Commit Graph

64 Commits

Author SHA1 Message Date
Jonas Devlieghere 9d5e95d094 Re-land "[lldb] Upstream support for Foundation constant classes"
Upstream support for NSConstantArray, NSConstantIntegerNumber,
NSConstant{Float,Double}Number and NSConstantDictionary.

We would've upstreamed this earlier but testing it requires
-fno-constant-nsnumber-literals, -fno-constant-nsarray-literals and
-fno-constant-nsdictionary-literals which haven't been upstreamed yet.
As a temporary workaround use the system compiler (xcrun clang) for the
constant variant of the tests.

I'm just upstreaming this. The patch and the tests were all authored by
Fred Riss.

Differential revision: https://reviews.llvm.org/D107660
2021-08-06 17:24:47 -07:00
Sterling Augustine 4e5af6ef48 Revert "[lldb] Upstream support for Foundation constant classes"
This reverts commit 34d78b6a67.

This breaks build bots witha  missing file:
/home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/source/Plugins/Language/ObjC/Cocoa.cpp:10:10: fatal error: 'objc/runtime.h' file not found
2021-08-06 16:56:59 -07:00
Jonas Devlieghere 34d78b6a67 [lldb] Upstream support for Foundation constant classes
Upstream support for NSConstantArray, NSConstantIntegerNumber,
NSConstant{Float,Double}Number and NSConstantDictionary.

We would've upstreamed this earlier but testing it requires
-fno-constant-nsnumber-literals, -fno-constant-nsarray-literals and
-fno-constant-nsdictionary-literals which haven't been upstreamed yet.
As a temporary workaround use the system compiler (xcrun clang) for the
constant variant of the tests.

I'm just upstreaming this. The patch and the tests were all authored by
Fred Riss.

Differential revision: https://reviews.llvm.org/D107660
2021-08-06 16:08:48 -07:00
Martin Storsjö e50f9c419a [lldb] Rename StringRef _lower() method calls to _insensitive() 2021-06-25 00:22:01 +03:00
Alex Langford 5bebc0b177 [lldb] Decouple ObjCLanguage from Symtab
We can extend/modify `GetMethodNameVariants` to suit our purposes here.
What symtab is looking for is alternate names we may want to use to
search for a specific symbol, and asking for variants of a name makes
the most sense here.

Differential Revision: https://reviews.llvm.org/D104067
2021-06-23 13:49:46 -07:00
Raphael Isemann ecfca427f9 [lldb][NFC] Use Language plugins in Mangled::GuessLanguage
This removes the direct dependency to the ObjC and C++ plugins.

Reviewed By: bulbazord

Differential Revision: https://reviews.llvm.org/D103158
2021-06-01 18:02:07 +02:00
Alex Langford 4c0b0de904 [lldb] Move ClangModulesDeclVendor ownership to ClangPersistentVariables from Target
More decoupling of plugins and non-plugins. Target doesn't need to
manage ClangModulesDeclVendor and ClangPersistentVariables is always available
in situations where you need ClangModulesDeclVendor.

Differential Revision: https://reviews.llvm.org/D102811
2021-05-24 13:13:12 -07:00
Med Ismail Bennani 0eba9de71e [lldb/Dataformatter] Add support to CF{Dictionary,Set}Ref types
This patch improves data formatting for CFDictionaryRef and CFSetRef.
It uses the same data-formatter as NSCFDictionaries and NSCFSets introduced
previously but did require some adjustments in Core::ValueObject.

Since the "Ref" types are opaque pointers to the actual CF containers, if the
value object has a synthetic value, lldb will use the opaque pointer's pointee
type to create the new ValueObjectChild needed to dereference the ValueObject.
This allows the "Ref" types to behaves the same as CF containers when used with
the `frame variable` command, the SBAPI or in Xcode's variable inspector.

This patch also adds support for incomplete types in ValueObject.

rdar://53104287

Differential Revision: https://reviews.llvm.org/D79554

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>
2020-05-15 22:14:39 +02:00
Med Ismail Bennani 8f5beb4c4b
[lldb/Dataformatter] Add support for CoreFoundation Dictionaries and Sets.
This patch improves data formatting for CoreFoundation containers:
CFDictionary and CFSet.

