deps: cherry-pick 073073b from upstream V8

Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: https://github.com/v8/v8/commit/073073b4f12b683fc0406cd15b3cb284633fe18e

PR-URL: https://github.com/nodejs/node/pull/24515
Refs: https://github.com/nodejs/node/pull/24274
Refs: https://github.com/nodejs/node/pull/24394
Refs: https://github.com/nodejs/node/issues/24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/deps/v8/test/cctest/test-cpu-profiler.cc b/deps/v8/test/cctest/test-cpu-profiler.cc
index 75af3f6d98..e08bec375e 100644
--- a/deps/v8/test/cctest/test-cpu-profiler.cc
+++ b/deps/v8/test/cctest/test-cpu-profiler.cc
@@ -40,6 +40,7 @@
 #include "src/objects-inl.h"
 #include "src/profiler/cpu-profiler-inl.h"
 #include "src/profiler/profiler-listener.h"
+#include "src/source-position-table.h"
 #include "src/utils.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/profiler-extension.h"
@@ -2544,6 +2545,61 @@ TEST(MultipleProfilers) {
   profiler2->StopProfiling("2");
 }
 
+int GetSourcePositionEntryCount(i::Isolate* isolate, const char* source) {
+  i::Handle<i::JSFunction> function = i::Handle<i::JSFunction>::cast(
+      v8::Utils::OpenHandle(*CompileRun(source)));
+  if (function->IsInterpreted()) return -1;
+  i::Handle<i::Code> code(function->code(), isolate);
+  i::SourcePositionTableIterator iterator(
+      ByteArray::cast(code->source_position_table()));
+  int count = 0;
+  while (!iterator.done()) {
+    count++;
+    iterator.Advance();
+  }
+  return count;
+}
+
+UNINITIALIZED_TEST(DetailedSourcePositionAPI) {
+  i::FLAG_detailed_line_info = false;
+  i::FLAG_allow_natives_syntax = true;
+  v8::Isolate::CreateParams create_params;
+  create_params.array_buffer_allocator = CcTest::array_buffer_allocator();
+  v8::Isolate* isolate = v8::Isolate::New(create_params);
+
+  const char* source =
+      "function fib(i) {"
+      "  if (i <= 1) return 1; "
+      "  return fib(i - 1) +"
+      "         fib(i - 2);"
+      "}"
+      "fib(5);"
+      "%OptimizeFunctionOnNextCall(fib);"
+      "fib(5);"
+      "fib";
+  {
+    v8::Isolate::Scope isolate_scope(isolate);
+    v8::HandleScope handle_scope(isolate);
+    v8::Local<v8::Context> context = v8::Context::New(isolate);
+    v8::Context::Scope context_scope(context);
+    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+
+    CHECK(!i_isolate->NeedsDetailedOptimizedCodeLineInfo());
+
+    int non_detailed_positions = GetSourcePositionEntryCount(i_isolate, source);
+
+    v8::CpuProfiler::UseDetailedSourcePositionsForProfiling(isolate);
+    CHECK(i_isolate->NeedsDetailedOptimizedCodeLineInfo());
+
+    int detailed_positions = GetSourcePositionEntryCount(i_isolate, source);
+
+    CHECK((non_detailed_positions == -1 && detailed_positions == -1) ||
+          non_detailed_positions < detailed_positions);
+  }
+
+  isolate->Dispose();
+}
+
 }  // namespace test_cpu_profiler
 }  // namespace internal
 }  // namespace v8