After #70144 Clang started resolving module maps even for
`__has_include()` expressions. This had the unintended consequence of
emitting diagnostics around header misuse. These don't make sense if you
actually don't bring contents of the header into the importer, so should
be skipped for `__has_include()`. This patch moves emission of these
diagnostics out of `Preprocessor::LookupFile()` up into
`Preprocessor::LookupHeaderIncludeOrImport()`.
When including builtin headers as part of a system module, ensure we use
relative paths to those headers. Otherwise the module will fail to compile
when specifying relative resource directories without extra search paths.
The `Module` parameter to `checkModuleIsAvailable` is currently passed
by pointer to non-const. However, it requires only const access and it
cannot be null. Change this to be a reference to const instead.
This then makes it obvious that it is an input-only parameter, so move
it to be before the in-out parameter for diagnostics.
CurLexer is dereferenced and should not be null in clang::Preprocessor::SkipExcludedConditionalBlock(clang::SourceLocation, clang::SourceLocation, bool, bool, clang::SourceLocation)
This patch adds an assert for NULL value check of pointer CurLexer and splits up all predicates so that, when/if a failure occurs, we'll be able to tell which predicate failed.
Reviewed By: tahonermann
Differential Revision: https://reviews.llvm.org/D158293
This does the rename for most internal uses of C2x, but does not rename
or reword diagnostics (those will be done in a follow-up).
I also updated standards references and citations to the final wording
in the standard.
D144654 made it so that we warn on any defining or undefining of
builtin macros. However the C and C++ standards only forbid the
defining or undefining of macros defined in the language standard
itself, but clang defines more macros than those and warning on those
may not be helpful.
Resolve this by only warning if the builtin macro name is the name of
a macro defined by the language. This is done in a way that removes
some of the existing checks, as those were made redundant by
restricting the warning in this way.
Differential Revision: https://reviews.llvm.org/D151741
This patch changes the argument type to `HeaderSearch::LookupFile()` from `const DirectoryEntry *` to `DirectoryEntryRef` in order to remove some calls to the deprecated `DirectoryEntry::getName()`.
Depends on D127660.
Reviewed By: bnbarham, benlangmuir
Differential Revision: https://reviews.llvm.org/D127663
This patch changes the type of `Preprocessor::MainFileDir` from `const DirectoryEntry *` to `Optional<DirectoryEntryRef>` in order to remove some calls to the deprecated `DirectoryEntry::getName()`.
Depends on D127658.
Reviewed By: bnbarham
Differential Revision: https://reviews.llvm.org/D127660
Currently we warn when MI->isBuiltinMacro, but this is only true for
builtin macros that require processing when expanding. Checking
SourceMgr.isWrittenInBuiltinFile in addition to this will mean that
we catch all builtin macros, though we shouldn't warn on feature test
macros.
As part of doing this I've also moved the handling of undefining from
CheckMacroName to HandleUndefDirective, as it doesn't really make
sense to handle undefining in CheckMacroName but defining in
HandleDefineDirective. It would be nice to instead handle both in
CheckMacroName, but that isn't possible as the handling of defines
requires looking at what the name is being defined to.
Differential Revision: https://reviews.llvm.org/D144654
This reverts commit 22e3f587fd1ff97185014cb1ba723579ed2150d3.
Breaks check-clang on arm, see https://reviews.llvm.org/D144654#4349954
Also reverts follow-up "[AArch64] Don't redefine _LP64 and __LP64__"
This reverts commit e55d52cd34fb7a6a6617639d147b9d0abaceeeab.
Currently we warn when MI->isBuiltinMacro, but this is only true for
builtin macros that require processing when expanding. Checking
SourceMgr.isWrittenInBuiltinFile in addition to this will mean that
we catch all builtin macros, though we shouldn't warn on feature test
macros.
As part of doing this I've also moved the handling of undefining from
CheckMacroName to HandleUndefDirective, as it doesn't really make
sense to handle undefining in CheckMacroName but defining in
HandleDefineDirective. It would be nice to instead handle both in
CheckMacroName, but that isn't possible as the handling of defines
requires looking at what the name is being defined to.
