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* [gcc/devel/rust/master] Allow cast of integers to pointers
@ 2022-06-08 12:46 Thomas Schwinge
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From: Thomas Schwinge @ 2022-06-08 12:46 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:2e65c14bef940fa2f7dff4f407178af21488b76e
commit 2e65c14bef940fa2f7dff4f407178af21488b76e
Author: Philip Herron <philip.herron@embecosm.com>
Date: Tue May 10 17:51:05 2022 +0100
Allow cast of integers to pointers
This adds the cast rules of integer types and integer inference variables
to pointers. The code-generation needed to remove the bad assertion that
all integer literals were always going to be of type integer. This also
needed a tweak to a bad port from the cp/constexpr.cc code which assumed
that all integer_cst of pointer types would be a zero pointer which was
used to detect cases of bad method pointers in CPP which we does not apply
here.
see gcc/cp/constexpr.cc:6564-6488
Fixes #1226
Diff:
---
gcc/rust/backend/rust-compile-expr.cc | 1 -
gcc/rust/backend/rust-constexpr.cc | 12 +-----------
gcc/rust/typecheck/rust-tyty-cast.h | 11 +++++++++--
gcc/testsuite/rust/compile/issue-1226.rs | 6 ++++++
4 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/gcc/rust/backend/rust-compile-expr.cc b/gcc/rust/backend/rust-compile-expr.cc
index 1cf4e3d5499..0307df10f1f 100644
--- a/gcc/rust/backend/rust-compile-expr.cc
+++ b/gcc/rust/backend/rust-compile-expr.cc
@@ -903,7 +903,6 @@ CompileExpr::compile_integer_literal (const HIR::LiteralExpr &expr,
const auto literal_value = expr.get_literal ();
tree type = TyTyResolveCompile::compile (ctx, tyty);
- rust_assert (TREE_CODE (type) == INTEGER_TYPE);
mpz_t ival;
if (mpz_init_set_str (ival, literal_value.as_string ().c_str (), 10) != 0)
diff --git a/gcc/rust/backend/rust-constexpr.cc b/gcc/rust/backend/rust-constexpr.cc
index 1b0515e959c..aee41e43c0a 100644
--- a/gcc/rust/backend/rust-constexpr.cc
+++ b/gcc/rust/backend/rust-constexpr.cc
@@ -59,17 +59,7 @@ ConstCtx::constexpr_expression (tree t)
{
if (TREE_OVERFLOW (t))
{
- rust_error_at (Location (loc), "overflow in constant expression");
- return t;
- }
-
- if (TREE_CODE (t) == INTEGER_CST && TYPE_PTR_P (TREE_TYPE (t))
- && !integer_zerop (t))
- {
- // FIXME check does this actually work to print out tree types
- rust_error_at (Location (loc),
- "value %qE of type %qT is not a constant expression",
- t, TREE_TYPE (t));
+ error_at (loc, "overflow in constant expression");
return t;
}
diff --git a/gcc/rust/typecheck/rust-tyty-cast.h b/gcc/rust/typecheck/rust-tyty-cast.h
index 0e0e7b0a65b..5ca68d07aa2 100644
--- a/gcc/rust/typecheck/rust-tyty-cast.h
+++ b/gcc/rust/typecheck/rust-tyty-cast.h
@@ -588,8 +588,11 @@ public:
void visit (PointerType &type) override
{
- bool is_valid
- = (base->get_infer_kind () == TyTy::InferType::InferTypeKind::GENERAL);
+ bool is_general_infer_var
+ = base->get_infer_kind () == TyTy::InferType::InferTypeKind::GENERAL;
+ bool is_integral_infer_var
+ = base->get_infer_kind () == TyTy::InferType::InferTypeKind::INTEGRAL;
+ bool is_valid = is_general_infer_var || is_integral_infer_var;
if (is_valid)
{
resolved = type.clone ();
@@ -939,6 +942,8 @@ public:
void visit (ISizeType &type) override { resolved = type.clone (); }
+ void visit (PointerType &type) override { resolved = type.clone (); }
+
private:
BaseType *get_base () override { return base; }
@@ -975,6 +980,8 @@ public:
void visit (ISizeType &type) override { resolved = type.clone (); }
+ void visit (PointerType &type) override { resolved = type.clone (); }
+
void visit (CharType &type) override
{
// error[E0604]: only `u8` can be cast as `char`, not `i32`
diff --git a/gcc/testsuite/rust/compile/issue-1226.rs b/gcc/testsuite/rust/compile/issue-1226.rs
new file mode 100644
index 00000000000..f5f9e5ff08d
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-1226.rs
@@ -0,0 +1,6 @@
+// { dg-additional-options "-w" }
+const TEST: *mut u8 = 123 as *mut u8;
+
+fn test() {
+ let a = TEST;
+}
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