Code cleanup for DwarfCUToModule::NullWarningReporter changes.

Updated code to use Google's modern C++ style.

* Use std::unique_ptr to allocate DwarfCUToModule::WarningReporter.
* Fixed reference alignment in NullWarningReporter.

Change-Id: I230dac445a07b4023a64284b907010f31eadcdf4
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/5265662
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ivan Penkov <ivanpe@chromium.org>

src/common/dwarf_cu_to_module.h

@@ -254,61 +254,61 @@ class DwarfCUToModule: public RootDIEHandler {
     void UncoveredHeading();
   };
 
-  class NullWarningReporter: public WarningReporter {
+  class NullWarningReporter : public WarningReporter {
    public:
-    NullWarningReporter(const string &filename, uint64_t cu_offset):
-        WarningReporter(filename, cu_offset) { }
+    NullWarningReporter(const string& filename, uint64_t cu_offset)
+        : WarningReporter(filename, cu_offset) {}
 
     // Set the name of the compilation unit we're processing to NAME.
-    void SetCUName(const string &name) { }
+    void SetCUName(const string& name) {}
 
     // Accessor and setter for uncovered_warnings_enabled_.
     // UncoveredFunction and UncoveredLine only report a problem if that is
     // true. By default, these warnings are disabled, because those
     // conditions occur occasionally in healthy code.
-    void set_uncovered_warnings_enabled(bool value) { }
+    void set_uncovered_warnings_enabled(bool value) {}
 
     // A DW_AT_specification in the DIE at OFFSET refers to a DIE we
     // haven't processed yet, or that wasn't marked as a declaration,
     // at TARGET.
-    void UnknownSpecification(uint64_t offset, uint64_t target) { }
+    void UnknownSpecification(uint64_t offset, uint64_t target) {}
 
     // A DW_AT_abstract_origin in the DIE at OFFSET refers to a DIE we
     // haven't processed yet, or that wasn't marked as inline, at TARGET.
-    void UnknownAbstractOrigin(uint64_t offset, uint64_t target) { }
+    void UnknownAbstractOrigin(uint64_t offset, uint64_t target) {}
 
     // We were unable to find the DWARF section named SECTION_NAME.
-    void MissingSection(const string &section_name) { }
+    void MissingSection(const string& section_name) {}
 
     // The CU's DW_AT_stmt_list offset OFFSET is bogus.
-    void BadLineInfoOffset(uint64_t offset) { }
+    void BadLineInfoOffset(uint64_t offset) {}
 
     // FUNCTION includes code covered by no line number data.
-    void UncoveredFunction(const Module::Function &function) { }
+    void UncoveredFunction(const Module::Function& function) {}
 
     // Line number NUMBER in LINE_FILE, of length LENGTH, includes code
     // covered by no function.
-    void UncoveredLine(const Module::Line &line) { }
+    void UncoveredLine(const Module::Line& line) {}
 
     // The DW_TAG_subprogram DIE at OFFSET has no name specified directly
     // in the DIE, nor via a DW_AT_specification or DW_AT_abstract_origin
     // link.
-    void UnnamedFunction(uint64_t offset) { }
+    void UnnamedFunction(uint64_t offset) {}
 
     // __cxa_demangle() failed to demangle INPUT.
-    void DemangleError(const string &input) { }
+    void DemangleError(const string& input) {}
 
     // The DW_FORM_ref_addr at OFFSET to TARGET was not handled because
     // FilePrivate did not retain the inter-CU specification data.
-    void UnhandledInterCUReference(uint64_t offset, uint64_t target) { }
+    void UnhandledInterCUReference(uint64_t offset, uint64_t target) {}
 
     // The DW_AT_ranges at offset is malformed (truncated or outside of the
     // .debug_ranges section's bound).
-    void MalformedRangeList(uint64_t offset) { }
+    void MalformedRangeList(uint64_t offset) {}
 
     // A DW_AT_ranges attribute was encountered but the no .debug_ranges
     // section was found.
-    void MissingRanges() { }
+    void MissingRanges() {}
   };
 
   // Create a DWARF debugging info handler for a compilation unit

src/common/mac/dump_syms.cc

@@ -528,12 +528,12 @@ void DumpSymbols::ReadDwarf(google_breakpad::Module* module,
   for (uint64_t offset = 0; offset < debug_info_length;) {
     // Make a handler for the root DIE that populates MODULE with the
     // debug info.
-    DwarfCUToModule::WarningReporter *reporter = nullptr;
+    std::unique_ptr<DwarfCUToModule::WarningReporter> reporter;
     if (report_warnings_) {
-        reporter = new DwarfCUToModule::WarningReporter(
+      reporter = std::make_unique<DwarfCUToModule::WarningReporter>(
         selected_object_name_, offset);
     } else {
-        reporter = new DwarfCUToModule::NullWarningReporter(
+      reporter = std::make_unique<DwarfCUToModule::NullWarningReporter>(
         selected_object_name_, offset);
     }
     DwarfCUToModule root_handler(&file_context, &line_to_module,
@@ -554,7 +554,6 @@ void DumpSymbols::ReadDwarf(google_breakpad::Module* module,
       StartProcessSplitDwarf(&dwarf_reader, module, endianness,
                              handle_inter_cu_refs, handle_inline);
     }
-    delete reporter;
   }
 }