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[llvm-dwarfdump] - Add the support of parsing .debug_loclists.

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This teaches llvm-dwarfdump to dump the content of .debug_loclists sections.

It converts the DWARFDebugLocDWO class to DWARFDebugLoclists,
teaches llvm-dwarfdump about .debug_loclists section and
adds the implementation for parsing the DW_LLE_offset_pair entries.

Differential revision: https://reviews.llvm.org/D53364

llvm-svn: 344895
This commit is contained in:
George Rimar 2018-10-22 11:30:54 +00:00
parent 12522d8b68
commit 4392ace2e7
8 changed files with 288 additions and 36 deletions
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1
include/llvm/BinaryFormat/Dwarf.def
View File

@ -873,6 +873,7 @@ HANDLE_DWARF_SECTION(DebugTypes, ".debug_types", "debug-types")
HANDLE_DWARF_SECTION(DebugLine, ".debug_line", "debug-line")
HANDLE_DWARF_SECTION(DebugLineStr, ".debug_line_str", "debug-line-str")
HANDLE_DWARF_SECTION(DebugLoc, ".debug_loc", "debug-loc")
HANDLE_DWARF_SECTION(DebugLoclists, ".debug_loclists", "debug-loclists")
HANDLE_DWARF_SECTION(DebugFrame, ".debug_frame", "debug-frame")
HANDLE_DWARF_SECTION(DebugMacro, ".debug_macro", "debug-macro")
HANDLE_DWARF_SECTION(DebugNames, ".debug_names", "debug-names")

4
include/llvm/DebugInfo/DWARF/DWARFContext.h
View File

@ -76,7 +76,7 @@ class DWARFContext : public DIContext {
DWARFUnitVector DWOUnits;
std::unique_ptr<DWARFDebugAbbrev> AbbrevDWO;
std::unique_ptr<DWARFDebugLocDWO> LocDWO;
std::unique_ptr<DWARFDebugLoclists> LocDWO;
/// The maximum DWARF version of all units.
unsigned MaxVersion = 0;
@ -262,7 +262,7 @@ public:
const DWARFDebugAbbrev *getDebugAbbrevDWO();
/// Get a pointer to the parsed DebugLoc object.
const DWARFDebugLocDWO *getDebugLocDWO();
const DWARFDebugLoclists *getDebugLocDWO();
/// Get a pointer to the parsed DebugAranges object.
const DWARFDebugAranges *getDebugAranges();

14
include/llvm/DebugInfo/DWARF/DWARFDebugLoc.h
View File

@ -73,19 +73,21 @@ public:
uint32_t *Offset);
};
class DWARFDebugLocDWO {
class DWARFDebugLoclists {
public:
struct Entry {
uint64_t Start;
uint32_t Length;
uint8_t Kind;
uint64_t Value0;
uint64_t Value1;
SmallVector<char, 4> Loc;
};
struct LocationList {
unsigned Offset;
SmallVector<Entry, 2> Entries;
void dump(raw_ostream &OS, bool IsLittleEndian, unsigned AddressSize,
const MCRegisterInfo *RegInfo, unsigned Indent) const;
void dump(raw_ostream &OS, uint64_t BaseAddr, bool IsLittleEndian,
unsigned AddressSize, const MCRegisterInfo *RegInfo,
unsigned Indent) const;
};
private:
@ -99,7 +101,7 @@ private:
public:
void parse(DataExtractor data);
void dump(raw_ostream &OS, const MCRegisterInfo *RegInfo,
void dump(raw_ostream &OS, uint64_t BaseAddr, const MCRegisterInfo *RegInfo,
Optional<uint64_t> Offset) const;
/// Return the location list at the given offset or nullptr.

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

@ -38,6 +38,7 @@ public:
forEachTypesSections(function_ref<void(const DWARFSection &)> F) const {}
virtual StringRef getAbbrevSection() const { return ""; }
virtual const DWARFSection &getLocSection() const { return Dummy; }
virtual const DWARFSection &getLoclistsSection() const { return Dummy; }
virtual StringRef getARangeSection() const { return ""; }
virtual StringRef getDebugFrameSection() const { return ""; }
virtual StringRef getEHFrameSection() const { return ""; }

