This patch makes sure that diagnostics from the prescanner are reported
when running `flang-new -E` (i.e. only the preprocessor phase is
requested). More specifically, the `PrintPreprocessedAction` action is
updated.
With this patch we make sure that the `f18` and `flang-new` provide
identical output when running the preprocessor and the prescanner
generates diagnostics.
Differential Revision: https://reviews.llvm.org/D94782
It's possible to declare deferred shape array using the POINTER
statement, for example:
POINTER :: var(:)
When analyzing POINTER declarations, we were not capturing the array
specification information, if present. I fixed this by changing the
"Post" function for "parser::PointerDecl" to check to see if the
declaration contained a "DeferredShapeSpecList". In such cases, I
analyzed the shape and used to information to declare an "ObjectEntity"
that contains the shape information rather than an "UnknownEntity".
I also added a couple of small tests that fail to compile without these
changes.
Differential Revision: https://reviews.llvm.org/D95080
* IsArrayElement() needs another option to control whether it
should ignore trailing component references.
* Add IsObjectPointer().
* Add const Scope& variants of IsFunction() and IsProcedure().
* Make TypeAndShape::Characterize() work with procedure bindings.
* Handle CHARACTER length in MeasureSizeInBytes().
* Fine-tune FindExternallyVisibleObject()'s handling of dummy arguments
to conform with Fortran 2018: only INTENT(IN) and dummy pointers
in pure functions signify; update two tests accordingly.
Also: resolve some stylistic inconsistencies and add a missing
"const" in the expression traversal template framework.
Differential Revision: https://reviews.llvm.org/D95011
F18 Clause 19.4p9 says:
The associate names of an ASSOCIATE construct have the scope of the
block.
Clause 11.3.1p1 says the ASSOCIATE statement is not itself in the block:
R1102 associate-construct is: associate-stmt block end-associate-stmt
Associate statement associations are currently fully processed from left
to right, incorrectly interposing associating entities earlier in the
list on same-named entities in the host scope.
1 program p
2 logical :: a = .false.
3 real :: b = 9.73
4 associate (b => a, a => b)
5 print*, a, b
6 end associate
7 print*, a, b
8 end
Associating names 'a' and 'b' at line 4 in this code are now both
aliased to logical host entity 'a' at line 2. This happens because the
reference to 'b' in the second association incorrectly resolves 'b' to
the entity in line 4 (already associated to 'a' at line 2), rather than
the 'b' at line 3. With bridge code to process these associations,
f18 output is:
F F
F 9.73
It should be:
9.73 F
F 9.73
To fix this, names in right-hand side selector variables/expressions
must all be resolved before any left-hand side entities are resolved.
This is done by maintaining a stack of lists of associations, rather
than a stack of associations. Each ASSOCIATE statement's list of
assocations is then visited once for right-hand side processing, and
once for left-hand side processing.
Note that other construct associations do not have this problem.
SELECT RANK and SELECT TYPE each have a single assocation, not a list.
Constraint C1113 prohibits the right-hand side of a CHANGE TEAM
association from referencing any left-hand side entity.
Differential Revision: https://reviews.llvm.org/D95010
The utility routine WhyNotModifiable() needed to become more
aware of the use of pointers in data-refs; the targets of
pointer components are sometimes modifiable even when the
leftmost ("base") symbol of a data-ref is not.
Added a new unit test for WhyNotModifiable() that uses internal
READ statements (mostly), since I/O semantic checking uses
WhyNotModifiable() for all its definability checking.
Differential Revision: https://reviews.llvm.org/D94849
Add Semantic checks for OpenMP 4.5 - 2.7.4 Workshare Construct.
- The structured block in a workshare construct may consist of only
scalar or array assignments, forall or where statements,
forall, where, atomic, critical or parallel constructs.
- All array assignments, scalar assignments, and masked array
assignments must be intrinsic assignments.
- The construct must not contain any user defined function calls unless
the function is ELEMENTAL.
Test cases : omp-workshare03.f90, omp-workshare04.f90, omp-workshare05.f90
Resolve test cases (omp-workshare01.f90 and omp-workshare02.f90) marked as XFAIL
Reviewed By: kiranchandramohan
Differential Revision: https://reviews.llvm.org/D93091
Add the following standard predefinitions that f18 supports:
* `__flang__`,
* `__flang_major__`,
* `__flang_minor__`,
* `__flang_patchlevel__`
Summary of changes:
- Populate Fortran::parser::Options#predefinitions with the default
supported predefinitions
Differential Revision: https://reviews.llvm.org/D94516
Currently the new flang driver always runs in free form mode. This patch
adds support for fixed form mode detection based on the file extensions.
