[flang] Allow $ and @ in defined operator names.

Original-commit: flang-compiler/f18@3cf7533a3bfe35b5dcb4396f35339ee34d34c272
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#79 from ThePortlandGroup/tsk3

Implement USE statements.

Original-commit: flang-compiler/f18@053461f6de9f4d0c86cc96543915adabf1d16df3
Reviewed-on: https://github.com/flang-compiler/f18/pull/79

[flang] Support for USE statements.

When a USE statement is encountered, find the scope corresponding to the
module. This is now stored in the ModuleDetails of the module symbol.
useModuleScope_ tracks this while processing the USE. Currently only
modules defined in the same file work because we don't have module files.

At the end of a USE that isn't a use-only, add all public names that
were not renamed.

AddUse() handles recording of a USE by creating a local symbol with
UseDetails that tracks the use-symbol in the module and the location of
the USE (for error messages). If an ambiguous USE is detected, the
UseDetails are replaced by UseErrorDetails. This tracks the locations of
all the uses so that they can be referenced in a diagnostic.

Detect attempts to re-declare use-associated symbols as well as changing
their attributes (except for ASYNCHRONOUS and VOLATILE).

Add missing checks for access-stmt in scoping units other than modules.

Add tests for the new errors.

Reorganize the MessageHandler::Say() overloadings to prevent them from
becoming too numerous.

Original-commit: flang-compiler/f18@cc0523134c85ee2fe156b4f5c8d042e73ac92549
Reviewed-on: https://github.com/flang-compiler/f18/pull/79

[flang] resolve-names.cc reorganization and cleanup.

Add ScopeHandle class to manage the stack of scopes and MakeSymbol(), which
makes a symbol in the current scope. Move the call to ApplyImplicitScopes()
into PopScope() as it must be done for each scope.

Add ModuleVisitor class to manage module-related resolution. Currently that
consists of beginning and ending modules and access statements. This is
preparation for further module work.

Replace references to parser::CharBlock with SourceName.

Original-commit: flang-compiler/f18@913df85e48f1e06d0c75bb517f5edd898e8efd69
Reviewed-on: https://github.com/flang-compiler/f18/pull/79
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#78 from ThePortlandGroup/sch_llvm2

Add dependency to LLVM & Clang libraries (backport)

Original-commit: flang-compiler/f18@c0d84e4ae39efd6a2fd971f81008c7d4d74c6b80
Reviewed-on: https://github.com/flang-compiler/f18/pull/78

[flang] misc changes in response to pul-request comments

Original-commit: flang-compiler/f18@1b3332d2adc094a318415609e9ba7e881bf5074a
Reviewed-on: https://github.com/flang-compiler/f18/pull/78

[flang] fix typo in comment

Original-commit: flang-compiler/f18@477e852903089cecb7f6049539bdb5f5a8d633b1
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Add missing underscore to private members

Original-commit: flang-compiler/f18@7247cf4c3a3a7a83be923956cbb10c123a9430e0
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Fix duplicate copyright message

Original-commit: flang-compiler/f18@65e3e864402f3771f618868a2d18ee1d182847f0
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Manual backport of sch_llvm branch

Original-commit: flang-compiler/f18@17ee2d8e3ac5bfb633cc2792ee7873c543696e72
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#77 from ThePortlandGroup/tsk4

Source code cleanup

Original-commit: flang-compiler/f18@63b5a0e133ce259d7a1690237ae2534f5c803505
Reviewed-on: https://github.com/flang-compiler/f18/pull/77

[flang] Run clang-format on all .h and .cc files.

Original-commit: flang-compiler/f18@b7f02808a244fbb2597dc2bdc4430b292b433c03
Reviewed-on: https://github.com/flang-compiler/f18/pull/77

[flang] Normalize namespace definitions.

Replace `namespace Fortran { namespace parser { ... } }` with
`namespace Fortran::parser { ... }` and similarly for semantics.

Original-commit: flang-compiler/f18@838c9539b2497f8dd1e33bd23623a5373a694e7b
Reviewed-on: https://github.com/flang-compiler/f18/pull/77
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#76 from ThePortlandGroup/sjs-os1

Remove unused code; rename dump-parse-tree

Original-commit: flang-compiler/f18@e46b5087b7b18e5d65165ff134de50683451aed6
Reviewed-on: https://github.com/flang-compiler/f18/pull/76

[flang] Update CMakefiles and #include paths.