36
lib/DebugInfo/DWARF/DWARFContext.cpp
View File

@ -292,6 +292,27 @@ dumpRnglistsSection(raw_ostream &OS, DWARFDataExtractor &rnglistData,
}
}
static void dumpLoclistsSection(raw_ostream &OS, DIDumpOptions DumpOpts,
DWARFDataExtractor Data,
const MCRegisterInfo *MRI,
Optional<uint64_t> DumpOffset) {
uint32_t Offset = 0;
DWARFDebugLoclists Loclists;
DWARFListTableHeader Header(".debug_loclists", "locations");
if (Error E = Header.extract(Data, &Offset)) {
WithColor::error() << toString(std::move(E)) << '\n';
return;
}
Header.dump(OS, DumpOpts);
DataExtractor LocData(Data.getData().drop_front(Offset),
Data.isLittleEndian(), Header.getAddrSize());
Loclists.parse(LocData);
Loclists.dump(OS, 0, MRI, DumpOffset);
}
void DWARFContext::dump(
raw_ostream &OS, DIDumpOptions DumpOpts,
std::array<Optional<uint64_t>, DIDT_ID_Count> DumpOffsets) {
@ -366,9 +387,15 @@ void DWARFContext::dump(
DObj->getLocSection().Data)) {
getDebugLoc()->dump(OS, getRegisterInfo(), DumpOffset);
}
if (shouldDump(Explicit, ".debug_loclists", DIDT_ID_DebugLoclists,
DObj->getLoclistsSection().Data)) {
DWARFDataExtractor Data(*DObj, DObj->getLoclistsSection(), isLittleEndian(),
0);
dumpLoclistsSection(OS, DumpOpts, Data, getRegisterInfo(), DumpOffset);
}
if (shouldDump(ExplicitDWO, ".debug_loc.dwo", DIDT_ID_DebugLoc,
DObj->getLocDWOSection().Data)) {
getDebugLocDWO()->dump(OS, getRegisterInfo(), DumpOffset);
getDebugLocDWO()->dump(OS, 0, getRegisterInfo(), DumpOffset);
}
if (shouldDump(Explicit, ".debug_frame", DIDT_ID_DebugFrame,
@ -696,11 +723,11 @@ const DWARFDebugLoc *DWARFContext::getDebugLoc() {
return Loc.get();
}
const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
const DWARFDebugLoclists *DWARFContext::getDebugLocDWO() {
if (LocDWO)
return LocDWO.get();
LocDWO.reset(new DWARFDebugLocDWO());
LocDWO.reset(new DWARFDebugLoclists());
// Assume all compile units have the same address byte size.
// FIXME: We don't need AddressSize for split DWARF since relocatable
// addresses cannot appear there. At the moment DWARFExpression requires it.
@ -1213,6 +1240,7 @@ class DWARFObjInMemory final : public DWARFObject {
DWARFSectionMap InfoSection;
DWARFSectionMap LocSection;
DWARFSectionMap LocListsSection;
DWARFSectionMap LineSection;
DWARFSectionMap RangeSection;
DWARFSectionMap RnglistsSection;
@ -1234,6 +1262,7 @@ class DWARFObjInMemory final : public DWARFObject {
return StringSwitch<DWARFSectionMap *>(Name)
.Case("debug_info", &InfoSection)
.Case("debug_loc", &LocSection)
.Case("debug_loclists", &LocListsSection)
.Case("debug_line", &LineSection)
.Case("debug_str_offsets", &StringOffsetSection)
.Case("debug_ranges", &RangeSection)
@ -1529,6 +1558,7 @@ public:
StringRef getAbbrevSection() const override { return AbbrevSection; }
const DWARFSection &getLocSection() const override { return LocSection; }
const DWARFSection &getLoclistsSection() const override { return LocListsSection; }
StringRef getARangeSection() const override { return ARangeSection; }
StringRef getDebugFrameSection() const override { return DebugFrameSection; }
StringRef getEHFrameSection() const override { return EHFrameSection; }

