Add support for interrupting an isolate in the vm. Interrupts are

runtime/vm/code_generator_ia32.cc

Index: runtime/vm/code_generator_ia32.cc
===================================================================
--- runtime/vm/code_generator_ia32.cc	(revision 2291)
+++ runtime/vm/code_generator_ia32.cc	(working copy)
@@ -271,10 +271,6 @@
 // TODO(srdjan): Add check that no object is inlined in the first
 // 5 bytes (length of a jump instruction).
 void CodeGenerator::GeneratePreEntryCode() {
-  // Stack overflow check.
-  __ cmpl(ESP,
-      Address::Absolute(Isolate::Current()->stack_limit_address()));
-  __ j(BELOW_EQUAL, &StubCode::StackOverflowLabel());
   // Do not optimize if:
   // - we count invocations.
   // - optimization disabled via negative 'optimization_invocation_threshold;
@@ -287,6 +283,9 @@
       parsed_function_.function().is_optimizable();
   // Count invocation and check.
   if (FLAG_report_invocation_count || may_optimize) {
+    // TODO(turnidge): It would be nice to remove this nops Right now

[Ivan Posva, 2011/12/14 23:59:50]

"these nops. Right now"

[turnidge, 2011/12/15 21:30:07]

Changed to "this nop", now that it is a single instruction.

On 2011/12/14 23:59:50, Ivan Posva wrote:

+    // we need it to make sure the function is still patchable.
+    __ nop(5);
     const Function& function =
         Function::ZoneHandle(parsed_function_.function().raw());
     __ LoadObject(EAX, function);
@@ -714,6 +713,14 @@
     }
     __ movl(Address(EBP, index * kWordSize), EAX);
   }
+
+  // Generate stack overflow check.
+  __ cmpl(ESP,
+          Address::Absolute(Isolate::Current()->stack_limit_address()));
+  Label no_stack_overflow;
+  __ j(ABOVE, &no_stack_overflow);
+  GenerateCallRuntime(AstNode::kNoId, 0, kStackOverflowRuntimeEntry);
+  __ Bind(&no_stack_overflow);
 }