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dump_profile

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John Alanbrook
2025-12-28 21:53:12 -06:00
parent c388fb311b
commit 4201be47ee
1 changed files with 308 additions and 2 deletions
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306
source/quickjs.c
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@@ -97,10 +97,58 @@
//#define DUMP_SHAPES /* dump shapes in JS_FreeContext */
//#define DUMP_READ_OBJECT
//#define DUMP_ROPE_REBALANCE
/* dump profiling statistics (counters and sampling) when freeing the runtime */
//#define DUMP_PROFILE
/* test the GC by forcing it before each object allocation */
//#define FORCE_GC_AT_MALLOC
#ifdef DUMP_PROFILE
/* Profiling data structures (defined early since they're embedded in JSRuntime/JSFunctionBytecode) */
/* Per-function profiling counters (cheap, always-on under DUMP_PROFILE) */
typedef struct JSFunctionProfile {
uint64_t entry_count; /* how many times this function was called */
uint64_t self_ticks; /* bytecode instructions executed in this function */
} JSFunctionProfile;
/* Per-callsite profiling counters */
typedef struct JSCallSite {
uint32_t pc_offset; /* bytecode offset of the call instruction */
uint64_t hit_count; /* how many times this callsite was executed */
} JSCallSite;
/* Per-property-access-site profiling counters */
typedef struct JSPropSite {
uint32_t pc_offset; /* bytecode offset of the get/put instruction */
JSAtom atom; /* property name/atom */
uint64_t hit_count; /* how many times this prop site was executed */
} JSPropSite;
/* Forward declare JSFunctionBytecode for JSProfileSample */
typedef struct JSFunctionBytecode JSFunctionBytecode;
/* Sampling profiler sample */
typedef struct JSProfileSample {
JSFunctionBytecode *func; /* function being executed */
uint32_t pc_offset; /* bytecode PC offset */
uint32_t callsite_id; /* callsite id if available */
} JSProfileSample;
#define MAX_PROFILE_SAMPLES 100000
/* Runtime-wide profiling state */
typedef struct JSProfileState {
/* Sampling profiler */
JSProfileSample *samples;
uint32_t sample_count;
uint32_t sample_capacity;
struct timeval last_sample_time;
uint32_t sample_interval_us; /* microseconds between samples (1000-5000) */
} JSProfileState;
#endif /* DUMP_PROFILE */
enum {
/* classid tag */ /* union usage | properties */
JS_CLASS_OBJECT = 1, /* must be first */
@@ -228,6 +276,10 @@ struct JSRuntime {
JSShape **shape_hash;
void *user_opaque;
JSContext *js;
#ifdef DUMP_PROFILE
JSProfileState profile;
#endif
};
struct JSClass {
@@ -492,6 +544,17 @@ typedef struct JSFunctionBytecode {
uint8_t *pc2line_buf;
char *source;
} debug;
#ifdef DUMP_PROFILE
/* Profiling data */
JSFunctionProfile profile;
JSCallSite *call_sites;
uint32_t call_site_count;
uint32_t call_site_capacity;
JSPropSite *prop_sites;
uint32_t prop_site_count;
uint32_t prop_site_capacity;
#endif
} JSFunctionBytecode;
typedef struct JSBoundFunction {
@@ -1195,6 +1258,19 @@ JSRuntime *JS_NewRuntime2(const JSMallocFunctions *mf, void *opaque)
rt->current_exception = JS_UNINITIALIZED;
#ifdef DUMP_PROFILE
/* Initialize profiling state */
memset(&rt->profile, 0, sizeof(rt->profile));
rt->profile.sample_capacity = MAX_PROFILE_SAMPLES;
rt->profile.samples = mf->js_malloc(&rt->malloc_state,
sizeof(JSProfileSample) * rt->profile.sample_capacity);
