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-rw-r--r--tools/llvm-objdump/MachODump.cpp334
1 files changed, 43 insertions, 291 deletions
diff --git a/tools/llvm-objdump/MachODump.cpp b/tools/llvm-objdump/MachODump.cpp
index c7e5cc1ede..03a383eb12 100644
--- a/tools/llvm-objdump/MachODump.cpp
+++ b/tools/llvm-objdump/MachODump.cpp
@@ -12,9 +12,9 @@
//===----------------------------------------------------------------------===//
#include "llvm-objdump.h"
-#include "MCFunction.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/MC/MCAsmInfo.h"
@@ -44,10 +44,6 @@ using namespace llvm;
using namespace object;
static cl::opt<bool>
- CFG("cfg", cl::desc("Create a CFG for every symbol in the object file and"
- " write it to a graphviz file (MachO-only)"));
-
-static cl::opt<bool>
UseDbg("g", cl::desc("Print line information from debug info if available"));
static cl::opt<std::string>
@@ -91,99 +87,6 @@ struct SymbolSorter {
}
};
-// Print additional information about an address, if available.
-static void DumpAddress(uint64_t Address, ArrayRef<SectionRef> Sections,
- const MachOObjectFile *MachOObj, raw_ostream &OS) {
- for (unsigned i = 0; i != Sections.size(); ++i) {
- uint64_t SectAddr = 0, SectSize = 0;
- Sections[i].getAddress(SectAddr);
- Sections[i].getSize(SectSize);
- uint64_t addr = SectAddr;
- if (SectAddr <= Address &&
- SectAddr + SectSize > Address) {
- StringRef bytes, name;
- Sections[i].getContents(bytes);
- Sections[i].getName(name);
- // Print constant strings.
- if (!name.compare("__cstring"))
- OS << '"' << bytes.substr(addr, bytes.find('\0', addr)) << '"';
- // Print constant CFStrings.
- if (!name.compare("__cfstring"))
- OS << "@\"" << bytes.substr(addr, bytes.find('\0', addr)) << '"';
- }
- }
-}
-
-typedef std::map<uint64_t, MCFunction*> FunctionMapTy;
-typedef SmallVector<MCFunction, 16> FunctionListTy;
-static void createMCFunctionAndSaveCalls(StringRef Name,
- const MCDisassembler *DisAsm,
- MemoryObject &Object, uint64_t Start,
- uint64_t End,
- MCInstrAnalysis *InstrAnalysis,
- uint64_t Address,
- raw_ostream &DebugOut,
- FunctionMapTy &FunctionMap,
- FunctionListTy &Functions) {
- SmallVector<uint64_t, 16> Calls;
- MCFunction f =
- MCFunction::createFunctionFromMC(Name, DisAsm, Object, Start, End,
- InstrAnalysis, DebugOut, Calls);
- Functions.push_back(f);
- FunctionMap[Address] = &Functions.back();
-
- // Add the gathered callees to the map.
- for (unsigned i = 0, e = Calls.size(); i != e; ++i)
- FunctionMap.insert(std::make_pair(Calls[i], (MCFunction*)0));
-}
-
-// Write a graphviz file for the CFG inside an MCFunction.
-static void emitDOTFile(const char *FileName, const MCFunction &f,
- MCInstPrinter *IP) {
- // Start a new dot file.
- std::string Error;
- raw_fd_ostream Out(FileName, Error);
- if (!Error.empty()) {
- errs() << "llvm-objdump: warning: " << Error << '\n';
- return;
- }
-
- Out << "digraph " << f.getName() << " {\n";
- Out << "graph [ rankdir = \"LR\" ];\n";
- for (MCFunction::iterator i = f.begin(), e = f.end(); i != e; ++i) {
- bool hasPreds = false;
- // Only print blocks that have predecessors.
- // FIXME: Slow.
