parsergen: allow prefix code for do_reduce to be provided.

[ocean] / csrc / parsergen.mdc

diff --git a/csrc/parsergen.mdc b/csrc/parsergen.mdc
index 2fdbf453c8114746843e5b3f95ee2ab07b570932..478482e0f6b0512b9fc09946b4b1b5ead04fe7fd 100644 (file)
--- a/csrc/parsergen.mdc
+++ b/csrc/parsergen.mdc
@@ -1872,13 +1872,14 @@ pieces of code provided in the grammar file, so they are generated first.
 
 ###### parser_generate
 
-       static void gen_parser(FILE *f, struct grammar *g, char *file, char *name)
+       static void gen_parser(FILE *f, struct grammar *g, char *file, char *name,
+                              struct code_node *pre_reduce)
        {
                gen_known(f, g);
                gen_non_term(f, g);
                gen_goto(f, g);
                gen_states(f, g);
-               gen_reduce(f, g, file);
+               gen_reduce(f, g, file, pre_reduce);
                gen_free(f, g);
 
                fprintf(f, "#line 0 \"gen_parser\"\n");
@@ -2112,14 +2113,18 @@ automatically freed.  This is equivalent to assigning `NULL` to the pointer.
 
 ###### functions
 
-       static void gen_reduce(FILE *f, struct grammar *g, char *file)
+       static void gen_reduce(FILE *f, struct grammar *g, char *file,
+                              struct code_node *code)
        {
                int i;
-               fprintf(f, "#line 0 \"gen_reduce\"\n");
+               fprintf(f, "#line 1 \"gen_reduce\"\n");
                fprintf(f, "static int do_reduce(int prod, void **body, struct token_config *config, void *ret)\n");
                fprintf(f, "{\n");
                fprintf(f, "\tint ret_size = 0;\n");
+               if (code)
+                       code_node_print(f, code, file);
 
+               fprintf(f, "#line 4 \"gen_reduce\"\n");
                fprintf(f, "\tswitch(prod) {\n");
                for (i = 0; i < g->production_count; i++) {
                        struct production *p = g->productions[i];
@@ -2316,6 +2321,7 @@ parser with neither. "grammar" must be provided.
        struct code_node *hdr = NULL;
        struct code_node *code = NULL;
        struct code_node *gram = NULL;
+       struct code_node *pre_reduce = NULL;
        for (s = table; s; s = s->next) {
                struct text sec = s->section;
                if (tag && !strip_tag(&sec, tag))
@@ -2326,6 +2332,8 @@ parser with neither. "grammar" must be provided.
                        code = s->code;
                else if (text_is(sec, "grammar"))
                        gram = s->code;
+               else if (text_is(sec, "reduce"))
+                       pre_reduce = s->code;
                else {
                        fprintf(stderr, "Unknown content section: %.*s\n",
                                s->section.len, s->section.txt);
@@ -2397,7 +2405,7 @@ file with the code section (if any) and the parser tables and function.
                if (f) {
                        if (code)
                                code_node_print(f, code, infile);
-                       gen_parser(f, g, infile, name);
+                       gen_parser(f, g, infile, name, pre_reduce);
                        fclose(f);
                } else {
                        fprintf(stderr, "Cannot create %s.c\n",