add start to binary format

1 files changed, 16 insertions, 1 deletions

diff --git a/src/wasm-binary.h b/src/wasm-binary.h
index 2c884a4f5..b1db70a97 100644
--- a/src/wasm-binary.h
+++ b/src/wasm-binary.h
@@ -155,7 +155,8 @@ enum Section {
   Functions = 2,
   DataSegments = 4,
   FunctionTable = 5,
-  End = 6
+  End = 6,
+  Start = 7
 };
 
 enum FunctionEntry {
@@ -380,6 +381,7 @@ public:
   }
 
   void write() {
+    writeStart();
     writeMemory();
     writeSignatures();
     writeFunctions();
@@ -389,6 +391,13 @@ public:
     finishUp();
   }
 
+  void writeStart() {
+    if (!wasm->start.is()) return;
+    if (debug) std::cerr << "== writeStart" << std::endl;
+    o << int8_t(BinaryConsts::Start);
+    emitString(wasm->start.str);
+  }
+
   void writeMemory() {
     if (wasm->memory.max == 0) return;
     if (debug) std::cerr << "== writeMemory" << std::endl;
@@ -980,6 +989,7 @@ public:
       }
 
       switch (section) {
+        case BinaryConsts::Start:         readStart(); break;
         case BinaryConsts::Memory:        readMemory(); break;
         case BinaryConsts::Signatures:    readSignatures(); break;
         case BinaryConsts::Functions:     readFunctions(); break;
@@ -1082,6 +1092,11 @@ public:
     assert(x == y);
   }
 
+  void readStart() {
+    if (debug) std::cerr << "== readStart" << std::endl;
+    wasm.start = getString();
+  }
+
   void readMemory() {
     if (debug) std::cerr << "== readMemory" << std::endl;
     size_t initial = getInt8();