1 //===- BTFContext.cpp ---------------------------------------------------===//
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 // Implementation of the BTFContext interface, this is used by
10 // llvm-objdump tool to print source code alongside disassembly.
11 // In fact, currently it is a simple wrapper for BTFParser instance.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "llvm/DebugInfo/BTF/BTFContext.h"
16
17 #define DEBUG_TYPE "debug-info-btf-context"
18
19 using namespace llvm;
20 using object::ObjectFile;
21 using object::SectionedAddress;
22
23 std::optional<DILineInfo>
getLineInfoForAddress(SectionedAddress Address,DILineInfoSpecifier Specifier)24 BTFContext::getLineInfoForAddress(SectionedAddress Address,
25 DILineInfoSpecifier Specifier) {
26 const BTF::BPFLineInfo *LineInfo = BTF.findLineInfo(Address);
27 DILineInfo Result;
28 if (!LineInfo)
29 return std::nullopt;
30
31 Result.LineSource = BTF.findString(LineInfo->LineOff);
32 Result.FileName = BTF.findString(LineInfo->FileNameOff);
33 Result.Line = LineInfo->getLine();
34 Result.Column = LineInfo->getCol();
35 return Result;
36 }
37
38 std::optional<DILineInfo>
getLineInfoForDataAddress(SectionedAddress Address)39 BTFContext::getLineInfoForDataAddress(SectionedAddress Address) {
40 // BTF does not convey such information.
41 return std::nullopt;
42 }
43
44 DILineInfoTable
getLineInfoForAddressRange(SectionedAddress Address,uint64_t Size,DILineInfoSpecifier Specifier)45 BTFContext::getLineInfoForAddressRange(SectionedAddress Address, uint64_t Size,
46 DILineInfoSpecifier Specifier) {
47 // This function is used only from llvm-rtdyld utility and a few
48 // JITEventListener implementations. Ignore it for now.
49 return {};
50 }
51
52 DIInliningInfo
getInliningInfoForAddress(SectionedAddress Address,DILineInfoSpecifier Specifier)53 BTFContext::getInliningInfoForAddress(SectionedAddress Address,
54 DILineInfoSpecifier Specifier) {
55 // BTF does not convey such information
56 return {};
57 }
58
getLocalsForAddress(SectionedAddress Address)59 std::vector<DILocal> BTFContext::getLocalsForAddress(SectionedAddress Address) {
60 // BTF does not convey such information
61 return {};
62 }
63
64 std::unique_ptr<BTFContext>
create(const ObjectFile & Obj,std::function<void (Error)> ErrorHandler)65 BTFContext::create(const ObjectFile &Obj,
66 std::function<void(Error)> ErrorHandler) {
67 auto Ctx = std::make_unique<BTFContext>();
68 BTFParser::ParseOptions Opts;
69 Opts.LoadLines = true;
70 if (Error E = Ctx->BTF.parse(Obj, Opts))
71 ErrorHandler(std::move(E));
72 return Ctx;
73 }
74