Remove remaining uses of null's absolute address from non-IA32.

runtime/vm/stub_code_arm.cc

Index: runtime/vm/stub_code_arm.cc
diff --git a/runtime/vm/stub_code_arm.cc b/runtime/vm/stub_code_arm.cc
index ab56734911c1f712c25c8e54825d3d953e6a9a22..9d2883b58d65b194d1cb612ba2591b19a494a377 100644
--- a/runtime/vm/stub_code_arm.cc
+++ b/runtime/vm/stub_code_arm.cc
@@ -303,7 +303,7 @@ void StubCode::GenerateCallStaticFunctionStub(Assembler* assembler) {
   // calling into the runtime.
   __ EnterStubFrame();
   // Setup space on stack for return value and preserve arguments descriptor.
-  __ LoadImmediate(R0, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R0, Object::null_object());
   __ PushList((1 << R0) | (1 << R4));
   __ CallRuntime(kPatchStaticCallRuntimeEntry, 0);
   // Get Code object result and restore arguments descriptor array.
@@ -324,7 +324,7 @@ void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
   // calling into the runtime.
   __ EnterStubFrame();
   // Setup space on stack for return value and preserve arguments descriptor.
-  __ LoadImmediate(R0, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R0, Object::null_object());
   __ PushList((1 << R0) | (1 << R4));
   __ CallRuntime(kFixCallersTargetRuntimeEntry, 0);
   // Get Code object result and restore arguments descriptor array.
@@ -342,7 +342,7 @@ void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
 void StubCode::GenerateFixAllocationStubTargetStub(Assembler* assembler) {
   __ EnterStubFrame();
   // Setup space on stack for return value.
-  __ LoadImmediate(R0, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R0, Object::null_object());
   __ Push(R0);
   __ CallRuntime(kFixAllocationStubTargetRuntimeEntry, 0);
   // Get Code object result.
@@ -360,7 +360,7 @@ void StubCode::GenerateFixAllocationStubTargetStub(Assembler* assembler) {
 //   FP[kParamEndSlotFromFp + 1]: last argument.
 static void PushArgumentsArray(Assembler* assembler) {
   // Allocate array to store arguments of caller.
-  __ LoadImmediate(R1, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R1, Object::null_object());
   // R1: null element type for raw Array.
   // R2: smi-tagged argument count, may be zero.
   __ BranchLink(*StubCode::AllocateArray_entry());
@@ -563,7 +563,7 @@ void StubCode::GenerateMegamorphicMissStub(Assembler* assembler) {
   // Push the receiver.
   // Push IC data object.
   // Push arguments descriptor array.
-  __ LoadImmediate(IP, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(IP, Object::null_object());
   __ PushList((1 << R4) | (1 << R5) | (1 << R6) | (1 << IP));
   __ CallRuntime(kMegamorphicCacheMissHandlerRuntimeEntry, 3);
   // Remove arguments.
@@ -688,7 +688,7 @@ void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
   // R7: new object end address.
   // R9: allocation size.
 
-  __ LoadImmediate(R4, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R4, Object::null_object());
   __ mov(R5, Operand(R4));
   __ AddImmediate(R6, R0, sizeof(RawArray) - kHeapObjectTag);
   __ InitializeFieldsNoBarrier(R0, R6, R7, R4, R5);
@@ -701,7 +701,7 @@ void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
   // Create a stub frame as we are pushing some objects on the stack before
   // calling into the runtime.
   __ EnterStubFrame();
-  __ LoadImmediate(IP, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(IP, Object::null_object());
   // Setup space on stack for return value.
   // Push array length as Smi and element type.
   __ PushList((1 << R1) | (1 << R2) | (1 << IP));
@@ -914,7 +914,7 @@ void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
     // R2: object size.
     // R3: next object start.
     // R6: allocation stats address.
-    __ LoadImmediate(R4, reinterpret_cast<intptr_t>(Object::null()));
+    __ LoadObject(R4, Object::null_object());
     __ InitializeFieldNoBarrier(R0, FieldAddress(R0, Context::parent_offset()),
                                 R4);
 
@@ -940,7 +940,7 @@ void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
   // calling into the runtime.
   __ EnterStubFrame();
   // Setup space on stack for return value.
-  __ LoadImmediate(R2, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R2, Object::null_object());
   __ SmiTag(R1);
   __ PushList((1 << R1) | (1 << R2));
   __ CallRuntime(kAllocateContextRuntimeEntry, 1);  // Allocate context.
@@ -1086,7 +1086,7 @@ void StubCode::GenerateAllocationStubForClass(
     __ add(R0, R0, Operand(kHeapObjectTag));
 
