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Differential D107029

[llvm-objdump][CallGraphInfo] Add CallGraphInfo option, extract functions
AcceptedPublic

Authored by necipfazil on Jul 28 2021, 9:50 PM.

Details

Reviewers
jhenderson
MaskRay
kcc
morehouse
Summary

Add llvm-objdump --call-graph-info option to disassemble the binary and parse
the .callgraph section for call graph information.

This patch extracts and prints function entry address to name mapping.
This can be used to annotate function nodes on a reconstructed call
graph. Upcoming patches will add the rest of the functionality (call
site info and .callgraph section parsing).

Patch 2/6: Extract call graph information from binary

Original RFC: https://lists.llvm.org/pipermail/llvm-dev/2021-June/151044.html
Updated RFC: https://lists.llvm.org/pipermail/llvm-dev/2021-July/151739.html

Diff Detail

Event Timeline

necipfazil created this revision.Jul 28 2021, 9:50 PM
Herald added a reviewer: jhenderson. · View Herald TranscriptJul 28 2021, 9:50 PM
Herald added a reviewer: MaskRay. · View Herald Transcript
Herald added subscribers: rupprecht, emaste. · View Herald Transcript
necipfazil requested review of this revision.Jul 28 2021, 9:50 PM
Herald added a project: Restricted Project. · View Herald TranscriptJul 28 2021, 9:50 PM
Herald added a subscriber: llvm-commits. · View Herald Transcript
Harbormaster completed remote builds in B116864: Diff 362625.Jul 28 2021, 9:50 PM
necipfazil added reviewers: kcc, morehouse.Jul 28 2021, 9:56 PM
necipfazil added a child revision: D107030: [llvm-objdump][CallGraphInfo] Extract and print call site info.Jul 28 2021, 9:59 PM
necipfazil added a parent revision: D107028: [llvm-objdump][NFC] Add quiet disassembly.
necipfazil mentioned this in D105917: [llvm-objdump][CallGraphSection] Extract call graph information from binary.Jul 28 2021, 10:08 PM
morehouse accepted this revision.Jul 29 2021, 3:23 PM

LGTM

This revision is now accepted and ready to land.Jul 29 2021, 3:23 PM
morehouse requested changes to this revision.Jul 29 2021, 3:28 PM
morehouse added inline comments.
llvm/test/tools/llvm-objdump/ELF/call-graph-info-functions.test
12

Will these tests break if DenseMap changes its hash function?

We should probably use a sorted map.

This revision now requires changes to proceed.Jul 29 2021, 3:28 PM
necipfazil updated this revision to Diff 362909.Jul 29 2021, 3:42 PM
necipfazil marked an inline comment as done.

Use stable iteration order for functions

Use MapVector instead of DenseMap to store the functions.

morehouse accepted this revision.Jul 29 2021, 3:47 PM

LGTM

This revision is now accepted and ready to land.Jul 29 2021, 3:47 PM
Harbormaster completed remote builds in B117064: Diff 362909.Jul 29 2021, 4:30 PM

Revision Contents

PathSize
llvm/
docs/
CommandGuide/
5 lines
test/
tools/
llvm-objdump/
ELF/
28 lines
623 lines
tools/
llvm-objdump/
4 lines
35 lines

Diff 362909

llvm/docs/CommandGuide/llvm-objdump.rst

Show All 19 Lines
-------- --------
At least one of the following commands are required, and some commands can be At least one of the following commands are required, and some commands can be
combined with other commands: combined with other commands:
.. option:: -a, --archive-headers .. option:: -a, --archive-headers
Display the information contained within an archive's headers. Display the information contained within an archive's headers.
.. option:: --call-graph-info
Dump call graph information including indirect call and target IDs from call
graph section, if available.
.. option:: -d, --disassemble .. option:: -d, --disassemble
Disassemble all text sections found in the input files. Disassemble all text sections found in the input files.
.. option:: -D, --disassemble-all .. option:: -D, --disassemble-all
Disassemble all sections found in the input files. Disassemble all sections found in the input files.
▲ Show 20 Lines • Show All 369 Lines • Show Last 20 Lines

llvm/test/tools/llvm-objdump/ELF/call-graph-info-functions.test

  • This file was added.
## Tests --call-graph-info prints functions.
# RUN: llvm-mc %s -filetype=obj -triple=x86_64-pc-linux -o %t
# RUN: llvm-objdump --call-graph-info %t 2>&1 | FileCheck %s -DFILE=%t
# CHECK: [[FILE]]: file format elf64-x86-64
# CHECK: FUNCTIONS (FUNC_ENTRY_ADDR, SYM_NAME)
# CHECK-NEXT: 0 foo
# CHECK-NEXT: 1 bar
# CHECK-NEXT: 2 baz
morehouseUnsubmitted
Done
ReplyInline Actions

Will these tests break if DenseMap changes its hash function?