- for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
- ++pi)
- if (pi->second.contains(i->first)) {
- hasPreds = true;
- break;
- }
-
- if (!hasPreds && i != f.begin())
- continue;
-
- Out << '"' << i->first << "\" [ label=\"<a>";
- // Print instructions.
- for (unsigned ii = 0, ie = i->second.getInsts().size(); ii != ie;
- ++ii) {
- // Escape special chars and print the instruction in mnemonic form.
- std::string Str;
- raw_string_ostream OS(Str);
- IP->printInst(&i->second.getInsts()[ii].Inst, OS, "");
- Out << DOT::EscapeString(OS.str()) << '|';
- }
- Out << "<o>\" shape=\"record\" ];\n";
-
- // Add edges.
- for (MCBasicBlock::succ_iterator si = i->second.succ_begin(),
- se = i->second.succ_end(); si != se; ++si)
- Out << i->first << ":o -> " << *si <<":a\n";
- }
- Out << "}\n";
-}
-
static void
getSectionsAndSymbols(const macho::Header Header,
MachOObjectFile *MachOObj,
@@ -272,6 +175,12 @@ static void DisassembleInputMachO2(StringRef Filename,
macho::Header Header = MachOOF->getHeader();
+ // FIXME: FoundFns isn't used anymore. Using symbols/LC_FUNCTION_STARTS to
+ // determine function locations will eventually go in MCObjectDisassembler.
+ // FIXME: Using the -cfg command line option, this code used to be able to
+ // annotate relocations with the referenced symbol's name, and if this was
+ // inside a __[cf]string section, the data it points to. This is now replaced
+ // by the upcoming MCSymbolizer, which needs the appropriate setup done above.
std::vector<SectionRef> Sections;
std::vector<SymbolRef> Symbols;
SmallVector<uint64_t, 8> FoundFns;
@@ -308,31 +217,24 @@ static void DisassembleInputMachO2(StringRef Filename,
diContext.reset(DIContext::getDWARFContext(DbgObj));
}
- FunctionMapTy FunctionMap;
- FunctionListTy Functions;
-
for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
+
+ bool SectIsText = false;
+ Sections[SectIdx].isText(SectIsText);
+ if (SectIsText == false)
+ continue;
+
StringRef SectName;
if (Sections[SectIdx].getName(SectName) ||
SectName != "__text")
continue; // Skip non-text sections
DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
+
StringRef SegmentName = MachOOF->getSectionFinalSegmentName(DR);
if (SegmentName != "__TEXT")
continue;
- // Insert the functions from the function starts segment into our map.
- uint64_t VMAddr;
- Sections[SectIdx].getAddress(VMAddr);
- for (unsigned i = 0, e = FoundFns.size(); i != e; ++i) {
- StringRef SectBegin;
- Sections[SectIdx].getContents(SectBegin);
- uint64_t Offset = (uint64_t)SectBegin.data();
- FunctionMap.insert(std::make_pair(VMAddr + FoundFns[i]-Offset,
- (MCFunction*)0));
- }
-
StringRef Bytes;
Sections[SectIdx].getContents(Bytes);
StringRefMemoryObject memoryObject(Bytes);
@@ -403,52 +305,39 @@ static void DisassembleInputMachO2(StringRef Filename,
symbolTableWorked = true;
- if (!CFG) {
- // Normal disassembly, print addresses, bytes and mnemonic form.
- StringRef SymName;
- Symbols[SymIdx].getName(SymName);
-
- outs() << SymName << ":\n";
- DILineInfo lastLine;
- for (uint64_t Index = Start; Index < End; Index += Size) {
- MCInst Inst;
-
- if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
- DebugOut, nulls())) {
- uint64_t SectAddress = 0;
- Sections[SectIdx].getAddress(SectAddress);
- outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
-
- DumpBytes(StringRef(Bytes.data() + Index, Size));
- IP->printInst(&Inst, outs(), "");
-
- // Print debug info.
