Direct call api functions (arm implementation)

src/arm/simulator-arm.cc

Index: src/arm/simulator-arm.cc
===================================================================
--- src/arm/simulator-arm.cc	(revision 6213)
+++ src/arm/simulator-arm.cc	(working copy)
@@ -48,6 +48,7 @@
 using ::v8::internal::OS;
 using ::v8::internal::ReadLine;
 using ::v8::internal::DeleteArray;
+using ::v8::internal::ExternalReference;
 
 // This macro provides a platform independent use of sscanf. The reason for
 // SScanF not being implemented in a platform independent way through
@@ -745,10 +746,12 @@
 // offset from the svc instruction so the simulator knows what to call.
 class Redirection {
  public:
-  Redirection(void* external_function, bool fp_return)
+  Redirection(void* external_function, bool fp_return,
+              ExternalReference::Type type)
       : external_function_(external_function),
         swi_instruction_((AL << 28) | (0xf << 24) | call_rt_redirected),
         fp_return_(fp_return),
+        type_(type),
         next_(list_) {
     Simulator::current()->
         FlushICache(reinterpret_cast<void*>(&swi_instruction_),
@@ -762,13 +765,15 @@
 
   void* external_function() { return external_function_; }
   bool fp_return() { return fp_return_; }
+  ExternalReference::Type type() { return type_; }
 
-  static Redirection* Get(void* external_function, bool fp_return) {
+  static Redirection* Get(void* external_function, bool fp_return,
+                          ExternalReference::Type type) {
     Redirection* current;
     for (current = list_; current != NULL; current = current->next_) {
       if (current->external_function_ == external_function) return current;
     }
-    return new Redirection(external_function, fp_return);
+    return new Redirection(external_function, fp_return, type);
   }
 
   static Redirection* FromSwiInstruction(Instr* swi_instruction) {
@@ -782,6 +787,7 @@
   void* external_function_;
   uint32_t swi_instruction_;
   bool fp_return_;
+  ExternalReference::Type type_;
   Redirection* next_;
   static Redirection* list_;
 };
@@ -790,9 +796,10 @@
 Redirection* Redirection::list_ = NULL;
 
 
-void* Simulator::RedirectExternalReference(void* external_function,
-                                           bool fp_return) {
-  Redirection* redirection = Redirection::Get(external_function, fp_return);
+void* Simulator::RedirectExternalReference(
+    void* external_function, bool fp_return, ExternalReference::Type type) {
+  Redirection* redirection = Redirection::Get(
+      external_function, fp_return, type);
   return redirection->address_of_swi_instruction();
 }
 
@@ -1533,6 +1540,9 @@
                                          int32_t arg2,
                                          int32_t arg3);
 
+// This signature supports direct call in to js function native callback
+// (refer to InvocationCallback in v8.h).
+typedef v8::Handle<v8::Value> (*SimulatorRuntimeApiCall)(int32_t arg0);
 
 // Software interrupt instructions are used by the simulator to call into the
 // C-based V8 runtime.
@@ -1574,33 +1584,56 @@
         double result = target(arg0, arg1, arg2, arg3);
         SetFpResult(result);
       } else {
-        intptr_t external =
-            reinterpret_cast<int32_t>(redirection->external_function());
-        SimulatorRuntimeCall target =
-            reinterpret_cast<SimulatorRuntimeCall>(external);
-        if (::v8::internal::FLAG_trace_sim || !stack_aligned) {
-          PrintF(
-              "Call to host function at %p args %08x, %08x, %08x, %08x, %0xc",
-              FUNCTION_ADDR(target),
-              arg0,
-              arg1,
-              arg2,
-              arg3,
-              arg4);
-          if (!stack_aligned) {
-            PrintF(" with unaligned stack %08x\n", get_register(sp));
+        if (redirection->type() == ExternalReference::DIRECT_CALL) {
+          intptr_t external =
+              reinterpret_cast<int32_t>(redirection->external_function());
+          SimulatorRuntimeApiCall target =

[SeRya, 2011/01/21 09:52:36]

May be to add ASSERT that where is indeed one argument? PrepareCallApiFunction
looks quite general, but in simulator only one argument is actually passed.

[Zaheer, 2011/01/21 11:51:50]

simulator also uses stack space for the arguments (ie.. behavior is exactly same
as in device). r0 points to Arguments&

+              reinterpret_cast<SimulatorRuntimeApiCall>(external);
+          if (::v8::internal::FLAG_trace_sim || !stack_aligned) {
+            PrintF(
+                "Call to host function at %p args %08x",
+                FUNCTION_ADDR(target),
+                arg0);
+            if (!stack_aligned) {
+              PrintF(" with unaligned stack %08x\n", get_register(sp));
+            }
+            PrintF("\n");
           }
-          PrintF("\n");
+          CHECK(stack_aligned);
+          v8::Handle<v8::Value> result = target(arg0);
+          if (::v8::internal::FLAG_trace_sim) {
+            PrintF("Returned %p\n", reinterpret_cast<void *>(*result));
+          }
+          set_register(r0, (int32_t) *result);
+        } else {
+          intptr_t external =
+              reinterpret_cast<int32_t>(redirection->external_function());
+          SimulatorRuntimeCall target =
+              reinterpret_cast<SimulatorRuntimeCall>(external);
+          if (::v8::internal::FLAG_trace_sim || !stack_aligned) {
+            PrintF(
+                "Call to host function at %p args %08x, %08x, %08x, %08x, %0xc",
+                FUNCTION_ADDR(target),
+                arg0,
+                arg1,
+                arg2,
+                arg3,
+                arg4);
+            if (!stack_aligned) {
+              PrintF(" with unaligned stack %08x\n", get_register(sp));
+            }
+            PrintF("\n");
+          }
+          CHECK(stack_aligned);
+          int64_t result = target(arg0, arg1, arg2, arg3, arg4);
+          int32_t lo_res = static_cast<int32_t>(result);
+          int32_t hi_res = static_cast<int32_t>(result >> 32);
+          if (::v8::internal::FLAG_trace_sim) {
+            PrintF("Returned %08x\n", lo_res);
+          }
+          set_register(r0, lo_res);
+          set_register(r1, hi_res);
         }
-        CHECK(stack_aligned);
-        int64_t result = target(arg0, arg1, arg2, arg3, arg4);
-        int32_t lo_res = static_cast<int32_t>(result);
-        int32_t hi_res = static_cast<int32_t>(result >> 32);
-        if (::v8::internal::FLAG_trace_sim) {
-          PrintF("Returned %08x\n", lo_res);
-        }
-        set_register(r0, lo_res);
-        set_register(r1, hi_res);
       }
       set_register(lr, saved_lr);
       set_pc(get_register(lr));