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There were a couple of quirks with this parameter:
1. It wasn't being set consistently. E.g., vector types would be of
count `1` but complex types would be `2`. Hence, it wasn't clear what
count was referring to.
2. `count` was not being set if the input type was invalid, possibly
leaving the input reference uninitialized.
3. Only one callsite actually made use of `count`, and that in itself
seems like it could be improved (added a FIXME).
If we ever need a "how many elements does this type represent", we can
implement one with a new `TypeSystem` API that does exactly that.
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Previously, `type lookup` for types in namespaces didn't work with the
native PDB plugin, because `FindTypes` would only look for types whose
base name was equal to their full name. PDB/CodeView does not store the
base names in the TPI stream, but the types have their full name (e.g.
`std::thread` instead of `thread`). So `findRecordsByName` would only
return types in the top level namespace.
This PR changes the lookup to go through all types and check their base
name. As that could be a bit expensive, the names are first cached
(similar to the function lookup in the DIA PDB plugin). Potential types
are checked with `TypeQuery::ContextMatches`.
To be able to handle anonymous namespaces, I changed
`TypeQuery::ContextMatches`. The [`TypeQuery`
constructor](https://github.com/llvm/llvm-project/blob/9ad7edef4276207ca4cefa6b39d11145f4145a72/lldb/source/Symbol/Type.cpp#L76-L79)
inserts all name components as `CompilerContextKind::AnyDeclContext`. To
skip over anonymous namespaces, `ContextMatches` checked if a component
was empty and exactly of kind `Namespace`. For our query, the last check
was always false, so we never skipped anonymous namespaces. DWARF
doesn't have this problem, as it [constructs the context
outside](https://github.com/llvm/llvm-project/blob/abe93d9d7e891a2a6596ddb0c6324280137c89dc/lldb/source/Plugins/SymbolFile/DWARF/DWARFIndex.cpp#L154-L160)
and has proper information about namespaces. I'm not fully sure if my
change is correct and that it doesn't break other users of `TypeQuery`.
This enables `type lookup <type>` to work on types in namespaces.
However, expressions don't work with this yet, because `FindNamespace`
is unimplemented for native PDB.
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This is a continuation of 68fd102, which did the same thing but only for
StopInfo. Using make_shared is both safer and more efficient:
- With make_shared, the object and the control block are allocated
together, which is more efficient.
- With make_shared, the enable_shared_from_this base class is properly
linked to the control block before the constructor finishes, so
shared_from_this() will be safe to use (though still not recommended
during construction).
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This patch pushes the error handling boundary for the GetBitSize()
methods from Runtime into the Type and CompilerType APIs. This makes it
easier to diagnose problems thanks to more meaningful error messages
being available. GetBitSize() is often the first thing LLDB asks about a
type, so this method is particularly important for a better user
experience.
rdar://145667239
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This patch extends TypeQuery matching to support anonymous namespaces. A
new flag is added to control the behavior. In the "strict" mode, the
query must match the type exactly -- all anonymous namespaces included.
The dynamic type resolver in the itanium abi (the motivating use case
for this) uses this flag, as it queries using the name from the
demangles, which includes anonymous namespaces.
This ensures we don't confuse a type with a same-named type in an
anonymous namespace. However, this does *not* ensure we don't confuse
two types in anonymous namespacs (in different CUs). To resolve this, we
would need to use a completely different lookup algorithm, which
probably also requires a DWARF extension.
In the "lax" mode (the default), the anonymous namespaces in the query
are optional, and this allows one search for the type using the usual
language rules (`::A` matches `::(anonymous namespace)::A`).
This patch also changes the type context computation algorithm in
DWARFDIE, so that it includes anonymous namespace information. This
causes a slight change in behavior: the algorithm previously stopped
computing the context after encountering an anonymous namespace, which
caused the outer namespaces to be ignored. This meant that a type like
`NS::(anonymous namespace)::A` would be (incorrectly) recognized as
`::A`). This can cause code depending on the old behavior to misbehave.
The fix is to specify all the enclosing namespaces in the query, or use
a non-exact match.
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This is an alternative, much simpler implementation of #99305. In this
version I replace the AnyModule wildcard match with a special TypeQuery
flag which achieves (mostly) the same thing.
