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Reduce allocations overhead

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- uses new `TinyAlloc`-ators for small `TokenSym`, `CString` and
  `TokenString` instances
- conditional `TAL_DEBUG` for mem leaks and double frees detection
- on `TAL_DEBUG` collects allocation origin (file + line)
- conditional `TAL_INFO` for allocators stats (in release mode too)
- chain a new allocator twice current capacity on buffer exhaustion
This commit is contained in:
Vlad Vissoultchev 2016-04-17 16:22:50 +03:00
parent 224236f57c
commit cdc16d428f
2 changed files with 219 additions and 7 deletions
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42
tcc.h
View File

@ -371,6 +371,12 @@ static inline void write64le(unsigned char *p, uint64_t x)
#define TOK_HASH_SIZE 16384 /* must be a power of two */
#define TOK_ALLOC_INCR 512 /* must be a power of two */
#define TOK_MAX_SIZE 4 /* token max size in int unit when stored in string */
#define TOKSYM_TAL_SIZE (768 * 1024) /* allocator for tiny TokenSym in table_ident */
#define TOKSTR_TAL_SIZE (768 * 1024) /* allocator for tiny TokenString instances */
#define CSTR_TAL_SIZE (256 * 1024) /* allocator for tiny CString instances */
#define TOKSYM_TAL_LIMIT 256 /* prefer unique limits to distinguish allocators debug msgs */
#define TOKSTR_TAL_LIMIT 128 /* 32 * sizeof(int) */
#define CSTR_TAL_LIMIT 1024
/* token symbol management */
typedef struct TokenSym {
@ -637,6 +643,42 @@ typedef struct ParseArgsState
CString linker_arg; /* collect -Wl options for input such as "-Wl,-rpath -Wl,<path>" */
} ParseArgsState;
#if !defined(MEM_DEBUG)
#define tal_free(al, p) tal_free_impl(al, p)
#define tal_realloc(al, p, size) tal_realloc_impl(&al, p, size)
#define TAL_DEBUG_PARAMS
#else
#define TAL_DEBUG 1
#define tal_free(al, p) tal_free_impl(al, p, __FILE__, __LINE__)
#define tal_realloc(al, p, size) tal_realloc_impl(&al, p, size, __FILE__, __LINE__)
#define TAL_DEBUG_PARAMS , const char *file, int line
#define TAL_DEBUG_FILE_LEN 15
#endif
//#define TAL_INFO 1 /* collect and dump allocators stats */
typedef struct TinyAlloc {
size_t limit;
size_t size;
uint8_t *buffer;
uint8_t *p;
size_t nb_allocs;
struct TinyAlloc *next, *top;
#ifdef TAL_INFO
size_t nb_peak;
size_t nb_total;
size_t nb_missed;
uint8_t *peak_p;
#endif
} TinyAlloc;
typedef struct tal_header_t {
size_t size;
#ifdef TAL_DEBUG
int line_num; /* negative line_num used for double free check */
char file_name[TAL_DEBUG_FILE_LEN + 1];
#endif
} tal_header_t;
struct TCCState {
int verbose; /* if true, display some information during compilation */

184
tccpp.c
View File

@ -38,6 +38,10 @@ ST_DATA int total_bytes;
ST_DATA int tok_ident;
ST_DATA TokenSym **table_ident;
ST_DATA TinyAlloc *toksym_alloc;
ST_DATA TinyAlloc *tokstr_alloc;
ST_DATA TinyAlloc *cstr_alloc;
/* ------------------------------------------------------------------------- */
static TokenSym *hash_ident[TOK_HASH_SIZE];
@ -125,6 +129,159 @@ ST_FUNC void end_macro(void)
}
}
/* ------------------------------------------------------------------------- */
/* Custom allocator for tiny objects */