if (!rt->profile.samples) {
rt->profile.sample_capacity = 0;
}
rt->profile.sample_interval_us = 2000; /* 2ms default */
gettimeofday(&rt->profile.last_sample_time, NULL);
#endif
return rt;
fail:
JS_FreeRuntime(rt);
@@ -1554,6 +1630,109 @@ void JS_FreeRuntime(JSRuntime *rt)
}
#endif
#ifdef DUMP_PROFILE
/* Dump profiling statistics */
{
struct list_head *el;
JSGCObjectHeader *p;
uint32_t func_count = 0;
uint32_t total_funcs = 0;
printf("\n=== PROFILING STATISTICS ===\n\n");
/* Dump sampling profiler results */
if (rt->profile.sample_count > 0) {
printf("Sampling Profile (%u samples, interval=%uus):\n",
rt->profile.sample_count, rt->profile.sample_interval_us);
printf(" %-50s %10s %10s\n", "Function", "Samples", "Percent");
printf(" %s\n", "------------------------------------------------------------------------");
/* Count samples per function */
list_for_each(el, &rt->gc_obj_list) {
p = list_entry(el, JSGCObjectHeader, link);
if (p->gc_obj_type == JS_GC_OBJ_TYPE_FUNCTION_BYTECODE) {
JSFunctionBytecode *b = (JSFunctionBytecode *)p;
uint32_t sample_hits = 0;
uint32_t i;
for (i = 0; i < rt->profile.sample_count; i++) {
if (rt->profile.samples[i].func == b) {
sample_hits++;
}
}
if (sample_hits > 0) {
JSContext *ctx = b->realm ? b->realm : rt->js;
const char *fname = ctx ? JS_AtomToCString(ctx, b->func_name) : NULL;
double percent = (100.0 * sample_hits) / rt->profile.sample_count;
printf(" %-50s %10u %9.2f%%\n",
fname ? fname : "<anonymous>", sample_hits, percent);
if (fname && ctx) JS_FreeCString(ctx, fname);
}
}
}
printf("\n");
}
/* Dump function counters */
printf("Function Statistics:\n");
printf(" %-50s %12s %15s\n", "Function", "Calls", "Instructions");
printf(" %s\n", "------------------------------------------------------------------------");
list_for_each(el, &rt->gc_obj_list) {
p = list_entry(el, JSGCObjectHeader, link);
if (p->gc_obj_type == JS_GC_OBJ_TYPE_FUNCTION_BYTECODE) {
JSFunctionBytecode *b = (JSFunctionBytecode *)p;
total_funcs++;
if (b->profile.entry_count > 0 || b->profile.self_ticks > 0) {
JSContext *ctx = b->realm ? b->realm : rt->js;
const char *fname = ctx ? JS_AtomToCString(ctx, b->func_name) : NULL;
printf(" %-50s %12llu %15llu\n",
fname ? fname : "<anonymous>",
(unsigned long long)b->profile.entry_count,
(unsigned long long)b->profile.self_ticks);
if (fname && ctx) JS_FreeCString(ctx, fname);
func_count++;
/* Dump hot callsites */
if (b->call_site_count > 0) {
uint32_t i;
printf(" Call sites:\n");
for (i = 0; i < b->call_site_count && i < 5; i++) {
printf(" PC %6u: %10llu calls\n",
b->call_sites[i].pc_offset,
(unsigned long long)b->call_sites[i].hit_count);
}
}
/* Dump hot property sites */
if (b->prop_site_count > 0) {
uint32_t i;
printf(" Property sites:\n");
for (i = 0; i < b->prop_site_count && i < 5; i++) {
JSContext *pctx = b->realm ? b->realm : rt->js;
const char *pname = pctx ? JS_AtomToCString(pctx, b->prop_sites[i].atom) : NULL;
printf(" PC %6u %-20s: %10llu accesses\n",
b->prop_sites[i].pc_offset,
pname ? pname : "<unknown>",
(unsigned long long)b->prop_sites[i].hit_count);
if (pname && pctx) JS_FreeCString(pctx, pname);
}
}
}
}
}
if (func_count == 0) {
printf(" (no functions executed) [%u total functions found]\n", total_funcs);
}
printf("\n");
/* Free profiling data */
js_free_rt(rt, rt->profile.samples);
}
#endif
{
