Make WASM export names different across modules

The export name is now ${TARGET_NAME}Entry. This can also be overridden
by using QT_WASM_EXPORT_NAME, both in CMake and qmake

Change-Id: I59c97ae6e22f0b2720716e9d7eff7b6b13d37ab5
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

18 files changed, 82 insertions, 46 deletions

diff --git a/cmake/QtWasmHelpers.cmake b/cmake/QtWasmHelpers.cmake
index 3eb97fa3cb..2b3a97987f 100644
--- a/cmake/QtWasmHelpers.cmake
+++ b/cmake/QtWasmHelpers.cmake
@@ -18,14 +18,9 @@ function (qt_internal_setup_wasm_target_properties wasmTarget)
         target_compile_options("${wasmTarget}" INTERFACE "SHELL:-s MEMORY64=1" )
         target_link_options("${wasmTarget}" INTERFACE   "SHELL:-s MEMORY64=1" -mwasm64)
     endif()
-    # Enable MODULARIZE and set EXPORT_NAME, which makes it possible to
-    # create application instances using a global constructor function,
-    # e.g. let app_instance = await createQtAppInstance().
-    # (as opposed to MODULARIZE=0, where Emscripten creates a global app
-    # instance object at Javascript eval time)
-    target_link_options("${wasmTarget}" INTERFACE
-    "SHELL:-s MODULARIZE=1"
-    "SHELL:-s EXPORT_NAME=createQtAppInstance")
+    # Enable MODULARIZE so that we are able to set EXPORT_NAME later and instantiate on demand (with
+    # MODULARIZE=0, emscripten creates a global app instance object at Javascript eval time)
+    target_link_options("${wasmTarget}" INTERFACE "SHELL:-s MODULARIZE=1")
 
     #simd
     if (QT_FEATURE_wasm_simd128)
@@ -126,6 +121,7 @@ function (qt_internal_setup_wasm_target_properties wasmTarget)
 endfunction()
 
 function(qt_internal_wasm_add_finalizers target)
+    qt_add_list_file_finalizer(_qt_internal_set_wasm_export_name ${target})
     qt_add_list_file_finalizer(_qt_internal_add_wasm_extra_exported_methods ${target})
     qt_add_list_file_finalizer(_qt_internal_wasm_add_target_helpers ${target})
 endfunction()
diff --git a/mkspecs/common/wasm/wasm.conf b/mkspecs/common/wasm/wasm.conf
index b67d721352..adad999200 100644
--- a/mkspecs/common/wasm/wasm.conf
+++ b/mkspecs/common/wasm/wasm.conf
@@ -35,7 +35,6 @@ EMCC_COMMON_LFLAGS += \
     --bind \
     -s FETCH=1 \
     -s MODULARIZE=1 \
-    -s EXPORT_NAME=createQtAppInstance \
     -s WASM_BIGINT=1 \
     -s STACK_SIZE=5MB
 
diff --git a/mkspecs/features/wasm/wasm.prf b/mkspecs/features/wasm/wasm.prf
index 0256fc2e49..72007fe863 100644
--- a/mkspecs/features/wasm/wasm.prf
+++ b/mkspecs/features/wasm/wasm.prf
@@ -15,6 +15,13 @@ exists($$QMAKE_QT_CONFIG) {
     }
     EMCC_LFLAGS += -s EXPORTED_RUNTIME_METHODS=$$EXPORTED_METHODS
 
+    !isEmpty(QT_WASM_EXPORT_NAME): {
+        EXPORT_NAME = $$QT_WASM_EXPORT_NAME
+    } else {
+        EXPORT_NAME = $${TARGET}_entry
+    }
+    EMCC_LFLAGS += -s EXPORT_NAME=$$EXPORT_NAME
+
     qtConfig(thread) {
 
