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[DWARF v5] Add limited support for dumping .debug_rnglists

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This change adds support to llvm-dwarfdump for dumping DWARF5
.debug_rnglists sections in regular ELF files.

It is not complete, in that several DW_RLE_* encodings are currently
not supported, but does dump the headert and the basic ranges for
DW_RLE_start_length and DW_RLE_start_end encodings.

Obvious next steps are to add verbose dumping that dumps the raw
encodings, rather than the interpreted contents, to add -verify support
of the section (e.g. to show that the correct number of offsets are
specified), add dumping of .debug_rnglists.dwo, and to add support for
other encodings.

Reviewed by: dblaikie, JDevlieghere

Differential Revision: https://reviews.llvm.org/D42481

llvm-svn: 324077
This commit is contained in:
James Henderson 2018-02-02 12:35:52 +00:00
parent 3b193ac13e
commit 2213d809e1
8 changed files with 35 additions and 59 deletions
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3
include/llvm/BinaryFormat/Dwarf.def
View File

@ -845,11 +845,12 @@ HANDLE_DWARF_SECTION(DebugLoc, ".debug_loc", "debug-loc")
HANDLE_DWARF_SECTION(DebugFrame, ".debug_frame", "debug-frame")
HANDLE_DWARF_SECTION(DebugMacro, ".debug_macro", "debug-macro")
HANDLE_DWARF_SECTION(DebugNames, ".debug_names", "debug-names")
HANDLE_DWARF_SECTION(DebugRanges, ".debug_ranges", "debug-ranges")
HANDLE_DWARF_SECTION(DebugPubnames, ".debug_pubnames", "debug-pubnames")
HANDLE_DWARF_SECTION(DebugPubtypes, ".debug_pubtypes", "debug-pubtypes")
HANDLE_DWARF_SECTION(DebugGnuPubnames, ".debug_gnu_pubnames", "debug-gnu-pubnames")
HANDLE_DWARF_SECTION(DebugGnuPubtypes, ".debug_gnu_pubtypes", "debug-gnu-pubtypes")
HANDLE_DWARF_SECTION(DebugRanges, ".debug_ranges", "debug-ranges")
HANDLE_DWARF_SECTION(DebugRnglists, ".debug_rnglists", "debug-rnglists")
HANDLE_DWARF_SECTION(DebugStr, ".debug_str", "debug-str")
HANDLE_DWARF_SECTION(DebugStrOffsets, ".debug_str_offsets", "debug-str-offsets")
HANDLE_DWARF_SECTION(DebugCUIndex, ".debug_cu_index", "debug-cu-index")

45
include/llvm/DebugInfo/DWARF/DWARFDebugRangeList.h
View File

@ -10,8 +10,8 @@
#ifndef LLVM_DEBUGINFO_DWARF_DWARFDEBUGRANGELIST_H
#define LLVM_DEBUGINFO_DWARF_DWARFDEBUGRANGELIST_H
#include "llvm/DebugInfo/DWARF/DWARFAddressRange.h"
#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
#include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
#include <cassert>
#include <cstdint>
#include <vector>
@ -21,49 +21,6 @@ namespace llvm {
struct BaseAddress;
class raw_ostream;
struct DWARFAddressRange {
uint64_t LowPC;
uint64_t HighPC;
uint64_t SectionIndex;
DWARFAddressRange() = default;
/// Used for unit testing.
DWARFAddressRange(uint64_t LowPC, uint64_t HighPC, uint64_t SectionIndex = 0)
: LowPC(LowPC), HighPC(HighPC), SectionIndex(SectionIndex) {}
/// Returns true if LowPC is smaller or equal to HighPC. This accounts for
/// dead-stripped ranges.
bool valid() const { return LowPC <= HighPC; }
/// Returns true if [LowPC, HighPC) intersects with [RHS.LowPC, RHS.HighPC).
bool intersects(const DWARFAddressRange &RHS) const {
// Empty ranges can't intersect.
if (LowPC == HighPC || RHS.LowPC == RHS.HighPC)
return false;
return (LowPC < RHS.HighPC) && (HighPC > RHS.LowPC);
}
/// Returns true if [LowPC, HighPC) fully contains [RHS.LowPC, RHS.HighPC).
bool contains(const DWARFAddressRange &RHS) const {
if (LowPC <= RHS.LowPC && RHS.LowPC <= HighPC)
return LowPC <= RHS.HighPC && RHS.HighPC <= HighPC;
return false;
}
void dump(raw_ostream &OS, uint32_t AddressSize) const;
};
static inline bool operator<(const DWARFAddressRange &LHS,
const DWARFAddressRange &RHS) {
return std::tie(LHS.LowPC, LHS.HighPC) < std::tie(RHS.LowPC, RHS.HighPC);
}
raw_ostream &operator<<(raw_ostream &OS, const DWARFAddressRange &R);
/// DWARFAddressRangesVector - represents a set of absolute address ranges.
using DWARFAddressRangesVector = std::vector<DWARFAddressRange>;
class DWARFDebugRangeList {
public:
struct RangeListEntry {

2
include/llvm/DebugInfo/DWARF/DWARFDie.h
View File

@ -16,9 +16,9 @@
#include "llvm/ADT/iterator_range.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/DWARF/DWARFAddressRange.h"
#include "llvm/DebugInfo/DWARF/DWARFAttribute.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
#include <cassert>
#include <cstdint>
#include <iterator>

