Fast-codegen: Arguments object working on all platforms.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 8ed7f55a059575386c547354c4b5c10b20e0b718..e3be800554a4d35acec8e74651d96913a70b6fa4 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -1192,6 +1192,26 @@ Handle<Code> MacroAssembler::ResolveBuiltin(Builtins::JavaScript id,
 }
 
 
+void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
+  if (context_chain_length > 0) {
+    // Move up the chain of contexts to the context containing the slot.
+    mov(dst, Operand(esi, Context::SlotOffset(Context::CLOSURE_INDEX)));
+    // Load the function context (which is the incoming, outer context).
+    mov(dst, FieldOperand(dst, JSFunction::kContextOffset));
+    for (int i = 1; i < context_chain_length; i++) {
+      mov(dst, Operand(dst, Context::SlotOffset(Context::CLOSURE_INDEX)));
+      mov(dst, FieldOperand(dst, JSFunction::kContextOffset));
+    }
+    // The context may be an intermediate context, not a function context.
+    mov(dst, Operand(dst, Context::SlotOffset(Context::FCONTEXT_INDEX)));
+  } else {  // Slot is in the current function context.
+    // The context may be an intermediate context, not a function context.
+    mov(dst, Operand(esi, Context::SlotOffset(Context::FCONTEXT_INDEX)));
+  }
+}
+
+
+
 void MacroAssembler::Ret() {
   ret(0);
 }