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//===-- StackID.cpp ---------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Target/StackID.h"
#include "lldb/Symbol/Block.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Utility/Stream.h"
using namespace lldb_private;
void StackID::Dump(Stream *s) {
s->Printf("StackID (pc = 0x%16.16" PRIx64 ", cfa = 0x%16.16" PRIx64
", symbol_scope = %p",
m_pc, m_cfa, static_cast<void *>(m_symbol_scope));
if (m_symbol_scope) {
SymbolContext sc;
m_symbol_scope->CalculateSymbolContext(&sc);
if (sc.block)
s->Printf(" (Block {0x%8.8" PRIx64 "})", sc.block->GetID());
else if (sc.symbol)
s->Printf(" (Symbol{0x%8.8x})", sc.symbol->GetID());
}
s->PutCString(") ");
}
bool lldb_private::operator==(const StackID &lhs, const StackID &rhs) {
if (lhs.GetCallFrameAddress() != rhs.GetCallFrameAddress())
return false;
SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
// Only compare the PC values if both symbol context scopes are nullptr
if (lhs_scope == nullptr && rhs_scope == nullptr)
return lhs.GetPC() == rhs.GetPC();
return lhs_scope == rhs_scope;
}
bool lldb_private::operator!=(const StackID &lhs, const StackID &rhs) {
if (lhs.GetCallFrameAddress() != rhs.GetCallFrameAddress())
return true;
SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
if (lhs_scope == nullptr && rhs_scope == nullptr)
return lhs.GetPC() != rhs.GetPC();
return lhs_scope != rhs_scope;
}
bool lldb_private::operator<(const StackID &lhs, const StackID &rhs) {
const lldb::addr_t lhs_cfa = lhs.GetCallFrameAddress();
const lldb::addr_t rhs_cfa = rhs.GetCallFrameAddress();
// FIXME: We are assuming that the stacks grow downward in memory. That's not
// necessary, but true on
// all the machines we care about at present. If this changes, we'll have to
// deal with that. The ABI is the agent who knows this ordering, but the
// StackID has no access to the ABI. The most straightforward way to handle
// this is to add a "m_grows_downward" bool to the StackID, and set it in the
// constructor. But I'm not going to waste a bool per StackID on this till we
// need it.
if (lhs_cfa != rhs_cfa)
return lhs_cfa < rhs_cfa;
SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
if (lhs_scope != nullptr && rhs_scope != nullptr) {
// Same exact scope, lhs is not less than (younger than rhs)
if (lhs_scope == rhs_scope)
return false;
SymbolContext lhs_sc;
SymbolContext rhs_sc;
lhs_scope->CalculateSymbolContext(&lhs_sc);
rhs_scope->CalculateSymbolContext(&rhs_sc);
// Items with the same function can only be compared
if (lhs_sc.function == rhs_sc.function && lhs_sc.function != nullptr &&
lhs_sc.block != nullptr && rhs_sc.function != nullptr &&
rhs_sc.block != nullptr) {
return rhs_sc.block->Contains(lhs_sc.block);
}
}
return false;
}
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