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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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28
include/llvm/Object/ObjectFile.h
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@@ -158,11 +158,16 @@ public:
error_code isText(bool &Result) const;
error_code isData(bool &Result) const;
error_code isBSS(bool &Result) const;
error_code isRequiredForExecution(bool &Result) const;
error_code isVirtual(bool &Result) const;
error_code isZeroInit(bool &Result) const;
error_code containsSymbol(SymbolRef S, bool &Result) const;
relocation_iterator begin_relocations() const;
relocation_iterator end_relocations() const;
DataRefImpl getRawDataRefImpl() const;
};
typedef content_iterator<SectionRef> section_iterator;
@@ -217,6 +222,9 @@ public:
/// Get symbol flags (bitwise OR of SymbolRef::Flags)
error_code getFlags(uint32_t &Result) const;
/// @brief Return true for common symbols such as uninitialized globals
error_code isCommon(bool &Result) const;
/// @brief Get section this symbol is defined in reference to. Result is
/// end_sections() if it is undefined or is an absolute symbol.
error_code getSection(section_iterator &Result) const;
@@ -299,6 +307,11 @@ protected:
virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const = 0;
virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const = 0;
virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const = 0;
virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
bool &Res) const = 0;
// 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 sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
bool &Result) const = 0;
virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
@@ -481,6 +494,18 @@ inline error_code SectionRef::isBSS(bool &Result) const {
return OwningObject->isSectionBSS(SectionPimpl, Result);
}
inline error_code SectionRef::isRequiredForExecution(bool &Result) const {
return OwningObject->isSectionRequiredForExecution(SectionPimpl, Result);
}
inline error_code SectionRef::isVirtual(bool &Result) const {
return OwningObject->isSectionVirtual(SectionPimpl, Result);
}
inline error_code SectionRef::isZeroInit(bool &Result) const {
return OwningObject->isSectionZeroInit(SectionPimpl, Result);
}
inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
Result);
@@ -494,6 +519,9 @@ inline relocation_iterator SectionRef::end_relocations() const {
return OwningObject->getSectionRelEnd(SectionPimpl);
}
inline DataRefImpl SectionRef::getRawDataRefImpl() const {
return SectionPimpl;
}
/// RelocationRef
inline RelocationRef::RelocationRef(DataRefImpl RelocationP,