1 //===-- WebAssemblyUtilities.cpp - WebAssembly Utility Functions ----------===//
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 implements several utility functions for WebAssembly.
12 ///
13 //===----------------------------------------------------------------------===//
14 
15 #include "WebAssemblyUtilities.h"
16 #include "WebAssemblyMachineFunctionInfo.h"
17 #include "llvm/CodeGen/MachineInstr.h"
18 using namespace llvm;
19 
20 bool WebAssembly::isArgument(const MachineInstr &MI) {
21   switch (MI.getOpcode()) {
22   case WebAssembly::ARGUMENT_I32:
23   case WebAssembly::ARGUMENT_I64:
24   case WebAssembly::ARGUMENT_F32:
25   case WebAssembly::ARGUMENT_F64:
26   case WebAssembly::ARGUMENT_v16i8:
27   case WebAssembly::ARGUMENT_v8i16:
28   case WebAssembly::ARGUMENT_v4i32:
29   case WebAssembly::ARGUMENT_v4f32:
30     return true;
31   default:
32     return false;
33   }
34 }
35 
36 bool WebAssembly::isCopy(const MachineInstr &MI) {
37   switch (MI.getOpcode()) {
38   case WebAssembly::COPY_I32:
39   case WebAssembly::COPY_I64:
40   case WebAssembly::COPY_F32:
41   case WebAssembly::COPY_F64:
42     return true;
43   default:
44     return false;
45   }
46 }
47 
48 bool WebAssembly::isTee(const MachineInstr &MI) {
49   switch (MI.getOpcode()) {
50   case WebAssembly::TEE_I32:
51   case WebAssembly::TEE_I64:
52   case WebAssembly::TEE_F32:
53   case WebAssembly::TEE_F64:
54     return true;
55   default:
56     return false;
57   }
58 }
59 
60 /// Test whether MI is a child of some other node in an expression tree.
61 bool WebAssembly::isChild(const MachineInstr &MI,
62                           const WebAssemblyFunctionInfo &MFI) {
63   if (MI.getNumOperands() == 0)
64     return false;
65   const MachineOperand &MO = MI.getOperand(0);
66   if (!MO.isReg() || MO.isImplicit() || !MO.isDef())
67     return false;
68   unsigned Reg = MO.getReg();
69   return TargetRegisterInfo::isVirtualRegister(Reg) &&
70          MFI.isVRegStackified(Reg);
71 }
72