forked from OSchip/llvm-project
[Debuginfo][DW_OP_implicit_pointer] (1/7) Support for DW_OP_LLVM_implicit_pointer
New dwarf operator DW_OP_LLVM_implicit_pointer is introduced (present only in LLVM IR) This operator is required as it is different than DWARF operator DW_OP_implicit_pointer in representation and specification (number and types of operands) and later can not be used as multiple level. Reviewed By: aprantl Differential Revision: https://reviews.llvm.org/D84113
This commit is contained in:
Alok Kumar Sharma
parent
7803636057
commit
104a9f99cc
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@ -5284,6 +5284,33 @@ The current supported opcode vocabulary is limited:
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of the stack. This opcode can be used to calculate bounds of fortran assumed
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rank array which has rank known at run time and current dimension number is
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implicitly first element of the stack.
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- ``DW_OP_LLVM_implicit_pointer`` It specifies the dereferenced value. It can
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be used to represent pointer variables which are optimized out but the value
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it points to is known. This operator is required as it is different than DWARF
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operator DW_OP_implicit_pointer in representation and specification (number
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and types of operands) and later can not be used as multiple level.
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.. code-block:: text
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IR for "*ptr = 4;"
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--------------
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call void @llvm.dbg.value(metadata i32 4, metadata !17, metadata !20)
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!17 = !DILocalVariable(name: "ptr1", scope: !12, file: !3, line: 5,
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type: !18)
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
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!19 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!20 = !DIExpression(DW_OP_LLVM_implicit_pointer))
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IR for "**ptr = 4;"
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--------------
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call void @llvm.dbg.value(metadata i32 4, metadata !17, metadata !21)
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!17 = !DILocalVariable(name: "ptr1", scope: !12, file: !3, line: 5,
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type: !18)
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
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!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !20, size: 64)
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!20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!21 = !DIExpression(DW_OP_LLVM_implicit_pointer,
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DW_OP_LLVM_implicit_pointer))
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DWARF specifies three kinds of simple location descriptions: Register, memory,
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and implicit location descriptions. Note that a location description is
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@ -120,10 +120,11 @@ enum LocationAtom {
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#include "llvm/BinaryFormat/Dwarf.def"
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DW_OP_lo_user = 0xe0,
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DW_OP_hi_user = 0xff,
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DW_OP_LLVM_fragment = 0x1000, ///< Only used in LLVM metadata.
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DW_OP_LLVM_convert = 0x1001, ///< Only used in LLVM metadata.
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DW_OP_LLVM_tag_offset = 0x1002, ///< Only used in LLVM metadata.
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DW_OP_LLVM_entry_value = 0x1003, ///< Only used in LLVM metadata.
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DW_OP_LLVM_fragment = 0x1000, ///< Only used in LLVM metadata.
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DW_OP_LLVM_convert = 0x1001, ///< Only used in LLVM metadata.
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DW_OP_LLVM_tag_offset = 0x1002, ///< Only used in LLVM metadata.
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DW_OP_LLVM_entry_value = 0x1003, ///< Only used in LLVM metadata.
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DW_OP_LLVM_implicit_pointer = 0x1004, ///< Only used in LLVM metadata.
