forked from OSchip/llvm-project
241 lines
8.4 KiB
C++
241 lines
8.4 KiB
C++
// WebAssemblyMachineFunctionInfo.h-WebAssembly machine function info-*- C++ -*-
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file declares WebAssembly-specific per-machine-function
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/// information.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
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#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "llvm/CodeGen/MIRYamlMapping.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/MC/MCSymbolWasm.h"
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namespace llvm {
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struct WasmEHFuncInfo;
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namespace yaml {
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struct WebAssemblyFunctionInfo;
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}
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/// This class is derived from MachineFunctionInfo and contains private
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/// WebAssembly-specific information for each MachineFunction.
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class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
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const MachineFunction *MF;
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std::vector<MVT> Params;
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std::vector<MVT> Results;
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std::vector<MVT> Locals;
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/// A mapping from CodeGen vreg index to WebAssembly register number.
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std::vector<unsigned> WARegs;
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/// A mapping from CodeGen vreg index to a boolean value indicating whether
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/// the given register is considered to be "stackified", meaning it has been
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/// determined or made to meet the stack requirements:
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/// - single use (per path)
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/// - single def (per path)
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/// - defined and used in LIFO order with other stack registers
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BitVector VRegStackified;
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// A virtual register holding the pointer to the vararg buffer for vararg
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// functions. It is created and set in TLI::LowerFormalArguments and read by
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// TLI::LowerVASTART
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unsigned VarargVreg = -1U;
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// A virtual register holding the base pointer for functions that have
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// overaligned values on the user stack.
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unsigned BasePtrVreg = -1U;
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// A virtual register holding the frame base. This is either FP or SP
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// after it has been replaced by a vreg
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unsigned FrameBaseVreg = -1U;
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// The local holding the frame base. This is either FP or SP
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// after WebAssemblyExplicitLocals
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unsigned FrameBaseLocal = -1U;
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// Function properties.
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bool CFGStackified = false;
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// Catchpad unwind destination info for wasm EH.
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WasmEHFuncInfo *WasmEHInfo = nullptr;
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public:
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explicit WebAssemblyFunctionInfo(MachineFunction &MF_)
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: MF(&MF_), WasmEHInfo(MF_.getWasmEHFuncInfo()) {}
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~WebAssemblyFunctionInfo() override;
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MachineFunctionInfo *
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clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,
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const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB)
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const override;
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const MachineFunction &getMachineFunction() const { return *MF; }
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void initializeBaseYamlFields(const yaml::WebAssemblyFunctionInfo &YamlMFI);
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void addParam(MVT VT) { Params.push_back(VT); }
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const std::vector<MVT> &getParams() const { return Params; }
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void addResult(MVT VT) { Results.push_back(VT); }
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const std::vector<MVT> &getResults() const { return Results; }
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void clearParamsAndResults() {
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Params.clear();
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Results.clear();
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}
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void setNumLocals(size_t NumLocals) { Locals.resize(NumLocals, MVT::i32); }
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void setLocal(size_t i, MVT VT) { Locals[i] = VT; }
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void addLocal(MVT VT) { Locals.push_back(VT); }
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const std::vector<MVT> &getLocals() const { return Locals; }
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unsigned getVarargBufferVreg() const {
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assert(VarargVreg != -1U && "Vararg vreg hasn't been set");
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return VarargVreg;
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}
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void setVarargBufferVreg(unsigned Reg) { VarargVreg = Reg; }
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unsigned getBasePointerVreg() const {
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assert(BasePtrVreg != -1U && "Base ptr vreg hasn't been set");
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return BasePtrVreg;
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}
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void setFrameBaseVreg(unsigned Reg) { FrameBaseVreg = Reg; }
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unsigned getFrameBaseVreg() const {
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assert(FrameBaseVreg != -1U && "Frame base vreg hasn't been set");
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return FrameBaseVreg;
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}
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void clearFrameBaseVreg() { FrameBaseVreg = -1U; }
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// Return true if the frame base physreg has been replaced by a virtual reg.
