arena.c File Reference

Implementation of the arena.h API. More...

#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <util/alloc.h>
#include <util/arena.h>
#include <util/asan.h>
#include <util/unused.h>

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Data Structures
struct	arena_chunk

Functions
static UNUSED bool	is_power_of_2 (size_t value)
	popcount(value) == 1?
static void	more_core (arena_t *arena, size_t req_alignment, size_t req_size)
static void *	alloc (arena_t *arena, size_t alignment, size_t size)
void *	gv_arena_alloc (arena_t *arena, size_t alignment, size_t size)
char *	gv_arena_strdup (arena_t *arena, const char *s)
void	gv_arena_free (arena_t *arena, void *ptr, size_t size)
void	gv_arena_reset (arena_t *arena)

Function Documentation

alloc()

static void * alloc ( arena_t *  arena, size_t  alignment, size_t  size  )

static

allocate new dynamic memory

Parameters

arena	Arena to allocate from
alignment	Requested alignment
size	Requested size in bytes

Returns

Pointer to allocated memory or NULL on failure

Definition at line 71 of file arena.c.

References ASAN_UNPOISON, is_power_of_2(), NULL, arena_t::remaining, and arena_t::source.

Referenced by gv_arena_alloc().

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gv_arena_alloc()

void * gv_arena_alloc	(	arena_t *	arena,
		size_t	alignment,
		size_t	size
	)

allocate new memory

The requested alignment must be a power of two. The returned memory is zero initialized.

Parameters

arena	Arena to allocate from
alignment	Required pointer alignment for the resulting allocation
size	Number of bytes requested

Returns

Pointer to allocated memory

Definition at line 116 of file arena.c.

References alloc(), more_core(), and NULL.

Referenced by eval(), exprintf(), exsplit(), exstralloc(), exsubstr(), extoken_fn(), extokens(), getdyn(), gv_arena_strdup(), prformat(), scformat(), str_add(), str_and(), str_ior(), str_mod(), str_mpy(), and str_xor().

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gv_arena_free()

void gv_arena_free	(	arena_t *	arena,
		void *	ptr,
		size_t	size
	)

deallocate memory

Parameters

arena	Arena that was previously used to allocate this memory
ptr	Pointer to memory to release
size	Number of bytes of the original allocation

Definition at line 147 of file arena.c.

References ASAN_POISON, and NULL.

Referenced by prformat(), and scformat().

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gv_arena_reset()

void gv_arena_reset

(

arena_t *

arena

)

deallocate all memory

Calling this restores the arena to an empty state from which it can be used for more allocations.

Parameters

arena

Arena to reset

Definition at line 162 of file arena.c.

References free(), NULL, arena_chunk::previous, and arena_t::source.

Referenced by ELcleanup().

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gv_arena_strdup()

char * gv_arena_strdup	(	arena_t *	arena,
		const char *	s
	)

copy a string into new dynamic memory

Parameters

arena	Arena to allocate from
s	Source string to copy

Returns

A copy of the string, hosted in arena-allocated memory

Definition at line 134 of file arena.c.

References gv_arena_alloc(), len(), and NULL.

Referenced by eval(), exstring(), exsub(), extoken_fn(), and prformat().

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is_power_of_2()

static UNUSED bool is_power_of_2 ( size_t  value )

static

Definition at line 23 of file arena.c.

Referenced by alloc().

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more_core()

static void more_core ( arena_t *  arena, size_t  req_alignment, size_t  req_size  )

static

get some more memory from the system allocator

Parameters

arena	Arena to install the new memory into
req_alignment	Alignment request that led to this call
req_size	Size request that led to this call

Definition at line 38 of file arena.c.

References ASAN_POISON, gv_alloc(), NULL, arena_chunk::previous, arena_t::remaining, and arena_t::source.

Referenced by gv_arena_alloc().

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