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Add some docs explaining a particular piece of [ae0196d86ee8]. No code changes.

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FossilOrigin-Name: 7f96803c1cbd0633367173ab0a67a8b301b9e0746e460c50d506b536c15db0a0
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stephan
2023-01-02 20:52:46 +00:00
parent b1cc895c92
commit e364a9da72
3 changed files with 28 additions and 7 deletions
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21
ext/wasm/api/sqlite3-wasm.c
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@ -1597,6 +1597,27 @@ int sqlite3_wasm_config_j(int op, sqlite3_int64 arg){
return sqlite3_config(op, arg);
}
/*
** This function is NOT part of the sqlite3 public API. It is strictly
** for use by the sqlite project's own JS/WASM bindings.
**
** Returns a pointer to sqlite3_free(). In compliant browsers the
** return value, when passed to sqlite3.wasm.exports.functionEntry(),
** must resolve to the same function as
** sqlite3.wasm.exports.sqlite3_free. i.e. from a dev console where
** sqlite3 is exported globally, the following must be true:
**
** ```
** sqlite3.wasm.functionEntry(
** sqlite3.wasm.exports.sqlite3_wasm_ptr_to_sqlite3_free()
** ) === sqlite3.wasm.exports.sqlite3_free
** ```
**
** Using a function to return this pointer, as opposed to exporting it
** via sqlite3_wasm_enum_json(), is an attempt to work around a
** Safari-specific quirk covered at
** https://sqlite.org/forum/info/e5b20e1feb37a19a.
**/
SQLITE_WASM_KEEP
void * sqlite3_wasm_ptr_to_sqlite3_free(void){
return (void*)sqlite3_free;