[Lldb-commits] [lldb] fcdef15 - Add a new Row setting to mark all un-declared regs as Undefined
Jason Molenda via lldb-commits
lldb-commits at lists.llvm.org
Wed Feb 17 23:52:37 PST 2021
Author: Jason Molenda
Date: 2021-02-17T23:52:28-08:00
New Revision: fcdef15d77bde8a200cd28242077cd2496f138a4
URL: https://github.com/llvm/llvm-project/commit/fcdef15d77bde8a200cd28242077cd2496f138a4
DIFF: https://github.com/llvm/llvm-project/commit/fcdef15d77bde8a200cd28242077cd2496f138a4.diff
LOG: Add a new Row setting to mark all un-declared regs as Undefined
Add a new state for UnwindPlan::Row which indicates that any
register not listed is not defined, and should not be found in
stack frames newer than this one and passed up the stack. Mostly
intended for use with architectural default unwind plans that are
used for jitted stack frames, where we have no unwind information
or start address. lldb has no way to tell if registers were
spilled in the jitted frame & overwritten, so passing register
values up the stack is not safe to show the user.
Architectural default unwind plans are also used as a fast unwind
plan on x86_64 in particular, and are used as the fallback unwind
plans when lldb thinks it may be able to work around a problem
which causes the unwinder to stop walking the stack early.
For fast unwind plans, when we don't find a register location in
the arch default unwind plan, we fall back to computing & using
the full unwind plan. One small part of this patch is to know that
a register marked as Undefined in the fast unwind plan is a special
case, and we should continue on to the full unwind plan to find what
the real unwind rule is for this register.
Differential Revision: https://reviews.llvm.org/D96829
<rdar://problem/70398009>
Added:
Modified:
lldb/include/lldb/Symbol/UnwindPlan.h
lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp
lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
lldb/source/Plugins/ABI/ARM/ABIMacOSX_arm.cpp
lldb/source/Plugins/ABI/ARM/ABISysV_arm.cpp
lldb/source/Plugins/ABI/Hexagon/ABISysV_hexagon.cpp
lldb/source/Plugins/ABI/Mips/ABISysV_mips.cpp
lldb/source/Plugins/ABI/Mips/ABISysV_mips64.cpp
lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp
lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc64.cpp
lldb/source/Plugins/ABI/X86/ABIMacOSX_i386.cpp
lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp
lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp
lldb/source/Symbol/UnwindPlan.cpp
lldb/source/Target/RegisterContextUnwind.cpp
Removed:
################################################################################
diff --git a/lldb/include/lldb/Symbol/UnwindPlan.h b/lldb/include/lldb/Symbol/UnwindPlan.h
index 40814da3de4a..06c76ca80796 100644
--- a/lldb/include/lldb/Symbol/UnwindPlan.h
+++ b/lldb/include/lldb/Symbol/UnwindPlan.h
@@ -360,6 +360,25 @@ class UnwindPlan {
bool SetRegisterLocationToSame(uint32_t reg_num, bool must_replace);
+ // When this UnspecifiedRegistersAreUndefined mode is
+ // set, any register that is not specified by this Row will
+ // be described as Undefined.
+ // This will prevent the unwinder from iterating down the
+ // stack looking for a spill location, or a live register value
+ // at frame 0.
+ // It would be used for an UnwindPlan row where we can't track
+ // spilled registers -- for instance a jitted stack frame where
+ // we have no unwind information or start address -- and registers
+ // MAY have been spilled and overwritten, so providing the
+ // spilled/live value from a newer frame may show an incorrect value.
