Add BinaryenAddCustomSection API (#2381)

This adds a new BinaryenAddCustomSection API so a generator can add arbitrary
custom sections to a module.

2 files changed, 37 insertions, 0 deletions

diff --git a/test/binaryen.js/custom-section.js b/test/binaryen.js/custom-section.js
new file mode 100644
index 000000000..f61af0096
--- /dev/null
+++ b/test/binaryen.js/custom-section.js
@@ -0,0 +1,11 @@
+function assert(x) {
+  if (!x) throw 'error!';
+}
+
+Binaryen.setAPITracing(true);
+var module = new Binaryen.Module();
+
+module.addCustomSection("hello", [119, 111, 114, 108, 100]);
+
+assert(module.validate());
+console.log(module.emitText());
diff --git a/test/binaryen.js/custom-section.js.txt b/test/binaryen.js/custom-section.js.txt
new file mode 100644
index 000000000..7ac835fdf
--- /dev/null
+++ b/test/binaryen.js/custom-section.js.txt
@@ -0,0 +1,26 @@
+// beginning a Binaryen API trace
+#include <math.h>
+#include <map>
+#include "binaryen-c.h"
+int main() {
+  std::map<size_t, BinaryenFunctionTypeRef> functionTypes;
+  std::map<size_t, BinaryenExpressionRef> expressions;
+  std::map<size_t, BinaryenFunctionRef> functions;
+  std::map<size_t, BinaryenGlobalRef> globals;
+  std::map<size_t, BinaryenEventRef> events;
+  std::map<size_t, BinaryenExportRef> exports;
+  std::map<size_t, RelooperBlockRef> relooperBlocks;
+  BinaryenModuleRef the_module = NULL;
+  RelooperRef the_relooper = NULL;
+  the_module = BinaryenModuleCreate();
+  expressions[size_t(NULL)] = BinaryenExpressionRef(NULL);
+  {
+    const char contents[] = { 119, 111, 114, 108, 100 };
+    BinaryenAddCustomSection(the_module, "hello", contents, 5);
+  }
+  BinaryenModuleValidate(the_module);
+  BinaryenModulePrint(the_module);
+(module
+ ;; custom section "hello", size 5, contents: "world"
+)
+