0c5c7b52f0
The CodeView `S_ARMSWITCHTABLE` debug symbol is used to describe the layout of a jump table, it contains the following information:
* The address of the branch instruction that uses the jump table.
* The address of the jump table.
* The "base" address that the values in the jump table are relative to.
* The type of each entry (absolute pointer, a relative integer, a relative integer that is shifted).
Together this information can be used by debuggers and binary analysis tools to understand what an jump table indirect branch is doing and where it might jump to.
Documentation for the symbol can be found in the Microsoft PDB library dumper: 0fe89a942f/cvdump/dumpsym7.cpp (L5518)
This change adds support to LLVM to emit the `S_ARMSWITCHTABLE` debug symbol as well as to dump it out (for testing purposes).
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D149367
572 lines
17 KiB
C++
572 lines
17 KiB
C++
//===- SymbolRecordMapping.cpp -----------------------------------*- C++-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/CodeView/SymbolRecordMapping.h"
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using namespace llvm;
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using namespace llvm::codeview;
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#define error(X) \
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if (auto EC = X) \
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return EC;
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namespace {
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struct MapGap {
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Error operator()(CodeViewRecordIO &IO, LocalVariableAddrGap &Gap) const {
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error(IO.mapInteger(Gap.GapStartOffset));
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error(IO.mapInteger(Gap.Range));
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return Error::success();
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}
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};
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}
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static Error mapLocalVariableAddrRange(CodeViewRecordIO &IO,
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LocalVariableAddrRange &Range) {
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error(IO.mapInteger(Range.OffsetStart));
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error(IO.mapInteger(Range.ISectStart));
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error(IO.mapInteger(Range.Range));
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return Error::success();
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}
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Error SymbolRecordMapping::visitSymbolBegin(CVSymbol &Record) {
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error(IO.beginRecord(MaxRecordLength - sizeof(RecordPrefix)));
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return Error::success();
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}
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Error SymbolRecordMapping::visitSymbolEnd(CVSymbol &Record) {
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error(IO.padToAlignment(alignOf(Container)));
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error(IO.endRecord());
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, BlockSym &Block) {
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error(IO.mapInteger(Block.Parent));
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error(IO.mapInteger(Block.End));
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error(IO.mapInteger(Block.CodeSize));
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error(IO.mapInteger(Block.CodeOffset));
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error(IO.mapInteger(Block.Segment));
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error(IO.mapStringZ(Block.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, Thunk32Sym &Thunk) {
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error(IO.mapInteger(Thunk.Parent));
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error(IO.mapInteger(Thunk.End));
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error(IO.mapInteger(Thunk.Next));
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error(IO.mapInteger(Thunk.Offset));
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error(IO.mapInteger(Thunk.Segment));
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error(IO.mapInteger(Thunk.Length));
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error(IO.mapEnum(Thunk.Thunk));
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error(IO.mapStringZ(Thunk.Name));
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error(IO.mapByteVectorTail(Thunk.VariantData));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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TrampolineSym &Tramp) {
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error(IO.mapEnum(Tramp.Type));
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error(IO.mapInteger(Tramp.Size));
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error(IO.mapInteger(Tramp.ThunkOffset));
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error(IO.mapInteger(Tramp.TargetOffset));
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error(IO.mapInteger(Tramp.ThunkSection));
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error(IO.mapInteger(Tramp.TargetSection));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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SectionSym &Section) {
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uint8_t Padding = 0;
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error(IO.mapInteger(Section.SectionNumber));
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error(IO.mapInteger(Section.Alignment));
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error(IO.mapInteger(Padding));
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error(IO.mapInteger(Section.Rva));
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error(IO.mapInteger(Section.Length));
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error(IO.mapInteger(Section.Characteristics));
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error(IO.mapStringZ(Section.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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CoffGroupSym &CoffGroup) {
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error(IO.mapInteger(CoffGroup.Size));
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error(IO.mapInteger(CoffGroup.Characteristics));
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error(IO.mapInteger(CoffGroup.Offset));
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error(IO.mapInteger(CoffGroup.Segment));
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error(IO.mapStringZ(CoffGroup.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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BPRelativeSym &BPRel) {
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error(IO.mapInteger(BPRel.Offset));