Differential Revision: https://reviews.llvm.org/D144654
During the ISO C++ Committee meeting plenary session the C++23 Standard
has been voted as technical complete.
This updates the reference to c++2b to c++23 and updates the __cplusplus
macro.
Drive-by fixes c++1z -> c++17 and c++2a -> c++20 when seen.
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D149553
The multiple-include optimization allows Clang to avoid opening a
files when they contain #pragma once or a proper include guard.
Both GCC and Microsoft Visual Studio allow null directives outside of
the #ifndef/#endif pair without disabling this multiple-include
optimization. GCC documents this behavior here
https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html.
> There must be no directives outside the controlling directive pair,
> but the null directive (a line containing nothing other than a
> single '#' and possibly whitespace) is permitted.
However, Clang disables the multiple-include optimization when
encountering the null directive.
In particular, this slows down preprocessing of most projects that
depend on boost as many boost libraries depend on the boost
preprocessor library, which contains null directives outside the
include guard on every header file.
Differential Revision: https://reviews.llvm.org/D147928
Currently when in -CC mode when processing a function like macro
ReadMacroParameterList(...) does not handle the case where there is a comment
embedded in the parameter-list.
Instead of using LexUnexpandedToken(...) I switched to using
LexUnexpandedNonComment(...) which eats comments while lexing.
Fixes: https://github.com/llvm/llvm-project/issues/60887
Differential Revision: https://reviews.llvm.org/D144511
GNU line marker directives are not recognised when preprocessing
assembly files, meaning they can't be used in the predefines file
meaning macros defined on the command line are reported as being
built-in.
Change this to permit line markers but only in the predefines file,
so we can correctly report command line macros as coming from the
command line.
Differential Revision: https://reviews.llvm.org/D145397
As the diagnostic message shows, we should remove -fmodules-ts flag in
clang/llvm17. Since clang/llvm16 is already branched. We can remove the
depreacared flag now.
This callback was removed with commit 7a124f4859, but we use it
downstream in ROOT/Cling to implement handling of a special include
syntax. Add back a "safe" version of the callback that only takes
the file name and return a bool to silently skip the file.
Differential Revision: https://reviews.llvm.org/D142196
Whenever we are compiling implementation of a framework (with the `-fmodule-name=FW` option), we never translate `#import <FW/Header.h>` to an import, regardless of whether "Header.h" belongs to "FW" or "FW_Private". For the same reasons, we also disallow `@import FW`. However, we still allow `@import FW_Private`. This patch disallows that a well, to be consistent with the rest of the rules.
Reviewed By: benlangmuir
Differential Revision: https://reviews.llvm.org/D142167
The needed tweaks are mostly trivial, the one nasty bit is Clang's usage
of OptionalStorage. To keep this working old Optional stays around as
clang::CustomizableOptional, with the default Storage removed.
Optional<File/DirectoryEntryRef> is replaced with a typedef.
I tested this with GCC 7.5, the oldest supported GCC I had around.
Differential Revision: https://reviews.llvm.org/D140332
This reverts commit 8f0df9f3bbc6d7f3d5cbfd955c5ee4404c53a75d.
The Optional*RefDegradesTo*EntryPtr types want to keep the same size as
the underlying type, which std::optional doesn't guarantee. For use with
llvm::Optional, they define their own storage class, and there is no way
to do that in std::optional.
On top of that, that commit broke builds with older GCCs, where
std::optional was not trivially copyable (static_assert in the clang
sources was failing).
This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated. The intent is to reduce
the amount of manual work required in migrating from Optional to
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
This list was originally used for to make sure MacroInfo's clever memory
management got called (1f1e4bdbf7815c), but that was
simplified in 73a29662b9bf640a and 1f1e4bdbf7815c, and there's nothing left.
Differential Revision: https://reviews.llvm.org/D136725
This is a follow-up to D134224. The original patch added new `ExcludedHeader` enumerator to `ModuleMap::ModuleHeaderRole` and started associating headers with the modules they were excluded from. This was necessary to consider their module maps as "affecting" in certain situations and in turn serialize them into the PCM.
