There are three areas causing memory leaks within this file, which I will take 
as a single and a double.

On line 3884 a call to grammar check is made during which memory is assigned to 
the variable "parsed". This memory is not released before the subsequent call 
to grammer_fast_check at line 3953. Thereafter the second allocation 
to "parsed" is freed at line 4035. To rectify this a copy of line 4035 should 
be inserted between the two grammar_check calls.

Subsequently while parsing the function "parse_param_use" at line 1934 
calls "mesa_strdup" to duplicate a string to be stored in the 
variable 'param_var->name'. Similarly in the function "parse_source_reg" at 
line 2463 there is a call to "mesa_strdup" to duplicate a string to be stored 
in the variable 'src->name'. Both 'param_var' and 'src' are of type 'struct 
var_cache*'. When this structure is later deleted the variable 'name' is not 
freed, possibly because it could have been allocated by the user rather than by 
mesa internally. I overcame this problem by declaring an additional variable in 
the structure definition commencing at line 519

    GLuint name_allocated;

In the function "var_cache_create" at lines 547ff I added a line to to 
initialise the new variable to 0.

    (**va).name_allocated = 0;

In the two functions referred to above I added additional lines to set the 
variable to 1 when the "_mesa_strdup" function was called.

    param_var->name_allocated = 1;

    src->name_allocated = 1;

Finally, in the function var_cache_destroy at lines 566ff I added the following 
two lines to free any allocated memory

    if ((*va)->name_allocated)
        mesa_free ((*va)->name);

With these changes the memory leaks were eliminated.