compiler: make quoted functions independent of outer environment.

artiq/compiler/asttyped.py

@@ -29,6 +29,8 @@ class ClassDefT(ast.ClassDef):
     _types = ("constructor_type",)
 class FunctionDefT(ast.FunctionDef, scoped):
     _types = ("signature_type",)
+class QuotedFunctionDefT(FunctionDefT):
+    pass
 class ModuleT(ast.Module, scoped):
     pass
 

artiq/compiler/embedding.py

@@ -16,6 +16,7 @@ from Levenshtein import ratio as similarity, jaro_winkler
 from ..language import core as language_core
 from . import types, builtins, asttyped, prelude
 from .transforms import ASTTypedRewriter, Inferencer, IntMonomorphizer
+from .transforms.asttyped_rewriter import LocalExtractor
 
 
 def coredevice_print(x): print(x)
@@ -241,6 +242,35 @@ class StitchingASTTypedRewriter(ASTTypedRewriter):
         self.host_environment = host_environment
         self.quote = quote
 
+    def visit_quoted_function(self, node, function):
+        extractor = LocalExtractor(env_stack=self.env_stack, engine=self.engine)
+        extractor.visit(node)
+
+        # We quote the defaults so they end up in the global data in LLVM IR.
+        # This way there is no "life before main", i.e. they do not have to be
+        # constructed before the main translated call executes; but the Python
+        # semantics is kept.
+        defaults = function.__defaults__ or ()
+        quoted_defaults = []
+        for default, default_node in zip(defaults, node.args.defaults):
+            quoted_defaults.append(self.quote(default, default_node.loc))
+        node.args.defaults = quoted_defaults
+
+        node = asttyped.QuotedFunctionDefT(
+            typing_env=extractor.typing_env, globals_in_scope=extractor.global_,
+            signature_type=types.TVar(), return_type=types.TVar(),
+            name=node.name, args=node.args, returns=node.returns,
+            body=node.body, decorator_list=node.decorator_list,
+            keyword_loc=node.keyword_loc, name_loc=node.name_loc,
+            arrow_loc=node.arrow_loc, colon_loc=node.colon_loc, at_locs=node.at_locs,
+            loc=node.loc)
+
+        try:
+            self.env_stack.append(node.typing_env)
+            return self.generic_visit(node)
+        finally:
+            self.env_stack.pop()
+
     def visit_Name(self, node):
         typ = super()._try_find_name(node.id)
         if typ is not None:
@@ -562,7 +592,7 @@ class Stitcher:
             engine=self.engine, prelude=self.prelude,
             globals=self.globals, host_environment=host_environment,
             quote=self._quote)
-        function_node = asttyped_rewriter.visit(function_node)
+        function_node = asttyped_rewriter.visit_quoted_function(function_node, embedded_function)
 
         # Add it into our typedtree so that it gets inferenced and codegen'd.
         self._inject(function_node)

artiq/compiler/targets.py

@@ -94,6 +94,7 @@ class Target:
         llpassmgr.add_sroa_pass()
         llpassmgr.add_dead_code_elimination_pass()
         llpassmgr.add_gvn_pass()
+        llpassmgr.add_function_attrs_pass()
         llpassmgr.run(llmodule)
 
     def compile(self, module):

artiq/compiler/transforms/artiq_ir_generator.py

@@ -224,7 +224,7 @@ class ARTIQIRGenerator(algorithm.Visitor):
         finally:
             self.current_class = old_class
 
-    def visit_function(self, node, is_lambda, is_internal):
+    def visit_function(self, node, is_lambda=False, is_internal=False, is_quoted=False):
         if is_lambda:
             name = "lambda@{}:{}".format(node.loc.line(), node.loc.column())
             typ = node.type.find()
@@ -234,16 +234,24 @@ class ARTIQIRGenerator(algorithm.Visitor):
 
         try:
             defaults = []
-            for arg_name, default_node in zip(typ.optargs, node.args.defaults):
-                default = self.visit(default_node)
-                env_default_name = \
-                    self.current_env.type.add("$default." + arg_name, default.type)
-                self.append(ir.SetLocal(self.current_env, env_default_name, default))
-                defaults.append(env_default_name)
+            if not is_quoted:
+                for arg_name, default_node in zip(typ.optargs, node.args.defaults):
+                    default = self.visit(default_node)
+                    env_default_name = \
+                        self.current_env.type.add("$default." + arg_name, default.type)
+                    self.append(ir.SetLocal(self.current_env, env_default_name, default))
+                    def codegen_default(env_default_name):
+                        return lambda: self.append(ir.GetLocal(self.current_env, env_default_name))
+                    defaults.append(codegen_default(env_default_name))
+            else:
+                for default_node in node.args.defaults:
+                    def codegen_default(default_node):
+                        return lambda: self.visit(default_node)
+                    defaults.append(codegen_default(default_node))
 
             old_name, self.name = self.name, self.name + [name]
 