- if (diContext) {
- DILineInfo dli =
- diContext->getLineInfoForAddress(SectAddress + Index);
- // Print valid line info if it changed.
- if (dli != lastLine && dli.getLine() != 0)
- outs() << "\t## " << dli.getFileName() << ':'
- << dli.getLine() << ':' << dli.getColumn();
- lastLine = dli;
- }
- outs() << "\n";
- } else {
- errs() << "llvm-objdump: warning: invalid instruction encoding\n";
- if (Size == 0)
- Size = 1; // skip illegible bytes
+ outs() << SymName << ":\n";
+ DILineInfo lastLine;
+ for (uint64_t Index = Start; Index < End; Index += Size) {
+ MCInst Inst;
+
+ if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
+ DebugOut, nulls())) {
+ uint64_t SectAddress = 0;
+ Sections[SectIdx].getAddress(SectAddress);
+ outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
+
+ DumpBytes(StringRef(Bytes.data() + Index, Size));
+ IP->printInst(&Inst, outs(), "");
+
+ // Print debug info.
+ if (diContext) {
+ DILineInfo dli =
+ diContext->getLineInfoForAddress(SectAddress + Index);
+ // Print valid line info if it changed.
+ if (dli != lastLine && dli.getLine() != 0)
+ outs() << "\t## " << dli.getFileName() << ':'
+ << dli.getLine() << ':' << dli.getColumn();
+ lastLine = dli;
}
+ outs() << "\n";
+ } else {
+ errs() << "llvm-objdump: warning: invalid instruction encoding\n";
+ if (Size == 0)
+ Size = 1; // skip illegible bytes
}
- } else {
- // Create CFG and use it for disassembly.
- StringRef SymName;
- Symbols[SymIdx].getName(SymName);
- createMCFunctionAndSaveCalls(
- SymName, DisAsm.get(), memoryObject, Start, End,
- InstrAnalysis.get(), Start, DebugOut, FunctionMap, Functions);
}
}
- if (!CFG && !symbolTableWorked) {
+ if (!symbolTableWorked) {
// Reading the symbol table didn't work, disassemble the whole section.
uint64_t SectAddress;
Sections[SectIdx].getAddress(SectAddress);
@@ -471,142 +360,5 @@ static void DisassembleInputMachO2(StringRef Filename,
}
}
}
-
- if (CFG) {
- if (!symbolTableWorked) {
- // Reading the symbol table didn't work, create a big __TEXT symbol.
- uint64_t SectSize = 0, SectAddress = 0;
- Sections[SectIdx].getSize(SectSize);
- Sections[SectIdx].getAddress(SectAddress);
- createMCFunctionAndSaveCalls("__TEXT", DisAsm.get(), memoryObject,
- 0, SectSize,
- InstrAnalysis.get(),
- SectAddress, DebugOut,
- FunctionMap, Functions);
- }
- for (std::map<uint64_t, MCFunction*>::iterator mi = FunctionMap.begin(),
- me = FunctionMap.end(); mi != me; ++mi)
- if (mi->second == 0) {
- // Create functions for the remaining callees we have gathered,
- // but we didn't find a name for them.
- uint64_t SectSize = 0;
- Sections[SectIdx].getSize(SectSize);
-
- SmallVector<uint64_t, 16> Calls;
- MCFunction f =
- MCFunction::createFunctionFromMC("unknown", DisAsm.get(),
- memoryObject, mi->first,
- SectSize,
- InstrAnalysis.get(), DebugOut,
- Calls);
- Functions.push_back(f);
- mi->second = &Functions.back();
- for (unsigned i = 0, e = Calls.size(); i != e; ++i) {
- std::pair<uint64_t, MCFunction*> p(Calls[i], (MCFunction*)0);
- if (FunctionMap.insert(p).second)
- mi = FunctionMap.begin();
- }
- }
-
- DenseSet<uint64_t> PrintedBlocks;
- for (unsigned ffi = 0, ffe = Functions.size(); ffi != ffe; ++ffi) {
- MCFunction &f = Functions[ffi];
- for (MCFunction::iterator fi = f.begin(), fe = f.end(); fi != fe; ++fi){
- if (!PrintedBlocks.insert(fi->first).second)
- continue; // We already printed this block.
