VM: New calling convention for generated code.

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
diff --git a/runtime/vm/flow_graph_compiler_x64.cc b/runtime/vm/flow_graph_compiler_x64.cc
index 40143d4ce34c5fbad73c092ca410fbb3dc2480c4..db95c628f21cfad96d0d2c1c745354131b698722 100644
--- a/runtime/vm/flow_graph_compiler_x64.cc
+++ b/runtime/vm/flow_graph_compiler_x64.cc
@@ -187,6 +187,7 @@ void CompilerDeoptInfoWithStub::GenerateCode(FlowGraphCompiler* compiler,
 
   ASSERT(deopt_env() != NULL);
 
+  __ pushq(CODE_REG);
   __ Call(*StubCode::Deoptimize_entry());
   set_pc_offset(assem->CodeSize());
   __ int3();
@@ -925,11 +926,8 @@ void FlowGraphCompiler::CopyParameters() {
 
   __ Bind(&wrong_num_arguments);
   if (function.IsClosureFunction()) {
-    ASSERT(assembler()->constant_pool_allowed());
-    __ LeaveDartFrame();  // The arguments are still on the stack.
-    ASSERT(!assembler()->constant_pool_allowed());
-    __ jmp(*StubCode::CallClosureNoSuchMethod_entry());
-    __ set_constant_pool_allowed(true);
+    __ LeaveDartFrame(kKeepCalleePP);  // The arguments are still on the stack.
+    __ Jmp(*StubCode::CallClosureNoSuchMethod_entry());
     // The noSuchMethod call may return to the caller, but not here.
   } else if (check_correct_named_args) {
     __ Stop("Wrong arguments");
@@ -983,33 +981,24 @@ void FlowGraphCompiler::GenerateInlinedSetter(intptr_t offset) {
 }
 
 
+static const Register new_pp = R13;
+
+
 // NOTE: If the entry code shape changes, ReturnAddressLocator in profiler.cc
 // needs to be updated to match.
 void FlowGraphCompiler::EmitFrameEntry() {
-  ASSERT(Assembler::EntryPointToPcMarkerOffset() == 0);
-
   const Function& function = parsed_function().function();
-  const Register new_pp = R13;
-  const Register new_pc = R12;
-
-  // Load PC marker.
-  const intptr_t kRIPRelativeLeaqSize = 7;
-  const intptr_t entry_to_rip_offset = __ CodeSize() + kRIPRelativeLeaqSize;
-  __ leaq(new_pc, Address::AddressRIPRelative(-entry_to_rip_offset));
-  ASSERT(__ CodeSize() == entry_to_rip_offset);
-
   // Load pool pointer.
-  const intptr_t object_pool_pc_dist =
-      Instructions::HeaderSize() - Instructions::object_pool_offset();
-  __ movq(new_pp, Address(new_pc, -object_pool_pc_dist));
 
   if (flow_graph().IsCompiledForOsr()) {
     intptr_t extra_slots = StackSize()
         - flow_graph().num_stack_locals()
         - flow_graph().num_copied_params();
     ASSERT(extra_slots >= 0);
-    __ EnterOsrFrame(extra_slots * kWordSize, new_pp, new_pc);
+    __ EnterOsrFrame(extra_slots * kWordSize);
   } else {
+    __ LoadPoolPointer(new_pp);
+
     if (CanOptimizeFunction() &&
         function.IsOptimizable() &&
         (!is_optimizing() || may_reoptimize())) {
@@ -1017,9 +1006,6 @@ void FlowGraphCompiler::EmitFrameEntry() {
       // Load function object using the callee's pool pointer.
       __ LoadFunctionFromCalleePool(function_reg, function, new_pp);
 
-      // Patch point is after the eventually inlined function object.
-      entry_patch_pc_offset_ = assembler()->CodeSize();
-
       // Reoptimization of an optimized function is triggered by counting in
       // IC stubs, but not at the entry of the function.
       if (!is_optimizing()) {
@@ -1032,12 +1018,10 @@ void FlowGraphCompiler::EmitFrameEntry() {
       __ J(GREATER_EQUAL,
            *StubCode::OptimizeFunction_entry(),
            new_pp);
-    } else {
-      entry_patch_pc_offset_ = assembler()->CodeSize();
     }
     ASSERT(StackSize() >= 0);
     __ Comment("Enter frame");
-    __ EnterDartFrame(StackSize() * kWordSize, new_pp, new_pc);
+    __ EnterDartFrame(StackSize() * kWordSize, new_pp);
   }
 }
 
@@ -1082,11 +1066,8 @@ void FlowGraphCompiler::CompileGraph() {
 
       __ Bind(&wrong_num_arguments);
       if (function.IsClosureFunction()) {
-        ASSERT(assembler()->constant_pool_allowed());
-        __ LeaveDartFrame();  // The arguments are still on the stack.
-        ASSERT(!assembler()->constant_pool_allowed());
-        __ jmp(*StubCode::CallClosureNoSuchMethod_entry());
-        __ set_constant_pool_allowed(true);
+        __ LeaveDartFrame(kKeepCalleePP);  // Leave arguments on the stack.
+        __ Jmp(*StubCode::CallClosureNoSuchMethod_entry());
         // The noSuchMethod call may return to the caller, but not here.
       } else {
         __ Stop("Wrong number of arguments");
@@ -1150,10 +1131,6 @@ void FlowGraphCompiler::CompileGraph() {
   GenerateDeferredCode();
   // Emit function patching code. This will be swapped with the first 13 bytes
   // at entry point.
-  patch_code_pc_offset_ = assembler()->CodeSize();
-  // This is patched up to a point in FrameEntry where the PP for the
-  // current function is in R13 instead of PP.
-  __ JmpPatchable(*StubCode::FixCallersTarget_entry(), R13);
 
   if (is_optimizing()) {
     lazy_deopt_pc_offset_ = assembler()->CodeSize();