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This patch improves the MCJIT runtime dynamic loader by adding new handling

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of zero-initialized sections, virtual sections and common symbols
and preventing the loading of sections which are not required for
execution such as debug information.

Patch by Andy Kaylor!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154610 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Preston Gurd
2012-04-12 20:13:57 +00:00
parent f0bcecc0d5
commit c68dda815e
28 changed files with 319 additions and 80 deletions
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21
lib/Object/COFFObjectFile.cpp
View File

@ -356,6 +356,27 @@ error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
return object_error::success;
}
error_code COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented
Result = true;
return object_error::success;
}
error_code COFFObjectFile::isSectionVirtual(DataRefImpl Sec,
bool &Result) const {
const coff_section *sec = toSec(Sec);
Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
return object_error::success;
}
error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented
Result = false;
return object_error::success;
}
error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
DataRefImpl Symb,
bool &Result) const {

55
lib/Object/MachOObjectFile.cpp
View File

@ -175,7 +175,12 @@ error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
BeginOffset = Entry->Value;
SectionIndex = Entry->SectionIndex;
if (!SectionIndex) {
Result = UnknownAddressOrSize;
uint32_t flags = SymbolRef::SF_None;
getSymbolFlags(DRI, flags);
if (flags & SymbolRef::SF_Common)
Result = Entry->Value;
else
Result = UnknownAddressOrSize;
return object_error::success;
}
// Unfortunately symbols are unsorted so we need to touch all
@ -198,7 +203,12 @@ error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
BeginOffset = Entry->Value;
SectionIndex = Entry->SectionIndex;
if (!SectionIndex) {
Result = UnknownAddressOrSize;
uint32_t flags = SymbolRef::SF_None;
getSymbolFlags(DRI, flags);
if (flags & SymbolRef::SF_Common)
Result = Entry->Value;
else
Result = UnknownAddressOrSize;
return object_error::success;
}
// Unfortunately symbols are unsorted so we need to touch all
@ -265,19 +275,22 @@ error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
uint32_t &Result) const {
uint16_t MachOFlags;
uint8_t MachOType;
uint8_t MachOSectionIndex;
if (MachOObj->is64Bit()) {
InMemoryStruct<macho::Symbol64TableEntry> Entry;
getSymbol64TableEntry(DRI, Entry);
MachOFlags = Entry->Flags;
MachOType = Entry->Type;
MachOSectionIndex = Entry->SectionIndex;
} else {
InMemoryStruct<macho::SymbolTableEntry> Entry;
getSymbolTableEntry(DRI, Entry);
MachOFlags = Entry->Flags;
MachOType = Entry->Type;
MachOSectionIndex = Entry->SectionIndex;
}
// TODO: Correctly set SF_ThreadLocal and SF_Common.
// TODO: Correctly set SF_ThreadLocal
Result = SymbolRef::SF_None;
if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
@ -286,8 +299,11 @@ error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
if (MachOFlags & macho::STF_StabsEntryMask)
Result |= SymbolRef::SF_FormatSpecific;
if (MachOType & MachO::NlistMaskExternal)
if (MachOType & MachO::NlistMaskExternal) {
Result |= SymbolRef::SF_Global;
if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
Result |= SymbolRef::SF_Common;
}
if (MachOFlags & (MachO::NListDescWeakRef | MachO::NListDescWeakDef))
Result |= SymbolRef::SF_Weak;
@ -566,6 +582,37 @@ error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI,
return object_error::success;
}
error_code MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented
Result = true;
return object_error::success;
}
error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented
Result = false;
return object_error::success;
}
error_code MachOObjectFile::isSectionZeroInit(DataRefImpl DRI,
bool &Result) const {
if (MachOObj->is64Bit()) {
InMemoryStruct<macho::Section64> Sect;
getSection64(DRI, Sect);
Result = (Sect->Flags & MachO::SectionTypeZeroFill ||
Sect->Flags & MachO::SectionTypeZeroFillLarge);
} else {
InMemoryStruct<macho::Section> Sect;
getSection(DRI, Sect);
Result = (Sect->Flags & MachO::SectionTypeZeroFill ||
Sect->Flags & MachO::SectionTypeZeroFillLarge);
}
return object_error::success;
}
error_code MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
DataRefImpl Symb,
bool &Result) const {