These data formatters make the containers and their children appear in Xcode's
variables view (and on the command line) without having to expand the
data structure.

Previous implementation only supported showing the container's element count.

```
(lldb) frame var dict
(__NSCFDictionary *) dict = 0x00000001004062b0 2 key/value pairs

(lldb) frame var set
(__NSCFSet *) set = 0x0000000100406330 2 elements
```
Now the variable can be dereferenced to dispaly the container's children:

```
(lldb) frame var *dict
(__NSCFDictionary) *dict = {
  [0] = {
    key = 0x0000000100004050 @"123"
    value = 0x0000000100004090 @"456"
  }
  [1] = {
    key = 0x0000000100004030 @"abc"
    value = 0x0000000100004070 @"def"
  }
}

(lldb) frame var *set
(__NSCFSet) *set = {
  [0] = 0x0000000100004050 @"123"
  [1] = 0x0000000100004030 @"abc"
}
```

rdar://39882287

Differential Revision: https://reviews.llvm.org/D78396

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>
2020-04-27 22:10:11 +02:00
Jonas Devlieghere bba9ba8d95 [lldb/Plugin] s/LLDB_PLUGIN/LLDB_PLUGIN_DEFINE/ (NFC)
Rename LLDB_PLUGIN to LLDB_PLUGIN_DEFINE as Pavel suggested in D73067 to
avoid name conflict.
2020-02-14 09:58:24 -08:00
Martin Storsjö 6115bd9ba2 [LLDB] Fix GCC warnings about extra semicolons. NFC. 2020-02-10 11:20:44 +02:00
Jonas Devlieghere fbb4d1e43d [lldb/Plugins] Use external functions to (de)initialize plugins
This is a step towards making the initialize and terminate calls be
generated by CMake, which in turn is towards making it possible to
disable plugins at configuration time.

Differential revision: https://reviews.llvm.org/D74245
2020-02-07 15:28:27 -08:00
Alex Langford 8be30215fe [lldb] Move clang-based files out of Symbol
Summary:
This change represents the move of ClangASTImporter, ClangASTMetadata,
ClangExternalASTSourceCallbacks, ClangUtil, CxxModuleHandler, and
TypeSystemClang from lldbSource to lldbPluginExpressionParserClang.h

This explicitly removes knowledge of clang internals from lldbSymbol,
moving towards a more generic core implementation of lldb.

Reviewers: JDevlieghere, davide, aprantl, teemperor, clayborg, labath, jingham, shafik

Subscribers: emaste, mgorny, arphaman, jfb, usaxena95, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D73661
2020-01-31 12:20:10 -08:00
Raphael Isemann 808142876c [lldb][NFC] Fix all formatting errors in .cpp file headers
Summary:
A *.cpp file header in LLDB (and in LLDB) should like this:
```
//===-- TestUtilities.cpp -------------------------------------------------===//
```
However in LLDB most of our source files have arbitrary changes to this format and
these changes are spreading through LLDB as folks usually just use the existing
source files as templates for their new files (most notably the unnecessary
editor language indicator `-*- C++ -*-` is spreading and in every review
someone is pointing out that this is wrong, resulting in people pointing out that this
is done in the same way in other files).

This patch removes most of these inconsistencies including the editor language indicators,
all the different missing/additional '-' characters, files that center the file name, missing
trailing `===//` (mostly caused by clang-format breaking the line).

Reviewers: aprantl, espindola, jfb, shafik, JDevlieghere

Reviewed By: JDevlieghere

Subscribers: dexonsmith, wuzish, emaste, sdardis, nemanjai, kbarton, MaskRay, atanasyan, arphaman, jfb, abidh, jsji, JDevlieghere, usaxena95, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D73258
2020-01-24 08:52:55 +01:00
Raphael Isemann 6e3b0cc2fb [lldb][NFC] Rename ClangASTContext to TypeSystemClang
Summary:
This commit renames ClangASTContext to TypeSystemClang to better reflect what this class is actually supposed to do
(implement the TypeSystem interface for Clang). It also gets rid of the very confusing situation that we have both a
`clang::ASTContext` and a `ClangASTContext` in clang (which sometimes causes Clang people to think I'm fiddling
with Clang's ASTContext when I'm actually just doing LLDB work).

