Add new --emit-minification-map flag and use it in metadce tests (ems…

…cripten-core#22428) This greatly increases the utility of the output files for these tests.
stbergmann · Aug 21, 2024 · 4182c11 · 4182c11
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diff --git a/ChangeLog.md b/ChangeLog.md
@@ -20,6 +20,9 @@ See docs/process.md for more on how version tagging works.
 
 3.1.65 (in development)
 -----------------------
+- A new `--emit-minification-map` command line flag was added, which can be used
+  to emit a minifiction map in the case that import/export minification is
+  performed (this happens at higher optimization levels). (#22428)
 - Remove `Module['quit']` handling.  This could be used to override the internal
   method for shutting down the program, but it was neither documented nor
   tested.  Programs that want to intercept the shutting down of a program can

diff --git a/docs/emcc.txt b/docs/emcc.txt
@@ -240,6 +240,12 @@ Options that are modified or new in *emcc* are listed below:
      "[name].js.symbols" (with WASM symbols) and
      "[name].wasm.js.symbols" (with ASM.js symbols)
 
+"--emit-minification-map <file>"
+   [link] In cases where emscripten performs import/export minificiton
+   this option can be used to output a file that maps minified names
+   back to their original names.  The format of this file is single
+   line per import/export of the form "<minname>:<origname>".
+
 "-flto"
    [compile+link] Enables link-time optimizations (LTO).
 

diff --git a/emcc.py b/emcc.py
@@ -1286,6 +1286,8 @@ def consume_arg_file():
     elif check_flag('--emit-symbol-map'):
       options.emit_symbol_map = True
       settings.EMIT_SYMBOL_MAP = 1
+    elif check_arg('--emit-minification-map'):
+      settings.MINIFICATION_MAP = consume_arg()
     elif check_arg('--embed-file'):
       options.embed_files.append(consume_arg())
     elif check_arg('--preload-file'):

diff --git a/site/source/docs/tools_reference/emcc.rst b/site/source/docs/tools_reference/emcc.rst
@@ -241,6 +241,15 @@ Options that are modified or new in *emcc* are listed below:
 
   .. note:: When used with ``-sWASM=2``, two symbol files are created. ``[name].js.symbols`` (with WASM symbols) and ``[name].wasm.js.symbols`` (with ASM.js symbols)
 
+.. _emcc-emit-minification-map:
+
+``--emit-minification-map <file>``
+  [link]
+  In cases where emscripten performs import/export minificiton this option can
+  be used to output a file that maps minified names back to their original
+  names.  The format of this file is single line per import/export of the form
+  ``<minname>:<origname>``.
+
 .. _emcc-lto:
 
 ``-flto``

diff --git a/src/settings_internal.js b/src/settings_internal.js
@@ -267,3 +267,5 @@ var WARN_DEPRECATED = true;
 var WEBGL_USE_GARBAGE_FREE_APIS = false;
 
