[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, 32 insertions, 0 deletions

diff --git a/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/isa_arm64.go b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/isa_arm64.go
new file mode 100644
index 000000000..e7a846548
--- /dev/null
+++ b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/isa_arm64.go
@@ -0,0 +1,32 @@
+//go:build arm64
+
+package wazevo
+
+import (
+	"github.com/tetratelabs/wazero/internal/engine/wazevo/backend"
+	"github.com/tetratelabs/wazero/internal/engine/wazevo/backend/isa/arm64"
+)
+
+func newMachine() backend.Machine {
+	return arm64.NewBackend()
+}
+
+// unwindStack is a function to unwind the stack, and appends return addresses to `returnAddresses` slice.
+// The implementation must be aligned with the ABI/Calling convention.
+func unwindStack(sp, fp, top uintptr, returnAddresses []uintptr) []uintptr {
+	return arm64.UnwindStack(sp, fp, top, returnAddresses)
+}
+
+// goCallStackView is a function to get a view of the stack before a Go call, which
+// is the view of the stack allocated in CompileGoFunctionTrampoline.
+func goCallStackView(stackPointerBeforeGoCall *uint64) []uint64 {
+	return arm64.GoCallStackView(stackPointerBeforeGoCall)
+}
+
+// adjustClonedStack is a function to adjust the stack after it is grown.
+// More precisely, absolute addresses (frame pointers) in the stack must be adjusted.
+func adjustClonedStack(oldsp, oldTop, sp, fp, top uintptr) {
+	// TODO: currently, the frame pointers are not used, and saved old sps are relative to the current stack pointer,
+	//  so no need to adjustment on arm64. However, when we make it absolute, which in my opinion is better perf-wise
+	//  at the expense of slightly costly stack growth, we need to adjust the pushed frame pointers.
+}