1 files changed, 105 insertions, 0 deletions
diff --git a/libcc1/gdbctx.hh b/libcc1/gdbctx.hh
new file mode 100644
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--- /dev/null
+++ b/libcc1/gdbctx.hh
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+/* Generic GDB-side plugin
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef CC1_PLUGIN_GDBCTX_HH
+#define CC1_PLUGIN_GDBCTX_HH
+
+namespace cc1_plugin
+{
+  // The compiler context that we hand back to our caller.
+  template<typename T>
+  struct base_gdb_plugin : public T
+  {
+    explicit base_gdb_plugin (const gcc_base_vtable *v)
+      : verbose (false),
+	compilerp (new compiler (verbose))
+    {
+      this->base.ops = v;
+    }
+
+    // A convenience function to print something.
+    void print (const char *str)
+    {
+      this->print_function (this->print_datum, str);
+    }
+
+    // Set the verbose flag.
+    void set_verbose (bool v)
+    {
+      verbose = v;
+      if (compilerp != nullptr)
+	compilerp->set_verbose (v);
+    }
+
+    // Make a new connection.
+    void set_connection (int fd, int aux_fd)
+    {
+      connection.reset (new local_connection (fd, aux_fd, this));
+    }
+
+    // A local subclass of connection that holds a back-pointer to the
+    // context object that we provide to our caller.
+    class local_connection : public cc1_plugin::connection
+    {
+    public:
+
+      local_connection (int fd, int aux_fd, base_gdb_plugin<T> *b)
+	: connection (fd, aux_fd),
+	  back_ptr (b)
+      {
+      }
+
+      void print (const char *buf) override
+      {
+	back_ptr->print (buf);
+      }
+
+      base_gdb_plugin<T> *back_ptr;
+    };
+
+    std::unique_ptr<local_connection> connection;
+
+    void (*print_function) (void *datum, const char *message) = nullptr;
+    void *print_datum = nullptr;
+
+    std::vector<std::string> args;
+    std::string source_file;
+
+    /* Non-zero as an equivalent to gcc driver option "-v".  */
+    bool verbose;
+
+    std::unique_ptr<cc1_plugin::compiler> compilerp;
+  };
+
+  // Instances of this rpc<> template function are installed into the
+  // "vtable"s.  These functions are parameterized by type and method
+  // name and forward the call via the connection.
+  template<typename CTX, typename R, const char *&NAME, typename... Arg>
+  R rpc (CTX *s, Arg... rest)
+  {
+    base_gdb_plugin<CTX> *self = (base_gdb_plugin<CTX> *) s;
+    R result;
+    
+    if (!cc1_plugin::call (self->connection.get (), NAME, &result, rest...))
+      return 0;
+    return result;
+  }
+}
+
+#endif // CC1_PLUGIN_GDBCTX_HH