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pseudostack instrumentation (off by default)

--- a/celt/stack_alloc.h

+++ b/celt/stack_alloc.h

@@ -116,9 +116,11 @@

 #else

 #ifdef CELT_C

+char *scratch_ptr=0;

 char *global_stack=0;

 #else

 extern char *global_stack;

+extern char *scratch_ptr;

 #endif /* CELT_C */

 #ifdef ENABLE_VALGRIND

@@ -140,8 +142,12 @@

 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))

 #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)/sizeof(char)),(stack)+=(size)*(sizeof(type)/sizeof(char)),(type*)((stack)-(size)*(sizeof(type)/sizeof(char))))

+#if 0 /* Set this to 1 to instrument pseudostack usage */

+#define RESTORE_STACK (printf("%ld %s:%d\n", global_stack-scratch_ptr, __FILE__, __LINE__),global_stack = _saved_stack)

+#else

 #define RESTORE_STACK (global_stack = _saved_stack)

-#define ALLOC_STACK char *_saved_stack; (global_stack = (global_stack==0) ? opus_alloc_scratch(GLOBAL_STACK_SIZE) : global_stack); _saved_stack = global_stack;

+#endif

+#define ALLOC_STACK char *_saved_stack; (global_stack = (global_stack==0) ? (scratch_ptr=opus_alloc_scratch(GLOBAL_STACK_SIZE)) : global_stack); _saved_stack = global_stack;

 #endif /* ENABLE_VALGRIND */