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1; RUN: llc < %s | FileCheck %s --check-prefix=ASM2; RUN: llc < %s -filetype=obj | llvm-readobj --codeview - | FileCheck %s --check-prefix=CODEVIEW3 4; This test checks that for 32-bit x86 we use VFRAME and5; S_DEFRANGE_FRAMEPOINTER_REL with the right offsets. The test has two function6; calls with different stack depths, which makes it impossible to correctly7; describe locals in memory as being ESP-relative.8 9; The following source can be used with a debugger to check that locals are10; displayed correctly:11; $ cat fpo.cpp12; #if 013; 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; #endif23; 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 -Os34 35; ASM-LABEL: _main:36; ASM: # %bb.0: # %entry37; ASM-NEXT: pushl %ebx38; ASM-NEXT: .cv_fpo_pushreg %ebx39; ASM-NEXT: pushl %edi40; ASM-NEXT: .cv_fpo_pushreg %edi41; ASM-NEXT: pushl %esi42; ASM-NEXT: .cv_fpo_pushreg %esi43; ASM-NEXT: subl $12, %esp44; ASM-NEXT: .cv_fpo_stackalloc 1245; ASM-NEXT: .cv_fpo_endprologue46 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: pushl54; ASM-NEXT: pushl55; ASM-NEXT: calll "?f@@YAXAAH0@Z"56; ASM-NEXT: addl $8, %esp57; ASM: pushl58; ASM-NEXT: pushl59; ASM-NEXT: pushl60; ASM-NEXT: calll "?g@@YAXAAH00@Z"61 62; CODEVIEW: CodeViewDebugInfo [63; CODEVIEW-NEXT: Section: .debug$S (4)64; CODEVIEW-NEXT: Magic: 0x465; CODEVIEW-NEXT: Subsection [66; CODEVIEW-NEXT: SubSectionType: Symbols (0xF1)67; CODEVIEW-NEXT: SubSectionSize:68; CODEVIEW-NEXT: ObjNameSym {69; CODEVIEW-NEXT: Kind: S_OBJNAME (0x1101)70; CODEVIEW: Compile3Sym {71; CODEVIEW-NEXT: Kind: S_COMPILE3 (0x113C)72; CODEVIEW: }73; CODEVIEW: ]74; CODEVIEW: Subsection [75; CODEVIEW-NEXT: SubSectionType: FrameData (0xF5)76; CODEVIEW-NEXT: SubSectionSize:77; CODEVIEW-NEXT: LinkageName: _main78; CODEVIEW: FrameData {79; CODEVIEW: }80; CODEVIEW: FrameData {81; CODEVIEW: }82; CODEVIEW: FrameData {83; CODEVIEW: }84; CODEVIEW: FrameData {85; CODEVIEW: }86; CODEVIEW: FrameData {87; CODEVIEW-NEXT: RvaStart:88; CODEVIEW-NEXT: CodeSize:89; CODEVIEW-NEXT: LocalSize: 0xC90; CODEVIEW-NEXT: ParamsSize: 0x091; CODEVIEW-NEXT: MaxStackSize: 0x092; CODEVIEW-NEXT: PrologSize:93; CODEVIEW-NEXT: SavedRegsSize: 0xC94; CODEVIEW-NEXT: Flags [ (0x0)95; CODEVIEW-NEXT: ]96 97; $T0 is the CFA, the address of the return address, and our defranges are98; relative to it.99; CODEVIEW-NEXT: FrameFunc [100; CODEVIEW-NEXT: $T0 .raSearch =101; CODEVIEW-NEXT: $eip $T0 ^ =102; CODEVIEW-NEXT: $esp $T0 4 + =103; CODEVIEW-NEXT: $ebx $T0 4 - ^ =104; CODEVIEW-NEXT: $edi $T0 8 - ^ =105; CODEVIEW-NEXT: $esi $T0 12 - ^ =106; CODEVIEW-NEXT: ]107; CODEVIEW-NEXT: }108 109; We push 16 bytes in the prologue, so our local variables are at offsets -16,110; -20, and -24.111 112; CODEVIEW: Subsection [113; CODEVIEW-NEXT: SubSectionType: Symbols (0xF1)114; CODEVIEW-NEXT: SubSectionSize:115; CODEVIEW-NEXT: GlobalProcIdSym {116; CODEVIEW-NEXT: Kind: S_GPROC32_ID (0x1147)117; CODEVIEW: DisplayName: main118; CODEVIEW: LinkageName: _main119; CODEVIEW-NEXT: }120; CODEVIEW-NEXT: FrameProcSym {121; CODEVIEW-NEXT: Kind: S_FRAMEPROC (0x1012)122; CODEVIEW-NEXT: TotalFrameBytes: 0xC123; CODEVIEW-NEXT: PaddingFrameBytes: 0x0124; CODEVIEW-NEXT: OffsetToPadding: 0x0125; CODEVIEW-NEXT: BytesOfCalleeSavedRegisters: 0xC126; CODEVIEW-NEXT: OffsetOfExceptionHandler: 0x0127; CODEVIEW-NEXT: SectionIdOfExceptionHandler: 0x0128; CODEVIEW-NEXT: Flags [ (0x16000)129; CODEVIEW-NEXT: SafeBuffers (0x2000)130; CODEVIEW-NEXT: ]131; CODEVIEW-NEXT: LocalFramePtrReg: VFRAME (0x7536)132; CODEVIEW-NEXT: ParamFramePtrReg: VFRAME (0x7536)133; CODEVIEW-NEXT: }134; CODEVIEW-NEXT: LocalSym {135; CODEVIEW-NEXT: Kind: S_LOCAL (0x113E)136; CODEVIEW: VarName: a137; CODEVIEW-NEXT: }138; CODEVIEW-NEXT: DefRangeFramePointerRelSym {139; CODEVIEW-NEXT: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142)140; CODEVIEW-NEXT: Offset: -16141; CODEVIEW-NEXT: LocalVariableAddrRange {142; CODEVIEW-NEXT: OffsetStart:143; CODEVIEW-NEXT: ISectStart:144; CODEVIEW-NEXT: Range:145; CODEVIEW-NEXT: }146; CODEVIEW-NEXT: }147; CODEVIEW-NEXT: LocalSym {148; CODEVIEW-NEXT: Kind: S_LOCAL (0x113E)149; CODEVIEW: VarName: b150; CODEVIEW-NEXT: }151; CODEVIEW-NEXT: DefRangeFramePointerRelSym {152; CODEVIEW-NEXT: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142)153; CODEVIEW-NEXT: Offset: -20154; CODEVIEW-NEXT: LocalVariableAddrRange {155; CODEVIEW-NEXT: OffsetStart:156; CODEVIEW-NEXT: ISectStart:157; CODEVIEW-NEXT: Range:158; CODEVIEW-NEXT: }159; CODEVIEW-NEXT: }160; CODEVIEW-NEXT: LocalSym {161; CODEVIEW-NEXT: Kind: S_LOCAL (0x113E)162; CODEVIEW: VarName: c163; CODEVIEW-NEXT: }164; CODEVIEW-NEXT: DefRangeFramePointerRelSym {165; CODEVIEW-NEXT: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142)166; CODEVIEW-NEXT: Offset: -24167; CODEVIEW-NEXT: LocalVariableAddrRange {168; CODEVIEW-NEXT: OffsetStart:169; CODEVIEW-NEXT: ISectStart:170; CODEVIEW-NEXT: Range:171; CODEVIEW-NEXT: }172; CODEVIEW-NEXT: }173; CODEVIEW-NEXT: ProcEnd {174; CODEVIEW-NEXT: Kind: S_PROC_ID_END (0x114F)175; CODEVIEW-NEXT: }176; CODEVIEW-NEXT: ]177 178 179; ModuleID = 'fpo.cpp'180source_filename = "fpo.cpp"181target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"182target triple = "i386-pc-windows-msvc19.14.26433"183 184; Function Attrs: norecurse optsize185define dso_local i32 @main() local_unnamed_addr #0 !dbg !8 {186entry:187 %a = alloca i32, align 4188 %b = alloca i32, align 4189 %c = alloca i32, align 4190 call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %a) #4, !dbg !16191 call void @llvm.dbg.declare(metadata ptr %a, metadata !13, metadata !DIExpression()), !dbg !16192 store i32 1, ptr %a, align 4, !dbg !16, !tbaa !17193 call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %b) #4, !dbg !21194 call void @llvm.dbg.declare(metadata ptr %b, metadata !14, metadata !DIExpression()), !dbg !21195 store i32 2, ptr %b, align 4, !dbg !21, !tbaa !17196 call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %c) #4, !dbg !22197 call void @llvm.dbg.declare(metadata ptr %c, metadata !15, metadata !DIExpression()), !dbg !22198 store i32 3, ptr %c, align 4, !dbg !22, !tbaa !17199 call void @"?f@@YAXAAH0@Z"(ptr nonnull dereferenceable(4) %a, ptr nonnull dereferenceable(4) %b) #5, !dbg !23200 call void @"?g@@YAXAAH00@Z"(ptr nonnull dereferenceable(4) %a, ptr nonnull dereferenceable(4) %b, ptr nonnull dereferenceable(4) %c) #5, !dbg !24201 %0 = load i32, ptr %a, align 4, !dbg !25, !tbaa !17202 %1 = load i32, ptr %b, align 4, !dbg !25, !tbaa !17203 %add = add nsw i32 %1, %0, !dbg !25204 %2 = load i32, ptr %c, align 4, !dbg !25, !tbaa !17205 %add1 = add nsw i32 %add, %2, !dbg !25206 call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %c) #4, !dbg !26207 call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %b) #4, !dbg !26208 call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %a) #4, !dbg !26209 ret i32 %add1, !dbg !25210}211 212; Function Attrs: argmemonly nounwind213declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #1214 215; Function Attrs: nounwind readnone speculatable216declare void @llvm.dbg.declare(metadata, metadata, metadata) #2217 218; Function Attrs: optsize219declare dso_local void @"?f@@YAXAAH0@Z"(ptr dereferenceable(4), ptr dereferenceable(4)) local_unnamed_addr #3220 221; Function Attrs: optsize222declare dso_local void @"?g@@YAXAAH00@Z"(ptr dereferenceable(4), ptr dereferenceable(4), ptr dereferenceable(4)) local_unnamed_addr #3223 224; Function Attrs: argmemonly nounwind225declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #1226 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" "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" "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