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The orc jit API evolved as follows:
* Use better error handling via llvm::Error and llvm::Expected<>
* Switch back to the single llvm::Module concept as opposed to sets.
* Use more expressive ownership model: extensive use of smart ptrs.
Initializing the module manager overwrites the external Sema/AST sources
with the ASTReader.
As we are using our own sources in cling, we should manually initalize
the module manager when we are in the module mode before we set our
own custom sources (which respect any existing sources like the ones
created by the module manager).
We should setup our callbacks for ExternalASTSource/ExternalSemaSource
before we parse *any* code to prevent that any part of the code
stores a reference to a non-cling external sources. If this happens,
then the clang data structures such redecl chain could go out of
sync if they reference different sources and produce errors like failing
to merge declarations correctly or creating invalid redecl chains.
To fix this, we move this initalization before the initalization of
the incremental parser which is the first part that can generate
any AST nodes. We only do this for the modules case because in
the non-modules case the clang PCH overwrites our callback
in the ExternalASTSource and therefore would destroy our external
source.
We actually need those callbacks as they are responsible for
loading decls from unresolved identifiers, which then actually
triggers the loading of the specific header (or in our case
the specific C++ modules).
For now we need this as long as the modules are based on the
rootmap mechanism.
Initializing the module manager overwrites the external Sema/AST sources
with the ASTReader.
As we are using our own sources in cling, we should manually initalize
the module manager when we are in the module mode before we set our
own custom sources (which respect any existing sources like the ones
created by the module manager).
We should setup our callbacks for ExternalASTSource/ExternalSemaSource
before we parse *any* code to prevent that any part of the code
stores a reference to a non-cling external sources. If this happens,
then the clang data structures such redecl chain could go out of
sync if they reference different sources and produce errors like failing
to merge declarations correctly or creating invalid redecl chains.
To fix this, we move this initalization before the initalization of
the incremental parser which is the first part that can generate
any AST nodes.
Right now we always start generating a module in the CIFactory
when modules are enabled. However, we should only do that when
we actually want to generate a module according to the COpts
(e.g. the user has given a module that we should generate).
When generating the GQt module in rootcling, we hit the assertions
in forceAppend assertions about "Duplicates?!" with this declaration:
```
CXXRecordDecl 0x55555643fae8 </usr/include/qt4/QtCore/qglobal.h:1658:1, line:1794:1> line:1658:21 in GQt.TGQt.h hidden class QSysInfo definition
|-also in GQt.TQtClientWidget.h
|-CXXRecordDecl 0x55555643fc30 <col:1, col:21> col:21 in GQt.TGQt.h hidden implicit class QSysInfo
|-AccessSpecDecl 0x55555643fce8 <line:1659:1, col:7> col:1 in GQt.TGQt.h public
|-EnumDecl 0x55555643fd18 <line:1660:5, line:1662:5> line:1660:10 in GQt.TGQt.h hidden Sizes
| `-EnumConstantDecl 0x55555643fe98 <line:1661:9, col:38> col:9 in GQt.TGQt.h hidden WordSize 'enum QSysInfo::Sizes'
| `-ImplicitCastExpr 0x55555643fee0 <col:20, col:38> 'unsigned int' <IntegralCast>
| `-ParenExpr 0x55555643fe70 <col:20, col:38> 'unsigned long'
| `-BinaryOperator 0x55555643fe48 <col:21, col:37> 'unsigned long' '<<'
| |-UnaryExprOrTypeTraitExpr 0x55555643fe08 <col:21, col:34> 'unsigned long' sizeof 'void *'
| `-IntegerLiteral 0x55555643fe28 <col:37> 'int' 3
`-EnumDecl 0x55555643ff00 <line:1672:5, line:1685:5> line:1672:10 in GQt.TGQt.h hidden Endian
|-EnumConstantDecl 0x55555643ffd8 <line:1673:9> col:9 in GQt.TGQt.h hidden referenced BigEndian 'enum QSysInfo::Endian'
|-EnumConstantDecl 0x555556440028 <line:1674:9> col:9 in GQt.TGQt.h hidden referenced LittleEndian 'enum QSysInfo::Endian'
`-EnumConstantDecl 0x5555564400a0 <line:1681:11, col:23> col:11 in GQt.TGQt.h hidden ByteOrder 'enum QSysInfo::Endian'
`-ImplicitCastExpr 0x5555564400e8 <col:23> 'unsigned int' <IntegralCast>
`-DeclRefExpr 0x555556440070 <col:23> 'int' EnumConstant 0x555556440028 'LittleEndian' 'enum QSysInfo::Endian'
```
The reason for this is that we have QSysInfo both in the TQtClientWidget
and TGQt submodules and our current translation (which is supposed to
parse all header in the module) sees them both in one transaction.
As we also don't recognize that this decl is from a module, the code
fires the assert even though duplictes are expected with modules.
The reason why we don't recognize it as a declaration form an ASTFile
which disables the assert is that FromASTFile for the decls is
not set. This is because they haven't been loaded by the ASTFileReader
but are directly parsed as submodules in our special case where we
directly parse a module content from rootcling to generate it.
We just workaround in this patch by checking that if the decl is from
the currently generated module, we are pretending it's as if it was
loaded from an AST file.
This reverts commit 79ed4963868c758757c25b7d93ef98fac0e34774.
The commit tried to bring back the optimisation level to O0 but 2 tests fail
if this is done:
- roottest-cling-specialobj-reread
- roottest-root-io-datamodelevolution-make
Revert https://github.com/root-project/root/commit/548eca7 bringing back
optimisation level to O0 given the very long time needed to JIT simple
pieces of code.
