test various chunk sizes for memory allocation

3 files changed, 4 insertions, 2 deletions

diff --git a/src/parseTools.js b/src/parseTools.js
index 20049094..7dafbebe 100644
--- a/src/parseTools.js
+++ b/src/parseTools.js
@@ -1560,7 +1560,7 @@ function makePointer(slab, pos, allocator, type, ptr, finalMemoryInitialization)
   }
 
   // JS engines sometimes say array initializers are too large. Work around that by chunking and calling concat to combine at runtime
-  var chunkSize = 10240;
+  var chunkSize = JS_CHUNK_SIZE;
   function chunkify(array) {
     // break very large slabs into parts
     var ret = '';
diff --git a/src/settings.js b/src/settings.js
index 6b054443..f9b47228 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -357,6 +357,8 @@ var NECESSARY_BLOCKADDRS = []; // List of (function, block) for all block addres
 
 var EMIT_GENERATED_FUNCTIONS = 0; // whether to emit the list of generated functions, needed for external JS optimization passes
 
+var JS_CHUNK_SIZE = 10240; // Used as a maximum size before breaking up expressions and lines into smaller pieces
+
 // Compiler debugging options
 var DEBUG_TAGS_SHOWING = [];
   // Some useful items:
diff --git a/tests/runner.py b/tests/runner.py
index 561d8523..3606ff1d 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -8918,7 +8918,7 @@ TT = %s
   exec('o1 = make_run("o1", compiler=CLANG, emcc_args=["-O1", "-s", "SAFE_HEAP=1"])')
 
   # Make one run with -O2, but without closure (we enable closure in specific tests, otherwise on everything it is too slow)
-  exec('o2 = make_run("o2", compiler=CLANG, emcc_args=["-O2"])')
+  exec('o2 = make_run("o2", compiler=CLANG, emcc_args=["-O2", "-s", "JS_CHUNK_SIZE=10"])')
 
   # asm.js
   exec('asm2 = make_run("asm2", compiler=CLANG, emcc_args=["-O2", "-s", "ASM_JS=1"])')