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111
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1 /* { dg-options "-O" } */
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2
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3 /* Mark all CALL_EXPRs not within "main" as requiring tail-call. */
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4
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5 #include "gcc-plugin.h"
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6 #include "config.h"
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7 #include "system.h"
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8 #include "coretypes.h"
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9 #include "tm.h"
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10 #include "tree.h"
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11 #include "stringpool.h"
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12 #include "toplev.h"
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13 #include "basic-block.h"
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14 #include "hash-table.h"
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15 #include "vec.h"
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16 #include "ggc.h"
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17 #include "basic-block.h"
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18 #include "tree-ssa-alias.h"
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19 #include "internal-fn.h"
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20 #include "gimple-fold.h"
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21 #include "tree-eh.h"
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22 #include "gimple-expr.h"
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23 #include "is-a.h"
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24 #include "tree.h"
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25 #include "tree-pass.h"
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26 #include "intl.h"
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27 #include "plugin-version.h"
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28
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29 int plugin_is_GPL_compatible;
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30
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31 tree
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32 cb_walk_tree_fn (tree * tp, int * walk_subtrees,
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33 void * data ATTRIBUTE_UNUSED)
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34 {
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35 if (TREE_CODE (*tp) != CALL_EXPR)
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36 return NULL_TREE;
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37
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38 tree call_expr = *tp;
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39
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40 /* Forcibly mark the CALL_EXPR as requiring tail-call optimization. */
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41 CALL_EXPR_MUST_TAIL_CALL (call_expr) = 1;
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42
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43 return NULL_TREE;
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44 }
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45
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46 static void
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47 callback (void *gcc_data, void *user_data)
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48 {
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49 tree fndecl = (tree)gcc_data;
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50 gcc_assert (TREE_CODE (fndecl) == FUNCTION_DECL);
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51
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52 /* Don't mark calls inside "main". */
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53 tree decl_name = DECL_NAME (fndecl);
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54 if (decl_name)
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55 if (0 == strcmp (IDENTIFIER_POINTER (decl_name), "main"))
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56 return;
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57
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58 walk_tree (&DECL_SAVED_TREE (fndecl), cb_walk_tree_fn, NULL, NULL);
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59 }
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60
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61 int
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62 plugin_init (struct plugin_name_args *plugin_info,
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63 struct plugin_gcc_version *version)
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64 {
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65 const char *plugin_name = plugin_info->base_name;
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66
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67 if (!plugin_default_version_check (version, &gcc_version))
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68 return 1;
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69
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70 register_callback (plugin_name,
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71 PLUGIN_PRE_GENERICIZE,
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72 callback,
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73 NULL);
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74
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75 return 0;
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76 }
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