1 //===-- StackID.cpp ---------------------------------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "lldb/Target/StackID.h"
10 #include "lldb/Symbol/Block.h"
11 #include "lldb/Symbol/Symbol.h"
12 #include "lldb/Symbol/SymbolContext.h"
13 #include "lldb/Utility/Stream.h"
15 using namespace lldb_private;
17 void StackID::Dump(Stream *s) {
18 s->Printf("StackID (pc = 0x%16.16" PRIx64 ", cfa = 0x%16.16" PRIx64
19 ", symbol_scope = %p",
20 m_pc, m_cfa, static_cast<void *>(m_symbol_scope));
24 m_symbol_scope->CalculateSymbolContext(&sc);
26 s->Printf(" (Block {0x%8.8" PRIx64 "})", sc.block->GetID());
28 s->Printf(" (Symbol{0x%8.8x})", sc.symbol->GetID());
33 bool lldb_private::operator==(const StackID &lhs, const StackID &rhs) {
34 if (lhs.GetCallFrameAddress() != rhs.GetCallFrameAddress())
37 SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
38 SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
40 // Only compare the PC values if both symbol context scopes are nullptr
41 if (lhs_scope == nullptr && rhs_scope == nullptr)
42 return lhs.GetPC() == rhs.GetPC();
44 return lhs_scope == rhs_scope;
47 bool lldb_private::operator!=(const StackID &lhs, const StackID &rhs) {
48 if (lhs.GetCallFrameAddress() != rhs.GetCallFrameAddress())
51 SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
52 SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
54 if (lhs_scope == nullptr && rhs_scope == nullptr)
55 return lhs.GetPC() != rhs.GetPC();
57 return lhs_scope != rhs_scope;
60 bool lldb_private::operator<(const StackID &lhs, const StackID &rhs) {
61 const lldb::addr_t lhs_cfa = lhs.GetCallFrameAddress();
62 const lldb::addr_t rhs_cfa = rhs.GetCallFrameAddress();
64 // FIXME: We are assuming that the stacks grow downward in memory. That's not
65 // necessary, but true on
66 // all the machines we care about at present. If this changes, we'll have to
67 // deal with that. The ABI is the agent who knows this ordering, but the
68 // StackID has no access to the ABI. The most straightforward way to handle
69 // this is to add a "m_grows_downward" bool to the StackID, and set it in the
70 // constructor. But I'm not going to waste a bool per StackID on this till we
73 if (lhs_cfa != rhs_cfa)
74 return lhs_cfa < rhs_cfa;
76 SymbolContextScope *lhs_scope = lhs.GetSymbolContextScope();
77 SymbolContextScope *rhs_scope = rhs.GetSymbolContextScope();
79 if (lhs_scope != nullptr && rhs_scope != nullptr) {
80 // Same exact scope, lhs is not less than (younger than rhs)
81 if (lhs_scope == rhs_scope)
86 lhs_scope->CalculateSymbolContext(&lhs_sc);
87 rhs_scope->CalculateSymbolContext(&rhs_sc);
89 // Items with the same function can only be compared
90 if (lhs_sc.function == rhs_sc.function && lhs_sc.function != nullptr &&
91 lhs_sc.block != nullptr && rhs_sc.function != nullptr &&
92 rhs_sc.block != nullptr) {
93 return rhs_sc.block->Contains(lhs_sc.block);