We should probably use a sorted map.

morehouse: Will these tests break if `DenseMap` changes its hash function? We should probably use a…
.text
.globl foo
.type foo,@function
foo:
retq
.globl bar
.type bar,@function
bar:
retq
.globl baz
.type baz,@function
baz:
retq

llvm/test/tools/llvm-objdump/ELF/call-graph-info.test

  • This file was added.
## Tests how --call-graph-info prints the call graph information.
# RUN: yaml2obj --docnum=1 %s -o %t
# RUN: llvm-objdump --call-graph-info %t 2>&1 | FileCheck %s -DFILE=%t
# Yaml input is obtained by compiling the below source to object with:
# clang -fcall-graph-section test.c -o test.o
# then to yaml with:
# obj2yaml test.o > test.yaml
# The content of the .callgraph section is fixed with this yaml in raw format.
# Source:
# void foo() {}
#
# void bar() {}
#
# int baz(char a) {
# return 0;
# }
#
# int main() {
# // Indirect calls.
# void (*fp_foo)() = foo;
# fp_foo();
#
# void (*fp_bar)() = bar;
# fp_bar();
#
# char a;
# int (*fp_baz)(char) = baz;
# fp_baz(a);
#
# // Direct calls.
# foo();
# bar();
# baz(a);
#
# return 0;
# }
# CHECK: [[FILE]]: file format elf64-x86-64
# CHECK: FUNCTIONS (FUNC_ENTRY_ADDR, SYM_NAME)
# CHECK-NEXT: 401000 _init
# CHECK-NEXT: 401020 _start
# CHECK-NEXT: 401050 _dl_relocate_static_pie
# CHECK-NEXT: 401060 deregister_tm_clones
# CHECK-NEXT: 401090 register_tm_clones
# CHECK-NEXT: 4010d0 __do_global_dtors_aux
# CHECK-NEXT: 401100 frame_dummy
# CHECK-NEXT: 401110 foo
# CHECK-NEXT: 401120 bar
# CHECK-NEXT: 401130 baz
# CHECK-NEXT: 401140 main
# CHECK-NEXT: 4011c0 __libc_csu_init
# CHECK-NEXT: 401220 __libc_csu_fini
# CHECK-NEXT: 401224 _fini
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Type: STT_FUNC
Binding: STB_GLOBAL
- Name: __gmon_start__
Binding: STB_WEAK
...

llvm/tools/llvm-objdump/ObjdumpOpts.td

Show All 22 Linesdef arch_name_EQ : Joined<["--"], "arch-name=">,
HelpText<"Target arch to disassemble for, " HelpText<"Target arch to disassemble for, "
"see --version for available targets">; "see --version for available targets">;
def archive_headers : Flag<["--"], "archive-headers">, def archive_headers : Flag<["--"], "archive-headers">,
HelpText<"Display archive header information">; HelpText<"Display archive header information">;
def : Flag<["-"], "a">, Alias<archive_headers>, def : Flag<["-"], "a">, Alias<archive_headers>,
HelpText<"Alias for --archive-headers">; HelpText<"Alias for --archive-headers">;
def call_graph_info : Flag<["--"], "call-graph-info">,
HelpText<"Dump call graph information including indirect call and target IDs "
"from call graph section, if available.">;
def demangle : Flag<["--"], "demangle">, HelpText<"Demangle symbol names">; def demangle : Flag<["--"], "demangle">, HelpText<"Demangle symbol names">;
def : Flag<["-"], "C">, Alias<demangle>, HelpText<"Alias for --demangle">; def : Flag<["-"], "C">, Alias<demangle>, HelpText<"Alias for --demangle">;
def disassemble : Flag<["--"], "disassemble">, def disassemble : Flag<["--"], "disassemble">,
HelpText<"Display assembler mnemonics for the machine instructions">; HelpText<"Display assembler mnemonics for the machine instructions">;
def : Flag<["-"], "d">, Alias<disassemble>, HelpText<"Alias for --disassemble">; def : Flag<["-"], "d">, Alias<disassemble>, HelpText<"Alias for --disassemble">;
def disassemble_all : Flag<["--"], "disassemble-all">, def disassemble_all : Flag<["--"], "disassemble-all">,
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llvm/tools/llvm-objdump/llvm-objdump.cpp

