[flang] address comments

Original-commit: flang-compiler/f18@ccbb1a2036d818f167216ee6b107048afff3765c
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] More value semantics in Constant<> and GetScalarConstantValue

Original-commit: flang-compiler/f18@c7acce46854f815e2a1c53d385d8c39bae23098e
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] Convert structs to classes, move some defs from variable.h to call.h

Original-commit: flang-compiler/f18@c877a34694f041ab4d05f1d09c7105db10a90d41
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] fix f90_correct failure

Original-commit: flang-compiler/f18@1d9dac8ab57a5f56770a204857abed254b13fbf3
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] Fix instantiation of PDT bindings

Original-commit: flang-compiler/f18@8dcfe0c70b2b17d8c46c5e7659986c4bc7cd7762
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] add conversions to array constructor test

Original-commit: flang-compiler/f18@881c195a265296aa865bfe35aff006aeec3b3f61
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] Address review comments, fix some f90_correct failures

Original-commit: flang-compiler/f18@e468f8cd54f95b83acdcafd3e1909cef98293cd3
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] pass tests

Original-commit: flang-compiler/f18@db22dc22946eae605a4adfeb5a5becdb5bf63560
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] array constructor folding with test

Original-commit: flang-compiler/f18@37e7a8e666eae80d4d5485e8c9c59bfb23d08fa9
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] folding array constructors

Original-commit: flang-compiler/f18@a4e045fc5a913c7c3814820bf662205cc7687f1e
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] support Constant arrays

Original-commit: flang-compiler/f18@a92d8a404fc44d593890d79d59cf62630399d639
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] Run expression semantic analysis with rest of semantics.

checkpoint array constructor semantics work

checkpoint

array constructors of lengthless intrinsic types

checkpoint

Correct ambiguous substring refs misparsed as array elements

Original-commit: flang-compiler/f18@2232549efe42a2ef97725a131ac642b9be9274f4
Reviewed-on: https://github.com/flang-compiler/f18/pull/271
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#272 from flang-compiler/pmk-fix

Fix bugs flang-compiler/f18#269 & flang-compiler/f18#270

Original-commit: flang-compiler/f18@f9aecb6330ec41dcc34adf86b137308d6356a4cf
Reviewed-on: https://github.com/flang-compiler/f18/pull/272

[flang] Update fix based on comment

Original-commit: flang-compiler/f18@52dfd3b5dcdd84e5146875a6afdd075fe4acd9d4
Reviewed-on: https://github.com/flang-compiler/f18/pull/272

[flang] Fix bugs flang-compiler/f18#269 & flang-compiler/f18#270

Original-commit: flang-compiler/f18@639816f3efa7907d07c724e15d13afa5d4fe7794
Reviewed-on: https://github.com/flang-compiler/f18/pull/272
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#273 from flang-compiler/pmk-subnormal

Use IEEE-754 terminology better: subnormal, not denormal(ized)

Original-commit: flang-compiler/f18@700613d423bb265a6c5962197318478e4ba161d2
Reviewed-on: https://github.com/flang-compiler/f18/pull/273

[flang] Use IEEE-754 terminology better: subnormal, not denormal(ized)

Original-commit: flang-compiler/f18@57b0ebb5580a57d4dae44565d74e7ab19b88662b
Reviewed-on: https://github.com/flang-compiler/f18/pull/273

[flang] Fixes issue flang-compiler/f18#267 (GetScalarConstantValue)

 Merge pull request flang-compiler/f18#268 from flang-compiler/jpr0

Original-commit: flang-compiler/f18@d29624b54245936cbe87885e6cfb1d674b8449ec

[flang] Cleaned folding test helper template

Original-commit: flang-compiler/f18@b402c0a09caf079d2a0a44ac339894412c491e74

[flang] Add test related to issue flang-compiler/f18#267

Original-commit: flang-compiler/f18@a9b2a05f7533546d5f791d5558017c45430e1077
Tree-same-pre-rewrite: false

[flang] Fix issue flang-compiler/f18#267 (GetScalarConstantValue)

Original-commit: flang-compiler/f18@9fcbd09a51e935572e63bab6a5b30206375b24f6
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#227 from flang-compiler/jpr0

 Implement CFI_set_pointer, CFI_section, CFI_select_part. Minor changes in other CFI funcs

Original-commit: flang-compiler/f18@357f3d67da756c7b7542e893b9cfab4af393b740
Reviewed-on: https://github.com/flang-compiler/f18/pull/227

[flang] Removed unnecessary reinterpret_cast.

