LLVM 18.0.0git
BPFTargetMachine.cpp
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1//===-- BPFTargetMachine.cpp - Define TargetMachine for BPF ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// Implements the info about BPF target spec.
10//
11//===----------------------------------------------------------------------===//
12
13#include "BPFTargetMachine.h"
14#include "BPF.h"
18#include "llvm/CodeGen/Passes.h"
21#include "llvm/IR/PassManager.h"
29#include <optional>
30using namespace llvm;
31
32static cl::
33opt<bool> DisableMIPeephole("disable-bpf-peephole", cl::Hidden,
34 cl::desc("Disable machine peepholes for BPF"));
35
37 // Register the target.
41
46}
47
48// DataLayout: little or big endian
49static std::string computeDataLayout(const Triple &TT) {
50 if (TT.getArch() == Triple::bpfeb)
51 return "E-m:e-p:64:64-i64:64-i128:128-n32:64-S128";
52 else
53 return "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128";
54}
55
56static Reloc::Model getEffectiveRelocModel(std::optional<Reloc::Model> RM) {
57 return RM.value_or(Reloc::PIC_);
58}
59
61 StringRef CPU, StringRef FS,
63 std::optional<Reloc::Model> RM,
64 std::optional<CodeModel::Model> CM,
65 CodeGenOptLevel OL, bool JIT)
66 : LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options,
68 getEffectiveCodeModel(CM, CodeModel::Small), OL),
69 TLOF(std::make_unique<TargetLoweringObjectFileELF>()),
70 Subtarget(TT, std::string(CPU), std::string(FS), *this) {
72
73 BPFMCAsmInfo *MAI =
74 static_cast<BPFMCAsmInfo *>(const_cast<MCAsmInfo *>(AsmInfo.get()));
76}
77
78namespace {
79// BPF Code Generator Pass Configuration Options.
80class BPFPassConfig : public TargetPassConfig {
81public:
82 BPFPassConfig(BPFTargetMachine &TM, PassManagerBase &PM)
83 : TargetPassConfig(TM, PM) {}
84
85 BPFTargetMachine &getBPFTargetMachine() const {
86 return getTM<BPFTargetMachine>();
87 }
88
89 void addIRPasses() override;
90 bool addInstSelector() override;
91 void addMachineSSAOptimization() override;
92 void addPreEmitPass() override;
93};
94}
95
97 return new BPFPassConfig(*this, PM);
98}
99
104 if (PassName == "bpf-ir-peephole") {
106 return true;
107 }
108 return false;
109 });
117 });
119 OptimizationLevel Level) {
120 FPM.addPass(SimplifyCFGPass(SimplifyCFGOptions().hoistCommonInsts(true)));
121 });
125 });
126}
127
128void BPFPassConfig::addIRPasses() {
129 addPass(createBPFCheckAndAdjustIR());
131}
132
135 return TargetTransformInfo(BPFTTIImpl(this, F));
136}
137
138// Install an instruction selector pass using
139// the ISelDag to gen BPF code.
140bool BPFPassConfig::addInstSelector() {
141 addPass(createBPFISelDag(getBPFTargetMachine()));
142
143 return false;
144}
145
146void BPFPassConfig::addMachineSSAOptimization() {
148
149 // The default implementation must be called first as we want eBPF
150 // Peephole ran at last.
152
153 const BPFSubtarget *Subtarget = getBPFTargetMachine().getSubtargetImpl();
154 if (!DisableMIPeephole) {
155 if (Subtarget->getHasAlu32())
156 addPass(createBPFMIPeepholePass());
157 }
158}
159
160void BPFPassConfig::addPreEmitPass() {
162 if (getOptLevel() != CodeGenOptLevel::None)
165}
LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFTarget()
static Reloc::Model getEffectiveRelocModel(std::optional< Reloc::Model > RM)
static cl::opt< bool > DisableMIPeephole("disable-bpf-peephole", cl::Hidden, cl::desc("Disable machine peepholes for BPF"))
#define LLVM_EXTERNAL_VISIBILITY
Definition: Compiler.h:135
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
static LVOptions Options
Definition: LVOptions.cpp:25
static std::string computeDataLayout()
#define F(x, y, z)
Definition: MD5.cpp:55
static GCMetadataPrinterRegistry::Add< OcamlGCMetadataPrinter > Y("ocaml", "ocaml 3.10-compatible collector")
ModulePassManager MPM
const char LLVMTargetMachineRef TM
PassBuilder PB(Machine, PassOpts->PTO, std::nullopt, &PIC)
This header defines various interfaces for pass management in LLVM.
