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Don't fetch pointers from a InMemoryStruct.

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InMemoryStruct is extremely dangerous as it returns data from an internal
buffer when the endiannes doesn't match. This should fix the tests on big
endian hosts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178875 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-04-05 15:15:22 +00:00
parent 332edeb1dc
commit f16c2bb320
7 changed files with 43 additions and 39 deletions
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8
include/llvm/Object/MachO.h
View File

@ -15,6 +15,7 @@
#ifndef LLVM_OBJECT_MACHO_H
#define LLVM_OBJECT_MACHO_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Object/MachOObject.h"
#include "llvm/Object/ObjectFile.h"
@ -47,7 +48,12 @@ public:
// In a MachO file, sections have a segment name. This is used in the .o
// files. They have a single segment, but this field specifies which segment
// a section should be put in in the final object.
error_code getSectionFinalSegmentName(DataRefImpl Sec, StringRef &Res) const;
StringRef getSectionFinalSegmentName(DataRefImpl Sec) const;
// Names are stored as 16 bytes. These returns the raw 16 bytes without
// interpreting them as a C string.
ArrayRef<char> getSectionRawName(DataRefImpl Sec) const;
ArrayRef<char>getSectionRawFinalSegmentName(DataRefImpl Sec) const;
MachOObject *getObject() { return MachOObj.get(); }

27
lib/Object/MachOObjectFile.cpp
View File

@ -481,8 +481,7 @@ static StringRef parseSegmentOrSectionName(const char *P) {
return StringRef(P, 16);
}
error_code MachOObjectFile::getSectionName(DataRefImpl DRI,
StringRef &Result) const {
ArrayRef<char> MachOObjectFile::getSectionRawName(DataRefImpl DRI) const {
if (is64BitLoadCommand(MachOObj.get(), DRI)) {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
unsigned SectionOffset = LCI.Offset + sizeof(macho::Segment64LoadCommand) +
@ -490,7 +489,7 @@ error_code MachOObjectFile::getSectionName(DataRefImpl DRI,
StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section64));
const macho::Section64 *sec =
reinterpret_cast<const macho::Section64*>(Data.data());
Result = parseSegmentOrSectionName(sec->Name);
return ArrayRef<char>(sec->Name, 16);
} else {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
unsigned SectionOffset = LCI.Offset + sizeof(macho::SegmentLoadCommand) +
@ -498,13 +497,19 @@ error_code MachOObjectFile::getSectionName(DataRefImpl DRI,
StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section));
const macho::Section *sec =
reinterpret_cast<const macho::Section*>(Data.data());
Result = parseSegmentOrSectionName(sec->Name);
return ArrayRef<char>(sec->Name, 16);
}
}
error_code MachOObjectFile::getSectionName(DataRefImpl DRI,
StringRef &Result) const {
ArrayRef<char> Raw = getSectionRawName(DRI);
Result = parseSegmentOrSectionName(Raw.data());
return object_error::success;
}
error_code MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec,
StringRef &Res) const {
ArrayRef<char>
MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
if (is64BitLoadCommand(MachOObj.get(), Sec)) {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(Sec.d.a);
unsigned SectionOffset = LCI.Offset + sizeof(macho::Segment64LoadCommand) +
@ -512,7 +517,7 @@ error_code MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec,
StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section64));
const macho::Section64 *sec =
reinterpret_cast<const macho::Section64*>(Data.data());
Res = parseSegmentOrSectionName(sec->SegmentName);
return ArrayRef<char>(sec->SegmentName, 16);
} else {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(Sec.d.a);
unsigned SectionOffset = LCI.Offset + sizeof(macho::SegmentLoadCommand) +
@ -520,9 +525,13 @@ error_code MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec,
StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section));
const macho::Section *sec =
reinterpret_cast<const macho::Section*>(Data.data());
Res = parseSegmentOrSectionName(sec->SegmentName);
return ArrayRef<char>(sec->SegmentName);
}
return object_error::success;
}
StringRef MachOObjectFile::getSectionFinalSegmentName(DataRefImpl DRI) const {
ArrayRef<char> Raw = getSectionRawFinalSegmentName(DRI);
return parseSegmentOrSectionName(Raw.data());
}
error_code MachOObjectFile::getSectionAddress(DataRefImpl DRI,

4
test/tools/llvm-readobj/sections-ext.test
View File

@ -135,8 +135,8 @@ ELF-NEXT: }
MACHO: Sections [
MACHO-NEXT: Section {
MACHO-NEXT: Index: 0
MACHO-NEXT: Name: __text (5F 5F 74 65 78 74 00
MACHO-NEXT: Segment:
MACHO-NEXT: Name: __text (5F 5F 74 65 78 74 00 00 00 00 00 00 00 00 00 00)
MACHO-NEXT: Segment: __TEXT (5F 5F 54 45 58 54 00 00 00 00 00 00 00 00 00 00)
MACHO-NEXT: Address: 0x0
MACHO-NEXT: Size: 0x22
MACHO-NEXT: Offset: 324

