Asm.js-style setjmp/longjmp support for wasm (#681)

This needs to export realloc as well, in addition to malloc and free
handled in #4469. To support asm.js style setjmp/longjmp, wasm
needs to export realloc as well, in addition to malloc and free
handled in #4469. saveSetjmp() uses realloc within it, and realloc is
not implemented in JS glue code.

1 files changed, 9 insertions, 6 deletions

diff --git a/src/wasm-linker.cpp b/src/wasm-linker.cpp
index 2c9a4cd4d..b1160e94a 100644
--- a/src/wasm-linker.cpp
+++ b/src/wasm-linker.cpp
@@ -213,18 +213,21 @@ void Linker::layout() {
     }
   }
 
-  // Export malloc and free whenever availble. JavsScript version of malloc has
-  // some issues and it cannot be called once _sbrk() is called.
-  // TODO This should get the list of exported functions from emcc.py - it has
-  // EXPORTED_FUNCTION metadata to keep track of this. Get the list of exported
-  // functions using a command-line argument from emcc.py and export all of
-  // them.
+  // Export malloc, realloc, and free whenever availble. JavsScript version of
+  // malloc has some issues and it cannot be called once _sbrk() is called, and
+  // JS glue code does not have realloc().  TODO This should get the list of
+  // exported functions from emcc.py - it has EXPORTED_FUNCTION metadata to keep
+  // track of this. Get the list of exported functions using a command-line
+  // argument from emcc.py and export all of them.
   if (out.symbolInfo.implementedFunctions.count("malloc")) {
     exportFunction("malloc", true);
   }
   if (out.symbolInfo.implementedFunctions.count("free")) {
     exportFunction("free", true);
   }
+  if (out.symbolInfo.implementedFunctions.count("realloc")) {
+    exportFunction("realloc", true);
+  }
 
   // finalize function table
   if (out.wasm.table.segments.size() > 0) {