From 6bb4f42f6d56970ed2964c1bfd9849f63937fe39 Mon Sep 17 00:00:00 2001
From: Chris Fallin <chris@cfallin.org>
Date: Fri, 12 Nov 2021 22:16:54 -0800
Subject: [PATCH] Skeleton of IR.

---
 Cargo.toml | 11 +++++++++++
 src/ir.rs  | 25 +++++++++++++++++++++++++
 src/lib.rs |  8 ++++++++
 3 files changed, 44 insertions(+)
 create mode 100644 Cargo.toml
 create mode 100644 src/ir.rs
 create mode 100644 src/lib.rs

diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a9c1fed
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "waffle"
+version = "0.0.1"
+description = "Wasm Analysis Framework For Lightweight Experiments"
+author = ["Chris Fallin <chris@cfallin.org>"]
+license = "Apache-2.0 WITH LLVM-exception"
+edition = "2018"
+
+[dependencies]
+wasmparser = "0.81"
+wasm-encoder = "0.3"
diff --git a/src/ir.rs b/src/ir.rs
new file mode 100644
index 0000000..556b0e0
--- /dev/null
+++ b/src/ir.rs
@@ -0,0 +1,25 @@
+//! Intermediate representation for Wasm.
+
+use wasmparser::{FuncType, Type};
+
+pub type SignatureId = usize;
+pub type FuncId = usize;
+
+#[derive(Clone, Debug)]
+pub struct Module {
+    pub funcs: Vec<FuncDecl>,
+    pub signatures: Vec<FuncType>,
+}
+
+#[derive(Clone, Debug)]
+pub enum FuncDecl {
+    Import(SignatureId),
+    Body(SignatureId, Function),
+}
+
+#[derive(Clone, Debug)]
+pub struct Function {
+    pub id: FuncId,
+    pub signature: SignatureId,
+    pub locals: Vec<Type>,
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..01e38da
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,8 @@
+//! WAFFLE Wasm analysis framework.
+
+// Re-export wasmparser and wasmencoder for easier use of the right
+// version by our embedders.
+pub use wasmparser;
+pub use wasm_encoder;
+
+pub mod ir;