I also have plans to potentially have multiple clang::ASTContext instances associated with one ClangASTContext so
the ASTContext naming will then become even more confusing to people.

Reviewers: #lldb, aprantl, shafik, clayborg, labath, JDevlieghere, davide, espindola, jdoerfert, xiaobai

Reviewed By: clayborg, labath, xiaobai

Subscribers: wuzish, emaste, nemanjai, mgorny, kbarton, MaskRay, arphaman, jfb, usaxena95, jingham, xiaobai, abidh, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D72684
2020-01-23 10:09:14 +01:00
Raphael Isemann 874b6495b5 [lldb] Add missing include to ObjCLanguage.cpp to fix build 2019-11-12 10:21:49 +01:00
Raphael Isemann bd7d9a85b8 [lldb] Check if we actually have a Clang type in ObjCLanguage::GetPossibleFormattersMatches
We call IsPossibleDynamicType but we also need to check if this is a Clang type,
otherwise other languages with dynamic types (like Swift) might end up being interpreted
as potential Obj-C dynamic types.
2019-11-12 09:59:04 +01:00
Alex Langford 9e86561878 [Symbol] Give ClangASTContext a PersistentExpressionState instead of a ClangPersistentVariables
ClangASTContext doesn't use m_persistent_variables in a way specific to
ClangPersistentVariables. Therefore, it should hold a unique pointer to
PersistentExpressionState instead of a ClangPersistentVariablesUP.
This also prevents you from pulling in a plugin header when including
ClangASTContext.h

Doing this exposed an implicit dependency in ObjCLanguage that was
corrected by including ClangModulesDeclVendor.h

llvm-svn: 371470
2019-09-09 23:11:43 +00:00
Alex Langford b5701710a4 [LanguageRuntime] Move ObjCLanguageRuntime into a plugin
Summary:
Following up to my CPPLanguageRuntime change, I'm moving
ObjCLanguageRuntime into a plugin as well.

Reviewers: JDevlieghere, compnerd, jingham, clayborg

Subscribers: mgorny, arphaman, lldb-commits

Differential Revision: https://reviews.llvm.org/D64763

llvm-svn: 366148
2019-07-15 22:56:12 +00:00
Alex Langford 8055cbc449 [Symbol] Add DeclVendor::FindTypes
Summary:
Following up on the plan I outlined in D63622, we can remove the
dependence on clang in all the places where we only want to find the
types from the DeclVendor. This means that currently DeclVendor depends
on clang, but centralizing the dependency makes it easier to refactor
cleanly.

Differential Revision: https://reviews.llvm.org/D63853

llvm-svn: 364962
2019-07-02 19:53:07 +00:00
Alex Langford e823bbe8d1 [Target] Remove Process::GetObjCLanguageRuntime
Summary:
In an effort to make Process more language agnostic, I removed
GetCPPLanguageRuntime from Process. I'm following up now with an equivalent
change for ObjC.

Differential Revision: https://reviews.llvm.org/D63052

llvm-svn: 362981
2019-06-10 20:53:23 +00:00
Alex Langford 58a638b79f [Breakpoint] Make breakpoint language agnostic
Summary:
Breakpoint shouldn't need to depend on any specific details from a
programming language. Currently the only language-specific detail it takes
advantage of are the different qualified names an objective-c method name might
have when adding a name lookup. This is reasonably generalizable.

The current method name I introduced is "GetVariantMethodNames", which I'm not
particularly tied to. If you have a better suggestion, please do let me know.

Reviewers: JDevlieghere, jingham, clayborg

Subscribers: mgorny, lldb-commits

Differential Revision: https://reviews.llvm.org/D61746

llvm-svn: 360509
2019-05-11 03:32:25 +00:00
Raphael Isemann 1756630dfa C.128 override, virtual keyword handling
Summary:
According to [C128] "Virtual functions should specify exactly one
of `virtual`, `override`, or `final`", I've added override where a
virtual function is overriden but the explicit `override` keyword
was missing. Whenever both `virtual` and `override` were specified,
I removed `virtual`. As C.128 puts it:

> [...] writing more than one of these three is both redundant and
> a potential source of errors.

