[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, 43 insertions, 0 deletions

diff --git a/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/backend/vdef.go b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/backend/vdef.go
new file mode 100644
index 000000000..edfa962b5
--- /dev/null
+++ b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/backend/vdef.go
@@ -0,0 +1,43 @@
+package backend
+
+import (
+	"github.com/tetratelabs/wazero/internal/engine/wazevo/backend/regalloc"
+	"github.com/tetratelabs/wazero/internal/engine/wazevo/ssa"
+)
+
+// SSAValueDefinition represents a definition of an SSA value.
+type SSAValueDefinition struct {
+	// BlockParamValue is valid if Instr == nil
+	BlockParamValue ssa.Value
+
+	// BlkParamVReg is valid if Instr == nil
+	BlkParamVReg regalloc.VReg
+
+	// Instr is not nil if this is a definition from an instruction.
+	Instr *ssa.Instruction
+	// N is the index of the return value in the instr's return values list.
+	N int
+	// RefCount is the number of references to the result.
+	RefCount int
+}
+
+func (d *SSAValueDefinition) IsFromInstr() bool {
+	return d.Instr != nil
+}
+
+func (d *SSAValueDefinition) IsFromBlockParam() bool {
+	return d.Instr == nil
+}
+
+func (d *SSAValueDefinition) SSAValue() ssa.Value {
+	if d.IsFromBlockParam() {
+		return d.BlockParamValue
+	} else {
+		r, rs := d.Instr.Returns()
+		if d.N == 0 {
+			return r
+		} else {
+			return rs[d.N-1]
+		}
+	}
+}