[lldb] [gdb-remote] Support getting siginfo via API

Add Thread::GetSiginfo() and SBThread::GetSiginfo() methods to retrieve
the siginfo value from server.

Differential Revision: https://reviews.llvm.org/D118055

1 files changed, 47 insertions, 0 deletions

diff --git a/lldb/source/API/SBThread.cpp b/lldb/source/API/SBThread.cpp
index 46a6c27..dcc2a6e 100644
--- a/lldb/source/API/SBThread.cpp
+++ b/lldb/source/API/SBThread.cpp
@@ -1317,3 +1317,50 @@ lldb_private::Thread *SBThread::operator->() {
 lldb_private::Thread *SBThread::get() {
   return m_opaque_sp->GetThreadSP().get();
 }
+
+SBValue SBThread::GetSiginfo(SBError &error) {
+  LLDB_INSTRUMENT_VA(this, error);
+
+  SBValue value;
+  SBProcess process = GetProcess();
+  if (!process.IsValid()) {
+    error.SetErrorString("no process");
+    return value;
+  }
+  SBTarget target = process.GetTarget();
+  if (!target.IsValid()) {
+    error.SetErrorString("unable to get target");
+    return value;
+  }
+  SBPlatform platform = target.GetPlatform();
+  if (!platform.IsValid()) {
+    error.SetErrorString("unable to get platform");
+    return value;
+  }
+  CompilerType type = platform.GetSP()->GetSiginfoType(
+      target.GetSP()->GetArchitecture().GetTriple());
+  if (!type.IsValid()) {
+    error.SetErrorString("no siginfo_t for the platform");
+    return value;
+  }
+  llvm::Optional<uint64_t> type_size = type.GetByteSize(nullptr);
+  assert(type_size);
+  ThreadSP thread_sp = m_opaque_sp->GetThreadSP();
+  if (!thread_sp) {
+    error.SetErrorString("unable to get thread");
+    return value;
+  }
+  llvm::Expected<std::unique_ptr<llvm::MemoryBuffer>> data =
+      thread_sp->GetSiginfo(type_size.getValue());
+  if (!data) {
+    error.SetErrorString(llvm::toString(data.takeError()).c_str());
+    return value;
+  }
+  SBData sb_data;
+  sb_data.SetData(error, data.get()->getBufferStart(),
+                  data.get()->getBufferSize(), process.GetByteOrder(), 0);
+  if (!sb_data.IsValid())
+    return value;
+
+  return target.CreateValueFromData("siginfo", sb_data, type);
+}