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src: create per-isolate strings after platform setup
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Allocation of strings may cause a garbage collection that uses
the platform to post tasks.

PR-URL: #20175
Fixes: #20171
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Yang Guo <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
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ulan authored and rvagg committed Aug 16, 2018
1 parent bf09b7a commit e17f05a
Showing 1 changed file with 34 additions and 32 deletions.
66 changes: 34 additions & 32 deletions src/env.cc
Original file line number Diff line number Diff line change
Expand Up @@ -30,44 +30,46 @@ IsolateData::IsolateData(Isolate* isolate,
uv_loop_t* event_loop,
MultiIsolatePlatform* platform,
uint32_t* zero_fill_field) :

// Create string and private symbol properties as internalized one byte strings.
//
// Internalized because it makes property lookups a little faster and because
// the string is created in the old space straight away. It's going to end up
// in the old space sooner or later anyway but now it doesn't go through
// v8::Eternal's new space handling first.
//
// One byte because our strings are ASCII and we can safely skip V8's UTF-8
// decoding step. It's a one-time cost, but why pay it when you don't have to?
#define V(PropertyName, StringValue) \
PropertyName ## _( \
isolate, \
Private::New( \
isolate, \
String::NewFromOneByte( \
isolate, \
reinterpret_cast<const uint8_t*>(StringValue), \
v8::NewStringType::kInternalized, \
sizeof(StringValue) - 1).ToLocalChecked())),
PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(V)
#undef V
#define V(PropertyName, StringValue) \
PropertyName ## _( \
isolate, \
String::NewFromOneByte( \
isolate, \
reinterpret_cast<const uint8_t*>(StringValue), \
v8::NewStringType::kInternalized, \
sizeof(StringValue) - 1).ToLocalChecked()),
PER_ISOLATE_STRING_PROPERTIES(V)
#undef V
isolate_(isolate),
event_loop_(event_loop),
zero_fill_field_(zero_fill_field),
platform_(platform) {
if (platform_ != nullptr)
platform_->RegisterIsolate(this, event_loop);

// Create string and private symbol properties as internalized one byte
// strings after the platform is properly initialized.
//
// Internalized because it makes property lookups a little faster and
// because the string is created in the old space straight away. It's going
// to end up in the old space sooner or later anyway but now it doesn't go
// through v8::Eternal's new space handling first.
//
// One byte because our strings are ASCII and we can safely skip V8's UTF-8
// decoding step.

#define V(PropertyName, StringValue) \
PropertyName ## _.Set( \
isolate, \
Private::New( \
isolate, \
String::NewFromOneByte( \
isolate, \
reinterpret_cast<const uint8_t*>(StringValue), \
v8::NewStringType::kInternalized, \
sizeof(StringValue) - 1).ToLocalChecked()));
PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(V)
#undef V
#define V(PropertyName, StringValue) \
PropertyName ## _.Set( \
isolate, \
String::NewFromOneByte( \
isolate, \
reinterpret_cast<const uint8_t*>(StringValue), \
v8::NewStringType::kInternalized, \
sizeof(StringValue) - 1).ToLocalChecked());
PER_ISOLATE_STRING_PROPERTIES(V)
#undef V
}

IsolateData::~IsolateData() {
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