Make reactor names available at runtime

core/src/main/java/org/lflang/generator/c/CTriggerObjectsGenerator.java

@@ -1087,6 +1087,60 @@ private static String deferredAllocationForEffectsOnInputs(ReactorInstance react
     return code.toString();
   }
 
+  /**
+   * Set the parent pointer and reactor name. If the reactor is in a bank, the name will be the
+   * instance name with [index] appended.
+   *
+   * @param reactor The reactor instance.
+   */
+  private static String deferredSetParentAndName(ReactorInstance reactor) {
+    var code = new CodeBuilder();
+    if (reactor.isBank()) {
+      // First, generate code to determine the size of the memory needed for the name.
+      code.pr("char* format = \"%s[%d]\";");
+      code.pr(
+          "int length = snprintf(NULL, 0, format, \""
+              + reactor.getName()
+              + "\", "
+              + CUtil.bankIndexName(reactor)
+              + ");\n");
+      code.pr(
+          CUtil.reactorRef(reactor)
+              + "->base.name = (char*)lf_allocate(length + 1, sizeof(char),"
+              + " (allocation_record_t**)&((self_base_t*)"
+              + CUtil.reactorRef(reactor)
+              + ")->allocations);");
+      code.pr(
+          "if("
+              + CUtil.reactorRef(reactor)
+              + "->base.name != NULL) {"); // Will be NULL if lf_allocate fails.
+      code.indent();
+      code.pr(
+          "snprintf("
+              + CUtil.reactorRef(reactor)
+              + "->base.name, length + 1, format, \""
+              + reactor.getName()
+              + "\", "
+              + CUtil.bankIndexName(reactor)
+              + ");");
+      code.unindent();
+      code.pr("}");
+    } else {
+      code.pr(CUtil.reactorRef(reactor) + "->base.name = \"" + reactor.getName() + "\";");
+    }
+    ReactorInstance parent = reactor.getParent();
+    if (parent == null) {
+      code.pr(CUtil.reactorRef(reactor) + "->base.parent = (self_base_t*)NULL;");
+    } else {
+      code.pr(
+          CUtil.reactorRef(reactor)
+              + "->base.parent = (self_base_t*)"
+              + CUtil.reactorRef(parent)
+              + ";");
+    }
+    return code.toString();
+  }
+
   /**
    * Perform initialization functions that must be performed after all reactor runtime instances
    * have been created. This function creates nested loops over nested banks.
@@ -1104,6 +1158,9 @@ private static String deferredInitialize(
     // over bank members for the reactor's parent.
     code.startScopedBlock(reactor);
 
+    // Set the parent pointer and name for the reactor.
+    code.pr(deferredSetParentAndName(reactor));
+
     // If the child has a multiport that is an effect of some reaction in its container,
     // then we have to generate code to allocate memory for arrays pointing to
     // its data. If the child is a bank, then memory is allocated for the entire

test/C/src/ReactorName.lf

@@ -0,0 +1,58 @@
+target C {
+  build-type: debug
+}
+
+preamble {=
+  #include <string.h>
+=}
+
+reactor A(parent_bank_index: size_t = 0) {
+  reaction(startup) {=
+    const char* name = lf_reactor_full_name(self);
+    lf_print("name: %s", name);
+    char buffer[20];
+    snprintf(buffer, 20, "ReactorName.b[%zu].a", self->parent_bank_index);
+    if (strcmp(buffer, name) != 0) {
+      lf_print_error_and_exit("full name does not match");
+    }
+    name = lf_reactor_name(self);
+    if (strcmp("a", name) != 0) {
+      lf_print_error_and_exit("name does not match");
+    }
+  =}
+}
+
+reactor B(bank_index: size_t = 0) {
+  a = new A(parent_bank_index=bank_index)
+
+  reaction(startup) {=
+    const char* name = lf_reactor_full_name(self);
+    lf_print("name: %s", name);
+    char buffer[20];
+    snprintf(buffer, 20, "ReactorName.b[%zu]", self->bank_index);
+    if (strcmp(buffer, name) != 0) {
+      lf_print_error_and_exit("full name does not match");
+    }
+    name = lf_reactor_name(self);
+    snprintf(buffer, 20, "b[%zu]", self->bank_index);
+    if (strcmp(buffer, name) != 0) {
+      lf_print_error_and_exit("name does not match");
+    }
+  =}
+}
+
+main reactor {
+  b = new[3] B()
+
+  reaction(startup) {=
+    const char* name = lf_reactor_full_name(self);
+    lf_print("name: %s", name);
+    if (strcmp("ReactorName", name) != 0) {
+      lf_print_error_and_exit("full name does not match");
+    }
+    name = lf_reactor_name(self);
+    if (strcmp("ReactorName", name) != 0) {
+      lf_print_error_and_exit("name does not match");
+    }
+  =}
+}