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error(IO.mapInteger(BPRel.Type));
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error(IO.mapStringZ(BPRel.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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BuildInfoSym &BuildInfo) {
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error(IO.mapInteger(BuildInfo.BuildId));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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CallSiteInfoSym &CallSiteInfo) {
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uint16_t Padding = 0;
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error(IO.mapInteger(CallSiteInfo.CodeOffset));
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error(IO.mapInteger(CallSiteInfo.Segment));
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error(IO.mapInteger(Padding));
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error(IO.mapInteger(CallSiteInfo.Type));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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EnvBlockSym &EnvBlock) {
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uint8_t Reserved = 0;
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error(IO.mapInteger(Reserved));
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error(IO.mapStringZVectorZ(EnvBlock.Fields));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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FileStaticSym &FileStatic) {
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error(IO.mapInteger(FileStatic.Index));
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error(IO.mapInteger(FileStatic.ModFilenameOffset));
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error(IO.mapEnum(FileStatic.Flags));
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error(IO.mapStringZ(FileStatic.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, ExportSym &Export) {
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error(IO.mapInteger(Export.Ordinal));
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error(IO.mapEnum(Export.Flags));
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error(IO.mapStringZ(Export.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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Compile2Sym &Compile2) {
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error(IO.mapEnum(Compile2.Flags));
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error(IO.mapEnum(Compile2.Machine));
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error(IO.mapInteger(Compile2.VersionFrontendMajor));
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error(IO.mapInteger(Compile2.VersionFrontendMinor));
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error(IO.mapInteger(Compile2.VersionFrontendBuild));
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error(IO.mapInteger(Compile2.VersionBackendMajor));
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error(IO.mapInteger(Compile2.VersionBackendMinor));
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error(IO.mapInteger(Compile2.VersionBackendBuild));
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error(IO.mapStringZ(Compile2.Version));
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error(IO.mapStringZVectorZ(Compile2.ExtraStrings));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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Compile3Sym &Compile3) {
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error(IO.mapEnum(Compile3.Flags));
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error(IO.mapEnum(Compile3.Machine));
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error(IO.mapInteger(Compile3.VersionFrontendMajor));
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error(IO.mapInteger(Compile3.VersionFrontendMinor));
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error(IO.mapInteger(Compile3.VersionFrontendBuild));
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error(IO.mapInteger(Compile3.VersionFrontendQFE));
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error(IO.mapInteger(Compile3.VersionBackendMajor));
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error(IO.mapInteger(Compile3.VersionBackendMinor));
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error(IO.mapInteger(Compile3.VersionBackendBuild));
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error(IO.mapInteger(Compile3.VersionBackendQFE));
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error(IO.mapStringZ(Compile3.Version));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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ConstantSym &Constant) {
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error(IO.mapInteger(Constant.Type));
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error(IO.mapEncodedInteger(Constant.Value));
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error(IO.mapStringZ(Constant.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, DataSym &Data) {
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error(IO.mapInteger(Data.Type));
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error(IO.mapInteger(Data.DataOffset));
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error(IO.mapInteger(Data.Segment));
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error(IO.mapStringZ(Data.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(
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CVSymbol &CVR, DefRangeFramePointerRelSym &DefRangeFramePointerRel) {
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error(IO.mapObject(DefRangeFramePointerRel.Hdr.Offset));
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error(mapLocalVariableAddrRange(IO, DefRangeFramePointerRel.Range));
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error(IO.mapVectorTail(DefRangeFramePointerRel.Gaps, MapGap()));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(
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CVSymbol &CVR,
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DefRangeFramePointerRelFullScopeSym &DefRangeFramePointerRelFullScope) {
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error(IO.mapInteger(DefRangeFramePointerRelFullScope.Offset));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(
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CVSymbol &CVR, DefRangeRegisterRelSym &DefRangeRegisterRel) {
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error(IO.mapObject(DefRangeRegisterRel.Hdr.Register));
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error(IO.mapObject(DefRangeRegisterRel.Hdr.Flags));
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error(IO.mapObject(DefRangeRegisterRel.Hdr.BasePointerOffset));
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error(mapLocalVariableAddrRange(IO, DefRangeRegisterRel.Range));
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error(IO.mapVectorTail(DefRangeRegisterRel.Gaps, MapGap()));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(
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CVSymbol &CVR, DefRangeRegisterSym &DefRangeRegister) {
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error(IO.mapObject(DefRangeRegister.Hdr.Register));
