[Feat, Perf, Test] (MG_Util, MG_Backend, MG_Test): test-lane SPIR-V validation latch; entry-local Private rewrite, in-chain rect lowering and uniform-Location strip

MobileGL/MG_Util/Async/ShaderCompilePool.cpp

@@ -54,9 +54,7 @@ namespace MobileGL::MG_Util::Async {
                     // calling eglTerminate, which is the norm for a test binary and legal
                     // for an application. Registered here, during main, so it runs before
                     // the destructors of statics constructed at load time.
-                    if (ShaderCompilePool* pool = g_processPool.load(std::memory_order_acquire)) {
-                        pool->StopAndDrain();
-                    }
+                    ShaderCompilePool::StopAndDrainProcessPoolAtExit();
                 });
             });
         }
@@ -345,4 +343,10 @@ namespace MobileGL::MG_Util::Async {
         // eglInitialize to get its worker threads back, the re-arm belongs in
         // MobileGL::Initialize(), next to glslang::InitializeProcess().
     }
+
+    void ShaderCompilePool::StopAndDrainProcessPoolAtExit() {
+        if (ShaderCompilePool* pool = g_processPool.load(std::memory_order_acquire)) {
+            pool->StopAndDrain();
+        }
+    }
 } // namespace MobileGL::MG_Util::Async

MobileGL/MG_Util/Async/ShaderCompilePool.h

@@ -109,6 +109,13 @@ namespace MobileGL::MG_Util::Async {
         // but they share glslang's process globals, which teardown is about to free.
         void StopAndDrain();
 
+        // StopAndDrain() on the process-wide pool if one was ever created; never creates
+        // one. For extra atexit sentinels owned by other subsystems (the SPIR-V validation
+        // switch registers one after forcing spirv-tools' lazy function-local tables into
+        // existence, so the drain is sequenced before those tables' destructors - a worker
+        // mid-Validate would otherwise touch freed memory during process exit).
+        static void StopAndDrainProcessPoolAtExit();
+
         Uint GetThreadCount() const;
         Uint GetMaxConcurrency() const;