Original-commit: flang-compiler/f18@dd08a7fd3c899aacf51c85fff57692cf16ce92a3
Reviewed-on: https://github.com/flang-compiler/f18/pull/227

[flang] Fix: CFI_type_char is now considered Fortran CHARACTER

Original-commit: flang-compiler/f18@7c23573bd9630976daf9368913a4d7b71d1ffb3e
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] Added nullptr check in CFI functions returning error codes

Original-commit: flang-compiler/f18@5213d3a92119e509a173aa74abbe794a70b0c9aa
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] Changed CFI_CDESC_T c++ macro and various other comment fixes
 -  CFI_CDESC_T can now be cast to CFI_cdesc_t without using
    reinterpret_cast.
 -  Use {} initialization everywhere according to style guideline
 -  Avoid useless parentheses
 -  Do not use static storage when useless in tests.
 -  Reodered some loops that were confusing in tests

Original-commit: flang-compiler/f18@d0ed631dfdabfb162e3518f7e950ea4f9853c71a
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] editorial change after review

Original-commit: flang-compiler/f18@92339ea11a09323cda461da0e69a52a006cf6df8
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] fix review comments

Original-commit: flang-compiler/f18@5d9ef043a63a7e9beac3af632ba51f85931742a6
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] Comment typos correction

Original-commit: flang-compiler/f18@107c10563656164de091b806bf5d31faecb503cd
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] Set lower bounds to 0 in CFI_establish, CFI_select_part and CFI_setpointer

Original-commit: flang-compiler/f18@65c67347d9530cce293f1f90089fb4e8186ccabc
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] CFI_allocate: fixed CFI_type_char/cptr

Original-commit: flang-compiler/f18@ba9274d3ee7e24c0b2be48c1ba32e9682cbc4f18
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] CFI_set_pointer, CFI_section, CFI_select_part and tests

Original-commit: flang-compiler/f18@e3830c5878d7dbcdcc2652ac5ab97ddca6be60a7
Reviewed-on: https://github.com/flang-compiler/f18/pull/227
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#265 from flang-compiler/pmk0

Enable shared library build without dependence cycle between binaries

Original-commit: flang-compiler/f18@bcd1a5f38baa0df58d044526a5fb21136e78e664
Reviewed-on: https://github.com/flang-compiler/f18/pull/265

[flang] update copyright date

Original-commit: flang-compiler/f18@c9dbc96042d4f73d6a8679f08a7eddfa4ddd6d98
Reviewed-on: https://github.com/flang-compiler/f18/pull/265

[flang] tweak CMakeLists.txt options

Original-commit: flang-compiler/f18@64ba0c0d6e55a1dadc949ede016edb1f39a6ee7c
Reviewed-on: https://github.com/flang-compiler/f18/pull/265
Tree-same-pre-rewrite: false

[flang] Remove SHARED from add_library(), use cmake command line option instead

Original-commit: flang-compiler/f18@6644c799a7dc583331bea9853700c2ba69bbab4e
Reviewed-on: https://github.com/flang-compiler/f18/pull/265
Tree-same-pre-rewrite: false

[flang] Add SHARED to add_library() invocations so f18 libraries are always built shared.

Original-commit: flang-compiler/f18@060ced04c74b8796c7621a29da86ee2051d3ccba
Reviewed-on: https://github.com/flang-compiler/f18/pull/265
Tree-same-pre-rewrite: false

[flang] Enable building f18 as shared libraries

Original-commit: flang-compiler/f18@4544d75af1b45e4c554a35327461311cff974884
Reviewed-on: https://github.com/flang-compiler/f18/pull/265
Tree-same-pre-rewrite: false

[flang] Rearrange code to eliminate dependence cycles between f18 library binaries

Original-commit: flang-compiler/f18@88651eecae9cf7d5ea698eabcb315b3f2f169485
Reviewed-on: https://github.com/flang-compiler/f18/pull/265
Tree-same-pre-rewrite: false

[flang] Move default intrinsic type kinds from lib/semantics to lib/common

Original-commit: flang-compiler/f18@887e72dd613f411808d1b9e9e7b64601a3b67af8
Reviewed-on: https://github.com/flang-compiler/f18/pull/265
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#266 from flang-compiler/pmk-x86

Make x86 fp flag edge case behavior emulation conditional.

