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POGet a function declaration from another llvm::Module
primarykey
Id
9023029
data
AcceptedAnswerId
9109925
AnswerCount
1
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2012-01-26T18:09:03.630
FavoriteCount
1
LastActivityDate
2012-02-02T09:31:26.307
LastEditDate
LastEditorUserId
0
OwnerUserId
637669
ParentId
0
PostTypeId
1
Score
3
ViewCount
2014
LastEditorDisplayName
text
Body
In my application i have 2 LLVM modules - the runtime one (which contains <code>void foo(int * a)</code> function definition) and executable one (which i'm creating using LLVM C++ API). In my executable module i create <code>int main(int argc, char ** argv)</code> and want to put <code>llvm::CallInst</code> into it's body, which would call <code>foo()</code> function from runtime module. Here is my code: <pre><code>Function * fooF = Function::Create(runtimeModule->getFunction("foo")->getFunctionType(), GlobalValue::WeakAnyLinkage, "foo", execModule); </code></pre> After that, i link two modules together: <pre><code>Linker linker("blabla", execModule, false); linker.LinkInFile("/path/to/runtime.bc", false); execModule = linker.releaseModule(); </code></pre> This compiles OK, however when i run Verifier pass on linked module i get: <pre><code>Global is external, but doesn't have external or dllimport or weak linkage! void (%i32*)* @foo invalid linkage type for function declaration void (%i32*)* @foo </code></pre> It's worth mentioning, that all globals in runtime module are internalized using Internalize pass. After linking, but before running Verifier, i'm running Dead Global Elimination pass amongst some other optimizations. And when i do <code>dump()</code> on resulting module, i see, that <code>@foo</code> which is coming from runtime module gets removed too, despite it's used by <code>main()</code>. It seems, LLVM thinks that <code>@foo</code> definition in runtime and <code>@foo</code> declaration in executable are unrelated. I've tried to play with linkage types - no luck. So, what is the right way to create a call to the function from another module?
Tags
<llvm><codegen>
Title
Get a function declaration from another llvm::Module
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