Trysomething #143033
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Trysomething #143033
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…ple. Currently, DWARFDataExtractor can extract data without performing relocations, but is coded such that it still depends on all the relocation machinery, like DWARFSections and similar. Extract most functionality into a new base class, DWARFDataExtractorSimple, and have DWARFDataExtractor add the relocation dependent pieces as overrides. This will allow moving DWARFDataExtractorSimple into a new lower-level, lighter-weight library with fewer external dependencies. This is another in a series of refactoring changes to create a new better-layered, lo-level Dwarf library that can be called from lower-level code without circular dependencies.
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@llvm/pr-subscribers-debuginfo Author: None (Sterling-Augustine) Changesasdfas Full diff: https://github.com/llvm/llvm-project/pull/143033.diff 4 Files Affected:
diff --git a/llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractor.h b/llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractor.h
index b86fe593cd52d..f6da96757e290 100644
--- a/llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractor.h
+++ b/llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractor.h
@@ -10,81 +10,60 @@
#define LLVM_DEBUGINFO_DWARF_DWARFDATAEXTRACTOR_H
#include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/DebugInfo/DWARF/DWARFDataExtractorSimple.h"
+#include "llvm/DebugInfo/DWARF/DWARFObject.h"
+#include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
#include "llvm/DebugInfo/DWARF/DWARFSection.h"
#include "llvm/Support/Compiler.h"
-#include "llvm/Support/DataExtractor.h"
namespace llvm {
-class DWARFObject;
-/// A DataExtractor (typically for an in-memory copy of an object-file section)
-/// plus a relocation map for that section, if there is one.
-class DWARFDataExtractor : public DataExtractor {
+/// A DWARFDataExtractor (typically for an in-memory copy of an object-file
+/// section) plus a relocation map for that section, if there is one.
+class DWARFDataExtractor : public DWARFDataExtractorBase<DWARFDataExtractor> {
const DWARFObject *Obj = nullptr;
const DWARFSection *Section = nullptr;
public:
+ using DWARFDataExtractorBase::DWARFDataExtractorBase;
+
/// Constructor for the normal case of extracting data from a DWARF section.
/// The DWARFSection's lifetime must be at least as long as the extractor's.
DWARFDataExtractor(const DWARFObject &Obj, const DWARFSection &Section,
bool IsLittleEndian, uint8_t AddressSize)
- : DataExtractor(Section.Data, IsLittleEndian, AddressSize), Obj(&Obj),
- Section(&Section) {}
-
- /// Constructor for cases when there are no relocations.
- DWARFDataExtractor(StringRef Data, bool IsLittleEndian, uint8_t AddressSize)
- : DataExtractor(Data, IsLittleEndian, AddressSize) {}
- DWARFDataExtractor(ArrayRef<uint8_t> Data, bool IsLittleEndian,
- uint8_t AddressSize)
- : DataExtractor(
- StringRef(reinterpret_cast<const char *>(Data.data()), Data.size()),
- IsLittleEndian, AddressSize) {}
+ : DWARFDataExtractorBase(Section.Data, IsLittleEndian, AddressSize),
+ Obj(&Obj), Section(&Section) {}
/// Truncating constructor
DWARFDataExtractor(const DWARFDataExtractor &Other, size_t Length)
- : DataExtractor(Other.getData().substr(0, Length), Other.isLittleEndian(),
- Other.getAddressSize()),
+ : DWARFDataExtractorBase(Other.getData().substr(0, Length),
+ Other.isLittleEndian(), Other.getAddressSize()),
Obj(Other.Obj), Section(Other.Section) {}
- /// Extracts the DWARF "initial length" field, which can either be a 32-bit
- /// value smaller than 0xfffffff0, or the value 0xffffffff followed by a
- /// 64-bit length. Returns the actual length, and the DWARF format which is
- /// encoded in the field. In case of errors, it returns {0, DWARF32} and
- /// leaves the offset unchanged.
