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src: add an ExternalReferenceRegistry class
Add an ExternalReferenceRegistry class for registering static external references. To register the external JS to C++ references created in a binding (e.g. when a FunctionTemplate is created): - Add the binding name (same as the id used for `internalBinding()` and `NODE_MODULE_CONTEXT_AWARE_INTERNAL`) to `EXTERNAL_REFERENCE_BINDING_LIST` in `src/node_external_reference.h`. - In the file where the binding is implemented, create a registration function to register the static C++ references (e.g. the C++ functions in `v8::FunctionCallback` associated with the function templates), like this: ```c++ void RegisterExternalReferences( ExternalReferenceRegistry* registry) { registry->Register(cpp_func_1); } ``` - At the end of the file where `NODE_MODULE_CONTEXT_AWARE_INTERNAL` is also usually called, register the registration function with ``` NODE_MODULE_EXTERNAL_REFERENCE(binding_name, RegisterExternalReferences); ``` PR-URL: #32984 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
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Original file line number | Diff line number | Diff line change |
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#include "node_external_reference.h" | ||
#include <cinttypes> | ||
#include <vector> | ||
#include "util.h" | ||
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namespace node { | ||
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const std::vector<intptr_t>& ExternalReferenceRegistry::external_references() { | ||
CHECK(!is_finalized_); | ||
external_references_.push_back(reinterpret_cast<intptr_t>(nullptr)); | ||
is_finalized_ = true; | ||
return external_references_; | ||
} | ||
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ExternalReferenceRegistry::ExternalReferenceRegistry() { | ||
#define V(modname) _register_external_reference_##modname(this); | ||
EXTERNAL_REFERENCE_BINDING_LIST(V) | ||
#undef V | ||
// TODO(joyeecheung): collect more external references here. | ||
} | ||
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} // namespace node |
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#ifndef SRC_NODE_EXTERNAL_REFERENCE_H_ | ||
#define SRC_NODE_EXTERNAL_REFERENCE_H_ | ||
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS | ||
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#include <cinttypes> | ||
#include <vector> | ||
#include "v8.h" | ||
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namespace node { | ||
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// This class manages the external references from the V8 heap | ||
// to the C++ addresses in Node.js. | ||
class ExternalReferenceRegistry { | ||
public: | ||
ExternalReferenceRegistry(); | ||
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#define ALLOWED_EXTERNAL_REFERENCE_TYPES(V) \ | ||
V(v8::FunctionCallback) \ | ||
V(v8::AccessorGetterCallback) \ | ||
V(v8::AccessorSetterCallback) \ | ||
V(v8::AccessorNameGetterCallback) \ | ||
V(v8::AccessorNameSetterCallback) \ | ||
V(v8::GenericNamedPropertyDefinerCallback) \ | ||
V(v8::GenericNamedPropertyDeleterCallback) \ | ||
V(v8::GenericNamedPropertyEnumeratorCallback) \ | ||
V(v8::GenericNamedPropertyQueryCallback) \ | ||
V(v8::GenericNamedPropertySetterCallback) | ||
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#define V(ExternalReferenceType) \ | ||
void Register(ExternalReferenceType addr) { RegisterT(addr); } | ||
ALLOWED_EXTERNAL_REFERENCE_TYPES(V) | ||
#undef V | ||
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// This can be called only once. | ||
const std::vector<intptr_t>& external_references(); | ||
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bool is_empty() { return external_references_.empty(); } | ||
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private: | ||
template <typename T> | ||
void RegisterT(T* address) { | ||
external_references_.push_back(reinterpret_cast<intptr_t>(address)); | ||
} | ||
bool is_finalized_ = false; | ||
std::vector<intptr_t> external_references_; | ||
}; | ||
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#define EXTERNAL_REFERENCE_BINDING_LIST(V) | ||
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} // namespace node | ||
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// Declare all the external reference registration functions here, | ||
// and define them later with #NODE_MODULE_EXTERNAL_REFERENCE(modname, func); | ||
#define V(modname) \ | ||
void _register_external_reference_##modname( \ | ||
node::ExternalReferenceRegistry* registry); | ||
EXTERNAL_REFERENCE_BINDING_LIST(V) | ||
#undef V | ||
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#define NODE_MODULE_EXTERNAL_REFERENCE(modname, func) \ | ||
void _register_external_reference_##modname( \ | ||
node::ExternalReferenceRegistry* registry) { \ | ||
func(registry); \ | ||
} | ||
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS | ||
#endif // SRC_NODE_EXTERNAL_REFERENCE_H_ |
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