Like `f18`, `flang-new` will treat files ending with ".f", ".F" and
".ff" as fixed form. Additionally, ".for", ".FOR", ".fpp" and ".FPP"
file extensions are recognised as fixed form files. This is consistent
with gfortran [1]. In summary, files with the following extensions are
treated as fixed-form:
* ".f", ".F", ".ff", ".for", ".FOR", ".fpp", ".FPP"
For consistency with flang/test/lit.cfg.py and f18, this patch also adds
support for the following file extensions:
* ".ff", ".FOR", ".for", ".ff90", ".fpp", ".FPP"
This is added in flang/lib/Frontend/FrontendOptions.cpp. Additionally,
the following extensions are included:
* ".f03", ".F03", ".f08", ".F08"
This is for compatibility with gfortran [1] and other popular Fortran
compilers [2].
NOTE: internally Flang will only differentiate between fixed and free
form files. Currently Flang does not support switching between language
standards, so in this regard file extensions are irrelevant. More
specifically, both `file.f03` and `file.f18` are represented with
`Language::Fortran` (as opposed to e.g. `Language::Fortran03`).
Summary of changes:
- Set Fortran::parser::Options::sFixedForm according to the file type
- Add isFixedFormSuffix and isFreeFormSuffix helper functions to
FrontendTool/Utils.h
- Change FrontendOptions::GetInputKindForExtension to support the missing
file extensions that f18 supports and some additional ones
- FrontendActionTest.cpp is updated to make sure that the test input is
treated as free-form
[1] https://gcc.gnu.org/onlinedocs/gfortran/GNU-Fortran-and-GCC.html
[2] https://github.com/llvm/llvm-project/blob/master/flang/docs/OptionComparison.md#notes
Differential Revision: https://reviews.llvm.org/D94228
Add support for option -I in the new Flang driver. This will allow for
included headers and module files in other directories, as the default
search path is currently the working folder. The behaviour of this is
consistent with the current f18 driver, where the current folder (i.e.
".") has the highest priority followed by the order of '-I's taking
priority from first to last.
Summary of changes:
- Add SearchDirectoriesFromDashI to PreprocessorOptions, to be forwarded
into the parser's searchDirectories
- Add header files and non-functional module files to be used in
regression tests. The module files are just text files and are used to
demonstrated that paths specified with `-I` are taken into account when
searching for .mod files.
Differential Revision: https://reviews.llvm.org/D93453
When a reference to a generic interface occurs in a specification
expression that must be emitted to a module file, we have a problem
when the generic resolves to a function whose name is inaccessible
due to being PRIVATE or due to a conflict with another use of the
same name in the scope. In these cases, construct a new name for
the specific procedure and emit a renaming USE to the module file.
Also, relax enforcement of PRIVATE when analyzing module files.
Differential Revision: https://reviews.llvm.org/D94815
The following driver invocation will generate an output file
in the same directory as the input file:
```
flang-new -fc1 -test-io test-input.f90
```
This is the desired behaviour. However, when testing we need to make
sure that we don't pollute the source directory. To this end, copy the
input file into a temporary directory before testing.
This is similar to https://reviews.llvm.org/D94243.
C843 states that "An entity with the INTENT attribute shall be a dummy
data object or a dummy procedure pointer." This change enforces that
and fixes some tests that erroneously violated this rule.
Differential Revision: https://reviews.llvm.org/D94781
Semantic checks added to check the worksharing 'single' region closely nested inside a worksharing 'do' region. And also to check whether the 'do' iteration variable is a variable in 'Firstprivate' clause.
Files:
check-directive-structure.h
check-omp-structure.h
check-omp-structure.cpp
Testcases:
omp-do01-positivecase.f90
omp-do01.f90
omp-do05-positivecase.f90
omp-do05.f90
Reviewed by: Kiran Chandramohan @kiranchandramohan , Valentin Clement @clementval
Differential Revision: https://reviews.llvm.org/D93205
When a use-associated procedure was included in a generic, we weren't
correctly recording that fact. The ultimate symbol was added rather than
the local symbol.
