[experiment] add alternative wasm sqlite3 implementation available via build-tag (#2863)

This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).

1 files changed, 15 insertions, 0 deletions

diff --git a/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/wazevoapi/ptr.go b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/wazevoapi/ptr.go
new file mode 100644
index 000000000..f21e1a5d8
--- /dev/null
+++ b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/wazevoapi/ptr.go
@@ -0,0 +1,15 @@
+package wazevoapi
+
+import "unsafe"
+
+// PtrFromUintptr resurrects the original *T from the given uintptr.
+// The caller of this function MUST be sure that ptr is valid.
+func PtrFromUintptr[T any](ptr uintptr) *T {
+	// Wraps ptrs as the double pointer in order to avoid the unsafe access as detected by race detector.
+	//
+	// For example, if we have (*function)(unsafe.Pointer(ptr)) instead, then the race detector's "checkptr"
+	// subroutine wanrs as "checkptr: pointer arithmetic result points to invalid allocation"
+	// https://github.com/golang/go/blob/1ce7fcf139417d618c2730010ede2afb41664211/src/runtime/checkptr.go#L69
+	var wrapped *uintptr = &ptr
+	return *(**T)(unsafe.Pointer(wrapped))
+}