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This patch adds new functions to the SectionRef and ObjectFile interfaces to determine whether or not a section is meant to be read-only. These functions will be used by the MCJIT RuntimeDyld to give hints to the memory manager during the object loading process in a future patch.

Browse Source 
Patch by Ashok Thirumurthi.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165586 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Kaylor 2012-10-10 01:41:33 +00:00
parent 97d9f081a9
commit 3a129c8592
6 changed files with 41 additions and 1 deletions
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1
include/llvm/Object/COFF.h
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@ -128,6 +128,7 @@ protected:
virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
bool &Res) const;
virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,

16
include/llvm/Object/ELF.h
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@ -640,6 +640,7 @@ protected:
bool &Res) const;
virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const;
virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
bool &Result) const;
virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
@ -1288,7 +1289,8 @@ error_code ELFObjectFile<target_endianness, is64Bits>
}
template<support::endianness target_endianness, bool is64Bits>
error_code ELFObjectFile<target_endianness, is64Bits>::isSectionZeroInit(DataRefImpl Sec,
error_code ELFObjectFile<target_endianness, is64Bits>
::isSectionZeroInit(DataRefImpl Sec,
bool &Result) const {
const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
// For ELF, all zero-init sections are virtual (that is, they occupy no space
@ -1300,6 +1302,18 @@ error_code ELFObjectFile<target_endianness, is64Bits>::isSectionZeroInit(DataRef
return object_error::success;
}
template<support::endianness target_endianness, bool is64Bits>
error_code ELFObjectFile<target_endianness, is64Bits>
::isSectionReadOnlyData(DataRefImpl Sec,
bool &Result) const {
const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
if (sec->sh_flags & ELF::SHF_WRITE || sec->sh_flags & ELF::SHF_EXECINSTR)
Result = false;
else
Result = true;
return object_error::success;
}
template<support::endianness target_endianness, bool is64Bits>
error_code ELFObjectFile<target_endianness, is64Bits>
::sectionContainsSymbol(DataRefImpl Sec,

1
include/llvm/Object/MachO.h
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@ -76,6 +76,7 @@ protected:
bool &Res) const;
virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const;
virtual error_code sectionContainsSymbol(DataRefImpl DRI, DataRefImpl S,
bool &Result) const;
virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;

6
include/llvm/Object/ObjectFile.h
View File

@ -163,6 +163,7 @@ public:
error_code isRequiredForExecution(bool &Result) const;
error_code isVirtual(bool &Result) const;
error_code isZeroInit(bool &Result) const;
error_code isReadOnlyData(bool &Result) const;
error_code containsSymbol(SymbolRef S, bool &Result) const;
@ -316,6 +317,7 @@ protected:
// A section is 'virtual' if its contents aren't present in the object image.
virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const = 0;
virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const = 0;
virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const = 0;
virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
bool &Result) const = 0;
virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
@ -510,6 +512,10 @@ inline error_code SectionRef::isZeroInit(bool &Result) const {
return OwningObject->isSectionZeroInit(SectionPimpl, Result);
}
inline error_code SectionRef::isReadOnlyData(bool &Result) const {
return OwningObject->isSectionReadOnlyData(SectionPimpl, Result);
}
inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
Result);

7
lib/Object/COFFObjectFile.cpp
View File

@ -377,6 +377,13 @@ error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec,
return object_error::success;
}
error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
DataRefImpl Symb,
bool &Result) const {

11
lib/Object/MachOObjectFile.cpp
View File

@ -612,6 +612,17 @@ 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 {