From add95b14f74e6dbe04a6efe98ff0f20424930b73 Mon Sep 17 00:00:00 2001
From: Stefan Weigl-Bosker <stefan@s00.xyz>
Date: Tue, 3 Feb 2026 14:59:53 -0500
Subject: [willow]: initial frontend work, unit tests (#8)

---
 willow/tools/willowc/include/ast.hpp | 62 ++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 willow/tools/willowc/include/ast.hpp

(limited to 'willow/tools/willowc/include/ast.hpp')

diff --git a/willow/tools/willowc/include/ast.hpp b/willow/tools/willowc/include/ast.hpp
new file mode 100644
index 0000000..8c59067
--- /dev/null
+++ b/willow/tools/willowc/include/ast.hpp
@@ -0,0 +1,62 @@
+#ifndef WILLOWC_INCLUDE_AST_HPP
+#define WILLOWC_INCLUDE_AST_HPP
+
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+#include <willow/IR/Instructions.h>
+#include <willow/IR/Types.h>
+
+#include <tokenizer.hpp>
+
+namespace willowc {
+
+using Opcode = willow::Instruction::Opcode;
+using TokenIndex = std::size_t;
+
+// this is like willow::ValueKind, but treats groups all ssa values into 'Value'
+// (because they can't be differentiated by syntax alone)
+enum class ExprKind { Constant, BasicBlock, Function, Value };
+
+struct ExprAST {
+  ExprKind kind;
+
+  std::string name;
+  // token??
+};
+
+struct InstAST {
+  Opcode op;
+  std::string name;
+
+  std::vector<std::unique_ptr<ExprAST>> args;
+};
+
+struct BlockAST {
+  std::string label;
+  std::vector<std::unique_ptr<InstAST>> body;
+};
+
+struct ParameterAST {
+  std::string name;
+  willow::Type type;
+};
+
+struct FunctionDeclAST {
+  std::string name;
+  std::vector<std::unique_ptr<ParameterAST>> parameters;
+  std::string returntype;
+
+  std::vector<std::unique_ptr<BlockAST>> body;
+  // TODO: movable symbol table
+};
+
+struct ModuleAST {
+  std::vector<std::unique_ptr<FunctionDeclAST>> Functions;
+  // TODO: imports, symbol table
+};
+
+}; // namespace willowc
+
+#endif // WILLOWC_INCLUDE_AST_HPP
-- 
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