Get wasm2asm building again (#1107)

* Get wasm2asm building again

Updates CMakeLists.txt to have wasm2asm built by default, updates
wasm2asm.h to account for recent interface changes, and restores
JSPrinter functionality.

* Implement splice for array values

* Clean up wasm2asm testing

* Print semicolons after statements in blocks

* Cleanups and semicolons for condition arms

* Prettify semicolon emission

1 files changed, 21 insertions, 0 deletions

diff --git a/src/mixed_arena.h b/src/mixed_arena.h
index 47e718454..9354527ec 100644
--- a/src/mixed_arena.h
+++ b/src/mixed_arena.h
@@ -163,6 +163,8 @@ protected:
   }
 
 public:
+  struct Iterator;
+
   T& operator[](size_t index) const {
     assert(index < usedElements);
     return data[index];
@@ -206,6 +208,16 @@ public:
     usedElements++;
   }
 
+  void erase(Iterator start_it, Iterator end_it) {
+    assert(start_it.parent == end_it.parent && start_it.parent == this);
+    assert(start_it.index <= end_it.index && end_it.index <= usedElements);
+    size_t size = end_it.index - start_it.index;
+    for (size_t cur = start_it.index; cur + size < usedElements; ++cur) {
+      data[cur] = data[cur + size];
+    }
+    usedElements -= size;
+  }
+
   void clear() {
     usedElements = 0;
   }
@@ -257,6 +269,15 @@ public:
       index++;
     }
 
+    Iterator& operator+=(int off) {
+      index += off;
+      return *this;
+    }
+
+    const Iterator operator+(int off) const {
+      return Iterator(*this) += off;
+    }
+
     T& operator*() {
       return (*parent)[index];
     }