From 2dd9717c4b3ff2383cfac0081f3e5e2982076545 Mon Sep 17 00:00:00 2001 From: "lrn@chromium.org" Date: Mon, 22 Jun 2009 12:36:01 +0000 Subject: [PATCH] Fix bug in static type inference for loops. Review URL: http://codereview.chromium.org/140058 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2236 ce2b1a6d-e550-0410-aec6-3dcde31c8c00 --- src/ia32/virtual-frame-ia32.cc | 4 ++- test/mjsunit/regress/regress-1919169.js | 40 +++++++++++++++++++++++++ 2 files changed, 43 insertions(+), 1 deletion(-) create mode 100644 test/mjsunit/regress/regress-1919169.js diff --git a/src/ia32/virtual-frame-ia32.cc b/src/ia32/virtual-frame-ia32.cc index 3d97a66fa..1a50b27e3 100644 --- a/src/ia32/virtual-frame-ia32.cc +++ b/src/ia32/virtual-frame-ia32.cc @@ -220,7 +220,9 @@ void VirtualFrame::MakeMergable() { } // No need to set the copied flag---there are no copies of // copies or constants so the original was not copied. - elements_[i].set_static_type(element.static_type()); + + // Backwards jump targets can never know the type of a value. + elements_[i].set_static_type(StaticType::unknown()); } else { // Clear the copy flag of non-constant, non-copy elements above // the high water mark. They cannot be copied because copes are diff --git a/test/mjsunit/regress/regress-1919169.js b/test/mjsunit/regress/regress-1919169.js new file mode 100644 index 000000000..774f26558 --- /dev/null +++ b/test/mjsunit/regress/regress-1919169.js @@ -0,0 +1,40 @@ +// Copyright 2008 the V8 project authors. All rights reserved. +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following +// disclaimer in the documentation and/or other materials provided +// with the distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + +function test() { + var s2 = "s2"; + for (var i = 0; i < 2; i++) { + // Crashes in round i==1 with IllegalAccess in %StringAdd(x,y) + var res = 1 + s2; + s2 = 2; + } +} + +// Crash does not occur when code is run at the top level. +test(); + -- 2.34.1