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Initial support for a managed stack/scratchpad. Still needs some work.

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This commit is contained in:
Jean-Marc Valin 2008-02-29 15:14:12 +11:00
parent 8b2a59235f
commit 8600f69f79
12 changed files with 114 additions and 18 deletions
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40
libcelt/stack_alloc.h
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@ -84,32 +84,52 @@
* @param type Type of element
*/
#if defined(VAR_ARRAYS)
#define VARDECL(var)
#define ALLOC(var, size, type) type var[size]
#define SAVE_STACK
#define RESTORE_STACK
#elif defined(USE_ALLOCA)
#define VARDECL(var) var
#define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size)))
#define SAVE_STACK
#define RESTORE_STACK
#else
#ifdef ENABLE_VALGRIND
#include <valgrind/memcheck.h>
#define ALLOC_STACK(stack) (stack = (stack==0) ? celt_alloc_scratch(30000) : stack, VALGRIND_MAKE_NOACCESS(stack, 1000))
#define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
#define PUSH(stack, size, type) (VALGRIND_MAKE_NOACCESS(stack, 1000),ALIGN((stack),sizeof(type)),VALGRIND_MAKE_WRITABLE(stack, ((size)*sizeof(type))),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type))))
#define RESTORE_STACK ((global_stack = _saved_stack),VALGRIND_MAKE_NOACCESS(global_stack, 1000))
#else
#define ALLOC_STACK(stack) (stack = (stack==0) ? celt_alloc_scratch(30000) : stack)
#define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
#define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type))))
#define RESTORE_STACK (global_stack = _saved_stack)
#endif
#if defined(VAR_ARRAYS)
#define VARDECL(var)
#define ALLOC(var, size, type) type var[size]
#elif defined(USE_ALLOCA)
#define VARDECL(var) var
#define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size)))
#ifdef CELT_C
char *global_stack=0;
#else
/*#define VARDECL(var) var
#define ALLOC(var, size, type) var = PUSH(stack, size, type)*/
#error scratchpad not yet supported, you need to define either VAR_ARRAYS or USE_ALLOCA
extern char *global_stack;
#endif
#include "os_support.h"
#define VARDECL(var) var
#define ALLOC(var, size, type) var = PUSH(global_stack, size, type)
#define SAVE_STACK char *_saved_stack; ALLOC_STACK(global_stack);_saved_stack = global_stack;
#endif