78
lib/DebugInfo/DWARF/DWARFDebugLoc.cpp
View File

@ -144,24 +144,39 @@ void DWARFDebugLoc::parse(const DWARFDataExtractor &data) {
WithColor::error() << "failed to consume entire .debug_loc section\n";
}
Optional<DWARFDebugLocDWO::LocationList>
DWARFDebugLocDWO::parseOneLocationList(DataExtractor Data, unsigned *Offset) {
Optional<DWARFDebugLoclists::LocationList>
DWARFDebugLoclists::parseOneLocationList(DataExtractor Data, unsigned *Offset) {
LocationList LL;
LL.Offset = *Offset;
// dwarf::DW_LLE_end_of_list_entry is 0 and indicates the end of the list.
while (auto Kind =
static_cast<dwarf::LocationListEntry>(Data.getU8(Offset))) {
if (Kind != dwarf::DW_LLE_startx_length) {
Entry E;
E.Kind = Kind;
switch (Kind) {
case dwarf::DW_LLE_startx_length:
E.Value0 = Data.getULEB128(Offset);
E.Value1 = Data.getU32(Offset);
break;
case dwarf::DW_LLE_start_length:
E.Value0 = Data.getAddress(Offset);
E.Value1 = Data.getULEB128(Offset);
break;
case dwarf::DW_LLE_offset_pair:
E.Value0 = Data.getULEB128(Offset);
E.Value1 = Data.getULEB128(Offset);
break;
case dwarf::DW_LLE_base_address:
E.Value0 = Data.getAddress(Offset);
break;
default:
WithColor::error() << "dumping support for LLE of kind " << (int)Kind
<< " not implemented\n";
return None;
}
Entry E;
E.Start = Data.getULEB128(Offset);
E.Length = Data.getU32(Offset);
unsigned Bytes = Data.getU16(Offset);
// A single location description describing the location of the object...
StringRef str = Data.getData().substr(*Offset, Bytes);
@ -174,7 +189,7 @@ DWARFDebugLocDWO::parseOneLocationList(DataExtractor Data, unsigned *Offset) {
return LL;
}
void DWARFDebugLocDWO::parse(DataExtractor data) {
void DWARFDebugLoclists::parse(DataExtractor data) {
IsLittleEndian = data.isLittleEndian();
AddressSize = data.getAddressSize();
@ -187,8 +202,8 @@ void DWARFDebugLocDWO::parse(DataExtractor data) {
}
}
DWARFDebugLocDWO::LocationList const *
DWARFDebugLocDWO::getLocationListAtOffset(uint64_t Offset) const {
DWARFDebugLoclists::LocationList const *
DWARFDebugLoclists::getLocationListAtOffset(uint64_t Offset) const {
auto It = std::lower_bound(
Locations.begin(), Locations.end(), Offset,
[](const LocationList &L, uint64_t Offset) { return L.Offset < Offset; });
@ -197,23 +212,46 @@ DWARFDebugLocDWO::getLocationListAtOffset(uint64_t Offset) const {
return nullptr;
}
void DWARFDebugLocDWO::LocationList::dump(raw_ostream &OS, bool IsLittleEndian,
unsigned AddressSize,
const MCRegisterInfo *MRI,
unsigned Indent) const {
void DWARFDebugLoclists::LocationList::dump(raw_ostream &OS, uint64_t BaseAddr,
bool IsLittleEndian,
unsigned AddressSize,
const MCRegisterInfo *MRI,
unsigned Indent) const {
for (const Entry &E : Entries) {
OS << '\n';
OS.indent(Indent);
OS << "Addr idx " << E.Start << " (w/ length " << E.Length << "): ";
switch (E.Kind) {
case dwarf::DW_LLE_startx_length:
OS << '\n';
OS.indent(Indent);
OS << "Addr idx " << E.Value0 << " (w/ length " << E.Value1 << "): ";
break;
case dwarf::DW_LLE_start_length:
OS << '\n';
OS.indent(Indent);
OS << format("[0x%8.8x, 0x%8.8x): ", E.Value0, E.Value0 + E.Value1);
break;
case dwarf::DW_LLE_offset_pair:
OS << '\n';
OS.indent(Indent);
OS << format("[0x%8.8x, 0x%8.8x): ", BaseAddr + E.Value0,
BaseAddr + E.Value1);
break;
case dwarf::DW_LLE_base_address:
BaseAddr = E.Value0;
break;
default:
llvm_unreachable("unreachable locations list kind");
}
dumpExpression(OS, E.Loc, IsLittleEndian, AddressSize, MRI);
}
}
void DWARFDebugLocDWO::dump(raw_ostream &OS, const MCRegisterInfo *MRI,
Optional<uint64_t> Offset) const {
void DWARFDebugLoclists::dump(raw_ostream &OS, uint64_t BaseAddr,
const MCRegisterInfo *MRI,
Optional<uint64_t> Offset) const {
auto DumpLocationList = [&](const LocationList &L) {
OS << format("0x%8.8x: ", L.Offset);
L.dump(OS, IsLittleEndian, AddressSize, MRI, /*Indent=*/12);
L.dump(OS, BaseAddr, IsLittleEndian, AddressSize, MRI, /*Indent=*/12);
OS << "\n\n";
};

