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/lib/IR/Instruction.cpp | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'willow/lib/IR/Instruction.cpp')

diff --git a/willow/lib/IR/Instruction.cpp b/willow/lib/IR/Instruction.cpp
index 587736d..a6e0c9b 100644
--- a/willow/lib/IR/Instruction.cpp
+++ b/willow/lib/IR/Instruction.cpp
@@ -1,4 +1,5 @@
 #include <willow/IR/Instruction.h>
+#include <willow/IR/Instructions.h>
 
 namespace willow {
 
@@ -33,6 +34,19 @@ bool Instruction::isTerminatorOp(Opcode op) {
   }
 }
 
-Successors Instruction::succs();
-
+Successors Instruction::succs() {
+  using enum Opcode;
+  switch (op) {
+  case Jmp: {
+    auto inst = static_cast<JmpInst *>(this);
+    return Successors{inst->getTarget()};
+  }
+  case Br: {
+    auto inst = static_cast<BrInst *>(this);
+    return Successors{inst->getTrueTarget(), inst->getFalseTarget()};
+  }
+  default:
+    return Successors{};
+  }
+}
 }; // namespace willow
-- 
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