From 273a322f918de93d5b19c908ecd4b556fb77f155 Mon Sep 17 00:00:00 2001
From: Gabriel Ionita <d9rect@pm.me>
Date: Fri, 24 Oct 2025 18:50:00 +0100
Subject: [PATCH] add function to list global integer variables

---
 src/symbol.cpp | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/src/symbol.cpp b/src/symbol.cpp
index ebac652..33f6f51 100644
--- a/src/symbol.cpp
+++ b/src/symbol.cpp
@@ -115,3 +115,81 @@ Dwarf_Addr Symbol::get_global_var_addr(Dwarf_Debug dbg, Dwarf_Die die) {
   dwarf_dealloc(dbg, loc_attr, DW_DLA_ATTR);
   return addr;
 }
+
+void Symbol::list_global_integer_vars(Dwarf_Debug dbg) {
+  Dwarf_Error err;
+  Dwarf_Unsigned cu_hdr_len, abbr_offset, next_cu_hdr;
+  Dwarf_Half ver_stamp, addr_sz;
+  Dwarf_Half length_size, extension_size;
+  Dwarf_Sig8 type_signature;
+  Dwarf_Unsigned typeoffset;
+  Dwarf_Half header_cu_type;
+
+  std::cout << "Global integer variables:" << std::endl;
+  std::cout << std::string(50, '-') << std::endl;
+
+  // Iterate through all compilation units
+  while (dwarf_next_cu_header_d(dbg, true, &cu_hdr_len, &ver_stamp, &abbr_offset,
+                                &addr_sz, &length_size, &extension_size,
+                                &type_signature, &typeoffset, &next_cu_hdr,
+                                &header_cu_type, &err) == DW_DLV_OK) {
+
+    Dwarf_Die cu_die = nullptr;
+
+    // Get the compilation unit DIE
+    if (dwarf_siblingof_b(dbg, nullptr, true, &cu_die, &err) != DW_DLV_OK)
+      continue;
+
+    // Get the first child DIE
+    Dwarf_Die child_die = nullptr;
+    if (dwarf_child(cu_die, &child_die, &err) != DW_DLV_OK) {
+      dwarf_dealloc(dbg, cu_die, DW_DLA_DIE);
+      continue;
+    }
+
+    // Iterate through all child DIEs
+    while (child_die != nullptr) {
+      Dwarf_Half tag;
+
+      if (dwarf_tag(child_die, &tag, &err) == DW_DLV_OK && tag == DW_TAG_variable) {
+        // Check if it's a global variable (has DW_AT_external)
+        Dwarf_Attribute external_attr;
+        Dwarf_Bool is_external;
+
+        bool is_global = false;
+        if (dwarf_attr(child_die, DW_AT_external, &external_attr, &err) == DW_DLV_OK) {
+          if (dwarf_formflag(external_attr, &is_external, &err) == DW_DLV_OK && is_external) {
+            is_global = true;
+          }
+          dwarf_dealloc(dbg, external_attr, DW_DLA_ATTR);
+        }
+
+        // Process global integer variables
+        if (is_global && is_integer_type(dbg, child_die)) {
+          char *var_name = nullptr;
+
+          if (dwarf_diename(child_die, &var_name, &err) == DW_DLV_OK && var_name) {
+            Dwarf_Addr addr = get_global_var_addr(dbg, child_die);
+
+            std::cout << std::format("Variable: {:<30} Address: 0x{:x}",
+                                    var_name, addr) << std::endl;
+
+            dwarf_dealloc(dbg, var_name, DW_DLA_STRING);
+          }
+        }
+      }
+
+      // Move to the next sibling
+      Dwarf_Die next_die = nullptr;
+      int rc = dwarf_siblingof_c(child_die, &next_die, &err);
+
+      dwarf_dealloc(dbg, child_die, DW_DLA_DIE);
+      child_die = next_die;
+
+      if (rc != DW_DLV_OK)
+        break;
+    }
+
+    dwarf_dealloc(dbg, cu_die, DW_DLA_DIE);
+  }
+}