Original-commit: flang-compiler/f18@1b7b8259b39760446f9aaee8b104cc1a8543f5dd
Reviewed-on: https://github.com/flang-compiler/f18/pull/76

[flang] Removed unused files and declarations.
Renamed ParseTreeDump to dump-parse-tree.

Original-commit: flang-compiler/f18@9de97328f1f477441863246c7c1bd8ff4f32498b
Reviewed-on: https://github.com/flang-compiler/f18/pull/76
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#75 from ThePortlandGroup/tsk4

Cleanup

Original-commit: flang-compiler/f18@d1545693d1ed4716603a6526f2f60f604a48be74
Reviewed-on: https://github.com/flang-compiler/f18/pull/75

[flang] Make include guards consistent.

The include guard symbol is `FORTRAN_$dir_$file_H_` where $dir is the
subdirectory of `lib` and $file is the basename of the header file.
Those names are mapped to uppercase and hyphens are replaced by
underscores.

Original-commit: flang-compiler/f18@ac9c0e7106c898479cf35086861a711ab7c0210a
Reviewed-on: https://github.com/flang-compiler/f18/pull/75

[flang] Remove unused files.

Original-commit: flang-compiler/f18@856315fd43308d49c61bb2a0f10c77e01b32fdbc
Reviewed-on: https://github.com/flang-compiler/f18/pull/75
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#74 from ThePortlandGroup/tsk4

Add copyright notices.

Original-commit: flang-compiler/f18@20f64da9d97cec06f422ff9ed7420fcebd78472f
Reviewed-on: https://github.com/flang-compiler/f18/pull/74

[flang] Add copyright notices.

For source files (C++, Fortran, CMake) add copyright and license.
For documentation files add just copyright.

Original-commit: flang-compiler/f18@38381aed839ef091a44ea8f2ef7bc5346d776c67
Reviewed-on: https://github.com/flang-compiler/f18/pull/74

[flang] Merge pull request flang-compiler/f18#73 from ThePortlandGroup/pmk-scrub3

More clean-up & build with Clang

Original-commit: flang-compiler/f18@c809062f1176338223e897f32139ffe3d86d5eae
Reviewed-on: https://github.com/flang-compiler/f18/pull/73

[flang] Clean out the PGI stuff from CMakeLists.txt.

Original-commit: flang-compiler/f18@806db179ce8f9437f301772712baf69b8f0e4135
Reviewed-on: https://github.com/flang-compiler/f18/pull/73

[flang] Fix a static_assert and a message location bug in first().

Original-commit: flang-compiler/f18@cd85bff31b1a93bfd7f9ad8344982f88670e3365
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] silence a warning

Original-commit: flang-compiler/f18@dc91727ac4d81a6257c0011b75d4311e2751f941
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] More Clang work.

Original-commit: flang-compiler/f18@7ff98ad77848c314a5d7ed5559087610bae4b805
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Use libc++ with clang.

Original-commit: flang-compiler/f18@d81b8d87f8712bc478931637f124c5a6a22d928b
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Use first() to define operator|| when compiling with clang.

Original-commit: flang-compiler/f18@7bf98d683c46b29f6bed4a00dfd0eceebc9dcea7
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Remove excess space at end of line.

Original-commit: flang-compiler/f18@900dc4e254ea680f33382e35eab1fd5b1321ea09
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Refine CMakeLists.txt tweaks.

Original-commit: flang-compiler/f18@b40c68f9ab8fda8b8110159b6f6e9faf530aeedc
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Package clang build settings.

Original-commit: flang-compiler/f18@775b42598d278e58277e7f730b8f51d9657db2e4
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Patches to permit building with Clang without notes or warnings.

Original-commit: flang-compiler/f18@0e74b10603ecceaca1781ecd0ee630de89e8e7f1
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Use first() more.

Original-commit: flang-compiler/f18@a2f2fdf869bd9a73a3b900d599f7adca2b02a8cd
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Implement first(...) as attempt at a faster set of alternatives.

Original-commit: flang-compiler/f18@9f6a26cee636c3cc91d91583fd2b785f26a618c2
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Attempt to build f18 with clang.

Original-commit: flang-compiler/f18@0480837234cfe407aac0795cc5c35dfa6ee1139d
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Attempt to build f18 with clang.

Original-commit: flang-compiler/f18@86fec97e418d5e4156dac8a8ea84764c81e6a12a
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Resolve an old TODO by flattening a std::optional<std::optional<>>.

Original-commit: flang-compiler/f18@05f47831fc2d6ce7a59993ac8670db8e85b89706
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Resolve old TODO about needless Indirection<>.

