Reapply 50867: A small refactoring (extract method) + some comment fixes.

Fixed the build breakage, sorry for that.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50895 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 64 insertions, 54 deletions

diff --git a/utils/TableGen/LLVMCConfigurationEmitter.cpp b/utils/TableGen/LLVMCConfigurationEmitter.cpp
index d126e990af..1947aa5bef 100644
--- a/utils/TableGen/LLVMCConfigurationEmitter.cpp
+++ b/utils/TableGen/LLVMCConfigurationEmitter.cpp
@@ -163,8 +163,8 @@ struct GlobalOptionDescription : public OptionDescription {
   std::string Help;
   unsigned Flags;
 
-  // We need t provide a default constructor since
-  // StringMap can only store DefaultConstructible objects
+  // We need to provide a default constructor because
+  // StringMap can only store DefaultConstructible objects.
   GlobalOptionDescription() : OptionDescription(), Flags(0)
   {}
 
@@ -222,9 +222,9 @@ struct GlobalOptionDescriptions {
 };
 
 
-// Tool-local option description
+// Tool-local option description.
 
-// Properties without arguments are implemented as flags
+// Properties without arguments are implemented as flags.
 namespace ToolOptionDescriptionFlags {
   enum ToolOptionDescriptionFlags { StopCompilation = 0x1,
                                     Forward = 0x2, UnpackValues = 0x4};
@@ -314,7 +314,7 @@ typedef std::vector<IntrusiveRefCntPtr<ToolProperties> > ToolPropertiesList;
 
 
 /// CollectProperties - Function object for iterating over a list of
-/// tool property records
+/// tool property records.
 class CollectProperties {
 private:
 
@@ -569,7 +569,8 @@ bool CollectProperties::staticMembersInitialized_ = false;
 
 
 /// CollectToolProperties - Gather information from the parsed
-/// TableGen data (basically a wrapper for CollectProperties).
+/// TableGen data (basically a wrapper for the CollectProperties
+/// function object).
 void CollectToolProperties (RecordVector::const_iterator B,
                             RecordVector::const_iterator E,
                             ToolPropertiesList& TPList,
@@ -589,12 +590,50 @@ void CollectToolProperties (RecordVector::const_iterator B,
   }
 }
 
-/// EmitOptionPropertyHandlingCode - Used by EmitGenerateActionMethod.
+/// EmitForwardOptionPropertyHandlingCode - Helper function used to
+/// implement EmitOptionPropertyHandlingCode(). Emits code for
+/// handling the (forward) option property.
+void EmitForwardOptionPropertyHandlingCode (const ToolOptionDescription& D,
+                                            std::ostream& O) {
+  switch (D.Type) {
+  case OptionType::Switch:
+    O << Indent3 << "vec.push_back(\"-" << D.Name << "\");\n";
+    break;
+  case OptionType::Parameter:
+    O << Indent3 << "vec.push_back(\"-" << D.Name << "\");\n";
+    O << Indent3 << "vec.push_back(" << D.GenVariableName() << ");\n";
+    break;
+  case OptionType::Prefix:
+    O << Indent3 << "vec.push_back(\"-" << D.Name << "\" + "
+      << D.GenVariableName() << ");\n";
+    break;
+  case OptionType::PrefixList:
+    O << Indent3 << "for (" << D.GenTypeDeclaration()
+      << "::iterator B = " << D.GenVariableName() << ".begin(),\n"
+      << Indent3 << "E = " << D.GenVariableName() << ".end(); B != E; ++B)\n"
+      << Indent4 << "vec.push_back(\"-" << D.Name << "\" + "
+      << "*B);\n";
+    break;
+  case OptionType::ParameterList:
+    O << Indent3 << "for (" << D.GenTypeDeclaration()
+      << "::iterator B = " << D.GenVariableName() << ".begin(),\n"
+      << Indent3 << "E = " << D.GenVariableName()
+      << ".end() ; B != E; ++B) {\n"
+      << Indent4 << "vec.push_back(\"-" << D.Name << "\");\n"
+      << Indent4 << "vec.push_back(*B);\n"
+      << Indent3 << "}\n";
+    break;
+  }
+}
+
+/// EmitOptionPropertyHandlingCode - Helper function used by
+/// EmitGenerateActionMethod(). Emits code that handles option
+/// properties.
 void EmitOptionPropertyHandlingCode (const ToolProperties& P,
                                      const ToolOptionDescription& D,
                                      std::ostream& O)
 {
-  // if clause
+  // Start of the if-clause.
   O << Indent2 << "if (";
   if (D.Type == OptionType::Switch)
     O << D.GenVariableName();
@@ -603,7 +642,7 @@ void EmitOptionPropertyHandlingCode (const ToolProperties& P,
 
   O <<") {\n";
 
-  // Handle option properties that take an argument
+  // Handle option properties that take an argument.
   for (OptionPropertyList::const_iterator B = D.Props.begin(),
         E = D.Props.end(); B!=E; ++B) {
     const OptionProperty& val = *B;
@@ -622,37 +661,8 @@ void EmitOptionPropertyHandlingCode (const ToolProperties& P,
   // Handle flags
 
