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src: generate snapshot with --predictable #48749

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Oct 9, 2023
Merged

src: generate snapshot with --predictable #48749

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6 changes: 6 additions & 0 deletions src/node.cc
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Expand Up @@ -838,6 +838,12 @@ static ExitCode InitializeNodeWithArgsInternal(
V8::SetFlagsFromString(NODE_V8_OPTIONS, sizeof(NODE_V8_OPTIONS) - 1);
#endif

if (!!(flags & ProcessInitializationFlags::kGeneratePredictableSnapshot) ||
per_process::cli_options->per_isolate->build_snapshot) {
v8::V8::SetFlagsFromString("--predictable");
v8::V8::SetFlagsFromString("--random_seed=42");
}

// Specify this explicitly to avoid being affected by V8 changes to the
// default value.
V8::SetFlagsFromString("--rehash-snapshot");
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2 changes: 2 additions & 0 deletions src/node.h
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Expand Up @@ -265,6 +265,8 @@ enum Flags : uint32_t {
// cppgc::InitializeProcess() before creating a Node.js environment
// and call cppgc::ShutdownProcess() before process shutdown.
kNoInitializeCppgc = 1 << 13,
// Initialize the process for predictable snapshot generation.
kGeneratePredictableSnapshot = 1 << 14,

// Emulate the behavior of InitializeNodeWithArgs() when passing
// a flags argument to the InitializeOncePerProcess() replacement
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5 changes: 2 additions & 3 deletions tools/snapshot/node_mksnapshot.cc
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Expand Up @@ -50,8 +50,6 @@ int main(int argc, char* argv[]) {
setvbuf(stderr, nullptr, _IONBF, 0);
#endif // _WIN32

v8::V8::SetFlagsFromString("--random_seed=42");
v8::V8::SetFlagsFromString("--harmony-import-assertions");
return BuildSnapshot(argc, argv);
}

Expand All @@ -65,7 +63,8 @@ int BuildSnapshot(int argc, char* argv[]) {

std::unique_ptr<node::InitializationResult> result =
node::InitializeOncePerProcess(
std::vector<std::string>(argv, argv + argc));
std::vector<std::string>(argv, argv + argc),
node::ProcessInitializationFlags::kGeneratePredictableSnapshot);

CHECK(!result->early_return());
CHECK_EQ(result->exit_code(), 0);
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