+ void SetUnspecifiedRegistersAreUndefined(bool unspec_is_undef) {
+ m_unspecified_registers_are_undefined = unspec_is_undef;
+ }
+
+ bool GetUnspecifiedRegistersAreUndefined() {
+ return m_unspecified_registers_are_undefined;
+ }
+
void Clear();
void Dump(Stream &s, const UnwindPlan *unwind_plan, Thread *thread,
@@ -372,6 +391,7 @@ class UnwindPlan {
FAValue m_cfa_value;
FAValue m_afa_value;
collection m_register_locations;
+ bool m_unspecified_registers_are_undefined;
}; // class Row
typedef std::shared_ptr<Row> RowSP;
diff --git a/lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp b/lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp
index ea0c09a1596a..861310e3ea0c 100644
--- a/lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp
+++ b/lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp
@@ -384,6 +384,7 @@ bool ABIMacOSX_arm64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp b/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
index 5918e2ccb5fa..0f74c1f5c73b 100644
--- a/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
+++ b/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
@@ -356,6 +356,7 @@ bool ABISysV_arm64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Plugins/ABI/ARM/ABIMacOSX_arm.cpp b/lldb/source/Plugins/ABI/ARM/ABIMacOSX_arm.cpp
index 06c4590b7740..e429f3ee0cc4 100644
--- a/lldb/source/Plugins/ABI/ARM/ABIMacOSX_arm.cpp
+++ b/lldb/source/Plugins/ABI/ARM/ABIMacOSX_arm.cpp
@@ -1824,6 +1824,7 @@ bool ABIMacOSX_arm::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Plugins/ABI/ARM/ABISysV_arm.cpp b/lldb/source/Plugins/ABI/ARM/ABISysV_arm.cpp
index 26b3152bed16..8a9be3fb67c7 100644
--- a/lldb/source/Plugins/ABI/ARM/ABISysV_arm.cpp
+++ b/lldb/source/Plugins/ABI/ARM/ABISysV_arm.cpp
@@ -1940,6 +1940,7 @@ bool ABISysV_arm::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Plugins/ABI/Hexagon/ABISysV_hexagon.cpp b/lldb/source/Plugins/ABI/Hexagon/ABISysV_hexagon.cpp
index 47aaefd3b228..6794f7d07210 100644
--- a/lldb/source/Plugins/ABI/Hexagon/ABISysV_hexagon.cpp
+++ b/lldb/source/Plugins/ABI/Hexagon/ABISysV_hexagon.cpp
@@ -1225,6 +1225,7 @@ bool ABISysV_hexagon::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
UnwindPlan::RowSP row(new UnwindPlan::Row);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->GetCFAValue().SetIsRegisterPlusOffset(LLDB_REGNUM_GENERIC_FP, 8);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, -8, true);
diff --git a/lldb/source/Plugins/ABI/Mips/ABISysV_mips.cpp b/lldb/source/Plugins/ABI/Mips/ABISysV_mips.cpp
index d66e0926ad99..538ec06c3b0d 100644
--- a/lldb/source/Plugins/ABI/Mips/ABISysV_mips.cpp
+++ b/lldb/source/Plugins/ABI/Mips/ABISysV_mips.cpp
@@ -985,6 +985,7 @@ bool ABISysV_mips::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
UnwindPlan::RowSP row(new UnwindPlan::Row);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_r29, 0);
row->SetRegisterLocationToRegister(dwarf_pc, dwarf_r31, true);
diff --git a/lldb/source/Plugins/ABI/Mips/ABISysV_mips64.cpp b/lldb/source/Plugins/ABI/Mips/ABISysV_mips64.cpp
index 5e72af076f66..7220508c75ff 100644
--- a/lldb/source/Plugins/ABI/Mips/ABISysV_mips64.cpp
+++ b/lldb/source/Plugins/ABI/Mips/ABISysV_mips64.cpp
@@ -1156,6 +1156,7 @@ bool ABISysV_mips64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
UnwindPlan::RowSP row(new UnwindPlan::Row);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_r29, 0);
row->SetRegisterLocationToRegister(dwarf_pc, dwarf_r31, true);
diff --git a/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp b/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp
index d5605642d623..cfecf35da1ed 100644
--- a/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp
+++ b/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp
@@ -900,6 +900,7 @@ bool ABISysV_ppc::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
UnwindPlan::RowSP row(new UnwindPlan::Row);
const int32_t ptr_size = 4;
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->GetCFAValue().SetIsRegisterDereferenced(sp_reg_num);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 1, true);
diff --git a/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc64.cpp b/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc64.cpp
