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Require members of llvm.used to be named.

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The effect of llvm.used is to introduce an invisible reference, so this seems
a reasonable restriction. It will be used to provide an easy ordering of
the entries in llvm.used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183743 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-06-11 13:18:13 +00:00
parent 6c921a55f4
commit 9f8e6da019
2 changed files with 8 additions and 7 deletions
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14
docs/LangRef.rst
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@ -2932,8 +2932,8 @@ The '``llvm.used``' Global Variable
The ``@llvm.used`` global is an array which has
:ref:`appending linkage <linkage_appending>`. This array contains a list of
pointers to global variables, functions and aliases which may optionally have a
pointer cast formed of bitcast or getelementptr. For example, a legal
pointers to named global variables, functions and aliases which may optionally
have a pointer cast formed of bitcast or getelementptr. For example, a legal
use of it is:
.. code-block:: llvm
@ -2948,11 +2948,11 @@ use of it is:
If a symbol appears in the ``@llvm.used`` list, then the compiler, assembler,
and linker are required to treat the symbol as if there is a reference to the
symbol that it cannot see. For example, if a variable has internal linkage and
no references other than that from the ``@llvm.used`` list, it cannot be
deleted. This is commonly used to represent references from inline asms and
other things the compiler cannot "see", and corresponds to
"``attribute((used))``" in GNU C.
symbol that it cannot see (which is why they have to be named). For example, if
a variable has internal linkage and no references other than that from the
``@llvm.used`` list, it cannot be deleted. This is commonly used to represent
references from inline asms and other things the compiler cannot "see", and
corresponds to "``attribute((used))``" in GNU C.
On some targets, the code generator must emit a directive to the
assembler or object file to prevent the assembler and linker from

1
lib/IR/Verifier.cpp
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@ -467,6 +467,7 @@ void Verifier::visitGlobalVariable(GlobalVariable &GV) {
Assert1(
isa<GlobalVariable>(V) || isa<Function>(V) || isa<GlobalAlias>(V),
"invalid llvm.used member", V);
Assert1(V->hasName(), "members of llvm.used must be named", V);
}
}
}