1; RUN: llc < %s -disable-fp-elim -mtriple=arm-linux -o - | FileCheck %s 2; This test is fairly fragile. The goal is to ensure that "large" stack 3; objects are allocated closest to the stack protector (i.e., farthest away 4; from the Stack Pointer.) In standard SSP mode this means that large (>= 5; ssp-buffer-size) arrays and structures containing such arrays are 6; closet to the protector. With sspstrong and sspreq this means large 7; arrays/structures-with-arrays are closest, followed by small (< ssp-buffer-size) 8; arrays/structures-with-arrays, and then addr-taken variables. 9; 10; Ideally, we only want verify that the objects appear in the correct groups 11; and that the groups have the correct relative stack offset. The ordering 12; within a group is not relevant to this test. Unfortunately, there is not 13; an elegant way to do this, so just match the offset for each object. 14 15%struct.struct_large_char = type { [8 x i8] } 16%struct.struct_large_char2 = type { [2 x i8], [8 x i8] } 17%struct.struct_small_char = type { [2 x i8] } 18%struct.struct_large_nonchar = type { [8 x i32] } 19%struct.struct_small_nonchar = type { [2 x i16] } 20 21define void @layout_ssp() ssp { 22entry: 23; Expected stack layout for ssp is 24; 180 large_char . Group 1, nested arrays, arrays >= ssp-buffer-size 25; 172 struct_large_char . 26; 168 scalar1 | Everything else 27; 164 scalar2 28; 160 scalar3 29; 156 addr-of 30; 152 small_nonchar (84+68) 31; 112 large_nonchar 32; 110 small_char 33; 108 struct_small_char 34; 72 struct_large_nonchar 35; 68 struct_small_nonchar 36 37; CHECK: layout_ssp: 38; r[[SP]] is used as an offset into the stack later 39; CHECK: add r[[SP:[0-9]+]], sp, #68 40 41; CHECK: bl get_scalar1 42; CHECK: str r0, [sp, #168] 43; CHECK: bl end_scalar1 44 45; CHECK: bl get_scalar2 46; CHECK: str r0, [sp, #164] 47; CHECK: bl end_scalar2 48 49; CHECK: bl get_scalar3 50; CHECK: str r0, [sp, #160] 51; CHECK: bl end_scalar3 52 53; CHECK: bl get_addrof 54; CHECK: str r0, [sp, #156] 55; CHECK: bl end_addrof 56 57; CHECK: get_small_nonchar 58; CHECK: strh r0, [r[[SP]], #84] 59; CHECK: bl end_small_nonchar 60 61; CHECK: bl get_large_nonchar 62; CHECK: str r0, [sp, #112] 63; CHECK: bl end_large_nonchar 64 65; CHECK: bl get_small_char 66; CHECK: strb r0, [sp, #110] 67; CHECK: bl end_small_char 68 69; CHECK: bl get_large_char 70; CHECK: strb r0, [sp, #180] 71; CHECK: bl end_large_char 72 73; CHECK: bl get_struct_large_char 74; CHECK: strb r0, [sp, #172] 75; CHECK: bl end_struct_large_char 76 77; CHECK: bl get_struct_small_char 78; CHECK: strb r0, [sp, #108] 79; CHECK: bl end_struct_small_char 80 81; CHECK: bl get_struct_large_nonchar 82; CHECK:str r0, [sp, #72] 83; CHECK: bl end_struct_large_nonchar 84 85; CHECK: bl get_struct_small_nonchar 86; CHECK: strh r0, [r[[SP]]] 87; CHECK: bl end_struct_small_nonchar 88 %x = alloca i32, align 4 89 %y = alloca i32, align 4 90 %z = alloca i32, align 4 91 %ptr = alloca i32, align 4 92 %small2 = alloca [2 x i16], align 2 93 %large2 = alloca [8 x i32], align 16 94 %small = alloca [2 x i8], align 1 95 %large = alloca [8 x i8], align 1 96 %a = alloca %struct.struct_large_char, align 1 97 %b = alloca %struct.struct_small_char, align 1 98 %c = alloca %struct.struct_large_nonchar, align 8 99 %d = alloca %struct.struct_small_nonchar, align 2 100 %call = call i32 @get_scalar1() 101 store i32 %call, i32* %x, align 4 102 call void @end_scalar1() 103 %call1 = call i32 @get_scalar2() 104 store i32 %call1, i32* %y, align 4 105 call void @end_scalar2() 106 %call2 = call i32 @get_scalar3() 107 store i32 %call2, i32* %z, align 4 108 call void @end_scalar3() 109 %call3 = call i32 @get_addrof() 110 store i32 %call3, i32* %ptr, align 4 111 call void @end_addrof() 112 %call4 = call signext i16 @get_small_nonchar() 113 %arrayidx = getelementptr inbounds [2 x i16]* %small2, i32 0, i64 0 114 store i16 %call4, i16* %arrayidx, align 2 115 call void @end_small_nonchar() 116 %call5 = call i32 @get_large_nonchar() 117 %arrayidx6 = getelementptr inbounds [8 x i32]* %large2, i32 0, i64 0 118 store i32 %call5, i32* %arrayidx6, align 4 119 call void @end_large_nonchar() 120 %call7 = call signext i8 @get_small_char() 121 %arrayidx8 = getelementptr inbounds [2 x i8]* %small, i32 0, i64 0 122 store i8 %call7, i8* %arrayidx8, align 1 123 call void @end_small_char() 124 %call9 = call signext i8 @get_large_char() 125 %arrayidx10 = getelementptr inbounds [8 x i8]* %large, i32 0, i64 0 126 store i8 %call9, i8* %arrayidx10, align 1 127 call void @end_large_char() 128 %call11 = call signext i8 @get_struct_large_char() 129 %foo = getelementptr inbounds %struct.struct_large_char* %a, i32 0, i32 0 130 %arrayidx12 = getelementptr inbounds [8 x i8]* %foo, i32 0, i64 0 131 store i8 %call11, i8* %arrayidx12, align 1 132 call void @end_struct_large_char() 133 %call13 = call signext i8 @get_struct_small_char() 134 %foo14 = getelementptr inbounds %struct.struct_small_char* %b, i32 0, i32 0 135 %arrayidx15 = getelementptr inbounds [2 x i8]* %foo14, i32 0, i64 0 136 store i8 %call13, i8* %arrayidx15, align 1 137 call void @end_struct_small_char() 138 %call16 = call i32 @get_struct_large_nonchar() 139 %foo17 = getelementptr inbounds %struct.struct_large_nonchar* %c, i32 0, i32 0 140 %arrayidx18 = getelementptr inbounds [8 x i32]* %foo17, i32 0, i64 0 141 store i32 %call16, i32* %arrayidx18, align 4 142 call void @end_struct_large_nonchar() 143 %call19 = call signext i16 @get_struct_small_nonchar() 144 %foo20 = getelementptr inbounds %struct.struct_small_nonchar* %d, i32 0, i32 0 145 %arrayidx21 = getelementptr inbounds [2 x i16]* %foo20, i32 0, i64 0 146 store i16 %call19, i16* %arrayidx21, align 2 147 call void @end_struct_small_nonchar() 148 %arraydecay = getelementptr inbounds [8 x i8]* %large, i32 0, i32 0 149 %arraydecay22 = getelementptr inbounds [2 x i8]* %small, i32 0, i32 0 150 %arraydecay23 = getelementptr inbounds [8 x i32]* %large2, i32 0, i32 0 151 %arraydecay24 = getelementptr inbounds [2 x i16]* %small2, i32 0, i32 0 152 %0 = load i32* %x, align 4 153 %1 = load i32* %y, align 4 154 %2 = load i32* %z, align 4 155 %coerce.dive = getelementptr %struct.struct_large_char* %a, i32 0, i32 0 156 %3 = bitcast [8 x i8]* %coerce.dive to i64* 157 %4 = load i64* %3, align 1 158 %coerce.dive25 = getelementptr %struct.struct_small_char* %b, i32 0, i32 0 159 %5 = bitcast [2 x i8]* %coerce.dive25 to i16* 160 %6 = load i16* %5, align 1 161 %coerce.dive26 = getelementptr %struct.struct_small_nonchar* %d, i32 0, i32 0 162 %7 = bitcast [2 x i16]* %coerce.dive26 to i32* 163 %8 = load i32* %7, align 1 164 call void @takes_all(i64 %4, i16 %6, %struct.struct_large_nonchar* byval align 8 %c, i32 %8, i8* %arraydecay, i8* %arraydecay22, i32* %arraydecay23, i16* %arraydecay24, i32* %ptr, i32 %0, i32 %1, i32 %2) 165 ret void 166} 167 168declare i32 @get_scalar1() 169declare void @end_scalar1() 170 171declare i32 @get_scalar2() 172declare void @end_scalar2() 173 174declare i32 @get_scalar3() 175declare void @end_scalar3() 176 177declare i32 @get_addrof() 178declare void @end_addrof() 179 180declare signext i16 @get_small_nonchar() 181declare void @end_small_nonchar() 182 183declare i32 @get_large_nonchar() 184declare void @end_large_nonchar() 185 186declare signext i8 @get_small_char() 187declare void @end_small_char() 188 189declare signext i8 @get_large_char() 190declare void @end_large_char() 191 192declare signext i8 @get_struct_large_char() 193declare void @end_struct_large_char() 194 195declare signext i8 @get_struct_large_char2() 196declare void @end_struct_large_char2() 197 198declare signext i8 @get_struct_small_char() 199declare void @end_struct_small_char() 200 201declare i32 @get_struct_large_nonchar() 202declare void @end_struct_large_nonchar() 203 204declare signext i16 @get_struct_small_nonchar() 205declare void @end_struct_small_nonchar() 206 207declare void @takes_all(i64, i16, %struct.struct_large_nonchar* byval align 8, i32, i8*, i8*, i32*, i16*, i32*, i32, i32, i32) 208