making exported vars available from C code

Addes an array of exports to runtime data. Also declares each export as an
integer. The value of the export can be passed to colm_get_gloal(). They are
named colm_export_<export-name>. refs #116.

src/pdabuild.cc

@@ -1681,6 +1681,36 @@ void Compiler::makeRuntimeData()
 
 	runtimeData->global_size = globalObjectDef->size();
 
+	/*
+	 * Exports.
+	 */
+	count = 0;
+	for ( FieldList::Iter of = globalObjectDef->fieldList; of.lte(); of++ ) {
+		ObjectField *field = of->value;
+		if ( field->isExport ) {
+			count += 1;
+		}
+	}
+
+	runtimeData->num_exports = count;
+	if ( count == 0 ) {
+		runtimeData->export_info = 0;
+	}
+	else {
+		runtimeData->export_info = new export_info[count];
+
+		long i = 0;
+		for ( FieldList::Iter of = globalObjectDef->fieldList; of.lte(); of++ ) {
+			ObjectField *field = of->value;
+			if ( field->isExport ) {
+				runtimeData->export_info[i].name = strdup( field->name );
+				runtimeData->export_info[i].global_id = field->offset;
+				i += 1;
+			}
+		}
+	}
+
+
 	/*
 	 * Boundary between terms and non-terms.
 	 */

src/pdacodegen.cc

@@ -453,6 +453,24 @@ void PdaCodeGen::writeRuntimeData( colm_sections *runtimeData, struct pda_tables
 		"void " << objectName << "_read_reduce( program_t *prg, int reducer, input_t *stream );\n"
 		"\n";
 
+	out <<
+		"static struct export_info " << exportInfo() << "[] = {\n";
+
+	for ( long i = 0; i < runtimeData->num_exports; i++ ) {
+		out << "	{ \"" << runtimeData->export_info[i].name << "\", " <<
+				runtimeData->export_info[i].global_id << " },\n";
+	}
+
+	out <<
+		"};\n";
+
+	for ( long i = 0; i < runtimeData->num_exports; i++ ) {
+		out << "const int colm_export_" << runtimeData->export_info[i].name << " = " <<
+				runtimeData->export_info[i].global_id << ";\n";
+	}
+	out <<
+		"\n";
+
 	out <<
 		"struct colm_sections " << objectName << " = \n"
 		"{\n"
@@ -486,6 +504,10 @@ void PdaCodeGen::writeRuntimeData( colm_sections *runtimeData, struct pda_tables
 		"\n"
 		"	" << genericInfo() << ",\n"
 		"	" << runtimeData->num_generics << ",\n"
+		"\n"
+		"	" << exportInfo() << ",\n"
+		"	" << runtimeData->num_exports << ",\n"
+		"\n"
 		"	" << runtimeData->argv_generic_id << ",\n"
 		"	" << runtimeData->stds_generic_id << ",\n"
 		"\n"

src/pdacodegen.h

@@ -83,6 +83,7 @@ struct PdaCodeGen
 	String litlen() { return PARSER() + "litlen"; }
 	String literals() { return PARSER() + "literals"; }
 	String fsmTables() { return PARSER() + "fsmTables"; }
+	String exportInfo() { return PARSER() + "exportInfo"; }
 
 	/* 
 	 * Graphviz Generation

src/program.h

@@ -37,6 +37,12 @@ struct stack_block
 	struct stack_block *next;
 };
 
+struct export_info
+{
+	const char *name;
+	int global_id;
+};
+
 struct colm_sections
 {
 	struct lang_el_info *lel_info;
@@ -70,6 +76,9 @@ struct colm_sections
 	struct generic_info *generic_info;
 	long num_generics;
 
+	struct export_info *export_info;
+	long num_exports;
+
 	long argv_generic_id;
 	long stds_generic_id;