[gcc/devel/rust/master] Merge #1607

[gcc/devel/rust/master] Merge #1607

[Thomas Schwinge]

https://gcc.gnu.org/g:60b21d2f58f46c93fc33f6192682abfed62d8dd9

commit 60b21d2f58f46c93fc33f6192682abfed62d8dd9
Merge: dfb5921b765 89490980726
Author: bors[bot] <26634292+bors[bot]@users.noreply.github.com>
Date:   Fri Oct 21 13:05:18 2022 +0000

    Merge #1607
    
    1607: Improve AST Fragment class r=CohenArthur a=CohenArthur
    
    This changes the APIs around creating AST fragments and refactors the class into its own header and source file, hopefully making it easier to use. This will also help creating "unexpanded" AST fragments for proper builtin macro expansion with the new fixed-point algorithm introduced by #1606
    
    `@liushuyu` pinging you since you've worked extensively with the macro system. Would love your review!
    
    Co-authored-by: Arthur Cohen <arthur.cohen@embecosm.com>

Diff:

 gcc/rust/Make-lang.in                    |   1 +
 gcc/rust/ast/rust-ast-fragment.cc        | 171 +++++++++++++++++++++++++++++++
 gcc/rust/ast/rust-ast-fragment.h         | 118 +++++++++++++++++++++
 gcc/rust/ast/rust-ast.h                  | 132 ------------------------
 gcc/rust/ast/rust-macro.h                |  18 ++--
 gcc/rust/expand/rust-attribute-visitor.h |   4 +-
 gcc/rust/expand/rust-macro-builtins.cc   |  72 ++++++-------
 gcc/rust/expand/rust-macro-builtins.h    |  40 ++++----
 gcc/rust/expand/rust-macro-expand.cc     |  42 ++++----
 gcc/rust/expand/rust-macro-expand.h      |  23 ++---
 gcc/rust/util/rust-hir-map.cc            |   4 +-
 11 files changed, 390 insertions(+), 235 deletions(-)