __both2(void) {}
// CHECK-LABEL: define void @__both2()
///////////// ensure that #pragma weak does not alter existing __attributes()
void __a1(void) __attribute((noinline));
#pragma weak a1 = __a1
void __a1(void) {}
// CHECK: define void @__a1() [[NI:#[0-9]+]]
#pragma weak xxx = __xxx
__attribute((pure,noinline,const)) void __xxx(void) { }
// CHECK: void @__xxx() [[RN:#[0-9]+]]
///////////// PR10878: Make sure we can call a weak alias
void SHA512Pad(void *context) {}
#pragma weak SHA384Pad = SHA512Pad
void PR10878() { SHA384Pad(0); }
// CHECK: call void @SHA384Pad(i8* null)
// PR14046: Parse #pragma weak in function-local context
extern int PR14046e(void);
void PR14046f() {
#pragma weak PR14046e
PR14046e();
}
// CHECK: declare extern_weak i32 @PR14046e()
// Parse #pragma weak after a label or case statement
extern int PR16705a(void);
extern int PR16705b(void);
extern int PR16705c(void);
void PR16705f(int a) {
switch(a) {
case 1:
#pragma weak PR16705a
PR16705a();
default:
#pragma weak PR16705b
PR16705b();
}
label:
#pragma weak PR16705c
PR16705c();
}
// CHECK: declare extern_weak i32 @PR16705a()
// CHECK: declare extern_weak i32 @PR16705b()
// CHECK: declare extern_weak i32 @PR16705c()
///////////// TODO: stuff that still doesn't work
// due to the fact that disparate TopLevelDecls cannot affect each other
// (due to clang's Parser and ASTConsumer behavior, and quite reasonable)
// #pragma weak must appear before or within the same TopLevelDecl as it
// references.
void yyy(void){}
void zzz(void){}
#pragma weak yyy
// NOTE: weak doesn't apply, not before or in same TopLevelDec(!)
// CHECK-LABEL: define void @yyy()
int correct_linkage;
// CHECK: attributes [[NI]] = { noinline nounwind{{.*}} }
// CHECK: attributes [[RN]] = { noinline nounwind optnone readnone{{.*}} }
|