This file provides the interface for the pass responsible for both simplifying and canonicalizing the...
Target-Independent Code Generator Pass Configuration Options pass.
static const char PassName[]
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory),...
Definition: ArrayRef.h:41
void setDwarfUsesRelocationsAcrossSections(bool enable)
Definition: BPFMCAsmInfo.h:46
bool getUseDwarfRIS() const
Definition: BPFSubtarget.h:76
bool getHasAlu32() const
Definition: BPFSubtarget.h:75
TargetPassConfig * createPassConfig(PassManagerBase &PM) override
Create a pass configuration object to be used by addPassToEmitX methods for generating a pipeline of ...
void registerPassBuilderCallbacks(PassBuilder &PB) override
Allow the target to modify the pass pipeline.
BPFTargetMachine(const Target &T, const Triple &TT, StringRef CPU, StringRef FS, const TargetOptions &Options, std::optional< Reloc::Model > RM, std::optional< CodeModel::Model > CM, CodeGenOptLevel OL, bool JIT)
TargetTransformInfo getTargetTransformInfo(const Function &F) const override
Get a TargetTransformInfo implementation for the target.
This class describes a target machine that is implemented with the LLVM target-independent code gener...
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
This class provides access to building LLVM's passes.
Definition: PassBuilder.h:103
void registerPipelineEarlySimplificationEPCallback(const std::function< void(ModulePassManager &, OptimizationLevel)> &C)
Register a callback for a default optimizer pipeline extension point.
Definition: PassBuilder.h:457
void registerPipelineStartEPCallback(const std::function< void(ModulePassManager &, OptimizationLevel)> &C)
Register a callback for a default optimizer pipeline extension point.
Definition: PassBuilder.h:448
void registerPeepholeEPCallback(const std::function< void(FunctionPassManager &, OptimizationLevel)> &C)
Register a callback for a default optimizer pipeline extension point.
Definition: PassBuilder.h:382
void registerPipelineParsingCallback(const std::function< bool(StringRef Name, CGSCCPassManager &, ArrayRef< PipelineElement >)> &C)
{{@ Register pipeline parsing callbacks with this pass builder instance.
Definition: PassBuilder.h:530
LLVM_ATTRIBUTE_MINSIZE std::enable_if_t<!std::is_same< PassT, PassManager >::value > addPass(PassT &&Pass)
Definition: PassManager.h:573
PassRegistry - This class manages the registration and intitialization of the pass subsystem as appli...
Definition: PassRegistry.h:37
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
A pass to simplify and canonicalize the CFG of a function.
Definition: SimplifyCFG.h:29
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
std::unique_ptr< const MCAsmInfo > AsmInfo
Contains target specific asm information.
Target-Independent Code Generator Pass Configuration Options.
virtual void addIRPasses()
Add common target configurable passes that perform LLVM IR to IR transforms following machine indepen...
virtual void addMachineSSAOptimization()
addMachineSSAOptimization - Add standard passes that optimize machine instructions in SSA form.
This pass provides access to the codegen interfaces that are needed for IR-level transformations.
Target - Wrapper for Target specific information.
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
PassManagerBase - An abstract interface to allow code to add passes to a pass manager without having ...
Interfaces for registering analysis passes, producing common pass manager configurations,...
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
FunctionPass * createBPFMISimplifyPatchablePass()
ModuleToFunctionPassAdaptor createModuleToFunctionPassAdaptor(FunctionPassT &&Pass, bool EagerlyInvalidate=false)
A function to deduce a function pass type and wrap it in the templated adaptor.
Definition: PassManager.h:1247
FunctionPass * createBPFMIPreEmitCheckingPass()
Target & getTheBPFleTarget()
ModulePass * createBPFCheckAndAdjustIR()
FunctionPass * createBPFMIPreEmitPeepholePass()
void initializeBPFMIPeepholePass(PassRegistry &)
FunctionPass * createBPFMIPeepholePass()
CodeModel::Model getEffectiveCodeModel(std::optional< CodeModel::Model > CM, CodeModel::Model Default)
Helper method for getting the code model, returning Default if CM does not have a value.
Target & getTheBPFbeTarget()
Target & getTheBPFTarget()
CodeGenOptLevel
Code generation optimization level.
Definition: CodeGen.h:54
void initializeBPFCheckAndAdjustIRPass(PassRegistry &)
FunctionPass * createBPFISelDag(BPFTargetMachine &TM)
void initializeBPFDAGToDAGISelPass(PassRegistry &)
Implement std::hash so that hash_code can be used in STL containers.
Definition: BitVector.h:858
RegisterTargetMachine - Helper template for registering a target machine implementation,...