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py: Allocate parse nodes in chunks to reduce fragmentation and RAM use.

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With this patch parse nodes are allocated sequentially in chunks.  This
reduces fragmentation of the heap and prevents waste at the end of
individually allocated parse nodes.

Saves roughly 20% of RAM during parse stage.
This commit is contained in:
Damien George 2015-09-23 10:50:43 +01:00
parent e5635f4ab3
commit 58e0f4ac50
12 changed files with 123 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
bare-arm/main.c
View File

@ -16,8 +16,8 @@ void do_str(const char *src, mp_parse_input_kind_t input_kind) {
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
qstr source_name = lex->source_name;
mp_parse_node_t pn = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(pn, source_name, MP_EMIT_OPT_NONE, true);
mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, true);
mp_call_function_0(module_fun);
nlr_pop();
} else {

4
minimal/main.c
View File

@ -19,8 +19,8 @@ void do_str(const char *src, mp_parse_input_kind_t input_kind) {
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
qstr source_name = lex->source_name;
mp_parse_node_t pn = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(pn, source_name, MP_EMIT_OPT_NONE, true);
mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, true);
mp_call_function_0(module_fun);
nlr_pop();
} else {

6
py/compile.c
View File

@ -3317,7 +3317,7 @@ STATIC void scope_compute_things(scope_t *scope) {
}
}
mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is_repl) {
mp_obj_t mp_compile(mp_parse_tree_t *parse_tree, qstr source_file, uint emit_opt, bool is_repl) {
// put compiler state on the stack, it's relatively small
compiler_t comp_state = {0};
compiler_t *comp = &comp_state;
@ -3326,7 +3326,7 @@ mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is
comp->is_repl = is_repl;
// create the module scope
scope_t *module_scope = scope_new_and_link(comp, SCOPE_MODULE, pn, emit_opt);
scope_t *module_scope = scope_new_and_link(comp, SCOPE_MODULE, parse_tree->root, emit_opt);
// optimise constants (scope must be set for error messages to work)
comp->scope_cur = module_scope;
@ -3485,7 +3485,7 @@ mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is
#endif
// free the parse tree
mp_parse_node_free(module_scope->pn);
mp_parse_tree_clear(parse_tree);
// free the scopes
mp_raw_code_t *outer_raw_code = module_scope->raw_code;

4
py/compile.h
View File

@ -40,8 +40,8 @@ enum {
};
// the compiler will raise an exception if an error occurred
// the compiler will free the parse tree (pn) before it returns
mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is_repl);
// the compiler will clear the parse tree before it returns
mp_obj_t mp_compile(mp_parse_tree_t *parse_tree, qstr source_file, uint emit_opt, bool is_repl);
// this is implemented in runtime.c
mp_obj_t mp_parse_compile_execute(mp_lexer_t *lex, mp_parse_input_kind_t parse_input_kind, mp_obj_dict_t *globals, mp_obj_dict_t *locals);

6
py/mpconfig.h
View File

@ -118,6 +118,12 @@
#define MICROPY_ALLOC_PARSE_INTERN_STRING_LEN (10)
#endif
// Number of bytes to allocate initially when creating new chunks to store
// parse nodes. Small leads to fragmentation, large leads to excess use.
#ifndef MICROPY_ALLOC_PARSE_CHUNK_INIT
#define MICROPY_ALLOC_PARSE_CHUNK_INIT (128)
#endif
// Initial amount for ids in a scope
#ifndef MICROPY_ALLOC_SCOPE_ID_INIT
#define MICROPY_ALLOC_SCOPE_ID_INIT (4)

