[WebAssembly] Support WebAssemblyFunctionInfo serialization

Summary:
The framework for supporting target-specific MachineFunctionInfo was
added in r356215. This adds serialization support for
WebAssemblyFunctionInfo on top of that. This patch only adds the
framework and does not actually serialize anything at this point; we
have to add YAML mapping later for the fields in WebAssemblyFunctionInfo
we want to serialize if necessary.

Reviewers: dschuff, arsenm

Subscribers: sunfish, wdng, sbc100, jgravelle-google, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59737

llvm-svn: 357009

llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.cpp

@@ -77,3 +77,13 @@ llvm::signatureFromMVTs(const SmallVectorImpl<MVT> &Results,
   valTypesFromMVTs(Params, Sig->Params);
   return Sig;
 }
+
+yaml::WebAssemblyFunctionInfo::WebAssemblyFunctionInfo(
+    const llvm::WebAssemblyFunctionInfo &MFI) {}
+
+void yaml::WebAssemblyFunctionInfo::mappingImpl(yaml::IO &YamlIO) {
+  MappingTraits<WebAssemblyFunctionInfo>::mapping(YamlIO, *this);
+}
+
+void WebAssemblyFunctionInfo::initializeBaseYamlFields(
+    const yaml::WebAssemblyFunctionInfo &YamlMFI) {}

llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h

@@ -17,11 +17,16 @@
 
 #include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
 #include "llvm/BinaryFormat/Wasm.h"
+#include "llvm/CodeGen/MIRYamlMapping.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/MC/MCSymbolWasm.h"
 
 namespace llvm {
 
+namespace yaml {
+struct WebAssemblyFunctionInfo;
+}
+
 /// This class is derived from MachineFunctionInfo and contains private
 /// WebAssembly-specific information for each MachineFunction.
 class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
@@ -54,6 +59,7 @@ class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
 public:
   explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
   ~WebAssemblyFunctionInfo() override;
+  void initializeBaseYamlFields(const yaml::WebAssemblyFunctionInfo &YamlMFI);
 
   void addParam(MVT VT) { Params.push_back(VT); }
   const std::vector<MVT> &getParams() const { return Params; }
@@ -135,6 +141,22 @@ std::unique_ptr<wasm::WasmSignature>
 signatureFromMVTs(const SmallVectorImpl<MVT> &Results,
                   const SmallVectorImpl<MVT> &Params);
 
+namespace yaml {
+
+struct WebAssemblyFunctionInfo final : public yaml::MachineFunctionInfo {
+  WebAssemblyFunctionInfo() = default;
+  WebAssemblyFunctionInfo(const llvm::WebAssemblyFunctionInfo &MFI);
+
+  void mappingImpl(yaml::IO &YamlIO) override;
+  ~WebAssemblyFunctionInfo() = default;
+};
+
+template <> struct MappingTraits<WebAssemblyFunctionInfo> {
+  static void mapping(IO &YamlIO, WebAssemblyFunctionInfo &MFI) {}
+};
+
+} // end namespace yaml
+
 } // end namespace llvm
 
 #endif

llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp

@@ -14,8 +14,10 @@
 #include "WebAssemblyTargetMachine.h"
 #include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
 #include "WebAssembly.h"
+#include "WebAssemblyMachineFunctionInfo.h"
 #include "WebAssemblyTargetObjectFile.h"
 #include "WebAssemblyTargetTransformInfo.h"
+#include "llvm/CodeGen/MIRParser/MIParser.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/RegAllocRegistry.h"
@@ -367,3 +369,24 @@ void WebAssemblyPassConfig::addPreEmitPass() {
   // Create a mapping from LLVM CodeGen virtual registers to wasm registers.
   addPass(createWebAssemblyRegNumbering());
 }
+
+yaml::MachineFunctionInfo *
+WebAssemblyTargetMachine::createDefaultFuncInfoYAML() const {
+  return new yaml::WebAssemblyFunctionInfo();
+}
+
+yaml::MachineFunctionInfo *WebAssemblyTargetMachine::convertFuncInfoToYAML(
+    const MachineFunction &MF) const {
+  const auto *MFI = MF.getInfo<WebAssemblyFunctionInfo>();
+  return new yaml::WebAssemblyFunctionInfo(*MFI);
+}
+
+bool WebAssemblyTargetMachine::parseMachineFunctionInfo(
+    const yaml::MachineFunctionInfo &MFI, PerFunctionMIParsingState &PFS,
+    SMDiagnostic &Error, SMRange &SourceRange) const {
+  const auto &YamlMFI =
+      reinterpret_cast<const yaml::WebAssemblyFunctionInfo &>(MFI);
+  MachineFunction &MF = PFS.MF;
+  MF.getInfo<WebAssemblyFunctionInfo>()->initializeBaseYamlFields(YamlMFI);
+  return false;
+}

llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.h

@@ -51,6 +51,14 @@ public:
   TargetTransformInfo getTargetTransformInfo(const Function &F) override;
 
   bool usesPhysRegsForPEI() const override { return false; }
+
+  yaml::MachineFunctionInfo *createDefaultFuncInfoYAML() const override;
+  yaml::MachineFunctionInfo *
+  convertFuncInfoToYAML(const MachineFunction &MF) const override;
+  bool parseMachineFunctionInfo(const yaml::MachineFunctionInfo &,
+                                PerFunctionMIParsingState &PFS,
+                                SMDiagnostic &Error,
+                                SMRange &SourceRange) const override;
 };
 
 } // end namespace llvm

llvm/test/CodeGen/WebAssembly/function-info.mir

@@ -0,0 +1,11 @@
+# RUN: llc -mtriple=wasm32-unknown-unknown -run-pass wasm-cfg-stackify %s -o - | FileCheck %s
+
+# CHECK-LABEL: function_property_test
+# CHECK: machineFunctionInfo: {}
+name: function_property_test
+liveins:
+  - { reg: '$arguments' }
+body: |
+  bb.0:
+    RETURN_VOID implicit-def dead $arguments
+...