}
bool DwarfExpression::AddMachineReg(const TargetRegisterInfo &TRI,
- unsigned MachineReg) {
+ unsigned MachineReg, unsigned MaxSize) {
if (!TRI.isPhysicalRegister(MachineReg))
return false;
// its range, emit a DWARF piece for it.
if (Reg >= 0 && Intersection.any()) {
AddReg(Reg, "sub-register");
+ if (Offset >= MaxSize)
+ break;
// Emit a piece for the any gap in the coverage.
if (Offset > CurPos)
AddOpPiece(Offset - CurPos);
- AddOpPiece(Size);
+ AddOpPiece(std::min<unsigned>(Size, MaxSize - Offset));
CurPos = Offset + Size;
// Mark it as emitted.
bool ValidReg = false;
auto Op = ExprCursor.peek();
switch (Op->getOp()) {
- default:
- ValidReg = AddMachineReg(TRI, MachineReg);
+ default: {
+ auto Fragment = ExprCursor.getFragmentInfo();
+ ValidReg = AddMachineReg(TRI, MachineReg,
+ Fragment ? Fragment->SizeInBits : ~1U);
break;
+ }
case dwarf::DW_OP_plus:
case dwarf::DW_OP_minus: {
// [DW_OP_reg,Offset,DW_OP_plus, DW_OP_deref] --> [DW_OP_breg, Offset].
}
/// Determine whether there are any operations left in this expression.
operator bool() const { return Start != End; }
+
+ /// Retrieve the fragment information, if any.
+ Optional<DIExpression::FragmentInfo> getFragmentInfo() const {
+ return DIExpression::getFragmentInfo(Start, End);
+ }
};
/// Base class containing the logic for constructing DWARF expressions
/// Emit a partial DWARF register operation.
///
/// \param MachineReg The register number.
+ /// \param MaxSize If the register must be composed from
+ /// sub-registers this is an upper bound
+ /// for how many bits the emitted DW_OP_piece
+ /// may cover.
///
/// If size and offset is zero an operation for the entire register is
/// emitted: Some targets do not provide a DWARF register number for every
/// multiple subregisters that alias the register.
///
/// \return false if no DWARF register exists for MachineReg.
- bool AddMachineReg(const TargetRegisterInfo &TRI, unsigned MachineReg);
+ bool AddMachineReg(const TargetRegisterInfo &TRI, unsigned MachineReg,
+ unsigned MaxSize = ~1U);
/// Emit a signed constant.
void AddSignedConstant(int64_t Value);
--- /dev/null
+; RUN: llc %s -filetype=obj -o - | llvm-dwarfdump - | FileCheck %s
+; This tests a fragment that partially covers subregister compositions.
+;
+; Our fragment is 96 bits long and lies in a 128-bit register, which
+; in turn has to be composed out of its two 64-bit subregisters.
+
+; CHECK: .debug_info
+; CHECK: DW_TAG_subprogram
+; CHECK: DW_AT_name {{.*}}"subscript.get"
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x00000000)
+; CHECK: .debug_loc
+; CHECK: 0x00000000: Beginning address offset
+; CHECK-NEXT: Ending address offset
+; CHECK-NEXT: Location description: 90 90 02 93 08 90 91 02 93 04
+; d16, piece 0x00000008, d17, piece 0x00000004
+source_filename = "simd.ll"
+target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
+target triple = "armv7-apple-ios7.0"
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #0
+
+define <3 x float> @_TFV4simd8float2x3g9subscriptFSiVS_6float3(i32, <3 x float>, <3 x float>) !dbg !5 {
+entry:
+ tail call void @llvm.dbg.value(metadata <3 x float> %1, i64 0, metadata !8, metadata !9), !dbg !10
+ tail call void @llvm.dbg.value(metadata <3 x float> %2, i64 0, metadata !8, metadata !11), !dbg !10
+ %3 = icmp eq i32 %0, 0, !dbg !12
+ br i1 %3, label %7, label %4, !dbg !12
+
+; <label>:4: ; preds = %entry
+ %5 = icmp eq i32 %0, 1, !dbg !15
+ br i1 %5, label %7, label %6, !dbg !15
+
+; <label>:6: ; preds = %4
+ unreachable, !dbg !17
+
+; <label>:7: ; preds = %4, %entry
+ %8 = phi <3 x float> [ %1, %entry ], [ %2, %4 ], !dbg !18
+ ret <3 x float> %8, !dbg !18
+}
+
+attributes #0 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_Swift, file: !1, producer: "Swift", isOptimized: false, runtimeVersion: 3, emissionKind: FullDebug, enums: !2, imports: !2)
+!1 = !DIFile(filename: "simd.swift", directory: "/")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = distinct !DISubprogram(name: "subscript.get", linkageName: "_TFV4simd8float2x3g9subscriptFSiVS_6float3", scope: !6, file: !1, type: !7, isLocal: false, isDefinition: true, isOptimized: true, unit: !0, variables: !2)
+!6 = !DICompositeType(tag: DW_TAG_structure_type, name: "float2x3", scope: !0, file: !1, line: 5824, size: 256, align: 128, elements: !2, runtimeLang: DW_LANG_Swift, identifier: "_TtV4simd8float2x3")
+!7 = !DISubroutineType(types: !2)
+!8 = !DILocalVariable(name: "self", arg: 2, scope: !5, file: !1, line: 5897, type: !6, flags: DIFlagArtificial)
+!9 = !DIExpression(DW_OP_LLVM_fragment, 0, 96)
+!10 = !DILocation(line: 5897, column: 5, scope: !5)
+!11 = !DIExpression(DW_OP_LLVM_fragment, 96, 96)
+!12 = !DILocation(line: 5900, column: 12, scope: !13)
+!13 = distinct !DILexicalBlock(scope: !14, file: !1, line: 5898, column: 7)
+!14 = distinct !DILexicalBlock(scope: !5, file: !1, line: 5897, column: 9)
+!15 = !DILocation(line: 5902, column: 12, scope: !16)
+!16 = distinct !DILexicalBlock(scope: !14, file: !1, line: 5898, column: 7)
+!17 = !DILocation(line: 0, scope: !5)
+!18 = !DILocation(line: 5906, column: 5, scope: !14)