本文整理汇总了C++中UnwindPlan::GetRowForFunctionOffset方法的典型用法代码示例。如果您正苦于以下问题：C++ UnwindPlan::GetRowForFunctionOffset方法的具体用法？C++ UnwindPlan::GetRowForFunctionOffset怎么用？C++ UnwindPlan::GetRowForFunctionOffset使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类UnwindPlan的用法示例。
在下文中一共展示了UnwindPlan::GetRowForFunctionOffset方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: process_sp
bool UnwindAssembly_x86::AugmentUnwindPlanFromCallSite(
AddressRange &func, Thread &thread, UnwindPlan &unwind_plan) {
bool do_augment_unwindplan = true;
UnwindPlan::RowSP first_row = unwind_plan.GetRowForFunctionOffset(0);
UnwindPlan::RowSP last_row = unwind_plan.GetRowForFunctionOffset(-1);
int wordsize = 8;
ProcessSP process_sp(thread.GetProcess());
if (process_sp.get() == nullptr)
return false;
wordsize = process_sp->GetTarget().GetArchitecture().GetAddressByteSize();
RegisterNumber sp_regnum(thread, eRegisterKindGeneric,
LLDB_REGNUM_GENERIC_SP);
RegisterNumber pc_regnum(thread, eRegisterKindGeneric,
LLDB_REGNUM_GENERIC_PC);
// Does this UnwindPlan describe the prologue? I want to see that the CFA is
// set in terms of the stack pointer plus an offset, and I want to see that
// rip is retrieved at the CFA-wordsize. If there is no description of the
// prologue, don't try to augment this eh_frame unwinder code, fall back to
// assembly parsing instead.
if (first_row->GetCFAValue().GetValueType() !=
UnwindPlan::Row::FAValue::isRegisterPlusOffset ||
RegisterNumber(thread, unwind_plan.GetRegisterKind(),
first_row->GetCFAValue().GetRegisterNumber()) !=
sp_regnum ||
first_row->GetCFAValue().GetOffset() != wordsize) {
return false;
}
UnwindPlan::Row::RegisterLocation first_row_pc_loc;
if (!first_row->GetRegisterInfo(
pc_regnum.GetAsKind(unwind_plan.GetRegisterKind()),
first_row_pc_loc) ||
!first_row_pc_loc.IsAtCFAPlusOffset() ||
first_row_pc_loc.GetOffset() != -wordsize) {
return false;
}
// It looks like the prologue is described. Is the epilogue described? If it
// is, no need to do any augmentation.
if (first_row != last_row &&
first_row->GetOffset() != last_row->GetOffset()) {
// The first & last row have the same CFA register and the same CFA offset
// value and the CFA register is esp/rsp (the stack pointer).
// We're checking that both of them have an unwind rule like "CFA=esp+4" or
// CFA+rsp+8".
if (first_row->GetCFAValue().GetValueType() ==
last_row->GetCFAValue().GetValueType() &&
first_row->GetCFAValue().GetRegisterNumber() ==
last_row->GetCFAValue().GetRegisterNumber() &&
first_row->GetCFAValue().GetOffset() ==
last_row->GetCFAValue().GetOffset()) {
// Get the register locations for eip/rip from the first & last rows. Are
// they both CFA plus an offset? Is it the same offset?
UnwindPlan::Row::RegisterLocation last_row_pc_loc;
if (last_row->GetRegisterInfo(
pc_regnum.GetAsKind(unwind_plan.GetRegisterKind()),
last_row_pc_loc)) {
if (last_row_pc_loc.IsAtCFAPlusOffset() &&
first_row_pc_loc.GetOffset() == last_row_pc_loc.GetOffset()) {
// One last sanity check: Is the unwind rule for getting the caller
// pc value "deref the CFA-4" or "deref the CFA-8"?
// If so, we have an UnwindPlan that already describes the epilogue
// and we don't need to modify it at all.
if (first_row_pc_loc.GetOffset() == -wordsize) {
do_augment_unwindplan = false;
}
}
}
}
}
if (do_augment_unwindplan) {
if (!func.GetBaseAddress().IsValid() || func.GetByteSize() == 0)
return false;
if (m_assembly_inspection_engine == nullptr)
return false;
const bool prefer_file_cache = true;
std::vector<uint8_t> function_text(func.GetByteSize());
Status error;
if (process_sp->GetTarget().ReadMemory(
func.GetBaseAddress(), prefer_file_cache, function_text.data(),
func.GetByteSize(), error) == func.GetByteSize()) {
RegisterContextSP reg_ctx(thread.GetRegisterContext());
m_assembly_inspection_engine->Initialize(reg_ctx);
return m_assembly_inspection_engine->AugmentUnwindPlanFromCallSite(
function_text.data(), func.GetByteSize(), func, unwind_plan, reg_ctx);
}
}
//.........这里部分代码省略.........