WebAssembly: basic bitcode → assembly CodeGen test
Summary:
Add a basic CodeGen bitcode test which (for now) only prints out the function name and nothing else. The current code merely implements the basic needed for the test run to not crash / assert. Getting to that point required:
- Basic InstPrinter.
- Basic AsmPrinter.
- DiagnosticInfoUnsupported (not strictly required, but nice to have, duplicated from AMDGPU/BPF's ISelLowering).
- Some SP and register setup in WebAssemblyTargetLowering.
- Basic LowerFormalArguments.
- GenInstrInfo.
- Placeholder LowerFormalArguments.
- Placeholder CanLowerReturn and LowerReturn.
- Basic DAGToDAGISel::Select, which requiresGenDAGISel.inc as well as GET_INSTRINFO_ENUM with GenInstrInfo.inc.
- Remove WebAssemblyFrameLowering::determineCalleeSaves and rely on default.
- Implement WebAssemblyFrameLowering::hasFP, same as AArch64's implementation.
Follow-up patches will implement a real AsmPrinter, which will require adding MI opcodes specific to WebAssembly.
Reviewers: sunfish
Subscribers: aemerson, jfb, llvm-commits
Differential Revision: http://reviews.llvm.org/D11369
llvm-svn: 242939
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
index 518ef33..58a2375 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
@@ -56,13 +56,49 @@
SDNode *Select(SDNode *Node) override;
+// Include the pieces autogenerated from the target description.
+#include "WebAssemblyGenDAGISel.inc"
+
private:
// add select functions here...
};
} // end anonymous namespace
SDNode *WebAssemblyDAGToDAGISel::Select(SDNode *Node) {
- llvm_unreachable("TODO: implement Select");
+ // Dump information about the Node being selected.
+ DEBUG(errs() << "Selecting: ");
+ DEBUG(Node->dump(CurDAG));
+ DEBUG(errs() << "\n");
+
+ // If we have a custom node, we already have selected!
+ if (Node->isMachineOpcode()) {
+ DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
+ Node->setNodeId(-1);
+ return nullptr;
+ }
+
+ // Few custom selection stuff.
+ SDNode *ResNode = nullptr;
+ EVT VT = Node->getValueType(0);
+
+ switch (Node->getOpcode()) {
+ default:
+ break;
+ // FIXME: Implement WebAssembly-specific selection.
+ (void)VT;
+ }
+
+ // Select the default instruction.
+ ResNode = SelectCode(Node);
+
+ DEBUG(errs() << "=> ");
+ if (ResNode == nullptr || ResNode == Node)
+ DEBUG(Node->dump(CurDAG));
+ else
+ DEBUG(ResNode->dump(CurDAG));
+ DEBUG(errs() << "\n");
+
+ return ResNode;
}
/// This pass converts a legalized DAG into a WebAssembly-specific DAG, ready