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1 files changed, 173 insertions, 0 deletions

diff --git a/gcc/params.c b/gcc/params.c
new file mode 100644
index 000000000..95af6cec0
--- /dev/null
+++ b/gcc/params.c
@@ -0,0 +1,173 @@
+/* params.c - Run-time parameters.
+   Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008, 2009, 2010
+   Free Software Foundation, Inc.
+   Written by Mark Mitchell <mark@codesourcery.com>.
+
+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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "params.h"
+#include "diagnostic-core.h"
+
+/* An array containing the compiler parameters and their current
+   values.  */
+
+param_info *compiler_params;
+
+/* The number of entries in the table.  */
+static size_t num_compiler_params;
+
+/* Whether the parameters have all been initialized and had their
+   default values determined.  */
+static bool params_finished;
+
+/* Add the N PARAMS to the current list of compiler parameters.  */
+
+void
+add_params (const param_info params[], size_t n)
+{
+  gcc_assert (!params_finished);
+
+  /* Allocate enough space for the new parameters.  */
+  compiler_params = XRESIZEVEC (param_info, compiler_params,
+				num_compiler_params + n);
+  /* Copy them into the table.  */
+  memcpy (compiler_params + num_compiler_params,
+	  params,
+	  n * sizeof (param_info));
+  /* Keep track of how many parameters we have.  */
+  num_compiler_params += n;
+}
+
+/* Note that all parameters have been added and all default values
+   set.  */
+
+void
+finish_params (void)
+{
+  params_finished = true;
+}
+
+/* Set the value of the parameter given by NUM to VALUE in PARAMS and
+   PARAMS_SET.  If EXPLICIT_P, this is being set by the user;
+   otherwise it is being set implicitly by the compiler.  */
+
+static void
+set_param_value_internal (compiler_param num, int value,
+			  int *params, int *params_set,
+			  bool explicit_p)
+{
+  size_t i = (size_t) num;
+
+  gcc_assert (params_finished);
+
+  params[i] = value;
+  if (explicit_p)
+    params_set[i] = true;
+}
+
+/* Set the VALUE associated with the parameter given by NAME in PARAMS
+   and PARAMS_SET.  */
+
+void
+set_param_value (const char *name, int value,
+		 int *params, int *params_set)
+{
+  size_t i;
+
+  /* Make sure nobody tries to set a parameter to an invalid value.  */
+  gcc_assert (value != INVALID_PARAM_VAL);
+
+  /* Scan the parameter table to find a matching entry.  */
+  for (i = 0; i < num_compiler_params; ++i)
+    if (strcmp (compiler_params[i].option, name) == 0)
+      {
+	if (value < compiler_params[i].min_value)
+	  error ("minimum value of parameter %qs is %u",
+		 compiler_params[i].option,
+		 compiler_params[i].min_value);
+	else if (compiler_params[i].max_value > compiler_params[i].min_value
+		 && value > compiler_params[i].max_value)
+	  error ("maximum value of parameter %qs is %u",
+		 compiler_params[i].option,
+		 compiler_params[i].max_value);
+	else
+	  set_param_value_internal ((compiler_param) i, value,
+				    params, params_set, true);
+	return;
+      }
+
+  /* If we didn't find this parameter, issue an error message.  */
+  error ("invalid parameter %qs", name);
+}
+
+/* Set the value of the parameter given by NUM to VALUE in PARAMS and
+   PARAMS_SET, implicitly, if it has not been set explicitly by the
+   user.  */
+
+void
+maybe_set_param_value (compiler_param num, int value,
+		       int *params, int *params_set)
+{
+  if (!params_set[(int) num])
+    set_param_value_internal (num, value, params, params_set, false);
+}
+
+/* Set the default value of a parameter given by NUM to VALUE, before
+   option processing.  */
+
+void
+set_default_param_value (compiler_param num, int value)
+{
+  gcc_assert (!params_finished);
+
+  compiler_params[(int) num].default_value = value;
+}
+
+/* Return the default value of parameter NUM.  */
+
+int
+default_param_value (compiler_param num)
+{
+  return compiler_params[(int) num].default_value;
+}
+
+/* Initialize an array PARAMS with default values of the
+   parameters.  */
+
+void
+init_param_values (int *params)
+{
+  size_t i;
+
+  gcc_assert (params_finished);
+
+  for (i = 0; i < num_compiler_params; i++)
+    params[i] = compiler_params[i].default_value;
+}
+
+/* Return the current value of num_compiler_params, for the benefit of
+   plugins that use parameters as features.  */
+
+size_t
+get_num_compiler_params (void)
+{
+  return num_compiler_params;
+}