From 94c6566055b856c9580a2b27bf4dd3aa8ac61482 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Tue, 16 Feb 2016 23:48:04 +0000 Subject: [WebAssembly] Implement __builtin_frame_address. Differential Revision: http://reviews.llvm.org/D17307 llvm-svn: 261032 --- .../Target/WebAssembly/WebAssemblyISelLowering.cpp | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) (limited to 'llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp') diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp index 2027e8b..c5ec506 100644 --- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp +++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp @@ -542,9 +542,8 @@ SDValue WebAssemblyTargetLowering::LowerOperation(SDValue Op, case ISD::RETURNADDR: // Probably nothing meaningful can be returned here. fail(DL, DAG, "WebAssembly hasn't implemented __builtin_return_address"); return SDValue(); - case ISD::FRAMEADDR: // TODO: Make this return the userspace frame address - fail(DL, DAG, "WebAssembly hasn't implemented __builtin_frame_address"); - return SDValue(); + case ISD::FRAMEADDR: + return LowerFRAMEADDR(Op, DAG); case ISD::CopyToReg: return LowerCopyToReg(Op, DAG); } @@ -579,6 +578,21 @@ SDValue WebAssemblyTargetLowering::LowerFrameIndex(SDValue Op, return DAG.getTargetFrameIndex(FI, Op.getValueType()); } +SDValue WebAssemblyTargetLowering::LowerFRAMEADDR(SDValue Op, + SelectionDAG &DAG) const { + // Non-zero depths are not supported by WebAssembly currently. Use the + // legalizer's default expansion, which is to return 0 (what this function is + // documented to do). + if (cast(Op.getOperand(0))->getZExtValue() > 0) + return SDValue(); + + DAG.getMachineFunction().getFrameInfo()->setFrameAddressIsTaken(true); + EVT VT = Op.getValueType(); + unsigned FP = + Subtarget->getRegisterInfo()->getFrameRegister(DAG.getMachineFunction()); + return DAG.getCopyFromReg(DAG.getEntryNode(), SDLoc(Op), FP, VT); +} + SDValue WebAssemblyTargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const { SDLoc DL(Op); -- cgit v1.1