maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Update comments. 

llvm-svn: 259127
This commit is contained in:
Rui Ueyama 2016-01-29 00:20:09 +00:00
parent 00d9639c24
commit 0e36e09b9c
1 changed files with 5 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
lld/ELF/Writer.cpp
View File

@ -781,16 +781,14 @@ template <class ELFT> void Writer<ELFT>::addReservedSymbols() {
// If the "_end" symbol is referenced, it is expected to point to the address
// right after the data segment. Usually, this symbol points to the end
// of .bss section or to the end of .data section if .bss section is absent.
// The order of the sections can be affected by linker script,
// so it is hard to predict which section will be the last one.
// So, if this symbol is referenced, we just add the placeholder here
// and update its value later.
// We don't know the final address of _end yet, so just add a symbol here,
// and fix ElfSym<ELFT>::End.st_value later.
if (Symtab.find("_end"))
Symtab.addAbsolute("_end", ElfSym<ELFT>::End);
// If there is an undefined symbol "end", we should initialize it
// with the same value as "_end". In any other case it should stay intact,
// because it is an allowable name for a user symbol.
// Define "end" as an alias to "_end" if it is used but not defined.
// We don't want to define that unconditionally because we don't want to
// break programs that uses "end" as a regular symbol.
if (SymbolBody *B = Symtab.find("end"))
if (B->isUndefined())
Symtab.addAbsolute("end", ElfSym<ELFT>::End);