Add 64-bit stubs to call into the runtime and to call native functions.

runtime/vm/stub_code_x64.cc

Index: runtime/vm/stub_code_x64.cc
===================================================================
--- runtime/vm/stub_code_x64.cc	(revision 2205)
+++ runtime/vm/stub_code_x64.cc	(working copy)
@@ -5,34 +5,165 @@
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
+#include "vm/native_entry.h"
 #include "vm/stub_code.h"
 
 #define __ assembler->
 
 namespace dart {
 
+// Input parameters:
+//   RSP : points to return address.
+//   RSP + 8 : address of last argument in argument array.
+//   RSP + 8*R10 : address of first argument in argument array.
+//   RSP + 8*R10 + 8 : address of return value.
+//   RBX : address of the runtime function to call.
+//   R10 : number of arguments to the call.
+static void GenerateCallRuntimeStub(Assembler* assembler) {
+  const intptr_t isolate_offset = NativeArguments::isolate_offset();
+  const intptr_t argc_offset = NativeArguments::argc_offset();
+  const intptr_t argv_offset = NativeArguments::argv_offset();
+  const intptr_t retval_offset = NativeArguments::retval_offset();
+
+  __ EnterFrame(0);
+
+  // Load current Isolate pointer from Context structure into RAX.
+  __ movq(RAX, FieldAddress(CTX, Context::isolate_offset()));
+
+  // Save exit frame information to enable stack walking as we are about
+  // to transition to Dart VM C++ code.
+  __ movq(Address(RAX, Isolate::top_exit_frame_info_offset()), RSP);
+
+  // Save current Context pointer into Isolate structure.
+  __ movq(Address(RAX, Isolate::top_context_offset()), CTX);
+
+  // Cache Isolate pointer into CTX while executing runtime code.
+  __ movq(CTX, RAX);
+
+  // Reserve space for arguments and align frame before entering C++ world.
+  __ AddImmediate(RSP, Immediate(-sizeof(NativeArguments)));
+  if (OS::ActivationFrameAlignment() > 0) {
+    __ andq(RSP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
+  }
+
+  // Pass NativeArguments structure by value and call runtime.
+  __ movq(Address(RSP, isolate_offset), CTX);  // Set isolate in NativeArgs.
+  __ movq(Address(RSP, argc_offset), R10);  // Set argc in NativeArguments.
+  __ leaq(RAX, Address(RBP, R10, TIMES_8, 1 * kWordSize));  // Compute argv.
+  __ movq(Address(RSP, argv_offset), RAX);  // Set argv in NativeArguments.
+  __ addq(RAX, Immediate(1 * kWordSize));  // Retval is next to 1st argument.
+  __ movq(Address(RSP, retval_offset), RAX);  // Set retval in NativeArguments.
+  __ call(RBX);
+
+  // Reset exit frame information in Isolate structure.
+  __ movq(Address(CTX, Isolate::top_exit_frame_info_offset()), Immediate(0));
+
+  // Load Context pointer from Isolate structure into RBX.
+  __ movq(RBX, Address(CTX, Isolate::top_context_offset()));
+
+  // Reset Context pointer in Isolate structure.
+  const Immediate raw_null =
+      Immediate(reinterpret_cast<intptr_t>(Object::null()));
+  __ movq(Address(CTX, Isolate::top_context_offset()), raw_null);
+
+  // Cache Context pointer into CTX while executing Dart code.
+  __ movq(CTX, RBX);
+
+  __ LeaveFrame();
+  __ ret();
+}
+
+
+// Input parameters:
+//   RSP : points to return address.
+//   RSP + 8 : address of last argument in argument array.
+//   RSP + 8*R10 : address of first argument in argument array.
+//   RSP + 8*R10 + 8 : address of return value.
+//   RBX : address of the runtime function to call.
+//   R10 : number of arguments to the call.
 void StubCode::GenerateDartCallToRuntimeStub(Assembler* assembler) {
-  __ Unimplemented("DartCallToRuntime stub");
+  GenerateCallRuntimeStub(assembler);
 }
 
 
+// Input parameters:
+//   RSP : points to return address.
+//   RSP + 8 : address of last argument in argument array.
+//   RSP + 8*R10 : address of first argument in argument array.
+//   RSP + 8*R10 + 8 : address of return value.
+//   RBX : address of the runtime function to call.
+//   R10 : number of arguments to the call.
 void StubCode::GenerateStubCallToRuntimeStub(Assembler* assembler) {
-  __ Unimplemented("StubCallToRuntime stub");
+  GenerateCallRuntimeStub(assembler);
 }
 
 
+// Input parameters:
+//   RSP : points to return address.
+//   RSP + 8 : address of return value.
+//   RAX : address of first argument in argument array.
+//   RAX - 8*R10 + 8 : address of last argument in argument array.
+//   RBX : address of the native function to call.
+//   R10 : number of arguments to the call.
 void StubCode::GenerateCallNativeCFunctionStub(Assembler* assembler) {
-  __ Unimplemented("CallNativeCFunction stub");
-}
+  const intptr_t native_args_struct_offset = 0;
+  const intptr_t isolate_offset =
+      NativeArguments::isolate_offset() + native_args_struct_offset;
+  const intptr_t argc_offset =
+      NativeArguments::argc_offset() + native_args_struct_offset;
+  const intptr_t argv_offset =
+      NativeArguments::argv_offset() + native_args_struct_offset;
+  const intptr_t retval_offset =
+      NativeArguments::retval_offset() + native_args_struct_offset;
 