- LLVM_ABI std::pair<uint64_t, dwarf::DwarfFormat>
- getInitialLength(uint64_t *Off, Error *Err = nullptr) const;
-
- std::pair<uint64_t, dwarf::DwarfFormat> getInitialLength(Cursor &C) const {
- return getInitialLength(&getOffset(C), &getError(C));
- }
-
/// Extracts a value and applies a relocation to the result if
/// one exists for the given offset.
- LLVM_ABI uint64_t getRelocatedValue(uint32_t Size, uint64_t *Off,
- uint64_t *SectionIndex = nullptr,
- Error *Err = nullptr) const;
- uint64_t getRelocatedValue(Cursor &C, uint32_t Size,
- uint64_t *SectionIndex = nullptr) const {
- return getRelocatedValue(Size, &getOffset(C), SectionIndex, &getError(C));
- }
+ LLVM_ABI uint64_t getRelocatedValueImpl(uint32_t Size, uint64_t *Off,
+ uint64_t *SecNdx, Error *Err) const {
+ if (SecNdx)
+ *SecNdx = object::SectionedAddress::UndefSection;
+ if (!Section)
+ return getUnsigned(Off, Size, Err);
- /// Extracts an address-sized value and applies a relocation to the result if
- /// one exists for the given offset.
- uint64_t getRelocatedAddress(uint64_t *Off, uint64_t *SecIx = nullptr) const {
- return getRelocatedValue(getAddressSize(), Off, SecIx);
- }
- uint64_t getRelocatedAddress(Cursor &C, uint64_t *SecIx = nullptr) const {
- return getRelocatedValue(getAddressSize(), &getOffset(C), SecIx,
- &getError(C));
- }
+ ErrorAsOutParameter ErrAsOut(Err);
+ std::optional<RelocAddrEntry> E = Obj->find(*Section, *Off);
+ uint64_t LocData = getUnsigned(Off, Size, Err);
+ if (!E || (Err && *Err))
+ return LocData;
+ if (SecNdx)
+ *SecNdx = E->SectionIndex;
- /// Extracts a DWARF-encoded pointer in \p Offset using \p Encoding.
- /// There is a DWARF encoding that uses a PC-relative adjustment.
- /// For these values, \p AbsPosOffset is used to fix them, which should
- /// reflect the absolute address of this pointer.
- LLVM_ABI std::optional<uint64_t>
- getEncodedPointer(uint64_t *Offset, uint8_t Encoding,
- uint64_t AbsPosOffset = 0) const;
+ uint64_t R = object::resolveRelocation(E->Resolver, E->Reloc,
+ E->SymbolValue, LocData);
+ if (E->Reloc2)
+ R = object::resolveRelocation(E->Resolver, *E->Reloc2, E->SymbolValue2,
+ R);
+ return R;
+ }
};
} // end namespace llvm
diff --git a/llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractorSimple.h b/llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractorSimple.h
new file mode 100644
index 0000000000000..c931ad196cc41
--- /dev/null
+++ b/llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractorSimple.h
@@ -0,0 +1,192 @@
+//===- DWARFDataExtractorSimple.h -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Non relocating, low-level dwarf-data extractor. Suitable for use from
+// libraries that cannot have build-time dependencies on relocation providers.
+
+#ifndef LLVM_DEBUGINFO_DWARF_DWARFDATAEXTRACTORSIMPLE_H
+#define LLVM_DEBUGINFO_DWARF_DWARFDATAEXTRACTORSIMPLE_H
+
+#include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/Support/DataExtractor.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/MathExtras.h"
+
+namespace llvm {
+
+/// A DataExtractor suitable use for parsing dwarf from memory. Clients use
+/// Relocator::getRelocatedValueImpl to relocate values as appropriate.