I anticipate a discussion about whether or not to add `override` to
destructors but I went for it because of an example in [ISOCPP1000].
Let me repeat the comment for you here:

Consider this code:

```
    struct Base {
      virtual ~Base(){}
    };

    struct SubClass : Base {
      ~SubClass() {
        std::cout << "It works!\n";
      }
    };

    int main() {
      std::unique_ptr<Base> ptr = std::make_unique<SubClass>();
    }
```

If for some odd reason somebody removes the `virtual` keyword from the
`Base` struct, the code will no longer print `It works!`. So adding
`override` to destructors actively protects us from accidentally
breaking our code at runtime.

[C128]: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c128-virtual-functions-should-specify-exactly-one-of-virtual-override-or-final
[ISOCPP1000]: https://github.com/isocpp/CppCoreGuidelines/issues/1000#issuecomment-476951555

Reviewers: teemperor, JDevlieghere, davide, shafik

Reviewed By: teemperor

Subscribers: kwk, arphaman, kadircet, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D61440

llvm-svn: 359868
2019-05-03 10:03:28 +00:00
Jonas Devlieghere 8b3af63b89 [NFC] Remove ASCII lines from comments
A lot of comments in LLDB are surrounded by an ASCII line to delimit the
begging and end of the comment.

Its use is not really consistent across the code base, sometimes the
lines are longer, sometimes they are shorter and sometimes they are
omitted. Furthermore, it looks kind of weird with the 80 column limit,
where the comment actually extends past the line, but not by much.
Furthermore, when /// is used for Doxygen comments, it looks
particularly odd. And when // is used, it incorrectly gives the
impression that it's actually a Doxygen comment.

I assume these lines were added to improve distinguishing between
comments and code. However, given that todays editors and IDEs do a
great job at highlighting comments, I think it's worth to drop this for
the sake of consistency. The alternative is fixing all the
inconsistencies, which would create a lot more churn.

Differential revision: https://reviews.llvm.org/D60508

llvm-svn: 358135
2019-04-10 20:48:55 +00:00
Davide Italiano 3772796aaa [ObjCLanguage] Remove LLDB_DISABLE_PYTHON markers from the formatters.
llvm-svn: 356210
2019-03-14 22:12:59 +00:00
Adrian Prantl 0e4c482124 Pass ConstString by value (NFC)
My apologies for the large patch. With the exception of ConstString.h
itself it was entirely produced by sed.

ConstString has exactly one const char * data member, so passing a
ConstString by reference is not any more efficient than copying it by
value. In both cases a single pointer is passed. But passing it by
value makes it harder to accidentally return the address of a local
object.

(This fixes rdar://problem/48640859 for the Apple folks)

Differential Revision: https://reviews.llvm.org/D59030

llvm-svn: 355553
2019-03-06 21:22:25 +00:00
Chandler Carruth 2946cd7010 Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00
Kuba Mracek 377912845e [lldb] Add synthetic frontend for _NSCallStackArray
An Obj-C array type _NSCallStackArray is used in NSException backtraces. This patch adds a synthetic frontend for _NSCallStackArray, which now correctly returns frame PCs.

Differential Revision: https://reviews.llvm.org/D44081

llvm-svn: 346708
2018-11-12 21:26:03 +00:00
Jonas Devlieghere ceff6644bb Remove header grouping comments.
This patch removes the comments grouping header includes. They were
added after running IWYU over the LLDB codebase. However they add little
value, are often outdates and burdensome to maintain.

llvm-svn: 346626
2018-11-11 23:17:06 +00:00
Raphael Isemann 566afa0ab2 [LLDB] Added syntax highlighting support
Summary:
This patch adds syntax highlighting support to LLDB. When enabled (and lldb is allowed
to use colors), printed source code is annotated with the ANSI color escape sequences.

So far we have only one highlighter which is based on Clang and is responsible for all
languages that are supported by Clang. It essentially just runs the raw lexer over the input
and then surrounds the specific tokens with the configured escape sequences.

