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scratch: add stack frame support

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Andrew Poelstra
2018-03-20 13:21:33 +00:00
parent 9bc2e26502
commit 6fe50439ae
8 changed files with 92 additions and 76 deletions
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26
src/scratch.h
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@@ -7,29 +7,33 @@
#ifndef _SECP256K1_SCRATCH_
#define _SECP256K1_SCRATCH_
#define SECP256K1_SCRATCH_MAX_FRAMES 5
/* The typedef is used internally; the struct name is used in the public API
* (where it is exposed as a different typedef) */
typedef struct secp256k1_scratch_space_struct {
void *data;
size_t offset;
size_t init_size;
void *data[SECP256K1_SCRATCH_MAX_FRAMES];
size_t offset[SECP256K1_SCRATCH_MAX_FRAMES];
size_t frame_size[SECP256K1_SCRATCH_MAX_FRAMES];
size_t frame;
size_t max_size;
const secp256k1_callback* error_callback;
} secp256k1_scratch;
static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t init_size, size_t max_size);
static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t max_size);
static void secp256k1_scratch_destroy(secp256k1_scratch* scratch);
/** Attempts to allocate a new stack frame with `n` available bytes. Returns 1 on success, 0 on failure */
static int secp256k1_scratch_allocate_frame(secp256k1_scratch* scratch, size_t n, size_t objects);
/** Deallocates a stack frame */
static void secp256k1_scratch_deallocate_frame(secp256k1_scratch* scratch);
/** Returns the maximum allocation the scratch space will allow */
static size_t secp256k1_scratch_max_allocation(const secp256k1_scratch* scratch, size_t n_objects);
/** Attempts to allocate so that there are `n` available bytes. Returns 1 on success, 0 on failure */
static int secp256k1_scratch_resize(secp256k1_scratch* scratch, size_t n, size_t n_objects);
/** Returns a pointer into the scratch space or NULL if there is insufficient available space */
/** Returns a pointer into the most recently allocated frame, or NULL if there is insufficient available space */
static void *secp256k1_scratch_alloc(secp256k1_scratch* scratch, size_t n);
/** Resets the returned pointer to the beginning of space */
static void secp256k1_scratch_reset(secp256k1_scratch* scratch);
#endif