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If inlining a call to a function that contains dynamic allocas, wrap the

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resultant code with llvm.stacksave/llvm.stackrestore intrinsics.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25286 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-01-13 19:34:14 +00:00
parent 1fdf4a859f
commit bf229f488a
1 changed files with 30 additions and 0 deletions
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30
lib/Transforms/Utils/InlineFunction.cpp
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@ -215,6 +215,36 @@ bool llvm::InlineFunction(CallSite CS) {
}
}
// If the inlined code contained dynamic alloca instructions, wrap the inlined
// code with llvm.stacksave/llvm.stackrestore intrinsics.
if (InlinedFunctionInfo.ContainsDynamicAllocas) {
Module *M = Caller->getParent();
const Type *SBytePtr = PointerType::get(Type::SByteTy);
// Get the two intrinsics we care about.
Function *StackSave, *StackRestore;
StackSave = M->getOrInsertFunction("llvm.stacksave", SBytePtr, NULL);
StackRestore = M->getOrInsertFunction("llvm.stackrestore", Type::VoidTy,
SBytePtr, NULL);
// Insert the llvm.stacksave.
Value *SavedPtr = new CallInst(StackSave, "savedstack",
FirstNewBlock->begin());
// Insert a call to llvm.stackrestore before any return instructions in the
// inlined function.
for (unsigned i = 0, e = Returns.size(); i != e; ++i)
new CallInst(StackRestore, SavedPtr, "", Returns[i]);
// If we are inlining an invoke instruction, insert restores before each
// unwind. These unwinds will be rewritten into branches later.
if (InlinedFunctionInfo.ContainsUnwinds && isa<InvokeInst>(TheCall)) {
for (Function::iterator BB = FirstNewBlock, E = Caller->end();
BB != E; ++BB)
if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->getTerminator()))
new CallInst(StackRestore, SavedPtr, "", UI);
}
}
// If we are inlining tail call instruction through a call site that isn't
// marked 'tail', we must remove the tail marker for any calls in the inlined
// code.