labath created this revision.
labath added reviewers: jasonmolenda, aprantl.
Some (but not all) of the unwind plan creation functions were checking
the validity of their address range before they attempted to create the
unwind plan.
Since a FuncUnwinders object cannot do anything reasonable with an
invalid address range, in this patch I remove the checks in from the
creation functions, and instead make it's validity a class invariant.
This makes it the responsibility of whoever's creating the FuncUnwinders
to ensure it does that with a valid address range, which is easy to
achieve as there is only one place we are doing that.
https://reviews.llvm.org/D61004
Files:
include/lldb/Symbol/FuncUnwinders.h
source/Symbol/FuncUnwinders.cpp
source/Symbol/UnwindTable.cpp
Index: source/Symbol/UnwindTable.cpp
===================================================================
--- source/Symbol/UnwindTable.cpp
+++ source/Symbol/UnwindTable.cpp
@@ -89,11 +89,13 @@
return range;
// Does the eh_frame unwind info has a function bounds for this addr?
- if (m_eh_frame_up && m_eh_frame_up->GetAddressRange(addr, range))
+ if (m_eh_frame_up && m_eh_frame_up->GetAddressRange(addr, range) &&
+ range.GetBaseAddress().IsValid())
return range;
// Try debug_frame as well
- if (m_debug_frame_up && m_debug_frame_up->GetAddressRange(addr, range))
+ if (m_debug_frame_up && m_debug_frame_up->GetAddressRange(addr, range) &&
+ range.GetBaseAddress().IsValid())
return range;
return llvm::None;
Index: source/Symbol/FuncUnwinders.cpp
===================================================================
--- source/Symbol/FuncUnwinders.cpp
+++ source/Symbol/FuncUnwinders.cpp
@@ -45,7 +45,9 @@
m_tried_unwind_plan_arm_unwind(false), m_tried_unwind_fast(false),
m_tried_unwind_arch_default(false),
m_tried_unwind_arch_default_at_func_entry(false),
- m_first_non_prologue_insn() {}
+ m_first_non_prologue_insn() {
+ assert(range.GetBaseAddress().IsValid());
+}
/// destructor
@@ -75,17 +77,15 @@
return UnwindPlanSP();
m_tried_unwind_plan_compact_unwind = true;
- if (m_range.GetBaseAddress().IsValid()) {
- Address current_pc(m_range.GetBaseAddress());
- CompactUnwindInfo *compact_unwind = m_unwind_table.GetCompactUnwindInfo();
- if (compact_unwind) {
- UnwindPlanSP unwind_plan_sp(new UnwindPlan(lldb::eRegisterKindGeneric));
- if (compact_unwind->GetUnwindPlan(target, current_pc, *unwind_plan_sp)) {
- m_unwind_plan_compact_unwind.push_back(unwind_plan_sp);
- return m_unwind_plan_compact_unwind[0]; // FIXME support multiple
- // compact unwind plans for one
- // func
- }
+ Address current_pc(m_range.GetBaseAddress());
+ CompactUnwindInfo *compact_unwind = m_unwind_table.GetCompactUnwindInfo();
+ if (compact_unwind) {
+ UnwindPlanSP unwind_plan_sp(new UnwindPlan(lldb::eRegisterKindGeneric));
+ if (compact_unwind->GetUnwindPlan(target, current_pc, *unwind_plan_sp)) {
+ m_unwind_plan_compact_unwind.push_back(unwind_plan_sp);
+ return m_unwind_plan_compact_unwind[0]; // FIXME support multiple
+ // compact unwind plans for one
+ // func
}
}
return UnwindPlanSP();
@@ -97,14 +97,12 @@
return m_unwind_plan_eh_frame_sp;
m_tried_unwind_plan_eh_frame = true;
- if (m_range.GetBaseAddress().IsValid()) {
- DWARFCallFrameInfo *eh_frame = m_unwind_table.GetEHFrameInfo();
- if (eh_frame) {
- m_unwind_plan_eh_frame_sp =
- std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
- if (!eh_frame->GetUnwindPlan(m_range, *m_unwind_plan_eh_frame_sp))
- m_unwind_plan_eh_frame_sp.reset();
- }
+ DWARFCallFrameInfo *eh_frame = m_unwind_table.GetEHFrameInfo();
+ if (eh_frame) {
+ m_unwind_plan_eh_frame_sp =
+ std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
+ if (!eh_frame->GetUnwindPlan(m_range, *m_unwind_plan_eh_frame_sp))
+ m_unwind_plan_eh_frame_sp.reset();
}
return m_unwind_plan_eh_frame_sp;
}
@@ -115,14 +113,13 @@
return m_unwind_plan_debug_frame_sp;
m_tried_unwind_plan_debug_frame = true;
- if (m_range.GetBaseAddress().IsValid()) {
- DWARFCallFrameInfo *debug_frame = m_unwind_table.GetDebugFrameInfo();
- if (debug_frame) {
- m_unwind_plan_debug_frame_sp =
- std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
- if (!debug_frame->GetUnwindPlan(m_range, *m_unwind_plan_debug_frame_sp))
- m_unwind_plan_debug_frame_sp.reset();
- }
+ DWARFCallFrameInfo *debug_frame = m_unwind_table.GetDebugFrameInfo();
+ if (debug_frame) {
+ m_unwind_plan_debug_frame_sp =
+ std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
+ if (!debug_frame->GetUnwindPlan(m_range,
+ *m_unwind_plan_debug_frame_sp))
+ m_unwind_plan_debug_frame_sp.reset();
}
return m_unwind_plan_debug_frame_sp;
}
@@ -133,16 +130,14 @@
return m_unwind_plan_arm_unwind_sp;
m_tried_unwind_plan_arm_unwind = true;
- if (m_range.GetBaseAddress().IsValid()) {
- Address current_pc(m_range.GetBaseAddress());
- ArmUnwindInfo *arm_unwind_info = m_unwind_table.GetArmUnwindInfo();
- if (arm_unwind_info) {
- m_unwind_plan_arm_unwind_sp =
- std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
- if (!arm_unwind_info->GetUnwindPlan(target, current_pc,
- *m_unwind_plan_arm_unwind_sp))
- m_unwind_plan_arm_unwind_sp.reset();
- }
+ Address current_pc(m_range.GetBaseAddress());
+ ArmUnwindInfo *arm_unwind_info = m_unwind_table.GetArmUnwindInfo();
+ if (arm_unwind_info) {
+ m_unwind_plan_arm_unwind_sp =
+ std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
+ if (!arm_unwind_info->GetUnwindPlan(target, current_pc,
+ *m_unwind_plan_arm_unwind_sp))
+ m_unwind_plan_arm_unwind_sp.reset();
}
return m_unwind_plan_arm_unwind_sp;
}
Index: include/lldb/Symbol/FuncUnwinders.h
===================================================================
--- include/lldb/Symbol/FuncUnwinders.h
+++ include/lldb/Symbol/FuncUnwinders.h
@@ -31,6 +31,9 @@
// instructions are finished for migrating breakpoints past the stack frame
// setup instructions when we don't have line table information.
+ /// Create the FuncUnwinders object for the given address range. The object
+ /// will use the data from the given UnwindTable for UnwindPlan generation.
+ /// The input address range must be valid.
FuncUnwinders(lldb_private::UnwindTable &unwind_table, AddressRange range);
~FuncUnwinders();
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