Also, improve the message emitted for the specific procedure by
mentioning the module it came from.
This fixes one of the problems in https://bugs.llvm.org/show_bug.cgi?id=48648.
Differential Revision: https://reviews.llvm.org/D94696
Generic type-bound interfaces for user-defined operators need to be formatted
as "OPERATOR(.op.)", not just ".op."
PRIVATE generics need to be marked as such.
Declaration ordering: when a generic interface shadows a
derived type of the same name, it needs to be emitted to the
module file at the point of definition of the derived type;
otherwise, the derived type's definition may appear after its
first use.
The module symbol for a module read from a module file needs
to be marked as coming from a module file before semantic
processing is performed on the contents of the module so that
any special handling for declarations in module files can be
properly activated.
IMPORT statements were sometimes missing for use-associated
symbols in surrounding scopes; fine-tune NeedImport().
Differential Revision: https://reviews.llvm.org/D94636
It's possible to declare an external procedure and then pass it as an
actual argument to a subprogram expecting a procedure argument. I added
tests for this and added an error message to distinguish passing an
actual argument with an implicit interface from passing an argument with
a mismatched explicit interface.
Differential Revision: https://reviews.llvm.org/D94505
If a module specifies default private accessibility, names that have
been use-associated are private by default. This was not reflected in
.mod files.
Differential Revision: https://reviews.llvm.org/D94602
In some contexts, including the motivating case of determining whether
the expressions that define the shape of a variable are "constant expressions"
in the sense of the Fortran standard, expression rewriting via Fold()
is not necessary, and should not be required. The inquiry intrinsics LBOUND,
UBOUND, and SIZE work correctly now in specification expressions and are
classified correctly as being constant expressions (or not). Getting this right
led to a fair amount of API clean-up as a consequence, including the
folding of shapes and TypeAndShape objects, and new APIs for shapes
that do not fold for those cases where folding isn't needed. Further,
the symbol-testing predicate APIs in Evaluate/tools.h now all resolve any
associations of their symbols and work transparently on use-, host-, and
construct-association symbols; the tools used to resolve those associations have
been defined and documented more precisely, and their clients adjusted as needed.
Differential Revision: https://reviews.llvm.org/D94561
`CheckNoBranching` is currently handling only illegal branching out for constructs
with `Parser::Name` in them.
Extend the same for handling illegal branching out caused by `Parser::Label` based statements.
This patch could possibly solve one of the issues(typically branching out) mentioned in D92735.
Reviewed By: kiranchandramohan
Differential Revision: https://reviews.llvm.org/D93447
Remove duplicated function to check for required clauses on a directive. This was
still there from the merging of OpenACC and OpenMP common semantic checks and it can now be
removed so we use only one function.
Reviewed By: sameeranjoshi
Differential Revision: https://reviews.llvm.org/D93575
The following frontend driver invocation will generate 2 output files
in the same directory as the input files:
```
flang-new -fc1 input-1.f input-2.f
```
This is the desired behaviour. However, when testing we need to make
sure that we don't pollute the source directory. To this end, copy test
input files into a temporary directory.
Differential Revision: https://reviews.llvm.org/D94243
Internal subprograms have explicit interfaces. If an internal subprogram has
an alternate return, we check its explicit interface. But we were not
putting the label values of alternate returns into the actual argument.
I fixed this by changing the definition of actual arguments to be able
to contain a common::Label and putting the label for an alternate return
into the actual argument.
I also verified that we were already doing all of the semantic checking
required for alternate returns and removed a "TODO" for this.
I also added the test altreturn06.f90.
Differential Revision: https://reviews.llvm.org/D94017
Add semantic check for most of the restrictions for the declare directive.
Reviewed By: kiranktp
Differential Revision: https://reviews.llvm.org/D92741
This patch adds a frontend action for emitting object files. While Flang
does not support code-generation, this action remains a placeholder.
This patch simply provides glue-code to connect the compiler driver
with the appropriate frontend action.
The new action is triggered with the `-c` compiler driver flag, i.e.
`flang-new -c`. This is then translated to `flang-new -fc1 -emit-obj`,
so `-emit-obj` has to be marked as supported as well.