Original-commit: flang-compiler/f18@f21c9427fcc8024c30ec70d0a2eb8926ad1bbe50
Reviewed-on: https://github.com/flang-compiler/f18/pull/266

[flang] Make x86 fp behavior emulation conditional.

Original-commit: flang-compiler/f18@0c77a634b328b310206ccb00d7f40fcc9178f121
Reviewed-on: https://github.com/flang-compiler/f18/pull/266

[flang] Merge pull request flang-compiler/f18#264 from flang-compiler/pmk1

Fix crash reported by Jean in error recovery case

Original-commit: flang-compiler/f18@e2117d367bc616f32639f1551db5f32fa5f6b49e
Reviewed-on: https://github.com/flang-compiler/f18/pull/264

[flang] Fix crash reported by Jean in error recovery case

Original-commit: flang-compiler/f18@33db1790be41cb7e905d4bd0acf90222ddaf27e1
Reviewed-on: https://github.com/flang-compiler/f18/pull/264

[flang] Merge pull request flang-compiler/f18#260 from flang-compiler/pmk2

Complete parameterized derived type instantiation

Original-commit: flang-compiler/f18@3ecceb30d7e408116078fa9c9c7a95ff810f4ba8
Reviewed-on: https://github.com/flang-compiler/f18/pull/260

[flang] fix clang build warning

Original-commit: flang-compiler/f18@799fe63779206c19a9717e84678546f592d3218c
Reviewed-on: https://github.com/flang-compiler/f18/pull/260

[flang] done with merge

Original-commit: flang-compiler/f18@9c63eb7a1a87bcd075938b4ec93a45ef5bd4c1bf
Reviewed-on: https://github.com/flang-compiler/f18/pull/260
Tree-same-pre-rewrite: false

[flang] merge with master, implement a TODO with LEN on ASSOCIATE

Original-commit: flang-compiler/f18@e4501c6fa4e9819dd34c58f6d462c1482ea2332e
Reviewed-on: https://github.com/flang-compiler/f18/pull/260
Tree-same-pre-rewrite: false

[flang] basic skeleton of assignment analyzer

remove needless template<> on some function overloads

dodge bogus compiler warning from gcc 8.1.0 only

stricter typing of expressions in symbols

adjust modfile12.f90 expected test results

add Unwrap, massage folding a bit

Use Unwrap to simplify folding

Move KindSelector analysis into expression semantics

fix crash

checkpoint

updates to TypeParamInquiry

support of %KIND type parameter inquiry

equality testing for expressions

checkpoint during PDT implementation

reformat

checkpoint derived type instantiation

checkpoint

resolve merge

debugging failed tests

fix failing resolve37.f90 test

all existing tests pass

clean up all build warnings

fix bug

update copyright dates

fix copyright dates

address review comments

review comment

merge with master after peeling off changes

bugfixing new feature

fix warning from old g++s

tweaks after merging with latest head

more bugfixing

making modfile17.f90 test work

Make kinds into expressions in symbol table types

big refactor for deferring kinds in intrinsic types

modfile17.f90 test passes

clean up TODOs

Simplify types as stored in scopes

Test KIND parameter default init expressions, debug them

Update copyright dates

address comments

remove dead line

address comments

Original-commit: flang-compiler/f18@1f43d0a04813dc02909e9952ee479d13f630df4c
Reviewed-on: https://github.com/flang-compiler/f18/pull/260
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#262 from flang-compiler/tsk4

Fix link error from last integration

Original-commit: flang-compiler/f18@2d8c0f3e08128f3bde3892dd8e508a8798eda377
Reviewed-on: https://github.com/flang-compiler/f18/pull/262

[flang] Fix link error from last integration

We need to be able to analyze the `Variable` in a `Selector` and an
expression. That worked in a previous iteration of `expression.h` by
analyzing each variant of `Variable`.

This fix adds an explicit public function to analyze a Variable and
return a `MaybeExpr`.

