diff options
Diffstat (limited to 'include/lldb/Symbol/UnwindPlan.h')
| -rw-r--r-- | include/lldb/Symbol/UnwindPlan.h | 248 |
1 files changed, 190 insertions, 58 deletions
diff --git a/include/lldb/Symbol/UnwindPlan.h b/include/lldb/Symbol/UnwindPlan.h index c482739cb8f6..bfc008a5b6bc 100644 --- a/include/lldb/Symbol/UnwindPlan.h +++ b/include/lldb/Symbol/UnwindPlan.h @@ -237,17 +237,178 @@ public: } m_location; }; + class CFAValue + { + public: + + enum ValueType + { + unspecified, // not specified + isRegisterPlusOffset, // CFA = register + offset + isRegisterDereferenced, // CFA = [reg] + isDWARFExpression // CFA = eval(dwarf_expr) + }; + + CFAValue() : + m_type(unspecified), + m_value() + { + } + + bool + operator == (const CFAValue& rhs) const; + + bool + operator != (const CFAValue &rhs) const + { + return !(*this == rhs); + } + + void + SetUnspecified() + { + m_type = unspecified; + } + + bool + IsUnspecified () const + { + return m_type == unspecified; + } + + bool + IsRegisterPlusOffset () const + { + return m_type == isRegisterPlusOffset; + } + + void + SetIsRegisterPlusOffset (uint32_t reg_num, int32_t offset) + { + m_type = isRegisterPlusOffset; + m_value.reg.reg_num = reg_num; + m_value.reg.offset = offset; + } + + bool + IsRegisterDereferenced () const + { + return m_type == isRegisterDereferenced; + } + + void + SetIsRegisterDereferenced (uint32_t reg_num) + { + m_type = isRegisterDereferenced; + m_value.reg.reg_num = reg_num; + } + + bool + IsDWARFExpression () const + { + return m_type == isDWARFExpression; + } + + void + SetIsDWARFExpression (const uint8_t *opcodes, uint32_t len) + { + m_type = isDWARFExpression; + m_value.expr.opcodes = opcodes; + m_value.expr.length = len; + } + + uint32_t + GetRegisterNumber () const + { + if (m_type == isRegisterDereferenced || m_type == isRegisterPlusOffset) + return m_value.reg.reg_num; + return LLDB_INVALID_REGNUM; + } + + ValueType + GetValueType () const + { + return m_type; + } + + int32_t + GetOffset () const + { + if (m_type == isRegisterPlusOffset) + return m_value.reg.offset; + return 0; + } + + void IncOffset (int32_t delta) + { + if (m_type == isRegisterPlusOffset) + m_value.reg.offset += delta; + } + + void SetOffset (int32_t offset) + { + if (m_type == isRegisterPlusOffset) + m_value.reg.offset = offset; + } + + void + GetDWARFExpr (const uint8_t **opcodes, uint16_t& len) const + { + if (m_type == isDWARFExpression) + { + *opcodes = m_value.expr.opcodes; + len = m_value.expr.length; + } + else + { + *opcodes = NULL; + len = 0; + } + } + + const uint8_t * + GetDWARFExpressionBytes () + { + if (m_type == isDWARFExpression) + return m_value.expr.opcodes; + return NULL; + } + + int + GetDWARFExpressionLength () + { + if (m_type == isDWARFExpression) + return m_value.expr.length; + return 0; + } + + void + Dump (Stream &s, + const UnwindPlan* unwind_plan, + Thread* thread) const; + + private: + ValueType m_type; // How do we compute CFA value? + union + { + struct { + // For m_type == isRegisterPlusOffset or m_type == isRegisterDereferenced + uint32_t reg_num; // The register number + // For m_type == isRegisterPlusOffset + int32_t offset; + } reg; + // For m_type == isDWARFExpression + struct { + const uint8_t *opcodes; + uint16_t length; + } expr; + } m_value; + }; // class CFAValue + public: Row (); - - Row (const UnwindPlan::Row& rhs) : - m_offset (rhs.m_offset), - m_cfa_type (rhs.m_cfa_type), - m_cfa_reg_num (rhs.m_cfa_reg_num), - m_cfa_offset (rhs.m_cfa_offset), - m_register_locations (rhs.m_register_locations) - { - } + + Row (const UnwindPlan::Row& rhs) = default; bool operator == (const Row &rhs) const; @@ -279,47 +440,9 @@ public: m_offset += offset; } - // How we can reconstruct the CFA address for this stack frame, at this location - enum CFAType - { - CFAIsRegisterPlusOffset, // the CFA value in a register plus (or minus) an offset - CFAIsRegisterDereferenced // the address in a register is dereferenced to get CFA value - }; - - CFAType - GetCFAType () const - { - return m_cfa_type; - } - - void - SetCFAType (CFAType cfa_type) + CFAValue& GetCFAValue() { - m_cfa_type = cfa_type; - } - - // If GetCFAType() is CFAIsRegisterPlusOffset, add GetCFAOffset to the reg value to get CFA value - // If GetCFAType() is CFAIsRegisterDereferenced, dereference the addr in the reg to get CFA value - uint32_t - GetCFARegister () const - { - return m_cfa_reg_num; - } - - void - SetCFARegister (uint32_t reg_num); - - // This should not be used when GetCFAType() is CFAIsRegisterDereferenced; will return 0 in that case. - int32_t - GetCFAOffset () const - { - return m_cfa_offset; - } - - void - SetCFAOffset (int32_t offset) - { - m_cfa_offset = offset; + return m_cfa_value; } bool @@ -360,14 +483,7 @@ public: typedef std::map<uint32_t, RegisterLocation> collection; lldb::addr_t m_offset; // Offset into the function for this row - CFAType m_cfa_type; - - // If m_cfa_type == CFAIsRegisterPlusOffset, the CFA address is computed as m_cfa_reg_num + m_cfa_offset - // If m_cfa_type == CFAIsRegisterDereferenced, the CFA address is computed as *(m_cfa_reg_num) - i.e. the - // address in m_cfa_reg_num is dereferenced and the pointer value read is the CFA addr. - uint32_t m_cfa_reg_num; // The Call Frame Address register number - int32_t m_cfa_offset; // The offset from the CFA for this row - + CFAValue m_cfa_value; collection m_register_locations; }; // class Row @@ -388,6 +504,22 @@ public: { } + // Performs a deep copy of the plan, including all the rows (expensive). + UnwindPlan (const UnwindPlan &rhs) : + m_plan_valid_address_range (rhs.m_plan_valid_address_range), + m_register_kind (rhs.m_register_kind), + m_return_addr_register (rhs.m_return_addr_register), + m_source_name (rhs.m_source_name), + m_plan_is_sourced_from_compiler (rhs.m_plan_is_sourced_from_compiler), + m_plan_is_valid_at_all_instruction_locations (rhs.m_plan_is_valid_at_all_instruction_locations), + m_lsda_address (rhs.m_lsda_address), + m_personality_func_addr (rhs.m_personality_func_addr) + { + m_row_list.reserve (rhs.m_row_list.size()); + for (const RowSP &row_sp: rhs.m_row_list) + m_row_list.emplace_back (new Row (*row_sp)); + } + ~UnwindPlan () { } @@ -437,7 +569,7 @@ public: { if (m_row_list.empty()) return LLDB_INVALID_REGNUM; - return m_row_list.front()->GetCFARegister(); + return m_row_list.front()->GetCFAValue().GetRegisterNumber(); } // This UnwindPlan may not be valid at every address of the function span. |