index 603143190dc5..7cc9482e7c5d 100644
--- a/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc64.cpp
+++ b/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc64.cpp
@@ -1003,6 +1003,7 @@ bool ABISysV_ppc64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
UnwindPlan::RowSP row(new UnwindPlan::Row);
const int32_t ptr_size = 8;
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->GetCFAValue().SetIsRegisterDereferenced(sp_reg_num);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 2, true);
diff --git a/lldb/source/Plugins/ABI/X86/ABIMacOSX_i386.cpp b/lldb/source/Plugins/ABI/X86/ABIMacOSX_i386.cpp
index 89112deb2c4a..461e4af599d3 100644
--- a/lldb/source/Plugins/ABI/X86/ABIMacOSX_i386.cpp
+++ b/lldb/source/Plugins/ABI/X86/ABIMacOSX_i386.cpp
@@ -389,6 +389,7 @@ bool ABIMacOSX_i386::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp b/lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp
index 38d7364aaa51..7d2f0a64d679 100644
--- a/lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp
+++ b/lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp
@@ -652,6 +652,7 @@ bool ABISysV_i386::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp b/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
index 8d5614756a6a..196b45b3b6da 100644
--- a/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
+++ b/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
@@ -887,6 +887,7 @@ bool ABISysV_x86_64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
const int32_t ptr_size = 8;
row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_rbp, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp b/lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp
index da241458840f..6c473c652c5f 100644
--- a/lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp
+++ b/lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp
@@ -767,6 +767,7 @@ bool ABIWindows_x86_64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
const int32_t ptr_size = 8;
row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_rbp, 2 * ptr_size);
row->SetOffset(0);
+ row->SetUnspecifiedRegistersAreUndefined(true);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);
diff --git a/lldb/source/Symbol/UnwindPlan.cpp b/lldb/source/Symbol/UnwindPlan.cpp
index d24cabed14ce..d74c78f084af 100644
--- a/lldb/source/Symbol/UnwindPlan.cpp
+++ b/lldb/source/Symbol/UnwindPlan.cpp
@@ -217,6 +217,7 @@ void UnwindPlan::Row::Clear() {
m_cfa_value.SetUnspecified();
m_afa_value.SetUnspecified();
m_offset = 0;
+ m_unspecified_registers_are_undefined = false;
m_register_locations.clear();
}
@@ -242,11 +243,11 @@ void UnwindPlan::Row::Dump(Stream &s, const UnwindPlan *unwind_plan,
idx->second.Dump(s, unwind_plan, this, thread, verbose);
s.PutChar(' ');
}
- s.EOL();
}
UnwindPlan::Row::Row()
- : m_offset(0), m_cfa_value(), m_afa_value(), m_register_locations() {}
+ : m_offset(0), m_cfa_value(), m_afa_value(), m_register_locations(),
+ m_unspecified_registers_are_undefined(false) {}
bool UnwindPlan::Row::GetRegisterInfo(
uint32_t reg_num,
@@ -256,6 +257,10 @@ bool UnwindPlan::Row::GetRegisterInfo(
register_location = pos->second;
return true;
}
+ if (m_unspecified_registers_are_undefined) {
+ register_location.SetUndefined();
+ return true;
+ }
return false;
}
@@ -348,10 +353,11 @@ bool UnwindPlan::Row::SetRegisterLocationToSame(uint32_t reg_num,
}
bool UnwindPlan::Row::operator==(const UnwindPlan::Row &rhs) const {
- return m_offset == rhs.m_offset &&
- m_cfa_value == rhs.m_cfa_value &&
- m_afa_value == rhs.m_afa_value &&
- m_register_locations == rhs.m_register_locations;
+ return m_offset == rhs.m_offset && m_cfa_value == rhs.m_cfa_value &&
+ m_afa_value == rhs.m_afa_value &&
+ m_unspecified_registers_are_undefined ==
+ rhs.m_unspecified_registers_are_undefined &&
+ m_register_locations == rhs.m_register_locations;
}
void UnwindPlan::AppendRow(const UnwindPlan::RowSP &row_sp) {
@@ -552,6 +558,7 @@ void UnwindPlan::Dump(Stream &s, Thread *thread, lldb::addr_t base_addr) const {
for (pos = begin; pos != end; ++pos) {
s.Printf("row[%u]: ", (uint32_t)std::distance(begin, pos));
(*pos)->Dump(s, this, thread, base_addr);