Original-commit: flang-compiler/f18@9848a5d48f61f969f11814749c517990f76f6b04
Reviewed-on: https://github.com/flang-compiler/f18/pull/262

[flang] Merge pull request flang-compiler/f18#261 from flang-compiler/tsk2

Resolve names in ASSOCIATE and SELECT TYPE

Original-commit: flang-compiler/f18@2e6932fb4a275f75485fbf648abd751b8002fa90
Reviewed-on: https://github.com/flang-compiler/f18/pull/261

[flang] Fix typo

Original-commit: flang-compiler/f18@27af745986699f6859580285dffedb917afe3a0b
Reviewed-on: https://github.com/flang-compiler/f18/pull/261

[flang] Resolve names in ASSOCIATE and SELECT TYPE

Create `AssocEntityDetails` for symbols that represent entities
identified by the associate-name in ASSOCIATE and SELECT TYPE
constructs.

For ASSOCIATE, create a new scope for the associated entity.
For SELECT TYPE, create a new scope for each of type guard blocks.
Each one contains an associated entity with the appropriate type.

For SELECT TYPE, also create a place-holder symbol for the
associate-name in the SELECT TYPE statement. The real symbols
are in the new scopes and none of them is uniquely identified
with the associate-name.

Handling of `Selector` is common between these, with
`associate-name => expr | variable` recorded in
`ConstructVisitor::association_`.

When the selector is an expression, derive the type of the associated
entity from the type of the expression. This required some refactoring
of how `DeclTypeSpec`s are created. The `DerivedTypeSpec` that comes
from and expression is const so we can only create const `DeclTypeSpec`s
from it. But there were times during name resolution when we needed to
set type parameters in the current `DeclTypeSpec`. Now the non-const
`DerivedTypeSpec` is saved separately from the const `DeclTypeSpec`
while we are processing a declaration type spec. This makes it
unnecessary to save the derived type name.

Add a type alias for `common::Indirection` to reduce verbosity.

Original-commit: flang-compiler/f18@b7668cebe49a122ea23c89c81eafdeba243bbfaf
Reviewed-on: https://github.com/flang-compiler/f18/pull/261
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#259 from flang-compiler/eas2

Eas2

Original-commit: flang-compiler/f18@15fed726326d226ebe2031a1ff3854b8a069251e
Reviewed-on: https://github.com/flang-compiler/f18/pull/259

[flang] changes per review comments

Original-commit: flang-compiler/f18@8a3b5b595339e18634e870f42f5cd053187f89e0
Reviewed-on: https://github.com/flang-compiler/f18/pull/259

[flang] Fix typos on superscripts.

Original-commit: flang-compiler/f18@c9755c28f06535a5f8fd78ff4a29b1d0a1ee7604
Reviewed-on: https://github.com/flang-compiler/f18/pull/259
Tree-same-pre-rewrite: false

[flang] Add the Fortran IR document.

Original-commit: flang-compiler/f18@35a8c66e13d4e6f54fc7ead085ca7258f0a90099
Reviewed-on: https://github.com/flang-compiler/f18/pull/259
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#258 from flang-compiler/pmk1

cherrypick expression changes

Original-commit: flang-compiler/f18@470b03caee0faba437202648054a23642ea1b25d
Reviewed-on: https://github.com/flang-compiler/f18/pull/258

[flang] address review comments

Original-commit: flang-compiler/f18@e770e52cb10d895f082d9991a756199dd1fd1e0d
Reviewed-on: https://github.com/flang-compiler/f18/pull/258

[flang] remove debugging output

Original-commit: flang-compiler/f18@3a156953c211591cdda31b3eb8cc1fe40d18b84b
Reviewed-on: https://github.com/flang-compiler/f18/pull/258
Tree-same-pre-rewrite: false

[flang] cherrypick expression changes

Original-commit: flang-compiler/f18@427e267722b01af6b0bc8b41a224d49334382a1a
Reviewed-on: https://github.com/flang-compiler/f18/pull/258
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#256 from flang-compiler/tsk6

More name resolution

Original-commit: flang-compiler/f18@3ea1c3bf4c596a3e3c4eb42189148bd0c58b54ab
Reviewed-on: https://github.com/flang-compiler/f18/pull/256

[flang] Resolve %kind and %len on intrinsic types

A `part-ref` can be `%kind` on an entity of any intrinsic type or
`%len` on a character entity. During name resolution, recognize these
and don't report an error as if they are component references.