The association of the header and module needs to be handled when deserializing the PCM as well, though. This patch fixes a potential assertion failure and a regression. This essentially reverts parts of feb54b6ded123f8118fdc20620d3f657dfeab485.
Reviewed By: Bigcheese
Differential Revision: https://reviews.llvm.org/D135381
Per the documentation, these restrictions were intended to apply to textual headers but previously this didn't work because we decided there was no requesting module when the `#include` was in a textual header.
A `-cc1` flag is provided to restore the old behavior for transitionary purposes.
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D132779
When Clang encounters `@import M.Private` during implicit build, it precompiles module `M` and looks through its submodules. If the `Private` submodule is not found, Clang assumes `@import M_Private`. In the dependency scanner, we don't capture the dependency on `M`, since it's not imported. It's an affecting module, though: compilation of the import statement will fail when implicit modules are disabled and `M` is not precompiled and explicitly provided. This patch fixes that.
Depends on D132430.
Reviewed By: benlangmuir
Differential Revision: https://reviews.llvm.org/D132502
When compiling a module, its semantics and Clang's behavior are affected by other modules. These modules are typically the **imported** ones. However, during implicit build, some modules end up being compiled and read without being actually imported. This patch starts tracking such modules and serializing them into `.pcm` files. This enables the dependency scanner to construct explicit compilations that mimic implicit build.
Reviewed By: benlangmuir
Differential Revision: https://reviews.llvm.org/D132430
The commit of af2d11b1d5c1508b506825df460656e0151cd3b0 missed a case where
the value of a suggested module needed to be reset to nullptr. Fixed thus
and added a testcase to cover the circumstance.
In the case of static compilation the file system is pretty much read-only
and taking a snapshot of it usually is sufficient. In the interactive C++
case the compilation is longer and people can create and include files, etc.
In that case we often do not want to open files or cache failures unless is
absolutely necessary.
This patch extends the original API call by forwarding some optional flags,
so we can continue use it in the previous way with no breakage.
Signed-off-by: Jun Zhang <jun@junz.org>
Differential Revision: https://reviews.llvm.org/D131241
The #warning directive is standard in C++2b and C2x,
this adjusts the pedantic and extensions warning accordingly.
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D130415
Diagnostic for `-Wauto-import` shouldn't be a warning because it doesn't
represent a potential problem in code that should be fixed. And the
emitted fix-it is likely to trigger `-Watimport-in-framework-header`
which makes it challenging to have a warning-free codebase. But it is
still useful to see how include directives are translated into modular
imports and which module a header belongs to, that's why keep it as a remark.
Keep `-Wauto-import` for now to allow a gradual migration for codebases
using `-Wno-auto-import`, e.g., `-Weverything -Wno-auto-import`.
rdar://79594287
Differential Revision: https://reviews.llvm.org/D130138
This addresses [cpp.include]/7
(when encountering #include header-name)
If the header identified by the header-name denotes an importable header, it
is implementation-defined whether the #include preprocessing directive is
instead replaced by an import directive.
In this implementation, include translation is performed _only_ for headers
in the Global Module fragment, so:
```
module;
#include "will-be-translated.h" // IFF the header unit is available.
export module M;
#include "will-not-be-translated.h" // even if the header unit is available
```
The reasoning is that, in general, includes in the module purview would not
be validly translatable (they would have to immediately follow the module
decl and without any other intervening decls). Otherwise that would violate
the rules on contiguous import directives.
This would be quite complex to track in the preprocessor, and for relatively
little gain (the user can 'import "will-not-be-translated.h";' instead.)
TODO: This is one area where it becomes increasingly difficult to disambiguate
clang modules in C++ from C++ standard modules. That needs to be addressed in
both the driver and the FE.
Differential Revision: https://reviews.llvm.org/D128981
"Ascii" StringLiteral instances are actually narrow strings
that are UTF-8 encoded and do not have an encoding prefix.
(UTF8 StringLiteral are also UTF-8 encoded strings, but with
the u8 prefix.
To avoid possible confusion both with actuall ASCII strings,
and with future works extending the set of literal encodings
supported by clang, this rename StringLiteral::isAscii() to
isOrdinary(), matching C++ standard terminology.
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D128762
