esp-idf/components/heap/heap_trace.c

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include <sys/param.h>
#include <sdkconfig.h>
#define HEAP_TRACE_SRCFILE /* don't warn on inclusion here */
#include "esp_heap_trace.h"
#undef HEAP_TRACE_SRCFILE
#include "esp_heap_caps.h"
#include "esp_attr.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "soc/soc_memory_layout.h"
#include "heap_private.h"
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#define STACK_DEPTH CONFIG_HEAP_TRACING_STACK_DEPTH
static portMUX_TYPE trace_mux = portMUX_INITIALIZER_UNLOCKED;
static bool tracing;
static heap_trace_mode_t mode;
/* Buffer used for records, starting at offset 0
*/
static heap_trace_record_t *buffer;
static size_t total_records;
/* Count of entries logged in the buffer.
Maximum total_records
*/
static size_t count;
/* Actual number of allocations logged */
static size_t total_allocations;
/* Actual number of frees logged */
static size_t total_frees;
/* Has the buffer overflowed and lost trace entries? */
static bool has_overflowed = false;
esp_err_t heap_trace_init_standalone(heap_trace_record_t *record_buffer, size_t num_records)
{
#ifndef CONFIG_HEAP_TRACING
return ESP_ERR_NOT_SUPPORTED;
#endif
if (tracing) {
return ESP_ERR_INVALID_STATE;
}
buffer = record_buffer;
total_records = num_records;
memset(buffer, 0, num_records * sizeof(heap_trace_record_t));
return ESP_OK;
}
esp_err_t heap_trace_start(heap_trace_mode_t mode_param)
{
#ifndef CONFIG_HEAP_TRACING
return ESP_ERR_NOT_SUPPORTED;
#endif
if (buffer == NULL || total_records == 0) {
return ESP_ERR_INVALID_STATE;
}
portENTER_CRITICAL(&trace_mux);
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tracing = false;
mode = mode_param;
count = 0;
total_allocations = 0;
total_frees = 0;
has_overflowed = false;
heap_trace_resume();
portEXIT_CRITICAL(&trace_mux);
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return ESP_OK;
}
static esp_err_t set_tracing(bool enable)
{
#ifndef CONFIG_HEAP_TRACING
return ESP_ERR_NOT_SUPPORTED;
#endif
if (tracing == enable) {
return ESP_ERR_INVALID_STATE;
}
tracing = enable;
return ESP_OK;
}
esp_err_t heap_trace_stop(void)
{
return set_tracing(false);
}
esp_err_t heap_trace_resume(void)
{
return set_tracing(true);
}
size_t heap_trace_get_count(void)
{
return count;
}
esp_err_t heap_trace_get(size_t index, heap_trace_record_t *record)
{
#ifndef CONFIG_HEAP_TRACING
return ESP_ERR_NOT_SUPPORTED;
#endif
if (record == NULL) {
return ESP_ERR_INVALID_STATE;
}
esp_err_t result = ESP_OK;
portENTER_CRITICAL(&trace_mux);
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if (index >= count) {
result = ESP_ERR_INVALID_ARG; /* out of range for 'count' */
} else {
memcpy(record, &buffer[index], sizeof(heap_trace_record_t));
}
portEXIT_CRITICAL(&trace_mux);
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return result;
}
void heap_trace_dump(void)
{
#ifndef CONFIG_HEAP_TRACING
printf("no data, heap tracing is disabled.\n");
return;
#endif
size_t delta_size = 0;
size_t delta_allocs = 0;
printf("%u allocations trace (%u entry buffer)\n",
count, total_records);
size_t start_count = count;
for (int i = 0; i < count; i++) {
heap_trace_record_t *rec = &buffer[i];
if (rec->address != NULL) {
printf("%d bytes (@ %p) allocated CPU %d ccount 0x%08x caller ",
rec->size, rec->address, rec->ccount & 1, rec->ccount & ~3);
for (int j = 0; j < STACK_DEPTH && rec->alloced_by[j] != 0; j++) {
printf("%p%s", rec->alloced_by[j],
(j < STACK_DEPTH - 1) ? ":" : "");
}
if (mode != HEAP_TRACE_ALL || STACK_DEPTH == 0 || rec->freed_by[0] == NULL) {
delta_size += rec->size;
delta_allocs++;
printf("\n");
} else {
printf("\nfreed by ");
for (int j = 0; j < STACK_DEPTH; j++) {
printf("%p%s", rec->freed_by[j],
(j < STACK_DEPTH - 1) ? ":" : "\n");
}
}
}
}
if (mode == HEAP_TRACE_ALL) {
printf("%u bytes alive in trace (%u/%u allocations)\n",
delta_size, delta_allocs, heap_trace_get_count());
} else {
printf("%u bytes 'leaked' in trace (%u allocations)\n", delta_size, delta_allocs);
}
printf("total allocations %u total frees %u\n", total_allocations, total_frees);
if (start_count != count) { // only a problem if trace isn't stopped before dumping
printf("(NB: New entries were traced while dumping, so trace dump may have duplicate entries.)\n");
}
if (has_overflowed) {
printf("(NB: Buffer has overflowed, so trace data is incomplete.)\n");
}
}
/* Add a new allocation to the heap trace records */
static IRAM_ATTR void record_allocation(const heap_trace_record_t *record)
{
portENTER_CRITICAL(&trace_mux);
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if (tracing) {
if (count == total_records) {
has_overflowed = true;
/* Move the whole buffer back one slot.
