1//===-- WebAssemblyFastISel.cpp - WebAssembly FastISel implementation -----===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9///
10/// \file
11/// \brief This file defines the WebAssembly-specific support for the FastISel
12/// class. Some of the target-specific code is generated by tablegen in the file
13/// WebAssemblyGenFastISel.inc, which is #included here.
14///
15//===----------------------------------------------------------------------===//
16
17#include "WebAssembly.h"
18#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
19#include "WebAssemblySubtarget.h"
20#include "WebAssemblyTargetMachine.h"
21#include "llvm/Analysis/BranchProbabilityInfo.h"
22#include "llvm/CodeGen/FastISel.h"
23#include "llvm/CodeGen/FunctionLoweringInfo.h"
24#include "llvm/CodeGen/MachineConstantPool.h"
25#include "llvm/CodeGen/MachineFrameInfo.h"
26#include "llvm/CodeGen/MachineInstrBuilder.h"
27#include "llvm/CodeGen/MachineRegisterInfo.h"
28#include "llvm/IR/DataLayout.h"
29#include "llvm/IR/DerivedTypes.h"
30#include "llvm/IR/Function.h"
31#include "llvm/IR/GetElementPtrTypeIterator.h"
32#include "llvm/IR/GlobalAlias.h"
33#include "llvm/IR/GlobalVariable.h"
34#include "llvm/IR/Instructions.h"
35#include "llvm/IR/IntrinsicInst.h"
36#include "llvm/IR/Operator.h"
37using namespace llvm;
38
39#define DEBUG_TYPE "wasm-fastisel"
40
41namespace {
42
43class WebAssemblyFastISel final : public FastISel {
44  /// Keep a pointer to the WebAssemblySubtarget around so that we can make the
45  /// right decision when generating code for different targets.
46  const WebAssemblySubtarget *Subtarget;
47  LLVMContext *Context;
48
49  // Call handling routines.
50private:
51public:
52  // Backend specific FastISel code.
53  WebAssemblyFastISel(FunctionLoweringInfo &FuncInfo,
54                      const TargetLibraryInfo *LibInfo)
55      : FastISel(FuncInfo, LibInfo, /*SkipTargetIndependentISel=*/true) {
56    Subtarget = &FuncInfo.MF->getSubtarget<WebAssemblySubtarget>();
57    Context = &FuncInfo.Fn->getContext();
58  }
59
60  bool fastSelectInstruction(const Instruction *I) override;
61
62#include "WebAssemblyGenFastISel.inc"
63};
64
65} // end anonymous namespace
66
67bool WebAssemblyFastISel::fastSelectInstruction(const Instruction *I) {
68  switch (I->getOpcode()) {
69  default:
70    break;
71    // TODO: add fast-isel selection cases here...
72  }
73
74  // Fall back to target-independent instruction selection.
75  return selectOperator(I, I->getOpcode());
76}
77
78FastISel *WebAssembly::createFastISel(FunctionLoweringInfo &FuncInfo,
79                                      const TargetLibraryInfo *LibInfo) {
80  return new WebAssemblyFastISel(FuncInfo, LibInfo);
81}
82