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deps: V8: Backport of 0dd3390 from upstream
Original commit message: Reland "[builtins] Add %IsTraceCategoryEnabled and %Trace builtins" This is a reland of 8d4572a Original change's description: > [builtins] Add %IsTraceCategoryEnabled and %Trace builtins > > Adds the builtin Trace and IsTraceCategoryEnabled functions > exposed via extra bindings. These are intended to use by > embedders to allow basic trace event support from JavaScript. > > ```js > isTraceCategoryEnabled('v8.some-category') > > trace('e'.charCodeAt(0), 'v8.some-category', > 'Foo', 0, { abc: 'xyz'}) > ``` > > Bug: v8:7851 > Change-Id: I7bfb9bb059efdf87d92a56a0aae326650730c250 > Reviewed-on: chromium-review.googlesource.com/1103294 > Commit-Queue: Yang Guo <[email protected]> > Reviewed-by: Yang Guo <[email protected]> > Reviewed-by: Fadi Meawad <[email protected]> > Reviewed-by: Camillo Bruni <[email protected]> > Reviewed-by: Benedikt Meurer <[email protected]> > Cr-Commit-Position: refs/heads/master@{#54121} [email protected] Bug: v8:7851 Change-Id: Id063754b2834b3b6a2b2654e76e8637bcd6aa5f8 Reviewed-on: chromium-review.googlesource.com/1137071 Commit-Queue: Yang Guo <[email protected]> Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Camillo Bruni <[email protected]> Reviewed-by: Benedikt Meurer <[email protected]> Cr-Commit-Position: refs/heads/master@{#54532} Backport-PR-URL: #21668 PR-URL: #21899 Reviewed-By: Ali Ijaz Sheikh <[email protected]>
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Original file line number | Diff line number | Diff line change |
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@@ -86,6 +86,7 @@ Jan de Mooij <[email protected]> | |
Jan Krems <[email protected]> | ||
Jay Freeman <[email protected]> | ||
James Pike <[email protected]> | ||
James M Snell <[email protected]> | ||
Jianghua Yang <[email protected]> | ||
Joel Stanley <[email protected]> | ||
Johan Bergström <[email protected]> | ||
|
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,191 @@ | ||
// Copyright 2018 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. | ||
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#include "src/api.h" | ||
#include "src/builtins/builtins-utils.h" | ||
#include "src/builtins/builtins.h" | ||
#include "src/counters.h" | ||
#include "src/json-stringifier.h" | ||
#include "src/objects-inl.h" | ||
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namespace v8 { | ||
namespace internal { | ||
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namespace { | ||
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using v8::tracing::TracedValue; | ||
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#define MAX_STACK_LENGTH 100 | ||
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class MaybeUtf8 { | ||
public: | ||
explicit MaybeUtf8(Isolate* isolate, Handle<String> string) : buf_(data_) { | ||
string = String::Flatten(string); | ||
int len; | ||
if (string->IsOneByteRepresentation()) { | ||
// Technically this allows unescaped latin1 characters but the trace | ||
// events mechanism currently does the same and the current consuming | ||
// tools are tolerant of it. A more correct approach here would be to | ||
// escape non-ascii characters but this is easier and faster. | ||
len = string->length(); | ||
AllocateSufficientSpace(len); | ||
if (len > 0) { | ||
// Why copy? Well, the trace event mechanism requires null-terminated | ||
// strings, the bytes we get from SeqOneByteString are not. buf_ is | ||
// guaranteed to be null terminated. | ||
memcpy(buf_, Handle<SeqOneByteString>::cast(string)->GetChars(), len); | ||
} | ||
} else { | ||
Local<v8::String> local = Utils::ToLocal(string); | ||
len = local->Utf8Length(); | ||
AllocateSufficientSpace(len); | ||
if (len > 0) { | ||
local->WriteUtf8(reinterpret_cast<char*>(buf_)); | ||
} | ||
} | ||
buf_[len] = 0; | ||
} | ||
const char* operator*() const { return reinterpret_cast<const char*>(buf_); } | ||
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private: | ||
void AllocateSufficientSpace(int len) { | ||
if (len + 1 > MAX_STACK_LENGTH) { | ||
allocated_.reset(new uint8_t[len + 1]); | ||
buf_ = allocated_.get(); | ||
} | ||
} | ||
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// In the most common cases, the buffer here will be stack allocated. | ||
// A heap allocation will only occur if the data is more than MAX_STACK_LENGTH | ||
// Given that this is used primarily for trace event categories and names, | ||
// the MAX_STACK_LENGTH should be more than enough. | ||
uint8_t* buf_; | ||
uint8_t data_[MAX_STACK_LENGTH]; | ||
std::unique_ptr<uint8_t> allocated_; | ||
}; | ||
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class JsonTraceValue : public ConvertableToTraceFormat { | ||
public: | ||
explicit JsonTraceValue(Isolate* isolate, Handle<String> object) { | ||
// object is a JSON string serialized using JSON.stringify() from within | ||
// the BUILTIN(Trace) method. This may (likely) contain UTF8 values so | ||
// to grab the appropriate buffer data we have to serialize it out. We | ||
// hold on to the bits until the AppendAsTraceFormat method is called. | ||