1
include/llvm/DebugInfo/DWARF/DWARFObject.h
View File

@ -45,6 +45,7 @@ public:
virtual StringRef getLineStringSection() const { return ""; }
virtual StringRef getStringSection() const { return ""; }
virtual const DWARFSection &getRangeSection() const { return Dummy; }
virtual const DWARFSection &getRnglistsSection() const { return Dummy; }
virtual StringRef getMacinfoSection() const { return ""; }
virtual StringRef getPubNamesSection() const { return ""; }
virtual StringRef getPubTypesSection() const { return ""; }

2
include/llvm/DebugInfo/DWARF/DWARFVerifier.h
View File

@ -11,7 +11,7 @@
#define LLVM_DEBUGINFO_DWARF_DWARFVERIFIER_H
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
#include "llvm/DebugInfo/DWARF/DWARFAddressRange.h"
#include "llvm/DebugInfo/DWARF/DWARFDie.h"
#include <cstdint>

2
lib/DebugInfo/DWARF/CMakeLists.txt
View File

@ -1,5 +1,6 @@
add_llvm_library(LLVMDebugInfoDWARF
DWARFAbbreviationDeclaration.cpp
DWARFAddressRange.cpp
DWARFAcceleratorTable.cpp
DWARFCompileUnit.cpp
DWARFContext.cpp
@ -14,6 +15,7 @@ add_llvm_library(LLVMDebugInfoDWARF
DWARFDebugMacro.cpp
DWARFDebugPubTable.cpp
DWARFDebugRangeList.cpp
DWARFDebugRnglists.cpp
DWARFDie.cpp
DWARFExpression.cpp
DWARFFormValue.cpp

27
lib/DebugInfo/DWARF/DWARFContext.cpp
View File

@ -25,6 +25,7 @@
#include "llvm/DebugInfo/DWARF/DWARFDebugMacro.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugPubTable.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
#include "llvm/DebugInfo/DWARF/DWARFDie.h"
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/DebugInfo/DWARF/DWARFGdbIndex.h"
@ -490,6 +491,27 @@ void DWARFContext::dump(
rangeList.dump(OS);
}
if (shouldDump(Explicit, ".debug_rnglists", DIDT_ID_DebugRnglists,
DObj->getRnglistsSection().Data)) {
DWARFDataExtractor rnglistData(*DObj, DObj->getRnglistsSection(),
isLittleEndian(), 0);
uint32_t Offset = 0;
while (rnglistData.isValidOffset(Offset)) {
DWARFDebugRnglists Rnglists;
uint32_t TableOffset = Offset;
if (Error Err = Rnglists.extract(rnglistData, &Offset)) {
errs() << "error: " + toString(std::move(Err)) << '\n';
uint64_t Length = Rnglists.length();
// Keep going after an error, if we can, assuming that the length field
// could be read. If it couldn't, stop reading the section.
if (Length == 0)
break;
Offset = TableOffset + Length;
} else
Rnglists.dump(OS);
}
}
if (shouldDump(Explicit, ".debug_pubnames", DIDT_ID_DebugPubnames,
DObj->getPubNamesSection()))
DWARFDebugPubTable(DObj->getPubNamesSection(), isLittleEndian(), false)
@ -1164,6 +1186,7 @@ class DWARFObjInMemory final : public DWARFObject {
DWARFSectionMap LocSection;
DWARFSectionMap LineSection;
DWARFSectionMap RangeSection;
DWARFSectionMap RnglistsSection;
DWARFSectionMap StringOffsetSection;
DWARFSectionMap InfoDWOSection;
DWARFSectionMap LineDWOSection;
@ -1184,6 +1207,7 @@ class DWARFObjInMemory final : public DWARFObject {
.Case("debug_line", &LineSection)
.Case("debug_str_offsets", &StringOffsetSection)
.Case("debug_ranges", &RangeSection)
.Case("debug_rnglists", &RnglistsSection)
.Case("debug_info.dwo", &InfoDWOSection)
.Case("debug_loc.dwo", &LocDWOSection)
.Case("debug_line.dwo", &LineDWOSection)
@ -1475,6 +1499,9 @@ public:
const DWARFSection &getLineSection() const override { return LineSection; }
StringRef getStringSection() const override { return StringSection; }
const DWARFSection &getRangeSection() const override { return RangeSection; }
const DWARFSection &getRnglistsSection() const override {
return RnglistsSection;
}
StringRef getMacinfoSection() const override { return MacinfoSection; }
StringRef getPubNamesSection() const override { return PubNamesSection; }
StringRef getPubTypesSection() const override { return PubTypesSection; }

12
lib/DebugInfo/DWARF/DWARFDebugRangeList.cpp
View File

@ -13,21 +13,9 @@
#include "llvm/Support/raw_ostream.h"
#include <cinttypes>
#include <cstdint>
#include <utility>
using namespace llvm;
void DWARFAddressRange::dump(raw_ostream &OS, uint32_t AddressSize) const {
OS << format("[0x%*.*" PRIx64 ", ", AddressSize * 2, AddressSize * 2, LowPC)
<< format(" 0x%*.*" PRIx64 ")", AddressSize * 2, AddressSize * 2, HighPC);
}
raw_ostream &llvm::operator<<(raw_ostream &OS, const DWARFAddressRange &R) {
R.dump(OS, /* AddressSize */ 8);
return OS;
}
void DWARFDebugRangeList::clear() {
Offset = -1U;
AddressSize = 0;