+  __ EnterFrame(0);
 
-void StubCode::GenerateCallNoSuchMethodFunctionStub(Assembler* assembler) {
-  __ Unimplemented("CallNoSuchMethodFunction stub");
-}
+  // Load current Isolate pointer from Context structure into R8.
+  __ movq(R8, FieldAddress(CTX, Context::isolate_offset()));
 
+  // Save exit frame information to enable stack walking as we are about
+  // to transition to native code.
+  __ movq(Address(R8, Isolate::top_exit_frame_info_offset()), RSP);
 
-void StubCode::GenerateInvokeDartCodeStub(Assembler* assembler) {
-  __ Unimplemented("InvokeDartCode stub");
+  // Save current Context pointer into Isolate structure.
+  __ movq(Address(R8, Isolate::top_context_offset()), CTX);
+
+  // Cache Isolate pointer into CTX while executing native code.
+  __ movq(CTX, R8);
+
+  // Reserve space for the native arguments structure passed on the stack (the
+  // outgoing pointer parameter to the native arguments structure is passed in
+  // RDI) and align frame before entering the C++ world.
+  __ AddImmediate(RSP, Immediate(-sizeof(NativeArguments)));
+  if (OS::ActivationFrameAlignment() > 0) {
+    __ andq(RSP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
+  }
+
+  // Pass NativeArguments structure by value and call native function.
+  __ movq(Address(RSP, isolate_offset), CTX);  // Set isolate in NativeArgs.
+  __ movq(Address(RSP, argc_offset), R10);  // Set argc in NativeArguments.
+  __ movq(Address(RSP, argv_offset), RAX);  // Set argv in NativeArguments.
+  __ leaq(RAX, Address(RBP, 2 * kWordSize));  // Compute return value addr.
+  __ movq(Address(RSP, retval_offset), RAX);  // Set retval in NativeArguments.
+  __ movq(RDI, RSP);  // Pass the pointer to the NativeArguments.
+  __ call(RBX);
+
+  // Reset exit frame information in Isolate structure.
+  __ movq(Address(CTX, Isolate::top_exit_frame_info_offset()), Immediate(0));
+
+  // Load Context pointer from Isolate structure into R8.
+  __ movq(R8, Address(CTX, Isolate::top_context_offset()));
+
+  // Reset Context pointer in Isolate structure.
+  const Immediate raw_null =
+      Immediate(reinterpret_cast<intptr_t>(Object::null()));
+  __ movq(Address(CTX, Isolate::top_context_offset()), raw_null);
+
+  // Cache Context pointer into CTX while executing Dart code.
+  __ movq(CTX, R8);
+
+  __ LeaveFrame();
+  __ ret();
 }
 
 
@@ -41,16 +172,157 @@
 }
 
 
+void StubCode::GenerateStackOverflowStub(Assembler* assembler) {
+  __ Unimplemented("StackOverflow stub");
+}
+
+
+void StubCode::GenerateOptimizeInvokedFunctionStub(Assembler* assembler) {
+  __ Unimplemented("OptimizeInvokedFunction stub");
+}
+
+
+void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
+  __ Unimplemented("FixCallersTarget stub");
+}
+
+
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   __ Unimplemented("MegamorphicLookup stub");
 }
 
 
+void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
+  __ Unimplemented("Deoptimize stub");
+}
+
+
+void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
+  __ Unimplemented("AllocateArray stub");
+}
+
+
 void StubCode::GenerateCallClosureFunctionStub(Assembler* assembler) {
   __ Unimplemented("CallClosureFunction stub");
 }
 