MaybeUtf8 data(isolate, object); | ||
data_ = *data; | ||
} | ||
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void AppendAsTraceFormat(std::string* out) const override { *out += data_; } | ||
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private: | ||
std::string data_; | ||
}; | ||
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const uint8_t* GetCategoryGroupEnabled(Isolate* isolate, | ||
Handle<String> string) { | ||
MaybeUtf8 category(isolate, string); | ||
return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(*category); | ||
} | ||
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#undef MAX_STACK_LENGTH | ||
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} // namespace | ||
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// Builins::kIsTraceCategoryEnabled(category) : bool | ||
BUILTIN(IsTraceCategoryEnabled) { | ||
HandleScope scope(isolate); | ||
Handle<Object> category = args.atOrUndefined(isolate, 1); | ||
if (!category->IsString()) { | ||
THROW_NEW_ERROR_RETURN_FAILURE( | ||
isolate, NewTypeError(MessageTemplate::kTraceEventCategoryError)); | ||
} | ||
return isolate->heap()->ToBoolean( | ||
*GetCategoryGroupEnabled(isolate, Handle<String>::cast(category))); | ||
} | ||
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// Builtins::kTrace(phase, category, name, id, data) : bool | ||
BUILTIN(Trace) { | ||
HandleScope handle_scope(isolate); | ||
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Handle<Object> phase_arg = args.atOrUndefined(isolate, 1); | ||
Handle<Object> category = args.atOrUndefined(isolate, 2); | ||
Handle<Object> name_arg = args.atOrUndefined(isolate, 3); | ||
Handle<Object> id_arg = args.atOrUndefined(isolate, 4); | ||
Handle<Object> data_arg = args.atOrUndefined(isolate, 5); | ||
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const uint8_t* category_group_enabled = | ||
GetCategoryGroupEnabled(isolate, Handle<String>::cast(category)); | ||
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// Exit early if the category group is not enabled. | ||
if (!*category_group_enabled) { | ||
return isolate->heap()->false_value(); | ||
} | ||
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if (!phase_arg->IsNumber()) { | ||
THROW_NEW_ERROR_RETURN_FAILURE( | ||
isolate, NewTypeError(MessageTemplate::kTraceEventPhaseError)); | ||
} | ||
if (!category->IsString()) { | ||
THROW_NEW_ERROR_RETURN_FAILURE( | ||
isolate, NewTypeError(MessageTemplate::kTraceEventCategoryError)); | ||
} | ||
if (!name_arg->IsString()) { | ||
THROW_NEW_ERROR_RETURN_FAILURE( | ||
isolate, NewTypeError(MessageTemplate::kTraceEventNameError)); | ||
} | ||
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uint32_t flags = TRACE_EVENT_FLAG_COPY; | ||
int32_t id = 0; | ||
if (!id_arg->IsNullOrUndefined(isolate)) { | ||
if (!id_arg->IsNumber()) { | ||
THROW_NEW_ERROR_RETURN_FAILURE( | ||
isolate, NewTypeError(MessageTemplate::kTraceEventIDError)); | ||
} | ||
flags |= TRACE_EVENT_FLAG_HAS_ID; | ||
id = DoubleToInt32(id_arg->Number()); | ||
} | ||
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Handle<String> name_str = Handle<String>::cast(name_arg); | ||
if (name_str->length() == 0) { | ||
THROW_NEW_ERROR_RETURN_FAILURE( | ||
isolate, NewTypeError(MessageTemplate::kTraceEventNameLengthError)); | ||
} | ||
MaybeUtf8 name(isolate, name_str); | ||
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// We support passing one additional trace event argument with the | ||
// name "data". Any JSON serializable value may be passed. | ||
static const char* arg_name = "data"; | ||
int32_t num_args = 0; | ||
uint8_t arg_type; | ||
uint64_t arg_value; | ||
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if (!data_arg->IsUndefined(isolate)) { | ||
// Serializes the data argument as a JSON string, which is then | ||
// copied into an object. This eliminates duplicated code but | ||
// could have perf costs. It is also subject to all the same | ||
// limitations as JSON.stringify() as it relates to circular | ||
// references and value limitations (e.g. BigInt is not supported). | ||
JsonStringifier stringifier(isolate); | ||
Handle<Object> result; | ||
ASSIGN_RETURN_FAILURE_ON_EXCEPTION( | ||
isolate, result, | ||
stringifier.Stringify(data_arg, isolate->factory()->undefined_value(), | ||
isolate->factory()->undefined_value())); | ||
std::unique_ptr<JsonTraceValue> traced_value; | ||
traced_value.reset( | ||
new JsonTraceValue(isolate, Handle<String>::cast(result))); | ||
tracing::SetTraceValue(std::move(traced_value), &arg_type, &arg_value); | ||
num_args++; | ||
} | ||
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TRACE_EVENT_API_ADD_TRACE_EVENT( | ||
static_cast<char>(DoubleToInt32(phase_arg->Number())), | ||
category_group_enabled, *name, tracing::kGlobalScope, id, tracing::kNoId, | ||
num_args, &arg_name, &arg_type, &arg_value, flags); | ||
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return isolate->heap()->true_value(); | ||
} | ||
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} // namespace internal | ||
} // namespace v8 |
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