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| //===-- StackID.h -----------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_StackID_h_
#define liblldb_StackID_h_
#include "lldb/Core/AddressRange.h"
#include "lldb/lldb-private.h"
namespace lldb_private {
class StackID {
public:
// Constructors and Destructors
StackID()
: m_pc(LLDB_INVALID_ADDRESS), m_cfa(LLDB_INVALID_ADDRESS),
m_symbol_scope(nullptr) {}
explicit StackID(lldb::addr_t pc, lldb::addr_t cfa,
SymbolContextScope *symbol_scope)
: m_pc(pc), m_cfa(cfa), m_symbol_scope(symbol_scope) {}
StackID(const StackID &rhs)
: m_pc(rhs.m_pc), m_cfa(rhs.m_cfa), m_symbol_scope(rhs.m_symbol_scope) {}
~StackID() = default;
lldb::addr_t GetPC() const { return m_pc; }
lldb::addr_t GetCallFrameAddress() const { return m_cfa; }
SymbolContextScope *GetSymbolContextScope() const { return m_symbol_scope; }
void SetSymbolContextScope(SymbolContextScope *symbol_scope) {
m_symbol_scope = symbol_scope;
}
void Clear() {
m_pc = LLDB_INVALID_ADDRESS;
m_cfa = LLDB_INVALID_ADDRESS;
m_symbol_scope = nullptr;
}
bool IsValid() const {
return m_pc != LLDB_INVALID_ADDRESS || m_cfa != LLDB_INVALID_ADDRESS;
}
void Dump(Stream *s);
// Operators
const StackID &operator=(const StackID &rhs) {
if (this != &rhs) {
m_pc = rhs.m_pc;
m_cfa = rhs.m_cfa;
m_symbol_scope = rhs.m_symbol_scope;
}
return *this;
}
protected:
friend class StackFrame;
void SetPC(lldb::addr_t pc) { m_pc = pc; }
void SetCFA(lldb::addr_t cfa) { m_cfa = cfa; }
lldb::addr_t
m_pc; // The pc value for the function/symbol for this frame. This will
// only get used if the symbol scope is nullptr (the code where we are
// stopped is not represented by any function or symbol in any shared
// library).
lldb::addr_t m_cfa; // The call frame address (stack pointer) value
// at the beginning of the function that uniquely
// identifies this frame (along with m_symbol_scope
// below)
SymbolContextScope *
m_symbol_scope; // If nullptr, there is no block or symbol for this frame.
// If not nullptr, this will either be the scope for the
// lexical block for the frame, or the scope for the
// symbol. Symbol context scopes are always be unique
// pointers since the are part of the Block and Symbol
// objects and can easily be used to tell if a stack ID
// is the same as another.
};
bool operator==(const StackID &lhs, const StackID &rhs);
bool operator!=(const StackID &lhs, const StackID &rhs);
// frame_id_1 < frame_id_2 means "frame_id_1 is YOUNGER than frame_id_2"
bool operator<(const StackID &lhs, const StackID &rhs);
} // namespace lldb_private
#endif // liblldb_StackID_h_
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