 var INCLUDE_WEBGL1_FALLBACK = true;
+
+var MINIFICATION_MAP = '';
diff --git a/test/other/metadce/test_metadce_files_js_fs.exports b/test/other/metadce/test_metadce_files_js_fs.exports
@@ -1,4 +1,4 @@
-e
-f
-g
-h
+e (memory)
+f (__wasm_call_ctors)
+g (main)
+h (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_files_js_fs.imports b/test/other/metadce/test_metadce_files_js_fs.imports
@@ -1,4 +1,4 @@
-a.a
-a.b
-a.c
-a.d
+a (fd_write)
+b (fd_read)
+c (fd_close)
+d (__syscall_openat)
diff --git a/test/other/metadce/test_metadce_files_js_fs.sent b/test/other/metadce/test_metadce_files_js_fs.sent
@@ -1,4 +1,4 @@
-a
-b
-c
-d
+a (fd_write)
+b (fd_read)
+c (fd_close)
+d (__syscall_openat)
diff --git a/test/other/metadce/test_metadce_files_wasmfs.exports b/test/other/metadce/test_metadce_files_wasmfs.exports
@@ -1,4 +1,4 @@
-q
-r
-s
-t
+q (memory)
+r (__wasm_call_ctors)
+s (main)
+t (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_files_wasmfs.imports b/test/other/metadce/test_metadce_files_wasmfs.imports
@@ -1,16 +1,16 @@
-a.a
-a.b
-a.c
-a.d
-a.e
-a.f
-a.g
-a.h
-a.i
-a.j
-a.k
-a.l
-a.m
-a.n
-a.o
-a.p
+a (emscripten_date_now)
+b (emscripten_err)
+c (getentropy)
+d (emscripten_resize_heap)
+e (emscripten_out)
+f (_wasmfs_stdin_get_char)
+g (_wasmfs_get_preloaded_path_name)
+h (_wasmfs_get_preloaded_parent_path)
+i (_wasmfs_get_preloaded_file_size)
+j (_wasmfs_get_preloaded_file_mode)
+k (_wasmfs_get_preloaded_child_path)
+l (_wasmfs_get_num_preloaded_files)
+m (_wasmfs_get_num_preloaded_dirs)
+n (_wasmfs_copy_preloaded_file_data)
+o (_emscripten_memcpy_js)
+p (_abort_js)
diff --git a/test/other/metadce/test_metadce_files_wasmfs.sent b/test/other/metadce/test_metadce_files_wasmfs.sent
@@ -1,16 +1,16 @@
-a
-b
-c
-d
-e
-f
-g
-h
-i
-j
-k
-l
-m
-n
-o
-p
+a (emscripten_date_now)
+b (emscripten_err)
+c (getentropy)
+d (emscripten_resize_heap)
+e (emscripten_out)
+f (_wasmfs_stdin_get_char)
+g (_wasmfs_get_preloaded_path_name)
+h (_wasmfs_get_preloaded_parent_path)
+i (_wasmfs_get_preloaded_file_size)
+j (_wasmfs_get_preloaded_file_mode)
+k (_wasmfs_get_preloaded_child_path)
+l (_wasmfs_get_num_preloaded_files)
+m (_wasmfs_get_num_preloaded_dirs)
+n (_wasmfs_copy_preloaded_file_data)
+o (_emscripten_memcpy_js)
+p (_abort_js)
diff --git a/test/other/metadce/test_metadce_hello_O3.exports b/test/other/metadce/test_metadce_hello_O3.exports
@@ -1,4 +1,4 @@
-c
-d
-e
-f
+c (memory)
+d (__wasm_call_ctors)
+e (main)
+f (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_hello_O3.imports b/test/other/metadce/test_metadce_hello_O3.imports
@@ -1,2 +1,2 @@
-a.a
-a.b
+a (fd_write)
+b (_emscripten_memcpy_js)
diff --git a/test/other/metadce/test_metadce_hello_O3.sent b/test/other/metadce/test_metadce_hello_O3.sent
@@ -1,2 +1,2 @@
-a
-b
+a (fd_write)
+b (_emscripten_memcpy_js)
diff --git a/test/other/metadce/test_metadce_hello_Os.exports b/test/other/metadce/test_metadce_hello_Os.exports
@@ -1,4 +1,4 @@
-c
-d
-e
-f
+c (memory)
+d (__wasm_call_ctors)
+e (main)
+f (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_hello_Os.imports b/test/other/metadce/test_metadce_hello_Os.imports
@@ -1,2 +1,2 @@
-a.a
-a.b
+a (fd_write)
+b (_emscripten_memcpy_js)
diff --git a/test/other/metadce/test_metadce_hello_Os.sent b/test/other/metadce/test_metadce_hello_Os.sent
@@ -1,2 +1,2 @@
-a
-b
+a (fd_write)
+b (_emscripten_memcpy_js)
diff --git a/test/other/metadce/test_metadce_hello_Oz.exports b/test/other/metadce/test_metadce_hello_Oz.exports
@@ -1,4 +1,4 @@
-b
-c
-d
-e
+b (memory)
+c (__wasm_call_ctors)
+d (main)
+e (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_hello_Oz.imports b/test/other/metadce/test_metadce_hello_Oz.imports
@@ -1 +1 @@
-a.a
+a (fd_write)
diff --git a/test/other/metadce/test_metadce_hello_Oz.sent b/test/other/metadce/test_metadce_hello_Oz.sent
@@ -1 +1 @@
-a
+a (fd_write)
diff --git a/test/other/metadce/test_metadce_hello_export_nothing.exports b/test/other/metadce/test_metadce_hello_export_nothing.exports
@@ -1,3 +1,3 @@
-a
-b
-c
+a (memory)
+b (__wasm_call_ctors)
+c (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_hello_wasmfs.exports b/test/other/metadce/test_metadce_hello_wasmfs.exports
@@ -1,4 +1,4 @@
-c
-d
-e
-f
+c (memory)
+d (__wasm_call_ctors)
+e (main)
