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a6534d0295
Produce the first specific error message for a malformed Mach-O file describing the problem instead of the generic message for object_error::parse_failed of "Invalid data was encountered while parsing the file”. Many more good error messages will follow after this first one. This is built on Lang Hames’ great work of adding the ’Error' class for structured error handling and threading Error through MachOObjectFile construction. And making createMachOObjectFile return Expected<...> . So to to get the error to the llvm-obdump tool, I changed the stack of these methods to also return Expected<...> : object::ObjectFile::createObjectFile() object::SymbolicFile::createSymbolicFile() object::createBinary() Then finally in ParseInputMachO() in MachODump.cpp the error can be reported and the specific error message can be printed in llvm-objdump and can be seen in the existing test case for the existing malformed binary but with the updated error message. Converting these interfaces to Expected<> from ErrorOr<> does involve touching a number of places. To contain the changes for now use of errorToErrorCode() and errorOrToExpected() are used where the callers are yet to be converted. Also there some were bugs in the existing code that did not deal with the old ErrorOr<> return values. So now with Expected<> since they must be checked and the error handled, I added a TODO and a comment: “// TODO: Actually report errors helpfully” and a call something like consumeError(ObjOrErr.takeError()) so the buggy code will not crash since needed to deal with the Error. Note there is one fix also needed to lld/COFF/InputFiles.cpp that goes along with this that I will commit right after this. So expect lld not to built after this commit and before the next one. llvm-svn: 265606
95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
//===- TestingSupport.cpp - Convert objects files into test files --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/raw_ostream.h"
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#include <functional>
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#include <system_error>
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using namespace llvm;
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using namespace object;
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int convertForTestingMain(int argc, const char *argv[]) {
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::opt<std::string> InputSourceFile(cl::Positional, cl::Required,
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cl::desc("<Source file>"));
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cl::opt<std::string> OutputFilename(
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"o", cl::Required,
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cl::desc(
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"File with the profile data obtained after an instrumented run"));
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cl::ParseCommandLineOptions(argc, argv, "LLVM code coverage tool\n");
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auto ObjErr = llvm::object::ObjectFile::createObjectFile(InputSourceFile);
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if (!ObjErr) {
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std::string Buf;
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raw_string_ostream OS(Buf);
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logAllUnhandledErrors(ObjErr.takeError(), OS, "");
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OS.flush();
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errs() << "error: " << Buf;
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return 1;
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}
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ObjectFile *OF = ObjErr.get().getBinary();
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auto BytesInAddress = OF->getBytesInAddress();
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if (BytesInAddress != 8) {
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errs() << "error: 64 bit binary expected\n";
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return 1;
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}
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// Look for the sections that we are interested in.
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int FoundSectionCount = 0;
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SectionRef ProfileNames, CoverageMapping;
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for (const auto &Section : OF->sections()) {
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StringRef Name;
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if (Section.getName(Name))
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return 1;
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if (Name == "__llvm_prf_names") {
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ProfileNames = Section;
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} else if (Name == "__llvm_covmap") {
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CoverageMapping = Section;
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} else
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continue;
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++FoundSectionCount;
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}
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if (FoundSectionCount != 2)
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return 1;
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// Get the contents of the given sections.
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uint64_t ProfileNamesAddress = ProfileNames.getAddress();
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StringRef CoverageMappingData;
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StringRef ProfileNamesData;
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if (CoverageMapping.getContents(CoverageMappingData) ||
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ProfileNames.getContents(ProfileNamesData))
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return 1;
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int FD;
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if (auto Err =
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sys::fs::openFileForWrite(OutputFilename, FD, sys::fs::F_None)) {
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errs() << "error: " << Err.message() << "\n";
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return 1;
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}
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raw_fd_ostream OS(FD, true);
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OS << "llvmcovmtestdata";
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encodeULEB128(ProfileNamesData.size(), OS);
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encodeULEB128(ProfileNamesAddress, OS);
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OS << ProfileNamesData << CoverageMappingData;
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return 0;
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}
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