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} // namespace } // namespace
#define DEBUG_TYPE "objdump" #define DEBUG_TYPE "objdump"
static uint64_t AdjustVMA; static uint64_t AdjustVMA;
static bool AllHeaders; static bool AllHeaders;
static std::string ArchName; static std::string ArchName;
bool objdump::ArchiveHeaders; bool objdump::ArchiveHeaders;
static bool CallGraphInfo;
bool objdump::Demangle; bool objdump::Demangle;
bool objdump::Disassemble; bool objdump::Disassemble;
bool objdump::DisassembleAll; bool objdump::DisassembleAll;
bool objdump::SymbolDescription; bool objdump::SymbolDescription;
static std::vector<std::string> DisassembleSymbols; static std::vector<std::string> DisassembleSymbols;
static bool DisassembleZeroes; static bool DisassembleZeroes;
static std::vector<std::string> DisassemblerOptions; static std::vector<std::string> DisassemblerOptions;
DIDumpType objdump::DwarfDumpType; DIDumpType objdump::DwarfDumpType;
Show All 28 Lines
std::string objdump::TripleName; std::string objdump::TripleName;
bool objdump::UnwindInfo; bool objdump::UnwindInfo;
static bool Wide; static bool Wide;
std::string objdump::Prefix; std::string objdump::Prefix;
uint32_t objdump::PrefixStrip; uint32_t objdump::PrefixStrip;
static bool QuietDisasm = false; static bool QuietDisasm = false;
struct FunctionInfo {
std::string Name;
};
// Map function entry pc to function info.
MapVector<uint64_t, FunctionInfo> FuncInfo;
DebugVarsFormat objdump::DbgVariables = DVDisabled; DebugVarsFormat objdump::DbgVariables = DVDisabled;
int objdump::DbgIndent = 52; int objdump::DbgIndent = 52;
static StringSet<> DisasmSymbolSet; static StringSet<> DisasmSymbolSet;
StringSet<> objdump::FoundSectionSet; StringSet<> objdump::FoundSectionSet;
static StringRef ToolName; static StringRef ToolName;
▲ Show 20 Lines • Show All 957 Lines • ▼ Show 20 Lines if (DbgVariables != DVDisabled) {
DICtx = DWARFContext::create(*Obj); DICtx = DWARFContext::create(*Obj);
for (const std::unique_ptr<DWARFUnit> &CU : DICtx->compile_units()) for (const std::unique_ptr<DWARFUnit> &CU : DICtx->compile_units())
LVP.addCompileUnit(CU->getUnitDIE(false)); LVP.addCompileUnit(CU->getUnitDIE(false));
} }
LLVM_DEBUG(LVP.dump()); LLVM_DEBUG(LVP.dump());
for (const SectionRef &Section : ToolSectionFilter(*Obj)) { for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
if (FilterSections.empty() && !DisassembleAll && if (((FilterSections.empty() && !DisassembleAll) || CallGraphInfo) &&
(!Section.isText() || Section.isVirtual())) (!Section.isText() || Section.isVirtual()))
continue; continue;
uint64_t SectionAddr = Section.getAddress(); uint64_t SectionAddr = Section.getAddress();
uint64_t SectSize = Section.getSize(); uint64_t SectSize = Section.getSize();
if (!SectSize) if (!SectSize)
continue; continue;
▲ Show 20 Lines • Show All 156 Lines • ▼ Show 20 Lines for (unsigned SI = 0, SE = Symbols.size(); SI != SE; ++SI) {
bool DumpARMELFData = false; bool DumpARMELFData = false;
formatted_raw_ostream FOS(disasmOuts()); formatted_raw_ostream FOS(disasmOuts());
std::unordered_map<uint64_t, std::string> AllLabels; std::unordered_map<uint64_t, std::string> AllLabels;
if (SymbolizeOperands) if (SymbolizeOperands)
collectLocalBranchTargets(Bytes, MIA, DisAsm, IP, PrimarySTI, collectLocalBranchTargets(Bytes, MIA, DisAsm, IP, PrimarySTI,
SectionAddr, Index, End, AllLabels); SectionAddr, Index, End, AllLabels);
if (CallGraphInfo && Symbols[SI].Type == ELF::STT_FUNC) {
auto FuncPc = Symbols[SI].Addr;
