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Correctly handle references to section symbols.

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When processing assembly like

.long .text

we were creating a new undefined symbol .text. GAS on the other hand would
handle that as a reference to the .text section.

This patch implements that by creating the section symbols earlier so that
they are visible during asm parsing.

The patch also updates llvm-readobj to print the symbol number in the relocation
dump so that the test can differentiate between two sections with the same name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219829 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-10-15 18:55:30 +00:00
parent 1338612c55
commit ad04f5db82
8 changed files with 160 additions and 52 deletions
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6
include/llvm/MC/MCContext.h
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@@ -73,6 +73,10 @@ namespace llvm {
/// Symbols - Bindings of names to symbols.
SymbolTable Symbols;
/// ELF sections can have a corresponding symbol. This maps one to the
/// other.
DenseMap<const MCSectionELF*, MCSymbol*> SectionSymbols;
/// A maping from a local label number and an instance count to a symbol.
/// For example, in the assembly
/// 1:
@@ -231,6 +235,8 @@ namespace llvm {
MCSymbol *GetOrCreateSymbol(StringRef Name);
MCSymbol *GetOrCreateSymbol(const Twine &Name);
MCSymbol *getOrCreateSectionSymbol(const MCSectionELF &Section);
/// LookupSymbol - Get the symbol for \p Name, or null.
MCSymbol *LookupSymbol(StringRef Name) const;
MCSymbol *LookupSymbol(const Twine &Name) const;