Original-commit: flang-compiler/f18@5f289209c4ec76be905dd76d649a725af3998e8d
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#70 from ThePortlandGroup/tsk2

Initial support for name resolution in modules.

Original-commit: flang-compiler/f18@1c318fe9f759eb1cdbe29d6a8869f675c4f9fb7c
Reviewed-on: https://github.com/flang-compiler/f18/pull/70

[flang] Improve comment.

Original-commit: flang-compiler/f18@270514a30b593db23d6526ac940cd31471f4992b
Reviewed-on: https://github.com/flang-compiler/f18/pull/70

[flang] Remove unnecessary defaults in switches.

Original-commit: flang-compiler/f18@f4835e3831f875fb3ae56f390201ab34422c64e3
Reviewed-on: https://github.com/flang-compiler/f18/pull/70
Tree-same-pre-rewrite: false

[flang] Non-fatal error for repeated access spec

When an access statement repeats the same attribute, make it a non-fatal
diagnostic. Also, include the previous specification in the message.

resolve11.f90 now illustrates both cases, fatal and non-fatal.

Original-commit: flang-compiler/f18@1f567c740a8ec300d247f63a69b15ca820e757a3
Reviewed-on: https://github.com/flang-compiler/f18/pull/70
Tree-same-pre-rewrite: false

[flang] Initial support for name resolution in modules.

Recognize modules and open and close the corresponding scope.
Handle PUBLIC and PRIVATE statements and set the corresponding
attributes on entity declarations in the module.

Refactoring (no functional changes): Make CheckImplicitSymbol() and
GetVariableName() overloadings private and out-of-line.

Add missing option to f18 help.

Original-commit: flang-compiler/f18@d01cacca6335629b8c82205a45d4347754dada5f
Reviewed-on: https://github.com/flang-compiler/f18/pull/70
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#69 from ThePortlandGroup/pmk3

Make `construct<T>(...)` calls span more accurate source ranges.

Original-commit: flang-compiler/f18@e332daec7af2752624f89eeef6f20b60930cb66f
Reviewed-on: https://github.com/flang-compiler/f18/pull/69

[flang] Remove dead code, reformat.

Original-commit: flang-compiler/f18@c87fdd8cd94667c8dd56ef0b9d588013c9a0994a
Reviewed-on: https://github.com/flang-compiler/f18/pull/69

[flang] Reformat.

Original-commit: flang-compiler/f18@047de95439fd5f2988c3afd743472704dc9745af
Reviewed-on: https://github.com/flang-compiler/f18/pull/69
Tree-same-pre-rewrite: false

[flang] Allow construct<T>("TOKEN"_tok)" with unvalued parser argument.

Original-commit: flang-compiler/f18@19d2a4a849fcc14aa02083a2ade0211a15784526
Reviewed-on: https://github.com/flang-compiler/f18/pull/69
Tree-same-pre-rewrite: false

[flang] Add constructIf<>(); complete pass over grammar.

Original-commit: flang-compiler/f18@4d5b4055bd083b1df7ae2e5456cf52be1109d0a4
Reviewed-on: https://github.com/flang-compiler/f18/pull/69
Tree-same-pre-rewrite: false

[flang] Adjust productions in grammar.h so that construct<> invocations span what they cover (more to come)

Original-commit: flang-compiler/f18@ba5c2368d1c8b40d36746d16a2ee848ecfc5152c
Reviewed-on: https://github.com/flang-compiler/f18/pull/69
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#67 from ThePortlandGroup/tsk3

Create Message instances with provenance range.

Original-commit: flang-compiler/f18@6e473cd0293596a50279b84891a8fc63d4509ff1
Reviewed-on: https://github.com/flang-compiler/f18/pull/67

[flang] Create Message instances with provenance range.

This allows the message to point to the full name or statement
rather than just the first character.

Original-commit: flang-compiler/f18@9cf41b13358f45e03338789b968113c347acd895
Reviewed-on: https://github.com/flang-compiler/f18/pull/67

[flang] Merge pull request flang-compiler/f18#68 from ThePortlandGroup/pmk-scrub2

Remove needless empty braces from construct<>() calls.

Original-commit: flang-compiler/f18@d7609befe6ab89f57b1c9e9a7602275d26dcab0c
Reviewed-on: https://github.com/flang-compiler/f18/pull/68

[flang] Remove needless empty braces from construct<>() calls.