JSMallocState ms = rt->malloc_state;
rt->mf.js_free(&ms, rt);
@@ -12398,6 +12577,79 @@ typedef enum {
} OPSpecialObjectEnum;
/* argv[] is modified if (flags & JS_CALL_FLAG_COPY_ARGV) = 0. */
#ifdef DUMP_PROFILE
/* Sampling profiler: try to take a sample */
static void profile_try_sample(JSRuntime *rt, JSFunctionBytecode *b, const uint8_t *pc)
{
struct timeval now;
long elapsed_us;
gettimeofday(&now, NULL);
elapsed_us = (now.tv_sec - rt->profile.last_sample_time.tv_sec) * 1000000L +
(now.tv_usec - rt->profile.last_sample_time.tv_usec);
/* Only sample if enough time has elapsed */
if (elapsed_us >= rt->profile.sample_interval_us) {
if (rt->profile.sample_count < rt->profile.sample_capacity) {
JSProfileSample *sample = &rt->profile.samples[rt->profile.sample_count++];
sample->func = b;
sample->pc_offset = (uint32_t)(pc - b->byte_code_buf);
sample->callsite_id = 0; /* Could be enhanced to track callsite */
}
rt->profile.last_sample_time = now;
}
}
/* Helper function to record a call site */
static void profile_record_call_site(JSRuntime *rt, JSFunctionBytecode *b, uint32_t pc_offset)
{
uint32_t i;
/* Check if we already have this callsite */
for (i = 0; i < b->call_site_count; i++) {
if (b->call_sites[i].pc_offset == pc_offset) {
b->call_sites[i].hit_count++;
return;
}
}
/* Add new callsite */
if (b->call_site_count >= b->call_site_capacity) {
uint32_t new_cap = b->call_site_capacity ? b->call_site_capacity * 2 : 16;
JSCallSite *new_sites = js_realloc_rt(rt, b->call_sites, new_cap * sizeof(JSCallSite));
if (!new_sites) return;
b->call_sites = new_sites;
b->call_site_capacity = new_cap;
}
b->call_sites[b->call_site_count].pc_offset = pc_offset;
b->call_sites[b->call_site_count].hit_count = 1;
b->call_site_count++;
}
/* Helper function to record a property access site */
static void profile_record_prop_site(JSRuntime *rt, JSFunctionBytecode *b, uint32_t pc_offset, JSAtom atom)
{
uint32_t i;
/* Check if we already have this prop site */
for (i = 0; i < b->prop_site_count; i++) {
if (b->prop_sites[i].pc_offset == pc_offset && b->prop_sites[i].atom == atom) {
b->prop_sites[i].hit_count++;
return;
}
}
/* Add new prop site */
if (b->prop_site_count >= b->prop_site_capacity) {
uint32_t new_cap = b->prop_site_capacity ? b->prop_site_capacity * 2 : 16;
JSPropSite *new_sites = js_realloc_rt(rt, b->prop_sites, new_cap * sizeof(JSPropSite));
if (!new_sites) return;
b->prop_sites = new_sites;
b->prop_site_capacity = new_cap;
}
b->prop_sites[b->prop_site_count].pc_offset = pc_offset;
b->prop_sites[b->prop_site_count].atom = atom;
b->prop_sites[b->prop_site_count].hit_count = 1;
b->prop_site_count++;
}
#endif
static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
JSValueConst this_obj, JSValueConst new_target,
int argc, JSValue *argv, int flags)
@@ -12453,6 +12705,11 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
}
b = p->u.func.function_bytecode;
#ifdef DUMP_PROFILE
/* Increment function entry count */
b->profile.entry_count++;
#endif
if (unlikely(caller_ctx->trace_hook) && (caller_ctx->trace_type & JS_HOOK_CALL)) {
js_debug dbg = {0};
js_debug_info(caller_ctx, func_obj, &dbg);
@@ -12507,6 +12764,14 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
int call_argc;
JSValue *call_argv;
#ifdef DUMP_PROFILE
/* Count bytecode instructions executed (self_ticks) */
b->profile.self_ticks++;
