[PATCH, PR d/91238] Committed fix for ICE in add_expr, at tree.c:7794

[Iain Buclaw]

Hi,

This patch fixes an ICE in the D compiler, where certain kinds of
lowered code mean the address of a CALL_EXPR is required.  When that
happens, use a TARGET_EXPR to hold the result, and take the address of
that instead.

Bootstrapped and regression tested on x86_64-linux-gnu.

Committed to trunk as r274253.

-- 
Iain
---
gcc/d/ChangeLog:

    PR d/91238
    * d-codegen.cc (build_address): If taking the address of a CALL_EXPR,
    wrap it in a TARGET_EXPR.

gcc/testsuite/ChangeLog:

    PR d/91238
    * gdc.dg/pr91238.d: New test.
---

diff --git a/gcc/d/d-codegen.cc b/gcc/d/d-codegen.cc
index 1971064e334..cf50693b2f5 100644
--- a/gcc/d/d-codegen.cc
+++ b/gcc/d/d-codegen.cc
@@ -651,9 +651,11 @@ build_address (tree exp)
   if (TREE_CODE (exp) == CONST_DECL)
     exp = DECL_INITIAL (exp);
 
-  /* Some expression lowering may request an address of a compile-time constant.
-     Make sure it is assigned to a location we can reference.  */
-  if (CONSTANT_CLASS_P (exp) && TREE_CODE (exp) != STRING_CST)
+  /* Some expression lowering may request an address of a compile-time constant,
+     or other non-lvalue expression.  Make sure it is assigned to a location we
+     can reference.  */
+  if ((CONSTANT_CLASS_P (exp) && TREE_CODE (exp) != STRING_CST)
+      || TREE_CODE (exp) == CALL_EXPR)
     exp = force_target_expr (exp);
 
   d_mark_addressable (exp);
diff --git a/gcc/testsuite/gdc.dg/pr91238.d b/gcc/testsuite/gdc.dg/pr91238.d
new file mode 100644
index 00000000000..26efb906212
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/pr91238.d
@@ -0,0 +1,18 @@
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91238
+// { dg-do compile }
+
+alias T = const(char)*;
+
+T name()
+{
+    return "";
+}
+
+void collect(ref T)
+{
+}
+
+void configure(T[T] targets)
+{
+    collect(targets[name]);
+}