MIPS: Remove unused J(Label *).

src/mips/assembler-mips.cc

Index: src/mips/assembler-mips.cc
diff --git a/src/mips/assembler-mips.cc b/src/mips/assembler-mips.cc
index 96373579d8e098df42c9950aff67f02a1a343e0e..1955d5349a89589d9e84850380aedfc7211159a9 100644
--- a/src/mips/assembler-mips.cc
+++ b/src/mips/assembler-mips.cc
@@ -663,7 +663,7 @@ int Assembler::target_at(int pos, bool is_internal) {
      }
   }
   // Check we have a branch or jump instruction.
-  DCHECK(IsBranch(instr) || IsJ(instr) || IsLui(instr));
+  DCHECK(IsBranch(instr) || IsLui(instr));
   // Do NOT change this to <<2. We rely on arithmetic shifts here, assuming
   // the compiler uses arithmectic shifts for signed integers.
   if (IsBranch(instr)) {
@@ -692,17 +692,8 @@ int Assembler::target_at(int pos, bool is_internal) {
       return pos - delta;
     }
   } else {
-    int32_t imm28 = (instr & static_cast<int32_t>(kImm26Mask)) << 2;
-    if (imm28 == kEndOfJumpChain) {
-      // EndOfChain sentinel is returned directly, not relative to pc or pos.
-      return kEndOfChain;
-    } else {
-      uint32_t instr_address = reinterpret_cast<int32_t>(buffer_ + pos);
-      instr_address &= kImm28Mask;
-      int delta = static_cast<int>(instr_address - imm28);
-      DCHECK(pos > delta);
-      return pos - delta;
-    }
+    UNREACHABLE();
+    return 0;
   }
 }
 
@@ -724,7 +715,7 @@ void Assembler::target_at_put(int32_t pos, int32_t target_pos,
     return;
   }
 
-  DCHECK(IsBranch(instr) || IsJ(instr) || IsLui(instr));
+  DCHECK(IsBranch(instr) || IsLui(instr));
   if (IsBranch(instr)) {
     int32_t imm18 = target_pos - (pos + kBranchPCOffset);
     DCHECK((imm18 & 3) == 0);
@@ -749,15 +740,7 @@ void Assembler::target_at_put(int32_t pos, int32_t target_pos,
     instr_at_put(pos + 1 * Assembler::kInstrSize,
                  instr_ori | (imm & kImm16Mask));
   } else {
-    uint32_t imm28 = reinterpret_cast<uint32_t>(buffer_) + target_pos;
-    imm28 &= kImm28Mask;
-    DCHECK((imm28 & 3) == 0);
-
-    instr &= ~kImm26Mask;
-    uint32_t imm26 = imm28 >> 2;
-    DCHECK(is_uint26(imm26));
-
-    instr_at_put(pos, instr | (imm26 & kImm26Mask));
+    UNREACHABLE();
   }
 }
 
@@ -2418,21 +2401,6 @@ int Assembler::RelocateInternalReference(RelocInfo::Mode rmode, byte* pc,
       instr_at_put(pc + 1 * Assembler::kInstrSize,
                    instr_ori | (imm & kImm16Mask));
       return 2;  // Number of instructions patched.
-    } else if (IsJ(instr)) {
-      uint32_t imm28 = (instr & static_cast<int32_t>(kImm26Mask)) << 2;
-      if (static_cast<int32_t>(imm28) == kEndOfJumpChain) {
-        return 0;  // Number of instructions patched.
-      }
-      imm28 += pc_delta;
-      imm28 &= kImm28Mask;
-      DCHECK((imm28 & 3) == 0);
-
-      instr &= ~kImm26Mask;
-      uint32_t imm26 = imm28 >> 2;
-      DCHECK(is_uint26(imm26));
-
-      instr_at_put(pc, instr | (imm26 & kImm26Mask));
-      return 1;  // Number of instructions patched.
     } else {
       UNREACHABLE();
       return 0;
@@ -2759,7 +2727,7 @@ void Assembler::set_target_address_at(Address pc,
 }
 
 
-void Assembler::JumpLabelToJumpRegister(Address pc) {
+void Assembler::JumpToJumpRegister(Address pc) {
   // Address pc points to lui/ori instructions.
   // Jump to label may follow at pc + 2 * kInstrSize.
   uint32_t* p = reinterpret_cast<uint32_t*>(pc);