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py2llvm: support break/return in try block

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This commit is contained in:
Sebastien Bourdeauducq 2014-09-26 19:21:49 +08:00
parent 8852dd394e
commit 20ca97485c
1 changed files with 20 additions and 4 deletions
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24
artiq/py2llvm/ast_body.py
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@ -44,6 +44,7 @@ class Visitor:
self.builder = builder
self._break_stack = []
self._eid_stack = []
self._exception_level_stack = [0]
# builder can be None for visit_expression
def visit_expression(self, node):
@ -206,6 +207,13 @@ class Visitor:
self.builder.position_at_end(merge_block)
def _enter_loop_body(self, break_block):
self._break_stack.append(break_block)
self._exception_level_stack.append(0)
def _leave_loop_body(self):
self._exception_level_stack.pop()
def _visit_stmt_While(self, node):
function = self.builder.basic_block.function
body_block = function.append_basic_block("w_body")
@ -217,9 +225,9 @@ class Visitor:
condition.auto_load(self.builder), body_block, else_block)
self.builder.position_at_end(body_block)
self._break_stack.append(merge_block)
self._enter_loop_body(merge_block)
self.visit_statements(node.body)
self._break_stack.pop()
self._leave_loop_body()
if not is_terminated(self.builder.basic_block):
condition = self.visit_expression(node.test).o_bool(self.builder)
self.builder.cbranch(
@ -248,9 +256,9 @@ class Visitor:
self.builder.position_at_end(body_block)
target.set_value(self.builder, itval)
self._break_stack.append(merge_block)
self._enter_loop_body(merge_block)
self.visit_statements(node.body)
self._break_stack.pop()
self._leave_loop_body()
if not is_terminated(self.builder.basic_block):
cont = it.o_next(self.builder)
self.builder.cbranch(
@ -264,6 +272,9 @@ class Visitor:
self.builder.position_at_end(merge_block)
def _visit_stmt_Break(self, node):
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])
def _visit_stmt_Return(self, node):
@ -271,6 +282,9 @@ class Visitor:
val = base_types.VNone()
else:
val = self.visit_expression(node.value)
exception_levels = sum(self._exception_level_stack)
if exception_levels:
self.env.build_pop(self.builder, exception_levels)
if isinstance(val, base_types.VNone):
self.builder.ret_void()
else:
@ -336,7 +350,9 @@ class Visitor:
self.builder.cbranch(exception_occured, exc_block, noexc_block)
self.builder.position_at_end(noexc_block)
self._exception_level_stack[-1] += 1
self.visit_statements(node.body)
self._exception_level_stack[-1] -= 1
if not is_terminated(self.builder.basic_block):
self.env.build_pop(self.builder, 1)
self.visit_statements(node.orelse)