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-rw-r--r--lib/Object/MachOObjectFile.cpp115
1 files changed, 78 insertions, 37 deletions
diff --git a/lib/Object/MachOObjectFile.cpp b/lib/Object/MachOObjectFile.cpp
index d229671954..0ad8893400 100644
--- a/lib/Object/MachOObjectFile.cpp
+++ b/lib/Object/MachOObjectFile.cpp
@@ -12,12 +12,11 @@
//
//===----------------------------------------------------------------------===//
-#include "llvm/ADT/Triple.h"
#include "llvm/Object/MachO.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/Object/MachOFormat.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryBuffer.h"
-
#include <cctype>
#include <cstring>
#include <limits>
@@ -50,7 +49,15 @@ ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
MachOObject *MachOObj = MachOObject::LoadFromBuffer(Buffer, &Err);
if (!MachOObj)
return NULL;
- return new MachOObjectFile(Buffer, MachOObj, ec);
+ // MachOObject takes ownership of the Buffer we passed to it, and
+ // MachOObjectFile does, too, so we need to make sure they don't get the
+ // same object. A MemoryBuffer is cheap (it's just a reference to memory,
+ // not a copy of the memory itself), so just make a new copy here for
+ // the MachOObjectFile.
+ MemoryBuffer *NewBuffer =
+ MemoryBuffer::getMemBuffer(Buffer->getBuffer(),
+ Buffer->getBufferIdentifier(), false);
+ return new MachOObjectFile(NewBuffer, MachOObj, ec);
}
/*===-- Symbols -----------------------------------------------------------===*/
@@ -363,6 +370,10 @@ error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
return object_error::success;
}
+error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
+ uint64_t &Val) const {
+ report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
+}
symbol_iterator MachOObjectFile::begin_symbols() const {
// DRI.d.a = segment number; DRI.d.b = symbol index.
@@ -436,9 +447,7 @@ error_code MachOObjectFile::getSectionNext(DataRefImpl DRI,
void
MachOObjectFile::getSection(DataRefImpl DRI,
InMemoryStruct<macho::Section> &Res) const {
- InMemoryStruct<macho::SegmentLoadCommand> SLC;
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
- MachOObj->ReadSegmentLoadCommand(LCI, SLC);
MachOObj->ReadSection(LCI, DRI.d.b, Res);
}
@@ -452,9 +461,7 @@ std::size_t MachOObjectFile::getSectionIndex(DataRefImpl Sec) const {
void
MachOObjectFile::getSection64(DataRefImpl DRI,
InMemoryStruct<macho::Section64> &Res) const {
- InMemoryStruct<macho::Segment64LoadCommand> SLC;
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
- MachOObj->ReadSegment64LoadCommand(LCI, SLC);
MachOObj->ReadSection64(LCI, DRI.d.b, Res);
}
@@ -466,38 +473,61 @@ static bool is64BitLoadCommand(const MachOObject *MachOObj, DataRefImpl DRI) {
return false;
}
+static StringRef parseSegmentOrSectionName(const char *P) {
+ if (P[15] == 0)
+ // Null terminated.
+ return P;
+ // Not null terminated, so this is a 16 char string.
+ return StringRef(P, 16);
+}
+
error_code MachOObjectFile::getSectionName(DataRefImpl DRI,
StringRef &Result) const {
- // FIXME: thread safety.
- static char result[34];
- if (is64BitLoadCommand(MachOObj, DRI)) {
- InMemoryStruct<macho::Segment64LoadCommand> SLC;
+ if (is64BitLoadCommand(MachOObj.get(), DRI)) {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
- MachOObj->ReadSegment64LoadCommand(LCI, SLC);
- InMemoryStruct<macho::Section64> Sect;
- MachOObj->ReadSection64(LCI, DRI.d.b, Sect);
-
- strcpy(result, Sect->SegmentName);
- strcat(result, ",");
- strcat(result, Sect->Name);
+ unsigned SectionOffset = LCI.Offset + sizeof(macho::Segment64LoadCommand) +
+ DRI.d.b * sizeof(macho::Section64);
+ StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section64));
+ const macho::Section64 *sec =
+ reinterpret_cast<const macho::Section64*>(Data.data());
+ Result = parseSegmentOrSectionName(sec->Name);
} else {
- InMemoryStruct<macho::SegmentLoadCommand> SLC;
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
- MachOObj->ReadSegmentLoadCommand(LCI, SLC);
- InMemoryStruct<macho::Section> Sect;
- MachOObj->ReadSection(LCI, DRI.d.b, Sect);
+ unsigned SectionOffset = LCI.Offset + sizeof(macho::SegmentLoadCommand) +
+ DRI.d.b * sizeof(macho::Section);
+ StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section));
+ const macho::Section *sec =
+ reinterpret_cast<const macho::Section*>(Data.data());
+ Result = parseSegmentOrSectionName(sec->Name);
+ }
+ return object_error::success;
+}
- strcpy(result, Sect->SegmentName);
- strcat(result, ",");
- strcat(result, Sect->Name);
+error_code MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec,
+ StringRef &Res) const {
+ if (is64BitLoadCommand(MachOObj.get(), Sec)) {
+ LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(Sec.d.a);
+ unsigned SectionOffset = LCI.Offset + sizeof(macho::Segment64LoadCommand) +
+ Sec.d.b * sizeof(macho::Section64);
+ StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section64));
+ const macho::Section64 *sec =
+ reinterpret_cast<const macho::Section64*>(Data.data());
+ Res = parseSegmentOrSectionName(sec->SegmentName);
+ } else {
+ LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(Sec.d.a);
+ unsigned SectionOffset = LCI.Offset + sizeof(macho::SegmentLoadCommand) +
+ Sec.d.b * sizeof(macho::Section);
+ StringRef Data = MachOObj->getData(SectionOffset, sizeof(macho::Section));
+ const macho::Section *sec =
+ reinterpret_cast<const macho::Section*>(Data.data());
+ Res = parseSegmentOrSectionName(sec->SegmentName);
}
- Result = StringRef(result);
return object_error::success;
}
error_code MachOObjectFile::getSectionAddress(DataRefImpl DRI,
uint64_t &Result) const {
- if (is64BitLoadCommand(MachOObj, DRI)) {
+ if (is64BitLoadCommand(MachOObj.get(), DRI)) {
InMemoryStruct<macho::Section64> Sect;
getSection64(DRI, Sect);
Result = Sect->Address;
@@ -511,7 +541,7 @@ error_code MachOObjectFile::getSectionAddress(DataRefImpl DRI,
error_code MachOObjectFile::getSectionSize(DataRefImpl DRI,
uint64_t &Result) const {
- if (is64BitLoadCommand(MachOObj, DRI)) {
+ if (is64BitLoadCommand(MachOObj.get(), DRI)) {
InMemoryStruct<macho::Section64> Sect;
getSection64(DRI, Sect);
Result = Sect->Size;
@@ -525,7 +555,7 @@ error_code MachOObjectFile::getSectionSize(DataRefImpl DRI,
error_code MachOObjectFile::getSectionContents(DataRefImpl DRI,
StringRef &Result) const {
- if (is64BitLoadCommand(MachOObj, DRI)) {
+ if (is64BitLoadCommand(MachOObj.get(), DRI)) {
InMemoryStruct<macho::Section64> Sect;
getSection64(DRI, Sect);
Result = MachOObj->getData(Sect->Offset, Sect->Size);
@@ -539,7 +569,7 @@ error_code MachOObjectFile::getSectionContents(DataRefImpl DRI,
error_code MachOObjectFile::getSectionAlignment(DataRefImpl DRI,
uint64_t &Result) const {
- if (is64BitLoadCommand(MachOObj, DRI)) {
+ if (is64BitLoadCommand(MachOObj.get(), DRI)) {
InMemoryStruct<macho::Section64> Sect;
getSection64(DRI, Sect);
Result = uint64_t(1) << Sect->Align;
@@ -553,14 +583,14 @@ error_code MachOObjectFile::getSectionAlignment(DataRefImpl DRI,
error_code MachOObjectFile::isSectionText(DataRefImpl DRI,
bool &Result) const {
- if (is64BitLoadCommand(MachOObj, DRI)) {
+ if (is64BitLoadCommand(MachOObj.get(), DRI)) {
InMemoryStruct<macho::Section64> Sect;
getSection64(DRI, Sect);
- Result = !strcmp(Sect->Name, "__text");
+ Result = Sect->Flags & macho::SF_PureInstructions;
} else {
InMemoryStruct<macho::Section> Sect;
getSection(DRI, Sect);
- Result = !strcmp(Sect->Name, "__text");
+ Result = Sect->Flags & macho::SF_PureInstructions;
}
return object_error::success;
}
@@ -581,14 +611,14 @@ error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI,
error_code MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
bool &Result) const {
- // FIXME: Unimplemented
+ // FIXME: Unimplemented.
Result = true;
return object_error::success;
}
error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
- bool &Result) const {
- // FIXME: Unimplemented
+ bool &Result) const {
+ // FIXME: Unimplemented.
Result = false;
return object_error::success;
}
@@ -612,6 +642,17 @@ error_code MachOObjectFile::isSectionZeroInit(DataRefImpl DRI,
return object_error::success;
}
+error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
+ bool &Result) const {
+ // Consider using the code from isSectionText to look for __const sections.
+ // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
+ // to use section attributes to distinguish code from data.
+
+ // FIXME: Unimplemented.
+ Result = false;
+ return object_error::success;
+}
+
error_code MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
DataRefImpl Symb,
bool &Result) const {
@@ -649,7 +690,7 @@ relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
}
relocation_iterator MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
uint32_t last_reloc;
- if (is64BitLoadCommand(MachOObj, Sec)) {
+ if (is64BitLoadCommand(MachOObj.get(), Sec)) {
InMemoryStruct<macho::Section64> Sect;
getSection64(Sec, Sect);
last_reloc = Sect->NumRelocationTableEntries;
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-17 19:50:07 +0000