WIP

cairo0-bootloader/execution/execute_entry_point.cairo

@@ -173,13 +173,8 @@ func execute_entry_point{
 
     local syscall_ptr: felt*;
 
-    %{  
-        from starkware.starknet.core.os.syscall_handler import SyscallHandlerBase
-
+    %{
         ids.syscall_ptr = segments.add()
-
-        syscall_handler = SyscallHandlerBase(ids.syscall_ptr)
-        syscall_handler.set_syscall_ptr(syscall_ptr=ids.syscall_ptr)
     %}
 
     let builtin_ptrs: BuiltinPointers* = prepare_builtin_ptrs_for_execute(builtin_ptrs);
@@ -216,7 +211,7 @@ func execute_entry_point{
         print(ids.syscall_ptr)
     %}
 
-    %{ vm_enter_scope({'syscall_handler': syscall_handler}) %}
+    %{ vm_enter_scope() %}
     call abs contract_entry_point;
     %{ vm_exit_scope() %}
 

cairo0-bootloader/execution/syscall_handler.py

@@ -0,0 +1,76 @@
+from typing import Iterable
+from starkware.starknet.core.os.syscall_handler import SyscallHandlerBase, OsExecutionHelper
+from starkware.cairo.lang.vm.relocatable import RelocatableValue, MaybeRelocatable
+from starkware.cairo.lang.vm.memory_segments import MemorySegmentManager
+
+class SyscallHandler(SyscallHandlerBase):
+    """
+    A handler for system calls; used by the BusinessLogic entry point execution.
+    """
+
+    def __init__(
+        self,
+        segments: MemorySegmentManager,
+    ):
+        super().__init__(segments=segments, initial_syscall_ptr=None)
+
+    def set_syscall_ptr(self, syscall_ptr: RelocatableValue):
+        assert self._syscall_ptr is None, "syscall_ptr is already set."
+        self._syscall_ptr = syscall_ptr
+
+    def allocate_segment(self, data: Iterable[MaybeRelocatable]) -> RelocatableValue:
+        segment_start = self.segments.add()
+        self.segments.write_arg(ptr=segment_start, arg=data)
+        return segment_start
+
+    def _allocate_segment_for_retdata(self):
+        # Implementation here
+        pass
+
+    def _call_contract_helper(self):
+        # Implementation here
+        pass
+
+    def _count_syscall(self):
+        # Implementation here
+        pass
+
+    def _deploy(self):
+        # Implementation here
+        pass
+
+    def _emit_event(self):
+        # Implementation here
+        pass
+
+    def _get_block_hash(self):
+        # Implementation here
+        pass
+
+    def _get_execution_info_ptr(self):
+        # Implementation here
+        pass
+
+    def _keccak(self):
+        # Implementation here
+        pass
+
+    def _replace_class(self):
+        # Implementation here
+        pass
+
+    def _send_message_to_l1(self):
+        # Implementation here
+        pass
+
+    def _storage_read(self):
+        # Implementation here
+        pass
+
+    def _storage_write(self):
+        # Implementation here
+        pass
+
+    def current_block_number(self):
+        # Implementation here
+        pass

cairo0-bootloader/setup.py

@@ -18,6 +18,7 @@
         "builtin_selection": ["*.cairo", "*/*.cairo"],
         "common.builtin_poseidon": ["*.cairo", "*/*.cairo"],
         "common": ["*.cairo", "*/*.cairo"],
+        "execution": ["*.cairo", "*/*.cairo"],
         "contract_class": ["*.cairo", "*/*.cairo"],
         "lang.compiler": ["cairo.ebnf", "lib/*.cairo"],
     },