automatically adjust asm heap size

1 files changed, 10 insertions, 0 deletions

diff --git a/emcc b/emcc
index ff81e424..cb489e5d 100755
--- a/emcc
+++ b/emcc
@@ -1105,6 +1105,16 @@ try:
       shared.Settings.CORRECT_OVERFLOWS = 1
     assert not shared.Settings.PGO, 'cannot run PGO in ASM_JS mode'
 
+    heap = 4096
+    while heap < shared.Settings.TOTAL_MEMORY:
+      if heap <= 16*1024*1024:
+        heap *= 2
+      else:
+        heap += 16*1024*1024
+    if heap != shared.Settings.TOTAL_MEMORY:
+      logging.warning('increasing TOTAL_MEMORY to %d to be more reasonable for asm.js' % heap)
+      shared.Settings.TOTAL_MEMORY = heap
+
   if shared.Settings.CORRECT_SIGNS >= 2 or shared.Settings.CORRECT_OVERFLOWS >= 2 or shared.Settings.CORRECT_ROUNDINGS >= 2:
     debug_level = 4 # must keep debug info to do line-by-line operations