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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.
Patch by Ashok Thirumurthi. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165586 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -128,6 +128,7 @@ protected:
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virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
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virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
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bool &Res) const;
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bool &Res) const;
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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@ -640,6 +640,7 @@ protected:
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bool &Res) const;
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bool &Res) const;
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const;
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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bool &Result) const;
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bool &Result) const;
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virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
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virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
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@ -1288,7 +1289,8 @@ error_code ELFObjectFile<target_endianness, is64Bits>
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}
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}
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template<support::endianness target_endianness, bool is64Bits>
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>::isSectionZeroInit(DataRefImpl Sec,
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error_code ELFObjectFile<target_endianness, is64Bits>
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::isSectionZeroInit(DataRefImpl Sec,
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bool &Result) const {
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bool &Result) const {
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const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
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const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
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// For ELF, all zero-init sections are virtual (that is, they occupy no space
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// For ELF, all zero-init sections are virtual (that is, they occupy no space
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@ -1300,6 +1302,18 @@ error_code ELFObjectFile<target_endianness, is64Bits>::isSectionZeroInit(DataRef
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return object_error::success;
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return object_error::success;
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}
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::isSectionReadOnlyData(DataRefImpl Sec,
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bool &Result) const {
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const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p);
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if (sec->sh_flags & ELF::SHF_WRITE || sec->sh_flags & ELF::SHF_EXECINSTR)
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Result = false;
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else
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Result = true;
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return object_error::success;
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}
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template<support::endianness target_endianness, bool is64Bits>
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::sectionContainsSymbol(DataRefImpl Sec,
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::sectionContainsSymbol(DataRefImpl Sec,
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@ -76,6 +76,7 @@ protected:
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bool &Res) const;
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bool &Res) const;
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
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virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const;
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virtual error_code sectionContainsSymbol(DataRefImpl DRI, DataRefImpl S,
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virtual error_code sectionContainsSymbol(DataRefImpl DRI, DataRefImpl S,
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bool &Result) const;
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bool &Result) const;
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virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
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virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
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@ -163,6 +163,7 @@ public:
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error_code isRequiredForExecution(bool &Result) const;
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error_code isRequiredForExecution(bool &Result) const;
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error_code isVirtual(bool &Result) const;
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error_code isVirtual(bool &Result) const;
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error_code isZeroInit(bool &Result) const;
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error_code isZeroInit(bool &Result) const;
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error_code isReadOnlyData(bool &Result) const;
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error_code containsSymbol(SymbolRef S, bool &Result) const;
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error_code containsSymbol(SymbolRef S, bool &Result) const;
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@ -316,6 +317,7 @@ protected:
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// A section is 'virtual' if its contents aren't present in the object image.
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// A section is 'virtual' if its contents aren't present in the object image.
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const = 0;
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
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bool &Result) const = 0;
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bool &Result) const = 0;
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virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
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virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
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@ -510,6 +512,10 @@ inline error_code SectionRef::isZeroInit(bool &Result) const {
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return OwningObject->isSectionZeroInit(SectionPimpl, Result);
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return OwningObject->isSectionZeroInit(SectionPimpl, Result);
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}
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}
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inline error_code SectionRef::isReadOnlyData(bool &Result) const {
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return OwningObject->isSectionReadOnlyData(SectionPimpl, Result);
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}
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inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
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inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
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return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
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return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
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Result);
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Result);
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@ -377,6 +377,13 @@ error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec,
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return object_error::success;
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return object_error::success;
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}
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}
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error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
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bool &Result) const {
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// FIXME: Unimplemented.
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Result = false;
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return object_error::success;
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}
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error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
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error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
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DataRefImpl Symb,
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DataRefImpl Symb,
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bool &Result) const {
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bool &Result) const {
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@ -612,6 +612,17 @@ error_code MachOObjectFile::isSectionZeroInit(DataRefImpl DRI,
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return object_error::success;
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return object_error::success;
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}
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}
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error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
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bool &Result) const {
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// Consider using the code from isSectionText to look for __const sections.
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// Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
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// to use section attributes to distinguish code from data.
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// FIXME: Unimplemented.
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Result = false;
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return object_error::success;
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}
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error_code MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
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error_code MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
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DataRefImpl Symb,
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DataRefImpl Symb,
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bool &Result) const {
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bool &Result) const {
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