1 files changed, 97 insertions, 0 deletions
diff --git a/js/public/JitCodeAPI.h b/js/public/JitCodeAPI.h
new file mode 100644
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+++ b/js/public/JitCodeAPI.h
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* SpiderMonkey API for obtaining JitCode information. */
+
+#ifndef js_JitCodeAPI_h
+#define js_JitCodeAPI_h
+
+#include "js/AllocPolicy.h"
+#include "js/ColumnNumber.h"  // JS::LimitedColumnNumberOneOrigin
+#include "js/Initialization.h"
+#include "js/Printf.h"
+#include "js/Vector.h"
+
+namespace JS {
+
+enum class JitTier { Baseline, IC, Ion, Other };
+
+class JitOpcodeDictionary {
+  typedef js::Vector<UniqueChars, 0, js::SystemAllocPolicy> StringVector;
+
+ public:
+  JitOpcodeDictionary();
+
+  StringVector& GetBaselineDictionary() { return baselineDictionary; }
+  StringVector& GetIonDictionary() { return ionDictionary; }
+  StringVector& GetInlineCacheDictionary() { return icDictionary; }
+
+ private:
+  StringVector baselineDictionary;
+  StringVector icDictionary;
+  StringVector ionDictionary;
+};
+
+struct JitCodeSourceInfo {
+  UniqueChars filename;
+  uint32_t offset = 0;
+
+  // Line number (1-origin).
+  uint32_t lineno = 0;
+  // Column number in UTF-16 code units.
+  JS::LimitedColumnNumberOneOrigin colno;
+};
+
+struct JitCodeIRInfo {
+  uint32_t offset = 0;
+  uint32_t opcode = 0;
+  UniqueChars str;
+};
+
+typedef js::Vector<JitCodeSourceInfo, 0, js::SystemAllocPolicy>
+    SourceInfoVector;
+typedef js::Vector<JitCodeIRInfo, 0, js::SystemAllocPolicy> IRInfoVector;
+
+struct JitCodeRecord {
+  UniqueChars functionName;
+  uint64_t code_addr = 0;
+  uint32_t instructionSize = 0;
+  JitTier tier = JitTier::Other;
+
+  SourceInfoVector sourceInfo;
+  IRInfoVector irInfo;
+};
+
+class JitCodeIterator {
+  void getDataForIndex(size_t iteratorIndex);
+
+ public:
+  JitCodeIterator();
+  ~JitCodeIterator();
+
+  void operator++(int) {
+    iteratorIndex++;
+    getDataForIndex(iteratorIndex);
+  }
+
+  explicit operator bool() const { return data != nullptr; }
+
+  SourceInfoVector& sourceData() { return data->sourceInfo; }
+
+  IRInfoVector& irData() { return data->irInfo; }
+
+  const char* functionName() const { return data->functionName.get(); }
+  uint64_t code_addr() const { return data->code_addr; }
+  uint32_t instructionSize() { return data->instructionSize; }
+  JitTier jit_tier() const { return data->tier; }
+
+ private:
+  JitCodeRecord* data = nullptr;
+  size_t iteratorIndex = 0;
+};
+
+}  // namespace JS
+
+#endif /* js_JitCodeAPI_h */