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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/heap/code-stats.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
// Record code statisitcs.
void CodeStatistics::RecordCodeAndMetadataStatistics(HeapObject* object,
Isolate* isolate) {
if (!object->IsAbstractCode()) {
return;
}
// Record code+metadata statisitcs.
AbstractCode* abstract_code = AbstractCode::cast(object);
int size = abstract_code->SizeIncludingMetadata();
if (abstract_code->IsCode()) {
size += isolate->code_and_metadata_size();
isolate->set_code_and_metadata_size(size);
} else {
size += isolate->bytecode_and_metadata_size();
isolate->set_bytecode_and_metadata_size(size);
}
#ifdef DEBUG
// Record code kind and code comment statistics.
isolate->code_kind_statistics()[abstract_code->kind()] +=
abstract_code->Size();
CodeStatistics::CollectCodeCommentStatistics(object, isolate);
#endif
}
void CodeStatistics::ResetCodeAndMetadataStatistics(Isolate* isolate) {
isolate->set_code_and_metadata_size(0);
isolate->set_bytecode_and_metadata_size(0);
#ifdef DEBUG
ResetCodeStatistics(isolate);
#endif
}
// Collects code size statistics:
// - code and metadata size
// - by code kind (only in debug mode)
// - by code comment (only in debug mode)
void CodeStatistics::CollectCodeStatistics(PagedSpace* space,
Isolate* isolate) {
HeapObjectIterator obj_it(space);
for (HeapObject* obj = obj_it.Next(); obj != NULL; obj = obj_it.Next()) {
RecordCodeAndMetadataStatistics(obj, isolate);
}
}
// Collects code size statistics in LargeObjectSpace:
// - code and metadata size
// - by code kind (only in debug mode)
// - by code comment (only in debug mode)
void CodeStatistics::CollectCodeStatistics(LargeObjectSpace* space,
Isolate* isolate) {
LargeObjectIterator obj_it(space);
for (HeapObject* obj = obj_it.Next(); obj != NULL; obj = obj_it.Next()) {
RecordCodeAndMetadataStatistics(obj, isolate);
}
}
#ifdef DEBUG
void CodeStatistics::ReportCodeStatistics(Isolate* isolate) {
// Report code kind statistics
int* code_kind_statistics = isolate->code_kind_statistics();
PrintF("\n Code kind histograms: \n");
for (int i = 0; i < AbstractCode::NUMBER_OF_KINDS; i++) {
if (code_kind_statistics[i] > 0) {
PrintF(" %-20s: %10d bytes\n",
AbstractCode::Kind2String(static_cast<AbstractCode::Kind>(i)),
code_kind_statistics[i]);
}
}
PrintF("\n");
// Report code and metadata statisitcs
if (isolate->code_and_metadata_size() > 0) {
PrintF("Code size including metadata : %10d bytes\n",
isolate->code_and_metadata_size());
}
if (isolate->bytecode_and_metadata_size() > 0) {
PrintF("Bytecode size including metadata: %10d bytes\n",
isolate->bytecode_and_metadata_size());
}
// Report code comment statistics
CommentStatistic* comments_statistics =
isolate->paged_space_comments_statistics();
PrintF(
"Code comment statistics (\" [ comment-txt : size/ "
"count (average)\"):\n");
for (int i = 0; i <= CommentStatistic::kMaxComments; i++) {
const CommentStatistic& cs = comments_statistics[i];
if (cs.size > 0) {
PrintF(" %-30s: %10d/%6d (%d)\n", cs.comment, cs.size, cs.count,
cs.size / cs.count);
}
}
PrintF("\n");
}
void CodeStatistics::ResetCodeStatistics(Isolate* isolate) {
// Clear code kind statistics
int* code_kind_statistics = isolate->code_kind_statistics();
for (int i = 0; i < AbstractCode::NUMBER_OF_KINDS; i++) {
code_kind_statistics[i] = 0;
}
// Clear code comment statistics
CommentStatistic* comments_statistics =
isolate->paged_space_comments_statistics();
for (int i = 0; i < CommentStatistic::kMaxComments; i++) {
comments_statistics[i].Clear();
}
comments_statistics[CommentStatistic::kMaxComments].comment = "Unknown";
comments_statistics[CommentStatistic::kMaxComments].size = 0;
comments_statistics[CommentStatistic::kMaxComments].count = 0;
}
// Adds comment to 'comment_statistics' table. Performance OK as long as
// 'kMaxComments' is small
void CodeStatistics::EnterComment(Isolate* isolate, const char* comment,
int delta) {
CommentStatistic* comments_statistics =
isolate->paged_space_comments_statistics();
// Do not count empty comments
if (delta <= 0) return;
CommentStatistic* cs = &comments_statistics[CommentStatistic::kMaxComments];
// Search for a free or matching entry in 'comments_statistics': 'cs'
// points to result.
for (int i = 0; i < CommentStatistic::kMaxComments; i++) {
if (comments_statistics[i].comment == NULL) {
cs = &comments_statistics[i];
cs->comment = comment;
break;
} else if (strcmp(comments_statistics[i].comment, comment) == 0) {
cs = &comments_statistics[i];
break;
}
}
// Update entry for 'comment'
cs->size += delta;
cs->count += 1;
}
// Call for each nested comment start (start marked with '[ xxx', end marked
// with ']'. RelocIterator 'it' must point to a comment reloc info.
void CodeStatistics::CollectCommentStatistics(Isolate* isolate,
RelocIterator* it) {
DCHECK(!it->done());
DCHECK(it->rinfo()->rmode() == RelocInfo::COMMENT);
const char* tmp = reinterpret_cast<const char*>(it->rinfo()->data());
if (tmp[0] != '[') {
// Not a nested comment; skip
return;
}
// Search for end of nested comment or a new nested comment
const char* const comment_txt =
reinterpret_cast<const char*>(it->rinfo()->data());
const byte* prev_pc = it->rinfo()->pc();
int flat_delta = 0;
it->next();
while (true) {
// All nested comments must be terminated properly, and therefore exit
// from loop.
DCHECK(!it->done());
if (it->rinfo()->rmode() == RelocInfo::COMMENT) {
const char* const txt =
reinterpret_cast<const char*>(it->rinfo()->data());
flat_delta += static_cast<int>(it->rinfo()->pc() - prev_pc);
if (txt[0] == ']') break; // End of nested comment
// A new comment
CollectCommentStatistics(isolate, it);
// Skip code that was covered with previous comment
prev_pc = it->rinfo()->pc();
}
it->next();
}
EnterComment(isolate, comment_txt, flat_delta);
}
// Collects code comment statistics
void CodeStatistics::CollectCodeCommentStatistics(HeapObject* obj,
Isolate* isolate) {
// Bytecode objects do not contain RelocInfo. Only process code objects
// for code comment statistics.
if (!obj->IsCode()) {
return;
}
Code* code = Code::cast(obj);
RelocIterator it(code);
int delta = 0;
const byte* prev_pc = code->instruction_start();
while (!it.done()) {
if (it.rinfo()->rmode() == RelocInfo::COMMENT) {
delta += static_cast<int>(it.rinfo()->pc() - prev_pc);
CollectCommentStatistics(isolate, &it);
prev_pc = it.rinfo()->pc();
}
it.next();
}
DCHECK(code->instruction_start() <= prev_pc &&
prev_pc <= code->instruction_end());
delta += static_cast<int>(code->instruction_end() - prev_pc);
EnterComment(isolate, "NoComment", delta);
}
#endif
} // namespace internal
} // namespace v8
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