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py2llvm: support continue statement

This commit is contained in:
Sebastien Bourdeauducq 2014-09-27 00:27:11 +08:00
parent 89fdab2176
commit 4a5e398857
1 changed files with 34 additions and 16 deletions
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38
artiq/py2llvm/ast_body.py
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@ -43,6 +43,7 @@ class Visitor:
self.ns = ns
self.builder = builder
self._break_stack = []
self._continue_stack = []
self._active_exception_stack = []
self._exception_level_stack = [0]
@ -210,28 +211,35 @@ class Visitor:
self.builder.position_at_end(merge_block)
def _enter_loop_body(self, break_block):
def _enter_loop_body(self, break_block, continue_block):
self._break_stack.append(break_block)
self._continue_stack.append(continue_block)
self._exception_level_stack.append(0)
def _leave_loop_body(self):
self._exception_level_stack.pop()
self._continue_stack.pop()
self._break_stack.pop()
def _visit_stmt_While(self, node):
function = self.builder.basic_block.function
body_block = function.append_basic_block("w_body")
else_block = function.append_basic_block("w_else")
merge_block = function.append_basic_block("w_merge")
condition = self.visit_expression(node.test).o_bool(self.builder)
self.builder.cbranch(
condition.auto_load(self.builder), body_block, else_block)
continue_block = function.append_basic_block("w_continue")
merge_block = function.append_basic_block("w_merge")
self.builder.position_at_end(body_block)
self._enter_loop_body(merge_block)
self._enter_loop_body(merge_block, continue_block)
self.visit_statements(node.body)
self._leave_loop_body()
if not self._bb_terminated():
self.builder.branch(continue_block)
self.builder.position_at_end(continue_block)
condition = self.visit_expression(node.test).o_bool(self.builder)
self.builder.cbranch(
condition.auto_load(self.builder), body_block, merge_block)
@ -245,24 +253,28 @@ class Visitor:
def _visit_stmt_For(self, node):
function = self.builder.basic_block.function
body_block = function.append_basic_block("f_body")
else_block = function.append_basic_block("f_else")
merge_block = function.append_basic_block("f_merge")
it = self.visit_expression(node.iter)
target = self.visit_expression(node.target)
itval = it.get_value_ptr()
body_block = function.append_basic_block("f_body")
else_block = function.append_basic_block("f_else")
cont = it.o_next(self.builder)
self.builder.cbranch(
cont.auto_load(self.builder), body_block, else_block)
continue_block = function.append_basic_block("f_continue")
merge_block = function.append_basic_block("f_merge")
self.builder.position_at_end(body_block)
target.set_value(self.builder, itval)
self._enter_loop_body(merge_block)
self._enter_loop_body(merge_block, continue_block)
self.visit_statements(node.body)
self._leave_loop_body()
if not self._bb_terminated():
self.builder.branch(continue_block)
self.builder.position_at_end(continue_block)
cont = it.o_next(self.builder)
self.builder.cbranch(
cont.auto_load(self.builder), body_block, merge_block)
@ -274,11 +286,17 @@ class Visitor:
self.builder.position_at_end(merge_block)
def _visit_stmt_Break(self, node):
def _break_loop_body(self, target_block):
exception_levels = self._exception_level_stack[-1]
if exception_levels:
self.env.build_pop(self.builder, exception_levels)
self.builder.branch(self._break_stack[-1])
self.builder.branch(target_block)
def _visit_stmt_Break(self, node):
self._break_loop_body(self._break_stack[-1])
def _visit_stmt_Continue(self, node):
self._break_loop_body(self._continue_stack[-1])
def _visit_stmt_Return(self, node):
if node.value is None: