Swift: add trace logging of all trap emission

misc/codegen/templates/cpp_classes_h.mustache

@@ -5,6 +5,8 @@
 #include <iostream>
 #include <optional>
 #include <vector>
+#include <binlog/binlog.hpp>
+#include <binlog/adapt_stdoptional.hpp>
 
 #include "{{trap_library}}/TrapLabel.h"
 #include "{{trap_library}}/TrapTagTraits.h"
@@ -80,3 +82,9 @@ struct detail::ToTrapClassFunctor<{{name}}Tag> {
 };
 {{/classes}}
 }
+
+{{#classes}}
+{{#final}}
+BINLOG_ADAPT_STRUCT(codeql::{{name}}, id{{> cpp_list_fields}});
+{{/final}}
+{{/classes}}

misc/codegen/templates/cpp_list_fields.mustache

@@ -0,0 +1 @@
+{{#bases}}{{#ref}}{{> cpp_list_fields}}{{/ref}}{{/bases}}{{#fields}}, {{field_name}}{{/fields}}

misc/codegen/templates/trap_traps_h.mustache

@@ -4,6 +4,7 @@
 
 #include <iostream>
 #include <string>
+#include <binlog/binlog.hpp>
 
 #include "{{trap_library_dir}}/TrapLabel.h"
 #include "{{trap_library_dir}}/TrapTagTraits.h"
@@ -43,3 +44,7 @@ struct ToBindingTrapFunctor<{{type}}> {
 {{/id}}
 {{/traps}}
 }
+
+{{#traps}}
+BINLOG_ADAPT_STRUCT(codeql::{{name}}Trap{{#fields}}, {{field_name}}{{/fields}});
+{{/traps}}

swift/extractor/infra/file/TargetFile.h

@@ -36,6 +36,8 @@ class TargetFile {
     return *this;
   }
 
+  const std::filesystem::path& target() const { return targetPath; }
+
  private:
   TargetFile(const std::filesystem::path& target,
              const std::filesystem::path& targetDir,

swift/extractor/trap/BUILD.bazel

@@ -49,5 +49,6 @@ swift_cc_library(
     visibility = ["//visibility:public"],
     deps = [
         "//swift/extractor/infra/file",
+        "//swift/extractor/infra/log",
     ],
 )

swift/extractor/trap/TrapDomain.h

@@ -5,18 +5,21 @@
 
 #include "swift/extractor/trap/TrapLabel.h"
 #include "swift/extractor/infra/file/TargetFile.h"
+#include "swift/extractor/infra/log/SwiftLogging.h"
 
 namespace codeql {
 
 // Abstracts a given trap output file, with its own universe of trap labels
 class TrapDomain {
   TargetFile out;
+  Logger logger{out.target().filename()};
 
  public:
   explicit TrapDomain(TargetFile&& out) : out{std::move(out)} {}
 
   template <typename Entry>
   void emit(const Entry& e) {
+    LOG_TRACE("{}", e);
     out << e << '\n';
   }
 
@@ -48,6 +51,7 @@ class TrapDomain {
                                                  Args&&... args) {
     auto ret = allocateLabel<Tag>();
     assignKey(ret, std::forward<Args>(args)...);
+    LOG_TRACE("^^^ .implementation {}", implementationId);
     out << " .implementation " << trapQuoted(implementationId) << '\n';
     return ret;
   }
@@ -62,6 +66,7 @@ class TrapDomain {
 
   template <typename Tag>
   void assignStar(TrapLabel<Tag> label) {
+    LOG_TRACE("{}=*", label);
     out << label << "=*";
   }
 
@@ -69,6 +74,7 @@ class TrapDomain {
   void assignKey(TrapLabel<Tag> label, const std::string& key) {
     // prefix the key with the id to guarantee the same key is not used wrongly with different tags
     auto prefixed = std::string(Tag::prefix) + '_' + key;
+    LOG_TRACE("{}=@{}", label, prefixed);
     out << label << "=@" << trapQuoted(prefixed);
   }
 

swift/extractor/trap/TrapLabel.h

@@ -5,6 +5,9 @@
 #include <iostream>
 #include <string>
 #include <vector>
+#include <binlog/binlog.hpp>
+#include <cmath>
+#include <charconv>
 
 namespace codeql {
 
@@ -18,6 +21,7 @@ class UntypedTrapLabel {
   friend class std::hash<UntypedTrapLabel>;
   template <typename Tag>
   friend class TrapLabel;
+  BINLOG_ADAPT_STRUCT_FRIEND;
 
   static constexpr uint64_t undefined = 0xffffffffffffffff;
 
@@ -38,7 +42,21 @@ class UntypedTrapLabel {
     return out;
   }
 
+  std::string str() const {
+    std::string ret(strSize(), '\0');
+    ret[0] = '#';
+    std::to_chars(ret.data() + 1, ret.data() + ret.size(), id_, 16);
+    return ret;
+  }
+
   friend bool operator==(UntypedTrapLabel lhs, UntypedTrapLabel rhs) { return lhs.id_ == rhs.id_; }
+
+ private:
+  size_t strSize() const {
+    if (id_ == undefined) return 17;  // #ffffffffffffffff
+    if (id_ == 0) return 2;           // #0
+    return /* # */ 1 + /* hex digits */ static_cast<size_t>(ceil(log2(id_ + 1) / 4));
+  }
 };
 
 template <typename TagParam>
@@ -100,3 +118,33 @@ struct hash<codeql::UntypedTrapLabel> {
   }
 };
 }  // namespace std
+
+namespace mserialize {
+// log labels using their string representation, using binlog/mserialize internal plumbing
+template <>
+struct CustomTag<codeql::UntypedTrapLabel, void> : detail::BuiltinTag<std::string> {
+  using T = codeql::UntypedTrapLabel;
+};
+
+template <typename Tag>
+struct CustomTag<codeql::TrapLabel<Tag>, void> : detail::BuiltinTag<std::string> {
+  using T = codeql::TrapLabel<Tag>;
+};
+
+template <>
+struct CustomSerializer<codeql::UntypedTrapLabel, void> {
+  template <typename OutputStream>
+  static void serialize(codeql::UntypedTrapLabel label, OutputStream& out) {
+    mserialize::serialize(label.str(), out);
+  }
+
+  static size_t serialized_size(codeql::UntypedTrapLabel label) {
+    return sizeof(std::uint32_t) + label.strSize();
+  }
+};
+
+template <typename Tag>
+struct CustomSerializer<codeql::TrapLabel<Tag>, void> : CustomSerializer<codeql::UntypedTrapLabel> {
+};
+
+}  // namespace mserialize