It is a preparatory step for teaching ContextMatches about anonymous
namespaces. It started out as a way to remove the assumption that the
pattern and target contexts must be of the same length -- that's will
not be correct with anonymous namespaces, and probably isn't even
correct right now for AnyModule matches.
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Our dwarf parsing code treats structures and classes as interchangable.
CompilerContextKind is used when looking DIEs for types. This makes sure
we always they're treated the same way.
See also
[#95905#discussion_r1645686628](https://github.com/llvm/llvm-project/pull/95905#discussion_r1645686628).
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After a bug (the bug is that the functions don't handle DW_AT_signature,
aka type units) led me to one of these similar-but-different functions,
I started to realize that most of the differences between these two
functions are actually bugs.
As a first step towards merging them, this patch rewrites both of them
to follow the same pattern, while preserving all of their differences.
The main change is that GetTypeLookupContext now also uses a `seen` list
to avoid reference loops (currently that's not necessary because the
function strictly follows parent links, but that will change with
DW_AT_signatures).
I've also optimized both functions to avoid recursion by starting contruction
with the deepest scope first (and then reversing it).
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Parsing of '::' scopes in TypeQuery was very naive and failed for names
with '::''s in template arguments. Interestingly, one of the functions
it was calling (Type::GetTypeScopeAndBasename) was already doing the
same thing, and getting it (mostly (*)) right. This refactors the
function so that it can return the scope results, fixing the parsing of
names like std::vector<int, std::allocator<int>>::iterator.
Two callers of GetTypeScopeAndBasename are deleted as the functions are
not used (I presume they stopped being used once we started pruning type
search results more eagerly).
(*) This implementation is still not correct when one takes c++
operators into account -- e.g., something like `X<&A::operator<>::T` is
a legitimate type name. We do have an implementation that is able to
handle names like these (CPlusPlusLanguage::MethodName), but using it is
not trivial, because it is hidden in a language plugin and specific to
method name parsing.
---------
Co-authored-by: Michael Buch <michaelbuch12@gmail.com>
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(#84387)
Depends on #84384 and #90329
This adds support for `DW_TAG_LLVM_ptrauth_type` entries corresponding
to explicitly signed types (e.g. free function pointers) in lldb user
expressions. Applies PR https://github.com/apple/llvm-project/pull/8239
from Apple's downstream and also adds tests and related code.
---------
Co-authored-by: Jonas Devlieghere <jonas@devlieghere.com>
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The types we get out of expressions will not have an associated symbol
file, so the current method of looking up the type will fail. Instead, I
plumb the query through the TypeSystem class. This correctly finds the
type in both cases (importing it into the expression AST if needed). I
haven't measured, but it should also be more efficient than doing a type
lookup (at least, after the type has already been found once).
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(#84219)
Change GetNumChildren()/CalculateNumChildren() methods return
llvm::Expected
This is an NFC change that does not yet add any error handling or change
any code to return any errors.
This is the second big change in the patch series started with
https://github.com/llvm/llvm-project/pull/83501
A follow-up PR will wire up error handling.
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llvm::Expected (#84219)"
This reverts commit 99118c809367d518ffe4de60c16da953744b68b9.
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(#84219)
Change GetNumChildren()/CalculateNumChildren() methods return
llvm::Expected
This is an NFC change that does not yet add any error handling or change
any code to return any errors.
This is the second big change in the patch series started with
https://github.com/llvm/llvm-project/pull/83501
A follow-up PR will wire up error handling.
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This is required for users of `TypeQuery` that limit the set of
languages of the query using APIs such as
`GetSupportedLanguagesForTypes` or
`GetSupportedLanguagesForExpressions`.
Example usage: https://github.com/apple/llvm-project/pull/7885
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for types (#74786)
This patch revives the effort to get this Phabricator patch into
upstream:
https://reviews.llvm.org/D137900
This patch was accepted before in Phabricator but I found some
-gsimple-template-names issues that are fixed in this patch.
A fixed up version of the description from the original patch starts
now.
