From 65541eaf91b49c6eaf25a0610e9c983814f96f1c Mon Sep 17 00:00:00 2001
From: Nikita Smith <git.nikita.smith@gmail.com>
Date: Sun, 12 Jul 2026 23:13:51 -0700
Subject: [PATCH] LLVM BC magic sniffer

---
 src/llvm/llvm.c | 21 +++++++++++++++++++++
 src/llvm/llvm.h |  2 +-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/llvm/llvm.c b/src/llvm/llvm.c
index f5a0f364..581ebe71 100644
--- a/src/llvm/llvm.c
+++ b/src/llvm/llvm.c
@@ -22,3 +22,24 @@ llvm_hash_size_from_alg(LLVM_GHashAlg v)
   }
   return 0;
 }
+
+internal B32
+llvm_is_bitcode(String8 data)
+{
+  if (data.size < 4) {
+    return 0;
+  }
+
+  // raw LLVM bitcode magic
+  if (data.str[0] == 'B' && data.str[1] == 'C' && data.str[2] == 0xc0 && data.str[3] == 0xde) {
+    return 1;
+  }
+
+  // LLVM bitcode wrapper magic
+  if (data.str[0] == 0xde && data.str[1] == 0xc0 && data.str[2] == 0x17 && data.str[3] == 0x0b) {
+    return 1;
+  }
+
+  return 0;
+}
+
diff --git a/src/llvm/llvm.h b/src/llvm/llvm.h
index 0ddc399f..34ba614b 100644
--- a/src/llvm/llvm.h
+++ b/src/llvm/llvm.h
@@ -25,6 +25,6 @@ typedef struct LLVM_GHash
 
 internal String8 llvm_string_from_ghash_alg(LLVM_GHashAlg v);
 internal U64     llvm_hash_size_from_alg(LLVM_GHashAlg v);
+internal B32     llvm_is_bitcode(String8 data);
 
 #endif // LLVM_H
-