+
+template <class Relocator> class DWARFDataExtractorBase : public DataExtractor {
+
+public:
+ DWARFDataExtractorBase(StringRef Data, bool IsLittleEndian,
+ uint8_t AddressSize)
+ : DataExtractor(Data, IsLittleEndian, AddressSize) {}
+ DWARFDataExtractorBase(ArrayRef<uint8_t> Data, bool IsLittleEndian,
+ uint8_t AddressSize)
+ : DataExtractor(
+ StringRef(reinterpret_cast<const char *>(Data.data()), Data.size()),
+ IsLittleEndian, AddressSize) {}
+
+ /// Truncating constructor
+ DWARFDataExtractorBase(const DWARFDataExtractorBase &Other, size_t Length)
+ : DataExtractor(Other.getData().substr(0, Length), Other.isLittleEndian(),
+ Other.getAddressSize()) {}
+
+ ~DWARFDataExtractorBase() {}
+
+ /// Extracts a value and returns it as adjusted by the Relocator
+ uint64_t getRelocatedValue(uint32_t Size, uint64_t *Off,
+ uint64_t *SectionIndex = nullptr,
+ Error *Err = nullptr) const {
+ return static_cast<const Relocator *>(this)->getRelocatedValueImpl(
+ Size, Off, SectionIndex, Err);
+ }
+ uint64_t getRelocatedValue(Cursor &C, uint32_t Size,
+ uint64_t *SectionIndex = nullptr) const {
+ return getRelocatedValue(Size, &getOffset(C), SectionIndex, &getError(C));
+ }
+
+ /// Extracts an address-sized value.
+ uint64_t getRelocatedAddress(uint64_t *Off, uint64_t *SecIx = nullptr) const {
+ return getRelocatedValue(getAddressSize(), Off, SecIx);
+ }
+ uint64_t getRelocatedAddress(Cursor &C, uint64_t *SecIx = nullptr) const {
+ return getRelocatedValue(getAddressSize(), &getOffset(C), SecIx,
+ &getError(C));
+ }
+
+ /// Extracts the DWARF "initial length" field, which can either be a 32-bit
+ /// value smaller than 0xfffffff0, or the value 0xffffffff followed by a
+ /// 64-bit length. Returns the actual length, and the DWARF format which is
+ /// encoded in the field. In case of errors, it returns {0, DWARF32} and
+ /// leaves the offset unchanged.
+ std::pair<uint64_t, dwarf::DwarfFormat>
+ getInitialLength(uint64_t *Off, Error *Err = nullptr) const {
+ ErrorAsOutParameter ErrAsOut(Err);
+ if (Err && *Err)
+ return {0, dwarf::DWARF32};
+
+ Cursor C(*Off);
+ uint64_t Length = getRelocatedValue(C, 4);
+ dwarf::DwarfFormat Format = dwarf::DWARF32;
+ if (Length == dwarf::DW_LENGTH_DWARF64) {
+ Length = getRelocatedValue(C, 8);
+ Format = dwarf::DWARF64;
+ } else if (Length >= dwarf::DW_LENGTH_lo_reserved) {
+ cantFail(C.takeError());
+ if (Err)
+ *Err = createStringError(
+ std::errc::invalid_argument,
+ "unsupported reserved unit length of value 0x%8.8" PRIx64, Length);
+ return {0, dwarf::DWARF32};
+ }
+
+ if (C) {
+ *Off = C.tell();
+ return {Length, Format};
+ }
+ if (Err)
+ *Err = C.takeError();
+ else
+ consumeError(C.takeError());
+ return {0, dwarf::DWARF32};
+ }
+
+ std::pair<uint64_t, dwarf::DwarfFormat> getInitialLength(Cursor &C) const {
+ return getInitialLength(&getOffset(C), &getError(C));
+ }
+
+ /// Extracts a DWARF-encoded pointer in \p Offset using \p Encoding.
+ /// There is a DWARF encoding that uses a PC-relative adjustment.
+ /// For these values, \p AbsPosOffset is used to fix them, which should
+ /// reflect the absolute address of this pointer.