-            env_arg  = ir.EnvironmentArgument(self.current_env.type, "CLS")
+            env_arg  = ir.EnvironmentArgument(self.current_env.type, "ARG.ENV")
 
             old_args, self.current_args = self.current_args, {}
 
@@ -291,8 +299,8 @@ class ARTIQIRGenerator(algorithm.Visitor):
             self.append(ir.SetLocal(env, "$outer", env_arg))
             for index, arg_name in enumerate(typ.args):
                 self.append(ir.SetLocal(env, arg_name, args[index]))
-            for index, (arg_name, env_default_name) in enumerate(zip(typ.optargs, defaults)):
-                default = self.append(ir.GetLocal(self.current_env, env_default_name))
+            for index, (arg_name, codegen_default) in enumerate(zip(typ.optargs, defaults)):
+                default = codegen_default()
                 value = self.append(ir.Builtin("unwrap_or", [optargs[index], default],
                                                typ.optargs[arg_name]))
                 self.append(ir.SetLocal(env, arg_name, value))
@@ -320,14 +328,15 @@ class ARTIQIRGenerator(algorithm.Visitor):
         return self.append(ir.Closure(func, self.current_env))
 
     def visit_FunctionDefT(self, node):
-        func = self.visit_function(node, is_lambda=False,
-                                   is_internal=len(self.name) > 0 or '.' in node.name)
+        func = self.visit_function(node, is_internal=len(self.name) > 0)
         if self.current_class is None:
-            if node.name in self.current_env.type.params:
-                self._set_local(node.name, func)
+            self._set_local(node.name, func)
         else:
             self.append(ir.SetAttr(self.current_class, node.name, func))
 
+    def visit_QuotedFunctionDefT(self, node):
+        self.visit_function(node, is_internal=True, is_quoted=True)
+
     def visit_Return(self, node):
         if node.value is None:
             return_value = ir.Constant(None, builtins.TNone())
@@ -1676,7 +1685,7 @@ class ARTIQIRGenerator(algorithm.Visitor):
             offset   = 0
         elif types.is_method(callee.type):
             func     = self.append(ir.GetAttr(callee, "__func__",
-                                              name="{}.CLS".format(callee.name)))
+                                              name="{}.ENV".format(callee.name)))
             self_arg = self.append(ir.GetAttr(callee, "__self__",
                                               name="{}.SLF".format(callee.name)))
             fn_typ   = types.get_method_function(callee.type)

artiq/compiler/transforms/asttyped_rewriter.py

@@ -229,9 +229,7 @@ class ASTTypedRewriter(algorithm.Transformer):
         extractor = LocalExtractor(env_stack=self.env_stack, engine=self.engine)
         extractor.visit(node)
 
-        signature_type = self._try_find_name(node.name)
-        if signature_type is None:
-            signature_type = types.TVar()
+        signature_type = self._find_name(node.name, node.name_loc)
 
         node = asttyped.FunctionDefT(
             typing_env=extractor.typing_env, globals_in_scope=extractor.global_,

artiq/compiler/transforms/dead_code_eliminator.py

@@ -33,7 +33,7 @@ class DeadCodeEliminator:
                 # it also has to run after the interleaver, but interleaver
                 # doesn't like to work with IR before DCE.
                 if isinstance(insn, (ir.Phi, ir.Alloc, ir.GetAttr, ir.GetElem, ir.Coerce,
-                                     ir.Arith, ir.Compare, ir.Select, ir.Quote)) \
+                                     ir.Arith, ir.Compare, ir.Select, ir.Quote, ir.Closure)) \
                         and not any(insn.uses):
                     insn.erase()
                     modified = True

artiq/compiler/transforms/inferencer.py

@@ -1227,6 +1227,8 @@ class Inferencer(algorithm.Visitor):
             self._unify(node.signature_type, signature_type,
                         node.name_loc, None)
 
+    visit_QuotedFunctionDefT = visit_FunctionDefT
+
     def visit_ClassDefT(self, node):
         if any(node.decorator_list):
             diag = diagnostic.Diagnostic("error",

artiq/compiler/transforms/iodelay_estimator.py

@@ -142,6 +142,8 @@ class IODelayEstimator(algorithm.Visitor):
             body = node.body
         self.visit_function(node.args, body, node.signature_type.find(), node.loc)
 
