llvm-project/lldb/unittests/Utility
Pavel Labath 2f93fd1f50 Represent invalid UUIDs as UUIDs with length zero
Summary:
During the previous attempt to generalize the UUID class, it was
suggested that we represent invalid UUIDs as length zero (previously, we
used an all-zero UUID for that). This meant that some valid build-ids
could not be represented (it's possible however unlikely that a checksum of
some file would be zero) and complicated adding support for variable
length build-ids (should a 16-byte empty UUID compare equal to a 20-byte
empty UUID?).

This patch resolves these issues by introducing a canonical
representation for an invalid UUID. The slight complication here is that
some clients (MachO) actually use the all-zero notation to mean "no UUID
has been set". To keep this use case working (while making it very
explicit about which construction semantices are wanted), replaced the
UUID constructors and the SetBytes functions with named factory methods.
- "fromData" creates a UUID from the given data, and it treats all bytes
  equally.
- "fromOptionalData" first checks the data contents - if all bytes are
  zero, it treats this as an invalid/empty UUID.

Reviewers: clayborg, sas, lemo, davide, espindola

Subscribers: emaste, lldb-commits, arichardson

Differential Revision: https://reviews.llvm.org/D48479

llvm-svn: 335612
2018-06-26 15:12:20 +00:00
..
Inputs Move StructuredData from Core to Utility 2017-06-27 10:45:31 +00:00
ArchSpecTest.cpp [ArchSpec] Add a unittest to complement the change in r321856. 2018-01-05 18:00:44 +00:00
ArgsTest.cpp Move Args.cpp from Interpreter to Utility 2018-04-17 18:53:35 +00:00
CMakeLists.txt Modernize UUID class 2018-06-21 15:07:43 +00:00
CleanUpTest.cpp [Utility] Simplify and generalize the CleanUp helper, NFC 2018-02-23 22:08:38 +00:00
ConstStringTest.cpp Remove LIBLLDB_LOG_VERBOSE category 2017-02-05 00:44:54 +00:00
EnvironmentTest.cpp Add Utility/Environment class for handling... environments 2018-01-10 11:57:31 +00:00
FileSpecTest.cpp [FileSpec] Delegate common operations to llvm::sys::path 2018-06-13 16:23:21 +00:00
JSONTest.cpp Fixup for r311483: Use correct path to StreamString.h 2017-08-22 19:09:39 +00:00
LogTest.cpp [lit] Fix several tests that fail when using Python 3 or on Windows 2018-05-14 21:04:24 +00:00
NameMatchesTest.cpp Fix a couple of corner cases in NameMatches 2017-02-20 11:35:33 +00:00
StatusTest.cpp Add llvm::Error assignment operator to Status class 2017-06-15 11:23:26 +00:00
StringExtractorTest.cpp unittests: Specify types in a bunch of unittest EXPECT's 2016-10-17 18:22:03 +00:00
StructuredDataTest.cpp cmake + xcode: prevent gtests from using includes from project root 2017-10-03 21:20:18 +00:00
TildeExpressionResolverTest.cpp cmake + xcode: prevent gtests from using includes from project root 2017-10-03 21:20:18 +00:00
TimeoutTest.cpp Add a format_provider for the Timeout class 2017-02-10 11:49:33 +00:00
TimerTest.cpp Move Timer and TraceOptions from Core to Utility 2017-06-29 14:32:17 +00:00
UUIDTest.cpp Represent invalid UUIDs as UUIDs with length zero 2018-06-26 15:12:20 +00:00
UriParserTest.cpp UriParser cleanup 2017-02-10 12:21:22 +00:00
VASprintfTest.cpp Fix VASprintfTest.cpp for Darwin, add checks 2017-08-09 17:27:02 +00:00