         EMCC_LFLAGS += -pthread
diff --git a/src/corelib/Qt6CoreMacros.cmake b/src/corelib/Qt6CoreMacros.cmake
index abffd2026e..3347f39829 100644
--- a/src/corelib/Qt6CoreMacros.cmake
+++ b/src/corelib/Qt6CoreMacros.cmake
@@ -656,6 +656,7 @@ function(_qt_internal_finalize_executable target)
     if(EMSCRIPTEN)
         _qt_internal_wasm_add_target_helpers("${target}")
         _qt_internal_add_wasm_extra_exported_methods("${target}")
+        _qt_internal_set_wasm_export_name("${target}")
     endif()
     if(IOS)
         _qt_internal_finalize_ios_app("${target}")
diff --git a/src/corelib/Qt6WasmMacros.cmake b/src/corelib/Qt6WasmMacros.cmake
index 6e004dc862..188ed28fe4 100644
--- a/src/corelib/Qt6WasmMacros.cmake
+++ b/src/corelib/Qt6WasmMacros.cmake
@@ -104,3 +104,12 @@ function(_qt_internal_add_wasm_extra_exported_methods target)
         )
     endif()
 endfunction()
+
+function(_qt_internal_set_wasm_export_name target)
+    get_target_property(export_name "${target}" QT_WASM_EXPORT_NAME)
+    if(export_name)
+        target_link_options("${target}" PRIVATE "SHELL:-s EXPORT_NAME=${export_name}")
+    else()
+        target_link_options("${target}" PRIVATE "SHELL:-s EXPORT_NAME=${target}_entry")
+    endif()
+endfunction()
diff --git a/src/plugins/platforms/wasm/qtloader.js b/src/plugins/platforms/wasm/qtloader.js
index c62b3f8823..1d1e7fb6d1 100644
--- a/src/plugins/platforms/wasm/qtloader.js
+++ b/src/plugins/platforms/wasm/qtloader.js
@@ -49,7 +49,7 @@ async function qtLoad(config)
     if (typeof config.qt !== 'object')
         throw new Error('config.qt is required, expected an object');
     if (typeof config.qt.entryFunction !== 'function')
-        config.qt.entryFunction = window.createQtAppInstance;
+        throw new Error('config.qt.entryFunction is required, expected a function');
 
     config.qtContainerElements = config.qt.containerElements;
     delete config.qt.containerElements;
diff --git a/src/plugins/platforms/wasm/wasm_shell.html b/src/plugins/platforms/wasm/wasm_shell.html
index 9924890122..2287e3fad2 100644
--- a/src/plugins/platforms/wasm/wasm_shell.html
+++ b/src/plugins/platforms/wasm/wasm_shell.html
@@ -57,7 +57,7 @@
                                 exitData.text !== undefined ? ` (${exitData.text})` : '';
                             showUi(spinner);
                         },
-                        entryFunction: window.createQtAppInstance,
+                        entryFunction: window.@APPNAME@_entry,
                         containerElements: [screen],
                     }
                 });
diff --git a/tests/manual/wasm/a11y/basic_widgets/basic_widgets.html b/tests/manual/wasm/a11y/basic_widgets/basic_widgets.html
index 899e72bb00..091809be5c 100644
--- a/tests/manual/wasm/a11y/basic_widgets/basic_widgets.html
+++ b/tests/manual/wasm/a11y/basic_widgets/basic_widgets.html
@@ -7,7 +7,7 @@
 
