From 5fc15eb3394e73fb19bc4dd5d9043a80296d38f7 Mon Sep 17 00:00:00 2001
From: Ryan Lester <hacker@linux.com>
Date: Wed, 14 Jun 2017 22:53:04 -0400
Subject: [PATCH] binaryen get_subresource_location timing fix (#5296)

---
 emcc.py         | 25 +++++++++++++++++++++----
 tools/shared.py | 10 +++++++++-
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/emcc.py b/emcc.py
index 9b42773adf22e..853ceb5ae29ad 100755
--- a/emcc.py
+++ b/emcc.py
@@ -1115,10 +1115,10 @@ def check(input_file):
         os.environ['EMCC_WASM_BACKEND_BINARYEN'] = '1'
 
       if shared.Settings.BINARYEN:
-        # set file locations, so that JS glue can find what it needs
-        shared.Settings.WASM_TEXT_FILE = shared.JS.get_subresource_location(wasm_text_target)
-        shared.Settings.WASM_BINARY_FILE = shared.JS.get_subresource_location(wasm_binary_target)
-        shared.Settings.ASMJS_CODE_FILE = shared.JS.get_subresource_location(asm_target)
+        # placeholder strings for JS glue, to be replaced with subresource locations in do_binaryen
+        shared.Settings.WASM_TEXT_FILE = shared.FilenameReplacementStrings.WASM_TEXT_FILE
+        shared.Settings.WASM_BINARY_FILE = shared.FilenameReplacementStrings.WASM_BINARY_FILE
+        shared.Settings.ASMJS_CODE_FILE = shared.FilenameReplacementStrings.ASMJS_CODE_FILE
 
         shared.Settings.ASM_JS = 2 # when targeting wasm, we use a wasm Memory, but that is not compatible with asm.js opts
         shared.Settings.GLOBAL_BASE = 1024 # leave some room for mapping global vars
@@ -2313,6 +2313,23 @@ def do_binaryen(final, target, asm_target, options, memfile, wasm_binary_target,
           passes.append('minifyWhitespace')
         final = shared.Building.js_optimizer_no_asmjs(final, passes)
       if DEBUG: save_intermediate('postclean', 'js')
+  # replace placeholder strings with correct subresource locations
+  f = open(final, 'r')
+  js = f.read()
+  f.close()
+  f = open(final, 'w')
+  for tup in [
+    (wasm_text_target, shared.FilenameReplacementStrings.WASM_TEXT_FILE),
+    (wasm_binary_target, shared.FilenameReplacementStrings.WASM_BINARY_FILE),
+    (asm_target, shared.FilenameReplacementStrings.ASMJS_CODE_FILE)
+  ]:
+    if not os.path.isfile(tup[0]):
+      continue
+    js = js.replace(tup[1], shared.JS.get_subresource_location(tup[0]))
+    if shared.Settings.SINGLE_FILE:
+      os.remove(tup[0])
+  f.write(js)
+  f.close()
   return final
 
 
diff --git a/tools/shared.py b/tools/shared.py
index 54fc76749df07..35c07e0bfa4af 100644
--- a/tools/shared.py
+++ b/tools/shared.py
@@ -2265,6 +2265,12 @@ def reconfigure_cache():
   global Cache
   Cache = cache.Cache(debug=DEBUG_CACHE)
 
+# Temporary workaround for SINGLE_FILE, pending refactoring
+class FilenameReplacementStrings:
+  WASM_TEXT_FILE = 'FILENAME_REPLACEMENT_STRINGS_WASM_TEXT_FILE'
+  WASM_BINARY_FILE = 'FILENAME_REPLACEMENT_STRINGS_WASM_BINARY_FILE'
+  ASMJS_CODE_FILE = 'FILENAME_REPLACEMENT_STRINGS_ASMJS_CODE_FILE'
+
 class JS:
   memory_initializer_pattern = '/\* memory initializer \*/ allocate\(\[([\d, ]*)\], "i8", ALLOC_NONE, ([\d+Runtime\.GLOBAL_BASEHgb]+)\);'
   no_memory_initializer_pattern = '/\* no memory initializer \*/'
@@ -2279,7 +2285,9 @@ def to_nice_ident(ident): # limited version of the JS function toNiceIdent
 
   # Returns the subresource location for run-time access
   @staticmethod
-  def get_subresource_location(path, data_uri=Settings.SINGLE_FILE):
+  def get_subresource_location(path, data_uri=None):
+    if data_uri is None:
+      data_uri = Settings.SINGLE_FILE
     if data_uri:
       Settings.INCLUDE_THIRD_PARTY_SODIUMUTIL = 1
       f = open(path, 'rb')