+ std::optional<uint64_t> getEncodedPointer(uint64_t *Offset, uint8_t Encoding,
+ uint64_t PCRelOffset) const {
+ if (Encoding == dwarf::DW_EH_PE_omit)
+ return std::nullopt;
+
+ uint64_t Result = 0;
+ uint64_t OldOffset = *Offset;
+ // First get value
+ switch (Encoding & 0x0F) {
+ case dwarf::DW_EH_PE_absptr:
+ switch (getAddressSize()) {
+ case 2:
+ case 4:
+ case 8:
+ Result = getUnsigned(Offset, getAddressSize());
+ break;
+ default:
+ return std::nullopt;
+ }
+ break;
+ case dwarf::DW_EH_PE_uleb128:
+ Result = getULEB128(Offset);
+ break;
+ case dwarf::DW_EH_PE_sleb128:
+ Result = getSLEB128(Offset);
+ break;
+ case dwarf::DW_EH_PE_udata2:
+ Result = getUnsigned(Offset, 2);
+ break;
+ case dwarf::DW_EH_PE_udata4:
+ Result = getUnsigned(Offset, 4);
+ break;
+ case dwarf::DW_EH_PE_udata8:
+ Result = getUnsigned(Offset, 8);
+ break;
+ case dwarf::DW_EH_PE_sdata2:
+ Result = getSigned(Offset, 2);
+ break;
+ case dwarf::DW_EH_PE_sdata4:
+ Result = SignExtend64<32>(getRelocatedValue(4, Offset));
+ break;
+ case dwarf::DW_EH_PE_sdata8:
+ Result = getRelocatedValue(8, Offset);
+ break;
+ default:
+ return std::nullopt;
+ }
+ // Then add relative offset, if required
+ switch (Encoding & 0x70) {
+ case dwarf::DW_EH_PE_absptr:
+ // do nothing
+ break;
+ case dwarf::DW_EH_PE_pcrel:
+ Result += PCRelOffset;
+ break;
+ case dwarf::DW_EH_PE_datarel:
+ case dwarf::DW_EH_PE_textrel:
+ case dwarf::DW_EH_PE_funcrel:
+ case dwarf::DW_EH_PE_aligned:
+ default:
+ *Offset = OldOffset;
+ return std::nullopt;
+ }
+
+ return Result;
+ }
+};
+
+class DWARFDataExtractorSimple
+ : public DWARFDataExtractorBase<DWARFDataExtractorSimple> {
+ using DWARFDataExtractorBase::DWARFDataExtractorBase;
+
+ uint64_t getRelocatedValueImpl(uint32_t Size, uint64_t *Off,
+ uint64_t *SectionIndex = nullptr,
+ Error *Err = nullptr) const {
+ assert(SectionIndex == nullptr &&
+ "DWARFDATAExtractorSimple cannot take section indices.");
+ return getUnsigned(Off, Size, Err);
+ }
+};
+
+} // end namespace llvm
+#endif // LLVM_DEBUGINFO_DWARF_DWARFDATAEXTRACTOR_H
diff --git a/llvm/lib/DebugInfo/DWARF/CMakeLists.txt b/llvm/lib/DebugInfo/DWARF/CMakeLists.txt
index c4bacbdc484f5..cc9734f9f22be 100644
--- a/llvm/lib/DebugInfo/DWARF/CMakeLists.txt
+++ b/llvm/lib/DebugInfo/DWARF/CMakeLists.txt
@@ -5,7 +5,6 @@ add_llvm_component_library(LLVMDebugInfoDWARF
DWARFCFIProgram.cpp
DWARFCompileUnit.cpp
DWARFContext.cpp
- DWARFDataExtractor.cpp
DWARFDebugAbbrev.cpp
DWARFDebugAddr.cpp
DWARFDebugArangeSet.cpp
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDataExtractor.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDataExtractor.cpp
deleted file mode 100644
index 97434b3cfab82..0000000000000
--- a/llvm/lib/DebugInfo/DWARF/DWARFDataExtractor.cpp
+++ /dev/null
@@ -1,137 +0,0 @@
-//===- DWARFDataExtractor.cpp ---------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
-#include "llvm/DebugInfo/DWARF/DWARFObject.h"
-#include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
-#include "llvm/Support/Errc.h"
-
-using namespace llvm;
-
-std::pair<uint64_t, dwarf::DwarfFormat>
