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src: internalize per-isolate string properties #3060

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bnoordhuis merged 2 commits into from
Sep 26, 2015
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src: internalize per-isolate string properties #3060

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src: internalize per-isolate string properties
bnoordhuis Sep 25, 2015
212c9c0
src: internalize binding function property names
bnoordhuis Sep 25, 2015
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src: internalize per-isolate string properties 
Speeds up property lookups a little and it creates the string in the
old space straight away.  It's a little easier on the garbage collector
because it doesn't have to track eternalized strings in the new space.

PR-URL: #3060
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
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@bnoordhuis
bnoordhuis committed Sep 26, 2015
commit 590ee58e1ce3008f5e11a169ceba867e8c567ae7
16 changes: 15 additions & 1 deletion src/env-inl.h
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Expand Up @@ -36,12 +36,26 @@ inline void Environment::IsolateData::Put() {
}
}

// Create string 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?
inline Environment::IsolateData::IsolateData(v8::Isolate* isolate,
uv_loop_t* loop)
: event_loop_(loop),
isolate_(isolate),
#define V(PropertyName, StringValue) \
PropertyName ## _(isolate, FIXED_ONE_BYTE_STRING(isolate, StringValue)),
PropertyName ## _(isolate, \
v8::String::NewFromOneByte( \
isolate, \
reinterpret_cast<const uint8_t*>(StringValue), \
v8::NewStringType::kInternalized, \
sizeof(StringValue) - 1).ToLocalChecked()),
PER_ISOLATE_STRING_PROPERTIES(V)
#undef V
ref_count_(0) {}
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2 changes: 1 addition & 1 deletion src/env.h
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Expand Up @@ -39,7 +39,7 @@ namespace node {
#endif

// Strings are per-isolate primitives but Environment proxies them
// for the sake of convenience.
// for the sake of convenience. Strings should be ASCII-only.
#define PER_ISOLATE_STRING_PROPERTIES(V) \
V(address_string, "address") \
V(args_string, "args") \
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