 <script>
     window.onload = async () => {
-        let qt_instance = await createQtAppInstance({
+        let qt_instance = await a11y_basic_widgets_entry({
             qtContainerElements: [document.getElementById("qt_container")],
         });
     }
diff --git a/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto.html b/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto.html
index 7ff9d8e7f2..e8e35abcbb 100644
--- a/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto.html
+++ b/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto.html
@@ -3,7 +3,7 @@
 <script type="text/javascript" src="eventloop_auto.js"></script>
 <script>
     window.onload = () => {
-        runTestCase(document.getElementById("log"));
+        runTestCase(eventloop_auto_entry, document.getElementById("log"));
     };
 </script>
 <p>Running event dispatcher auto test.</p>
diff --git a/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto_asyncify.html b/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto_asyncify.html
index a277c9b9e0..f09b29d85b 100644
--- a/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto_asyncify.html
+++ b/tests/manual/wasm/eventloop/eventloop_auto/eventloop_auto_asyncify.html
@@ -3,7 +3,7 @@
 <script type="text/javascript" src="eventloop_auto_asyncify.js"></script>
 <script>
     window.onload = () => {
-        runTestCase(document.getElementById("log"));
+        runTestCase(eventloop_auto_asyncify_entry, document.getElementById("log"));
     };
 </script>
 <p>Running event dispatcher auto test.</p>
diff --git a/tests/manual/wasm/network/sockify_sockets_auto/sockify_sockets_auto.html b/tests/manual/wasm/network/sockify_sockets_auto/sockify_sockets_auto.html
index 5376249a71..080ada94e7 100644
--- a/tests/manual/wasm/network/sockify_sockets_auto/sockify_sockets_auto.html
+++ b/tests/manual/wasm/network/sockify_sockets_auto/sockify_sockets_auto.html
@@ -3,7 +3,7 @@
 <script type="text/javascript" src="sockify_sockets_auto.js"></script>
 <script>
     window.onload = async () => {
-        runTestCase(document.getElementById("log"));
+        runTestCase(sockify_sockets_auto_entry, document.getElementById("log"));
     };
 </script>
 <p> Sockify tunneled sockets auto test.
diff --git a/tests/manual/wasm/qstdweb/files_auto.html b/tests/manual/wasm/qstdweb/files_auto.html
index 71e8088dfb..9027fdc660 100644
--- a/tests/manual/wasm/qstdweb/files_auto.html
+++ b/tests/manual/wasm/qstdweb/files_auto.html
@@ -6,7 +6,7 @@
 <script type="text/javascript" src="files_auto.js"></script>
 <script>
     window.onload = () => {
-        runTestCase(document.getElementById("log"));
+        runTestCase(files_auto_entry, document.getElementById("log"));
     };
 </script>
 <p>Running files auto test.</p>
diff --git a/tests/manual/wasm/qstdweb/promise_auto.html b/tests/manual/wasm/qstdweb/promise_auto.html
index 786145419f..94a8dbb88a 100644
--- a/tests/manual/wasm/qstdweb/promise_auto.html
+++ b/tests/manual/wasm/qstdweb/promise_auto.html
@@ -3,7 +3,7 @@
 <script type="text/javascript" src="promise_auto.js"></script>
 <script>
     window.onload = () => {
-        runTestCase(document.getElementById("log"));
+        runTestCase(promise_auto_entry, document.getElementById("log"));
     };
 </script>
 <p>Running promise auto test.</p>
diff --git a/tests/manual/wasm/qstdweb/qwasmcompositor_auto.html b/tests/manual/wasm/qstdweb/qwasmcompositor_auto.html
index 26daecdf41..f33aab0b9c 100644
--- a/tests/manual/wasm/qstdweb/qwasmcompositor_auto.html
+++ b/tests/manual/wasm/qstdweb/qwasmcompositor_auto.html
@@ -3,7 +3,7 @@
 <script type="text/javascript" src="qwasmcompositor_auto.js"></script>
 <script>
     window.onload = () => {
-        runTestCase(document.getElementById("log"));
+        runTestCase(qwasmcompositor_auto_entry, document.getElementById("log"));
     };
 </script>
 <p>Running files auto test.</p>
diff --git a/tests/manual/wasm/qtloader_integration/test_body.js b/tests/manual/wasm/qtloader_integration/test_body.js
index d68c6ba8cc..385a3816d3 100644
--- a/tests/manual/wasm/qtloader_integration/test_body.js
+++ b/tests/manual/wasm/qtloader_integration/test_body.js
@@ -48,10 +48,32 @@ export class QtLoaderIntegrationTests
             'config.qt is required, expected an object', caughtException.message);
     }
 