+    visit_QuotedFunctionDefT = visit_FunctionDefT
+
     def visit_LambdaT(self, node):
         self.visit_function(node.args, node.body, node.type.find(), node.loc)
 

artiq/compiler/transforms/llvm_ir_generator.py

@@ -947,8 +947,8 @@ class LLVMIRGenerator:
                                                 name=insn.name)
         elif insn.op == "unwrap_or":
             lloptarg, lldefault = map(self.map, insn.operands)
-            llhas_arg = self.llbuilder.extract_value(lloptarg, 0)
-            llarg = self.llbuilder.extract_value(lloptarg, 1)
+            llhas_arg = self.llbuilder.extract_value(lloptarg, 0, name="opt.has")
+            llarg = self.llbuilder.extract_value(lloptarg, 1, name="opt.val")
             return self.llbuilder.select(llhas_arg, llarg, lldefault,
                                          name=insn.name)
         elif insn.op == "round":
@@ -1005,28 +1005,21 @@ class LLVMIRGenerator:
     def process_Closure(self, insn):
         llenv = self.map(insn.environment())
         llenv = self.llbuilder.bitcast(llenv, llptr, name="ptr.{}".format(llenv.name))
-        if insn.target_function.name in self.function_map.values():
-            # If this closure belongs to a quoted function, we assume this is the only
-            # time that the closure is created, and record the environment globally
-            llenvptr = self.get_or_define_global("E.{}".format(insn.target_function.name),
-                                                 llptr)
-            self.llbuilder.store(llenv, llenvptr)
-
+        llfun = self.map(insn.target_function)
         llvalue = ll.Constant(self.llty_of_type(insn.target_function.type), ll.Undefined)
         llvalue = self.llbuilder.insert_value(llvalue, llenv, 0)
-        llvalue = self.llbuilder.insert_value(llvalue, self.map(insn.target_function), 1,
-                                              name=insn.name)
+        llvalue = self.llbuilder.insert_value(llvalue, llfun, 1, name=insn.name)
         return llvalue
 
     def _prepare_closure_call(self, insn):
         llargs    = [self.map(arg) for arg in insn.arguments()]
         llclosure = self.map(insn.target_function())
-        llenv     = self.llbuilder.extract_value(llclosure, 0, name="env.call")
         if insn.static_target_function is None:
             llfun = self.llbuilder.extract_value(llclosure, 1,
                                                  name="fun.{}".format(llclosure.name))
         else:
             llfun = self.map(insn.static_target_function)
+        llenv     = self.llbuilder.extract_value(llclosure, 0, name="env.fun")
         return llfun, [llenv] + list(llargs)
 
     def _prepare_ffi_call(self, insn):
@@ -1315,13 +1308,8 @@ class LLVMIRGenerator:
 
     def process_Quote(self, insn):
         if insn.value in self.function_map:
-            func_name = self.function_map[insn.value]
-            llenvptr = self.get_or_define_global("E.{}".format(func_name), llptr)
-            llenv = self.llbuilder.load(llenvptr)
-            llfun = self.get_function(insn.type.find(), func_name)
-
+            llfun = self.get_function(insn.type.find(), self.function_map[insn.value])
             llclosure = ll.Constant(self.llty_of_type(insn.type), ll.Undefined)
-            llclosure = self.llbuilder.insert_value(llclosure, llenv, 0)
             llclosure = self.llbuilder.insert_value(llclosure, llfun, 1, name=insn.name)
             return llclosure
         else:

artiq/compiler/validators/escape.py

@@ -277,6 +277,8 @@ class EscapeValidator(algorithm.Visitor):
         self.visit_in_region(node, Region(node.loc), node.typing_env,
                              args={ arg.arg: Argument(arg.loc) for arg in node.args.args })
 
+    visit_QuotedFunctionDefT = visit_FunctionDefT
+
     def visit_ClassDefT(self, node):
         self.youngest_env[node.name] = self.youngest_region
         self.visit_in_region(node, Region(node.loc), node.constructor_type.attributes)

artiq/compiler/validators/monomorphism.py

@@ -24,6 +24,8 @@ class MonomorphismValidator(algorithm.Visitor):
                 node.name_loc, notes=[note])
             self.engine.process(diag)
 
+    visit_QuotedFunctionDefT = visit_FunctionDefT
+
     def generic_visit(self, node):
         super().generic_visit(node)