 
+// Called when invoking Dart code from C++ (VM code).
+// Input parameters:
+//   RSP : points to return address.
+//   RDI : entrypoint of the Dart function to call.
+//   RSI : arguments descriptor array.
+//   RDX : pointer to the argument array.
+//   RCX : new context containing the current isolate pointer.
+void StubCode::GenerateInvokeDartCodeStub(Assembler* assembler) {
+  // Save frame pointer coming in.
+  __ EnterFrame(0);
+
+  // Save arguments descriptor array and new context.
+  const intptr_t kArgumentsDescOffset = -1 * kWordSize;
+  __ pushq(RSI);
+  const intptr_t kNewContextOffset = -2 * kWordSize;
+  __ pushq(RCX);
+
+  // Save C++ ABI callee-saved registers.
+  __ pushq(RBX);
+  __ pushq(R12);
+  __ pushq(R13);
+  __ pushq(R14);
+  __ pushq(R15);
+
+  // The new Context structure contains a pointer to the current Isolate
+  // structure. Cache the Context pointer in the CTX register so that it is
+  // available in generated code and calls to Isolate::Current() need not be
+  // done. The assumption is that this register will never be clobbered by
+  // compiled or runtime stub code.
+
+  // Cache the new Context pointer into CTX while executing Dart code.
+  __ movq(CTX, Address(RCX, VMHandles::kOffsetOfRawPtrInHandle));
+
+  // Load Isolate pointer from Context structure into R8.
+  __ movq(R8, FieldAddress(CTX, Context::isolate_offset()));
+
+  // Save the top exit frame info. Use RAX as a temporary register.
+  __ movq(RAX, Address(R8, Isolate::top_exit_frame_info_offset()));
+  __ pushq(RAX);
+  __ movq(Address(R8, Isolate::top_exit_frame_info_offset()), Immediate(0));
+
+  // StackFrameIterator reads the top exit frame info saved in this frame.
+  // The constant kExitLinkOffsetInEntryFrame must be kept in sync with the
+  // code above: kExitLinkOffsetInEntryFrame = -8 * kWordSize.
+
+  // Save the old Context pointer. Use RAX as a temporary register.
+  // Note that VisitObjectPointers will find this saved Context pointer during
+  // GC marking, since it traverses any information between SP and
+  // FP - kExitLinkOffsetInEntryFrame.
+  __ movq(RAX, Address(R8, Isolate::top_context_offset()));
+  __ pushq(RAX);
+
+  // Load arguments descriptor array into R10, which is passed to Dart code.
+  __ movq(R10, Address(RSI, VMHandles::kOffsetOfRawPtrInHandle));
+
+  // Load number of arguments into RBX.
+  __ movq(RBX, FieldAddress(R10, Array::data_offset()));
+  __ SmiUntag(RBX);
+
+  // Set up arguments for the Dart call.
+  Label push_arguments;
+  Label done_push_arguments;
+  __ testq(RBX, RBX);  // check if there are arguments.
+  __ j(ZERO, &done_push_arguments, Assembler::kNearJump);
+  __ movq(RAX, Immediate(0));
+  __ Bind(&push_arguments);
+  __ movq(RCX, Address(RDX, RAX, TIMES_8, 0));  // RDX is start of arguments.
+  __ movq(RCX, Address(RCX, VMHandles::kOffsetOfRawPtrInHandle));
+  __ pushq(RCX);
+  __ incq(RAX);
+  __ cmpq(RAX, RBX);
+  __ j(LESS, &push_arguments, Assembler::kNearJump);
+  __ Bind(&done_push_arguments);
+
+  // Call the Dart code entrypoint.
+  __ call(RDI);  // R10 is the arguments descriptor array.
+
+  // Read the saved new Context pointer.
+  __ movq(CTX, Address(RBP, kNewContextOffset));
+  __ movq(CTX, Address(CTX, VMHandles::kOffsetOfRawPtrInHandle));
+
+  // Read the saved arguments descriptor array to obtain the number of passed
+  // arguments, which is the first element of the array, a Smi.
+  __ movq(RSI, Address(RBP, kArgumentsDescOffset));
+  __ movq(R10, Address(RSI, VMHandles::kOffsetOfRawPtrInHandle));
+  __ movq(RDX, FieldAddress(R10, Array::data_offset()));
+  // Get rid of arguments pushed on the stack.
+  __ leaq(RSP, Address(RSP, RDX, TIMES_4, 0));  // RDX is a Smi.
+
+  // Load Isolate pointer from Context structure into CTX. Drop Context.
+  __ movq(CTX, FieldAddress(CTX, Context::isolate_offset()));
+
+  // Restore the saved Context pointer into the Isolate structure.
+  // Uses RCX as a temporary register for this.
+  __ popq(RCX);
+  __ movq(Address(CTX, Isolate::top_context_offset()), RCX);
+
+  // Restore the saved top exit frame info back into the Isolate structure.
+  // Uses RDX as a temporary register for this.
+  __ popq(RDX);
+  __ movq(Address(CTX, Isolate::top_exit_frame_info_offset()), RDX);
+
+  // Restore C++ ABI callee-saved registers.
+  __ popq(R15);
+  __ popq(R14);
+  __ popq(R13);
+  __ popq(R12);
+  __ popq(RBX);
+
+  // Restore the frame pointer.
+  __ LeaveFrame();
+
+  __ ret();
+}
+
+
 void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
   __ Unimplemented("AllocateContext stub");
 }
@@ -67,6 +339,26 @@
   __ Unimplemented("AllocateClosure stub");
 }
 
+
+void StubCode::GenerateCallNoSuchMethodFunctionStub(Assembler* assembler) {
+  __ Unimplemented("CallNoSuchMethodFunction stub");
+}
+
+
+void StubCode::GenerateInlineCacheStub(Assembler* assembler) {
+  __ Unimplemented("InlineCache stub");
+}
+
+
+void StubCode::GenerateBreakpointStaticStub(Assembler* assembler) {
+  __ Unimplemented("BreakpointStatic stub");
+}
+
+
+void StubCode::GenerateBreakpointDynamicStub(Assembler* assembler) {
+  __ Unimplemented("BreakpointDynamic stub");
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64