-DWARFDataExtractor::getInitialLength(uint64_t *Off, Error *Err) const {
- ErrorAsOutParameter ErrAsOut(Err);
- if (Err && *Err)
- return {0, dwarf::DWARF32};
-
- Cursor C(*Off);
- uint64_t Length = getRelocatedValue(C, 4);
- dwarf::DwarfFormat Format = dwarf::DWARF32;
- if (Length == dwarf::DW_LENGTH_DWARF64) {
- Length = getRelocatedValue(C, 8);
- Format = dwarf::DWARF64;
- } else if (Length >= dwarf::DW_LENGTH_lo_reserved) {
- cantFail(C.takeError());
- if (Err)
- *Err = createStringError(
- errc::invalid_argument,
- "unsupported reserved unit length of value 0x%8.8" PRIx64, Length);
- return {0, dwarf::DWARF32};
- }
-
- if (C) {
- *Off = C.tell();
- return {Length, Format};
- }
- if (Err)
- *Err = C.takeError();
- else
- consumeError(C.takeError());
- return {0, dwarf::DWARF32};
-}
-
-uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint64_t *Off,
- uint64_t *SecNdx,
- Error *Err) const {
- if (SecNdx)
- *SecNdx = object::SectionedAddress::UndefSection;
- if (!Section)
- return getUnsigned(Off, Size, Err);
-
- ErrorAsOutParameter ErrAsOut(Err);
- std::optional<RelocAddrEntry> E = Obj->find(*Section, *Off);
- uint64_t LocData = getUnsigned(Off, Size, Err);
- if (!E || (Err && *Err))
- return LocData;
- if (SecNdx)
- *SecNdx = E->SectionIndex;
-
- uint64_t R =
- object::resolveRelocation(E->Resolver, E->Reloc, E->SymbolValue, LocData);
- if (E->Reloc2)
- R = object::resolveRelocation(E->Resolver, *E->Reloc2, E->SymbolValue2, R);
- return R;
-}
-
-std::optional<uint64_t>
-DWARFDataExtractor::getEncodedPointer(uint64_t *Offset, uint8_t Encoding,
- uint64_t PCRelOffset) const {
- if (Encoding == dwarf::DW_EH_PE_omit)
- return std::nullopt;
-
- uint64_t Result = 0;
- uint64_t OldOffset = *Offset;
- // First get value
- switch (Encoding & 0x0F) {
- case dwarf::DW_EH_PE_absptr:
- switch (getAddressSize()) {
- case 2:
- case 4:
- case 8:
- Result = getUnsigned(Offset, getAddressSize());
- break;
- default:
- return std::nullopt;
- }
- break;
- case dwarf::DW_EH_PE_uleb128:
- Result = getULEB128(Offset);
- break;
- case dwarf::DW_EH_PE_sleb128:
- Result = getSLEB128(Offset);
- break;
- case dwarf::DW_EH_PE_udata2:
- Result = getUnsigned(Offset, 2);
- break;
- case dwarf::DW_EH_PE_udata4:
- Result = getUnsigned(Offset, 4);
- break;
- case dwarf::DW_EH_PE_udata8:
- Result = getUnsigned(Offset, 8);
- break;
- case dwarf::DW_EH_PE_sdata2:
- Result = getSigned(Offset, 2);
- break;
- case dwarf::DW_EH_PE_sdata4:
- Result = SignExtend64<32>(getRelocatedValue(4, Offset));
- break;
- case dwarf::DW_EH_PE_sdata8:
- Result = getRelocatedValue(8, Offset);
- break;
- default:
- return std::nullopt;
- }
- // Then add relative offset, if required
- switch (Encoding & 0x70) {
- case dwarf::DW_EH_PE_absptr:
- // do nothing
- break;
- case dwarf::DW_EH_PE_pcrel:
- Result += PCRelOffset;
- break;
- case dwarf::DW_EH_PE_datarel:
- case dwarf::DW_EH_PE_textrel:
- case dwarf::DW_EH_PE_funcrel:
- case dwarf::DW_EH_PE_aligned:
- default:
- *Offset = OldOffset;
- return std::nullopt;
- }
-
- return Result;
-}
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asdfas