This takes tens of seconds versus a few seconds:
using namespace ROOT::Experimental;
int test() {
// build a TDF with 1 event and 1 column "x" that is always equal 42
TDataFrame dd(1);
auto d = dd.Define("x", []() { return 42; });
// book nHistos histograms
// all with the same cut and filled with the same variable in this simple example
std::vector<TDF::TResultProxy<TH1D>> histos;
const auto nHistos = 1000u;
histos.reserve(nHistos);
for (auto i = 0u; i < nHistos; ++i)
histos.emplace_back(d.Histo1D("x"));
// run event loop, print something to be sure everything is ok
std::cout << histos.front()->GetMean() << std::endl;
return 0;
}
This teaches again the IncrementalExecutor to emit only one module at a time.
In the old MCJIT days, the API worked with module sets and cling assumed llvm's
jit infrastructure is moving in this direction.
LLVM 5.0 moves away from this concept and works with single llvm::Modules. This
patch will make the upgrade to LLVM 5.0 smoother.
The Visual Studio 2017 path is very different than the previous versions, and even the registry entries are completely different, so for now let's try the trivial way first (using the %VCToolsInstallDir% environment variable)
This is in prepare for the upcoming llvm upgrade. The future orc jit compile
layer needs a std::shared_ptr<llvm::Module>. The current design passes a
llvm::Module* around and any conversions to a shared_ptr cause the
destruction of the llvm::Module which is a long-lived object in cling.
With C++ modules we fail here because we get this extra 'include '
text before the actual header. As the header itself is correct
it seems, we just skip this extra text with modules enabled as
this code is anyway supposed to be replaced with modules
functionality.
We will probably see an increasing amount of these failures with
C++ modules as we now deserialize all declarations instead of just
the PCH ones. To safe us a lot of debugging time on where to push
the needed transaction, let's directly print the stack trace here
in the rare case that we crash here.
With the module generation in rootcling Clang rlies on AST consumers
to do the module generation work for it. Right now this doesn't work
however with the interpreter, as we just overwrite the deserialization
listener that clang added which will cause strange errors during
the module generation (the most prompinent error is that the number
of recorded submodules will be incorrect, as this it the first thing
that Clang checks before writing a module and which is recorded by
an ASTDeserializationListener).
This patch just adds a multiplexer here that allows us to keep the
old listener while also adding the one we have.
This patch adds support for writing out modules to the CIFactory.
If the user has passed -fmodule-name and -fmodules, we start
extending the CI instance with support for C++ modules and also
optionally setup AST consumers for writing out modules files
alongside the interpreter.
Without throwing cling cannot communicate to the caller that the code has failed,
as the user code is currently running when failing the dynamic expression evaluation.
Fixes gROOT->ProcessLine("doesNotExist", &res) not signalling any error through res.
Well, it still does not set res to an error - but at least it now throws.
Fixes an issue for ATLAS, where Property<string>::Property<string&> cannot be instantiated by ROOT.
ROOT is trying to do that because the function is templated, with all template parameters having defaults.
(This "let us instantiate if all template params have defaults" is needed e.g. to see pair::pair() which is sfinae protected.)
This is a preparation because we want to ship module configuration
files in the future in the cling resource directory (Clang VFS overlay
files and modulemaps). This means that we will need to know this path
in a few other places (e.g. where we specify the -ivfsoverlayPATH
arguments and potential -fmodule-map-file=PATH args)
It also makes this giant function a bit easier on the eyes.
So far we create our DeclCollector in the CIFactory and then tried to
get this variable back in the IncrementalParser by casting the
ASTConsumer of our compiler instance to a DeclCollector. This strategy
fails as soon as we want to have multiple collectors and start using
the clang multiplexer as this call will now fail (e.g. in this case to
have another ASTConsumer that looks in the C++ modules case for what
libraries we need to link - and the best way to add this is via
the multiplexed ASTConsumer that clang provides).
This patch moves the responsibility for the DeclCollector to the
caller that relies on getting a DeclCollector back, which is in this
case the constructor of IncrementalParser.
To use C++ modules during runtime we need to generate a modulemap
and install it alongside the ROOT headers. However, right now
we need to turn on cxxmodules to generate a modulemap, which would
force experiments to fulfill all the depndencies that cxxmodules
brings with it (that is, a modern clang that can build ROOT with C++
modules).
This patch untangles the modulemap generation from the cxxmodules
option, so that we always generate a modulemap even when cxxmodules
is turned off. We now also install the modulemap alongside
the ROOT headers.
No functional change for normal ROOT expected here, as the modulemap
will just be ignored without having runtime C++ modules enabled.
// clang currently supports native __float128 only on few targets, and
// this target does not have it. The most visible consequence of this is a
// specialization
// __is_floating_point_helper<__float128>
// in include/c++/6.3.0/type_traits:344 that clang then rejects. The
// specialization is protected by !if _GLIBCXX_USE_FLOAT128 (which is
// unconditionally set in c++config.h) and #if !__STRICT_ANSI__. Tweak the
// latter by disabling GNUMode.
Fixes duplicate definition errors with PCH, where the first definition is in the PCH, and the
second one is injected at runtime, after attaching the PCH.
This patch still exposes as many declarations as possible to fSyntaxOnly to validate their syntax.
If the Transaction that holds std::string type is unloaded LookupHelper::m_StringTy will point to invalid memory.
LookupHelper::findType can return an invalid QualType causing dereference of null.
Fixes a memory corruption seen after the llvm upgrade. This is still a terrible hack;
it will be replaced by a proper fix in clang::CodeGen (coming up).