22
lib/DebugInfo/DWARF/DWARFDie.cpp
View File

@ -102,7 +102,7 @@ static void dumpLocation(raw_ostream &OS, DWARFFormValue &FormValue,
FormValue.dump(OS, DumpOpts);
if (FormValue.isFormClass(DWARFFormValue::FC_SectionOffset)) {
uint32_t Offset = *FormValue.getAsSectionOffset();
if (!U->isDWOUnit()) {
if (!U->isDWOUnit() && !U->getLocSection()->Data.empty()) {
DWARFDebugLoc DebugLoc;
DWARFDataExtractor Data(Obj, *U->getLocSection(), Ctx.isLittleEndian(),
Obj.getAddressSize());
@ -115,11 +115,23 @@ static void dumpLocation(raw_ostream &OS, DWARFFormValue &FormValue,
Indent);
} else
OS << "error extracting location list.";
} else {
DataExtractor Data(U->getLocSectionData(), Ctx.isLittleEndian(), 0);
auto LL = DWARFDebugLocDWO::parseOneLocationList(Data, &Offset);
return;
}
StringRef LoclistsSectionData =
U->isDWOUnit() ? U->getLocSectionData() : Obj.getLoclistsSection().Data;
if (!LoclistsSectionData.empty()) {
DataExtractor Data(LoclistsSectionData, Ctx.isLittleEndian(),
Obj.getAddressSize());
auto LL = DWARFDebugLoclists::parseOneLocationList(Data, &Offset);
uint64_t BaseAddr = 0;
if (Optional<SectionedAddress> BA = U->getBaseAddress())
BaseAddr = BA->Address;
if (LL)
LL->dump(OS, Ctx.isLittleEndian(), Obj.getAddressSize(), MRI, Indent);
LL->dump(OS, BaseAddr, Ctx.isLittleEndian(), Obj.getAddressSize(), MRI,
Indent);
else
OS << "error extracting location list.";
}