Create symbols for these names as well as `%re` and `%im`. This is
partly for completeness so that we don't get warnings about unresolve
names. It also allows us to avoid having to do string comparisons on
these names in more than one place.

Rework `AnalyzeExpr` on structure components to make use of these
symbols and also not treat `%kind` and `%len` as derived type component
references.

Original-commit: flang-compiler/f18@65ae81ebacbe75094d7ec7d83ae3a0f35eb591d2
Reviewed-on: https://github.com/flang-compiler/f18/pull/256

[flang] Fix crash evaluating kind expression

If we fail to evaluate the kind expression we were getting an invalid
optional reference. Instead, fail with an assert. This can happen if an
intrinsic function is not folded, but that will be implemented
eventually.

Original-commit: flang-compiler/f18@3bdbfc34bb75e6585eea57aa3240c3c825fff704
Reviewed-on: https://github.com/flang-compiler/f18/pull/256
Tree-same-pre-rewrite: false

[flang] Bug fix: pass right value as MiscDetails::Kind

Original-commit: flang-compiler/f18@94d63399bdf5409d59107f6681905f60dfe2b639
Reviewed-on: https://github.com/flang-compiler/f18/pull/256
Tree-same-pre-rewrite: false

[flang] Resolve name in PASS and BIND attributes

These are recognized along with other attributes and saved in
`passName_` and `bindName_`. The functions `SetPassNameOn()` and
`SetBindNameOn()` set them in a symbol if they are present.
They are also written to `.mod` files.

Add `MakePlaceholder()` to make symbols for names that otherwise
wouldn't have one. This allows us to assign a symbol to every name
and report errors for those that don't have one. Make use of this
for PASS names, which don't have explicit symbols.

Change `ObjectEntityDetails` and `ProcEntityDetails` to be sub-classes
of `EntityDetails`. They each contain a superset of the information in
`EntityDetails` so this reduces some duplication.

Original-commit: flang-compiler/f18@404c920840880bf63bb3b0984cb0e1213057d619
Reviewed-on: https://github.com/flang-compiler/f18/pull/256
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#248 from pjh40/pjh2

Define non-inline versions of ExpressionBase::derived()

Original-commit: flang-compiler/f18@f78bba7490417d0db547007ea2db990c46434936
Reviewed-on: https://github.com/flang-compiler/f18/pull/248

[flang] Added preprocessor directives to limit the use of non-inline ExpressionBase<A>::derived to GCC on Mac (inlined on all other platforms)

Original-commit: flang-compiler/f18@b38b31909a4d30e3cfd77353d44ecff06ef425da
Reviewed-on: https://github.com/flang-compiler/f18/pull/248

[flang] Addresses issue flang-compiler/f18#242 by making non-inline definitions for the two versions
of ExpressionBase::derived().  gcc-8.2 on macOS was choosing to create
non-inline instances of derived() during the explicit instantiations of
ExpressionBase in expression.cc and fold.cc.  During linking of any
executable, the linker failed when it found these duplicate definitions.

While this solution works, it removes the opportunity to inline the trivial
derived() functions.  Another solution would be to make all of the
templates related to ExpressionBase in expression.cc and fold.cc available
in a single .cc file, where the explicit instantiation
FOR_EACH_TYPE_AND_KIND(template class ExpressionBase) is done once. This
approach would allow inlining, but require something like template
implementation headers that could be included into the instantiation .cc
file.

Original-commit: flang-compiler/f18@074de39418299e7e53b437adfbbc381004e0886e
Reviewed-on: https://github.com/flang-compiler/f18/pull/248
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#255 from flang-compiler/pmk1

Minor clean-up after a merge

Original-commit: flang-compiler/f18@4bd4a2045fbe4a12d69543ba23d59cf12f52e89b
Reviewed-on: https://github.com/flang-compiler/f18/pull/255

[flang] Restore readability improvement from code review comment that did not make it into a merge into master, and repair expected test results.

Original-commit: flang-compiler/f18@4f1946765e5a3d6ad013e6342f3762d62a67f363
Reviewed-on: https://github.com/flang-compiler/f18/pull/255

[flang] address review comment

Original-commit: flang-compiler/f18@3542f648130a506428d340732f79c2250a91568f
Reviewed-on: https://github.com/flang-compiler/f18/pull/255
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#254 from flang-compiler/pmk3

Roll up small tweaks to parser and semantics.

