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98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
//===-- StackID.cpp ---------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Target/StackID.h"
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#include "lldb/Symbol/Block.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Symbol/SymbolContext.h"
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#include "lldb/Utility/Stream.h"
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using namespace lldb_private;
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void StackID::Dump(Stream *s) {
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s->Printf("StackID (pc = 0x%16.16" PRIx64 ", cfa = 0x%16.16" PRIx64
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", symbol_scope = %p",
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m_pc, m_cfa, static_cast<void *>(m_symbol_scope));
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if (m_symbol_scope) {
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SymbolContext sc;
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m_symbol_scope->CalculateSymbolContext(&sc);
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if (sc.block)
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s->Printf(" (Block {0x%8.8" PRIx64 "})", sc.block->GetID());
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else if (sc.symbol)
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s->Printf(" (Symbol{0x%8.8x})", sc.symbol->GetID());
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}
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s->PutCString(") ");
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}
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bool lldb_private::operator==(const StackID &lhs, const StackID &rhs) {
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if (lhs.GetCallFrameAddress() != rhs.GetCallFrameAddress())
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return false;
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SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
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SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
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// Only compare the PC values if both symbol context scopes are nullptr
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if (lhs_scope == nullptr && rhs_scope == nullptr)
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return lhs.GetPC() == rhs.GetPC();
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return lhs_scope == rhs_scope;
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}
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bool lldb_private::operator!=(const StackID &lhs, const StackID &rhs) {
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if (lhs.GetCallFrameAddress() != rhs.GetCallFrameAddress())
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return true;
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SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
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SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
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if (lhs_scope == nullptr && rhs_scope == nullptr)
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return lhs.GetPC() != rhs.GetPC();
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return lhs_scope != rhs_scope;
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}
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bool lldb_private::operator<(const StackID &lhs, const StackID &rhs) {
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const lldb::addr_t lhs_cfa = lhs.GetCallFrameAddress();
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const lldb::addr_t rhs_cfa = rhs.GetCallFrameAddress();
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// FIXME: We are assuming that the stacks grow downward in memory. That's not
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// necessary, but true on
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// all the machines we care about at present. If this changes, we'll have to
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// deal with that. The ABI is the agent who knows this ordering, but the
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// StackID has no access to the ABI. The most straightforward way to handle
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// this is to add a "m_grows_downward" bool to the StackID, and set it in the
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// constructor. But I'm not going to waste a bool per StackID on this till we
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// need it.
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if (lhs_cfa != rhs_cfa)
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return lhs_cfa < rhs_cfa;
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SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
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SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
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if (lhs_scope != nullptr && rhs_scope != nullptr) {
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// Same exact scope, lhs is not less than (younger than rhs)
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if (lhs_scope == rhs_scope)
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return false;
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SymbolContext lhs_sc;
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SymbolContext rhs_sc;
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lhs_scope->CalculateSymbolContext(&lhs_sc);
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rhs_scope->CalculateSymbolContext(&rhs_sc);
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// Items with the same function can only be compared
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if (lhs_sc.function == rhs_sc.function && lhs_sc.function != nullptr &&
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lhs_sc.block != nullptr && rhs_sc.function != nullptr &&
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rhs_sc.block != nullptr) {
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return rhs_sc.block->Contains(lhs_sc.block);
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}
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}
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return false;
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}
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