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[Target] Generalize language-specific behavior in ThreadPlanStepThrough 

Summary:
When creating a ThreadPlan to step through a trampoline, we ask the
ObjC language runtime and the CPP language runtime to come up with such a thread
plan if the dynamic loader fails to give us one. I don't see why this behavior
can't be language agnostic.

Differential Revision: https://reviews.llvm.org/D61921

llvm-svn: 362164
This commit is contained in:
Alex Langford 2019-05-30 22:00:18 +00:00
parent 365e592480
commit e5a7a858f5
4 changed files with 14 additions and 20 deletions
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2
lldb/include/lldb/Target/CPPLanguageRuntime.h
View File

@ -61,7 +61,7 @@ public:
/// \return
/// A ThreadPlan Shared pointer
lldb::ThreadPlanSP GetStepThroughTrampolinePlan(Thread &thread,
bool stop_others);
bool stop_others) override;
bool IsRuntimeSupportValue(ValueObject &valobj) override;
protected:

3
lldb/include/lldb/Target/LanguageRuntime.h
View File

@ -143,6 +143,9 @@ public:
return false;
}
virtual lldb::ThreadPlanSP GetStepThroughTrampolinePlan(Thread &thread,
bool stop_others) = 0;
/// Identify whether a value is a language implementation detaul
/// that should be hidden from the user interface by default.
virtual bool IsRuntimeSupportValue(ValueObject &valobj) { return false; }

3
lldb/include/lldb/Target/ObjCLanguageRuntime.h
View File

@ -216,9 +216,6 @@ public:
virtual bool HasReadObjCLibrary() = 0;
virtual lldb::ThreadPlanSP GetStepThroughTrampolinePlan(Thread &thread,
bool stop_others) = 0;
lldb::addr_t LookupInMethodCache(lldb::addr_t class_addr, lldb::addr_t sel);
void AddToMethodCache(lldb::addr_t class_addr, lldb::addr_t sel,

26
lldb/source/Target/ThreadPlanStepThrough.cpp
View File

@ -8,9 +8,8 @@
#include "lldb/Target/ThreadPlanStepThrough.h"
#include "lldb/Breakpoint/Breakpoint.h"
#include "lldb/Target/CPPLanguageRuntime.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/ObjCLanguageRuntime.h"
#include "lldb/Target/LanguageRuntime.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
@ -85,22 +84,17 @@ void ThreadPlanStepThrough::LookForPlanToStepThroughFromCurrentPC() {
m_sub_plan_sp =
loader->GetStepThroughTrampolinePlan(m_thread, m_stop_others);
// If that didn't come up with anything, try the ObjC runtime plugin:
if (!m_sub_plan_sp.get()) {
ObjCLanguageRuntime *objc_runtime =
m_thread.GetProcess()->GetObjCLanguageRuntime();
if (objc_runtime)
// If the DynamicLoader was unable to provide us with a ThreadPlan, then we
// try the LanguageRuntimes.
if (!m_sub_plan_sp) {
for (LanguageRuntime *runtime :
m_thread.GetProcess()->GetLanguageRuntimes()) {
m_sub_plan_sp =
objc_runtime->GetStepThroughTrampolinePlan(m_thread, m_stop_others);
runtime->GetStepThroughTrampolinePlan(m_thread, m_stop_others);
CPPLanguageRuntime *cpp_runtime =
m_thread.GetProcess()->GetCPPLanguageRuntime();
// If the ObjC runtime did not provide us with a step though plan then if we
// have it check the C++ runtime for a step though plan.
if (!m_sub_plan_sp.get() && cpp_runtime)
m_sub_plan_sp =
cpp_runtime->GetStepThroughTrampolinePlan(m_thread, m_stop_others);
if (m_sub_plan_sp)
break;
}
}
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));