1; RUN: llc < %s | FileCheck %s --check-prefix=ASM 2; RUN: llc < %s -filetype=obj | llvm-readobj --codeview - | FileCheck %s --check-prefix=CODEVIEW 3 4; This test checks that for 32-bit x86 we use VFRAME and 5; S_DEFRANGE_FRAMEPOINTER_REL with the right offsets. The test has two function 6; calls with different stack depths, which makes it impossible to correctly 7; describe locals in memory as being ESP-relative. 8 9; The following source can be used with a debugger to check that locals are 10; displayed correctly: 11; $ cat fpo.cpp 12; #if 0 13; void __attribute__((optnone)) __declspec(noinline) f(int &a, int &b) { 14; __debugbreak(); 15; a += b; 16; } 17; void __attribute__((optnone)) __declspec(noinline) g(int &a, int &b, int &c) { 18; __debugbreak(); 19; a += b; 20; a += c; 21; } 22; #endif 23; void f(int &a, int &b); 24; void g(int &a, int &b, int &c); 25; int main() { 26; int a = 1; 27; int b = 2; 28; int c = 3; 29; f(a, b); 30; g(a, b, c); 31; return a + b + c; 32; } 33; $ clang -S -g -gcodeview t.cpp -emit-llvm -o vframe-fpo.ll -Os 34 35; ASM-LABEL: _main: 36; ASM: # %bb.0: # %entry 37; ASM-NEXT: pushl %ebx 38; ASM-NEXT: .cv_fpo_pushreg %ebx 39; ASM-NEXT: pushl %edi 40; ASM-NEXT: .cv_fpo_pushreg %edi 41; ASM-NEXT: pushl %esi 42; ASM-NEXT: .cv_fpo_pushreg %esi 43; ASM-NEXT: subl $12, %esp 44; ASM-NEXT: .cv_fpo_stackalloc 12 45; ASM-NEXT: .cv_fpo_endprologue 46 47; Store locals. 48; ASM: movl $1, {{.*}} 49; ASM: movl $2, {{.*}} 50; ASM: movl $3, {{.*}} 51 52; ASM that store-to-push conversion fires. 53; ASM: pushl 54; ASM-NEXT: pushl 55; ASM-NEXT: calll "?f@@YAXAAH0@Z" 56; ASM-NEXT: addl $8, %esp 57; ASM: pushl 58; ASM-NEXT: pushl 59; ASM-NEXT: pushl 60; ASM-NEXT: calll "?g@@YAXAAH00@Z" 61 62; CODEVIEW: CodeViewDebugInfo [ 63; CODEVIEW-NEXT: Section: .debug$S (4) 64; CODEVIEW-NEXT: Magic: 0x4 65; CODEVIEW-NEXT: Subsection [ 66; CODEVIEW-NEXT: SubSectionType: Symbols (0xF1) 67; CODEVIEW-NEXT: SubSectionSize: 68; CODEVIEW-NEXT: Compile3Sym { 69; CODEVIEW-NEXT: Kind: S_COMPILE3 (0x113C) 70; CODEVIEW: } 71; CODEVIEW: ] 72; CODEVIEW: Subsection [ 73; CODEVIEW-NEXT: SubSectionType: FrameData (0xF5) 74; CODEVIEW-NEXT: SubSectionSize: 75; CODEVIEW-NEXT: LinkageName: _main 76; CODEVIEW: FrameData { 77; CODEVIEW: } 78; CODEVIEW: FrameData { 79; CODEVIEW: } 80; CODEVIEW: FrameData { 81; CODEVIEW: } 82; CODEVIEW: FrameData { 83; CODEVIEW: } 84; CODEVIEW: FrameData { 85; CODEVIEW-NEXT: RvaStart: 86; CODEVIEW-NEXT: CodeSize: 87; CODEVIEW-NEXT: LocalSize: 0xC 88; CODEVIEW-NEXT: ParamsSize: 0x0 89; CODEVIEW-NEXT: MaxStackSize: 0x0 90; CODEVIEW-NEXT: PrologSize: 91; CODEVIEW-NEXT: SavedRegsSize: 0xC 92; CODEVIEW-NEXT: Flags [ (0x0) 93; CODEVIEW-NEXT: ] 94 95; $T0 is the CFA, the address of the return address, and our defranges are 96; relative to it. 97; CODEVIEW-NEXT: FrameFunc [ 98; CODEVIEW-NEXT: $T0 .raSearch = 99; CODEVIEW-NEXT: $eip $T0 ^ = 100; CODEVIEW-NEXT: $esp $T0 4 + = 101; CODEVIEW-NEXT: $ebx $T0 4 - ^ = 102; CODEVIEW-NEXT: $edi $T0 8 - ^ = 103; CODEVIEW-NEXT: $esi $T0 12 - ^ = 104; CODEVIEW-NEXT: ] 105; CODEVIEW-NEXT: } 106 107; We push 16 bytes in the prologue, so our local variables are at offsets -16, 108; -20, and -24. 