-
- // We assume a block has predecessors when it's the first block after
- // a symbol.
- bool hasPreds = FunctionMap.find(fi->first) != FunctionMap.end();
-
- // See if this block has predecessors.
- // FIXME: Slow.
- for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
- ++pi)
- if (pi->second.contains(fi->first)) {
- hasPreds = true;
- break;
- }
-
- uint64_t SectSize = 0, SectAddress;
- Sections[SectIdx].getSize(SectSize);
- Sections[SectIdx].getAddress(SectAddress);
-
- // No predecessors, this is a data block. Print as .byte directives.
- if (!hasPreds) {
- uint64_t End = llvm::next(fi) == fe ? SectSize :
- llvm::next(fi)->first;
- outs() << "# " << End-fi->first << " bytes of data:\n";
- for (unsigned pos = fi->first; pos != End; ++pos) {
- outs() << format("%8x:\t", SectAddress + pos);
- DumpBytes(StringRef(Bytes.data() + pos, 1));
- outs() << format("\t.byte 0x%02x\n", (uint8_t)Bytes[pos]);
- }
- continue;
- }
-
- if (fi->second.contains(fi->first)) // Print a header for simple loops
- outs() << "# Loop begin:\n";
-
- DILineInfo lastLine;
- // Walk over the instructions and print them.
- for (unsigned ii = 0, ie = fi->second.getInsts().size(); ii != ie;
- ++ii) {
- const MCDecodedInst &Inst = fi->second.getInsts()[ii];
-
- // If there's a symbol at this address, print its name.
- if (FunctionMap.find(SectAddress + Inst.Address) !=
- FunctionMap.end())
- outs() << FunctionMap[SectAddress + Inst.Address]-> getName()
- << ":\n";
-
- outs() << format("%8" PRIx64 ":\t", SectAddress + Inst.Address);
- DumpBytes(StringRef(Bytes.data() + Inst.Address, Inst.Size));
-
- if (fi->second.contains(fi->first)) // Indent simple loops.
- outs() << '\t';
-
- IP->printInst(&Inst.Inst, outs(), "");
-
- // Look for relocations inside this instructions, if there is one
- // print its target and additional information if available.
- for (unsigned j = 0; j != Relocs.size(); ++j)
- if (Relocs[j].first >= SectAddress + Inst.Address &&
- Relocs[j].first < SectAddress + Inst.Address + Inst.Size) {
- StringRef SymName;
- uint64_t Addr;
- Relocs[j].second.getAddress(Addr);
- Relocs[j].second.getName(SymName);
-
- outs() << "\t# " << SymName << ' ';
- DumpAddress(Addr, Sections, MachOOF, outs());
- }
-
- // If this instructions contains an address, see if we can evaluate
- // it and print additional information.
- uint64_t targ = InstrAnalysis->evaluateBranch(Inst.Inst,
- Inst.Address,
- Inst.Size);
- if (targ != -1ULL)
- DumpAddress(targ, Sections, MachOOF, outs());
-
- // Print debug info.
- if (diContext) {
- DILineInfo dli =
- diContext->getLineInfoForAddress(SectAddress + Inst.Address);
- // Print valid line info if it changed.
- if (dli != lastLine && dli.getLine() != 0)
- outs() << "\t## " << dli.getFileName() << ':'
- << dli.getLine() << ':' << dli.getColumn();
- lastLine = dli;
- }
-
- outs() << '\n';
- }
- }
-
- emitDOTFile((f.getName().str() + ".dot").c_str(), f, IP.get());
- }
- }
}
}
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