parse.lac: implement exploratory stack reallocations.

[bison.git] / ChangeLog

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+2010-12-11  Joel E. Denny  <jdenny@clemson.edu>
+
+       parse.lac: implement exploratory stack reallocations.
+       * data/yacc.c: Rename %define variable parse.lac.es-capacity to
+       parse.lac.es-capacity-initial.  Accept parse.lac.memory-trace
+       with values of "failures" (default) or "full".
+       (b4_declare_parser_state_variables): Add yyesa, yyes, and
+       yyes_capacity variables.
+       (YYSTACK_USE_ALLOCA): Ignore it if LAC requested.
+       (YYSTACK_ALLOC, YYSTACK_FREE, YYSTACK_ALLOC_MAXIMUM): Define if
+       LAC requested.
+       (YYCOPY_NEEDED): New cpp macro.
+       (YYCOPY): Define if LAC requested.
+       (yy_lac_stack_realloc): New function implementing stack
+       reallocations.  Use YYMAXDEPTH for maximum stack size given that
+       the stack should never need to grow larger than the main state
+       stack needs to grow without LAC.
+       (YY_LAC_ESTABLISH): Update yy_lac invocation.
+       (yy_lac): Add arguments for exploratory stack memory data
+       recorded in the main parser.  Invoke yy_lac_stack_realloc when
+       reallocation is necessary.
+       (yysyntax_error): Add the same new arguments and pass them to
+       yy_lac.
+       (yypstate_delete): Free yyes if necessary.
+       (yyesa, yyes, yyes_capacity): #define these to yypstate members
+       in the case of push parsing.
+       (yyparse, yypush_parse): Initialize yyes and yyes_capacity.
+       Update yysyntax_error invocations.  At yyreturn, free yyes if
+       necessary.
+       * src/parse-gram.y: %define parse.lac full.
+       * tests/input.at (LAC: errors for %define): Extend for
+       parse.lac-memory-trace.
+       * tests/regression.at (LAC: Exploratory stack): Extend to check
+       that stack reallocs happen when expected.
+       (LAC: Memory exhaustion): Update to use YYMAXDEPTH and
+       parse.lac.es-capacity-initial.
+
 2010-12-11  Joel E. Denny  <jdenny@clemson.edu>
 
        parse.lac: implement as %define variable.