168
test/DebugInfo/X86/dwarfdump-debug-loclists.test Normal file
View File

@ -0,0 +1,168 @@
# RUN: llvm-mc %s -filetype obj -triple x86_64-pc-linux -o %t.o
# RUN: llvm-dwarfdump -v %t.o | FileCheck %s
# CHECK: .debug_info
# CHECK: DW_AT_name{{.*}}"stub"
# CHECK: DW_AT_location [DW_FORM_sec_offset] (0x0000000c
# CHECK-NEXT: [0x00000010, 0x00000020): DW_OP_breg5 RDI+0
# CHECK-NEXT: [0x00000530, 0x00000540): DW_OP_breg6 RBP-8, DW_OP_deref
# CHECK-NEXT: [0x00000700, 0x00000710): DW_OP_breg5 RDI+0
# CHECK: .debug_loclists contents:
# CHECK-NEXT: 0x00000000: locations list header: length = 0x00000031, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000000
# CHECK-NEXT: 0x00000000:
# CHECK-NEXT: [0x00000000, 0x00000010): DW_OP_breg5 RDI+0
# CHECK-NEXT: [0x00000530, 0x00000540): DW_OP_breg6 RBP-8, DW_OP_deref
# CHECK-NEXT: [0x00000700, 0x00000710): DW_OP_breg5 RDI+0
.section .debug_str,"MS",@progbits,1
.asciz "stub"
.section .debug_str_offsets,"",@progbits
.long 68
.short 5
.short 0
.Lstr_offsets_base0:
.zero 64
.section .debug_loclists,"",@progbits
.long .Ldebug_loclist_table_end0-.Ldebug_loclist_table_start0
.Ldebug_loclist_table_start0:
.short 5 # Version.
.byte 8 # Address size.
.byte 0 # Segmen selector size.
.long 0 # Offset entry count.
.Lloclists_table_base0:
.Ldebug_loc0:
.byte 4 # DW_LLE_offset_pair
.uleb128 0x0 # starting offset
.uleb128 0x10 # ending offset
.short 2 # Loc expr size
.byte 117 # DW_OP_breg5
.byte 0 # 0
.byte 6 # DW_LLE_base_address
.quad 0x500 # Some address
.short 0 # Loc expr size = 0.
.byte 4 # DW_LLE_offset_pair
.uleb128 0x30 # starting offset
.uleb128 0x40 # ending offset
.short 3 # Loc expr size
.byte 118 # DW_OP_breg6
.byte 120 # -8
.byte 6 # DW_OP_deref
.byte 8 # DW_LLE_start_length
.quad 0x700 # Some address
.uleb128 0x10 # length
.short 2 # Loc expr size
.byte 117 # DW_OP_breg5
.byte 0 # 0
.byte 0 # DW_LLE_end_of_list
.Ldebug_loclist_table_end0:
.section .debug_abbrev,"",@progbits
.byte 1 # Abbreviation Code
.byte 17 # DW_TAG_compile_unit
.byte 1 # DW_CHILDREN_yes
.byte 37 # DW_AT_producer
.byte 37 # DW_FORM_strx1
.byte 19 # DW_AT_language
.byte 5 # DW_FORM_data2
.byte 3 # DW_AT_name
.byte 37 # DW_FORM_strx1
.byte 114 # DW_AT_str_offsets_base
.byte 23 # DW_FORM_sec_offset
.byte 16 # DW_AT_stmt_list
.byte 23 # DW_FORM_sec_offset
.byte 27 # DW_AT_comp_dir
.byte 37 # DW_FORM_strx1
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 18 # DW_AT_high_pc
.byte 6 # DW_FORM_data4
.ascii "\214\001" # DW_AT_loclists_base
.byte 23 # DW_FORM_sec_offset
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 1 # DW_CHILDREN_yes
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 18 # DW_AT_high_pc
.byte 6 # DW_FORM_data4
.byte 64 # DW_AT_frame_base
.byte 24 # DW_FORM_exprloc
.byte 110 # DW_AT_linkage_name
.byte 37 # DW_FORM_strx1
.byte 3 # DW_AT_name
.byte 37 # DW_FORM_strx1
.byte 58 # DW_AT_decl_file
.byte 11 # DW_FORM_data1
.byte 59 # DW_AT_decl_line
.byte 11 # DW_FORM_data1
.byte 63 # DW_AT_external
.byte 25 # DW_FORM_flag_present
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 3 # Abbreviation Code
.byte 52 # DW_TAG_variable
.byte 0 # DW_CHILDREN_no
.byte 2 # DW_AT_location
.byte 23 # DW_FORM_sec_offset
.byte 3 # DW_AT_name
.byte 37 # DW_FORM_strx1
.byte 58 # DW_AT_decl_file
.byte 11 # DW_FORM_data1
.byte 59 # DW_AT_decl_line
.byte 11 # DW_FORM_data1
.byte 73 # DW_AT_type
.byte 19 # DW_FORM_ref4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.Lcu_begin0:
.long 70 # Length of Unit
.short 5 # DWARF version number
.byte 1 # DWARF Unit Type
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 1 # Abbrev [1] 0xc:0xef DW_TAG_compile_unit
.byte 0 # DW_AT_producer
.short 4 # DW_AT_language
.byte 1 # DW_AT_name
.long .Lstr_offsets_base0 # DW_AT_str_offsets_base
.long .Lline_table_start0 # DW_AT_stmt_list
.byte 2 # DW_AT_comp_dir
.quad 0x10 # DW_AT_low_pc
.long 0 # DW_AT_high_pc
.long .Lloclists_table_base0 # DW_AT_loclists_base
.byte 2 # Abbrev [2] 0x2a:0x20 DW_TAG_subprogram
.quad 0 # DW_AT_low_pc
.long 0 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 86
.byte 11 # DW_AT_linkage_name
.byte 12 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 6 # DW_AT_decl_line
# DW_AT_external
.byte 3 # Abbrev [3] 0x40:0xb DW_TAG_variable
.long .Ldebug_loc0 # DW_AT_location
.byte 7 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 6 # DW_AT_decl_line
.long 76 # DW_AT_type
.byte 0 # End Of Children Mark
.byte 0 # End Of Children Mark
.byte 0 # End Of Children Mark
.section .debug_line,"",@progbits
.Lline_table_start0: