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Dwarf5 fixes [4 of 5]: Skip processing Dwarf5 type units.

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Fourth of 5 small patches to fix various breakpad issues found
while testing dump_syms on DWARF v5 in ChromeOS.

Dwarfv5 adds many new Type Unit sections to debug information. Since
these only contain type information, they are of no interest to
dump_syms.  This CL gets dump_syms to skip trying to process the
type unit sections.  Without this CL, dump_syms takes ~ 3 hours to
process the DWARF v5 Chrome binary.  With this CL, dump_syms takes
~ 8 minutes to process the DWARF v5 Chrome binary (about the same
time as it takes for DWARF v4).

This CL also adds a test case to verify that type units are being
skipped.

Change-Id: Ie0bb2d675718f7041b8e9b3186ed44f80a3ad39c
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2634549
Reviewed-by: Sterling Augustine <saugustine@google.com>
This commit is contained in:
Caroline Tice 2021-01-16 17:05:32 -08:00 committed by Sterling Augustine
parent 646f0f4920
commit 3c528da94c
4 changed files with 128 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/common/dwarf/dwarf2reader.cc
View File

@ -74,7 +74,7 @@ CompilationUnit::CompilationUnit(const string& path,
line_string_buffer_(NULL), line_string_buffer_length_(0),
str_offsets_buffer_(NULL), str_offsets_buffer_length_(0),
addr_buffer_(NULL), addr_buffer_length_(0),
is_split_dwarf_(false), dwo_id_(0), dwo_name_(),
is_split_dwarf_(false), is_type_unit_(false), dwo_id_(0), dwo_name_(),
skeleton_dwo_id_(0), ranges_base_(0), addr_base_(0),
str_offsets_base_(0), have_checked_for_dwp_(false), dwp_path_(),
dwp_byte_reader_(), dwp_reader_() {}
@ -358,6 +358,7 @@ void CompilationUnit::ReadHeader() {
break;
case DW_UT_type:
case DW_UT_split_type:
is_type_unit_ = true;
headerptr += ReadTypeSignature(headerptr);
headerptr += ReadTypeOffset(headerptr);
break;
@ -404,6 +405,8 @@ uint64_t CompilationUnit::Start() {
header_.length,
header_.version))
return ourlength;
else if (header_.version == 5 && is_type_unit_)
return ourlength;
// Otherwise, continue by reading our abbreviation entries.
ReadAbbrevs();

3
src/common/dwarf/dwarf2reader.h
View File

@ -714,6 +714,9 @@ class CompilationUnit {
// associated with the skeleton compilation unit.
bool is_split_dwarf_;
// Flag indicating if it's a Type Unit (only applicable to DWARF v5).
bool is_type_unit_;
// The value of the DW_AT_GNU_dwo_id attribute, if any.
uint64_t dwo_id_;

168
src/common/dwarf/dwarf2reader_die_unittest.cc
View File

@ -152,13 +152,15 @@ struct DIEFixture {
struct DwarfHeaderParams {
DwarfHeaderParams(Endianness endianness, size_t format_size,
int version, size_t address_size)
int version, size_t address_size, int header_type)
: endianness(endianness), format_size(format_size),
version(version), address_size(address_size) { }
version(version), address_size(address_size), header_type(header_type)
{ }
Endianness endianness;
size_t format_size; // 4-byte or 8-byte DWARF offsets
int version;
size_t address_size;
int header_type; // DW_UT_{compile, type, partial, skeleton, etc}
};
class DwarfHeader: public DIEFixture,
@ -175,7 +177,8 @@ TEST_P(DwarfHeader, Header) {
info.set_format_size(GetParam().format_size);
info.set_endianness(GetParam().endianness);
info.Header(GetParam().version, abbrev_table, GetParam().address_size)
info.Header(GetParam().version, abbrev_table, GetParam().address_size,
dwarf2reader::DW_UT_compile)
.ULEB128(1) // DW_TAG_compile_unit, with children
.AppendCString("sam") // DW_AT_name, DW_FORM_string
.D8(0); // end of children
@ -204,36 +207,79 @@ TEST_P(DwarfHeader, Header) {
EXPECT_EQ(parser.Start(), info_contents.size());
}
INSTANTIATE_TEST_SUITE_P(
TEST_P(DwarfHeader, TypeUnitHeader) {
Label abbrev_table = abbrevs.Here();
int version = 5;
abbrevs.Abbrev(1, dwarf2reader::DW_TAG_type_unit,
dwarf2reader::DW_children_yes)
.Attribute(dwarf2reader::DW_AT_name, dwarf2reader::DW_FORM_string)
.EndAbbrev()
.EndTable();
info.set_format_size(GetParam().format_size);
info.set_endianness(GetParam().endianness);
info.Header(version, abbrev_table, GetParam().address_size,
dwarf2reader::DW_UT_type)
.ULEB128(0x41) // DW_TAG_type_unit, with children
.AppendCString("sam") // DW_AT_name, DW_FORM_string
.D8(0); // end of children
info.Finish();
{
InSequence s;
EXPECT_CALL(handler,
StartCompilationUnit(0, GetParam().address_size,
GetParam().format_size, _,
version))
.WillOnce(Return(true));
// If the type unit is handled properly, these calls will be skipped.
EXPECT_CALL(handler, StartDIE(_, dwarf2reader::DW_TAG_type_unit))
.Times(0);
EXPECT_CALL(handler, ProcessAttributeString(_, dwarf2reader::DW_AT_name,
dwarf2reader::DW_FORM_string,
"sam"))
.Times(0);
EXPECT_CALL(handler, EndDIE(_))
.Times(0);
}
ByteReader byte_reader(GetParam().endianness == kLittleEndian ?
ENDIANNESS_LITTLE : ENDIANNESS_BIG);
CompilationUnit parser("", MakeSectionMap(), 0, &byte_reader, &handler);
EXPECT_EQ(parser.Start(), info_contents.size());
}
INSTANTIATE_TEST_CASE_P(
HeaderVariants, DwarfHeader,
::testing::Values(DwarfHeaderParams(kLittleEndian, 4, 2, 4),
DwarfHeaderParams(kLittleEndian, 4, 2, 8),
DwarfHeaderParams(kLittleEndian, 4, 3, 4),
DwarfHeaderParams(kLittleEndian, 4, 3, 8),
DwarfHeaderParams(kLittleEndian, 4, 4, 4),
DwarfHeaderParams(kLittleEndian, 4, 4, 8),
DwarfHeaderParams(kLittleEndian, 8, 2, 4),
DwarfHeaderParams(kLittleEndian, 8, 2, 8),
DwarfHeaderParams(kLittleEndian, 8, 3, 4),
DwarfHeaderParams(kLittleEndian, 8, 3, 8),
DwarfHeaderParams(kLittleEndian, 8, 4, 4),
DwarfHeaderParams(kLittleEndian, 8, 4, 8),
DwarfHeaderParams(kLittleEndian, 8, 5, 4),
DwarfHeaderParams(kLittleEndian, 8, 5, 8),
DwarfHeaderParams(kBigEndian, 4, 2, 4),
