Revert "ARB prog parser: Fix epic memory leak in lexer / parser interface"

This reverts commit 93dae6761b.

This change was completely broken when the parser uses multiple
strings in a single production.  It would be nice if bug fixes could
initially land somewhere other than the stable branch.

src/mesa/shader/program_lexer.l

@@ -40,7 +40,7 @@
       if (condition) {					\
 	 return token;					\
       } else {						\
-	 yylval->string = return_string(yyextra, yytext);	\
+	 yylval->string = strdup(yytext);		\
 	 return IDENTIFIER;				\
       }							\
    } while (0)
@@ -63,7 +63,7 @@
 	 yylval->temp_inst.SaturateMode = SATURATE_ ## sat; \
 	 return token;					\
       } else {						\
-	 yylval->string = return_string(yyextra, yytext);		\
+	 yylval->string = strdup(yytext);		\
 	 return IDENTIFIER;				\
       }							\
    } while (0)
@@ -71,45 +71,6 @@
 #define SWIZZLE_INVAL  MAKE_SWIZZLE4(SWIZZLE_NIL, SWIZZLE_NIL, \
 				     SWIZZLE_NIL, SWIZZLE_NIL)
 
-/**
- * Send a string to the parser using asm_parser_state::string_dumpster
- *
- * Sends a string to the parser using asm_parser_state::string_dumpster as a
- * temporary storage buffer.  Data previously stored in
- * asm_parser_state::string_dumpster will be lost.  If
- * asm_parser_state::string_dumpster is not large enough to hold the new
- * string, the buffer size will be increased.  The buffer size is \b never
- * decreased.
- *
- * \param state   Assembler parser state tracking
- * \param str     String to be passed to the parser
- *
- * \return
- * A pointer to asm_parser_state::string_dumpster on success or \c NULL on
- * failure.  Currently the only failure case is \c ENOMEM.
- */
-static char *
-return_string(struct asm_parser_state *state, const char *str)
-{
-   const size_t len = strlen(str);
-
-   if (len >= state->dumpster_size) {
-      char *const dumpster = _mesa_realloc(state->string_dumpster,
-					   state->dumpster_size,
-					   len + 1);
-      if (dumpster == NULL) {
-	 return NULL;
-      }
-
-      state->string_dumpster = dumpster;
-      state->dumpster_size = len + 1;
-   }
-
-   memcpy(state->string_dumpster, str, len + 1);
-   return state->string_dumpster;
-}
-
-
 static unsigned
 mask_from_char(char c)
 {
@@ -347,7 +308,7 @@ ARRAYSHADOW1D             { return_token_or_IDENTIFIER(require_ARB_fp && require
 ARRAYSHADOW2D             { return_token_or_IDENTIFIER(require_ARB_fp && require_shadow && require_texarray, TEX_ARRAYSHADOW2D); }
 
 [_a-zA-Z$][_a-zA-Z0-9$]*  {
-   yylval->string = return_string(yyextra, yytext);
+   yylval->string = strdup(yytext);
    return IDENTIFIER;
 }
 

src/mesa/shader/program_parse.tab.c

@@ -4565,7 +4565,7 @@ yyreduce:
 		      "undefined variable binding in ALIAS statement");
 	      YYERROR;
 	   } else {
-	      _mesa_symbol_table_add_symbol(state->st, 0, strdup((yyvsp[(2) - (4)].string)), target);
+	      _mesa_symbol_table_add_symbol(state->st, 0, (yyvsp[(2) - (4)].string), target);
 	   }
 	;}
     break;
@@ -4896,14 +4896,10 @@ declare_variable(struct asm_parser_state *state, char *name, enum asm_type t,
    if (exist != NULL) {
       yyerror(locp, state, "redeclared identifier");
    } else {
-      const size_t name_len = strlen(name);
-
-      s = calloc(1, sizeof(struct asm_symbol) + name_len + 1);
-      s->name = (char *)(s + 1);
+      s = calloc(1, sizeof(struct asm_symbol));
+      s->name = name;
       s->type = t;
 
