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* [gcc/devel/rust/master] Allow references to arrays for ArrayIndexExpr accessor's
@ 2022-06-08 11:54 Thomas Schwinge
0 siblings, 0 replies; only message in thread
From: Thomas Schwinge @ 2022-06-08 11:54 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:e7e65bbdf3a06a7d00ed7da4ff8ebb16031ed6c3
commit e7e65bbdf3a06a7d00ed7da4ff8ebb16031ed6c3
Author: Philip Herron <philip.herron@embecosm.com>
Date: Wed Nov 24 16:31:49 2021 +0000
Allow references to arrays for ArrayIndexExpr accessor's
When we have an array-index expr rust allows the array reference to be a
reference and the compiler is meant to add in the required implicit
indirection. This checks for this senario and injects the indirection
during code-generation.
Fixes #815
Diff:
---
gcc/rust/backend/rust-compile-expr.h | 26 ++++++++++++++++++++--
gcc/rust/typecheck/rust-hir-type-check-expr.h | 32 +++++++++++++++------------
gcc/testsuite/rust/compile/array3.rs | 5 +++++
3 files changed, 47 insertions(+), 16 deletions(-)
diff --git a/gcc/rust/backend/rust-compile-expr.h b/gcc/rust/backend/rust-compile-expr.h
index 2bf969beef9..46d501a5859 100644
--- a/gcc/rust/backend/rust-compile-expr.h
+++ b/gcc/rust/backend/rust-compile-expr.h
@@ -390,10 +390,32 @@ public:
void visit (HIR::ArrayIndexExpr &expr) override
{
- tree array = CompileExpr::Compile (expr.get_array_expr (), ctx);
+ tree array_reference = CompileExpr::Compile (expr.get_array_expr (), ctx);
tree index = CompileExpr::Compile (expr.get_index_expr (), ctx);
+
+ // lets check if the array is a reference type then we can add an
+ // indirection if required
+ TyTy::BaseType *array_expr_ty = nullptr;
+ bool ok = ctx->get_tyctx ()->lookup_type (
+ expr.get_array_expr ()->get_mappings ().get_hirid (), &array_expr_ty);
+ rust_assert (ok);
+
+ // do we need to add an indirect reference
+ if (array_expr_ty->get_kind () == TyTy::TypeKind::REF)
+ {
+ TyTy::ReferenceType *r
+ = static_cast<TyTy::ReferenceType *> (array_expr_ty);
+ TyTy::BaseType *tuple_type = r->get_base ();
+ tree array_tyty = TyTyResolveCompile::compile (ctx, tuple_type);
+
+ array_reference
+ = ctx->get_backend ()->indirect_expression (array_tyty,
+ array_reference, true,
+ expr.get_locus ());
+ }
+
translated
- = ctx->get_backend ()->array_index_expression (array, index,
+ = ctx->get_backend ()->array_index_expression (array_reference, index,
expr.get_locus ());
}
diff --git a/gcc/rust/typecheck/rust-hir-type-check-expr.h b/gcc/rust/typecheck/rust-hir-type-check-expr.h
index fb1cd972293..8c34b6c776a 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-expr.h
+++ b/gcc/rust/typecheck/rust-hir-type-check-expr.h
@@ -929,24 +929,27 @@ public:
auto resolved_index_expr
= size_ty->unify (TypeCheckExpr::Resolve (expr.get_index_expr (), false));
- if (resolved_index_expr == nullptr)
+ if (resolved_index_expr->get_kind () != TyTy::TypeKind::ERROR)
{
- rust_error_at (expr.get_index_expr ()->get_locus (),
- "Type Resolver failure in Index for ArrayIndexExpr");
- return;
+ // allow the index expr to fail lets just continue on
+ context->insert_type (expr.get_index_expr ()->get_mappings (),
+ resolved_index_expr);
}
- context->insert_type (expr.get_index_expr ()->get_mappings (),
- resolved_index_expr);
- // resolve the array reference
- expr.get_array_expr ()->accept_vis (*this);
- if (infered == nullptr)
+ auto array_expr_ty
+ = TypeCheckExpr::Resolve (expr.get_array_expr (), inside_loop);
+ if (array_expr_ty->get_kind () == TyTy::TypeKind::ERROR)
+ return;
+ else if (array_expr_ty->get_kind () == TyTy::TypeKind::REF)
{
- rust_error_at (expr.get_index_expr ()->get_locus (),
- "failed to resolve array reference expression");
- return;
+ // lets try and deref it since rust allows this
+ auto ref = static_cast<TyTy::ReferenceType *> (array_expr_ty);
+ auto base = ref->get_base ();
+ if (base->get_kind () == TyTy::TypeKind::ARRAY)
+ array_expr_ty = base;
}
- else if (infered->get_kind () != TyTy::TypeKind::ARRAY)
+
+ if (array_expr_ty->get_kind () != TyTy::TypeKind::ARRAY)
{
rust_error_at (expr.get_index_expr ()->get_locus (),
"expected an ArrayType got [%s]",
@@ -955,7 +958,8 @@ public:
return;
}
- TyTy::ArrayType *array_type = static_cast<TyTy::ArrayType *> (infered);
+ TyTy::ArrayType *array_type
+ = static_cast<TyTy::ArrayType *> (array_expr_ty);
infered = array_type->get_element_type ()->clone ();
}
diff --git a/gcc/testsuite/rust/compile/array3.rs b/gcc/testsuite/rust/compile/array3.rs
new file mode 100644
index 00000000000..a62c6ca69c7
--- /dev/null
+++ b/gcc/testsuite/rust/compile/array3.rs
@@ -0,0 +1,5 @@
+fn foo(state: &mut [u32; 16], a: usize) {
+ // { dg-warning "function is never used: .foo." "" { target *-*-* } .-1 }
+ // { dg-warning "unused name .foo." "" { target *-*-* } .-2 }
+ state[a] = 1;
+}
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