+f (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_hello_wasmfs.imports b/test/other/metadce/test_metadce_hello_wasmfs.imports
@@ -1,2 +1,2 @@
-a.a
-a.b
+a (fd_write)
+b (_emscripten_memcpy_js)
diff --git a/test/other/metadce/test_metadce_hello_wasmfs.sent b/test/other/metadce/test_metadce_hello_wasmfs.sent
@@ -1,2 +1,2 @@
-a
-b
+a (fd_write)
+b (_emscripten_memcpy_js)
diff --git a/test/other/metadce/test_metadce_libcxxabi_message_O3.exports b/test/other/metadce/test_metadce_libcxxabi_message_O3.exports
@@ -1,4 +1,4 @@
-a
-b
-c
-d
+a (memory)
+b (__wasm_call_ctors)
+c (main)
+d (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_mem_O3.exports b/test/other/metadce/test_metadce_mem_O3.exports
@@ -1,5 +1,5 @@
-b
-c
-d
-e
-f
+b (memory)
+c (__wasm_call_ctors)
+d (__main_argc_argv)
+e (__indirect_function_table)
+f (_emscripten_stack_alloc)
diff --git a/test/other/metadce/test_metadce_mem_O3.imports b/test/other/metadce/test_metadce_mem_O3.imports
@@ -1 +1 @@
-a.a
+a (emscripten_resize_heap)
diff --git a/test/other/metadce/test_metadce_mem_O3.sent b/test/other/metadce/test_metadce_mem_O3.sent
@@ -1 +1 @@
-a
+a (emscripten_resize_heap)
diff --git a/test/other/metadce/test_metadce_mem_O3_grow.exports b/test/other/metadce/test_metadce_mem_O3_grow.exports
@@ -1,5 +1,5 @@
-b
-c
-d
-e
-f
+b (memory)
+c (__wasm_call_ctors)
+d (__main_argc_argv)
+e (__indirect_function_table)
+f (_emscripten_stack_alloc)
diff --git a/test/other/metadce/test_metadce_mem_O3_grow.imports b/test/other/metadce/test_metadce_mem_O3_grow.imports
@@ -1 +1 @@
-a.a
+a (emscripten_resize_heap)
diff --git a/test/other/metadce/test_metadce_mem_O3_grow.sent b/test/other/metadce/test_metadce_mem_O3_grow.sent
@@ -1 +1 @@
-a
+a (emscripten_resize_heap)
diff --git a/test/other/metadce/test_metadce_minimal_64.exports b/test/other/metadce/test_metadce_minimal_64.exports
@@ -1,4 +1,4 @@
-a
-b
-c
-d
+a (memory)
+b (__wasm_call_ctors)
+c (add)
+d (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_minimal_O3.exports b/test/other/metadce/test_metadce_minimal_O3.exports
@@ -1,4 +1,4 @@
-a
-b
-c
-d
+a (memory)
+b (__wasm_call_ctors)
+c (add)
+d (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_minimal_Os.exports b/test/other/metadce/test_metadce_minimal_Os.exports
@@ -1,4 +1,4 @@
-a
-b
-c
-d
+a (memory)
+b (__wasm_call_ctors)
+c (add)
+d (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_minimal_Os_mr.exports b/test/other/metadce/test_metadce_minimal_Os_mr.exports
@@ -1,4 +1,4 @@
-a
-b
-c
-d
+a (memory)
+b (__wasm_call_ctors)
+c (add)
+d (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_minimal_Oz-ctors.exports b/test/other/metadce/test_metadce_minimal_Oz-ctors.exports
@@ -1,3 +1,3 @@
-a
-b
-c
+a (memory)
+b (add)
+c (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_minimal_Oz.exports b/test/other/metadce/test_metadce_minimal_Oz.exports
@@ -1,4 +1,4 @@
-a
-b
-c
-d
+a (memory)
+b (__wasm_call_ctors)
+c (add)
+d (__indirect_function_table)
diff --git a/test/other/metadce/test_metadce_minimal_pthreads.exports b/test/other/metadce/test_metadce_minimal_pthreads.exports
@@ -1,17 +1,17 @@
-A
-B
-C
-D
-E
-F
-p
-q
-r
-s
-t
-u
-v
-w
-x
-y
-z
+A (_emscripten_thread_exit)
+B (_emscripten_check_mailbox)
+C (emscripten_stack_set_limits)
+D (_emscripten_stack_restore)
+E (_emscripten_stack_alloc)
+F (emscripten_stack_get_current)
+p (__wasm_call_ctors)
+q (add)
+r (main)
+s (__indirect_function_table)
+t (_emscripten_tls_init)
+u (pthread_self)
+v (_emscripten_proxy_main)
+w (_emscripten_thread_init)
+x (_emscripten_thread_crashed)
+y (_emscripten_run_on_main_thread_js)
+z (_emscripten_thread_free_data)
diff --git a/test/other/metadce/test_metadce_minimal_pthreads.imports b/test/other/metadce/test_metadce_minimal_pthreads.imports
@@ -1,15 +1,15 @@
-a.a
-a.b
-a.c
-a.d
-a.e
-a.f
-a.g
-a.h
-a.i
-a.j
-a.k
-a.l
-a.m
-a.n
-a.o
+a (memory)
+b (emscripten_get_now)
+c (exit)
+d (_emscripten_thread_set_strongref)
+e (fd_write)
+f (emscripten_runtime_keepalive_check)
+g (emscripten_resize_heap)
+h (emscripten_exit_with_live_runtime)
+i (emscripten_check_blocking_allowed)
+j (_emscripten_thread_mailbox_await)
+k (_emscripten_thread_cleanup)
+l (_emscripten_receive_on_main_thread_js)
+m (_emscripten_notify_mailbox_postmessage)
+n (_emscripten_init_main_thread_js)
+o (__pthread_create_js)