Original-commit: flang-compiler/f18@36601dd6ecc6bd7955b6098ad5f00491ec79cec7
Reviewed-on: https://github.com/flang-compiler/f18/pull/254

[flang] Roll up small tweaks to parser and semantics.

Original-commit: flang-compiler/f18@57d823a8098d6e74965d6af43cd58077e6ffcea2
Reviewed-on: https://github.com/flang-compiler/f18/pull/254

[flang] Merge pull request flang-compiler/f18#253 from flang-compiler/pmk1

Symbol changes for PDT instantiation

Original-commit: flang-compiler/f18@d3c16c6a806becea2829928c499e948026579ecd
Reviewed-on: https://github.com/flang-compiler/f18/pull/253

[flang] fold analyzed bounds expressions

Original-commit: flang-compiler/f18@17810319ae0236045c510c2c25d23a6fc32956ff
Reviewed-on: https://github.com/flang-compiler/f18/pull/253

[flang] fix copyright dates

Original-commit: flang-compiler/f18@75818658d973abbae9cca646a1d6db1cfac591f8
Reviewed-on: https://github.com/flang-compiler/f18/pull/253
Tree-same-pre-rewrite: false

[flang] Update copyright dates.

Original-commit: flang-compiler/f18@8a7722621b29a551d564231c4734f0b42689ac8f
Reviewed-on: https://github.com/flang-compiler/f18/pull/253
Tree-same-pre-rewrite: false

[flang] fix comment

Original-commit: flang-compiler/f18@2b06aff9b4134d22ea2d9b2c03fa2846ed132a65
Reviewed-on: https://github.com/flang-compiler/f18/pull/253
Tree-same-pre-rewrite: false

[flang] Symbol changes for PDT instantiation

Original-commit: flang-compiler/f18@0c545a026d02955bffade6d15d3776c1de1b182e
Reviewed-on: https://github.com/flang-compiler/f18/pull/253
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#252 from flang-compiler/pmk3

Roll up folding & expression changes

Original-commit: flang-compiler/f18@608139c1606b00a25c3e127d6237e74a2b74d81b
Reviewed-on: https://github.com/flang-compiler/f18/pull/252

[flang] update copyright dates

Original-commit: flang-compiler/f18@99f4c98ccb750b7ea534f459aaef7c6ce5c245a2
Reviewed-on: https://github.com/flang-compiler/f18/pull/252

[flang] Roll up folding & expression changes

Original-commit: flang-compiler/f18@60affece05d4793bc81dcab36106790d02bb40cb
Reviewed-on: https://github.com/flang-compiler/f18/pull/252
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#251 from flang-compiler/pmk3

Support operator== for expressions.

Original-commit: flang-compiler/f18@b43f5fa5839230f0adb667ee47bc627427148cbe
Reviewed-on: https://github.com/flang-compiler/f18/pull/251

[flang] Support operator== for expressions.

Original-commit: flang-compiler/f18@42013513e9477d9c97c20c7e5ae01a485bb7d7e3
Reviewed-on: https://github.com/flang-compiler/f18/pull/251

[flang] Merge pull request flang-compiler/f18#250 from flang-compiler/pmk1

Change expression constraint checking

Original-commit: flang-compiler/f18@c40ce62f12a6c62406327d576479d375708fd284
Reviewed-on: https://github.com/flang-compiler/f18/pull/250

[flang] final clean-up

Original-commit: flang-compiler/f18@b971754a20d7f922598cef28fe5862776e8e5c89
Reviewed-on: https://github.com/flang-compiler/f18/pull/250

[flang] Remove a little now-dead code.

Original-commit: flang-compiler/f18@f000fb974c992ac4e68ace562ecd9db23b9a8b46
Reviewed-on: https://github.com/flang-compiler/f18/pull/250
Tree-same-pre-rewrite: false

[flang] update error message texts in test

Original-commit: flang-compiler/f18@42c0d5d950aba45b5ed0463345d5508631648b03
Reviewed-on: https://github.com/flang-compiler/f18/pull/250
Tree-same-pre-rewrite: false

[flang] Rework expression constraint checking

Original-commit: flang-compiler/f18@7a31c1ed2ba3c57575d3bd98f6b13dfc94a07af0
Reviewed-on: https://github.com/flang-compiler/f18/pull/250
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#249 from flang-compiler/tsk3

Various name resolution improvements

Original-commit: flang-compiler/f18@a7c41c0ccdf0131d75cdd8c6165153c23e73b62b
Reviewed-on: https://github.com/flang-compiler/f18/pull/249

[flang] Add support for type-bound generics

Record the bindings in a symbol with GenericBindingDetails, including
bindings inherited from extended types. Check that they have consistent
accessibility.

