# HG changeset patch
# User bobv
# Date 1294422294 18000
# Node ID 2f9d59b0fa5cfd102bb8dadc4f419539be1e9eb0
# Parent  36c186bcc0858bd0db50efcbcb6eb157daf09a07
7009268: guarantee(middle - slop > start) failed: need enough space to divide up
Summary: Codebuffer can overflow on test with large number of calls
Reviewed-by: dholmes, collins

diff -r 36c186bcc085 -r 2f9d59b0fa5c src/share/vm/c1/c1_Compilation.cpp
--- a/src/share/vm/c1/c1_Compilation.cpp	Mon Jan 03 14:09:11 2011 -0500
+++ b/src/share/vm/c1/c1_Compilation.cpp	Fri Jan 07 12:44:54 2011 -0500
@@ -245,7 +245,7 @@
 }
 
 
-void Compilation::setup_code_buffer(CodeBuffer* code, int call_stub_estimate) {
+bool Compilation::setup_code_buffer(CodeBuffer* code, int call_stub_estimate) {
   // Preinitialize the consts section to some large size:
   int locs_buffer_size = 20 * (relocInfo::length_limit + sizeof(relocInfo));
   char* locs_buffer = NEW_RESOURCE_ARRAY(char, locs_buffer_size);
@@ -253,15 +253,20 @@
                                         locs_buffer_size / sizeof(relocInfo));
   code->initialize_consts_size(Compilation::desired_max_constant_size());
   // Call stubs + two deopt handlers (regular and MH) + exception handler
-  code->initialize_stubs_size((call_stub_estimate * LIR_Assembler::call_stub_size) +
-                              LIR_Assembler::exception_handler_size +
-                              2 * LIR_Assembler::deopt_handler_size);
+  int stub_size = (call_stub_estimate * LIR_Assembler::call_stub_size) +
+                   LIR_Assembler::exception_handler_size +
+                   (2 * LIR_Assembler::deopt_handler_size);
+  if (stub_size >= code->insts_capacity()) return false;
+  code->initialize_stubs_size(stub_size);
+  return true;
 }
 
 
 int Compilation::emit_code_body() {
   // emit code
-  setup_code_buffer(code(), allocator()->num_calls());
+  if (!setup_code_buffer(code(), allocator()->num_calls())) {
+    BAILOUT_("size requested greater than avail code buffer size", 0);
+  }
   code()->initialize_oop_recorder(env()->oop_recorder());
 
   _masm = new C1_MacroAssembler(code());
diff -r 36c186bcc085 -r 2f9d59b0fa5c src/share/vm/c1/c1_Compilation.hpp
--- a/src/share/vm/c1/c1_Compilation.hpp	Mon Jan 03 14:09:11 2011 -0500
+++ b/src/share/vm/c1/c1_Compilation.hpp	Fri Jan 07 12:44:54 2011 -0500
@@ -192,7 +192,7 @@
     return desired_max_code_buffer_size() / 10;
   }
 
-  static void setup_code_buffer(CodeBuffer* cb, int call_stub_estimate);
+  static bool setup_code_buffer(CodeBuffer* cb, int call_stub_estimate);
 
   // timers
   static void print_timers();