feat: add BinaryenExpressionAllocateAndWriteText

src/binaryen-c.cpp

@@ -2077,6 +2077,20 @@ BinaryenExpressionRef BinaryenExpressionCopy(BinaryenExpressionRef expr,
                                              BinaryenModuleRef module) {
   return ExpressionManipulator::copy(expr, *(Module*)module);
 }
+char* BinaryenExpressionAllocateAndWriteText(BinaryenExpressionRef expr) {
+  std::ostringstream os;
+  bool colors = Colors::isEnabled();
+
+  Colors::setEnabled(false); // do not use colors for writing
+  os << *(Expression*)expr;
+  Colors::setEnabled(colors); // restore colors state
+
+  auto str = os.str();
+  const size_t len = str.length() + 1;
+  char* output = (char*)malloc(len);
+  std::copy_n(str.c_str(), len, output);
+  return output;
+}
 
 // Specific expression utility
 

src/binaryen-c.h

@@ -1218,6 +1218,10 @@ BINARYEN_API void BinaryenExpressionFinalize(BinaryenExpressionRef expr);
 // Makes a deep copy of the given expression.
 BINARYEN_API BinaryenExpressionRef
 BinaryenExpressionCopy(BinaryenExpressionRef expr, BinaryenModuleRef module);
+// Serialize an expression in s-expression form. Implicitly allocates the returned
+// char* with malloc(), and expects the user to free() them manually
+// once not needed anymore.
+BINARYEN_API char* BinaryenExpressionAllocateAndWriteText(BinaryenExpressionRef expr);
 
 // Block