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[Ada] Preserve unchecked conversion of string constant

Message ID 20220519141620.GA3723475@adacore.com
State New
Headers show
Series [Ada] Preserve unchecked conversion of string constant | expand

Commit Message

Pierre-Marie de Rodat May 19, 2022, 2:16 p.m. UTC 
This makes it possible to pass the result to a C function directly.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* gcc-interface/utils.cc (unchecked_convert): Do not fold a string
	constant if the target type is pointer to character.
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Patch

diff --git a/gcc/ada/gcc-interface/utils.cc b/gcc/ada/gcc-interface/utils.cc
--- a/gcc/ada/gcc-interface/utils.cc
+++ b/gcc/ada/gcc-interface/utils.cc
@@ -5637,6 +5637,13 @@  unchecked_convert (tree type, tree expr, bool notrunc_p)
       return unchecked_convert (type, expr, notrunc_p);
     }
 
+  /* If we are converting a string constant to a pointer to character, make
+     sure that the string is not folded into an integer constant.  */
+  else if (TREE_CODE (expr) == STRING_CST
+	   && POINTER_TYPE_P (type)
+	   && TYPE_STRING_FLAG (TREE_TYPE (type)))
+    expr = build1 (VIEW_CONVERT_EXPR, type, expr);
+
   /* Otherwise, just build a VIEW_CONVERT_EXPR of the expression.  */
   else
     {