Reviewers: zturner, davide

Reviewed By: davide

Subscribers: labath, teemperor, llvm-commits, mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D49334

llvm-svn: 338662
2018-08-02 00:30:15 +00:00
Jonas Devlieghere 20b051ba41 [ObjC] Add dataformatter for NSDecimalNumber
This patch adds a data formatter for NSDecimalNumber. The latter is a
Foundation object used for representing and performing arithmetic on
base-10 numbers that bridges to Decimal.

Differential revision: https://reviews.llvm.org/D48114

llvm-svn: 334638
2018-06-13 18:47:04 +00:00
Adrian Prantl 4e8be2c98e Fix/unify the spelling of Objective-C.
llvm-svn: 334614
2018-06-13 16:21:24 +00:00
Adrian Prantl 05097246f3 Reflow paragraphs in comments.
This is intended as a clean up after the big clang-format commit
(r280751), which unfortunately resulted in many of the comment
paragraphs in LLDB being very hard to read.

FYI, the script I used was:

import textwrap
import commands
import os
import sys
import re
tmp = "%s.tmp"%sys.argv[1]
out = open(tmp, "w+")
with open(sys.argv[1], "r") as f:
  header = ""
  text = ""
  comment = re.compile(r'^( *//) ([^ ].*)$')
  special = re.compile(r'^((([A-Z]+[: ])|([0-9]+ )).*)|(.*;)$')
  for line in f:
      match = comment.match(line)
      if match and not special.match(match.group(2)):
          # skip intentionally short comments.
          if not text and len(match.group(2)) < 40:
              out.write(line)
              continue

          if text:
              text += " " + match.group(2)
          else:
              header = match.group(1)
              text = match.group(2)

          continue

      if text:
          filled = textwrap.wrap(text, width=(78-len(header)),
                                 break_long_words=False)
          for l in filled:
              out.write(header+" "+l+'\n')
              text = ""

      out.write(line)

os.rename(tmp, sys.argv[1])

Differential Revision: https://reviews.llvm.org/D46144

llvm-svn: 331197
2018-04-30 16:49:04 +00:00
Sean Callanan 18b5d9268c Updated NSNumber formatter for new internal representation.
<rdar://problem/32780109>

llvm-svn: 305727
2017-06-19 18:32:22 +00:00
Stephane Sezer ca5e153fb1 Avoid invalid string access in ObjCLanguage::MethodName::SetName
Summary:
Don't access `name[1]  if the string is only of length 1.  Avoids a
crash/assertion failure when parsing the string `-`.

Test Plan:
Debug a swift binary, set a breakpoint, watch lldb not crash

Original change by Paul Menage <menage@fb.com>

Reviewers: lldb-commits, clayborg

Differential Revision: https://reviews.llvm.org/D33853

llvm-svn: 304725
2017-06-05 17:44:04 +00:00
Kamil Rytarowski c5f28e2a05 Switch std::call_once to llvm::call_once
Summary:
The std::call_once implementation in libstdc++ has problems on few systems: NetBSD, OpenBSD and Linux PPC. LLVM ships with a homegrown implementation llvm::call_once to help on these platforms.

This change is required in the NetBSD LLDB port. std::call_once with libstdc++ results with crashing the debugger.

Sponsored by <The NetBSD Foundation>

Reviewers: labath, joerg, emaste, mehdi_amini, clayborg

Reviewed By: labath, clayborg

Subscribers: #lldb

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D29288

llvm-svn: 294202
2017-02-06 17:55:02 +00:00
Zachary Turner bf9a77305f Move classes from Core -> Utility.
This moves the following classes from Core -> Utility.

ConstString
Error
RegularExpression
Stream
StreamString

The goal here is to get lldbUtility into a state where it has
no dependendencies except on itself and LLVM, so it can be the
starting point at which to start untangling LLDB's dependencies.
These are all low level and very widely used classes, and
previously lldbUtility had dependencies up to lldbCore in order
to use these classes.  So moving then down to lldbUtility makes
sense from both the short term and long term perspective in
solving this problem.

