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[FaultMaps] Add a parser for the __llvm__faultmaps section.

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Summary:
The parser is exercised by llvm-objdump using -print-fault-maps.  As is
probably obvious, the code itself was "heavily inspired" by
http://reviews.llvm.org/D10434.

Reviewers: reames, atrick, JosephTremoulet

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10491

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240304 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjoy Das
2015-06-22 18:03:02 +00:00
parent 5a94e2a9e8
commit e0ef46e5e7
5 changed files with 286 additions and 1 deletions
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53
tools/llvm-objdump/llvm-objdump.cpp
View File

@ -17,9 +17,11 @@
//===----------------------------------------------------------------------===//
#include "llvm-objdump.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/CodeGen/FaultMaps.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler.h"
@ -153,6 +155,9 @@ cl::opt<bool>
llvm::PrintImmHex("print-imm-hex",
cl::desc("Use hex format for immediate values"));
cl::opt<bool> PrintFaultMaps("fault-map-section",
cl::desc("Display contents of faultmap section"));
static StringRef ToolName;
static int ReturnValue = EXIT_SUCCESS;
@ -1226,6 +1231,49 @@ void llvm::printWeakBindTable(const ObjectFile *o) {
}
}
static void printFaultMaps(const ObjectFile *Obj) {
const char *FaultMapSectionName = nullptr;
if (isa<ELFObjectFileBase>(Obj)) {
FaultMapSectionName = ".llvm_faultmaps";
} else if (isa<MachOObjectFile>(Obj)) {
FaultMapSectionName = "__llvm_faultmaps";
} else {
errs() << "This operation is only currently supported "
"for ELF and Mach-O executable files.\n";
return;
}
Optional<object::SectionRef> FaultMapSection;
for (auto Sec : Obj->sections()) {
StringRef Name;
Sec.getName(Name);
if (Name == FaultMapSectionName) {
FaultMapSection = Sec;
break;
}
}
outs() << "FaultMap table:\n";
if (!FaultMapSection.hasValue()) {
outs() << "<not found>\n";
return;
}
StringRef FaultMapContents;
if (error(FaultMapSection.getValue().getContents(FaultMapContents))) {
errs() << "Could not read the " << FaultMapContents << " section!\n";
return;
}
FaultMapParser FMP(FaultMapContents.bytes_begin(),
FaultMapContents.bytes_end());
outs() << FMP;
}
static void printPrivateFileHeader(const ObjectFile *o) {
if (o->isELF()) {
printELFFileHeader(o);
@ -1265,6 +1313,8 @@ static void DumpObject(const ObjectFile *o) {
printLazyBindTable(o);
if (WeakBind)
printWeakBindTable(o);
if (PrintFaultMaps)
printFaultMaps(o);
}
/// @brief Dump each object file in \a a;
@ -1362,7 +1412,8 @@ int main(int argc, char **argv) {
&& !(DylibsUsed && MachOOpt)
&& !(DylibId && MachOOpt)
&& !(ObjcMetaData && MachOOpt)
&& !(DumpSections.size() != 0 && MachOOpt)) {
&& !(DumpSections.size() != 0 && MachOOpt)
&& !PrintFaultMaps) {
cl::PrintHelpMessage();
return 2;
}