This patch started off trying to fix Module::FindFirstType() as it
sometimes didn't work. The issue was the SymbolFile plug-ins didn't do
any filtering of the matching types they produced, and they only looked
up types using the type basename. This means if you have two types with
the same basename, your type lookup can fail when only looking up a
single type. We would ask the Module::FindFirstType to lookup "Foo::Bar"
and it would ask the symbol file to find only 1 type matching the
basename "Bar", and then we would filter out any matches that didn't
match "Foo::Bar". So if the SymbolFile found "Foo::Bar" first, then it
would work, but if it found "Baz::Bar" first, it would return only that
type and it would be filtered out.
Discovering this issue lead me to think of the patch Alex Langford did a
few months ago that was done for finding functions, where he allowed
SymbolFile objects to make sure something fully matched before parsing
the debug information into an AST type and other LLDB types. So this
patch aimed to allow type lookups to also be much more efficient.
As LLDB has been developed over the years, we added more ways to to type
lookups. These functions have lots of arguments. This patch aims to make
one API that needs to be implemented that serves all previous lookups:
- Find a single type
- Find all types
- Find types in a namespace
This patch introduces a `TypeQuery` class that contains all of the state
needed to perform the lookup which is powerful enough to perform all of
the type searches that used to be in our API. It contain a vector of
CompilerContext objects that can fully or partially specify the lookup
that needs to take place.
If you just want to lookup all types with a matching basename,
regardless of the containing context, you can specify just a single
CompilerContext entry that has a name and a CompilerContextKind mask of
CompilerContextKind::AnyType.
Or you can fully specify the exact context to use when doing lookups
like: CompilerContextKind::Namespace "std"
CompilerContextKind::Class "foo"
CompilerContextKind::Typedef "size_type"
This change expands on the clang modules code that already used a
vector<CompilerContext> items, but it modifies it to work with
expression type lookups which have contexts, or user lookups where users
query for types. The clang modules type lookup is still an option that
can be enabled on the `TypeQuery` objects.
This mirrors the most recent addition of type lookups that took a
vector<CompilerContext> that allowed lookups to happen for the
expression parser in certain places.
Prior to this we had the following APIs in Module:
```
void
Module::FindTypes(ConstString type_name, bool exact_match, size_t max_matches,
llvm::DenseSet<lldb_private::SymbolFile *> &searched_symbol_files,
TypeList &types);
void
Module::FindTypes(llvm::ArrayRef<CompilerContext> pattern, LanguageSet languages,
llvm::DenseSet<lldb_private::SymbolFile *> &searched_symbol_files,
TypeMap &types);
void Module::FindTypesInNamespace(ConstString type_name,
const CompilerDeclContext &parent_decl_ctx,
size_t max_matches, TypeList &type_list);
```
The new Module API is much simpler. It gets rid of all three above
functions and replaces them with:
```
void FindTypes(const TypeQuery &query, TypeResults &results);
```
The `TypeQuery` class contains all of the needed settings:
- The vector<CompilerContext> that allow efficient lookups in the symbol
file classes since they can look at basename matches only realize fully
matching types. Before this any basename that matched was fully realized
only to be removed later by code outside of the SymbolFile layer which
could cause many types to be realized when they didn't need to.
- If the lookup is exact or not. If not exact, then the compiler context
must match the bottom most items that match the compiler context,
otherwise it must match exactly
- If the compiler context match is for clang modules or not. Clang
modules matches include a Module compiler context kind that allows types
to be matched only from certain modules and these matches are not needed
when d oing user type lookups.
- An optional list of languages to use to limit the search to only
certain languages
The `TypeResults` object contains all state required to do the lookup
and store the results:
- The max number of matches
- The set of SymbolFile objects that have already been searched
- The matching type list for any matches that are found
The benefits of this approach are:
- Simpler API, and only one API to implement in SymbolFile classes
- Replaces the FindTypesInNamespace that used a CompilerDeclContext as a
way to limit the search, but this only worked if the TypeSystem matched
the current symbol file's type system, so you couldn't use it to lookup
a type in another module
- Fixes a serious bug in our FindFirstType functions where if we were
searching for "foo::bar", and we found a "baz::bar" first, the basename
would match and we would only fetch 1 type using the basename, only to
drop it from the matching list and returning no results
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(#67599)
Add the ability to get a C++ vtable ValueObject from another
ValueObject.
