1 //===--- CodeGenHwModes.cpp -----------------------------------------------===//
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 // Classes to parse and store HW mode information for instruction selection
10 //===----------------------------------------------------------------------===//
11 
12 #include "CodeGenHwModes.h"
13 #include "llvm/Support/Debug.h"
14 #include "llvm/Support/raw_ostream.h"
15 #include "llvm/TableGen/Error.h"
16 #include "llvm/TableGen/Record.h"
17 
18 using namespace llvm;
19 
20 StringRef CodeGenHwModes::DefaultModeName = "DefaultMode";
21 
22 HwMode::HwMode(Record *R) {
23   Name = R->getName();
24   Features = R->getValueAsString("Features");
25 }
26 
27 LLVM_DUMP_METHOD
28 void HwMode::dump() const {
29   dbgs() << Name << ": " << Features << '\n';
30 }
31 
32 HwModeSelect::HwModeSelect(Record *R, CodeGenHwModes &CGH) {
33   std::vector<Record*> Modes = R->getValueAsListOfDefs("Modes");
34   std::vector<Record*> Objects = R->getValueAsListOfDefs("Objects");
35   if (Modes.size() != Objects.size()) {
36     PrintError(R->getLoc(), "in record " + R->getName() +
37         " derived from HwModeSelect: the lists Modes and Objects should "
38         "have the same size");
39     report_fatal_error("error in target description.");
40   }
41   for (unsigned i = 0, e = Modes.size(); i != e; ++i) {
42     unsigned ModeId = CGH.getHwModeId(Modes[i]->getName());
43     Items.push_back(std::make_pair(ModeId, Objects[i]));
44   }
45 }
46 
47 LLVM_DUMP_METHOD
48 void HwModeSelect::dump() const {
49   dbgs() << '{';
50   for (const PairType &P : Items)
51     dbgs() << " (" << P.first << ',' << P.second->getName() << ')';
52   dbgs() << " }\n";
53 }
54 
55 CodeGenHwModes::CodeGenHwModes(RecordKeeper &RK) : Records(RK) {
56   std::vector<Record*> MRs = Records.getAllDerivedDefinitions("HwMode");
57   // The default mode needs a definition in the .td sources for TableGen
58   // to accept references to it. We need to ignore the definition here.
59   for (auto I = MRs.begin(), E = MRs.end(); I != E; ++I) {
60     if ((*I)->getName() != DefaultModeName)
61       continue;
62     MRs.erase(I);
63     break;
64   }
65 
66   for (Record *R : MRs) {
67     Modes.emplace_back(R);
68     unsigned NewId = Modes.size();
69     ModeIds.insert(std::make_pair(Modes[NewId-1].Name, NewId));
70   }
71 
72   std::vector<Record*> MSs = Records.getAllDerivedDefinitions("HwModeSelect");
73   for (Record *R : MSs) {
74     auto P = ModeSelects.emplace(std::make_pair(R, HwModeSelect(R, *this)));
75     assert(P.second);
76     (void)P;
77   }
78 }
79 
80 unsigned CodeGenHwModes::getHwModeId(StringRef Name) const {
81   if (Name == DefaultModeName)
82     return DefaultMode;
83   auto F = ModeIds.find(Name);
84   assert(F != ModeIds.end() && "Unknown mode name");
85   return F->second;
86 }
87 
88 const HwModeSelect &CodeGenHwModes::getHwModeSelect(Record *R) const {
89   auto F = ModeSelects.find(R);
90   assert(F != ModeSelects.end() && "Record is not a \"mode select\"");
91   return F->second;
92 }
93 
94 LLVM_DUMP_METHOD
95 void CodeGenHwModes::dump() const {
96   dbgs() << "Modes: {\n";
97   for (const HwMode &M : Modes) {
98     dbgs() << "  ";
99     M.dump();
100   }
101   dbgs() << "}\n";
102 
103   dbgs() << "ModeIds: {\n";
104   for (const auto &P : ModeIds)
105     dbgs() << "  " << P.first() << " -> " << P.second << '\n';
106   dbgs() << "}\n";
107 
108   dbgs() << "ModeSelects: {\n";
109   for (const auto &P : ModeSelects) {
110     dbgs() << "  " << P.first->getName() << " -> ";
111     P.second.dump();
112   }
113   dbgs() << "}\n";
114 }
115