109 110; CODEVIEW: Subsection [ 111; CODEVIEW-NEXT: SubSectionType: Symbols (0xF1) 112; CODEVIEW-NEXT: SubSectionSize: 113; CODEVIEW-NEXT: GlobalProcIdSym { 114; CODEVIEW-NEXT: Kind: S_GPROC32_ID (0x1147) 115; CODEVIEW: DisplayName: main 116; CODEVIEW: LinkageName: _main 117; CODEVIEW-NEXT: } 118; CODEVIEW-NEXT: FrameProcSym { 119; CODEVIEW-NEXT: Kind: S_FRAMEPROC (0x1012) 120; CODEVIEW-NEXT: TotalFrameBytes: 0xC 121; CODEVIEW-NEXT: PaddingFrameBytes: 0x0 122; CODEVIEW-NEXT: OffsetToPadding: 0x0 123; CODEVIEW-NEXT: BytesOfCalleeSavedRegisters: 0xC 124; CODEVIEW-NEXT: OffsetOfExceptionHandler: 0x0 125; CODEVIEW-NEXT: SectionIdOfExceptionHandler: 0x0 126; CODEVIEW-NEXT: Flags [ (0x14000) 127; CODEVIEW-NEXT: ] 128; CODEVIEW-NEXT: LocalFramePtrReg: VFRAME (0x7536) 129; CODEVIEW-NEXT: ParamFramePtrReg: VFRAME (0x7536) 130; CODEVIEW-NEXT: } 131; CODEVIEW-NEXT: LocalSym { 132; CODEVIEW-NEXT: Kind: S_LOCAL (0x113E) 133; CODEVIEW: VarName: a 134; CODEVIEW-NEXT: } 135; CODEVIEW-NEXT: DefRangeFramePointerRelSym { 136; CODEVIEW-NEXT: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142) 137; CODEVIEW-NEXT: Offset: -16 138; CODEVIEW-NEXT: LocalVariableAddrRange { 139; CODEVIEW-NEXT: OffsetStart: 140; CODEVIEW-NEXT: ISectStart: 141; CODEVIEW-NEXT: Range: 142; CODEVIEW-NEXT: } 143; CODEVIEW-NEXT: } 144; CODEVIEW-NEXT: LocalSym { 145; CODEVIEW-NEXT: Kind: S_LOCAL (0x113E) 146; CODEVIEW: VarName: b 147; CODEVIEW-NEXT: } 148; CODEVIEW-NEXT: DefRangeFramePointerRelSym { 149; CODEVIEW-NEXT: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142) 150; CODEVIEW-NEXT: Offset: -20 151; CODEVIEW-NEXT: LocalVariableAddrRange { 152; CODEVIEW-NEXT: OffsetStart: 153; CODEVIEW-NEXT: ISectStart: 154; CODEVIEW-NEXT: Range: 155; CODEVIEW-NEXT: } 156; CODEVIEW-NEXT: } 157; CODEVIEW-NEXT: LocalSym { 158; CODEVIEW-NEXT: Kind: S_LOCAL (0x113E) 159; CODEVIEW: VarName: c 160; CODEVIEW-NEXT: } 161; CODEVIEW-NEXT: DefRangeFramePointerRelSym { 162; CODEVIEW-NEXT: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142) 163; CODEVIEW-NEXT: Offset: -24 164; CODEVIEW-NEXT: LocalVariableAddrRange { 165; CODEVIEW-NEXT: OffsetStart: 166; CODEVIEW-NEXT: ISectStart: 167; CODEVIEW-NEXT: Range: 168; CODEVIEW-NEXT: } 169; CODEVIEW-NEXT: } 170; CODEVIEW-NEXT: ProcEnd { 171; CODEVIEW-NEXT: Kind: S_PROC_ID_END (0x114F) 172; CODEVIEW-NEXT: } 173; CODEVIEW-NEXT: ] 174 175 176; ModuleID = 'fpo.cpp' 177source_filename = "fpo.cpp" 178target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32" 179target triple = "i386-pc-windows-msvc19.14.26433" 180 181; Function Attrs: norecurse optsize 182define dso_local i32 @main() local_unnamed_addr #0 !dbg !8 { 183entry: 184 %a = alloca i32, align 4 185 %b = alloca i32, align 4 186 %c = alloca i32, align 4 187 %0 = bitcast i32* %a to i8*, !dbg !16 188 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0) #4, !dbg !16 189 call void @llvm.dbg.declare(metadata i32* %a, metadata !13, metadata !DIExpression()), !dbg !16 190 store i32 1, i32* %a, align 4, !dbg !16, !tbaa !17 191 %1 = bitcast i32* %b to i8*, !dbg !21 192 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %1) #4, !dbg !21 193 call void @llvm.dbg.declare(metadata i32* %b, metadata !14, metadata !DIExpression()), !dbg !21 194 store i32 2, i32* %b, align 4, !dbg !21, !tbaa !17 195 %2 = bitcast i32* %c to i8*, !dbg !22 196 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %2) #4, !dbg !22 197 call void @llvm.dbg.declare(metadata i32* %c, metadata !15, metadata !DIExpression()), !dbg !22 198 store i32 3, i32* %c, align 4, !dbg !22, !tbaa !17 199 call void @"?f@@YAXAAH0@Z"(i32* nonnull dereferenceable(4) %a, i32* nonnull dereferenceable(4) %b) #5, !dbg !23 200 call void @"?g@@YAXAAH00@Z"(i32* nonnull dereferenceable(4) %a, i32* nonnull dereferenceable(4) %b, i32* nonnull dereferenceable(4) %c) #5, !dbg !24 201 %3 = load i32, i32* %a, align 4, !dbg !25, !tbaa !17 202 %4 = load i32, i32* %b, align 4, !dbg !25, !tbaa !17 203 %add = add nsw i32 %4, %3, !dbg !25 204 %5 = load i32, i32* %c, align 4, !dbg !25, !tbaa !17 205 %add1 = add nsw i32 %add, %5, !dbg !25 206 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %2) #4, !dbg !26 207 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %1) #4, !dbg !26 208 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %0) #4, !dbg !26 209 ret i32 %add1, !dbg !25 210} 211 212; Function Attrs: argmemonly nounwind 213declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1 214 215; Function Attrs: nounwind readnone speculatable 216declare void @llvm.dbg.declare(metadata, metadata, metadata) #2 217 218; Function Attrs: optsize 219declare dso_local void @"?f@@YAXAAH0@Z"(i32* dereferenceable(4), i32* dereferenceable(4)) local_unnamed_addr #3 220 221; Function Attrs: optsize 222declare dso_local void @"?g@@YAXAAH00@Z"(i32* dereferenceable(4), i32* dereferenceable(4), i32* dereferenceable(4)) local_unnamed_addr #3 223 224; Function Attrs: argmemonly nounwind 225declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1 226 227attributes #0 = { norecurse optsize "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } 228attributes #1 = { argmemonly nounwind } 229attributes #2 = { nounwind readnone speculatable } 230attributes #3 = { optsize "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } 231attributes #4 = { nounwind } 232attributes #5 = { optsize } 233 234!llvm.dbg.cu = !{!0} 235!llvm.module.flags = !{!3, !4, !5, !6} 236!llvm.ident = !{!7} 237 238!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) 239!1 = !DIFile(filename: "fpo.cpp", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "d0bb7e43f4e54936a94da008319a7de3") 240!2 = !{} 241!3 = !{i32 1, !"NumRegisterParameters", i32 0} 242!4 = !{i32 2, !"CodeView", i32 1} 243!5 = !{i32 2, !"Debug Info Version", i32 3} 244!6 = !{i32 1, !"wchar_size", i32 2} 245!7 = !{!"clang version 8.0.0 "} 246!8 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 14, type: !9, isLocal: false, isDefinition: true, scopeLine: 14, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12) 247!9 = !DISubroutineType(types: !10) 248!10 = !{!11} 249!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 250!12 = !{!13, !14, !15} 251!13 = !DILocalVariable(name: "a", scope: !8, file: !1, line: 15, type: !11) 252!14 = !DILocalVariable(name: "b", scope: !8, file: !1, line: 16, type: !11) 253!15 = !DILocalVariable(name: "c", scope: !8, file: !1, line: 17, type: !11) 254!16 = !DILocation(line: 15, scope: !8) 255!17 = !{!18, !18, i64 0} 256!18 = !{!"int", !19, i64 0} 257!19 = !{!"omnipotent char", !20, i64 0} 258!20 = !{!"Simple C++ TBAA"} 259!21 = !DILocation(line: 16, scope: !8) 260!22 = !DILocation(line: 17, scope: !8) 261!23 = !DILocation(line: 18, scope: !8) 262!24 = !DILocation(line: 19, scope: !8) 263!25 = !DILocation(line: 20, scope: !8) 264!26 = !DILocation(line: 21, scope: !8) 265