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bool isFrameBaseVirtual() const { return FrameBaseVreg != -1U; }
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void setFrameBaseLocal(unsigned Local) { FrameBaseLocal = Local; }
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unsigned getFrameBaseLocal() const {
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assert(FrameBaseLocal != -1U && "Frame base local hasn't been set");
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return FrameBaseLocal;
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}
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void setBasePointerVreg(unsigned Reg) { BasePtrVreg = Reg; }
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static const unsigned UnusedReg = -1u;
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void stackifyVReg(MachineRegisterInfo &MRI, unsigned VReg) {
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assert(MRI.getUniqueVRegDef(VReg));
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auto I = Register::virtReg2Index(VReg);
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if (I >= VRegStackified.size())
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VRegStackified.resize(I + 1);
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VRegStackified.set(I);
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}
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void unstackifyVReg(unsigned VReg) {
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auto I = Register::virtReg2Index(VReg);
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if (I < VRegStackified.size())
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VRegStackified.reset(I);
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}
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bool isVRegStackified(unsigned VReg) const {
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auto I = Register::virtReg2Index(VReg);
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if (I >= VRegStackified.size())
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return false;
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return VRegStackified.test(I);
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}
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void initWARegs(MachineRegisterInfo &MRI);
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void setWAReg(unsigned VReg, unsigned WAReg) {
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assert(WAReg != UnusedReg);
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auto I = Register::virtReg2Index(VReg);
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assert(I < WARegs.size());
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WARegs[I] = WAReg;
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}
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unsigned getWAReg(unsigned VReg) const {
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auto I = Register::virtReg2Index(VReg);
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assert(I < WARegs.size());
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return WARegs[I];
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}
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// For a given stackified WAReg, return the id number to print with push/pop.
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static unsigned getWARegStackId(unsigned Reg) {
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assert(Reg & INT32_MIN);
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return Reg & INT32_MAX;
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}
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bool isCFGStackified() const { return CFGStackified; }
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void setCFGStackified(bool Value = true) { CFGStackified = Value; }
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WasmEHFuncInfo *getWasmEHFuncInfo() const { return WasmEHInfo; }
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void setWasmEHFuncInfo(WasmEHFuncInfo *Info) { WasmEHInfo = Info; }
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};
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void computeLegalValueVTs(const WebAssemblyTargetLowering &TLI,
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LLVMContext &Ctx, const DataLayout &DL, Type *Ty,
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SmallVectorImpl<MVT> &ValueVTs);
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void computeLegalValueVTs(const Function &F, const TargetMachine &TM, Type *Ty,
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SmallVectorImpl<MVT> &ValueVTs);
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// Compute the signature for a given FunctionType (Ty). Note that it's not the
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// signature for ContextFunc (ContextFunc is just used to get varous context)
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void computeSignatureVTs(const FunctionType *Ty, const Function *TargetFunc,
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const Function &ContextFunc, const TargetMachine &TM,
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SmallVectorImpl<MVT> &Params,
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SmallVectorImpl<MVT> &Results);
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void valTypesFromMVTs(const ArrayRef<MVT> &In,
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SmallVectorImpl<wasm::ValType> &Out);
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std::unique_ptr<wasm::WasmSignature>
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signatureFromMVTs(const SmallVectorImpl<MVT> &Results,
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const SmallVectorImpl<MVT> &Params);
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namespace yaml {
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using BBNumberMap = DenseMap<int, int>;
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struct WebAssemblyFunctionInfo final : public yaml::MachineFunctionInfo {
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std::vector<FlowStringValue> Params;
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std::vector<FlowStringValue> Results;
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bool CFGStackified = false;
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// The same as WasmEHFuncInfo's SrcToUnwindDest, but stored in the mapping of
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// BB numbers
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BBNumberMap SrcToUnwindDest;
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WebAssemblyFunctionInfo() = default;
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WebAssemblyFunctionInfo(const llvm::WebAssemblyFunctionInfo &MFI);
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void mappingImpl(yaml::IO &YamlIO) override;
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~WebAssemblyFunctionInfo() = default;
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};
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template <> struct MappingTraits<WebAssemblyFunctionInfo> {
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static void mapping(IO &YamlIO, WebAssemblyFunctionInfo &MFI) {
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YamlIO.mapOptional("params", MFI.Params, std::vector<FlowStringValue>());
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YamlIO.mapOptional("results", MFI.Results, std::vector<FlowStringValue>());
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YamlIO.mapOptional("isCFGStackified", MFI.CFGStackified, false);
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YamlIO.mapOptional("wasmEHFuncInfo", MFI.SrcToUnwindDest);
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}
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};
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template <> struct CustomMappingTraits<BBNumberMap> {
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static void inputOne(IO &YamlIO, StringRef Key,
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BBNumberMap &SrcToUnwindDest) {
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YamlIO.mapRequired(Key.str().c_str(),
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SrcToUnwindDest[std::atoi(Key.str().c_str())]);
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}
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static void output(IO &YamlIO, BBNumberMap &SrcToUnwindDest) {
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for (auto KV : SrcToUnwindDest)
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YamlIO.mapRequired(std::to_string(KV.first).c_str(), KV.second);
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}
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};
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} // end namespace yaml
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} // end namespace llvm
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#endif
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