125
py/parse.c
View File

@ -112,6 +112,15 @@ typedef struct _rule_stack_t {
mp_uint_t arg_i; // this dictates the maximum nodes in a "list" of things
} rule_stack_t;
typedef struct _mp_parse_chunk_t {
mp_uint_t alloc;
union {
mp_uint_t used;
struct _mp_parse_chunk_t *next;
} union_;
byte data[];
} mp_parse_chunk_t;
typedef struct _parser_t {
bool had_memory_error;
@ -124,12 +133,56 @@ typedef struct _parser_t {
mp_parse_node_t *result_stack;
mp_lexer_t *lexer;
mp_parse_tree_t tree;
mp_parse_chunk_t *cur_chunk;
} parser_t;
STATIC inline void memory_error(parser_t *parser) {
parser->had_memory_error = true;
}
STATIC void *parser_alloc(parser_t *parser, size_t num_bytes) {
// use a custom memory allocator to store parse nodes sequentially in large chunks
mp_parse_chunk_t *chunk = parser->cur_chunk;
if (chunk != NULL && chunk->union_.used + num_bytes > chunk->alloc) {
// not enough room at end of previously allocated chunk so try to grow
mp_parse_chunk_t *new_data = (mp_parse_chunk_t*)m_renew_maybe(byte, chunk,
sizeof(mp_parse_chunk_t) + chunk->alloc,
sizeof(mp_parse_chunk_t) + chunk->alloc + num_bytes, false);
if (new_data == NULL) {
// could not grow existing memory; shrink it to fit previous
(void)m_renew(byte, chunk, sizeof(mp_parse_chunk_t) + chunk->alloc,
sizeof(mp_parse_chunk_t) + chunk->union_.used);
chunk->alloc = chunk->union_.used;
chunk->union_.next = parser->tree.chunk;
parser->tree.chunk = chunk;
chunk = NULL;
} else {
// could grow existing memory
chunk->alloc += num_bytes;
}
}
if (chunk == NULL) {
// no previous chunk, allocate a new chunk
size_t alloc = MICROPY_ALLOC_PARSE_CHUNK_INIT;
if (alloc < num_bytes) {
alloc = num_bytes;
}
chunk = (mp_parse_chunk_t*)m_new(byte, sizeof(mp_parse_chunk_t) + alloc);
chunk->alloc = alloc;
chunk->union_.used = 0;
parser->cur_chunk = chunk;
}
byte *ret = chunk->data + chunk->union_.used;
chunk->union_.used += num_bytes;
return ret;
}
STATIC void push_rule(parser_t *parser, mp_uint_t src_line, const rule_t *rule, mp_uint_t arg_i) {
if (parser->had_memory_error) {
return;
@ -171,31 +224,6 @@ mp_parse_node_t mp_parse_node_new_leaf(mp_int_t kind, mp_int_t arg) {
return (mp_parse_node_t)(kind | (arg << 4));
}
void mp_parse_node_free(mp_parse_node_t pn) {
if (MP_PARSE_NODE_IS_STRUCT(pn)) {
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t *)pn;
mp_uint_t n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
mp_uint_t rule_id = MP_PARSE_NODE_STRUCT_KIND(pns);
if (rule_id == RULE_string || rule_id == RULE_bytes) {
m_del(char, (char*)pns->nodes[0], (mp_uint_t)pns->nodes[1]);
} else if (rule_id == RULE_const_object) {
// don't free the const object since it's probably used by the compiled code
} else {
bool adjust = ADD_BLANK_NODE(rules[rule_id]);
if (adjust) {
n--;
}
for (mp_uint_t i = 0; i < n; i++) {
mp_parse_node_free(pns->nodes[i]);
}
if (adjust) {
n++;
}
}
m_del_var(mp_parse_node_struct_t, mp_parse_node_t, n, pns);
}
}
int mp_parse_node_extract_list(mp_parse_node_t *pn, mp_uint_t pn_kind, mp_parse_node_t **nodes) {
if (MP_PARSE_NODE_IS_NULL(*pn)) {
*nodes = NULL;
@ -305,7 +333,7 @@ STATIC void push_result_node(parser_t *parser, mp_parse_node_t pn) {
}
STATIC mp_parse_node_t make_node_string_bytes(parser_t *parser, mp_uint_t src_line, mp_uint_t rule_kind, const char *str, mp_uint_t len) {
mp_parse_node_struct_t *pn = m_new_obj_var_maybe(mp_parse_node_struct_t, mp_parse_node_t, 2);
mp_parse_node_struct_t *pn = parser_alloc(parser, sizeof(mp_parse_node_struct_t) + sizeof(mp_parse_node_t) * 2);
if (pn == NULL) {
memory_error(parser);
return MP_PARSE_NODE_NULL;
@ -320,7 +348,7 @@ STATIC mp_parse_node_t make_node_string_bytes(parser_t *parser, mp_uint_t src_li