As code-generation is not available yet, `flang-new -c` results in a
driver error:
```
error: code-generation is not available yet
```
Hopefully this will help communicating the level of available
functionality within Flang.
The definition of `emit-obj` is updated so that it can be shared between
Clang and Flang. As the original definition was enclosed within a
Clang-specific TableGen `let` statement, it is extracted into a new `let`
statement. That felt like the cleanest option.
I also commented out `-triple` in Flang::ConstructJob and updated some
comments there. This is similar to https://reviews.llvm.org/D93027. I
wanted to make sure that it's clear that we can't support `-triple`
until we have code-generation. However, once code-generation is
available we _will need_ `-triple`.
As this patch adds `-emit-obj`, the emit-obj.f90 becomes irrelevant and
is deleted. Instead, phases.f90 is added to demonstrate that users can
control compilation phases (indeed, `-c` is a phase control flag).
Reviewed By: SouraVX, clementval
Differential Revision: https://reviews.llvm.org/D93301
This patch adds some positive and failure tests for init and shutdown directives.
Reviewed By: kiranktp
Differential Revision: https://reviews.llvm.org/D90786
Add support for options -D and -U in the new Flang driver.
Summary of changes:
- Create PreprocessorOptions, to be used by the driver then translated
into Fortran::parser::Options
- Create CompilerInvocation::setFortranOpts to pass preprocessor
options into the parser options
- Add a dedicated method, Flang::AddPreprocessingOptions, to extract
preprocessing options from the driver arguments into the preprocessor
command arguments
Macros specified like -DName will default to definition 1.
When defining macros, the new driver will drop anything after an
end-of-line character. This is consistent with gfortran and clang, but
different to what currently f18 does. However, flang (which is a bash
wrapper for f18), also drops everything after an end-of-line character.
So gfortran-like behaviour felt like the natural choice. Test is added
to demonstrate this behaviour.
Reviewed By: awarzynski
Differential Revision: https://reviews.llvm.org/D93401
As per Flang's coding guidelines
(flang/docs/C++style.md#error-messages):
```
Messages should start with a capital letter.
```
This patch updates error messages in the driver (new and old) so that
they conform with the guideline above.
This change was suggested in one of the recent reviews:
https://reviews.llvm.org/D93712. It felt like this deserved a dedicated
patch, so sending it separately.
If either `Prescan` or `Parse` generate any fatal errors, the new driver
will:
* report it (i.e. issue an error diagnostic)
* exit early
* return non-zero exit code
This behaviour is consistent with f18 (i.e. the old driver).
Reviewed By: sameeranjoshi
Differential Revision: https://reviews.llvm.org/D93712
See OMP-5.0 2.19.5.5 task_reduction Clause.
To add a positive test case we need `taskgroup` directive which is not added hence skipping the test.
This is a dependency for `taskgroup` construct.
Reviewed By: clementval
Differential Revision: https://reviews.llvm.org/D93105
Co-authored-by: Valentin Clement <clementval@gmail.com>
When an abstract interface is defined, add the ABSTRACT attribute to
subprogram symbols that define the interface body. Make use of that
when writing .mod files to include "abstract" on the interface statement.
Also, fix a problem with the order of symbols in a .mod file. Sometimes
a name is mentioned before the "real" declaration, e.g. in an access
statement. We want the order to be based on the real definitions. In
these cases we replace the symbol name with an identical name with a
different source location. Then by sorting based on the source location
we get symbols in the right order.
Differential Revision: https://reviews.llvm.org/D93572
OpenMP 4.5 - Variables that appear in expressions for statement function definitions
may not appear in OpenMP Private, Firstprivate or Lastprivate clauses.
Test case : omp-private03.f90
Reviewed By: kiranchandramohan
Differential Revision: https://reviews.llvm.org/D93213
See OMP-5.0 2.19.5.5 task_reduction Clause.
To add a positive test case we need `taskgroup` directive which is not added hence skipping the test.
This is a dependency for `taskgroup` construct.
Reviewed By: clementval
Differential Revision: https://reviews.llvm.org/D93105
We were only checking the restrictions of IMPLICIT NONE(EXTERNAL) when a
procedure name is first encountered. But it can also happen with an
existing symbol, e.g. if an external function's return type is declared
before is it called. This change adds a check in that branch too.
