diff options
author | Koichi Sasada <ko1@atdot.net> | 2021-04-02 02:28:00 +0900 |
---|---|---|
committer | Koichi Sasada <ko1@atdot.net> | 2021-04-02 09:25:33 +0900 |
commit | ecfa8dcdbaf60cbe878389439de9ac94bc82e034 (patch) | |
tree | 96799499a1482fca420606ff98e648c1496ae917 | |
parent | c080bb2284c06fbc5e8090c27781228d487c4021 (diff) |
fix return from orphan Proc in lambda
A "return" statement in a Proc in a lambda like:
`lambda{ proc{ return }.call }`
should return outer lambda block. However, the inner Proc can become
orphan Proc from the lambda block. This "return" escape outer-scope
like method, but this behavior was decieded as a bug.
[Bug #17105]
This patch raises LocalJumpError by checking the proc is orphan or
not from lambda blocks before escaping by "return".
Most of tests are written by Jeremy Evans
https://github.com/ruby/ruby/pull/4223
Notes
Notes:
Merged: https://github.com/ruby/ruby/pull/4347
-rw-r--r-- | test/ruby/test_lambda.rb | 103 | ||||
-rw-r--r-- | vm_insnhelper.c | 38 |
2 files changed, 134 insertions, 7 deletions
diff --git a/test/ruby/test_lambda.rb b/test/ruby/test_lambda.rb index 8e460475c0..2c42b54edb 100644 --- a/test/ruby/test_lambda.rb +++ b/test/ruby/test_lambda.rb @@ -74,6 +74,109 @@ class TestLambdaParameters < Test::Unit::TestCase assert_raise(ArgumentError, bug9605) {proc(&plus).call [1,2]} end + def test_proc_inside_lambda_inside_method_return_inside_lambda_inside_method + def self.a + r = -> do + p = Proc.new{return :a} + p.call + end.call + end + assert_equal(:a, a) + + def self.b + r = lambda do + p = Proc.new{return :b} + p.call + end.call + end + assert_equal(:b, b) + end + + def test_proc_inside_lambda_inside_method_return_inside_lambda_outside_method + def self.a + r = -> do + p = Proc.new{return :a} + p.call + end + end + assert_equal(:a, a.call) + + def self.b + r = lambda do + p = Proc.new{return :b} + p.call + end + end + assert_equal(:b, b.call) + end + + def test_proc_inside_lambda_inside_method_return_outside_lambda_inside_method + def self.a + r = -> do + Proc.new{return :a} + end.call.call + end + assert_raise(LocalJumpError) {a} + + def self.b + r = lambda do + Proc.new{return :b} + end.call.call + end + assert_raise(LocalJumpError) {b} + end + + def test_proc_inside_lambda_inside_method_return_outside_lambda_outside_method + def self.a + r = -> do + Proc.new{return :a} + end + end + assert_raise(LocalJumpError) {a.call.call} + + def self.b + r = lambda do + Proc.new{return :b} + end + end + assert_raise(LocalJumpError) {b.call.call} + end + + def test_proc_inside_lambda2_inside_method_return_outside_lambda1_inside_method + def self.a + r = -> do + -> do + Proc.new{return :a} + end.call.call + end.call + end + assert_raise(LocalJumpError) {a} + + def self.b + r = lambda do + lambda do + Proc.new{return :a} + end.call.call + end.call + end + assert_raise(LocalJumpError) {b} + end + + def test_proc_inside_lambda_toplevel + assert_separately [], <<~RUBY + lambda{ + $g = proc{ return :pr } + }.call + begin + $g.call + rescue LocalJumpError + # OK! + else + raise + end + RUBY + end + def pass_along(&block) lambda(&block) end diff --git a/vm_insnhelper.c b/vm_insnhelper.c index 23b3c51bd5..854b8a9d33 100644 --- a/vm_insnhelper.c +++ b/vm_insnhelper.c @@ -1390,13 +1390,22 @@ vm_throw_start(const rb_execution_context_t *ec, rb_control_frame_t *const reg_c } else if (state == TAG_RETURN) { const VALUE *current_ep = GET_EP(); - const VALUE *target_lep = VM_EP_LEP(current_ep); + const VALUE *target_ep = NULL, *target_lep, *ep = current_ep; int in_class_frame = 0; int toplevel = 1; escape_cfp = reg_cfp; - while (escape_cfp < eocfp) { - const VALUE *lep = VM_CF_LEP(escape_cfp); + // find target_lep, target_ep + while (!VM_ENV_LOCAL_P(ep)) { + if (VM_ENV_FLAGS(ep, VM_FRAME_FLAG_LAMBDA) && target_ep == NULL) { + target_ep = ep; + } + ep = VM_ENV_PREV_EP(ep); + } + target_lep = ep; + + while (escape_cfp < eocfp) { + const VALUE *lep = VM_CF_LEP(escape_cfp); if (!target_lep) { target_lep = lep; @@ -1414,7 +1423,7 @@ vm_throw_start(const rb_execution_context_t *ec, rb_control_frame_t *const reg_c toplevel = 0; if (in_class_frame) { /* lambda {class A; ... return ...; end} */ - goto valid_return; + goto valid_return; } else { const VALUE *tep = current_ep; @@ -1422,7 +1431,12 @@ vm_throw_start(const rb_execution_context_t *ec, rb_control_frame_t *const reg_c while (target_lep != tep) { if (escape_cfp->ep == tep) { /* in lambda */ - goto valid_return; + if (tep == target_ep) { + goto valid_return; + } + else { + goto unexpected_return; + } } tep = VM_ENV_PREV_EP(tep); } @@ -1434,7 +1448,12 @@ vm_throw_start(const rb_execution_context_t *ec, rb_control_frame_t *const reg_c case ISEQ_TYPE_MAIN: if (toplevel) { if (in_class_frame) goto unexpected_return; - goto valid_return; + if (target_ep == NULL) { + goto valid_return; + } + else { + goto unexpected_return; + } } break; case ISEQ_TYPE_EVAL: @@ -1448,7 +1467,12 @@ vm_throw_start(const rb_execution_context_t *ec, rb_control_frame_t *const reg_c } if (escape_cfp->ep == target_lep && escape_cfp->iseq->body->type == ISEQ_TYPE_METHOD) { - goto valid_return; + if (target_ep == NULL) { + goto valid_return; + } + else { + goto unexpected_return; + } } escape_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(escape_cfp); |