Add SourceReport, a class for generating Dart source-level reports.

runtime/vm/source_report.h

Index: runtime/vm/source_report.h
diff --git a/runtime/vm/source_report.h b/runtime/vm/source_report.h
new file mode 100644
index 0000000000000000000000000000000000000000..69529d3934aea122f25358b35d0c474220d0e7e6
--- /dev/null
+++ b/runtime/vm/source_report.h
@@ -0,0 +1,106 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef VM_SOURCE_REPORT_H_
+#define VM_SOURCE_REPORT_H_
+
+#include "vm/allocation.h"
+#include "vm/flags.h"
+#include "vm/hash_map.h"
+#include "vm/object.h"
+
+namespace dart {
+
+// A SourceReport object is used to generate reports about the program
+// source code, with information associated with source token
+// positions.  There are multiple possible kinds of reports.
+class SourceReport {
+ public:
+  enum ReportKind {
+    kCallSites,
+    kCoverage,
+  };
+
+  enum CompileMode {
+    kNoCompile,
+    kForceCompile
+  };
+
+  explicit SourceReport(ReportKind report_kind,
+                        CompileMode compile = kNoCompile);
+
+  // Generate a source report for (some subrange of) a script.
+  //
+  // If script is null, then the report is generated for all scripts
+  // in the isolate.
+  void PrintJSON(JSONStream* js, const Script& script,
+                 intptr_t start_pos = -1, intptr_t end_pos = -1);
+
+ private:
+  void Init(Thread* thread, const Script* script,
+            intptr_t start_pos, intptr_t end_pos);
+
+  Thread* thread() const { return thread_; }
+  Zone* zone() const { return thread_->zone(); }
+
+  bool ShouldSkipFunction(const Function& func);
+  intptr_t GetScriptIndex(const Script& script);
+  bool ScriptIsLoadedByLibrary(const Script& script, const Library& lib);
+
+  void PrintCallSitesData(JSONObject* jsobj,
+                          const Function& func, const Code& code);
+  void PrintCoverageData(JSONObject* jsobj,
+                         const Function& func, const Code& code);
+  void PrintScriptTable(JSONArray* jsarr);
+
+  void VisitFunction(JSONArray* jsarr, const Function& func);
+  void VisitLibrary(JSONArray* jsarr, const Library& lib);
+  void VisitClosures(JSONArray* jsarr);
+
+  // An entry in the script table.
+  struct ScriptTableEntry {
+    ScriptTableEntry() : key(NULL), index(-1), script(NULL) {}
+
+    const String* key;
+    intptr_t index;
+    const Script* script;
+  };
+
+  // Needed for DirectChainedHashMap.
+  struct ScriptTableTrait {
+    typedef ScriptTableEntry* Value;
+    typedef const String* Key;
+    typedef ScriptTableEntry* Pair;
+
+    static Key KeyOf(Pair kv) {
+      return kv->key;
+    }
+
+    static Value ValueOf(Pair kv) {
+      return kv;
+    }
+
+    static inline intptr_t Hashcode(Key key) {
+      return key->Hash();
+    }
+
+    static inline bool IsKeyEqual(Pair kv, Key key) {
+      return kv->key->Equals(*key);
+    }
+  };
+
+  ReportKind report_kind_;
+  CompileMode compile_mode_;
+  Thread* thread_;
+  const Script* script_;
+  intptr_t start_pos_;
+  intptr_t end_pos_;
+  GrowableArray<ScriptTableEntry> script_table_entries_;
+  DirectChainedHashMap<ScriptTableTrait> script_table_;
+  intptr_t next_script_index_;
+};
+
+}  // namespace dart
+
+#endif  // VM_SOURCE_REPORT_H_