[api] Add Isolate::GetEmbeddedCodeRange

... to expose the memory region containing embedded builtins. Similar
to `GetCodeRange`, which does the same for on-heap V8 Code objects.

Bug: v8:11001
Change-Id: I1aa3ae650f161cabb410c61dbb6d364908370f8f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2465461
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70470}

include/v8.h

@@ -9367,6 +9367,12 @@ class V8_EXPORT Isolate {
    */
   void GetCodeRange(void** start, size_t* length_in_bytes);
 
+  /**
+   * As GetCodeRange, but for embedded builtins (these live in a distinct
+   * memory region from other V8 Code objects).
+   */
+  void GetEmbeddedCodeRange(const void** start, size_t* length_in_bytes);
+
   /**
    * Returns the JSEntryStubs necessary for use with the Unwinder API.
    */

src/api/api.cc

@@ -100,6 +100,7 @@
 #include "src/regexp/regexp-utils.h"
 #include "src/runtime/runtime.h"
 #include "src/snapshot/code-serializer.h"
+#include "src/snapshot/embedded/embedded-data.h"
 #include "src/snapshot/snapshot.h"
 #include "src/snapshot/startup-serializer.h"  // For SerializedHandleChecker.
 #include "src/strings/char-predicates-inl.h"
@@ -9009,6 +9010,14 @@ void Isolate::GetCodeRange(void** start, size_t* length_in_bytes) {
   *length_in_bytes = code_range.size();
 }
 
+void Isolate::GetEmbeddedCodeRange(const void** start,
+                                   size_t* length_in_bytes) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  i::EmbeddedData d = i::EmbeddedData::FromBlob(isolate);
+  *start = reinterpret_cast<const void*>(d.code());
+  *length_in_bytes = d.code_size();
+}
+
 JSEntryStubs Isolate::GetJSEntryStubs() {
   JSEntryStubs entry_stubs;