leonid.mashinskiy created this revision.
leonid.mashinskiy added reviewers: asmith, stella.stamenova.
leonid.mashinskiy added a project: LLDB.
Herald added subscribers: lldb-commits, abidh.
Dump more information about "access violation" and "in page error" exceptions
to description.
Description now contains data about read/write violation type and actual
address as described at
https://docs.microsoft.com/en-us/windows/desktop/api/winnt/ns-winnt-_exception_record
Repository:
rLLDB LLDB
https://reviews.llvm.org/D60519
Files:
source/Plugins/Process/Windows/Common/ExceptionRecord.h
source/Plugins/Process/Windows/Common/ProcessWindows.cpp
Index: source/Plugins/Process/Windows/Common/ProcessWindows.cpp
===================================================================
--- source/Plugins/Process/Windows/Common/ProcessWindows.cpp
+++ source/Plugins/Process/Windows/Common/ProcessWindows.cpp
@@ -476,6 +476,74 @@
RefreshStateAfterStop();
}
+static void
+DumpAdditionalExceptionInformation(llvm::raw_ostream &stream,
+ const ExceptionRecordSP &exception) {
+ // Decode additional exception information for specific exception types based
+ // on
+ // https://docs.microsoft.com/en-us/windows/desktop/api/winnt/ns-winnt-_exception_record
+
+ const int addr_min_width = 2 + 8; // "0x" + 4 address bytes
+
+ const std::vector<ULONG_PTR> &args = exception->GetExceptionArguments();
+ switch (exception->GetExceptionCode()) {
+ case EXCEPTION_ACCESS_VIOLATION: {
+ if (args.size() < 2)
+ break;
+
+ stream << ": ";
+ const int access_violation_code = args[0];
+ const lldb::addr_t access_violation_address = args[1];
+ switch (access_violation_code) {
+ case 0:
+ stream << "Access violation reading";
+ break;
+ case 1:
+ stream << "Access violation writing";
+ break;
+ case 8:
+ stream << "User-mode data execution prevention (DEP) violation at";
+ break;
+ default:
+ stream << "Unknown access violation (code " << access_violation_code
+ << ") at";
+ break;
+ }
+ stream << " location "
+ << llvm::format_hex(access_violation_address, addr_min_width);
+ break;
+ }
+ case EXCEPTION_IN_PAGE_ERROR: {
+ if (args.size() < 3)
+ break;
+
+ stream << ": ";
+ const int page_load_error_code = args[0];
+ const lldb::addr_t page_load_error_address = args[1];
+ const DWORD underlying_code = args[2];
+ switch (page_load_error_code) {
+ case 0:
+ stream << "In page error reading";
+ break;
+ case 1:
+ stream << "In page error writing";
+ break;
+ case 8:
+ stream << "User-mode data execution prevention (DEP) violation at";
+ break;
+ default:
+ stream << "Unknown page loading error (code " << page_load_error_code
+ << ") at";
+ break;
+ }
+ stream << " location "
+ << llvm::format_hex(page_load_error_address, addr_min_width)
+ << " (status code " << llvm::format_hex(underlying_code, 8) << ")";
+ break;
+ }
+ }
+}
+
void ProcessWindows::RefreshStateAfterStop() {
Log *log = ProcessWindowsLog::GetLogIfAny(WINDOWS_LOG_EXCEPTION);
llvm::sys::ScopedLock lock(m_mutex);
@@ -575,6 +643,8 @@
<< llvm::format_hex(active_exception->GetExceptionCode(), 8)
<< " encountered at address "
<< llvm::format_hex(active_exception->GetExceptionAddress(), 8);
+ DumpAdditionalExceptionInformation(desc_stream, active_exception);
+
stop_info = StopInfo::CreateStopReasonWithException(
*stop_thread, desc_stream.str().c_str());
stop_thread->SetStopInfo(stop_info);
Index: source/Plugins/Process/Windows/Common/ExceptionRecord.h
===================================================================
--- source/Plugins/Process/Windows/Common/ExceptionRecord.h
+++ source/Plugins/Process/Windows/Common/ExceptionRecord.h
@@ -66,6 +66,8 @@
lldb::tid_t GetThreadID() const { return m_thread_id; }
+ const std::vector<ULONG_PTR>& GetExceptionArguments() const { return m_arguments; }
+
private:
DWORD m_code;
bool m_continuable;
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