From: Richard Osborne <richard@xmos.com>
Date: Thu, 11 Mar 2010 14:58:16 +0000 (+0000)
Subject: Add a new jump table encoding to indicate jump tables entries
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=95da605e15a6f108b551ecc6772823ea53de3007;p=oota-llvm.git

Add a new jump table encoding to indicate jump tables entries
are inside the function by the target at the point of use.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98255 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/CodeGen/MachineJumpTableInfo.h b/include/llvm/CodeGen/MachineJumpTableInfo.h
index 5a4c9a9fb76..b8d04bf2132 100644
--- a/include/llvm/CodeGen/MachineJumpTableInfo.h
+++ b/include/llvm/CodeGen/MachineJumpTableInfo.h
@@ -61,7 +61,11 @@ public:
     ///      .set L4_5_set_123, LBB123 - LJTI1_2
     ///      .word L4_5_set_123
     EK_LabelDifference32,
-    
+
+    /// EK_Inline - Jump table entries are emitted inline at their point of
+    /// use. It is the responsibility of the target to emit the entries.
+    EK_Inline,
+
     /// EK_Custom32 - Each entry is a 32-bit value that is custom lowered by the
     /// TargetLowering::LowerCustomJumpTableEntry hook.
     EK_Custom32
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 4978fba44cd..53e1fab0593 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -651,6 +651,7 @@ void AsmPrinter::EmitConstantPool() {
 void AsmPrinter::EmitJumpTableInfo() {
   const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
   if (MJTI == 0) return;
+  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
   const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
   if (JT.empty()) return;
 
@@ -727,6 +728,8 @@ void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
                                     unsigned UID) const {
   const MCExpr *Value = 0;
   switch (MJTI->getEntryKind()) {
+  case MachineJumpTableInfo::EK_Inline:
+    llvm_unreachable("Cannot emit EK_Inline jump table entry"); break;
   case MachineJumpTableInfo::EK_Custom32:
     Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
                                                               OutContext);
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 1e3cb1ee5a5..cecfa156264 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -574,6 +574,8 @@ unsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const {
   case MachineJumpTableInfo::EK_LabelDifference32:
   case MachineJumpTableInfo::EK_Custom32:
     return 4;
+  case MachineJumpTableInfo::EK_Inline:
+    return 0;
   }
   assert(0 && "Unknown jump table encoding!");
   return ~0;
@@ -591,6 +593,8 @@ unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const {
   case MachineJumpTableInfo::EK_LabelDifference32:
   case MachineJumpTableInfo::EK_Custom32:
     return TD.getABIIntegerTypeAlignment(32);
+  case MachineJumpTableInfo::EK_Inline:
+    return 1;
   }
   assert(0 && "Unknown jump table encoding!");
   return ~0;
diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp
index 783ebb4deb6..26353f794f2 100644
--- a/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -1393,6 +1393,8 @@ void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
 void JITEmitter::initJumpTableInfo(MachineJumpTableInfo *MJTI) {
   if (TheJIT->getJITInfo().hasCustomJumpTables())
     return;
+  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline)
+    return;
 
   const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
   if (JT.empty()) return;
@@ -1420,6 +1422,8 @@ void JITEmitter::emitJumpTableInfo(MachineJumpTableInfo *MJTI) {
 
   
   switch (MJTI->getEntryKind()) {
+  case MachineJumpTableInfo::EK_Inline:
+    return;
   case MachineJumpTableInfo::EK_BlockAddress: {
     // EK_BlockAddress - Each entry is a plain address of block, e.g.:
     //     .word LBB123