[LLDB][SBSaveCoreOptions] Add new API to expose the expected core size in bytes (#138169)

My current internal work requires some sensitivity to IO usage. I had a
work around to calculate the expected size of a Minidump, but I've added
this PR so an automated system could look at the expected size of an
LLDB generated Minidump and then choose if it has the space or wants to
generate it.

There are some prerequisites to calculating the correct size, so I have
the API take a reference for an SBError, I originally tried to return an
SBError and instead take a uint64_t reference, but this made the API
very difficult to use in python.

Added a test case as well.

1 files changed, 14 insertions, 0 deletions

diff --git a/lldb/source/API/SBSaveCoreOptions.cpp b/lldb/source/API/SBSaveCoreOptions.cpp
index 35b9da5..e101f6a 100644
--- a/lldb/source/API/SBSaveCoreOptions.cpp
+++ b/lldb/source/API/SBSaveCoreOptions.cpp
@@ -114,6 +114,20 @@ void SBSaveCoreOptions::Clear() {
   m_opaque_up->Clear();
 }
 
+uint64_t SBSaveCoreOptions::GetCurrentSizeInBytes(SBError &error) {
+  LLDB_INSTRUMENT_VA(this, error);
+  llvm::Expected<uint64_t> expected_bytes =
+      m_opaque_up->GetCurrentSizeInBytes();
+  if (!expected_bytes) {
+    error =
+        SBError(lldb_private::Status::FromError(expected_bytes.takeError()));
+    return 0;
+  }
+  // Clear the error, so if the clearer uses it we set it to success.
+  error.Clear();
+  return *expected_bytes;
+}
+
 lldb_private::SaveCoreOptions &SBSaveCoreOptions::ref() const {
   return *m_opaque_up.get();
 }