auto FuncName = Symbols[SI].Name.str();
FuncInfo[FuncPc].Name = FuncName;
}
while (Index < End) { while (Index < End) {
// ARM and AArch64 ELF binaries can interleave data and text in the // ARM and AArch64 ELF binaries can interleave data and text in the
// same section. We rely on the markers introduced to understand what // same section. We rely on the markers introduced to understand what
// we need to dump. If the data marker is within a function, it is // we need to dump. If the data marker is within a function, it is
// denoted as a word/short etc. // denoted as a word/short etc.
if (CheckARMELFData) { if (CheckARMELFData) {
char Kind = getMappingSymbolKind(MappingSymbols, Index); char Kind = getMappingSymbolKind(MappingSymbols, Index);
DumpARMELFData = Kind == 'd'; DumpARMELFData = Kind == 'd';
▲ Show 20 Lines • Show All 654 Lines • ▼ Show 20 Linesvoid objdump::printSymbol(const ObjectFile *O, const SymbolRef &Symbol,
} }
if (Demangle) if (Demangle)
outs() << ' ' << demangle(std::string(Name)) << '\n'; outs() << ' ' << demangle(std::string(Name)) << '\n';
else else
outs() << ' ' << Name << '\n'; outs() << ' ' << Name << '\n';
} }
static void printCallGraphInfo(const ObjectFile *Obj) {
// Get function info through disassembly.
disassembleObject(Obj, /*InlineRelocs=*/false);
// Print function entry pc to function name mapping.
outs() << "\n\nFUNCTIONS (FUNC_ENTRY_ADDR, SYM_NAME)";
for (const auto &El : FuncInfo) {
uint64_t EntryPc = El.first;
const auto &Name = El.second.Name;
outs() << "\n" << format("%lx", EntryPc) << " " << Name;
}
outs() << "\n";
}
static void printUnwindInfo(const ObjectFile *O) { static void printUnwindInfo(const ObjectFile *O) {
outs() << "Unwind info:\n\n"; outs() << "Unwind info:\n\n";
if (const COFFObjectFile *Coff = dyn_cast<COFFObjectFile>(O)) if (const COFFObjectFile *Coff = dyn_cast<COFFObjectFile>(O))
printCOFFUnwindInfo(Coff); printCOFFUnwindInfo(Coff);
else if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(O)) else if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(O))
printMachOUnwindInfo(MachO); printMachOUnwindInfo(MachO);
else else
▲ Show 20 Lines • Show All 263 Lines • ▼ Show 20 Linesstatic void dumpObject(ObjectFile *O, const Archive *A = nullptr,
if (WeakBind) if (WeakBind)
printWeakBindTable(O); printWeakBindTable(O);
// Other special sections: // Other special sections:
if (RawClangAST) if (RawClangAST)
printRawClangAST(O); printRawClangAST(O);
if (FaultMapSection) if (FaultMapSection)
printFaultMaps(O); printFaultMaps(O);
if (CallGraphInfo)
printCallGraphInfo(O);
} }
static void dumpObject(const COFFImportFile *I, const Archive *A, static void dumpObject(const COFFImportFile *I, const Archive *A,
const Archive::Child *C = nullptr) { const Archive::Child *C = nullptr) {
StringRef ArchiveName = A ? A->getFileName() : ""; StringRef ArchiveName = A ? A->getFileName() : "";
// Avoid other output when using a raw option. // Avoid other output when using a raw option.
if (!RawClangAST) if (!RawClangAST)
▲ Show 20 Lines • Show All 129 Lines • ▼ Show 20 Linesstatic void parseOtoolOptions(const llvm::opt::InputArgList &InputArgs) {
} }
} }
static void parseObjdumpOptions(const llvm::opt::InputArgList &InputArgs) { static void parseObjdumpOptions(const llvm::opt::InputArgList &InputArgs) {
parseIntArg(InputArgs, OBJDUMP_adjust_vma_EQ, AdjustVMA); parseIntArg(InputArgs, OBJDUMP_adjust_vma_EQ, AdjustVMA);
AllHeaders = InputArgs.hasArg(OBJDUMP_all_headers); AllHeaders = InputArgs.hasArg(OBJDUMP_all_headers);
