diff options
Diffstat (limited to 'llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp index aa7bba8b17d..dc9afb73a93 100644 --- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp +++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp @@ -729,6 +729,18 @@ WebAssemblyTargetLowering::LowerCall(CallLoweringInfo &CLI, FINode = DAG.getIntPtrConstant(0, DL); } + if (Callee->getOpcode() == ISD::GlobalAddress) { + // If the callee is a GlobalAddress node (quite common, every direct call + // is) turn it into a TargetGlobalAddress node so that LowerGlobalAddress + // doesn't at MO_GOT which is not needed for direct calls. + GlobalAddressSDNode* GA = cast<GlobalAddressSDNode>(Callee); + Callee = DAG.getTargetGlobalAddress(GA->getGlobal(), DL, + getPointerTy(DAG.getDataLayout()), + GA->getOffset()); + Callee = DAG.getNode(WebAssemblyISD::Wrapper, DL, + getPointerTy(DAG.getDataLayout()), Callee); + } + // Compute the operands for the CALLn node. SmallVector<SDValue, 16> Ops; Ops.push_back(Chain); @@ -983,9 +995,35 @@ SDValue WebAssemblyTargetLowering::LowerGlobalAddress(SDValue Op, "Unexpected target flags on generic GlobalAddressSDNode"); if (GA->getAddressSpace() != 0) fail(DL, DAG, "WebAssembly only expects the 0 address space"); - return DAG.getNode( - WebAssemblyISD::Wrapper, DL, VT, - DAG.getTargetGlobalAddress(GA->getGlobal(), DL, VT, GA->getOffset())); + + unsigned Flags = 0; + if (isPositionIndependent()) { + const GlobalValue *GV = GA->getGlobal(); + if (getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV)) { + MachineFunction &MF = DAG.getMachineFunction(); + MVT PtrVT = getPointerTy(MF.getDataLayout()); + const char *BaseName; + if (GV->getValueType()->isFunctionTy()) + BaseName = MF.createExternalSymbolName("__table_base"); + else + BaseName = MF.createExternalSymbolName("__memory_base"); + SDValue BaseAddr = + DAG.getNode(WebAssemblyISD::Wrapper, DL, PtrVT, + DAG.getTargetExternalSymbol(BaseName, PtrVT)); + + SDValue SymAddr = DAG.getNode( + WebAssemblyISD::WrapperPIC, DL, VT, + DAG.getTargetGlobalAddress(GA->getGlobal(), DL, VT, GA->getOffset())); + + return DAG.getNode(ISD::ADD, DL, VT, BaseAddr, SymAddr); + } else { + Flags |= WebAssemblyII::MO_GOT; + } + } + + return DAG.getNode(WebAssemblyISD::Wrapper, DL, VT, + DAG.getTargetGlobalAddress(GA->getGlobal(), DL, VT, + GA->getOffset(), Flags)); } SDValue |
