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[patchpoint] Add support for symbolic patchpoint targets to SelectionDAG and the

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X86 backend.

The code generated for symbolic targets is identical to the code generated for
constant targets, except that a relocation is emitted to fix up the actual
target address at link-time. This allows IR and object files containing
patchpoints to be cached across JIT-invocations where the target address may
change.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235483 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames
2015-04-22 06:02:31 +00:00
parent 3aaf26d335
commit a1c0ce8518
6 changed files with 80 additions and 26 deletions
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18
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -7001,7 +7001,16 @@ void SelectionDAGBuilder::visitPatchpoint(ImmutableCallSite CS,
CallingConv::ID CC = CS.getCallingConv();
bool IsAnyRegCC = CC == CallingConv::AnyReg;
bool HasDef = !CS->getType()->isVoidTy();
SDValue Callee = getValue(CS->getOperand(2)); // <target>
SDValue Callee = getValue(CS->getOperand(PatchPointOpers::TargetPos));
// Handle immediate and symbolic callees.
if (auto* ConstCallee = dyn_cast<ConstantSDNode>(Callee))
Callee = DAG.getIntPtrConstant(ConstCallee->getZExtValue(),
/*isTarget=*/true);
else if (auto* SymbolicCallee = dyn_cast<GlobalAddressSDNode>(Callee))
Callee = DAG.getTargetGlobalAddress(SymbolicCallee->getGlobal(),
SDLoc(SymbolicCallee),
SymbolicCallee->getValueType(0));
// Get the real number of arguments participating in the call <numArgs>
SDValue NArgVal = getValue(CS.getArgument(PatchPointOpers::NArgPos));
@ -7041,11 +7050,8 @@ void SelectionDAGBuilder::visitPatchpoint(ImmutableCallSite CS,
Ops.push_back(DAG.getTargetConstant(
cast<ConstantSDNode>(NBytesVal)->getZExtValue(), MVT::i32));
// Assume that the Callee is a constant address.
// FIXME: handle function symbols in the future.
Ops.push_back(
DAG.getIntPtrConstant(cast<ConstantSDNode>(Callee)->getZExtValue(),
/*isTarget=*/true));
// Add the callee.
Ops.push_back(Callee);
// Adjust <numArgs> to account for any arguments that have been passed on the
// stack instead.