[Turbofan] Insert nops for lazy bailout patching, fix translation of literals.

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index c8d5f26d0dc6b3303623a9343a0cab8d69dd5405..c9c2686677d8c342d334b1dd7cca876f85dbbf9b 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -137,6 +137,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kArchCallCodeObject: {
+      EnsureSpaceForLazyDeopt();
       if (instr->InputAt(0)->IsImmediate()) {
         __ Call(Handle<Code>::cast(i.InputHeapObject(0)),
                 RelocInfo::CODE_TARGET);
@@ -149,6 +150,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kArchCallJSFunction: {
+      EnsureSpaceForLazyDeopt();
       Register func = i.InputRegister(0);
       if (FLAG_debug_code) {
         // Check the function's context matches the context argument.
@@ -854,6 +856,29 @@ void CodeGenerator::AssembleSwap(InstructionOperand* source,
 
 void CodeGenerator::AddNopForSmiCodeInlining() { __ movz(xzr, 0); }
 
+
+void CodeGenerator::EnsureSpaceForLazyDeopt() {
+  int space_needed = Deoptimizer::patch_size();
+  if (!linkage()->info()->IsStub()) {
+    // Ensure that we have enough space after the previous lazy-bailout
+    // instruction for patching the code here.
+    intptr_t current_pc = masm()->pc_offset();
+
+    if (current_pc < (last_lazy_deopt_pc_ + space_needed)) {
+      ptrdiff_t padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;

[Benedikt Meurer, 2014/09/22 07:23:37]

ptrdiff_t is wrong here, should be int.

+      DCHECK((padding_size % kInstructionSize) == 0);
+      InstructionAccurateScope instruction_accurate(
+          masm(), padding_size / kInstructionSize);
+
+      while (padding_size > 0) {
+        __ nop();
+        padding_size -= kInstructionSize;
+      }
+    }
+  }
+  MarkLazyDeoptSite();
+}
+
 #undef __
 
 }  // namespace compiler