Allow setting debugger breakpoints on CompareNilICs

BUG=v8:2660
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/14106011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14487 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/debug-arm.cc

@@ -224,6 +224,15 @@ void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
 }
 
 
+void Debug::GenerateCompareNilICDebugBreak(MacroAssembler* masm) {
+  // Register state for CompareNil IC
+  // ----------- S t a t e -------------
+  //  -- r0    : value
+  // -----------------------------------
+  Generate_DebugBreakCallHelper(masm, r0.bit(), 0);
+}
+
+
 void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
   // Calling convention for IC call (from ic-arm.cc)
   // ----------- S t a t e -------------

src/builtins.cc

@@ -1617,6 +1617,11 @@ static void Generate_KeyedStoreIC_DebugBreak(MacroAssembler* masm) {
 }
 
 
+static void Generate_CompareNilIC_DebugBreak(MacroAssembler* masm) {
+  Debug::GenerateCompareNilICDebugBreak(masm);
+}
+
+
 static void Generate_Return_DebugBreak(MacroAssembler* masm) {
   Debug::GenerateReturnDebugBreak(masm);
 }

src/builtins.h

@@ -230,6 +230,8 @@ enum BuiltinExtraArguments {
                                                DEBUG_BREAK)                   \
   V(KeyedStoreIC_DebugBreak,                   KEYED_STORE_IC, DEBUG_STUB,    \
                                                DEBUG_BREAK)                   \
+  V(CompareNilIC_DebugBreak,                   COMPARE_NIL_IC, DEBUG_STUB,    \
+                                               DEBUG_BREAK)                   \
   V(Slot_DebugBreak,                           BUILTIN, DEBUG_STUB,           \
                                                DEBUG_BREAK)                   \
   V(PlainReturn_LiveEdit,                      BUILTIN, DEBUG_STUB,           \

src/debug.cc

@@ -1644,6 +1644,9 @@ Handle<Code> Debug::FindDebugBreak(Handle<Code> code, RelocInfo::Mode mode) {
       case Code::KEYED_STORE_IC:
         return isolate->builtins()->KeyedStoreIC_DebugBreak();
 
+      case Code::COMPARE_NIL_IC:
+        return isolate->builtins()->CompareNilIC_DebugBreak();
+
       default:
         UNREACHABLE();
     }

src/debug.h

@@ -418,6 +418,7 @@ class Debug {
   static void GenerateStoreICDebugBreak(MacroAssembler* masm);
   static void GenerateKeyedLoadICDebugBreak(MacroAssembler* masm);
   static void GenerateKeyedStoreICDebugBreak(MacroAssembler* masm);
+  static void GenerateCompareNilICDebugBreak(MacroAssembler* masm);
   static void GenerateReturnDebugBreak(MacroAssembler* masm);
   static void GenerateCallFunctionStubDebugBreak(MacroAssembler* masm);
   static void GenerateCallFunctionStubRecordDebugBreak(MacroAssembler* masm);

src/ia32/debug-ia32.cc

@@ -240,6 +240,15 @@ void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
 }
 
 
+void Debug::GenerateCompareNilICDebugBreak(MacroAssembler* masm) {
+  // Register state for CompareNil IC
+  // ----------- S t a t e -------------
+  //  -- eax    : value
+  // -----------------------------------
+  Generate_DebugBreakCallHelper(masm, eax.bit(), 0, false);
+}
+
+
 void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
   // Register state for keyed IC call call (from ic-ia32.cc)
   // ----------- S t a t e -------------

src/x64/debug-x64.cc

@@ -233,6 +233,15 @@ void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
 }
 
 
+void Debug::GenerateCompareNilICDebugBreak(MacroAssembler* masm) {
+  // Register state for CompareNil IC
+  // ----------- S t a t e -------------
+  //  -- rax    : value
+  // -----------------------------------
+  Generate_DebugBreakCallHelper(masm, rax.bit(), 0, false);
+}
+
+
 void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
   // Register state for IC call call (from ic-x64.cc)
   // ----------- S t a t e -------------

test/cctest/test-debug.cc

@@ -1090,6 +1090,15 @@ TEST(DebugStub) {
           Builtins::kKeyedLoadIC_DebugBreak));
 #endif
 
+  CheckDebugBreakFunction(
+      &env,
+      "function f6(a){return a==null;}",
+      "f6",
+      0,
+      v8::internal::RelocInfo::CODE_TARGET,
+      Isolate::Current()->builtins()->builtin(
+          Builtins::kCompareNilIC_DebugBreak));
+
   // Check the debug break code stubs for call ICs with different number of
   // parameters.
   Handle<Code> debug_break_0 = v8::internal::ComputeCallDebugBreak(0);