+ s.Printf("\n");
}
}
diff --git a/lldb/source/Target/RegisterContextUnwind.cpp b/lldb/source/Target/RegisterContextUnwind.cpp
index 991a3c821923..a677121d8279 100644
--- a/lldb/source/Target/RegisterContextUnwind.cpp
+++ b/lldb/source/Target/RegisterContextUnwind.cpp
@@ -542,6 +542,8 @@ void RegisterContextUnwind::InitializeNonZerothFrame() {
StreamString active_row_strm;
active_row->Dump(active_row_strm, m_fast_unwind_plan_sp.get(), &m_thread,
m_start_pc.GetLoadAddress(exe_ctx.GetTargetPtr()));
+ UnwindLogMsg("Using fast unwind plan '%s'",
+ m_fast_unwind_plan_sp->GetSourceName().AsCString());
UnwindLogMsg("active row: %s", active_row_strm.GetData());
}
} else {
@@ -556,6 +558,8 @@ void RegisterContextUnwind::InitializeNonZerothFrame() {
active_row->Dump(active_row_strm, m_full_unwind_plan_sp.get(),
&m_thread,
m_start_pc.GetLoadAddress(exe_ctx.GetTargetPtr()));
+ UnwindLogMsg("Using full unwind plan '%s'",
+ m_full_unwind_plan_sp->GetSourceName().AsCString());
UnwindLogMsg("active row: %s", active_row_strm.GetData());
}
}
@@ -662,13 +666,6 @@ UnwindPlanSP RegisterContextUnwind::GetFastUnwindPlanForFrame() {
*m_thread.CalculateTarget(), m_thread);
if (unwind_plan_sp) {
if (unwind_plan_sp->PlanValidAtAddress(m_current_pc)) {
- Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
- if (log && log->GetVerbose()) {
- if (m_fast_unwind_plan_sp)
- UnwindLogMsgVerbose("frame, and has a fast UnwindPlan");
- else
- UnwindLogMsgVerbose("frame");
- }
m_frame_type = eNormalFrame;
return unwind_plan_sp;
} else {
@@ -1147,6 +1144,7 @@ enum UnwindLLDB::RegisterSearchResult
RegisterContextUnwind::SavedLocationForRegister(
uint32_t lldb_regnum, lldb_private::UnwindLLDB::RegisterLocation ®loc) {
RegisterNumber regnum(m_thread, eRegisterKindLLDB, lldb_regnum);
+ Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
// Have we already found this register location?
if (!m_registers.empty()) {
@@ -1179,8 +1177,17 @@ RegisterContextUnwind::SavedLocationForRegister(
(int)unwindplan_registerkind);
return UnwindLLDB::RegisterSearchResult::eRegisterNotFound;
}
+ // The architecture default unwind plan marks unknown registers as
+ // Undefined so that we don't forward them up the stack when a
+ // jitted stack frame may have overwritten them. But when the
+ // arch default unwind plan is used as the Fast Unwind Plan, we
+ // need to recognize this & switch over to the Full Unwind Plan
+ // to see what unwind rule that (more knoweldgeable, probably)
+ // UnwindPlan has. If the full UnwindPlan says the register
+ // location is Undefined, then it really is.
if (active_row->GetRegisterInfo(regnum.GetAsKind(unwindplan_registerkind),
- unwindplan_regloc)) {
+ unwindplan_regloc) &&
+ !unwindplan_regloc.IsUndefined()) {
UnwindLogMsg(
"supplying caller's saved %s (%d)'s location using FastUnwindPlan",
regnum.GetName(), regnum.GetAsKind(eRegisterKindLLDB));
@@ -1191,8 +1198,11 @@ RegisterContextUnwind::SavedLocationForRegister(
if (!have_unwindplan_regloc) {
// m_full_unwind_plan_sp being NULL means that we haven't tried to find a
// full UnwindPlan yet
- if (!m_full_unwind_plan_sp)
+ bool got_new_full_unwindplan = false;
+ if (!m_full_unwind_plan_sp) {
m_full_unwind_plan_sp = GetFullUnwindPlanForFrame();
+ got_new_full_unwindplan = true;
+ }
if (m_full_unwind_plan_sp) {
RegisterNumber pc_regnum(m_thread, eRegisterKindGeneric,
@@ -1202,6 +1212,16 @@ RegisterContextUnwind::SavedLocationForRegister(
m_full_unwind_plan_sp->GetRowForFunctionOffset(m_current_offset);
unwindplan_registerkind = m_full_unwind_plan_sp->GetRegisterKind();
+ if (got_new_full_unwindplan && active_row.get() && log) {
+ StreamString active_row_strm;
+ ExecutionContext exe_ctx(m_thread.shared_from_this());
+ active_row->Dump(active_row_strm, m_full_unwind_plan_sp.get(),
+ &m_thread,
+ m_start_pc.GetLoadAddress(exe_ctx.GetTargetPtr()));
+ UnwindLogMsg("Using full unwind plan '%s'",
+ m_full_unwind_plan_sp->GetSourceName().AsCString());
+ UnwindLogMsg("active row: %s", active_row_strm.GetData());
+ }
RegisterNumber return_address_reg;
// If we're fetching the saved pc and this UnwindPlan defines a
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