Handle missing procedures better

src/llvm_backend.cpp

@@ -12,7 +12,7 @@
 #endif
 
 #ifndef LLVM_WEAK_MONOMORPHIZATION
-#define LLVM_WEAK_MONOMORPHIZATION build_context.internal_weak_monomorphization
+#define LLVM_WEAK_MONOMORPHIZATION 1
 #endif
 
 
@@ -2478,8 +2478,14 @@ gb_internal void lb_generate_procedures(lbGenerator *gen, bool do_threading) {
 gb_internal WORKER_TASK_PROC(lb_generate_missing_procedures_to_check_worker_proc) {
 	lbModule *m = cast(lbModule *)data;
 	for (lbProcedure *p = nullptr; mpsc_dequeue(&m->missing_procedures_to_check, &p); /**/) {
-		debugf("Generate missing procedure: %.*s module %p\n", LIT(p->name), m);
-		lb_generate_procedure(m, p);
+		if (!p->is_done.load(std::memory_order_relaxed)) {
+			debugf("Generate missing procedure: %.*s module %p\n", LIT(p->name), m);
+			lb_generate_procedure(m, p);
+		}
+
+		for (lbProcedure *nested = nullptr; mpsc_dequeue(&m->procedures_to_generate, &nested); /**/) {
+			mpsc_enqueue(&m->missing_procedures_to_check, nested);
+		}
 	}
 	return 0;
 }
@@ -2860,7 +2866,7 @@ gb_internal lbProcedure *lb_create_main_procedure(lbModule *m, lbProcedure *star
 }
 
 gb_internal void lb_generate_procedure(lbModule *m, lbProcedure *p) {
-	if (p->is_done) {
+	if (p->is_done.load(std::memory_order_relaxed)) {
 		return;
 	}
 
@@ -2869,7 +2875,7 @@ gb_internal void lb_generate_procedure(lbModule *m, lbProcedure *p) {
 		lb_begin_procedure_body(p);
 		lb_build_stmt(p, p->body);
 		lb_end_procedure_body(p);
-		p->is_done = true;
+		p->is_done.store(true, std::memory_order_relaxed);
 		m->curr_procedure = nullptr;
 	} else if (p->generate_body != nullptr) {
 		p->generate_body(m, p);

src/llvm_backend.hpp

@@ -366,9 +366,9 @@ struct lbProcedure {
 
 	lbFunctionType *abi_function_type;
 
-	LLVMValueRef    value;
-	LLVMBuilderRef  builder;
-	bool            is_done;
+	LLVMValueRef      value;
+	LLVMBuilderRef    builder;
+	std::atomic<bool> is_done;
 
 	lbAddr           return_ptr;
 	Array<lbDefer>   defer_stmts;

src/llvm_backend_general.cpp

@@ -3082,9 +3082,12 @@ gb_internal lbValue lb_find_procedure_value_from_entity(lbModule *m, Entity *e)
 		if (found == nullptr) {
 			// THIS IS THE RACE CONDITION
 			lbProcedure *missing_proc_in_other_module = lb_create_procedure(other_module, e, false);
-			mpsc_enqueue(&other_module->missing_procedures_to_check, missing_proc_in_other_module);
+			if (!missing_proc_in_other_module->is_done.load(std::memory_order_relaxed)) {
+				mpsc_enqueue(&other_module->missing_procedures_to_check, missing_proc_in_other_module);
+			}
 		}
 	} else {
+		GB_PANIC("missing procedure: %.*s", LIT(missing_proc->name));
 		mpsc_enqueue(&m->missing_procedures_to_check, missing_proc);
 	}
 
@@ -3157,7 +3160,9 @@ gb_internal lbValue lb_generate_anonymous_proc_lit(lbModule *m, String const &pr
 		rw_mutex_shared_unlock(&target_module->values_mutex);
 		if (found == nullptr) {
 			lbProcedure *missing_proc_in_target_module = lb_create_procedure(target_module, e, false);
-			mpsc_enqueue(&target_module->missing_procedures_to_check, missing_proc_in_target_module);
+			if (!missing_proc_in_target_module->is_done.load(std::memory_order_relaxed)) {
+				mpsc_enqueue(&target_module->missing_procedures_to_check, missing_proc_in_target_module);
+			}
 		}
 
 		lbProcedure *p = lb_create_procedure(m, e, true);

src/llvm_backend_proc.cpp

@@ -99,7 +99,6 @@ gb_internal lbProcedure *lb_create_procedure(lbModule *m, Entity *entity, bool i
 		}
 	}
 
-
 	lbProcedure *p = gb_alloc_item(permanent_allocator(), lbProcedure);
 
 	p->module = m;