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error(IO.mapObject(DefRangeRegister.Hdr.MayHaveNoName));
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error(mapLocalVariableAddrRange(IO, DefRangeRegister.Range));
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error(IO.mapVectorTail(DefRangeRegister.Gaps, MapGap()));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(
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CVSymbol &CVR, DefRangeSubfieldRegisterSym &DefRangeSubfieldRegister) {
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error(IO.mapObject(DefRangeSubfieldRegister.Hdr.Register));
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error(IO.mapObject(DefRangeSubfieldRegister.Hdr.MayHaveNoName));
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error(IO.mapObject(DefRangeSubfieldRegister.Hdr.OffsetInParent));
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error(mapLocalVariableAddrRange(IO, DefRangeSubfieldRegister.Range));
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error(IO.mapVectorTail(DefRangeSubfieldRegister.Gaps, MapGap()));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(
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CVSymbol &CVR, DefRangeSubfieldSym &DefRangeSubfield) {
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error(IO.mapInteger(DefRangeSubfield.Program));
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error(IO.mapInteger(DefRangeSubfield.OffsetInParent));
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error(mapLocalVariableAddrRange(IO, DefRangeSubfield.Range));
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error(IO.mapVectorTail(DefRangeSubfield.Gaps, MapGap()));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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DefRangeSym &DefRange) {
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error(IO.mapInteger(DefRange.Program));
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error(mapLocalVariableAddrRange(IO, DefRange.Range));
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error(IO.mapVectorTail(DefRange.Gaps, MapGap()));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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FrameCookieSym &FrameCookie) {
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error(IO.mapInteger(FrameCookie.CodeOffset));
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error(IO.mapInteger(FrameCookie.Register));
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error(IO.mapEnum(FrameCookie.CookieKind));
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error(IO.mapInteger(FrameCookie.Flags));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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FrameProcSym &FrameProc) {
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error(IO.mapInteger(FrameProc.TotalFrameBytes));
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error(IO.mapInteger(FrameProc.PaddingFrameBytes));
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error(IO.mapInteger(FrameProc.OffsetToPadding));
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error(IO.mapInteger(FrameProc.BytesOfCalleeSavedRegisters));
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error(IO.mapInteger(FrameProc.OffsetOfExceptionHandler));
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error(IO.mapInteger(FrameProc.SectionIdOfExceptionHandler));
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error(IO.mapEnum(FrameProc.Flags));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(
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CVSymbol &CVR, HeapAllocationSiteSym &HeapAllocSite) {
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error(IO.mapInteger(HeapAllocSite.CodeOffset));
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error(IO.mapInteger(HeapAllocSite.Segment));
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error(IO.mapInteger(HeapAllocSite.CallInstructionSize));
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error(IO.mapInteger(HeapAllocSite.Type));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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InlineSiteSym &InlineSite) {
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error(IO.mapInteger(InlineSite.Parent));
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error(IO.mapInteger(InlineSite.End));
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error(IO.mapInteger(InlineSite.Inlinee));
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error(IO.mapByteVectorTail(InlineSite.AnnotationData));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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RegisterSym &Register) {
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error(IO.mapInteger(Register.Index));
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error(IO.mapEnum(Register.Register));
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error(IO.mapStringZ(Register.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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PublicSym32 &Public) {
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error(IO.mapEnum(Public.Flags));
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error(IO.mapInteger(Public.Offset));
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error(IO.mapInteger(Public.Segment));
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error(IO.mapStringZ(Public.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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ProcRefSym &ProcRef) {
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error(IO.mapInteger(ProcRef.SumName));
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error(IO.mapInteger(ProcRef.SymOffset));
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error(IO.mapInteger(ProcRef.Module));
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error(IO.mapStringZ(ProcRef.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, LabelSym &Label) {
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error(IO.mapInteger(Label.CodeOffset));
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error(IO.mapInteger(Label.Segment));
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error(IO.mapEnum(Label.Flags));
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error(IO.mapStringZ(Label.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, LocalSym &Local) {
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error(IO.mapInteger(Local.Type));
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error(IO.mapEnum(Local.Flags));
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error(IO.mapStringZ(Local.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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ObjNameSym &ObjName) {
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error(IO.mapInteger(ObjName.Signature));
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error(IO.mapStringZ(ObjName.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, ProcSym &Proc) {
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error(IO.mapInteger(Proc.Parent));
