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author | Daniel Dunbar <daniel@zuster.org> | 2010-03-19 03:18:15 +0000 |
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committer | Daniel Dunbar <daniel@zuster.org> | 2010-03-19 03:18:15 +0000 |
commit | 8ad0dccbf2f0c5ecf9fdad93ac0207f6eaabaa1b (patch) | |
tree | 3b9769d9f83220508afa39c90ae609d36ee53e72 /lib | |
parent | 939f8d7ca23b95acdd5d1e71a7579ee8d33e7fd6 (diff) | |
download | external_llvm-8ad0dccbf2f0c5ecf9fdad93ac0207f6eaabaa1b.zip external_llvm-8ad0dccbf2f0c5ecf9fdad93ac0207f6eaabaa1b.tar.gz external_llvm-8ad0dccbf2f0c5ecf9fdad93ac0207f6eaabaa1b.tar.bz2 |
MC/Mach-O/x86_64: Add getAtom[ForAddress].
- These find the defining symbol which identifies the containing atom for a symbol or address. They are currently very slow, but will be eliminated eventually.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98925 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
-rw-r--r-- | lib/MC/MCAssembler.cpp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp index 003f032..0d4f98c 100644 --- a/lib/MC/MCAssembler.cpp +++ b/lib/MC/MCAssembler.cpp @@ -1062,6 +1062,42 @@ bool MCAssembler::isSymbolLinkerVisible(const MCSymbolData *SD) const { SD->getFragment()->getParent()->getSection()); } +const MCSymbolData *MCAssembler::getAtomForAddress(const MCSectionData *Section, + uint64_t Address) const { + const MCSymbolData *Best = 0; + for (MCAssembler::const_symbol_iterator it = symbol_begin(), + ie = symbol_end(); it != ie; ++it) { + // Ignore non-linker visible symbols. + if (!isSymbolLinkerVisible(it)) + continue; + + // Ignore symbols not in the same section. + if (!it->getFragment() || it->getFragment()->getParent() != Section) + continue; + + // Otherwise, find the closest symbol preceding this address (ties are + // resolved in favor of the last defined symbol). + if (it->getAddress() <= Address && + (!Best || it->getAddress() >= Best->getAddress())) + Best = it; + } + + return Best; +} + +const MCSymbolData *MCAssembler::getAtom(const MCSymbolData *SD) const { + // Linker visible symbols define atoms. + if (isSymbolLinkerVisible(SD)) + return SD; + + // Absolute and undefined symbols have no defining atom. + if (!SD->getFragment()) + return 0; + + // Otherwise, search by address. + return getAtomForAddress(SD->getFragment()->getParent(), SD->getAddress()); +} + bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout, MCAsmFixup &Fixup, MCDataFragment *DF, MCValue &Target, uint64_t &Value) const { |