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};
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enum TypeKind : uint8_t {
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@ -151,6 +151,8 @@ StringRef llvm::dwarf::OperationEncodingString(unsigned Encoding) {
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return "DW_OP_LLVM_tag_offset";
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case DW_OP_LLVM_entry_value:
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return "DW_OP_LLVM_entry_value";
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case DW_OP_LLVM_implicit_pointer:
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return "DW_OP_LLVM_implicit_pointer";
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}
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}
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@ -163,6 +165,7 @@ unsigned llvm::dwarf::getOperationEncoding(StringRef OperationEncodingString) {
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.Case("DW_OP_LLVM_fragment", DW_OP_LLVM_fragment)
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.Case("DW_OP_LLVM_tag_offset", DW_OP_LLVM_tag_offset)
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.Case("DW_OP_LLVM_entry_value", DW_OP_LLVM_entry_value)
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.Case("DW_OP_LLVM_implicit_pointer", DW_OP_LLVM_implicit_pointer)
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.Default(0);
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}
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@ -1114,6 +1114,7 @@ bool DIExpression::isValid() const {
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return I->get() == expr_op_begin()->get() && I->getArg(0) == 1 &&
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getNumElements() == 2;
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}
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case dwarf::DW_OP_LLVM_implicit_pointer:
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case dwarf::DW_OP_LLVM_convert:
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case dwarf::DW_OP_LLVM_tag_offset:
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case dwarf::DW_OP_constu:
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@ -0,0 +1,87 @@
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; Round trip test for DW_OP_LLVM_implicit_pointer metadata
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; RUN: llvm-as < %s | llvm-dis | FileCheck %s
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;---------------------------
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;static const char *b = "opq";
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;volatile int v;
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;int main() {
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; int var = 4;
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; int *ptr1;
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; int **ptr2;
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;
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; v++;
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; ptr1 = &var;
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; ptr2 = &ptr1;
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; v++;
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;
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; return *ptr1 - 5 + **ptr2;
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;}
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;---------------------------
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; ModuleID = 'LLVM_implicit_pointer.c'
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source_filename = "LLVM_implicit_pointer.c"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@v = dso_local global i32 0, align 4, !dbg !0
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; Function Attrs: nofree norecurse nounwind uwtable
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define dso_local i32 @main() local_unnamed_addr !dbg !12 {
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entry:
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; CHECK: call void @llvm.dbg.value(metadata i32 4, metadata [[VAR:![0-9]+]], metadata !DIExpression())
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call void @llvm.dbg.value(metadata i32 4, metadata !16, metadata !DIExpression()), !dbg !21
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%0 = load volatile i32, i32* @v, align 4, !dbg !22, !tbaa !23
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%inc = add nsw i32 %0, 1, !dbg !22
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store volatile i32 %inc, i32* @v, align 4, !dbg !22, !tbaa !23
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; CHECK: call void @llvm.dbg.value(metadata i32 4, metadata [[PTR1:![0-9]+]], metadata !DIExpression(DW_OP_LLVM_implicit_pointer))
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call void @llvm.dbg.value(metadata i32 4, metadata !17, metadata !DIExpression(DW_OP_LLVM_implicit_pointer)), !dbg !21
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; CHECK: call void @llvm.dbg.value(metadata i32 4, metadata [[PTR2:![0-9]+]], metadata !DIExpression(DW_OP_LLVM_implicit_pointer, DW_OP_LLVM_implicit_pointer))
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call void @llvm.dbg.value(metadata i32 4, metadata !19, metadata !DIExpression(DW_OP_LLVM_implicit_pointer, DW_OP_LLVM_implicit_pointer)), !dbg !21
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%1 = load volatile i32, i32* @v, align 4, !dbg !27, !tbaa !23
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%inc1 = add nsw i32 %1, 1, !dbg !27
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store volatile i32 %inc1, i32* @v, align 4, !dbg !27, !tbaa !23
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ret i32 3, !dbg !28
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}
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; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!8, !9, !10}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "v", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
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!3 = !DIFile(filename: "LLVM_implicit_pointer.c", directory: "/dir", checksumkind: CSK_MD5, checksum: "218aaa8dc9f04b056b56d944d06383dd")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
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!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!8 = !{i32 7, !"Dwarf Version", i32 5}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{i32 1, !"wchar_size", i32 4}
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!11 = !{!"clang version 12.0.0"}
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!12 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 3, type: !13, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !15)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!7}
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!15 = !{!16, !17, !19}
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; CHECK: [[VAR]] = !DILocalVariable(name: "var"
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!16 = !DILocalVariable(name: "var", scope: !12, file: !3, line: 4, type: !7)
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; CHECK: [[PTR1]] = !DILocalVariable(name: "ptr1"
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!17 = !DILocalVariable(name: "ptr1", scope: !12, file: !3, line: 5, type: !18)
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
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; CHECK: [[PTR2]] = !DILocalVariable(name: "ptr2"
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!19 = !DILocalVariable(name: "ptr2", scope: !12, file: !3, line: 6, type: !20)
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!20 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64)
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!21 = !DILocation(line: 0, scope: !12)
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!22 = !DILocation(line: 8, column: 4, scope: !12)
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!23 = !{!24, !24, i64 0}
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!24 = !{!"int", !25, i64 0}
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!25 = !{!"omnipotent char", !26, i64 0}
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!26 = !{!"Simple C/C++ TBAA"}
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!27 = !DILocation(line: 11, column: 4, scope: !12)
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!28 = !DILocation(line: 13, column: 3, scope: !12)
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