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//===-- ObjDumper.cpp - Base dumper class -----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements ObjDumper.
///
//===----------------------------------------------------------------------===//
#include "ObjDumper.h"
#include "Error.h"
#include "llvm-readobj.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
ObjDumper::ObjDumper(ScopedPrinter &Writer) : W(Writer) {}
ObjDumper::~ObjDumper() {
}
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 Expected<object::SectionRef>
getSecNameOrIndexAsSecRef(const object::ObjectFile *Obj, StringRef SecName) {
char *StrPtr;
long SectionIndex = strtol(SecName.data(), &StrPtr, 10);
object::SectionRef Section;
long SecIndex;
if (Obj->isELF())
SecIndex = 0;
else
SecIndex = 1;
for (object::SectionRef SecRef : Obj->sections()) {
if (*StrPtr) {
StringRef SectionName;
if (std::error_code E = SecRef.getName(SectionName))
return errorCodeToError(E);
if (SectionName == SecName)
return SecRef;
} else if (SecIndex == SectionIndex)
return SecRef;
SecIndex++;
}
return make_error<StringError>("invalid section reference",
object::object_error::parse_failed);
}
void ObjDumper::printSectionAsString(const object::ObjectFile *Obj,
StringRef SecName) {
Expected<object::SectionRef> SectionRefOrError =
getSecNameOrIndexAsSecRef(Obj, SecName);
if (!SectionRefOrError)
error(std::move(SectionRefOrError));
object::SectionRef Section = *SectionRefOrError;
StringRef SectionName;
if (std::error_code E = Section.getName(SectionName))
error(E);
W.startLine() << "String dump of section '" << SectionName << "':\n";
StringRef SectionContent;
Section.getContents(SectionContent);
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::printSectionAsHex(const object::ObjectFile *Obj,
StringRef SecName) {
Expected<object::SectionRef> SectionRefOrError =
getSecNameOrIndexAsSecRef(Obj, SecName);
if (!SectionRefOrError)
error(std::move(SectionRefOrError));
object::SectionRef Section = *SectionRefOrError;
StringRef SectionName;
if (std::error_code E = Section.getName(SectionName))
error(E);
W.startLine() << "Hex dump of section '" << SectionName << "':\n";
StringRef SectionContent;
Section.getContents(SectionContent);
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(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) + (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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