[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, 14 insertions, 0 deletions

diff --git a/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/ssa/ssa.go b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/ssa/ssa.go
new file mode 100644
index 000000000..b477e58bd
--- /dev/null
+++ b/vendor/github.com/tetratelabs/wazero/internal/engine/wazevo/ssa/ssa.go
@@ -0,0 +1,14 @@
+// Package ssa is used to construct SSA function. By nature this is free of Wasm specific thing
+// and ISA.
+//
+// We use the "block argument" variant of SSA: https://en.wikipedia.org/wiki/Static_single-assignment_form#Block_arguments
+// which is equivalent to the traditional PHI function based one, but more convenient during optimizations.
+// However, in this package's source code comment, we might use PHI whenever it seems necessary in order to be aligned with
+// existing literatures, e.g. SSA level optimization algorithms are often described using PHI nodes.
+//
+// The rationale doc for the choice of "block argument" by MLIR of LLVM is worth a read:
+// https://mlir.llvm.org/docs/Rationale/Rationale/#block-arguments-vs-phi-nodes
+//
+// The algorithm to resolve variable definitions used here is based on the paper
+// "Simple and Efficient Construction of Static Single Assignment Form": https://link.springer.com/content/pdf/10.1007/978-3-642-37051-9_6.pdf.
+package ssa