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[WebAssembly] Report more meaningful error messages for some unsupported

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ops.

Computed gotos and RETURNADDR may never be supported; we can do
FRAMEADDR in the future.

llvm-svn: 260759
This commit is contained in:
Derek Schuff 2016-02-12 22:56:03 +00:00
parent 702277f07f
commit eed189f4ef
2 changed files with 17 additions and 4 deletions
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13
lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
View File

@ -61,6 +61,8 @@ WebAssemblyTargetLowering::WebAssemblyTargetLowering(
setOperationAction(ISD::GlobalAddress, MVTPtr, Custom);
setOperationAction(ISD::ExternalSymbol, MVTPtr, Custom);
setOperationAction(ISD::JumpTable, MVTPtr, Custom);
setOperationAction(ISD::BlockAddress, MVTPtr, Custom);
setOperationAction(ISD::BRIND, MVT::Other, Custom);
// Take the default expansion for va_arg, va_copy, and va_end. There is no
// default action for va_start, so we do that custom.
@ -515,6 +517,7 @@ SDValue WebAssemblyTargetLowering::LowerFormalArguments(
SDValue WebAssemblyTargetLowering::LowerOperation(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
switch (Op.getOpcode()) {
default:
llvm_unreachable("unimplemented operation lowering");
@ -531,6 +534,16 @@ SDValue WebAssemblyTargetLowering::LowerOperation(SDValue Op,
return LowerBR_JT(Op, DAG);
case ISD::VASTART:
return LowerVASTART(Op, DAG);
case ISD::BlockAddress:
case ISD::BRIND:
fail(DL, DAG, "WebAssembly hasn't implemented computed gotos");
return SDValue();
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();
}
}

8
lib/Target/WebAssembly/known_gcc_test_failures.txt
View File

@ -54,22 +54,22 @@ pr38151.c
pr28982b.c
# Cannot select brind.
# Computed gotos are not supported (Cannot select BlockAddress/BRIND)
20040302-1.c
20071210-1.c
920501-4.c
920501-5.c
# Cannot select BlockAddress.
comp-goto-1.c
980526-1.c
990208-1.c
# unimplemented operation lowering.
# WebAssembly hasn't implemented (will never?) __builtin_return_address
20010122-1.c
20030323-1.c
20030811-1.c
pr17377.c
# WebAssembly hasn't implemented __builtin_frame_address
frame-address.c
# Error: invalid output constraint '=t' in asm.