Initial skeleton of Subzero.

src/IceCfg.cpp

+//===- subzero/src/IceCfg.cpp - Control flow graph implementation ---------===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the IceCfg class, including constant pool
+// management.
+//
+//===----------------------------------------------------------------------===//
+
+#include "IceCfg.h"
+#include "IceCfgNode.h"
+#include "IceDefs.h"
+#include "IceInst.h"
+#include "IceOperand.h"
+
+namespace Ice {
+
+IceCfg::IceCfg(GlobalContext *Ctx)
+    : Ctx(Ctx), FunctionName(""), ReturnType(IceType_void),
+      IsInternalLinkage(false), HasError(false), ErrorMessage(""), Entry(NULL),
+      NextInstNumber(1), CurrentNode(NULL) {}
+
+IceCfg::~IceCfg() {}
+
+void IceCfg::setError(const IceString &Message) {
+  HasError = true;
+  ErrorMessage = Message;
+  Ctx->getStrDump() << "ICE translation error: " << ErrorMessage << "\n";
+}
+
+CfgNode *IceCfg::makeNode(const IceString &Name) {
+  IceSize_t LabelIndex = Nodes.size();
+  CfgNode *Node = CfgNode::create(this, LabelIndex, Name);
+  Nodes.push_back(Node);
+  return Node;
+}
+
+// Create a new Variable with a particular type and an optional
+// name.  The Node argument is the node where the variable is defined.

[JF, 2014/04/23 03:51:28]

Silly comment... Two spaces after a period? You know the code review is winding
down at this point ;-)

[Jim Stichnoth, 2014/04/26 15:02:11]

Two spaces is how I always write prose... maybe file a clang-format bug? :)

+Variable *IceCfg::makeVariable(IceType Type, const CfgNode *Node,
+                               const IceString &Name) {
+  IceSize_t Index = Variables.size();
+  Variables.push_back(Variable::create(this, Type, Node, Index, Name));
+  return Variables[Index];
+}
+
+void IceCfg::addArg(Variable *Arg) {
+  Arg->setIsArg(this);
+  Args.push_back(Arg);
+}
+
+void IceCfg::computePredecessors() {
+  for (NodeList::iterator I = Nodes.begin(), E = Nodes.end(); I != E; ++I) {
+    (*I)->computePredecessors();
+  }
+}
+
+// ======================== Dump routines ======================== //
+
+void IceCfg::dump() {
+  IceOstream &Str = Ctx->getStrDump();
+  setCurrentNode(getEntryNode());
+  // Print function name+args
+  if (getContext()->isVerbose(IceV_Instructions)) {
+    Str << "define ";
+    if (getInternal())
+      Str << "internal ";
+    Str << ReturnType << " @" << getFunctionName() << "(";
+    for (IceSize_t i = 0; i < Args.size(); ++i) {
+      if (i > 0)
+        Str << ", ";
+      Str << Args[i]->getType() << " ";
+      Args[i]->dump(this);
+    }
+    Str << ") {\n";
+  }
+  setCurrentNode(NULL);
+  // Print each basic block
+  for (NodeList::const_iterator I = Nodes.begin(), E = Nodes.end(); I != E;
+       ++I) {
+    (*I)->dump(this);
+  }
+  if (getContext()->isVerbose(IceV_Instructions)) {
+    Str << "}\n";
+  }
+}
+
+} // end of namespace Ice