-    async useDefaultOnMissingEntryFunction()
+    async missingEntryFunction()
     {
-        const instance = await qtLoad({ arguments: ['--no-gui'], qt: {}});
-        assert.isNotUndefined(instance);
+        let caughtException;
+        try {
+            await qtLoad({ qt: {}});
+        } catch (e) {
+            caughtException = e;
+        }
+
+        assert.isNotUndefined(caughtException);
+        assert.equal(
+            'config.qt.entryFunction is required, expected a function', caughtException.message);
+    }
+
+    async badEntryFunction()
+    {
+        let caughtException;
+        try {
+            await qtLoad({ qt: { entryFunction: 'invalid' }});
+        } catch (e) {
+            caughtException = e;
+        }
+
+        assert.isNotUndefined(caughtException);
+        assert.equal(
+            'config.qt.entryFunction is required, expected a function', caughtException.message);
     }
 
     async environmentVariables()
@@ -62,7 +84,7 @@ export class QtLoaderIntegrationTests
                     variable1: 'value1',
                     variable2: 'value2'
                 },
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
                 containerElements: [this.#testScreenContainers[0]]
             }
         });
@@ -79,7 +101,7 @@ export class QtLoaderIntegrationTests
 
         const instance = await qtLoad({
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
                 containerElements: this.#testScreenContainers
             }
         });
@@ -125,7 +147,7 @@ export class QtLoaderIntegrationTests
     {
         const instance = await qtLoad({
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
                 containerElements: this.#testScreenContainers,
             }
         });
@@ -181,7 +203,7 @@ export class QtLoaderIntegrationTests
 
         const instances = await Promise.all([1, 2, 3].map(i => qtLoad({
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
                 containerElements: [this.#addScreenContainer(`screen-container-${i}`, {
                     width: `${i * 10}px`,
                     height: `${i * 10}px`,
@@ -222,7 +244,7 @@ export class QtLoaderIntegrationTests
                 accumulatedStdout += output;
             },
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
             }
         });
 
@@ -246,7 +268,7 @@ export class QtLoaderIntegrationTests
     {
         await qtLoad({
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
                 containerElements: [this.#testScreenContainers[0]],
                 module: await WebAssembly.compileStreaming(
                     fetch('tst_qtloader_integration.wasm'))
@@ -259,7 +281,7 @@ export class QtLoaderIntegrationTests
         const instance = await qtLoad({
             arguments: ['--no-gui', 'arg1', 'other', 'yetanotherarg'],
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
             }
         });
         const args = this.#callTestInstanceApi(instance, 'retrieveArguments');
@@ -275,7 +297,7 @@ export class QtLoaderIntegrationTests
         try {
             await qtLoad({
                 qt: {
-                    entryFunction: createQtAppInstance,
+                    entryFunction: tst_qtloader_integration_entry,
                     containerElements: [this.#testScreenContainers[0]],
                     module: Promise.reject(new Error('Failed to load')),
                 }
@@ -294,7 +316,7 @@ export class QtLoaderIntegrationTests
             arguments: ['--no-gui'],
             qt: {
                 onExit: onExitMock,
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
             }
         });
         try {
@@ -316,7 +338,7 @@ export class QtLoaderIntegrationTests
                 arguments: ['--no-gui', '--crash-immediately'],
                 qt: {
                     onExit: onExitMock,
-                    entryFunction: createQtAppInstance,
+                    entryFunction: tst_qtloader_integration_entry,
                 }
             });
         } catch (e) {
@@ -340,7 +362,7 @@ export class QtLoaderIntegrationTests
             arguments: ['--no-gui'],
             onAbort: onAbortMock,
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
             }
         });
         try {
@@ -358,7 +380,7 @@ export class QtLoaderIntegrationTests
             arguments: ['--no-gui'],
             qt: {
                 onExit: onExitMock,
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
             }
         });
         // The module is running. onExit should not have been called.
@@ -383,7 +405,7 @@ export class QtLoaderIntegrationTests
             arguments: ['--no-gui', '--exit-immediately'],
             qt: {
                 onExit: onExitMock,
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
             }
         });
         assert.equal(1, onExitMock.calls.length);
@@ -402,7 +424,7 @@ export class QtLoaderIntegrationTests
             arguments: ['--no-gui'],
             quit: quitMock,
             qt: {
-                entryFunction: createQtAppInstance,
+                entryFunction: tst_qtloader_integration_entry,
             }
         });
         try {
diff --git a/tests/manual/wasm/qtwasmtestlib/README.md b/tests/manual/wasm/qtwasmtestlib/README.md
index 515c33ae6a..6de81fe8b4 100644
--- a/tests/manual/wasm/qtwasmtestlib/README.md
+++ b/tests/manual/wasm/qtwasmtestlib/README.md
@@ -48,7 +48,7 @@ Finally provide an html file which hosts the test runner and calls runTestCase()
     <script type="text/javascript" src="test_case.js"></script>
     <script>
         window.onload = async () => {
-            runTestCase(document.getElementById("log"));
+            runTestCase(entryFunction, document.getElementById("log"));
         };
     </script>
     <p>Running Foo auto test.</p>
@@ -67,7 +67,7 @@ html file provides container elements which becomes QScreens for the test code.
         window.onload = async () => {
             let log = document.getElementById("log")
             let containers = [document.getElementById("container")];
-            runTestCase(log, containers);
+            runTestCase(entryFunction, log, containers);
         };
     </script>
     <p>Running Foo auto test.</p>
diff --git a/tests/manual/wasm/qtwasmtestlib/qtwasmtestlib.js b/tests/manual/wasm/qtwasmtestlib/qtwasmtestlib.js
index eaf518d1ef..01003f30f9 100644
--- a/tests/manual/wasm/qtwasmtestlib/qtwasmtestlib.js
+++ b/tests/manual/wasm/qtwasmtestlib/qtwasmtestlib.js
@@ -77,12 +77,13 @@ async function runTestFunction(instance, name) {
     }
 }
 
