From 779d98e1c008b30a211375a76f3f2c97502a02b5 Mon Sep 17 00:00:00 2001
From: Krzysztof Parzyszek <kparzysz@codeaurora.org>
Date: Thu, 14 Sep 2017 16:56:21 +0000
Subject: TableGen support for parameterized register class information

This replaces TableGen's type inference to operate on parameterized
types instead of MVTs, and as a consequence, some interfaces have
changed:
- Uses of MVTs are replaced by ValueTypeByHwMode.
- EEVT::TypeSet is replaced by TypeSetByHwMode.

This affects the way that types and type sets are printed, and the
tests relying on that have been updated.

There are certain users of the inferred types outside of TableGen
itself, namely FastISel and GlobalISel. For those users, the way
that the types are accessed have changed. For typical scenarios,
these replacements can be used:
- TreePatternNode::getType(ResNo) -> getSimpleType(ResNo)
- TreePatternNode::hasTypeSet(ResNo) -> hasConcreteType(ResNo)
- TypeSet::isConcrete -> TypeSetByHwMode::isValueTypeByHwMode(false)

For more information, please refer to the review page.

Differential Revision: https://reviews.llvm.org/D31951

llvm-svn: 313271
---
 llvm/utils/TableGen/CodeGenHwModes.cpp | 114 +++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 llvm/utils/TableGen/CodeGenHwModes.cpp

(limited to 'llvm/utils/TableGen/CodeGenHwModes.cpp')

diff --git a/llvm/utils/TableGen/CodeGenHwModes.cpp b/llvm/utils/TableGen/CodeGenHwModes.cpp
new file mode 100644
index 00000000000..9f88d95275b
--- /dev/null
+++ b/llvm/utils/TableGen/CodeGenHwModes.cpp
@@ -0,0 +1,114 @@
+//===--- CodeGenHwModes.cpp -----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Classes to parse and store HW mode information for instruction selection
+//===----------------------------------------------------------------------===//
+
+#include "CodeGenHwModes.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/TableGen/Record.h"
+
+using namespace llvm;
+
+StringRef CodeGenHwModes::DefaultModeName = "DefaultMode";
+
+HwMode::HwMode(Record *R) {
+  Name = R->getName();
+  Features = R->getValueAsString("Features");
+}
+
+LLVM_DUMP_METHOD
+void HwMode::dump() const {
+  dbgs() << Name << ": " << Features << '\n';
+}
+
+HwModeSelect::HwModeSelect(Record *R, CodeGenHwModes &CGH) {
+  std::vector<Record*> Modes = R->getValueAsListOfDefs("Modes");
+  std::vector<Record*> Objects = R->getValueAsListOfDefs("Objects");
+  if (Modes.size() != Objects.size()) {
+    PrintError(R->getLoc(), "in record " + R->getName() +
+        " derived from HwModeSelect: the lists Modes and Objects should "
+        "have the same size");
+    report_fatal_error("error in target description.");
+  }
+  for (unsigned i = 0, e = Modes.size(); i != e; ++i) {
+    unsigned ModeId = CGH.getHwModeId(Modes[i]->getName());
+    Items.push_back(std::make_pair(ModeId, Objects[i]));
+  }
+}
+
+LLVM_DUMP_METHOD
+void HwModeSelect::dump() const {
+  dbgs() << '{';
+  for (const PairType &P : Items)
+    dbgs() << " (" << P.first << ',' << P.second->getName() << ')';
+  dbgs() << " }\n";
+}
+
+CodeGenHwModes::CodeGenHwModes(RecordKeeper &RK) : Records(RK) {
+  std::vector<Record*> MRs = Records.getAllDerivedDefinitions("HwMode");
+  // The default mode needs a definition in the .td sources for TableGen
+  // to accept references to it. We need to ignore the definition here.
+  for (auto I = MRs.begin(), E = MRs.end(); I != E; ++I) {
+    if ((*I)->getName() != DefaultModeName)
+      continue;
+    MRs.erase(I);
+    break;
+  }
+
+  for (Record *R : MRs) {
+    Modes.emplace_back(R);
+    unsigned NewId = Modes.size();
+    ModeIds.insert(std::make_pair(Modes[NewId-1].Name, NewId));
+  }
+
+  std::vector<Record*> MSs = Records.getAllDerivedDefinitions("HwModeSelect");
+  for (Record *R : MSs) {
+    auto P = ModeSelects.emplace(std::make_pair(R, HwModeSelect(R, *this)));
+    assert(P.second);
+    (void)P;
+  }
+}
+
+unsigned CodeGenHwModes::getHwModeId(StringRef Name) const {
+  if (Name == DefaultModeName)
+    return DefaultMode;
+  auto F = ModeIds.find(Name);
+  assert(F != ModeIds.end() && "Unknown mode name");
+  return F->second;
+}
+
+const HwModeSelect &CodeGenHwModes::getHwModeSelect(Record *R) const {
+  auto F = ModeSelects.find(R);
+  assert(F != ModeSelects.end() && "Record is not a \"mode select\"");
+  return F->second;
+}
+
+LLVM_DUMP_METHOD
+void CodeGenHwModes::dump() const {
+  dbgs() << "Modes: {\n";
+  for (const HwMode &M : Modes) {
+    dbgs() << "  ";
+    M.dump();
+  }
+  dbgs() << "}\n";
+
+  dbgs() << "ModeIds: {\n";
+  for (const auto &P : ModeIds)
+    dbgs() << "  " << P.first() << " -> " << P.second << '\n';
+  dbgs() << "}\n";
+
+  dbgs() << "ModeSelects: {\n";
+  for (const auto &P : ModeSelects) {
+    dbgs() << "  " << P.first->getName() << " -> ";
+    P.second.dump();
+  }
+  dbgs() << "}\n";
+}
-- 
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