ArchName = InputArgs.getLastArgValue(OBJDUMP_arch_name_EQ).str(); ArchName = InputArgs.getLastArgValue(OBJDUMP_arch_name_EQ).str();
ArchiveHeaders = InputArgs.hasArg(OBJDUMP_archive_headers); ArchiveHeaders = InputArgs.hasArg(OBJDUMP_archive_headers);
CallGraphInfo = InputArgs.hasArg(OBJDUMP_call_graph_info);
Demangle = InputArgs.hasArg(OBJDUMP_demangle); Demangle = InputArgs.hasArg(OBJDUMP_demangle);
Disassemble = InputArgs.hasArg(OBJDUMP_disassemble); Disassemble = InputArgs.hasArg(OBJDUMP_disassemble);
DisassembleAll = InputArgs.hasArg(OBJDUMP_disassemble_all); DisassembleAll = InputArgs.hasArg(OBJDUMP_disassemble_all);
SymbolDescription = InputArgs.hasArg(OBJDUMP_symbol_description); SymbolDescription = InputArgs.hasArg(OBJDUMP_symbol_description);
DisassembleSymbols = DisassembleSymbols =
commaSeparatedValues(InputArgs, OBJDUMP_disassemble_symbols_EQ); commaSeparatedValues(InputArgs, OBJDUMP_disassemble_symbols_EQ);
DisassembleZeroes = InputArgs.hasArg(OBJDUMP_disassemble_zeroes); DisassembleZeroes = InputArgs.hasArg(OBJDUMP_disassemble_zeroes);
if (const opt::Arg *A = InputArgs.getLastArg(OBJDUMP_dwarf_EQ)) { if (const opt::Arg *A = InputArgs.getLastArg(OBJDUMP_dwarf_EQ)) {
▲ Show 20 Lines • Show All 71 Lines • ▼ Show 20 Lines for (StringRef V : Values) {
DisassemblerOptions.push_back(V.str()); DisassemblerOptions.push_back(V.str());
} }
} }
if (AsmSyntax) { if (AsmSyntax) {
const char *Argv[] = {"llvm-objdump", AsmSyntax}; const char *Argv[] = {"llvm-objdump", AsmSyntax};
llvm::cl::ParseCommandLineOptions(2, Argv); llvm::cl::ParseCommandLineOptions(2, Argv);
} }
QuietDisasm = false; QuietDisasm = CallGraphInfo;
// objdump defaults to a.out if no filenames specified. // objdump defaults to a.out if no filenames specified.
if (InputFilenames.empty()) if (InputFilenames.empty())
InputFilenames.push_back("a.out"); InputFilenames.push_back("a.out");
} }
int main(int argc, char **argv) { int main(int argc, char **argv) {
using namespace llvm; using namespace llvm;
▲ Show 20 Lines • Show All 76 Lines • ▼ Show 20 Linesint main(int argc, char **argv) {
if (DisassembleAll || PrintSource || PrintLines || if (DisassembleAll || PrintSource || PrintLines ||
!DisassembleSymbols.empty()) !DisassembleSymbols.empty())
Disassemble = true; Disassemble = true;
if (!ArchiveHeaders && !Disassemble && DwarfDumpType == DIDT_Null && if (!ArchiveHeaders && !Disassemble && DwarfDumpType == DIDT_Null &&
!DynamicRelocations && !FileHeaders && !PrivateHeaders && !RawClangAST && !DynamicRelocations && !FileHeaders && !PrivateHeaders && !RawClangAST &&
!Relocations && !SectionHeaders && !SectionContents && !SymbolTable && !Relocations && !SectionHeaders && !SectionContents && !SymbolTable &&
!DynamicSymbolTable && !UnwindInfo && !FaultMapSection && !DynamicSymbolTable && !UnwindInfo && !FaultMapSection &&
!CallGraphInfo &&
!(MachOOpt && !(MachOOpt &&
(Bind || DataInCode || DylibId || DylibsUsed || ExportsTrie || (Bind || DataInCode || DylibId || DylibsUsed || ExportsTrie ||
FirstPrivateHeader || FunctionStarts || IndirectSymbols || InfoPlist || FirstPrivateHeader || FunctionStarts || IndirectSymbols || InfoPlist ||
LazyBind || LinkOptHints || ObjcMetaData || Rebase || Rpaths || LazyBind || LinkOptHints || ObjcMetaData || Rebase || Rpaths ||
UniversalHeaders || WeakBind || !FilterSections.empty()))) { UniversalHeaders || WeakBind || !FilterSections.empty()))) {
T->printHelp(ToolName); T->printHelp(ToolName);
return 2; return 2;
} }
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