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60d9aed307
Introduce APIs that allow for the creation of JavaScript strings without copying the underlying native string into the engine. The APIs fall back to regular string creation if the engine's external string APIs are unavailable. In this case, an optional boolean out-parameter indicates that the string was copied, and the optional finalizer is called if given. PR-URL: https://github.com/nodejs/node/pull/48339 Fixes: https://github.com/nodejs/node/issues/48198 Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com> Signed-off-by: Gabriel Schulhof <gabrielschulhof@gmail.com>
57 lines
3.2 KiB
C
57 lines
3.2 KiB
C
#include <assert.h>
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#define NAPI_EXPERIMENTAL
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#include <node_api.h>
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#define NAPI_CALL(call) \
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do { \
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napi_status status = call; \
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assert(status == napi_ok && #call " failed"); \
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} while (0);
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#define EXPORT_FUNC(env, exports, name, func) \
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do { \
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napi_value js_func; \
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NAPI_CALL(napi_create_function( \
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(env), (name), NAPI_AUTO_LENGTH, (func), NULL, &js_func)); \
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NAPI_CALL(napi_set_named_property((env), (exports), (name), js_func)); \
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} while (0);
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const char* one_byte_string = "The Quick Brown Fox Jumped Over The Lazy Dog.";
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const char16_t* two_byte_string =
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u"The Quick Brown Fox Jumped Over The Lazy Dog.";
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#define DECLARE_BINDING(CapName, lowercase_name, var_name) \
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static napi_value CreateString##CapName(napi_env env, \
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napi_callback_info info) { \
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size_t argc = 4; \
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napi_value argv[4]; \
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uint32_t n; \
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uint32_t index; \
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napi_handle_scope scope; \
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napi_value js_string; \
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\
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NAPI_CALL(napi_get_cb_info(env, info, &argc, argv, NULL, NULL)); \
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NAPI_CALL(napi_get_value_uint32(env, argv[0], &n)); \
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NAPI_CALL(napi_open_handle_scope(env, &scope)); \
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NAPI_CALL(napi_call_function(env, argv[1], argv[2], 0, NULL, NULL)); \
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for (index = 0; index < n; index++) { \
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NAPI_CALL(napi_create_string_##lowercase_name( \
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env, (var_name), NAPI_AUTO_LENGTH, &js_string)); \
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} \
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NAPI_CALL(napi_call_function(env, argv[1], argv[3], 1, &argv[0], NULL)); \
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NAPI_CALL(napi_close_handle_scope(env, scope)); \
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\
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return NULL; \
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}
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DECLARE_BINDING(Latin1, latin1, one_byte_string)
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DECLARE_BINDING(Utf8, utf8, one_byte_string)
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DECLARE_BINDING(Utf16, utf16, two_byte_string)
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NAPI_MODULE_INIT() {
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EXPORT_FUNC(env, exports, "createStringLatin1", CreateStringLatin1);
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EXPORT_FUNC(env, exports, "createStringUtf8", CreateStringUtf8);
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EXPORT_FUNC(env, exports, "createStringUtf16", CreateStringUtf16);
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return exports;
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}
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