   // (forward) property
-  if (D.isForward()) {
-    switch (D.Type) {
-    case OptionType::Switch:
-      O << Indent3 << "vec.push_back(\"-" << D.Name << "\");\n";
-      break;
-    case OptionType::Parameter:
-      O << Indent3 << "vec.push_back(\"-" << D.Name << "\");\n";
-      O << Indent3 << "vec.push_back(" << D.GenVariableName() << ");\n";
-      break;
-    case OptionType::Prefix:
-      O << Indent3 << "vec.push_back(\"-" << D.Name << "\" + "
-        << D.GenVariableName() << ");\n";
-      break;
-    case OptionType::PrefixList:
-      O << Indent3 << "for (" << D.GenTypeDeclaration()
-        << "::iterator B = " << D.GenVariableName() << ".begin(),\n"
-        << Indent3 << "E = " << D.GenVariableName() << ".end(); B != E; ++B)\n"
-        << Indent4 << "vec.push_back(\"-" << D.Name << "\" + "
-        << "*B);\n";
-      break;
-    case OptionType::ParameterList:
-      O << Indent3 << "for (" << D.GenTypeDeclaration()
-        << "::iterator B = " << D.GenVariableName() << ".begin(),\n"
-        << Indent3 << "E = " << D.GenVariableName()
-        << ".end() ; B != E; ++B) {\n"
-        << Indent4 << "vec.push_back(\"-" << D.Name << "\");\n"
-        << Indent4 << "vec.push_back(*B);\n"
-        << Indent3 << "}\n";
-      break;
-    }
-  }
+  if (D.isForward())
+    EmitForwardOptionPropertyHandlingCode(D, O);
 
   // (unpack_values) property
   if (D.isUnpackValues()) {
@@ -673,16 +683,15 @@ void EmitOptionPropertyHandlingCode (const ToolProperties& P,
     }
   }
 
-  // close if clause
+  // End of the if-clause.
   O << Indent2 << "}\n";
 }
 
-// EmitGenerateActionMethod - Emit one of two versions of
-// GenerateAction method.
-void EmitGenerateActionMethod (const ToolProperties& P, int V, std::ostream& O)
+// EmitGenerateActionMethod - Emit one of two versions of the
+// Tool::GenerateAction() method.
+void EmitGenerateActionMethod (const ToolProperties& P, bool V, std::ostream& O)
 {
-  assert(V==1 || V==2);
-  if (V==1)
+  if (V)
     O << Indent1 << "Action GenerateAction(const PathVector& inFiles,\n";
   else
     O << Indent1 << "Action GenerateAction(const sys::Path& inFile,\n";
@@ -701,7 +710,7 @@ void EmitGenerateActionMethod (const ToolProperties& P, int V, std::ostream& O)
     const std::string& cmd = *I;
     O << Indent2;
     if (cmd == "$INFILE") {
-      if (V==1)
+      if (V)
         O << "for (PathVector::const_iterator B = inFiles.begin()"
           << ", E = inFiles.end();\n"
           << Indent2 << "B != E; ++B)\n"
@@ -717,14 +726,14 @@ void EmitGenerateActionMethod (const ToolProperties& P, int V, std::ostream& O)
     }
   }
 
-  // For every understood option, emit handling code
+  // For every understood option, emit handling code.
   for (ToolOptionDescriptions::const_iterator B = P.OptDescs.begin(),
         E = P.OptDescs.end(); B != E; ++B) {
     const ToolOptionDescription& val = B->second;
     EmitOptionPropertyHandlingCode(P, val, O);
   }
 
-  // Handle Sink property
+  // Handle the Sink property.
   if (P.isSink()) {
     O << Indent2 << "if (!" << SinkOptionName << ".empty()) {\n"
       << Indent3 << "vec.insert(vec.end(), "
@@ -736,8 +745,8 @@ void EmitGenerateActionMethod (const ToolProperties& P, int V, std::ostream& O)
     << Indent1 << "}\n\n";
 }
 
-/// EmitGenerateActionMethods - Emit two GenerateAction methods for a given
-/// Tool class.
+/// EmitGenerateActionMethods - Emit two GenerateAction() methods for
+/// a given Tool class.
 void EmitGenerateActionMethods (const ToolProperties& P, std::ostream& O) {
 
   if (!P.isJoin())
@@ -748,12 +757,13 @@ void EmitGenerateActionMethods (const ToolProperties& P, std::ostream& O) {
       << " is not a Join tool!\");\n"
       << Indent1 << "}\n\n";
   else
-    EmitGenerateActionMethod(P, 1, O);
+    EmitGenerateActionMethod(P, true, O);
 
-  EmitGenerateActionMethod(P, 2, O);
+  EmitGenerateActionMethod(P, false, O);
 }
 
-/// EmitIsLastMethod - Emit IsLast() method for a given Tool class
+/// EmitIsLastMethod - Emit the IsLast() method for a given Tool
+/// class.
 void EmitIsLastMethod (const ToolProperties& P, std::ostream& O) {
   O << Indent1 << "bool IsLast() const {\n"
     << Indent2 << "bool last = false;\n";