systemc: Don't depend on the order of static initializers.

STL containers may need to be constructed before they're used. Don't
count on being able to insert into them during a static initializer.

Change-Id: Icb05d5084a470e1ebd976ae6e1954b1a78aabd6a
Reviewed-on: https://gem5-review.googlesource.com/c/13329
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/core/python.cc

@@ -40,14 +40,25 @@ namespace sc_gem5
 namespace
 {
 
-std::vector<PythonReadyFunc *> pythonReadyFuncs;
-std::vector<PythonInitFunc *> pythonInitFuncs;
+PythonReadyFunc *&
+firstReadyFunc()
+{
+    static PythonReadyFunc *first = nullptr;
+    return first;
+}
+
+PythonInitFunc *&
+firstInitFunc()
+{
+    static PythonInitFunc *first = nullptr;
+    return first;
+}
 
 void
 python_ready(pybind11::args args)
 {
-    for (auto &func: pythonReadyFuncs)
-        func->run();
+    for (auto ptr = firstReadyFunc(); ptr; ptr = ptr->next)
+        ptr->run();
 }
 
 void
@@ -55,21 +66,21 @@ systemc_pybind(pybind11::module &m_internal)
 {
     pybind11::module m = m_internal.def_submodule("systemc");
     m.def("python_ready", &python_ready);
-    for (auto &func: pythonInitFuncs)
-        func->run(m);
+    for (auto ptr = firstInitFunc(); ptr; ptr = ptr->next)
+        ptr->run(m);
 }
 EmbeddedPyBind embed_("systemc", &systemc_pybind);
 
 } // anonymous namespace
 
-PythonReadyFunc::PythonReadyFunc()
+PythonReadyFunc::PythonReadyFunc() : next(firstReadyFunc())
 {
-    pythonReadyFuncs.push_back(this);
+    firstReadyFunc() = this;
 }
 
-PythonInitFunc::PythonInitFunc()
+PythonInitFunc::PythonInitFunc() : next(firstInitFunc())
 {
-    pythonInitFuncs.push_back(this);
+    firstInitFunc() = this;
 }
 
 } // namespace sc_gem5

src/systemc/core/python.hh

@@ -37,6 +37,8 @@ namespace sc_gem5
 
 struct PythonReadyFunc
 {
+    PythonReadyFunc *next;
+
     PythonReadyFunc();
     ~PythonReadyFunc() {}
     virtual void run() = 0;
@@ -44,6 +46,8 @@ struct PythonReadyFunc
 
 struct PythonInitFunc
 {
+    PythonInitFunc *next;
+
     PythonInitFunc();
     ~PythonInitFunc() {}
     virtual void run(pybind11::module &systemc) = 0;

src/systemc/utils/report.cc

@@ -29,6 +29,8 @@
 
 #include "systemc/utils/report.hh"
 
+#include "systemc/core/python.hh"
+
 namespace sc_gem5
 {
 
@@ -63,11 +65,42 @@ std::unique_ptr<sc_core::sc_report> globalReportCache;
 
 bool reportWarningsAsErrors = false;
 
-DefaultReportMessages::DefaultReportMessages(
-        std::initializer_list<std::pair<int, const char *>> msgs)
+DefaultReportMessages *&
+DefaultReportMessages::top()
+{
+    static DefaultReportMessages *top_ptr = nullptr;
+    return top_ptr;
+}
+
+void
+DefaultReportMessages::install()
 {
     for (auto &p: msgs)
         sc_core::sc_report::register_id(p.first, p.second);
 }
 
+DefaultReportMessages::DefaultReportMessages(
+        std::initializer_list<std::pair<int, const char *>> msgs) :
+    next(top()), msgs(msgs)
+{
+    top() = this;
+}
+
+void
+DefaultReportMessages::installAll()
+{
+    for (DefaultReportMessages *ptr = top(); ptr; ptr = ptr->next)
+        ptr->install();
+}
+
+namespace
+{
+
+struct InstallDefaultReportMessages : public PythonReadyFunc
+{
+    void run() override { DefaultReportMessages::installAll(); }
+} messageInstaller;
+
+} // anonymous namespace
+
 } // namespace sc_gem5

src/systemc/utils/report.hh

@@ -110,8 +110,17 @@ extern bool reportWarningsAsErrors;
 
 struct DefaultReportMessages
 {
+  protected:
+    static DefaultReportMessages *&top();
+    DefaultReportMessages *next;
+
+    std::initializer_list<std::pair<int, const char *>> msgs;
+    void install();
+
   public:
     DefaultReportMessages(std::initializer_list<std::pair<int, const char *>>);
+
+    static void installAll();
 };
 
 } // namespace sc_gem5