Store map name in map class

src/codegen_llvm.cpp

@@ -28,7 +28,7 @@ void CodegenLLVM::visit(Map &map)
 {
   int mapfd;
   if (bpftrace_.maps_.find(map.ident) == bpftrace_.maps_.end()) {
-    bpftrace_.maps_[map.ident] = std::make_unique<ebpf::bpftrace::Map>();
+    bpftrace_.maps_[map.ident] = std::make_unique<ebpf::bpftrace::Map>(map.ident);
   }
   mapfd = bpftrace_.maps_[map.ident]->mapfd_;
 
@@ -104,7 +104,7 @@ void CodegenLLVM::visit(AssignMapStatement &assignment)
   Map &map = *assignment.map;
   int mapfd;
   if (bpftrace_.maps_.find(map.ident) == bpftrace_.maps_.end()) {
-    bpftrace_.maps_[map.ident] = std::make_unique<ebpf::bpftrace::Map>();
+    bpftrace_.maps_[map.ident] = std::make_unique<ebpf::bpftrace::Map>(map.ident);
   }
   mapfd = bpftrace_.maps_[map.ident]->mapfd_;
 

src/map.cpp

@@ -7,11 +7,11 @@
 namespace ebpf {
 namespace bpftrace {
 
-Map::Map() {
+Map::Map(std::string &name) : name_(name) {
   mapfd_ = bpf_create_map(BPF_MAP_TYPE_HASH, 8, 8, 128, 0);
   if (mapfd_ < 0)
   {
-    std::cerr << "Error creating map" << std::endl;;
+    std::cerr << "Error creating map: '" << name_ << "'" << std::endl;
   }
 }
 

src/map.h

@@ -8,10 +8,11 @@ namespace bpftrace {
 
 class Map {
 public:
-  Map();
+  explicit Map(std::string &);
   ~Map();
 
   int mapfd_;
+  std::string name_;
 };
 
 } // namespace bpftrace