Original-commit: flang-compiler/f18@f9c4a27034f52468eaee2397580685effa26e759
Reviewed-on: https://github.com/flang-compiler/f18/pull/68

[flang] Merge pull request flang-compiler/f18#66 from ThePortlandGroup/pmk-scrub

Code clean-up & provenance ranges on messages

Original-commit: flang-compiler/f18@fd50389e44713f3b9bd3d530c7a2154ce2712f2e
Reviewed-on: https://github.com/flang-compiler/f18/pull/66

[flang] Delete more dead code.

Original-commit: flang-compiler/f18@e38e411ccfeff06b8e27c219ad0e520ea07335a5
Reviewed-on: https://github.com/flang-compiler/f18/pull/66

[flang] Remove dead code.

Original-commit: flang-compiler/f18@a85e16c704422f42c0811c51bd4e668b407d11c6
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Use ranges of provenances in messages.

Original-commit: flang-compiler/f18@67d4f878a4392689ba1f768a69198de93af871c2
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Extend Message representation to cover ranges.

Original-commit: flang-compiler/f18@314819c87f3f21fff715fd9c78b36f8a8bc77d6b
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Finish cleaning up debug-parser.

Original-commit: flang-compiler/f18@0ef551025ac7cf192e47fad1139ae3381a874b91
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Split debug-parser.h, put code into debug-parser.cc.

Original-commit: flang-compiler/f18@b34d15ef6d67e71a0ba6f64e419d2519681e7cbc
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Finish moving user state action parsers into user-state.{h,cc}.

Original-commit: flang-compiler/f18@79c8a4cefe566bd64692acc8bc13e0a25c4f6be4
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] More clean-up.

Original-commit: flang-compiler/f18@96dda922867e50f6f33a4ebe4d0fbc8e25141c5b
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Begin moving UserState action parsers into user-state.{h,cc}.

Original-commit: flang-compiler/f18@5c31402146bf24873b37fdb4fa83dbe6256f30c3
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Fix header file name.

Original-commit: flang-compiler/f18@8abfeaed450fd6dafc34eb3db137246c0e339bed
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Move Parser<> to its own header.

Original-commit: flang-compiler/f18@c43e8ba138546c5739cc8eaa681a9eb6e51ed657
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Use references for ParseState arguments to parsers.  Other minor clean-up.

Original-commit: flang-compiler/f18@5b18b799e795199eece6c95485f59d552b438596
Reviewed-on: https://github.com/flang-compiler/f18/pull/66
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#65 from ThePortlandGroup/tsk2

Rewrite function calls to array element references

Original-commit: flang-compiler/f18@1dc8d272506f08e9a8845643a0bf9c923cc4eb99
Reviewed-on: https://github.com/flang-compiler/f18/pull/65

[flang] Undo previous commit.

`name` depends on the template type, so we have to explicitly say
that `has` is a template with the `template` keyword.
Rather than do that I'm putting back the explicit type for name.

Original-commit: flang-compiler/f18@0cde87f2fe64801dbbd2172970e3d0113d421006
Reviewed-on: https://github.com/flang-compiler/f18/pull/65

[flang] Address review comment.

Original-commit: flang-compiler/f18@cb3904761b33644b68d679429462e4283c671b36
Reviewed-on: https://github.com/flang-compiler/f18/pull/65
Tree-same-pre-rewrite: false

[flang] Rewrite function calls to array element references

parse-tree.h, parse-tree.cc:
Add FunctionReference::ConvertToArrayElementRef() to convert a function
reference to an array element reference.
Factor out MakeArrayElementRef() to use in ConvertToArrayElementRef()
and also in converting statement functions to array element assignments.

resolve-names.cc:
Recognize references to functions and subroutines and add symbols for them.
Detect declaration conflicts from these and check `IMPLICIT NONE(EXTERNAL)`.

rewrite-parse-tree.cc:
Find function references that need to be converted and rewrite them.

Original-commit: flang-compiler/f18@e5a1e0aaeffe8de92b1ecb67890ffa463cd6a43a
Reviewed-on: https://github.com/flang-compiler/f18/pull/65

[flang] Merge pull request flang-compiler/f18#62 from ThePortlandGroup/pmk-instr

Parser instrumentation and caching of failed parse attempts

Original-commit: flang-compiler/f18@30040ed22e9e8063e11e325e1afd9963773b53a3
Reviewed-on: https://github.com/flang-compiler/f18/pull/62

[flang] Complete parser instrumentation and caching of failures.

