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Reland "[IR] Make AttributeSetNode public, avoid temporary AttributeList copies" 

This re-lands r299875.

I introduced a bug in Clang code responsible for replacing K&R, no
prototype declarations with a real function definition with a prototype.
The bug was here:

       // Collect any return attributes from the call.
  -    if (oldAttrs.hasAttributes(llvm::AttributeList::ReturnIndex))
  -      newAttrs.push_back(llvm::AttributeList::get(newFn->getContext(),
  -                                                  oldAttrs.getRetAttributes()));
  +    newAttrs.push_back(oldAttrs.getRetAttributes());

Previously getRetAttributes() carried AttributeList::ReturnIndex in its
AttributeList. Now that we return the AttributeSetNode* directly, it no
longer carries that index, and we call this overload with a single node:
  AttributeList::get(LLVMContext&, ArrayRef<AttributeSetNode*>)

That aborted with an assertion on x86_32 targets. I added an explicit
triple to the test and added CHECKs to help find issues like this in the
future sooner.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@299899 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2017-04-10 23:31:05 +00:00
parent 0d684b104b
commit c84d5c0f2c
2 changed files with 13 additions and 12 deletions
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14
lib/CodeGen/CodeGenModule.cpp
View File

@ -2935,13 +2935,11 @@ static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
continue;
// Get the call site's attribute list.
SmallVector<llvm::AttributeList, 8> newAttrs;
SmallVector<llvm::AttributeSetNode *, 8> newAttrs;
llvm::AttributeList oldAttrs = callSite.getAttributes();
// Collect any return attributes from the call.
if (oldAttrs.hasAttributes(llvm::AttributeList::ReturnIndex))
newAttrs.push_back(llvm::AttributeList::get(newFn->getContext(),
oldAttrs.getRetAttributes()));
newAttrs.push_back(oldAttrs.getRetAttributes());
// If the function was passed too few arguments, don't transform.
unsigned newNumArgs = newFn->arg_size();
@ -2959,16 +2957,12 @@ static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
}
// Add any parameter attributes.
if (oldAttrs.hasAttributes(argNo + 1))
newAttrs.push_back(llvm::AttributeList::get(
newFn->getContext(), oldAttrs.getParamAttributes(argNo + 1)));
newAttrs.push_back(oldAttrs.getParamAttributes(argNo + 1));
}
if (dontTransform)
continue;
if (oldAttrs.hasAttributes(llvm::AttributeList::FunctionIndex))
newAttrs.push_back(llvm::AttributeList::get(newFn->getContext(),
oldAttrs.getFnAttributes()));
newAttrs.push_back(oldAttrs.getFnAttributes());
// Okay, we can transform this. Create the new call instruction and copy
// over the required information.

11
test/CodeGen/2006-05-19-SingleEltReturn.c
View File

@ -1,12 +1,13 @@
// Test returning a single element aggregate value containing a double.
// RUN: %clang_cc1 -triple i686-linux %s -emit-llvm -o - | FileCheck %s --check-prefix=X86_32
// RUN: %clang_cc1 %s -emit-llvm -o -
struct X {
double D;
};
struct Y {
struct X x;
struct Y {
struct X x;
};
struct Y bar();
@ -21,3 +22,9 @@ struct Y bar() {
return a;
}
// X86_32: define void @foo(%struct.Y* %P)
// X86_32: call void @bar(%struct.Y* sret %{{[^),]*}})
// X86_32: define void @bar(%struct.Y* noalias sret %{{[^,)]*}})
// X86_32: ret void