Hi John, I guess your "strdup" eats the memory. You need to manage this dynamic memory somewhere in the parser/your program.
Maybe interesting for you: in case of automated parser recovery, bison offers %destructor[1] to handle memory of automatically discarded symbols. [1] http://www.gnu.org/software/bison/manual/html_node/Destructor-Decl.html Yours Alex On 06/19/2015 12:31 AM, John W wrote: > I have a multithreaded application and was testing my mock code for > memory leaks. Running the code below results in rapid memory growth of > the application. > > It was my understanding that calling yy_delete_buffer(buf, scanner) and > subsequently yylex_destroy(scanner) would be all I need to do to free up > the memory? > > Any help would be greatly appreciated. Thanks! > > > > flex.l: > > %{ > #include <stdlib.h> > #include <string.h> > > #include "yacc.tab.h" > %} > > %option reentrant > %option bison-bridge > > %% > > [\\&] return AMP; > [[:alnum:]]+ yylval->strval=strdup(yytext); return TOK_WORD; > [=] return EQ; > ^[\\?] return QM; > > > > > yacc.y: > > %{ > typedef struct yy_buffer_state *YY_BUFFER_STATE; > > extern YY_BUFFER_STATE yy_scan_string(const char *, void *); > extern void yy_delete_buffer(YY_BUFFER_STATE, void *); > void yyerror(void *, char *); > > %} > > %union { > u_node *node; > char *strval; > }; > > %pure-parser > %lex-param {void *scanner} > %parse-param {void *scanner} > > %token <strval> TOK_WORD AMP EQ QM > > %type <node> pair > > %% > > grammar : QM pair; > > pair : TOK_WORD EQ TOK_WORD > | TOK_WORD EQ TOK_WORD AMP pair > ; > > %% > > int > main(void) > { > char string[50] = "?key=value&key2=value2"; > void *scanner; > > while(1) { > yylex_init(&scanner); > YY_BUFFER_STATE buffer = yy_scan_string(string, scanner); > yyparse(scanner); > yy_delete_buffer(buffer, scanner); > yylex_destroy(scanner); > } > > return 0; > } > > int > yywrap(void) { > return 1; > } > > void > yyerror(void *scanner, char *s) > { > fprintf(stderr, "Error: %s\n", s); > } > > > _______________________________________________ > help-bison@gnu.org https://lists.gnu.org/mailman/listinfo/help-bison > _______________________________________________ help-bison@gnu.org https://lists.gnu.org/mailman/listinfo/help-bison