}
STATIC mp_parse_node_t make_node_const_object(parser_t *parser, mp_uint_t src_line, mp_obj_t obj) {
mp_parse_node_struct_t *pn = m_new_obj_var_maybe(mp_parse_node_struct_t, mp_parse_node_t, 1);
mp_parse_node_struct_t *pn = parser_alloc(parser, sizeof(mp_parse_node_struct_t) + sizeof(mp_parse_node_t));
if (pn == NULL) {
memory_error(parser);
return MP_PARSE_NODE_NULL;
@ -371,7 +399,7 @@ STATIC void push_result_token(parser_t *parser) {
}
STATIC void push_result_rule(parser_t *parser, mp_uint_t src_line, const rule_t *rule, mp_uint_t num_args) {
mp_parse_node_struct_t *pn = m_new_obj_var_maybe(mp_parse_node_struct_t, mp_parse_node_t, num_args);
mp_parse_node_struct_t *pn = parser_alloc(parser, sizeof(mp_parse_node_struct_t) + sizeof(mp_parse_node_t) * num_args);
if (pn == NULL) {
memory_error(parser);
return;
@ -384,7 +412,7 @@ STATIC void push_result_rule(parser_t *parser, mp_uint_t src_line, const rule_t
push_result_node(parser, (mp_parse_node_t)pn);
}
mp_parse_node_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
// initialise parser and allocate memory for its stacks
@ -402,6 +430,9 @@ mp_parse_node_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
parser.lexer = lex;
parser.tree.chunk = NULL;
parser.cur_chunk = NULL;
// check if we could allocate the stacks
if (parser.rule_stack == NULL || parser.result_stack == NULL) {
goto memory_error;
@ -554,7 +585,13 @@ mp_parse_node_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
mp_parse_node_t p = peek_result(&parser, 1);
if ((MP_PARSE_NODE_IS_LEAF(p) && !MP_PARSE_NODE_IS_ID(p)) || MP_PARSE_NODE_IS_STRUCT_KIND(p, RULE_string)) {
pop_result(&parser); // MP_PARSE_NODE_NULL
mp_parse_node_free(pop_result(&parser)); // RULE_string
mp_parse_node_t pn = pop_result(&parser); // possibly RULE_string
if (MP_PARSE_NODE_IS_STRUCT(pn)) {
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t *)pn;
if (MP_PARSE_NODE_STRUCT_KIND(pns) == RULE_string) {
m_del(char, (char*)pns->nodes[0], (mp_uint_t)pns->nodes[1]);
}
}
push_result_rule(&parser, rule_src_line, rules[RULE_pass_stmt], 0);
break;
}
@ -703,15 +740,24 @@ mp_parse_node_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
}
}
// truncate final chunk and link into chain of chunks
if (parser.cur_chunk != NULL) {
(void)m_renew(byte, parser.cur_chunk,
sizeof(mp_parse_chunk_t) + parser.cur_chunk->alloc,
sizeof(mp_parse_chunk_t) + parser.cur_chunk->union_.used);
parser.cur_chunk->alloc = parser.cur_chunk->union_.used;
parser.cur_chunk->union_.next = parser.tree.chunk;
parser.tree.chunk = parser.cur_chunk;
}
mp_obj_t exc;
mp_parse_node_t result;
// check if we had a memory error
if (parser.had_memory_error) {
memory_error:
exc = mp_obj_new_exception_msg(&mp_type_MemoryError,
"parser could not allocate enough memory");
result = MP_PARSE_NODE_NULL;
parser.tree.root = MP_PARSE_NODE_NULL;
goto finished;
}
@ -733,7 +779,7 @@ memory_error:
// get the root parse node that we created
assert(parser.result_stack_top == 1);
exc = MP_OBJ_NULL;
result = parser.result_stack[0];
parser.tree.root = parser.result_stack[0];
finished:
// free the memory that we don't need anymore
@ -750,7 +796,7 @@ finished:
nlr_raise(exc);
} else {
mp_lexer_free(lex);
return result;
return parser.tree;
}
syntax_error:
@ -771,6 +817,15 @@ syntax_error:
#endif
#endif
}
result = MP_PARSE_NODE_NULL;
parser.tree.root = MP_PARSE_NODE_NULL;
goto finished;
}
void mp_parse_tree_clear(mp_parse_tree_t *tree) {
mp_parse_chunk_t *chunk = tree->chunk;
while (chunk != NULL) {
mp_parse_chunk_t *next = chunk->union_.next;
m_del(byte, chunk, sizeof(mp_parse_chunk_t) + chunk->alloc);
chunk = next;
}
}

