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[lldb] Add isConstant mode for FA locations #110726

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merged 3 commits into from
Oct 4, 2024
Merged

[lldb] Add isConstant mode for FA locations #110726

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a23540f
[lldb] Add isConstant mode for FA locations
felipepiovezan Sep 24, 2024
a4b409d
fixup! [lldb] Add isConstant mode for FA locations
felipepiovezan Oct 1, 2024
d1cd2a2
fixup! use process method fix address fixup
felipepiovezan Oct 2, 2024
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12 changes: 12 additions & 0 deletions lldb/include/lldb/Symbol/UnwindPlan.h
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Original file line number Diff line number Diff line change
Expand Up @@ -215,6 +215,7 @@ class UnwindPlan {
isRegisterDereferenced, // FA = [reg]
isDWARFExpression, // FA = eval(dwarf_expr)
isRaSearch, // FA = SP + offset + ???
isConstant, // FA = constant
};

FAValue() : m_value() {}
Expand Down Expand Up @@ -259,6 +260,15 @@ class UnwindPlan {
m_value.expr.length = len;
}

bool IsConstant() const { return m_type == isConstant; }

void SetIsConstant(uint64_t constant) {
m_type = isConstant;
m_value.constant = constant;
}

uint64_t GetConstant() const { return m_value.constant; }

uint32_t GetRegisterNumber() const {
if (m_type == isRegisterDereferenced || m_type == isRegisterPlusOffset)
return m_value.reg.reg_num;
Expand Down Expand Up @@ -329,6 +339,8 @@ class UnwindPlan {
} expr;
// For m_type == isRaSearch
int32_t ra_search_offset;
// For m_type = isConstant
uint64_t constant;
} m_value;
}; // class FAValue

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4 changes: 4 additions & 0 deletions lldb/source/Symbol/UnwindPlan.cpp
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Expand Up @@ -187,6 +187,8 @@ operator==(const UnwindPlan::Row::FAValue &rhs) const {
return !memcmp(m_value.expr.opcodes, rhs.m_value.expr.opcodes,
m_value.expr.length);
break;
case isConstant:
return m_value.constant == rhs.m_value.constant;
}
}
return false;
Expand Down Expand Up @@ -214,6 +216,8 @@ void UnwindPlan::Row::FAValue::Dump(Stream &s, const UnwindPlan *unwind_plan,
case isRaSearch:
s.Printf("RaSearch@SP%+d", m_value.ra_search_offset);
break;
case isConstant:
s.Printf("0x%" PRIx64, m_value.constant);
}
}

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6 changes: 6 additions & 0 deletions lldb/source/Target/RegisterContextUnwind.cpp
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Expand Up @@ -2088,6 +2088,12 @@ bool RegisterContextUnwind::ReadFrameAddress(
UnwindLogMsg("No suitable CFA found");
break;
}
case UnwindPlan::Row::FAValue::isConstant: {
address = fa.GetConstant();
address = m_thread.GetProcess()->FixDataAddress(address);
UnwindLogMsg("CFA value set by constant is 0x%" PRIx64, address);
return true;
}
default:
return false;
}
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