1 //===-- XCOFFDump.cpp - XCOFF-specific dumper -----------------------------===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file implements the XCOFF-specific dumper for llvm-objdump.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "XCOFFDump.h"
15 
16 #include "llvm-objdump.h"
17 #include "llvm/Demangle/Demangle.h"
18 
19 using namespace llvm;
20 using namespace llvm::object;
21 
22 Error objdump::getXCOFFRelocationValueString(const XCOFFObjectFile *Obj,
23                                              const RelocationRef &Rel,
24                                              SmallVectorImpl<char> &Result) {
25   symbol_iterator SymI = Rel.getSymbol();
26   if (SymI == Obj->symbol_end())
27     return make_error<GenericBinaryError>(
28         "invalid symbol reference in relocation entry",
29         object_error::parse_failed);
30 
31   Expected<StringRef> SymNameOrErr = SymI->getName();
32   if (!SymNameOrErr)
33     return SymNameOrErr.takeError();
34 
35   std::string SymName = (*SymNameOrErr).str();
36   if (Demangle)
37     SymName = demangle(SymName);
38 
39   if (SymbolDescription)
40     SymName = getXCOFFSymbolDescription(createSymbolInfo(Obj, *SymI), SymName);
41 
42   Result.append(SymName.begin(), SymName.end());
43   return Error::success();
44 }
45 
46 Optional<XCOFF::StorageMappingClass>
47 objdump::getXCOFFSymbolCsectSMC(const XCOFFObjectFile *Obj,
48                                 const SymbolRef &Sym) {
49   XCOFFSymbolRef SymRef(Sym.getRawDataRefImpl(), Obj);
50 
51   if (SymRef.hasCsectAuxEnt())
52     return SymRef.getXCOFFCsectAuxEnt32()->StorageMappingClass;
53 
54   return None;
55 }
56 
57 bool objdump::isLabel(const XCOFFObjectFile *Obj, const SymbolRef &Sym) {
58 
59   XCOFFSymbolRef SymRef(Sym.getRawDataRefImpl(), Obj);
60 
61   if (SymRef.hasCsectAuxEnt())
62     return SymRef.getXCOFFCsectAuxEnt32()->isLabel();
63 
64   return false;
65 }
66 
67 std::string objdump::getXCOFFSymbolDescription(const SymbolInfoTy &SymbolInfo,
68                                                StringRef SymbolName) {
69   assert(SymbolInfo.isXCOFF() && "Must be a XCOFFSymInfo.");
70 
71   std::string Result;
72   // Dummy symbols have no symbol index.
73   if (SymbolInfo.XCOFFSymInfo.Index)
74     Result = ("(idx: " + Twine(SymbolInfo.XCOFFSymInfo.Index.getValue()) +
75               ") " + SymbolName)
76                  .str();
77   else
78     Result.append(SymbolName.begin(), SymbolName.end());
79 
80   if (SymbolInfo.XCOFFSymInfo.StorageMappingClass &&
81       !SymbolInfo.XCOFFSymInfo.IsLabel) {
82     const XCOFF::StorageMappingClass Smc =
83         SymbolInfo.XCOFFSymInfo.StorageMappingClass.getValue();
84     Result.append(("[" + XCOFF::getMappingClassString(Smc) + "]").str());
85   }
86 
87   return Result;
88 }
89