Original-commit: flang-compiler/f18@0f780abcea829d807493cf6a71eab9d8cffd4673
Reviewed-on: https://github.com/flang-compiler/f18/pull/249

[flang] Handle structure constructor in entity-decl

As with array constructors, we can encounter a decl-type-spec for a
structure-constructor while the decl-type-spec for the
type-declaration-stmt is still active. So here too we need to save and
restore the state.

In this case, it is done in DeclarationVisitor, so add
SetDeclTypeSpecState() to get and set the state.

Example where this occurs:
```
type(t(2)) :: x = t(2)()
```

Original-commit: flang-compiler/f18@aa5ca8d7b21d75ecd3c66a59589efd3ebb66af48
Reviewed-on: https://github.com/flang-compiler/f18/pull/249
Tree-same-pre-rewrite: false

[flang] Fix bug making symbol for external procedure

When we encounter a ProcedureDesignator, if it is an external procedure
(i.e. there is no visible declaration) it must be implicitly created in
the global scope, not the current scope.

If there is already a symbol there (i.e. a module) it is an error, even
if that symbol is not visible due to an IMPORT statement.

Original-commit: flang-compiler/f18@835e234ded3f4f9b47565c46fcbf42e25e966550
Reviewed-on: https://github.com/flang-compiler/f18/pull/249
Tree-same-pre-rewrite: false

[flang] Handle array constructor in entity-decl

We can encounter a decl-type-spec for an array constructor while the
decl-type-spec for type-declaration-stmt is still active:
```
integer, allocatable :: a(:) = [integer :: 1, 2, 3]
```

To handle this, save the state of the current decl-type-spec while
processing the second one, then restore when done.

Original-commit: flang-compiler/f18@d125a0f612a320bd6faa103665ddfe0cb48199d9
Reviewed-on: https://github.com/flang-compiler/f18/pull/249
Tree-same-pre-rewrite: false

[flang] Resolve names in ProcedureStmt and GenericStmt

We need to save the names of specific procedures that appear in a
ProcedureStmt or GenericStmt to resolve at the end of the specification
section. They may be forward references to interface bodies.

We were saving them in the GenericDetails but that was not the right
place: we need to save the parser::Name so that we can eventually
resolve it to a Symbol, but the symbol table should not contains
references to Name because they go away with the parse tree.

The fix is to save the mapping in a new multimap, specificProcs_ in
InterfaceVisitor. We can reference parser::Names there and resolve them
during ResolveSpecificsInGenerics(). We no longer need to clutter
GenericDetails with data structures for unresolved names.

Also handle the case where a specific procedure is use-associated from
another module.

Original-commit: flang-compiler/f18@c7f7b1e72da58a125fcc9ca6ea9cb23a8d4a1c6c
Reviewed-on: https://github.com/flang-compiler/f18/pull/249
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#247 from flang-compiler/tsk3

Support character types

Original-commit: flang-compiler/f18@2884608901c4cced1f3860058afca832499bb218
Reviewed-on: https://github.com/flang-compiler/f18/pull/247

[flang] Handle TypeStar and ClassStar in GetSymbolType()

Add DeclTypeSpec::AsDerived() to get the DerivedTypeSpec from a
DeclTypeSpec when it has one.

Original-commit: flang-compiler/f18@3bd921d8f365e9fb1422aec96d02b9ec333c4d68
Reviewed-on: https://github.com/flang-compiler/f18/pull/247

[flang] Treat CHARACTER like other intrinsic types with default kind

Character decl-type-specs with no kind specified had no kind written to
the .mod file. That was different from the other intrinsic types which
always have an explicit type. This change make character like the other
intrinsic types.

Original-commit: flang-compiler/f18@5b4f047a13c76e56579c1f06dbdf7b74358f16aa
Reviewed-on: https://github.com/flang-compiler/f18/pull/247
Tree-same-pre-rewrite: false