Add event section (#2151)

This adds support for the event and the event section, as specified in
https://github.com/WebAssembly/exception-handling/blob/master/proposals/Exceptions.md#changes-to-the-binary-model.

Wasm events are features that suspend the current execution and transfer
the control flow to a corresponding handler. Currently the only
supported event kind is exceptions.

For events, this includes support for
- Binary file reading/writing
- Wast file reading/writing
- Binaryen.js API
- Fuzzer
- Validation
- Metadce
- Passes: metrics, minify-imports-and-exports,
  remove-unused-module-elements

1 files changed, 37 insertions, 0 deletions

diff --git a/src/js/binaryen.js-post.js b/src/js/binaryen.js-post.js
index 180d08bb5..d2703e425 100644
--- a/src/js/binaryen.js-post.js
+++ b/src/js/binaryen.js-post.js
@@ -84,6 +84,7 @@ Module['ExternalFunction'] = Module['_BinaryenExternalFunction']();
 Module['ExternalTable'] = Module['_BinaryenExternalTable']();
 Module['ExternalMemory'] = Module['_BinaryenExternalMemory']();
 Module['ExternalGlobal'] = Module['_BinaryenExternalGlobal']();
+Module['ExternalEvent'] = Module['_BinaryenExternalEvent']();
 
 // Features
 Module['Features'] = {
@@ -1788,6 +1789,21 @@ function wrapModule(module, self) {
       return Module['_BinaryenRemoveGlobal'](module, strToStack(name));
     });
   }
+  self['addEvent'] = function(name, attribute, eventType) {
+    return preserveStack(function() {
+      return Module['_BinaryenAddEvent'](module, strToStack(name), attribute, eventType);
+    });
+  };
+  self['getEvent'] = function(name) {
+    return preserveStack(function() {
+      return Module['_BinaryenGetEvent'](module, strToStack(name));
+    });
+  };
+  self['removeEvent'] = function(name) {
+    return preserveStack(function() {
+      return Module['_BinaryenRemoveEvent'](module, strToStack(name));
+    });
+  };
   self['addFunctionImport'] = function(internalName, externalModuleName, externalBaseName, functionType) {
     return preserveStack(function() {
       return Module['_BinaryenAddFunctionImport'](module, strToStack(internalName), strToStack(externalModuleName), strToStack(externalBaseName), functionType);
@@ -1808,6 +1824,11 @@ function wrapModule(module, self) {
       return Module['_BinaryenAddGlobalImport'](module, strToStack(internalName), strToStack(externalModuleName), strToStack(externalBaseName), globalType);
     });
   };
+  self['addEventImport'] = function(internalName, externalModuleName, externalBaseName, attribute, eventType) {
+    return preserveStack(function() {
+      return Module['_BinaryenAddEventImport'](module, strToStack(internalName), strToStack(externalModuleName), strToStack(externalBaseName), attribute, eventType);
+    });
+  };
   self['addExport'] = // deprecated
   self['addFunctionExport'] = function(internalName, externalName) {
     return preserveStack(function() {
@@ -1829,6 +1850,11 @@ function wrapModule(module, self) {
       return Module['_BinaryenAddGlobalExport'](module, strToStack(internalName), strToStack(externalName));
     });
   };
+  self['addEventExport'] = function(internalName, externalName) {
+    return preserveStack(function() {
+      return Module['_BinaryenAddEventExport'](module, strToStack(internalName), strToStack(externalName));
+    });
+  };
   self['removeExport'] = function(externalName) {
     return preserveStack(function() {
       return Module['_BinaryenRemoveExport'](module, strToStack(externalName));
@@ -2354,6 +2380,17 @@ Module['getGlobalInfo'] = function(global) {
   };
 };
 
+// Obtains information about a 'Event'
+Module['getEventInfo'] = function(event_) {
+  return {
+    'name': UTF8ToString(Module['_BinaryenEventGetName'](event_)),
+    'module': UTF8ToString(Module['_BinaryenEventImportGetModule'](event_)),
+    'base': UTF8ToString(Module['_BinaryenEventImportGetBase'](event_)),
+    'attribute': Module['_BinaryenEventGetAttribute'](event_),
+    'type': UTF8ToString(Module['_BinaryenEventGetType'](event_))
+  };
+};
+
 // Obtains information about an 'Export'
 Module['getExportInfo'] = function(export_) {
   return {