commit 932618bbd74a0732de8687d0f5a25be8145e90b7
author David Greene <greened@obbligato.org> Mon Oct 27 21:56:29 2008 +0000
committer David Greene <greened@obbligato.org> Mon Oct 27 21:56:29 2008 +0000
tree 5df349b3bbb9c33edd4a4b5a52f2ca8f74d8fc5f
parent 93128beb6a98403fd7cb7da319110b8959aa3b8c

Have TableGen emit setSubgraphColor calls under control of a -gen-debug
flag.  Then in a debugger developers can set breakpoints at these calls
to see waht is about to be selected and what the resulting subgraph
looks like.  This really helps when debugging instruction selection.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58278 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/DAGISelEmitter.cpp

diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index 2996129..82d4148 100644
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -14,13 +14,21 @@
 #include "DAGISelEmitter.h"
 #include "Record.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/Streams.h"
 #include <algorithm>
 #include <deque>
 using namespace llvm;
 
+namespace {
+  cl::opt<bool>
+  GenDebug("gen-debug", cl::desc("Generate debug code"),
+              cl::init(false));
+}
+
 //===----------------------------------------------------------------------===//
 // DAGISelEmitter Helper methods
 //
@@ -969,6 +977,10 @@
         emitCode("InChains.push_back(" + ChainName + ");");
         emitCode(ChainName + " = CurDAG->getNode(ISD::TokenFactor, MVT::Other, "
                  "&InChains[0], InChains.size());");
+        if (GenDebug) {
+          emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"yellow\");");
+          emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"black\");");
+        }
       }
 
       // Loop over all of the operands of the instruction pattern, emitting code
@@ -1096,13 +1108,18 @@
       if (II.isSimpleLoad | II.mayLoad | II.mayStore) {
         std::vector<std::string>::const_iterator mi, mie;
         for (mi = LSI.begin(), mie = LSI.end(); mi != mie; ++mi) {
-          emitCode("SDValue LSI_" + *mi + " = "
+          std::string LSIName = "LSI_" + *mi;
+          emitCode("SDValue " + LSIName + " = "
                    "CurDAG->getMemOperand(cast<MemSDNode>(" +
                    *mi + ")->getMemOperand());");
+          if (GenDebug) {
+            emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"yellow\");");
+            emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"black\");");
+          }
           if (IsVariadic)
-            emitCode("Ops" + utostr(OpsNo) + ".push_back(LSI_" + *mi + ");");
+            emitCode("Ops" + utostr(OpsNo) + ".push_back(" + LSIName + ");");
           else
-            AllOps.push_back("LSI_" + *mi);
+            AllOps.push_back(LSIName);
         }
       }
 
@@ -1269,6 +1286,18 @@
       }
 
       emitCode(CodePrefix + Code + ");");
+
+      if (GenDebug) {
+        if (!isRoot) {
+          emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"yellow\");");
+          emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"black\");");
+        }
+        else {
+          emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"yellow\");");
+          emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"black\");");
+        }
+      }
+
       for (unsigned i = 0, e = After.size(); i != e; ++i)
         emitCode(After[i]);
 
@@ -1766,8 +1795,19 @@
 
         // Replace the emission code within selection routines with calls to the
         // emission functions.
-        CallerCode = "return Emit_" + utostr(EmitFuncNum) + CallerCode;
-        GeneratedCode.push_back(std::make_pair(false, CallerCode));
+        if (GenDebug) {
+          GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"red\");"));
+        }
+        CallerCode = "SDNode *Result = Emit_" + utostr(EmitFuncNum) + CallerCode;
+        GeneratedCode.push_back(std::make_pair(3, CallerCode));
+        if (GenDebug) {
+          GeneratedCode.push_back(std::make_pair(0, "if(Result) {"));
+          GeneratedCode.push_back(std::make_pair(0, "  CurDAG->setSubgraphColor(Result, \"yellow\");"));
+          GeneratedCode.push_back(std::make_pair(0, "  CurDAG->setSubgraphColor(Result, \"black\");"));
+          GeneratedCode.push_back(std::make_pair(0, "}"));
+          //GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"black\");"));
+        }
+        GeneratedCode.push_back(std::make_pair(0, "return Result;"));
       }
 
       // Print function.