Differential Revision: https://reviews.llvm.org/D29427

llvm-svn: 293941
2017-02-02 21:39:50 +00:00
Zachary Turner c156427ded Don't allow direct access to StreamString's internal buffer.
This is a large API change that removes the two functions from
StreamString that return a std::string& and a const std::string&,
and instead provide one function which returns a StringRef.

Direct access to the underlying buffer violates the concept of
a "stream" which is intended to provide forward only access,
and makes porting to llvm::raw_ostream more difficult in the
future.

Differential Revision: https://reviews.llvm.org/D26698

llvm-svn: 287152
2016-11-16 21:15:24 +00:00
Enrico Granata 7700de8c30 Add support to the ObjC type scavenger for finding types via debug info
llvm-svn: 285941
2016-11-03 17:25:27 +00:00
Enrico Granata f60216733f Add helpers for the notion of a type scavenger that is "either this or that" source, and one that is "both this and that" source
Use the helper to rewrite the ObjC type lookup logic (first modules, then runtime) in terms of an either scavenger

llvm-svn: 285736
2016-11-01 20:17:14 +00:00
Zachary Turner 4fa098a5c0 Convert UniqueCStringMap to use StringRef.
llvm-svn: 283494
2016-10-06 21:22:44 +00:00
Kate Stone b9c1b51e45 *** This commit represents a complete reformatting of the LLDB source code
*** to conform to clang-format’s LLVM style.  This kind of mass change has
*** two obvious implications:

Firstly, merging this particular commit into a downstream fork may be a huge
effort.  Alternatively, it may be worth merging all changes up to this commit,
performing the same reformatting operation locally, and then discarding the
merge for this particular commit.  The commands used to accomplish this
reformatting were as follows (with current working directory as the root of
the repository):

    find . \( -iname "*.c" -or -iname "*.cpp" -or -iname "*.h" -or -iname "*.mm" \) -exec clang-format -i {} +
    find . -iname "*.py" -exec autopep8 --in-place --aggressive --aggressive {} + ;

The version of clang-format used was 3.9.0, and autopep8 was 1.2.4.

Secondly, “blame” style tools will generally point to this commit instead of
a meaningful prior commit.  There are alternatives available that will attempt
to look through this change and find the appropriate prior commit.  YMMV.

llvm-svn: 280751
2016-09-06 20:57:50 +00:00
Enrico Granata 8ea99cd86f Add NSTaggedPointerString to the table of data formatters
Fixes rdar://27002512

llvm-svn: 274164
2016-06-29 21:00:18 +00:00
Enrico Granata f4d521836d Remove even more of the data formatters that silently run code
Fixes <rdar://problem/25629755>

llvm-svn: 265849
2016-04-08 21:24:24 +00:00
Enrico Granata aa05cf9980 Remove more of the code-running ObjC data formatter support
llvm-svn: 265181
2016-04-01 20:33:22 +00:00
Enrico Granata 35f94bb72c Make it so that the data formatter for NSError can see through a variable of type NSError**. Fixes rdar://25060684
llvm-svn: 263603
2016-03-15 23:20:10 +00:00
Enrico Granata 936499ae4c Add an LLDB data formatter for single-element NSArray and NSDictionary Cocoa containers
Fixes rdar://23715118

llvm-svn: 262254
2016-02-29 21:06:50 +00:00
Eugene Zelenko bbd16815b0 Fix Clang-tidy modernize-use-nullptr warnings in source/Plugins/Language; other minor fixes.
llvm-svn: 262246
2016-02-29 19:41:30 +00:00
Enrico Granata 11799e1529 Turns out, many people define structs named Point that do not share the same names that this formatter uses for fields; use the {} syntax to make it so that a failure to parse the summary doesn't cause the entire printout to fail
llvm-svn: 256042
2015-12-18 22:04:47 +00:00
Enrico Granata 608d67c152 Introduce a way for Languages to specify whether values of "reference types" are "nil" (not pointing to anything) or uninitialized (never made to point at anything)
This latter determination may or may not be possible on a per-language basis; and neither is mandatory to implement for any language

Use this knowledge in the ValueObjectPrinter to generalize the notion of IsObjCNil() and the respective printout

llvm-svn: 252663
2015-11-10 22:39:15 +00:00