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| -rw-r--r-- | lld/docs/design.rst | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lld/docs/design.rst b/lld/docs/design.rst index 19ea8110d3a..6a8d0ff7d5e 100644 --- a/lld/docs/design.rst +++ b/lld/docs/design.rst @@ -42,6 +42,30 @@ containing the c-string literal "hello world". The Atom "main" has two references. One is the call site for the call to printf, and the other is a reference for the instruction that loads the address of the c-string literal. +There are only four different types of atoms: + + * DefinedAtom + 95% of all atoms. This is a chunk of code or data + + * UndefinedAtom + This is a place holder in object files for a reference to some atom + outside the translation unit.During core linking it is usually replaced + by (coalesced into) another Atom. + + * SharedLibraryAtom + If a required symbol name turns out to be defined in a dynamic shared + library (and not some object file). A SharedLibraryAtom is the + placeholder Atom used to represent that fact. + + It is similar to an UndefinedAtom, but it also tracks information + about the associated shared library. + + * AbsoluteAtom + This is for embedded support where some stuff is implemented in ROM at + some fixed address. This atom has no content. It is just an address + that the Writer needs to fixup any references to point to. + + File Model ---------- |