ST_FUNC TinyAlloc *tal_new(TinyAlloc **pal, size_t limit, size_t size)
{
TinyAlloc *al = tcc_mallocz(sizeof(TinyAlloc));
al->p = al->buffer = tcc_malloc(size);
al->limit = limit;
al->size = size;
if (pal) *pal = al;
return al;
}
ST_FUNC void tal_delete(TinyAlloc *al)
{
TinyAlloc *next;
tail_call:
if (!al)
return;
#ifdef TAL_INFO
fprintf(stderr, "limit=%5d, size=%5g MB, nb_peak=%6d, nb_total=%8d, nb_missed=%6d, usage=%5.1f%%\n",
al->limit, al->size / 1024.0 / 1024.0, al->nb_peak, al->nb_total, al->nb_missed,
(al->peak_p - al->buffer) * 100.0 / al->size);
#endif
#ifdef TAL_DEBUG
if (al->nb_allocs > 0) {
fprintf(stderr, "TAL_DEBUG: mem leak %d chunks (limit= %d)\n",
al->nb_allocs, al->limit);
uint8_t *p = al->buffer;
while (p < al->p) {
tal_header_t *header = (tal_header_t *)p;
if (header->line_num > 0) {
fprintf(stderr, " file %s, line %u: %u bytes\n",
header->file_name, header->line_num, header->size);
}
p += header->size + sizeof(tal_header_t);
}
}
#endif
next = al->next;
tcc_free(al->buffer);
tcc_free(al);
al = next;
goto tail_call;
}
ST_FUNC void tal_free_impl(TinyAlloc *al, void *p TAL_DEBUG_PARAMS)
{
if (!p)
return;
tail_call:
if (al->buffer <= (uint8_t *)p && (uint8_t *)p < al->buffer + al->size) {
#ifdef TAL_DEBUG
tal_header_t *header = (((tal_header_t *)p) - 1);
if (header->line_num < 0) {
fprintf(stderr, "TAL_DEBUG: file %s, line %u double frees chunk from\n",
file, line);
fprintf(stderr, " file %s, line %u: %u bytes\n",
header->file_name, -header->line_num, header->size);
} else
header->line_num = -header->line_num;
#endif
al->nb_allocs--;
if (!al->nb_allocs)
al->p = al->buffer;
} else if (al->next) {
al = al->next;
goto tail_call;
}
else
tcc_free(p);
}
ST_FUNC void *tal_realloc_impl(TinyAlloc **pal, void *p, size_t size TAL_DEBUG_PARAMS)
{
tal_header_t *header;
void *ret;
int is_own;
size_t adj_size = (size + 3) & -4;
TinyAlloc *al = *pal;
tail_call:
is_own = (al->buffer <= (uint8_t *)p && (uint8_t *)p < al->buffer + al->size);
if ((!p || is_own) && size <= al->limit) {
if (al->p + adj_size + sizeof(tal_header_t) < al->buffer + al->size) {
header = (tal_header_t *)al->p;
header->size = adj_size;
#ifdef TAL_DEBUG
int ofs = strlen(file) - TAL_DEBUG_FILE_LEN;
strncpy(header->file_name, file + (ofs > 0 ? ofs : 0), TAL_DEBUG_FILE_LEN);
header->file_name[TAL_DEBUG_FILE_LEN] = 0;
header->line_num = line;
#endif
ret = al->p + sizeof(tal_header_t);
al->p += adj_size + sizeof(tal_header_t);
if (is_own) {
header = (((tal_header_t *)p) - 1);
memcpy(ret, p, header->size);
#ifdef TAL_DEBUG
header->line_num = -header->line_num;
#endif
} else {
al->nb_allocs++;
}
#ifdef TAL_INFO
if (al->nb_peak < al->nb_allocs)
al->nb_peak = al->nb_allocs;
if (al->peak_p < al->p)
al->peak_p = al->p;
al->nb_total++;
#endif
return ret;
} else if (al->top && is_own) {
al->nb_allocs--;
ret = tal_realloc(*pal, 0, size);
header = (((tal_header_t *)p) - 1);
memcpy(ret, p, header->size);
#ifdef TAL_DEBUG
header->line_num = -header->line_num;
#endif
return ret;
}
if (al->next) {
al = al->next;
} else {
TinyAlloc *bottom = al, *next = al->top ? al->top : al;