This patch adds the ability to ask a ValueObject for a ValueObject that
represents the virtual function table for a C++ class. If the
ValueObject is not a C++ class with a vtable, a valid ValueObject value
will be returned that contains an appropriate error. If it is successful
a valid ValueObject that represents vtable will be returned. The
ValueObject that is returned will have a name that matches the demangled
value for a C++ vtable mangled name like "vtable for <class-name>". It
will have N children, one for each virtual function pointer. Each
child's value is the function pointer itself, the summary is the
symbolication of this function pointer, and the type will be a valid
function pointer from the debug info if there is debug information
corresponding to the virtual function pointer.
The vtable SBValue will have the following:
- SBValue::GetName() returns "vtable for <class>"
- SBValue::GetValue() returns a string representation of the vtable
address
- SBValue::GetSummary() returns NULL
- SBValue::GetType() returns a type appropriate for a uintptr_t type for
the current process
- SBValue::GetLoadAddress() returns the address of the vtable adderess
- SBValue::GetValueAsUnsigned(...) returns the vtable address
- SBValue::GetNumChildren() returns the number of virtual function
pointers in the vtable
- SBValue::GetChildAtIndex(...) returns a SBValue that represents a
virtual function pointer
The child SBValue objects that represent a virtual function pointer has
the following values:
- SBValue::GetName() returns "[%u]" where %u is the vtable function
pointer index
- SBValue::GetValue() returns a string representation of the virtual
function pointer
- SBValue::GetSummary() returns a symbolicated respresentation of the
virtual function pointer
- SBValue::GetType() returns the function prototype type if there is
debug info, or a generic funtion prototype if there is no debug info
- SBValue::GetLoadAddress() returns the address of the virtual function
pointer
- SBValue::GetValueAsUnsigned(...) returns the virtual function pointer
- SBValue::GetNumChildren() returns 0
- SBValue::GetChildAtIndex(...) returns invalid SBValue for any index
Examples of using this API via python:
```
(lldb) script vtable = lldb.frame.FindVariable("shape_ptr").GetVTable()
(lldb) script vtable
vtable for Shape = 0x0000000100004088 {
[0] = 0x0000000100003d20 a.out`Shape::~Shape() at main.cpp:3
[1] = 0x0000000100003e4c a.out`Shape::~Shape() at main.cpp:3
[2] = 0x0000000100003e7c a.out`Shape::area() at main.cpp:4
[3] = 0x0000000100003e3c a.out`Shape::optional() at main.cpp:7
}
(lldb) script c = vtable.GetChildAtIndex(0)
(lldb) script c
(void ()) [0] = 0x0000000100003d20 a.out`Shape::~Shape() at main.cpp:3
```
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I need this API in the Swift plugin, but it seems generally useful
enough to expose it in the main branch.
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This patch adds a `SBType::FindDirectNestedType(name)` function which performs a non-recursive search in given class for a type with specified name. The intent is to perform a fast search in debug info, so that it can be used in formatters, and let them remain responsive.
This is driven by my work on formatters for Clang and LLVM types. In particular, by [`PointerIntPairInfo::MaskAndShiftConstants`](https://github.com/llvm/llvm-project/blob/cde9f9df79805a0850310870d6dcc64004292727/llvm/include/llvm/ADT/PointerIntPair.h#L174C16-L174C16), which is required to extract pointer and integer from `PointerIntPair`.
Related Discourse thread: https://discourse.llvm.org/t/traversing-member-types-of-a-type/72452
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I found some type/typesystem code that is dead and some of it seems to
have been replaced by the ValueObjectPrinter.
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Fix incorrect uses of LLDB_LOG_ERROR. The macro doesn't automatically
inject the error in the log message: it merely passes the error as the
first argument to formatv and therefore must be referenced with {0}.
Thanks to Nicholas Allegra for collecting a list of places where the
macro was misused.
rdar://111581655
Differential revision: https://reviews.llvm.org/D154530
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This patch replaces (llvm::|)Optional< with std::optional<. I'll post
a separate patch to clean up the "using" declarations, #include
"llvm/ADT/Optional.h", etc.
This is part of an effort to migrate from llvm::Optional to
std::optional:
https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716
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This patch adds #include <optional> to those files containing
llvm::Optional<...> or Optional<...>.
I'll post a separate patch to actually replace llvm::Optional with
std::optional.