DwarfHeaderParams(kBigEndian, 4, 2, 8),
DwarfHeaderParams(kBigEndian, 4, 3, 4),
DwarfHeaderParams(kBigEndian, 4, 3, 8),
DwarfHeaderParams(kBigEndian, 4, 4, 4),
DwarfHeaderParams(kBigEndian, 4, 4, 8),
DwarfHeaderParams(kBigEndian, 8, 2, 4),
DwarfHeaderParams(kBigEndian, 8, 2, 8),
DwarfHeaderParams(kBigEndian, 8, 3, 4),
DwarfHeaderParams(kBigEndian, 8, 3, 8),
DwarfHeaderParams(kBigEndian, 8, 4, 4),
DwarfHeaderParams(kBigEndian, 8, 4, 8),
DwarfHeaderParams(kBigEndian, 8, 5, 4),
DwarfHeaderParams(kBigEndian, 8, 5, 8)));
::testing::Values(DwarfHeaderParams(kLittleEndian, 4, 2, 4, 1),
DwarfHeaderParams(kLittleEndian, 4, 2, 8, 1),
DwarfHeaderParams(kLittleEndian, 4, 3, 4, 1),
DwarfHeaderParams(kLittleEndian, 4, 3, 8, 1),
DwarfHeaderParams(kLittleEndian, 4, 4, 4, 1),
DwarfHeaderParams(kLittleEndian, 4, 4, 8, 1),
DwarfHeaderParams(kLittleEndian, 8, 2, 4, 1),
DwarfHeaderParams(kLittleEndian, 8, 2, 8, 1),
DwarfHeaderParams(kLittleEndian, 8, 3, 4, 1),
DwarfHeaderParams(kLittleEndian, 8, 3, 8, 1),
DwarfHeaderParams(kLittleEndian, 8, 4, 4, 1),
DwarfHeaderParams(kLittleEndian, 8, 4, 8, 1),
DwarfHeaderParams(kLittleEndian, 8, 5, 4, 1),
DwarfHeaderParams(kLittleEndian, 8, 5, 8, 1),
DwarfHeaderParams(kBigEndian, 4, 2, 4, 1),
DwarfHeaderParams(kBigEndian, 4, 2, 8, 1),
DwarfHeaderParams(kBigEndian, 4, 3, 4, 1),
DwarfHeaderParams(kBigEndian, 4, 3, 8, 1),
DwarfHeaderParams(kBigEndian, 4, 4, 4, 1),
DwarfHeaderParams(kBigEndian, 4, 4, 8, 1),
DwarfHeaderParams(kBigEndian, 8, 2, 4, 1),
DwarfHeaderParams(kBigEndian, 8, 2, 8, 1),
DwarfHeaderParams(kBigEndian, 8, 3, 4, 1),
DwarfHeaderParams(kBigEndian, 8, 3, 8, 1),
DwarfHeaderParams(kBigEndian, 8, 4, 4, 1),
DwarfHeaderParams(kBigEndian, 8, 4, 8, 1),
DwarfHeaderParams(kBigEndian, 8, 5, 4, 1),
DwarfHeaderParams(kBigEndian, 8, 5, 8, 1)));
struct DwarfFormsFixture: public DIEFixture {
// Start a compilation unit, as directed by |params|, containing one
@ -253,7 +299,8 @@ struct DwarfFormsFixture: public DIEFixture {
// Create the compilation unit, up to the attribute value.
info.set_format_size(params.format_size);
info.set_endianness(params.endianness);
info.Header(params.version, abbrev_table, params.address_size)
info.Header(params.version, abbrev_table, params.address_size,
dwarf2reader::DW_UT_compile)
.ULEB128(1); // abbrev code
}
@ -560,7 +607,8 @@ TEST_P(DwarfForms, implicit_const) {
info.set_format_size(params.format_size);
info.set_endianness(params.endianness);
info.Header(params.version, abbrev_table, params.address_size)
info.Header(params.version, abbrev_table, params.address_size,
dwarf2reader::DW_UT_compile)
.ULEB128(1); // abbrev code
info.Finish();
@ -578,32 +626,32 @@ TEST_P(DwarfForms, implicit_const) {
// Tests for the other attribute forms could go here.
INSTANTIATE_TEST_SUITE_P(
INSTANTIATE_TEST_CASE_P(
HeaderVariants, DwarfForms,
::testing::Values(DwarfHeaderParams(kLittleEndian, 4, 2, 4),
DwarfHeaderParams(kLittleEndian, 4, 2, 8),
DwarfHeaderParams(kLittleEndian, 4, 3, 4),
DwarfHeaderParams(kLittleEndian, 4, 3, 8),
DwarfHeaderParams(kLittleEndian, 4, 4, 4),
DwarfHeaderParams(kLittleEndian, 4, 4, 8),
DwarfHeaderParams(kLittleEndian, 8, 2, 4),
DwarfHeaderParams(kLittleEndian, 8, 2, 8),
