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By popular demand, link up types by name if they are isomorphic and one is an

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autorenamed version of the other.   This makes the IR easier to read, because
we don't end up with random renamed versions of the types after LTO'ing a large app.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146728 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-12-16 08:36:07 +00:00
parent 94438ba538
commit 9646acfccf
2 changed files with 34 additions and 0 deletions
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25
lib/Linker/LinkModules.cpp
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@ -543,6 +543,31 @@ void ModuleLinker::computeTypeMapping() {
TypeMap.addTypeMapping(DGV->getType(), I->getType());
}
// Incorporate types by name, scanning all the types in the source module.
// At this point, the destination module may have a type "%foo = { i32 }" for
// example. When the source module got loaded into the same LLVMContext, if
// it had the same type, it would have been renamed to "%foo.42 = { i32 }".
// Though it isn't required for correctness, attempt to link these up to clean
// up the IR.
std::vector<StructType*> SrcStructTypes;
SrcM->findUsedStructTypes(SrcStructTypes);
for (unsigned i = 0, e = SrcStructTypes.size(); i != e; ++i) {
StructType *ST = SrcStructTypes[i];
if (!ST->hasName()) continue;
// Check to see if there is a dot in the name followed by a digit.
size_t DotPos = ST->getName().rfind('.');
if (DotPos == 0 || DotPos == StringRef::npos ||
ST->getName().back() == '.' || !isdigit(ST->getName()[DotPos+1]))
continue;
// Check to see if the destination module has a struct with the prefix name.
if (StructType *DST = DstM->getTypeByName(ST->getName().substr(0, DotPos)))
TypeMap.addTypeMapping(DST, ST);
}
// Don't bother incorporating aliases, they aren't generally typed well.
// Now that we have discovered all of the type equivalences, get a body for

9
test/Linker/link-type-names.ll Normal file
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@ -0,0 +1,9 @@
; RUN: echo "%X = type { i32 } @G2 = global %X { i32 4 }" > %t.ll
; RUN: llvm-link %s %t.ll -S | FileCheck %s
%X = type { i32 }
@G = global %X { i32 4 }
; CHECK: @G = global %X { i32 4 }
; CHECK: @G2 = global %X { i32 4 }