     // Initialize the remaining words of the object.
-    __ LoadImmediate(R2, reinterpret_cast<intptr_t>(Object::null()));
+    __ LoadObject(R2, Object::null_object());
 
     // R2: raw null.
     // R0: new object (tagged).
@@ -1144,7 +1144,7 @@ void StubCode::GenerateAllocationStubForClass(
   // Create a stub frame as we are pushing some objects on the stack before
   // calling into the runtime.
   __ EnterStubFrame();  // Uses pool pointer to pass cls to runtime.
-  __ LoadImmediate(R2, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R2, Object::null_object());
   __ Push(R2);  // Setup space on stack for return value.
   __ PushObject(cls);  // Push class of object to be allocated.
   if (is_cls_parameterized) {
@@ -1184,7 +1184,7 @@ void StubCode::GenerateCallClosureNoSuchMethodStub(Assembler* assembler) {
   // Push space for the return value.
   // Push the receiver.
   // Push arguments descriptor array.
-  __ LoadImmediate(IP, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(IP, Object::null_object());
   __ PushList((1 << R4) | (1 << R6) | (1 << IP));
 
   // R2: Smi-tagged arguments array length.
@@ -1424,7 +1424,7 @@ void StubCode::GenerateNArgsCheckInlineCacheStub(
   // Create a stub frame as we are pushing some objects on the stack before
   // calling into the runtime.
   __ EnterStubFrame();
-  __ LoadImmediate(R0, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R0, Object::null_object());
   // Preserve IC data object and arguments descriptor array and
   // setup space on stack for result (target code object).
   __ PushList((1 << R0) | (1 << R4) | (1 << R5));
@@ -1699,7 +1699,7 @@ void StubCode::GenerateLazyCompileStub(Assembler* assembler) {
 // R5: Contains an ICData.
 void StubCode::GenerateICCallBreakpointStub(Assembler* assembler) {
   __ EnterStubFrame();
-  __ LoadImmediate(R0, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R0, Object::null_object());
   // Preserve arguments descriptor and make room for result.
   __ PushList((1 << R0) | (1 << R5));
   __ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
@@ -1711,7 +1711,7 @@ void StubCode::GenerateICCallBreakpointStub(Assembler* assembler) {
 
 void StubCode::GenerateRuntimeCallBreakpointStub(Assembler* assembler) {
   __ EnterStubFrame();
-  __ LoadImmediate(R0, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R0, Object::null_object());
   // Make room for result.
   __ PushList((1 << R0));
   __ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
@@ -1754,7 +1754,7 @@ static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
     __ LoadClass(R3, R0, R4);
     // Compute instance type arguments into R4.
     Label has_no_type_arguments;
-    __ LoadImmediate(R4, reinterpret_cast<intptr_t>(Object::null()));
+    __ LoadObject(R4, Object::null_object());
     __ ldr(R5, FieldAddress(R3,
         Class::type_arguments_field_offset_in_words_offset()));
     __ CompareImmediate(R5, Class::kNoTypeArguments);
@@ -1779,7 +1779,7 @@ static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
   __ SmiTag(R3);
   __ Bind(&loop);
   __ ldr(R5, Address(R2, kWordSize * SubtypeTestCache::kInstanceClassId));
-  __ CompareImmediate(R5, reinterpret_cast<intptr_t>(Object::null()));
+  __ CompareObject(R5, Object::null_object());
   __ b(&not_found, EQ);
   __ cmp(R5, Operand(R3));
   if (n == 1) {
@@ -1804,7 +1804,7 @@ static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
   __ b(&loop);
   // Fall through to not found.
   __ Bind(&not_found);
-  __ LoadImmediate(R1, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(R1, Object::null_object());
   __ Ret();
 
   __ Bind(&found);
@@ -1889,7 +1889,7 @@ void StubCode::GenerateJumpToExceptionHandlerStub(Assembler* assembler) {
 void StubCode::GenerateOptimizeFunctionStub(Assembler* assembler) {
   __ EnterStubFrame();
   __ Push(R4);
-  __ LoadImmediate(IP, reinterpret_cast<intptr_t>(Object::null()));
+  __ LoadObject(IP, Object::null_object());
   __ Push(IP);  // Setup space on stack for return value.
   __ Push(R6);
   __ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);