This is a bit slow, compared to treating this buffer as a ringbuffer and rotating a head pointer.
However, ringbuffer code gets tricky when we remove elements in mid-buffer (for leak trace mode) while
trying to keep track of an item count that may overflow.
*/
memmove(&buffer[0], &buffer[1], sizeof(heap_trace_record_t) * (total_records -1));
count--;
}
// Copy new record into place
memcpy(&buffer[count], record, sizeof(heap_trace_record_t));
count++;
total_allocations++;
}
portEXIT_CRITICAL(&trace_mux);
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}
// remove a record, used when freeing
static void remove_record(int index);
/* record a free event in the heap trace log
For HEAP_TRACE_ALL, this means filling in the freed_by pointer.
For HEAP_TRACE_LEAKS, this means removing the record from the log.
*/
static IRAM_ATTR void record_free(void *p, void **callers)
{
portENTER_CRITICAL(&trace_mux);
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if (tracing && count > 0) {
total_frees++;
/* search backwards for the allocation record matching this free */
int i;
for (i = count - 1; i >= 0; i--) {
if (buffer[i].address == p) {
break;
}
}
if (i >= 0) {
if (mode == HEAP_TRACE_ALL) {
memcpy(buffer[i].freed_by, callers, sizeof(void *) * STACK_DEPTH);
} else { // HEAP_TRACE_LEAKS
// Leak trace mode, once an allocation is freed we remove it from the list
remove_record(i);
}
}
}
portEXIT_CRITICAL(&trace_mux);
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}
/* remove the entry at 'index' from the ringbuffer of saved records */
static IRAM_ATTR void remove_record(int index)
{
if (index < count - 1) {
// Remove the buffer entry from the list
memmove(&buffer[index], &buffer[index+1],
sizeof(heap_trace_record_t) * (total_records - index - 1));
} else {
// For last element, just zero it out to avoid ambiguity
memset(&buffer[index], 0, sizeof(heap_trace_record_t));
}
count--;
}
/* Encode the CPU ID in the LSB of the ccount value */
inline static uint32_t get_ccount(void)
{
uint32_t ccount = xthal_get_ccount() & ~3;
#ifndef CONFIG_FREERTOS_UNICORE
ccount |= xPortGetCoreID();
#endif
return ccount;
}
#define TEST_STACK(N) do { \
if (STACK_DEPTH == N) { \
return; \
} \
callers[N] = __builtin_return_address(N+offset); \
if (!esp_ptr_executable(callers[N])) { \
return; \
} \
} while(0);
/* Static function to read the call stack for a traced heap call.
Calls to __builtin_return_address are "unrolled" via TEST_STACK macro as gcc requires the
argument to be a compile-time constant.
