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#ifndef SRC_NODE_CONTEXT_DATA_H_
#define SRC_NODE_CONTEXT_DATA_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#include "util.h"
#include "v8.h"
namespace node {
// Pick an index that's hopefully out of the way when we're embedded inside
// another application. Performance-wise or memory-wise it doesn't matter:
// Context::SetAlignedPointerInEmbedderData() is backed by a FixedArray,
// worst case we pay a one-time penalty for resizing the array.
#ifndef NODE_CONTEXT_EMBEDDER_DATA_INDEX
#define NODE_CONTEXT_EMBEDDER_DATA_INDEX 32
#endif
#ifndef NODE_CONTEXT_SANDBOX_OBJECT_INDEX
#define NODE_CONTEXT_SANDBOX_OBJECT_INDEX 33
#endif
#ifndef NODE_CONTEXT_ALLOW_WASM_CODE_GENERATION_INDEX
#define NODE_CONTEXT_ALLOW_WASM_CODE_GENERATION_INDEX 34
#endif
#ifndef NODE_BINDING_DATA_STORE_INDEX
#define NODE_BINDING_DATA_STORE_INDEX 35
#endif
#ifndef NODE_CONTEXT_ALLOW_CODE_GENERATION_FROM_STRINGS_INDEX
#define NODE_CONTEXT_ALLOW_CODE_GENERATION_FROM_STRINGS_INDEX 36
#endif
#ifndef NODE_CONTEXT_CONTEXTIFY_CONTEXT_INDEX
#define NODE_CONTEXT_CONTEXTIFY_CONTEXT_INDEX 37
#endif
#ifndef NODE_CONTEXT_REALM_INDEX
#define NODE_CONTEXT_REALM_INDEX 38
#endif
// NODE_CONTEXT_TAG must be greater than any embedder indexes so that a single
// check on the number of embedder data fields can assure the presence of all
// embedder indexes.
#ifndef NODE_CONTEXT_TAG
#define NODE_CONTEXT_TAG 39
#endif
enum ContextEmbedderIndex {
kEnvironment = NODE_CONTEXT_EMBEDDER_DATA_INDEX,
kSandboxObject = NODE_CONTEXT_SANDBOX_OBJECT_INDEX,
kAllowWasmCodeGeneration = NODE_CONTEXT_ALLOW_WASM_CODE_GENERATION_INDEX,
kBindingDataStoreIndex = NODE_BINDING_DATA_STORE_INDEX,
kAllowCodeGenerationFromStrings =
NODE_CONTEXT_ALLOW_CODE_GENERATION_FROM_STRINGS_INDEX,
kContextifyContext = NODE_CONTEXT_CONTEXTIFY_CONTEXT_INDEX,
kRealm = NODE_CONTEXT_REALM_INDEX,
kContextTag = NODE_CONTEXT_TAG,
};
class ContextEmbedderTag {
public:
static inline void TagNodeContext(v8::Local<v8::Context> context) {
// Used by ContextEmbedderTag::IsNodeContext to know that we are on a node
// context.
context->SetAlignedPointerInEmbedderData(
ContextEmbedderIndex::kContextTag,
ContextEmbedderTag::kNodeContextTagPtr);
}
static inline bool IsNodeContext(v8::Local<v8::Context> context) {
if (UNLIKELY(context.IsEmpty())) {
return false;
}
if (UNLIKELY(context->GetNumberOfEmbedderDataFields() <=
ContextEmbedderIndex::kContextTag)) {
return false;
}
if (UNLIKELY(context->GetAlignedPointerFromEmbedderData(
ContextEmbedderIndex::kContextTag) !=
ContextEmbedderTag::kNodeContextTagPtr)) {
return false;
}
return true;
}
private:
static void* const kNodeContextTagPtr;
static int const kNodeContextTag;
ContextEmbedderTag() = delete;
};
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_NODE_CONTEXT_DATA_H_
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