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//===-- ObjDumper.cpp - Base dumper class -----------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements ObjDumper.
///
//===----------------------------------------------------------------------===//
#include "ObjDumper.h"
#include "llvm-readobj.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/Support/raw_ostream.h"
#include <map>
namespace llvm {
static inline Error createError(const Twine &Msg) {
return createStringError(object::object_error::parse_failed, Msg);
}
ObjDumper::ObjDumper(ScopedPrinter &Writer, StringRef ObjName) : W(Writer) {
// Dumper reports all non-critical errors as warnings.
// It does not print the same warning more than once.
WarningHandler = [=](const Twine &Msg) {
if (Warnings.insert(Msg.str()).second)
reportWarning(createError(Msg), ObjName);
return Error::success();
};
}
ObjDumper::~ObjDumper() {}
void ObjDumper::reportUniqueWarning(Error Err) const {
reportUniqueWarning(toString(std::move(Err)));
}
void ObjDumper::reportUniqueWarning(const Twine &Msg) const {
cantFail(WarningHandler(Msg),
"WarningHandler should always return ErrorSuccess");
}
static void printAsPrintable(raw_ostream &W, const uint8_t *Start, size_t Len) {
for (size_t i = 0; i < Len; i++)
W << (isPrint(Start[i]) ? static_cast<char>(Start[i]) : '.');
}
static std::vector<object::SectionRef>
getSectionRefsByNameOrIndex(const object::ObjectFile &Obj,
ArrayRef<std::string> Sections) {
std::vector<object::SectionRef> Ret;
std::map<std::string, bool> SecNames;
std::map<unsigned, bool> SecIndices;
unsigned SecIndex;
for (StringRef Section : Sections) {
if (!Section.getAsInteger(0, SecIndex))
SecIndices.emplace(SecIndex, false);
else
SecNames.emplace(std::string(Section), false);
}
SecIndex = Obj.isELF() ? 0 : 1;
for (object::SectionRef SecRef : Obj.sections()) {
StringRef SecName = unwrapOrError(Obj.getFileName(), SecRef.getName());
auto NameIt = SecNames.find(std::string(SecName));
if (NameIt != SecNames.end())
NameIt->second = true;
auto IndexIt = SecIndices.find(SecIndex);
if (IndexIt != SecIndices.end())
IndexIt->second = true;
if (NameIt != SecNames.end() || IndexIt != SecIndices.end())
Ret.push_back(SecRef);
SecIndex++;
}
for (const std::pair<const std::string, bool> &S : SecNames)
if (!S.second)
reportWarning(
createError(formatv("could not find section '{0}'", S.first).str()),
Obj.getFileName());
for (std::pair<unsigned, bool> S : SecIndices)
if (!S.second)
reportWarning(
createError(formatv("could not find section {0}", S.first).str()),
Obj.getFileName());
return Ret;
}
void ObjDumper::printSectionsAsString(const object::ObjectFile &Obj,
ArrayRef<std::string> Sections) {
bool First = true;
for (object::SectionRef Section :
getSectionRefsByNameOrIndex(Obj, Sections)) {
StringRef SectionName = unwrapOrError(Obj.getFileName(), Section.getName());
if (!First)
W.startLine() << '\n';
First = false;
W.startLine() << "String dump of section '" << SectionName << "':\n";
StringRef SectionContent =
unwrapOrError(Obj.getFileName(), Section.getContents());
const uint8_t *SecContent = SectionContent.bytes_begin();
const uint8_t *CurrentWord = SecContent;
const uint8_t *SecEnd = SectionContent.bytes_end();
while (CurrentWord <= SecEnd) {
size_t WordSize = strnlen(reinterpret_cast<const char *>(CurrentWord),
SecEnd - CurrentWord);
if (!WordSize) {
CurrentWord++;
continue;
}
W.startLine() << format("[%6tx] ", CurrentWord - SecContent);
printAsPrintable(W.startLine(), CurrentWord, WordSize);
W.startLine() << '\n';
CurrentWord += WordSize + 1;
}
}
}
void ObjDumper::printSectionsAsHex(const object::ObjectFile &Obj,
ArrayRef<std::string> Sections) {
bool First = true;
for (object::SectionRef Section :
getSectionRefsByNameOrIndex(Obj, Sections)) {
StringRef SectionName = unwrapOrError(Obj.getFileName(), Section.getName());
if (!First)
W.startLine() << '\n';
First = false;
W.startLine() << "Hex dump of section '" << SectionName << "':\n";
StringRef SectionContent =
unwrapOrError(Obj.getFileName(), Section.getContents());
const uint8_t *SecContent = SectionContent.bytes_begin();
const uint8_t *SecEnd = SecContent + SectionContent.size();
for (const uint8_t *SecPtr = SecContent; SecPtr < SecEnd; SecPtr += 16) {
const uint8_t *TmpSecPtr = SecPtr;
uint8_t i;
uint8_t k;
W.startLine() << format_hex(Section.getAddress() + (SecPtr - SecContent),
10);
W.startLine() << ' ';
for (i = 0; TmpSecPtr < SecEnd && i < 4; ++i) {
for (k = 0; TmpSecPtr < SecEnd && k < 4; k++, TmpSecPtr++) {
uint8_t Val = *(reinterpret_cast<const uint8_t *>(TmpSecPtr));
W.startLine() << format_hex_no_prefix(Val, 2);
}
W.startLine() << ' ';
}
// We need to print the correct amount of spaces to match the format.
// We are adding the (4 - i) last rows that are 8 characters each.
// Then, the (4 - i) spaces that are in between the rows.
// Least, if we cut in a middle of a row, we add the remaining characters,
// which is (8 - (k * 2)).
if (i < 4)
W.startLine() << format("%*c", (4 - i) * 8 + (4 - i), ' ');
if (k < 4)
W.startLine() << format("%*c", 8 - k * 2, ' ');
TmpSecPtr = SecPtr;
for (i = 0; TmpSecPtr + i < SecEnd && i < 16; ++i)
W.startLine() << (isPrint(TmpSecPtr[i])
? static_cast<char>(TmpSecPtr[i])
: '.');
W.startLine() << '\n';
}
}
}
} // namespace llvm
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