-async function runTestCaseImpl(testFunctionStarted, testFunctionCompleted, qtContainers) {
+async function runTestCaseImpl(entryFunction, testFunctionStarted, testFunctionCompleted, qtContainers)
+{
     // Create test case instance
     const config = {
         qtContainerElements: qtContainers || []
     }
-    const instance = await createQtAppInstance(config);
+    const instance = await entryFunction(config);
 
     // Run all test functions
     const functionsString = instance.getTestFunctions();
@@ -124,10 +125,11 @@ function testFunctionCompleted(status) {
     g_htmlLogElement.innerHTML += line;
 }
 
-async function runTestCase(htmlLogElement, qtContainers) {
+async function runTestCase(entryFunction, htmlLogElement, qtContainers)
+{
     g_htmlLogElement = htmlLogElement;
     try {
-        await runTestCaseImpl(testFunctionStarted, testFunctionCompleted, qtContainers);
+        await runTestCaseImpl(entryFunction, testFunctionStarted, testFunctionCompleted, qtContainers);
         g_htmlLogElement.innerHTML += "<br> DONE"
     } catch (err) {
         g_htmlLogElement.innerHTML += err
diff --git a/util/wasm/batchedtestrunner/qwasmjsruntime.js b/util/wasm/batchedtestrunner/qwasmjsruntime.js
index b8603f2618..d973914cd3 100644
--- a/util/wasm/batchedtestrunner/qwasmjsruntime.js
+++ b/util/wasm/batchedtestrunner/qwasmjsruntime.js
@@ -109,18 +109,18 @@ export class CompiledModule {
         this.#resourceLocator = resourceLocator;
     }
 
-    static make(js, wasm, resourceLocator
+    static make(js, wasm, entryFunctionName, resourceLocator
     ) {
         const exports = {};
         eval(js);
-        if (!exports.createQtAppInstance) {
+        if (!exports[entryFunctionName]) {
             throw new Error(
-                'createQtAppInstance has not been exported by the main script'
+                '${entryFunctionName} has not been exported by the main script'
             );
         }
 
         return new CompiledModule(
-            exports.createQtAppInstance, js, wasm, resourceLocator
+            exports[entryFunctionName], js, wasm, resourceLocator
         );
     }
 
@@ -218,6 +218,6 @@ export class ModuleLoader {
         );
 
         const [js, wasm] = await Promise.all([jsLoadPromise, wasmLoadPromise]);
-        return CompiledModule.make(js, wasm, this.#resourceLocator);
+        return CompiledModule.make(js, wasm, `${moduleName}_entry`, this.#resourceLocator);
     }
 }