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* [gcc/devel/rust/master] Merge #1280
@ 2022-06-08 12:50 Thomas Schwinge
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From: Thomas Schwinge @ 2022-06-08 12:50 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:a4455d8f522cad015f3540f118f8c6ce2775fccb
commit a4455d8f522cad015f3540f118f8c6ce2775fccb
Merge: 5c84a5ca514 4cfd6942c07
Author: bors[bot] <26634292+bors[bot]@users.noreply.github.com>
Date: Thu May 26 08:55:57 2022 +0000
Merge #1280
1280: Str's have the same layout as [T] r=philberty a=philberty
Raw strings have a very specific type layout which maps over to Slices. It
also has very specific type checking rules so for example:
let a:&str = "TEST 1";
let b:&str = &"TEST 2";
Are both the same type this is likely to be for all DST's but lets do one
rule at a time.
Fixes #1023 #1271
Co-authored-by: Philip Herron <philip.herron@embecosm.com>
Diff:
gcc/rust/backend/rust-compile-expr.cc | 19 +++-
gcc/rust/backend/rust-compile-type.cc | 54 ++++++++++-
gcc/rust/backend/rust-compile-type.h | 1 +
gcc/rust/backend/rust-compile.cc | 31 +++---
gcc/rust/typecheck/rust-hir-type-check-expr.h | 20 ++++
gcc/rust/typecheck/rust-tycheck-dump.h | 8 ++
gcc/rust/typecheck/rust-tyty.h | 112 ++++++++++++++--------
gcc/testsuite/rust/compile/issue-1023.rs | 4 +
gcc/testsuite/rust/compile/issue-1271.rs | 5 +
gcc/testsuite/rust/compile/xfail/slice1.rs | 5 -
gcc/testsuite/rust/execute/torture/str-layout1.rs | 56 +++++++++++
11 files changed, 249 insertions(+), 66 deletions(-)
diff --cc gcc/rust/typecheck/rust-hir-type-check-expr.h
index 9dcae0871ca,d895ce43d37..8427cc9afc4
--- a/gcc/rust/typecheck/rust-hir-type-check-expr.h
+++ b/gcc/rust/typecheck/rust-hir-type-check-expr.h
@@@ -923,8 -972,28 +923,28 @@@ public
void visit (HIR::BorrowExpr &expr) override
{
TyTy::BaseType *resolved_base
- = TypeCheckExpr::Resolve (expr.get_expr ().get (), false);
+ = TypeCheckExpr::Resolve (expr.get_expr ().get ());
+ // In Rust this is valid because of DST's
+ //
+ // fn test() {
+ // let a:&str = "TEST 1";
+ // let b:&str = &"TEST 2";
+ // }
+ if (resolved_base->get_kind () == TyTy::TypeKind::REF)
+ {
+ const TyTy::ReferenceType *ref
+ = static_cast<const TyTy::ReferenceType *> (resolved_base);
+
+ // this might end up being a more generic is_dyn object check but lets
+ // double check dyn traits type-layout first
+ if (ref->is_dyn_str_type ())
+ {
+ infered = resolved_base;
+ return;
+ }
+ }
+
if (expr.get_is_double_borrow ())
{
// FIXME double_reference
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2022-06-08 12:50 [gcc/devel/rust/master] Merge #1280 Thomas Schwinge
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