Original-commit: flang-compiler/f18@9843dbf211bf2a2859aaa5451223e7d090a229ea
Reviewed-on: https://github.com/flang-compiler/f18/pull/62

[flang] Parser instrumentation and fail-fast experiment begun.

Original-commit: flang-compiler/f18@ab46163d6e84aa4fdde0e3149d12fe1049f64f9f
Reviewed-on: https://github.com/flang-compiler/f18/pull/62
Tree-same-pre-rewrite: false

[flang] First cut at parser instrumentation with pass/fail counters.

Original-commit: flang-compiler/f18@21ed700afa6b7d7ec9ee5477d7d16a01ead42557
Reviewed-on: https://github.com/flang-compiler/f18/pull/62
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#61 from ThePortlandGroup/pmk-cset

Define SetOfChars type, use it

Original-commit: flang-compiler/f18@1d563ba59fa5d3eff4bc5b4796ca7e8525f064fb
Reviewed-on: https://github.com/flang-compiler/f18/pull/61

[flang] Address review comments.

Original-commit: flang-compiler/f18@dbeba373223f97e627063fed17b3f72e2b5c508e
Reviewed-on: https://github.com/flang-compiler/f18/pull/61

[flang] Finish repackaging SetOfChars

Original-commit: flang-compiler/f18@37085c0cddaf693ae21b79ac6bedd7e059c241d6
Reviewed-on: https://github.com/flang-compiler/f18/pull/61
Tree-same-pre-rewrite: false

[flang] More repackaging

Original-commit: flang-compiler/f18@55f4f0505e57b750c3da0dc3fc9e2bbd0c99d831
Reviewed-on: https://github.com/flang-compiler/f18/pull/61
Tree-same-pre-rewrite: false

[flang] repackage SetOfChars as a class type

Original-commit: flang-compiler/f18@bae9199f62bd37617db1823b93e6f4da4acfd563
Reviewed-on: https://github.com/flang-compiler/f18/pull/61
Tree-same-pre-rewrite: false

[flang] Combine expected character sets of messages ending at same point from two alternatives.

Original-commit: flang-compiler/f18@a006ceef1d2176112353605b3a9bf4391cbced9a
Reviewed-on: https://github.com/flang-compiler/f18/pull/61
Tree-same-pre-rewrite: false

[flang] debugging

Original-commit: flang-compiler/f18@02718dd6ef6dca6ba388917bb6a65a75e1ebeaeb
Reviewed-on: https://github.com/flang-compiler/f18/pull/61
Tree-same-pre-rewrite: false

[flang] Define sets of characters; use them in parsing and messages.

Original-commit: flang-compiler/f18@d3ca565b59e2cc4920629af2571a4a6b66cf3b9b
Reviewed-on: https://github.com/flang-compiler/f18/pull/61
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#60 from ThePortlandGroup/tsk2

Implement parse tree rewriting.

Original-commit: flang-compiler/f18@ac0c8ca08ec9cbf35ac2f51b9ee04bb2dce1f9b0
Reviewed-on: https://github.com/flang-compiler/f18/pull/60

[flang] Move ConvertToAssignment into class StmtFunctionStmt.

Original-commit: flang-compiler/f18@e3eaca38fd0c30765474c2a46ae4d6c36796af07
Reviewed-on: https://github.com/flang-compiler/f18/pull/60

[flang] Merge parse-tree-mutator.h into parse-tree-visitor.h

Use the latter for visiting and mutating and delete the former.

Original-commit: flang-compiler/f18@ac5a098ca7187eeb5d5bd2104c8d29363075b368
Reviewed-on: https://github.com/flang-compiler/f18/pull/60
Tree-same-pre-rewrite: false

[flang] Address review comments.

Original-commit: flang-compiler/f18@d3a363d6cbcb154201f45670c0a60edbff260719
Reviewed-on: https://github.com/flang-compiler/f18/pull/60
Tree-same-pre-rewrite: false

[flang] Implement parse tree rewriting.

Add parse-tree-mutator.h like parse-tree-visitor.h except that the Walk
functions take non-const references to parse tree nodes so the Pre and
Post methods of the mutator that are passed around can make changes to
the parse tree.

Change ExecutionPart to be a class that wraps a list so that it can be
identified during parse tree walking.

Add Symbol* field to parser::Name for the result of symbol resolution.
In parse tree dumper, dump symbol when it is there instead of just name.

Add RewriteParseTree to walk the parse tree, fill in resolved symbols in
Name nodes, and make necessary changes to the structure. Currently that
consists of rewriting statement functions as array assignments when
appropriate.

In ResolveNames, call RewriteParseTree if the resolution was successful.
Recognize a statement function that comes after a mis-identified
statement function and report an error. resolve08.f90 tests this case.

Add -fdebug-dump-symbols to dump the scope tree and symbols in each scope.
This is implemented by DumpSymbols in resolve-names.cc. Add an optional
symbol to scopes that correspond to symbols (e.g. subprograms). Remove
debug output from ResolveNamesVisitor as this option can be used instead.

Original-commit: flang-compiler/f18@9cd337226521c7f3d2b149983ed677def55baa29
Reviewed-on: https://github.com/flang-compiler/f18/pull/60
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#59 from ThePortlandGroup/pmk-messages

Messaging work

Original-commit: flang-compiler/f18@f6b879ab1070b940df3c97b0a1251ed0f73f8475
Reviewed-on: https://github.com/flang-compiler/f18/pull/59

[flang] Defer message accumulation until it is known that messages will be produced.

Original-commit: flang-compiler/f18@8485d44efd6a0b78b091b613d7c4d8eb95231533
Reviewed-on: https://github.com/flang-compiler/f18/pull/59

[flang] Suppress messages in lookAhead and negated parsers.

Original-commit: flang-compiler/f18@6c00f10364e97a9e131869120814f499faec8bd0
Reviewed-on: https://github.com/flang-compiler/f18/pull/59
Tree-same-pre-rewrite: false

[flang] reformat

Original-commit: flang-compiler/f18@4a4648facdf671b75cc2f63b13f7f382e4206039
Reviewed-on: https://github.com/flang-compiler/f18/pull/59
Tree-same-pre-rewrite: false

[flang] Remove questionable swap() routines in ParseState and Messages.

Original-commit: flang-compiler/f18@9a8155ebca1b3f0a7d345a7a832dcc765623f096
Reviewed-on: https://github.com/flang-compiler/f18/pull/59
Tree-same-pre-rewrite: false

[flang] Avoid a std::move() when emplacing new messages.

Original-commit: flang-compiler/f18@39c0e1fdba24283db4f45a23d643b3db36ac6b42
Reviewed-on: https://github.com/flang-compiler/f18/pull/59
Tree-same-pre-rewrite: false

[flang] Remove obsolete #if 0 code.

Original-commit: flang-compiler/f18@0195cd5646359ef8932fe3ef9f03ad9ed6866260
Reviewed-on: https://github.com/flang-compiler/f18/pull/59
Tree-same-pre-rewrite: false

[flang] Avoid std::shared_ptr<> in favor of reference counting.

Original-commit: flang-compiler/f18@116c9881c9d0c523c19a3201027b5c4974f6416e
Reviewed-on: https://github.com/flang-compiler/f18/pull/59
Tree-same-pre-rewrite: false

[flang] Message experiment: defer all message generation until non-speculative.

Original-commit: flang-compiler/f18@b6ce95ca3a6e21a7bfd89afbb522d8a78ebce6c2
Reviewed-on: https://github.com/flang-compiler/f18/pull/59
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#58 from ThePortlandGroup/tsk1

Add statement functions to symbol table

Original-commit: flang-compiler/f18@c69f975aeeb3b1617b8aa8509f72828b5fa4f955
Reviewed-on: https://github.com/flang-compiler/f18/pull/58

[flang] Address review comments.

Original-commit: flang-compiler/f18@f9a54f71712c7b8124591b5fcc27d2e2af9313a5
Reviewed-on: https://github.com/flang-compiler/f18/pull/58

[flang] Add statement functions to symbol table

SubprogramDetails: Store dummy args and result as symbols, not names.

Symbol: Save list of occurrences (i.e. SourceNames that map to the same
symbol). This is needed to map Names in the parse tree back to symbols,
and will probably be useful when reporting errors.
Improve dumping of symbols.

resolve-names.cc: Recognize statement functions. They are treated like
function subprograms but the result type and type of dummy arguments come
from the enclosing scope. The implicit rules from the enclosing scope need
to be copied in.

Original-commit: flang-compiler/f18@44e4fb4b6cc107fad299e80046673804c15a2ac2
Reviewed-on: https://github.com/flang-compiler/f18/pull/58
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#57 from ThePortlandGroup/pmk-bugfix

fix misrecogition of actual argument "a==b"

Original-commit: flang-compiler/f18@56ee8bf349fcd0749febd2e5ecff738394539f41
Reviewed-on: https://github.com/flang-compiler/f18/pull/57