This is part of an effort to migrate from llvm::Optional to
std::optional:
https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716
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SymbolFileDWARF::FindTypes
The provided test case was crashing because of confusion attempting to find types for `ns::Foo` under -gsimple-template-names. (This looks broken normally because it's attempting to find `ns::Foo` rather than `ns::Foo<T>`)
Looking up types can't give false positives, as opposed to looking up functions as mentioned in https://reviews.llvm.org/D137098.
Reviewed By: Michael137
Differential Revision: https://reviews.llvm.org/D140240
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This avoids the continuous API churn when upgrading things to use
std::optional and makes trivial string replace upgrades possible.
I tested this with GCC 7.5, the oldest supported GCC I had around.
Differential Revision: https://reviews.llvm.org/D140332
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When a process gets restarted TypeSystem objects associated with it
may get deleted, and any CompilerType objects holding on to a
reference to that type system are a use-after-free in waiting. Because
of the SBAPI, we don't have tight control over where CompilerTypes go
and when they are used. This is particularly a problem in the Swift
plugin, where the scratch TypeSystem can be restarted while the
process is still running. The Swift plugin has a lock to prevent
abuse, but where there's a lock there can be bugs.
This patch changes CompilerType to store a std::weak_ptr<TypeSystem>.
Most of the std::weak_ptr<TypeSystem>* uglyness is hidden by
introducing a wrapper class CompilerType::WrappedTypeSystem that has a
dyn_cast_or_null() method. The only sites that need to know about the
weak pointer implementation detail are the ones that deal with
creating TypeSystems.
rdar://101505232
Differential Revision: https://reviews.llvm.org/D136650
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See https://discourse.llvm.org/t/dwarf-using-simplified-template-names/58417 for background on simplified template names.
lldb doesn't work with simplified template names because it uses DW_AT_name which doesn't contain template parameters under simplified template names.
Two major changes are required to make lldb work with simplified template names.
1) When building clang ASTs for struct-like dies, we use the name as a cache key. To distinguish between different instantiations of a template class, we need to add in the template parameters.
2) When looking up types, if the requested type name contains '<' and we didn't initially find any types from the index searching the name, strip the template parameters and search the index, then filter out results with non-matching template parameters. This takes advantage of the clang AST's ability to print full names rather than doing it by ourself.
An alternative is to fix up the names in the index to contain the fully qualified name, but that doesn't respect .debug_names.
Reviewed By: labath
Differential Revision: https://reviews.llvm.org/D134378
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I went over the output of the following mess of a command:
(ulimit -m 2000000; ulimit -v 2000000; git ls-files -z | parallel
--xargs -0 cat | aspell list --mode=none --ignore-case | grep -E
'^[A-Za-z][a-z]*$' | sort | uniq -c | sort -n | grep -vE '.{25}' |
aspell pipe -W3 | grep : | cut -d' ' -f2 | less)
and proceeded to spend a few days looking at it to find probable typos
and fixed a few hundred of them in all of the llvm project (note, the
ones I found are not anywhere near all of them, but it seems like a
good start).
Differential revision: https://reviews.llvm.org/D131122
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Improve LLDB reliability by fixing the following "uninitialized variables" static code inspection warnings from
scan.coverity.com:
1476275, 1274012, 1455035, 1364789, 1454282
1467483, 1406152, 1406255, 1454837, 1454416
1467446, 1462022, 1461909, 1420566, 1327228
1367767, 1431254, 1467299, 1312678, 1431780
1454731, 1490403
Differential Revision: https://reviews.llvm.org/D130528
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scan. Part 2"
This reverts commit b9aedd94e6796e4b4866ab4c091b736b3db58cb7.
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Improve LLDB reliability by fixing the following "uninitialized variables" static code inspection warnings from
scan.coverity.com:
1476275, 1274012, 1455035, 1364789, 1454282
1467483, 1406152, 1406255, 1454837, 1454416
1467446, 1462022, 1461909, 1420566, 1327228
1367767, 1431254, 1467299, 1312678, 1431780
1454731, 1490403
Differential Revision: https://reviews.llvm.org/D130528
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Applied modernize-use-default-member-init clang-tidy check over LLDB.
It appears in many files we had already switched to in class member init but
never updated the constructors to reflect that. This check is already present in
the lldb/.clang-tidy config.
