Clear exceptions set during attempts to lazily optimize.

Resubmit of patch for issue 1145 with a few additions:
- Now also clears exceptions when calling Runtime_LazyRecompile.
- Sets function where parsing fails to not be optimizable.

BUG=v8:1145
TEST=test/mjsunit/regress/regress-1145.js

Review URL: http://codereview.chromium.org/6469050

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6945 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/handles.cc

@@ -863,10 +863,12 @@ bool CompileLazyInLoop(Handle<JSFunction> function,
 }
 
 
-bool CompileOptimized(Handle<JSFunction> function, int osr_ast_id) {
+bool CompileOptimized(Handle<JSFunction> function,
+                      int osr_ast_id,
+                      ClearExceptionFlag flag) {
   CompilationInfo info(function);
   info.SetOptimizing(osr_ast_id);
-  return CompileLazyHelper(&info, KEEP_EXCEPTION);
+  return CompileLazyHelper(&info, flag);
 }
 
 

src/handles.h

@@ -403,7 +403,9 @@ bool CompileLazy(Handle<JSFunction> function, ClearExceptionFlag flag);
 
 bool CompileLazyInLoop(Handle<JSFunction> function, ClearExceptionFlag flag);
 
-bool CompileOptimized(Handle<JSFunction> function, int osr_ast_id);
+bool CompileOptimized(Handle<JSFunction> function,
+                      int osr_ast_id,
+                      ClearExceptionFlag flag);
 
 class NoHandleAllocation BASE_EMBEDDED {
  public:

src/hydrogen.cc

@@ -4091,6 +4091,8 @@ bool HGraphBuilder::TryInline(Call* expr) {
       !Scope::Analyze(&inner_info)) {
     if (Top::has_pending_exception()) {
       SetStackOverflow();
+      // Stop trying to optimize and inline this function.
+      target->shared()->set_optimization_disabled(true);
     }
     return false;
   }

src/objects.cc

@@ -5476,9 +5476,11 @@ uint32_t JSFunction::SourceHash() {
 
 bool JSFunction::IsInlineable() {
   if (IsBuiltin()) return false;
+  SharedFunctionInfo* shared_info = shared();
   // Check that the function has a script associated with it.
-  if (!shared()->script()->IsScript()) return false;
-  Code* code = shared()->code();
+  if (!shared_info->script()->IsScript()) return false;
+  if (shared_info->optimization_disabled()) return false;
+  Code* code = shared_info->code();
   if (code->kind() == Code::OPTIMIZED_FUNCTION) return true;
   // If we never ran this (unlikely) then lets try to optimize it.
   if (code->kind() != Code::FUNCTION) return true;

src/runtime.cc

@@ -7020,7 +7020,7 @@ static MaybeObject* Runtime_LazyRecompile(Arguments args) {
     function->ReplaceCode(function->shared()->code());
     return function->code();
   }
-  if (CompileOptimized(function, AstNode::kNoNumber)) {
+  if (CompileOptimized(function, AstNode::kNoNumber, CLEAR_EXCEPTION)) {
     return function->code();
   }
   if (FLAG_trace_opt) {
@@ -7029,7 +7029,7 @@ static MaybeObject* Runtime_LazyRecompile(Arguments args) {
     PrintF(": optimized compilation failed]\n");
   }
   function->ReplaceCode(function->shared()->code());
-  return Failure::Exception();
+  return function->code();
 }
 
 
@@ -7189,7 +7189,8 @@ static MaybeObject* Runtime_CompileForOnStackReplacement(Arguments args) {
     // Try to compile the optimized code.  A true return value from
     // CompileOptimized means that compilation succeeded, not necessarily
     // that optimization succeeded.
-    if (CompileOptimized(function, ast_id) && function->IsOptimized()) {
+    if (CompileOptimized(function, ast_id, CLEAR_EXCEPTION) &&
+        function->IsOptimized()) {
       DeoptimizationInputData* data = DeoptimizationInputData::cast(
           function->code()->deoptimization_data());
       if (data->OsrPcOffset()->value() >= 0) {
@@ -7232,6 +7233,9 @@ static MaybeObject* Runtime_CompileForOnStackReplacement(Arguments args) {
     ASSERT(function->code()->kind() == Code::OPTIMIZED_FUNCTION);
     return Smi::FromInt(ast_id);
   } else {
+    if (function->IsMarkedForLazyRecompilation()) {
+      function->ReplaceCode(function->shared()->code());
+    }
     return Smi::FromInt(-1);
   }
 }

test/mjsunit/regress/regress-1145.js

+// Copyright 2011 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.
+
+// Flags: --opt-eagerly --debug-code --lazy
+
+// See: http://code.google.com/p/v8/issues/detail?id=1145
+// Should not throw a syntax error exception (change this if we make lazily
+// compiled functions with syntax errors into early errors).
+// Should not hit an assertion in debug mode.
+
+// A lazily compiled function with a syntax error that is attempted inlined
+// would set a pending exception that is then ignored (until it triggers
+// an assert).
+// This file must be at least 1024 bytes long to trigger lazy compilation.
+
+function f() { return 1; }
+
+// Must be lazy. Must throw SyntaxError during compilation.
+function fail() { continue; }
+
+function opt_me() {
+  var x = 1;
+  // Do lots of function calls and hope to be optimized.
+  for (var i = 0; i < 1000000; i++) {
+    x = f();
+  }
+  if (x == 0) fail();  // Hope to be inlined during optimization.
+}
+
+opt_me();