[Hexagon] Emit jump tables in text section based on a flag

This patch adds a new LLVM flag -hexagon-emit-jt-text which is defaulted to 
"false". The value "true" emits the switch generated jump tables in text section.
Differential Revision: https://reviews.llvm.org/D34820

llvm-svn: 306872

2 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp b/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp
index 4dacb150139..34df2ebcc52 100644
--- a/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp
@@ -49,6 +49,10 @@ static cl::opt<bool> TraceGVPlacement("trace-gv-placement",
   cl::Hidden, cl::init(false),
   cl::desc("Trace global value placement"));
 
+static cl::opt<bool>
+    EmitJtInText("hexagon-emit-jt-text", cl::Hidden, cl::init(false),
+                 cl::desc("Emit hexagon jump tables in function section"));
+
 // TraceGVPlacement controls messages for all builds. For builds with assertions
 // (debug or release), messages are also controlled by the usual debug flags
 // (e.g. -debug and -debug-only=globallayout)
@@ -256,6 +260,11 @@ unsigned HexagonTargetObjectFile::getSmallDataSize() const {
   return SmallDataThreshold;
 }
 
+bool HexagonTargetObjectFile::shouldPutJumpTableInFunctionSection(
+    bool UsesLabelDifference, const Function &F) const {
+  return EmitJtInText;
+}
+
 /// Descends any type down to "elementary" components,
 /// discovering the smallest addressable one.
 /// If zero is returned, declaration will not be modified.
diff --git a/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.h b/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.h
index 58dff2b95e1..373d850b53b 100644
--- a/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.h
+++ b/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.h
@@ -33,6 +33,9 @@ namespace llvm {
 
     unsigned getSmallDataSize() const;
 
+    bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
+                                             const Function &F) const override;
+
   private:
     MCSectionELF *SmallDataSection;
     MCSectionELF *SmallBSSSection;