[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, 42 insertions, 0 deletions

diff --git a/vendor/github.com/tetratelabs/wazero/internal/wasm/binary/memory.go b/vendor/github.com/tetratelabs/wazero/internal/wasm/binary/memory.go
new file mode 100644
index 000000000..e1b175123
--- /dev/null
+++ b/vendor/github.com/tetratelabs/wazero/internal/wasm/binary/memory.go
@@ -0,0 +1,42 @@
+package binary
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/tetratelabs/wazero/api"
+	"github.com/tetratelabs/wazero/experimental"
+	"github.com/tetratelabs/wazero/internal/wasm"
+)
+
+// decodeMemory returns the api.Memory decoded with the WebAssembly 1.0 (20191205) Binary Format.
+//
+// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-memory
+func decodeMemory(
+	r *bytes.Reader,
+	enabledFeatures api.CoreFeatures,
+	memorySizer func(minPages uint32, maxPages *uint32) (min, capacity, max uint32),
+	memoryLimitPages uint32,
+) (*wasm.Memory, error) {
+	min, maxP, shared, err := decodeLimitsType(r)
+	if err != nil {
+		return nil, err
+	}
+
+	if shared {
+		if !enabledFeatures.IsEnabled(experimental.CoreFeaturesThreads) {
+			return nil, fmt.Errorf("shared memory requested but threads feature not enabled")
+		}
+
+		// This restriction may be lifted in the future.
+		// https://webassembly.github.io/threads/core/binary/types.html#memory-types
+		if maxP == nil {
+			return nil, fmt.Errorf("shared memory requires a maximum size to be specified")
+		}
+	}
+
+	min, capacity, max := memorySizer(min, maxP)
+	mem := &wasm.Memory{Min: min, Cap: capacity, Max: max, IsMaxEncoded: maxP != nil, IsShared: shared}
+
+	return mem, mem.Validate(memoryLimitPages)
+}