9
py/parse.h
View File

@ -76,7 +76,6 @@ typedef struct _mp_parse_node_struct_t {
#define MP_PARSE_NODE_STRUCT_NUM_NODES(pns) ((pns)->kind_num_nodes >> 8)
mp_parse_node_t mp_parse_node_new_leaf(mp_int_t kind, mp_int_t arg);
void mp_parse_node_free(mp_parse_node_t pn);
int mp_parse_node_extract_list(mp_parse_node_t *pn, mp_uint_t pn_kind, mp_parse_node_t **nodes);
void mp_parse_node_print(mp_parse_node_t pn, mp_uint_t indent);
@ -86,8 +85,14 @@ typedef enum {
MP_PARSE_EVAL_INPUT,
} mp_parse_input_kind_t;
typedef struct _mp_parse_t {
mp_parse_node_t root;
struct _mp_parse_chunk_t *chunk;
} mp_parse_tree_t;
// the parser will raise an exception if an error occurred
// the parser will free the lexer before it returns
mp_parse_node_t mp_parse(struct _mp_lexer_t *lex, mp_parse_input_kind_t input_kind);
mp_parse_tree_t mp_parse(struct _mp_lexer_t *lex, mp_parse_input_kind_t input_kind);
void mp_parse_tree_clear(mp_parse_tree_t *tree);
#endif // __MICROPY_INCLUDED_PY_PARSE_H__

4
py/runtime.c
View File

@ -1308,8 +1308,8 @@ mp_obj_t mp_parse_compile_execute(mp_lexer_t *lex, mp_parse_input_kind_t parse_i
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
qstr source_name = lex->source_name;
mp_parse_node_t pn = mp_parse(lex, parse_input_kind);
mp_obj_t module_fun = mp_compile(pn, source_name, MP_EMIT_OPT_NONE, false);
mp_parse_tree_t parse_tree = mp_parse(lex, parse_input_kind);
mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, false);
mp_obj_t ret;
if (MICROPY_PY_BUILTINS_COMPILE && globals == NULL) {

4
qemu-arm/main.c
View File

@ -21,8 +21,8 @@ void do_str(const char *src, mp_parse_input_kind_t input_kind) {
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
qstr source_name = lex->source_name;
mp_parse_node_t pn = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(pn, source_name, MP_EMIT_OPT_NONE, true);
mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, true);
mp_call_function_0(module_fun);
nlr_pop();
} else {

4
qemu-arm/test_main.c
View File

@ -25,8 +25,8 @@ inline void do_str(const char *src) {
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
qstr source_name = lex->source_name;
mp_parse_node_t pn = mp_parse(lex, MP_PARSE_FILE_INPUT);
mp_obj_t module_fun = mp_compile(pn, source_name, MP_EMIT_OPT_NONE, true);
mp_parse_tree_t parse_tree = mp_parse(lex, MP_PARSE_FILE_INPUT);
mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, true);
mp_call_function_0(module_fun);
nlr_pop();
} else {

4
stmhal/pyexec.c
View File

@ -64,8 +64,8 @@ STATIC int parse_compile_execute(mp_lexer_t *lex, mp_parse_input_kind_t input_ki
if (nlr_push(&nlr) == 0) {
// parse and compile the script
qstr source_name = lex->source_name;
mp_parse_node_t pn = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(pn, source_name, MP_EMIT_OPT_NONE, exec_flags & EXEC_FLAG_IS_REPL);
mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, exec_flags & EXEC_FLAG_IS_REPL);
// execute code
mp_hal_set_interrupt_char(CHAR_CTRL_C); // allow ctrl-C to interrupt us

6
unix/main.c
View File

@ -108,15 +108,15 @@ STATIC int execute_from_lexer(mp_lexer_t *lex, mp_parse_input_kind_t input_kind,
}
#endif
mp_parse_node_t pn = mp_parse(lex, input_kind);
mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
/*
printf("----------------\n");
mp_parse_node_print(pn, 0);
mp_parse_node_print(parse_tree.root, 0);
printf("----------------\n");
*/
mp_obj_t module_fun = mp_compile(pn, source_name, emit_opt, is_repl);
mp_obj_t module_fun = mp_compile(&parse_tree, source_name, emit_opt, is_repl);
if (!compile_only) {
// execute it