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//===-- sanitizer_unwind_win.cc -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// Sanitizer unwind Windows specific functions.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_WINDOWS
#define WIN32_LEAN_AND_MEAN
#define NOGDI
#include <windows.h>
#include "sanitizer_dbghelp.h" // for StackWalk64
#include "sanitizer_stacktrace.h"
#include "sanitizer_symbolizer.h" // for InitializeDbgHelpIfNeeded
using namespace __sanitizer;
#if !SANITIZER_GO
void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
CHECK_GE(max_depth, 2);
// FIXME: CaptureStackBackTrace might be too slow for us.
// FIXME: Compare with StackWalk64.
// FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
size = CaptureStackBackTrace(1, Min(max_depth, kStackTraceMax),
(void **)&trace_buffer[0], 0);
if (size == 0)
return;
// Skip the RTL frames by searching for the PC in the stacktrace.
uptr pc_location = LocatePcInTrace(pc);
PopStackFrames(pc_location);
}
void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
u32 max_depth) {
CONTEXT ctx = *(CONTEXT *)context;
STACKFRAME64 stack_frame;
memset(&stack_frame, 0, sizeof(stack_frame));
InitializeDbgHelpIfNeeded();
size = 0;
#if defined(_WIN64)
int machine_type = IMAGE_FILE_MACHINE_AMD64;
stack_frame.AddrPC.Offset = ctx.Rip;
stack_frame.AddrFrame.Offset = ctx.Rbp;
stack_frame.AddrStack.Offset = ctx.Rsp;
#else
int machine_type = IMAGE_FILE_MACHINE_I386;
stack_frame.AddrPC.Offset = ctx.Eip;
stack_frame.AddrFrame.Offset = ctx.Ebp;
stack_frame.AddrStack.Offset = ctx.Esp;
#endif
stack_frame.AddrPC.Mode = AddrModeFlat;
stack_frame.AddrFrame.Mode = AddrModeFlat;
stack_frame.AddrStack.Mode = AddrModeFlat;
while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
&stack_frame, &ctx, NULL, SymFunctionTableAccess64,
SymGetModuleBase64, NULL) &&
size < Min(max_depth, kStackTraceMax)) {
trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
}
}
#endif // #if !SANITIZER_GO
#endif // SANITIZER_WINDOWS
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