Differential Revision: https://reviews.llvm.org/D121481
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Most of our code was including Log.h even though that is not where the
"lldb" log channel is defined (Log.h defines the generic logging
infrastructure). This worked because Log.h included Logging.h, even
though it should.
After the recent refactor, it became impossible the two files include
each other in this direction (the opposite inclusion is needed), so this
patch removes the workaround that was put in place and cleans up all
files to include the right thing. It also renames the file to LLDBLog to
better reflect its purpose.
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Reviewed By: teemperor, JDevlieghere, dblaikie
Differential Revision: https://reviews.llvm.org/D113604
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This reverts commit 6f99e1aa58e3566fcce689bc986b7676e818c038.
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Reviewed By: teemperor, JDevlieghere
Differential Revision: https://reviews.llvm.org/D113604
Signed-off-by: Luís Ferreira <contact@lsferreira.net>
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This converts a default constructor's member initializers into C++11
default member initializers. This patch was automatically generated with
clang-tidy and the modernize-use-default-member-init check.
$ run-clang-tidy.py -header-filter='lldb' -checks='-*,modernize-use-default-member-init' -fix
This is a mass-refactoring patch and this commit will be added to
.git-blame-ignore-revs.
Differential revision: https://reviews.llvm.org/D103483
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The C headers are deprecated so as requested in D102845, this is replacing them
all with their (not deprecated) C++ equivalent.
Reviewed By: shafik
Differential Revision: https://reviews.llvm.org/D103084
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A type system is not guaranteed to have a symbol file. This patch adds null-pointer checks so we don't crash when trying to access a type system's symbol file.
Reviewed By: aprantl, teemperor
Differential Revision: https://reviews.llvm.org/D101539
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The function was returning an incorrect (empty) value on the first
invocation. Given that this only affected the first invocation, this
bug/typo went mostly unaffected. DW_AT_const_value were particularly
badly affected by this as the GetByteSize call is
SymbolFileDWARF::ParseVariableDIE is likely to be the first call of this
function, and its effects cannot be undone by retrying.
Depends on D86348.
Differential Revision: https://reviews.llvm.org/D86436
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This patch has no effect for C and C++. In more dynamic languages,
such as Objective-C and Swift GetByteSize() needs to call into the
language runtime, so it's important to pass one in where possible. My
primary motivation for this is some work I'm doing on the Swift
branch, however, it looks like we are also seeing warnings in
Objective-C that this may resolve. Everything in the SymbolFile
hierarchy still passes in nullptrs, because we don't have an execution
context in SymbolFile, since SymbolFile transcends processes.
Differential Revision: https://reviews.llvm.org/D84267
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This patch threads an lldb::DescriptionLevel through the typesystem to
allow dumping the full Clang AST (level=verbose) of any lldb::Type in
addition to the human-readable source description (default
level=full). This type dumping interface is currently not exposed
through the SBAPI.
The application is to let lldb-test dump the clang AST of search
results. I need this to test lazy type completion of clang types in
subsequent patches.
Differential Revision: https://reviews.llvm.org/D78329
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Types that came from a Clang module are nested in DW_TAG_module tags
in DWARF. This patch recreates the Clang module hierarchy in LLDB and
1;95;0csets the owning module information accordingly. My primary motivation
is to facilitate looking up per-module APINotes for individual
declarations, but this likely also has other applications.
This reapplies the previously reverted commit, but without support for
ClassTemplateSpecializations, which I'm going to look into separately.
rdar://problem/59634380
Differential Revision: https://reviews.llvm.org/D75488
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AST"
This reverts commit 4354dfbdf5c8510a7ddff10ae67a28e16cf7cc79 while investigating bot fallout.
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Types that came from a Clang module are nested in DW_TAG_module tags
in DWARF. This patch recreates the Clang module hierarchy in LLDB and
sets the owning module information accordingly. My primary motivation
is to facilitate looking up per-module APINotes for individual
declarations, but this likely also has other applications.
rdar://problem/59634380
Differential Revision: https://reviews.llvm.org/D75488
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Differential Revision: https://reviews.llvm.org/D75562
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CompilerType
Beside these two functions just being wrappers around GetTypeName they are also
just a leftover from migrating the CompilerType interface to ConstString.
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