*/
static IRAM_ATTR __attribute__((noinline)) void get_call_stack(void **callers)
{
const int offset = 2; // Caller is 2 stack frames deeper than we care about
bzero(callers, sizeof(void *) * STACK_DEPTH);
TEST_STACK(0);
TEST_STACK(1);
TEST_STACK(2);
TEST_STACK(3);
TEST_STACK(4);
TEST_STACK(5);
TEST_STACK(6);
TEST_STACK(7);
TEST_STACK(8);
TEST_STACK(9);
}
_Static_assert(STACK_DEPTH >= 0 && STACK_DEPTH <= 10, "CONFIG_HEAP_TRACING_STACK_DEPTH must be in range 0-10");
typedef enum {
TRACE_MALLOC_CAPS,
TRACE_MALLOC_DEFAULT
} trace_malloc_mode_t;
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void *__real_heap_caps_malloc(size_t size, uint32_t caps);
void *__real_heap_caps_malloc_default( size_t size );
void *__real_heap_caps_realloc_default( void *ptr, size_t size );
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/* trace any 'malloc' event */
static IRAM_ATTR __attribute__((noinline)) void *trace_malloc(size_t size, uint32_t caps, trace_malloc_mode_t mode)
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{
uint32_t ccount = get_ccount();
void *p;
if ( mode == TRACE_MALLOC_CAPS ) {
p = __real_heap_caps_malloc(size, caps);
} else { //TRACE_MALLOC_DEFAULT
p = __real_heap_caps_malloc_default(size);
}
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if (tracing && p != NULL) {
heap_trace_record_t rec = {
.address = p,
.ccount = ccount,
.size = size,
};
get_call_stack(rec.alloced_by);
record_allocation(&rec);
}
return p;
}
void __real_heap_caps_free(void *p);
/* trace any 'free' event */
static IRAM_ATTR __attribute__((noinline)) void trace_free(void *p)
{
if (tracing && p != NULL) {
void *callers[STACK_DEPTH];
get_call_stack(callers);
record_free(p, callers);
}
__real_heap_caps_free(p);
}
void * __real_heap_caps_realloc(void *p, size_t size, uint32_t caps);
/* trace any 'realloc' event */
static IRAM_ATTR __attribute__((noinline)) void *trace_realloc(void *p, size_t size, uint32_t caps, trace_malloc_mode_t mode)
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{
void *callers[STACK_DEPTH];
uint32_t ccount = get_ccount();
if (tracing && p != NULL && size == 0) {
get_call_stack(callers);
record_free(p, callers);
}
void *r;
if (mode == TRACE_MALLOC_CAPS ) {
r = __real_heap_caps_realloc(p, size, caps);
} else { //TRACE_MALLOC_DEFAULT
r = __real_heap_caps_realloc_default(p, size);
}
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if (tracing && r != NULL) {
get_call_stack(callers);
if (p != NULL) {
/* trace realloc as free-then-alloc */
record_free(p, callers);
}
heap_trace_record_t rec = {
.address = r,
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.ccount = ccount,
.size = size,
};
memcpy(rec.alloced_by, callers, sizeof(void *) * STACK_DEPTH);
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record_allocation(&rec);
}
return r;
}
/* Note: this changes the behaviour of libc malloc/realloc/free a bit,
as they no longer go via the libc functions in ROM. But more or less
the same in the end. */
IRAM_ATTR void *__wrap_malloc(size_t size)
{
return trace_malloc(size, 0, TRACE_MALLOC_DEFAULT);
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}
IRAM_ATTR void __wrap_free(void *p)
{
trace_free(p);
}
IRAM_ATTR void *__wrap_realloc(void *p, size_t size)
{
return trace_realloc(p, size, 0, TRACE_MALLOC_DEFAULT);
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}
IRAM_ATTR void *__wrap_calloc(size_t nmemb, size_t size)
{
size = size * nmemb;
void *result = trace_malloc(size, 0, TRACE_MALLOC_DEFAULT);
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if (result != NULL) {
memset(result, 0, size);
}
return result;
}
IRAM_ATTR void *__wrap_heap_caps_malloc(size_t size, uint32_t caps)
{
return trace_malloc(size, caps, TRACE_MALLOC_CAPS);
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}
IRAM_ATTR void __wrap_heap_caps_free(void *p) __attribute__((alias("__wrap_free")));
IRAM_ATTR void *__wrap_heap_caps_realloc(void *p, size_t size, uint32_t caps)
{
return trace_realloc(p, size, caps, TRACE_MALLOC_CAPS);
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}
IRAM_ATTR void *__wrap_heap_caps_malloc_default( size_t size )
{
return trace_malloc(size, 0, TRACE_MALLOC_DEFAULT);
}
IRAM_ATTR void *__wrap_heap_caps_realloc_default( void *ptr, size_t size )
{
return trace_realloc(ptr, size, 0, TRACE_MALLOC_DEFAULT);
}