8
test/tools/llvm-readobj/sections.test
View File

@ -79,8 +79,8 @@ ELF-NEXT: }
MACHO: Sections [
MACHO-NEXT: Section {
MACHO-NEXT: Index: 0
MACHO-NEXT: Name: __text (
MACHO-NEXT: Segment:
MACHO-NEXT: Name: __text (5F 5F 74 65 78 74 00 00 00 00 00 00 00 00 00 00)
MACHO-NEXT: Segment: __TEXT (5F 5F 54 45 58 54 00 00 00 00 00 00 00 00 00 00)
MACHO-NEXT: Address: 0x0
MACHO-NEXT: Size: 0x22
MACHO-NEXT: Offset: 324
@ -97,8 +97,8 @@ MACHO-NEXT: Reserved2: 0x0
MACHO-NEXT: }
MACHO-NEXT: Section {
MACHO-NEXT: Index: 1
MACHO-NEXT: Name: __cstring (
MACHO-NEXT: Segment:
MACHO-NEXT: Name: __cstring (5F 5F 63 73 74 72 69 6E 67 00 00 00 00 00 00 00)
MACHO-NEXT: Segment: __TEXT (5F 5F 54 45 58 54 00 00 00 00 00 00 00 00 00 00)
MACHO-NEXT: Address: 0x22
MACHO-NEXT: Size: 0xD
MACHO-NEXT: Offset: 358

5
tools/llvm-objdump/MachODump.cpp
View File

@ -337,10 +337,9 @@ void llvm::DisassembleInputMachO(StringRef Filename) {
SectName != "__text")
continue; // Skip non-text sections
StringRef SegmentName;
DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
if (MachOOF->getSectionFinalSegmentName(DR, SegmentName) ||
SegmentName != "__TEXT")
StringRef SegmentName = MachOOF->getSectionFinalSegmentName(DR);
if (SegmentName != "__TEXT")
continue;
// Insert the functions from the function starts segment into our map.

7
tools/llvm-objdump/llvm-objdump.cpp
View File

@ -257,8 +257,7 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
StringRef SegmentName = "";
if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
DataRefImpl DR = i->getRawDataRefImpl();
if (error(MachO->getSectionFinalSegmentName(DR, SegmentName)))
break;
SegmentName = MachO->getSectionFinalSegmentName(DR);
}
StringRef name;
if (error(i->getName(name))) break;
@ -593,10 +592,8 @@ static void PrintSymbolTable(const ObjectFile *o) {
outs() << "*UND*";
else {
if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(o)) {
StringRef SegmentName;
DataRefImpl DR = Section->getRawDataRefImpl();
if (error(MachO->getSectionFinalSegmentName(DR, SegmentName)))
SegmentName = "";
StringRef SegmentName = MachO->getSectionFinalSegmentName(DR);
outs() << SegmentName << ",";
}
StringRef SectionName;

23
tools/llvm-readobj/MachODumper.cpp
View File

@ -157,14 +157,6 @@ namespace {
};
}
static StringRef parseSegmentOrSectionName(ArrayRef<char> P) {
if (P[15] == 0)
// Null terminated.
return StringRef(P.data());
// Not null terminated, so this is a 16 char string.
return StringRef(P.data(), 16);
}
static bool is64BitLoadCommand(const MachOObject *MachOObj, DataRefImpl DRI) {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
if (LCI.Command.Type == macho::LCT_Segment64)
@ -181,8 +173,6 @@ static void getSection(const MachOObject *MachOObj,
InMemoryStruct<macho::Section64> Sect;
MachOObj->ReadSection64(LCI, DRI.d.b, Sect);
Section.Name = ArrayRef<char>(Sect->Name);
Section.SegmentName = ArrayRef<char>(Sect->SegmentName);
Section.Address = Sect->Address;
Section.Size = Sect->Size;
Section.Offset = Sect->Offset;
@ -196,8 +186,6 @@ static void getSection(const MachOObject *MachOObj,
InMemoryStruct<macho::Section> Sect;
MachOObj->ReadSection(LCI, DRI.d.b, Sect);
Section.Name = Sect->Name;
Section.SegmentName = Sect->SegmentName;
Section.Address = Sect->Address;
Section.Size = Sect->Size;
Section.Offset = Sect->Offset;
@ -270,15 +258,20 @@ void MachODumper::printSections() {
MachOSection Section;
getSection(MachO, SecI->getRawDataRefImpl(), Section);
DataRefImpl DR = SecI->getRawDataRefImpl();
StringRef Name;
if (error(SecI->getName(Name)))
Name = "";
ArrayRef<char> RawName = Obj->getSectionRawName(DR);
StringRef SegmentName = Obj->getSectionFinalSegmentName(DR);
ArrayRef<char> RawSegmentName = Obj->getSectionRawFinalSegmentName(DR);
DictScope SectionD(W, "Section");
W.printNumber("Index", SectionIndex);
W.printBinary("Name", Name, Section.Name);
W.printBinary("Segment", parseSegmentOrSectionName(Section.SegmentName),
Section.SegmentName);
W.printBinary("Name", Name, RawName);
W.printBinary("Segment", SegmentName, RawSegmentName);
W.printHex ("Address", Section.Address);
W.printHex ("Size", Section.Size);
W.printNumber("Offset", Section.Offset);