DwarfHeaderParams(kLittleEndian, 8, 3, 4),
DwarfHeaderParams(kLittleEndian, 8, 3, 8),
DwarfHeaderParams(kLittleEndian, 8, 4, 4),
DwarfHeaderParams(kLittleEndian, 8, 4, 8),
DwarfHeaderParams(kBigEndian, 4, 2, 4),
DwarfHeaderParams(kBigEndian, 4, 2, 8),
DwarfHeaderParams(kBigEndian, 4, 3, 4),
DwarfHeaderParams(kBigEndian, 4, 3, 8),
DwarfHeaderParams(kBigEndian, 4, 4, 4),
DwarfHeaderParams(kBigEndian, 4, 4, 8),
DwarfHeaderParams(kBigEndian, 8, 2, 4),
DwarfHeaderParams(kBigEndian, 8, 2, 8),
DwarfHeaderParams(kBigEndian, 8, 3, 4),
DwarfHeaderParams(kBigEndian, 8, 3, 8),
DwarfHeaderParams(kBigEndian, 8, 4, 4),
DwarfHeaderParams(kBigEndian, 8, 4, 8)));
::testing::Values(DwarfHeaderParams(kLittleEndian, 4, 2, 4, 1),
DwarfHeaderParams(kLittleEndian, 4, 2, 8, 1),
DwarfHeaderParams(kLittleEndian, 4, 3, 4, 1),
DwarfHeaderParams(kLittleEndian, 4, 3, 8, 1),
DwarfHeaderParams(kLittleEndian, 4, 4, 4, 1),
DwarfHeaderParams(kLittleEndian, 4, 4, 8, 1),
DwarfHeaderParams(kLittleEndian, 8, 2, 4, 1),
DwarfHeaderParams(kLittleEndian, 8, 2, 8, 1),
DwarfHeaderParams(kLittleEndian, 8, 3, 4, 1),
DwarfHeaderParams(kLittleEndian, 8, 3, 8, 1),
DwarfHeaderParams(kLittleEndian, 8, 4, 4, 1),
DwarfHeaderParams(kLittleEndian, 8, 4, 8, 1),
DwarfHeaderParams(kBigEndian, 4, 2, 4, 1),
DwarfHeaderParams(kBigEndian, 4, 2, 8, 1),
DwarfHeaderParams(kBigEndian, 4, 3, 4, 1),
DwarfHeaderParams(kBigEndian, 4, 3, 8, 1),
DwarfHeaderParams(kBigEndian, 4, 4, 4, 1),
DwarfHeaderParams(kBigEndian, 4, 4, 8, 1),
DwarfHeaderParams(kBigEndian, 8, 2, 4, 1),
DwarfHeaderParams(kBigEndian, 8, 2, 8, 1),
DwarfHeaderParams(kBigEndian, 8, 3, 4, 1),
DwarfHeaderParams(kBigEndian, 8, 3, 8, 1),
DwarfHeaderParams(kBigEndian, 8, 4, 4, 1),
DwarfHeaderParams(kBigEndian, 8, 4, 8, 1)));
class MockRangeListHandler: public dwarf2reader::RangeListHandler {
public:
@ -658,8 +706,10 @@ TEST(RangeList, Dwarf5ReadRangeList) {
using dwarf2reader::DW_RLE_offset_pair;
using dwarf2reader::DW_RLE_end_of_list;
using dwarf2reader::DW_RLE_base_address;
using dwarf2reader::DW_RLE_offset_pair;
using dwarf2reader::DW_RLE_start_end;
using dwarf2reader::DW_RLE_start_length;
using dwarf2reader::DW_RLE_end_of_list;
using dwarf2reader::DW_FORM_sec_offset;
using dwarf2reader::DW_FORM_rnglistx;

13
src/common/dwarf/dwarf2reader_test_common.h
View File

@ -71,7 +71,7 @@ class TestCompilationUnit: public google_breakpad::test_assembler::Section {
// Append a DWARF compilation unit header to the section, with the given
// DWARF version, abbrev table offset, and address size.
TestCompilationUnit& Header(int version, const Label& abbrev_offset,
size_t address_size) {
size_t address_size, int header_type) {
if (format_size_ == 4) {
D32(length_);
} else {
@ -84,9 +84,18 @@ class TestCompilationUnit: public google_breakpad::test_assembler::Section {
SectionOffset(abbrev_offset);
D8(address_size);
} else {
D8(0x01); // DW_UT_compile
D8(header_type); // DW_UT_compile, DW_UT_type, etc.
D8(address_size);
SectionOffset(abbrev_offset);
if (header_type == dwarf2reader::DW_UT_type) {
uint64 dummy_type_signature = 0xdeadbeef;
uint64 dummy_type_offset = 0x2b;
D64(dummy_type_signature);
if (format_size_ == 4)
D32(dummy_type_offset);
else
D64(dummy_type_offset);
}
}
return *this;
}