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[COMMITTED,12/23] Implement operator_addr_expr for prange.

Message ID 20240504083056.139719-13-aldyh@redhat.com
State New
Headers show
Series prange: pointer ranges | expand

Commit Message

Aldy Hernandez May 4, 2024, 8:30 a.m. UTC 
gcc/ChangeLog:

	* range-op-mixed.h: Add overloaded declarations for pointer variants.
	* range-op-ptr.cc (operator_addr_expr::op1_range): New.
	(operator_addr_expr::pointers_handled_p): New.
---
 gcc/range-op-mixed.h |  4 ++++
 gcc/range-op-ptr.cc  | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
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Patch

diff --git a/gcc/range-op-mixed.h b/gcc/range-op-mixed.h
index b69e674a78b..0df300781f1 100644
--- a/gcc/range-op-mixed.h
+++ b/gcc/range-op-mixed.h
@@ -655,6 +655,10 @@  public:
   bool op1_range (irange &r, tree type,
 		  const irange &lhs, const irange &op2,
 		  relation_trio rel = TRIO_VARYING) const final override;
+  bool op1_range (prange &r, tree type,
+		  const prange &lhs, const prange &op2,
+		  relation_trio rel = TRIO_VARYING) const final override;
+  bool pointers_handled_p (range_op_dispatch_type, unsigned) const final override;
 };
 
 class operator_bitwise_not : public range_operator
diff --git a/gcc/range-op-ptr.cc b/gcc/range-op-ptr.cc
index 0addd1096c2..38d9f65566f 100644
--- a/gcc/range-op-ptr.cc
+++ b/gcc/range-op-ptr.cc
@@ -1021,6 +1021,44 @@  operator_max::pointers_handled_p (range_op_dispatch_type type,
     }
 }
 
+bool
+operator_addr_expr::op1_range (prange &r, tree type,
+			       const prange &lhs,
+			       const prange &op2,
+			       relation_trio) const
+{
+  if (empty_range_varying (r, type, lhs, op2))
+    return true;
+
+  // Return a non-null pointer of the LHS type (passed in op2), but only
+  // if we cant overflow, eitherwise a no-zero offset could wrap to zero.
+  // See PR 111009.
+  if (!lhs.undefined_p ()
+      && !range_includes_zero_p (lhs)
+      && TYPE_OVERFLOW_UNDEFINED (type))
+    r.set_nonzero (type);
+  else
+    r.set_varying (type);
+  return true;
+}
+
+bool
+operator_addr_expr::pointers_handled_p (range_op_dispatch_type type,
+					unsigned dispatch) const
+{
+  switch (type)
+    {
+    case DISPATCH_FOLD_RANGE:
+      // NOTE: It looks like we never generate this combination.
+      gcc_unreachable ();
+      return false;
+    case DISPATCH_OP1_RANGE:
+      return dispatch == RO_PPP;
+    default:
+      return true;
+    }
+}
+
 // Initialize any pointer operators to the primary table
 
 void