Differential Revision: https://reviews.llvm.org/D93552
The behaviour triggered with this flag is consistent with `-fparse-only`
in `flang` (i.e. the throwaway driver). This new spelling is consistent
with Clang and gfortran, and was proposed and agreed on for the new
driver in [1].
This patch also adds some minimal logic to communicate whether the
semantic checks have failed or not. When semantic checks fail, a
frontend driver error is generated. The return code from the frontend
driver is then determined by checking the driver diagnostics - the
presence of driver errors means that the compilation has failed. This
logic is consistent with `clang -cc1`.
[1] http://lists.llvm.org/pipermail/flang-dev/2020-November/000588.html
Differential Revision: https://reviews.llvm.org/D92854
This patch add some checks for the restriction on the routine directive
and fix several issue at the same time.
Validity tests have been added in a separate file than acc-clause-validity.f90 since this one
became quite large. I plan to split the larger file once on-going review are done.
Reviewed By: sameeranjoshi
Differential Revision: https://reviews.llvm.org/D92672
Update the allowed clauses for the SERIAL construct for the new OpenACC 3.1
specification.
Reviewed By: sameeranjoshi
Differential Revision: https://reviews.llvm.org/D92123
Names in EQUIVALENCE statements are only allowed to indicate local
objects as per 19.5.1.4, paragraph 2, item (10). Thus, a name appearing
in an EQUIVALENCE statement with no corresponding declaration in the
same scope is an implicit declaration of the name. If that scope
contains an IMPLICIT NONE, it's an error.
I implemented this by adding a state variable to ScopeHandler to
indicate if we're resolving the names in an EQUIVALENCE statement and
then checked this state when resolving names. I also added a test to
the existing tests for EQUIVALENCE statements.
Differential Revision: https://reviews.llvm.org/D93345
Elemental intrinsic function folding was not taking the lower
bounds of constant array arguments into account; these lower bounds
can be distinct from 1 when named constants appear as arguments.
LLVM bugzilla #48437.
Differential Revision: https://reviews.llvm.org/D93321
Some operators have more than one name, e.g. operator(==), operator(.eq).
That was working correctly in generic definitions but they can also
appear in other contexts: USE statements and access statements, for
example.
This changes FindInScope to always look for each of the names for
a symbol. So an operator may be use-associated under one name but
declared private under another name and it will be the same symbol.
This replaces GenericSpecInfo::FindInScope which was only usable in
some cases.
Add a version of FindInScope() that looks in the current scope to
simplify many of the calls.
Differential Revision: https://reviews.llvm.org/D93344
STORAGE_SIZE() is a standard inquiry intrinsic (size in bits
of an array element of the same type as the argument); SIZEOF()
is a common extension that returns the size in bytes of its
argument; C_SIZEOF() is a renaming of SIZEOF() in module ISO_C_BINDING.
STORAGE_SIZE() and SIZEOF() are implemented via rewrites to
expressions; these expressions will be constant when the necessary
type parameters and bounds are also constant.
Code to calculate the sizes of types (with and without alignment)
was isolated into Evaluate/type.* and /characteristics.*.
Code in Semantics/compute-offsets.* to calculate sizes and alignments
of derived types' scopes was exposed so that it can be called at type
instantiation time (earlier than before) so that these inquiry intrinsics
could be called from specification expressions.
Differential Revision: https://reviews.llvm.org/D93322
When merging use associations into a generic, we weren't handling
the case where the name that was use associated was itself a use
association. This is fixed by following that association to its
ultimate symbol (`useUltimate` in `DoAddUse`).
An example of the bug is `m12d` in `resolve17.f90`. `g` is associated
with `gc` in `m12c` which is associated with `gb` in `m12b`. It was that
last association that we weren't correctly following.
Differential Revision: https://reviews.llvm.org/D93343
Remove resolved & moot TODO comments in Common/, Parser/,
and Evaluate/. Address a pending one relating to parsing
ambiguity in DATA statement constants, handling it with
symbol table information in Semantics and adding a test.
Differential Revision: https://reviews.llvm.org/D93323
From OMP 5.0 [2.17.8]
Restriction:
If memory-order-clause is release,acquire, or acq_rel, list items must not be specified on the flush directive.
Reviewed By: kiranchandramohan, clementval
Differential Revision: https://reviews.llvm.org/D89879
peter klausler