Setting up interfaces for codegen

gcc/rust/ChangeLog:

	* backend/rust-compile-expr.cc (CompileExpr::visit):
	Setting up interfaces for codegen
	* hir/tree/rust-hir-expr.h: Likewise.

gcc/rust/backend/rust-compile-expr.cc

@@ -321,8 +321,10 @@ CompileExpr::visit (HIR::IfExpr &expr)
 void
 CompileExpr::visit (HIR::InlineAsm &expr)
 {
-  tree test_string = build_string(expr.template_strs[0].symbol.size() + 1, expr.template_strs[0].symbol.c_str());
-  debug(test_string);
+  // translated = build_asm_expr()(expr.get_locus(),
+  //      expr.construct_string_tree(), expr.construct_outputs(),
+  //      expr.construct_inputs(),   expr.construct_clobber_tree(),
+  //      expr.construct_label_tree(), expr.is_simple(), expr.is_inline_asm());
 }
 
 void

gcc/rust/hir/tree/rust-hir-expr.h

@@ -25,6 +25,7 @@
 #include "rust-hir-path.h"
 #include "rust-operators.h"
 #include "rust-expr.h"
+#include "tree.h"
 namespace Rust {
 namespace HIR {
 
@@ -3928,8 +3929,33 @@ class InlineAsm : public ExprWithoutBlock
 
   {}
 
+  tree construct_string_tree ()
+  {
+    if (template_strs.empty ())
+      return build_string (1, "");
+    // Initialize to NULL_TREE
+    tree string_chain = NULL_TREE;
+
+    for (const auto &template_str : template_strs)
+      {
+	auto str = template_str.symbol;
+	auto string_tree = build_string (str.size () + 1, str.c_str ());
+
+	string_chain = tree_cons (NULL_TREE, string_tree, string_chain);
+      }
+    // Reverse the chain before returning
+    return nreverse (string_chain);
+  }
+
+  tree construct_clobber_tree () { return NULL_TREE; }
+  tree construct_label_tree () { return NULL_TREE; }
+  tree construct_inputs () { return NULL_TREE; }
+  tree construct_outputs () { return NULL_TREE; }
   // This function checks if the assembly macro is "simple" or not, according to
   // the tree defition (tree.h) of the
+
+  // SIMPLE indicates whether there was anything at all after the
+  // string in the asm expression
   bool is_simple ()
   {
     return operands.size () == 0 && clobber_abi.size () == 0