/* Try to take a profiling sample */
profile_try_sample(rt, b, pc);
#endif
SWITCH(pc) {
CASE(OP_push_i32):
*sp++ = JS_NewInt32(ctx, get_u32(pc));
@@ -12783,6 +13048,10 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
has_call_argc:
call_argv = sp - call_argc;
sf->cur_pc = pc;
#ifdef DUMP_PROFILE
/* Record call site */
profile_record_call_site(rt, b, (uint32_t)(pc - b->byte_code_buf));
#endif
ret_val = JS_CallInternal(ctx, call_argv[-1], JS_NULL,
JS_NULL, call_argc, call_argv, 0);
if (unlikely(JS_IsException(ret_val)))
@@ -12801,6 +13070,10 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
pc += 2;
call_argv = sp - call_argc;
sf->cur_pc = pc;
#ifdef DUMP_PROFILE
/* Record call site */
profile_record_call_site(rt, b, (uint32_t)(pc - b->byte_code_buf));
#endif
ret_val = JS_CallConstructorInternal(ctx, call_argv[-2],
call_argv[-1],
call_argc, call_argv, 0);
@@ -12819,6 +13092,10 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
pc += 2;
call_argv = sp - call_argc;
sf->cur_pc = pc;
#ifdef DUMP_PROFILE
/* Record call site */
profile_record_call_site(rt, b, (uint32_t)(pc - b->byte_code_buf));
#endif
ret_val = JS_CallInternal(ctx, call_argv[-1], call_argv[-2],
JS_NULL, call_argc, call_argv, 0);
if (unlikely(JS_IsException(ret_val)))
@@ -13646,6 +13923,10 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
pc += 4;
sf->cur_pc = pc;
#ifdef DUMP_PROFILE
/* Record property access site */
profile_record_prop_site(rt, b, (uint32_t)(pc - b->byte_code_buf), atom);
#endif
val = JS_GetProperty(ctx, sp[-1], atom);
if (unlikely(JS_IsException(val)))
goto exception;
@@ -13662,6 +13943,10 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
pc += 4;
sf->cur_pc = pc;
#ifdef DUMP_PROFILE
/* Record property access site */
profile_record_prop_site(rt, b, (uint32_t)(pc - b->byte_code_buf), atom);
#endif
val = JS_GetProperty(ctx, sp[-1], atom);
if (unlikely(JS_IsException(val)))
goto exception;
@@ -13677,6 +13962,10 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
pc += 4;
sf->cur_pc = pc;
#ifdef DUMP_PROFILE
/* Record property access site */
profile_record_prop_site(rt, b, (uint32_t)(pc - b->byte_code_buf), atom);
#endif
ret = JS_SetPropertyInternal(ctx, sp[-2], atom, sp[-1], sp[-2],
JS_PROP_THROW_STRICT);
JS_FreeValue(ctx, sp[-2]);
@@ -24730,6 +25019,17 @@ static JSValue js_create_function(JSContext *ctx, JSFunctionDef *fd)
b->has_simple_parameter_list = fd->has_simple_parameter_list;
b->js_mode = fd->js_mode;
b->is_derived_class_constructor = fd->is_derived_class_constructor;
#ifdef DUMP_PROFILE
/* Initialize profiling data */
memset(&b->profile, 0, sizeof(b->profile));
b->call_sites = NULL;
b->call_site_count = 0;
b->call_site_capacity = 0;
b->prop_sites = NULL;
b->prop_site_count = 0;
b->prop_site_capacity = 0;
#endif
b->new_target_allowed = fd->new_target_allowed;
b->is_direct_or_indirect_eval = (fd->eval_type == JS_EVAL_TYPE_DIRECT ||
fd->eval_type == JS_EVAL_TYPE_INDIRECT);
@@ -24783,6 +25083,12 @@ static void free_function_bytecode(JSRuntime *rt, JSFunctionBytecode *b)
js_free_rt(rt, b->debug.source);
}
#ifdef DUMP_PROFILE
/* Free profiling data */
js_free_rt(rt, b->call_sites);
js_free_rt(rt, b->prop_sites);
#endif
remove_gc_object(&b->header);
if (rt->gc_phase == JS_GC_PHASE_REMOVE_CYCLES && b->header.ref_count != 0) {
list_add_tail(&b->header.link, &rt->gc_zero_ref_count_list);