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error(IO.mapInteger(Proc.End));
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error(IO.mapInteger(Proc.Next));
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error(IO.mapInteger(Proc.CodeSize));
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error(IO.mapInteger(Proc.DbgStart));
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error(IO.mapInteger(Proc.DbgEnd));
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error(IO.mapInteger(Proc.FunctionType));
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error(IO.mapInteger(Proc.CodeOffset));
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error(IO.mapInteger(Proc.Segment));
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error(IO.mapEnum(Proc.Flags));
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error(IO.mapStringZ(Proc.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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ScopeEndSym &ScopeEnd) {
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, CallerSym &Caller) {
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error(IO.mapVectorN<uint32_t>(
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Caller.Indices,
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[](CodeViewRecordIO &IO, TypeIndex &N) { return IO.mapInteger(N); }));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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RegRelativeSym &RegRel) {
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error(IO.mapInteger(RegRel.Offset));
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error(IO.mapInteger(RegRel.Type));
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error(IO.mapEnum(RegRel.Register));
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error(IO.mapStringZ(RegRel.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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ThreadLocalDataSym &Data) {
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error(IO.mapInteger(Data.Type));
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error(IO.mapInteger(Data.DataOffset));
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error(IO.mapInteger(Data.Segment));
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error(IO.mapStringZ(Data.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, UDTSym &UDT) {
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error(IO.mapInteger(UDT.Type));
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error(IO.mapStringZ(UDT.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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UsingNamespaceSym &UN) {
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error(IO.mapStringZ(UN.Name));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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AnnotationSym &Annot) {
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error(IO.mapInteger(Annot.CodeOffset));
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error(IO.mapInteger(Annot.Segment));
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error(IO.mapVectorN<uint16_t>(
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Annot.Strings,
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[](CodeViewRecordIO &IO, StringRef &S) { return IO.mapStringZ(S); }));
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return Error::success();
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}
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Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
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JumpTableSym &JumpTable) {
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error(IO.mapInteger(JumpTable.BaseOffset));
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error(IO.mapInteger(JumpTable.BaseSegment));
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error(IO.mapEnum(JumpTable.SwitchType));
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error(IO.mapInteger(JumpTable.BranchOffset));
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error(IO.mapInteger(JumpTable.TableOffset));
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error(IO.mapInteger(JumpTable.BranchSegment));
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error(IO.mapInteger(JumpTable.TableSegment));
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error(IO.mapInteger(JumpTable.EntriesCount));
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return Error::success();
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}
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RegisterId codeview::decodeFramePtrReg(EncodedFramePtrReg EncodedReg,
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CPUType CPU) {
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assert(unsigned(EncodedReg) < 4);
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switch (CPU) {
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// FIXME: Add ARM and AArch64 variants here.
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default:
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break;
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case CPUType::Intel8080:
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case CPUType::Intel8086:
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|
case CPUType::Intel80286:
|
|
case CPUType::Intel80386:
|
|
case CPUType::Intel80486:
|
|
case CPUType::Pentium:
|
|
case CPUType::PentiumPro:
|
|
case CPUType::Pentium3:
|
|
switch (EncodedReg) {
|
|
case EncodedFramePtrReg::None: return RegisterId::NONE;
|
|
case EncodedFramePtrReg::StackPtr: return RegisterId::VFRAME;
|
|
case EncodedFramePtrReg::FramePtr: return RegisterId::EBP;
|
|
case EncodedFramePtrReg::BasePtr: return RegisterId::EBX;
|
|
}
|
|
llvm_unreachable("bad encoding");
|
|
case CPUType::X64:
|
|
switch (EncodedReg) {
|
|
case EncodedFramePtrReg::None: return RegisterId::NONE;
|
|
case EncodedFramePtrReg::StackPtr: return RegisterId::RSP;
|
|
case EncodedFramePtrReg::FramePtr: return RegisterId::RBP;
|
|
case EncodedFramePtrReg::BasePtr: return RegisterId::R13;
|
|
}
|
|
llvm_unreachable("bad encoding");
|
|
}
|
|
return RegisterId::NONE;
|
|
}
|
|
|
|
EncodedFramePtrReg codeview::encodeFramePtrReg(RegisterId Reg, CPUType CPU) {
|
|
switch (CPU) {
|
|
// FIXME: Add ARM and AArch64 variants here.
|
|
default:
|
|
break;
|
|
case CPUType::Intel8080:
|
|
case CPUType::Intel8086:
|
|
case CPUType::Intel80286:
|
|
case CPUType::Intel80386:
|
|
case CPUType::Intel80486:
|
|
case CPUType::Pentium:
|
|
case CPUType::PentiumPro:
|
|
case CPUType::Pentium3:
|
|
switch (Reg) {
|
|
case RegisterId::VFRAME:
|
|
return EncodedFramePtrReg::StackPtr;
|
|
case RegisterId::EBP:
|
|
return EncodedFramePtrReg::FramePtr;
|
|
case RegisterId::EBX:
|
|
return EncodedFramePtrReg::BasePtr;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case CPUType::X64:
|
|
switch (Reg) {
|
|
case RegisterId::RSP:
|
|
return EncodedFramePtrReg::StackPtr;
|
|
case RegisterId::RBP:
|
|
return EncodedFramePtrReg::FramePtr;
|
|
case RegisterId::R13:
|
|
return EncodedFramePtrReg::BasePtr;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return EncodedFramePtrReg::None;
|
|
}
|