-      memcpy((char *) s->name, name, name_len + 1);
-
       switch (t) {
       case at_temp:
 	 if (state->prog->NumTemporaries >= state->limits->MaxTemps) {
@@ -5151,11 +5147,6 @@ _mesa_parse_arb_program(GLcontext *ctx, GLenum target, const GLubyte *str,
    _mesa_memcpy (strz, str, len);
    strz[len] = '\0';
 
-   if (state->prog->String != NULL) {
-      _mesa_free(state->prog->String);
-      state->prog->String = NULL;
-   }
-
    state->prog->String = strz;
 
    state->st = _mesa_symbol_table_ctor();
@@ -5245,6 +5236,7 @@ error:
    for (sym = state->sym; sym != NULL; sym = temp) {
       temp = sym->next;
 
+      _mesa_free((void *) sym->name);
       _mesa_free(sym);
    }
    state->sym = NULL;
@@ -5252,11 +5244,6 @@ error:
    _mesa_symbol_table_dtor(state->st);
    state->st = NULL;
 
-   if (state->string_dumpster != NULL) {
-      _mesa_free(state->string_dumpster);
-      state->dumpster_size = 0;
-   }
-
    return result;
 }
 

src/mesa/shader/program_parse.y

@@ -1919,7 +1919,7 @@ ALIAS_statement: ALIAS IDENTIFIER '=' IDENTIFIER
 		      "undefined variable binding in ALIAS statement");
 	      YYERROR;
 	   } else {
-	      _mesa_symbol_table_add_symbol(state->st, 0, strdup($2), target);
+	      _mesa_symbol_table_add_symbol(state->st, 0, $2, target);
 	   }
 	}
 	;
@@ -2027,14 +2027,10 @@ declare_variable(struct asm_parser_state *state, char *name, enum asm_type t,
    if (exist != NULL) {
       yyerror(locp, state, "redeclared identifier");
    } else {
-      const size_t name_len = strlen(name);
-
-      s = calloc(1, sizeof(struct asm_symbol) + name_len + 1);
-      s->name = (char *)(s + 1);
+      s = calloc(1, sizeof(struct asm_symbol));
+      s->name = name;
       s->type = t;
 
-      memcpy((char *) s->name, name, name_len + 1);
-
       switch (t) {
       case at_temp:
 	 if (state->prog->NumTemporaries >= state->limits->MaxTemps) {
@@ -2284,7 +2280,6 @@ _mesa_parse_arb_program(GLcontext *ctx, GLenum target, const GLubyte *str,
 
    if (state->prog->String != NULL) {
       _mesa_free(state->prog->String);
-      state->prog->String = NULL;
    }
 
    state->prog->String = strz;
@@ -2376,6 +2371,7 @@ error:
    for (sym = state->sym; sym != NULL; sym = temp) {
       temp = sym->next;
 
+      _mesa_free((void *) sym->name);
       _mesa_free(sym);
    }
    state->sym = NULL;
@@ -2383,10 +2379,5 @@ error:
    _mesa_symbol_table_dtor(state->st);
    state->st = NULL;
 
-   if (state->string_dumpster != NULL) {
-      _mesa_free(state->string_dumpster);
-      state->dumpster_size = 0;
-   }
-
    return result;
 }

src/mesa/shader/program_parser.h

@@ -38,13 +38,6 @@ enum asm_type {
    at_output,
 };
 
-/**
- * \note
- * Objects of this type are allocated as the object plus the name of the
- * symbol.  That is, malloc(sizeof(struct asm_symbol) + strlen(name) + 1).
- * Alternately, asm_symbol::name could be moved to the bottom of the structure
- * and declared as 'char name[0];'.
- */
 struct asm_symbol {
    struct asm_symbol *next;    /**< List linkage for freeing. */
    const char *name;
@@ -164,15 +157,6 @@ struct asm_parser_state {
    /*@}*/
 
 
-   /**
-    * Buffer to hold strings transfered from the lexer to the parser
-    */
-   /*@{*/
-   char *string_dumpster;      /**< String data transfered. */
-   size_t dumpster_size;       /**< Total size, in bytes, of the buffer. */
-   /*@}*/
-
-
    /**
     * Selected limits copied from gl_constants
     *