al = tal_new(pal, next->limit, next->size * 2);
al->next = next;
bottom->top = al;
}
goto tail_call;
}
if (is_own) {
al->nb_allocs--;
ret = tcc_malloc(size);
header = (((tal_header_t *)p) - 1);
memcpy(ret, p, header->size);
#ifdef TAL_DEBUG
header->line_num = -header->line_num;
#endif
} else if (al->next) {
al = al->next;
goto tail_call;
} else
ret = tcc_realloc(p, size);
#ifdef TAL_INFO
al->nb_missed++;
#endif
return ret;
}
/* ------------------------------------------------------------------------- */
/* CString handling */
static void cstr_realloc(CString *cstr, int new_size)
@ -137,7 +294,7 @@ static void cstr_realloc(CString *cstr, int new_size)
size = 8; /* no need to allocate a too small first string */
while (size < new_size)
size = size * 2;
data = tcc_realloc(cstr->data_allocated, size);
data = tal_realloc(cstr_alloc, cstr->data_allocated, size);
cstr->data_allocated = data;
cstr->size_allocated = size;
cstr->data = data;
@ -185,7 +342,7 @@ ST_FUNC void cstr_new(CString *cstr)
/* free string and reset it to NULL */
ST_FUNC void cstr_free(CString *cstr)
{
tcc_free(cstr->data_allocated);
tal_free(cstr_alloc, cstr->data_allocated);
cstr_new(cstr);
}
@ -233,7 +390,7 @@ static TokenSym *tok_alloc_new(TokenSym **pts, const char *str, int len)
table_ident = ptable;
}
ts = tcc_realloc(0, sizeof(TokenSym) + len);
ts = tal_realloc(toksym_alloc, 0, sizeof(TokenSym) + len);
table_ident[i] = ts;
ts->tok = tok_ident++;
ts->sym_define = NULL;
@ -942,14 +1099,14 @@ ST_FUNC int *tok_str_dup(TokenString *s)
{
int *str;
str = tcc_realloc(0, s->len * sizeof(int));
str = tal_realloc(tokstr_alloc, 0, s->len * sizeof(int));
memcpy(str, s->str, s->len * sizeof(int));
return str;
}
ST_FUNC void tok_str_free(int *str)
{
tcc_free(str);
tal_free(tokstr_alloc, str);
}
ST_FUNC int *tok_str_realloc(TokenString *s, int new_size)
@ -963,7 +1120,7 @@ ST_FUNC int *tok_str_realloc(TokenString *s, int new_size)
size = size * 2;
TCC_ASSERT((size & (size -1)) == 0);
if (size > s->allocated_len) {
str = tcc_realloc(s->str, size * sizeof(int));
str = tal_realloc(tokstr_alloc, s->str, size * sizeof(int));
s->allocated_len = size;
s->str = str;
}
@ -3449,6 +3606,11 @@ ST_FUNC void preprocess_new(void)
for(i = 128; i<256; i++)
isidnum_table[i - CH_EOF] = IS_ID;
/* init allocators */
tal_new(&toksym_alloc, TOKSYM_TAL_LIMIT, TOKSYM_TAL_SIZE);
tal_new(&tokstr_alloc, TOKSTR_TAL_LIMIT, TOKSTR_TAL_SIZE);
tal_new(&cstr_alloc, CSTR_TAL_LIMIT, CSTR_TAL_SIZE);
memset(hash_ident, 0, TOK_HASH_SIZE * sizeof(TokenSym *));
cstr_new(&cstr_buf);
cstr_realloc(&cstr_buf, STRING_MAX_SIZE);
@ -3484,7 +3646,7 @@ ST_FUNC void preprocess_delete(void)
/* free tokens */
n = tok_ident - TOK_IDENT;
for(i = 0; i < n; i++)
tcc_free(table_ident[i]);
tal_free(toksym_alloc, table_ident[i]);
tcc_free(table_ident);
table_ident = NULL;
@ -3492,6 +3654,14 @@ ST_FUNC void preprocess_delete(void)
cstr_free(&tokcstr);
cstr_free(&cstr_buf);
tok_str_free(tokstr_buf.str);
/* free allocators */
tal_delete(toksym_alloc);
toksym_alloc = NULL;
tal_delete(tokstr_alloc);
tokstr_alloc = NULL;
tal_delete(cstr_alloc);
cstr_alloc = NULL;
}
/* Preprocess the current file */