src/cpu/sparc/vm/sharedRuntime_sparc.cpp

rev 6086 : 8032410: compiler/uncommontrap/TestStackBangRbp.java times out on Solaris-Sparc V9
Summary: make compiled code bang the stack by the worst case size of the interpreter frame at deoptimization points.
Reviewed-by:

*** 3353,3369 ****
    Register        O2UnrollBlock      = O2;
    Register        O3array            = O3;
    Register        O4array_size       = O4;
    Label           loop;
  
!   // Before we make new frames, check to see if stack is available.
!   // Do this after the caller's return address is on top of stack
    if (UseStackBanging) {
      // Get total frame size for interpreted frames
      __ ld(O2UnrollBlock, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes(), O4);
      __ bang_stack_size(O4, O3, G3_scratch);
    }
  
    __ ld(O2UnrollBlock, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes(), O4array_size);
    __ ld_ptr(O2UnrollBlock, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes(), G3pcs);
    __ ld_ptr(O2UnrollBlock, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes(), O3array);
  
--- 3353,3372 ----
    Register        O2UnrollBlock      = O2;
    Register        O3array            = O3;
    Register        O4array_size       = O4;
    Label           loop;
  
! #ifdef ASSERT
!   // Compilers generate code that bang the stack by as much as the
!   // interpreter would need. So this stack banging should never
!   // trigger a fault. Verify that it does not on non product builds.
    if (UseStackBanging) {
      // Get total frame size for interpreted frames
      __ ld(O2UnrollBlock, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes(), O4);
      __ bang_stack_size(O4, O3, G3_scratch);
    }
+ #endif
  
    __ ld(O2UnrollBlock, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes(), O4array_size);
    __ ld_ptr(O2UnrollBlock, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes(), G3pcs);
    __ ld_ptr(O2UnrollBlock, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes(), O3array);
  
*** 3407,3419 ****
--- 3410,3424 ----
  void SharedRuntime::generate_deopt_blob() {
    // allocate space for the code
    ResourceMark rm;
    // setup code generation tools
    int pad = VerifyThread ? 512 : 0;// Extra slop space for more verify code
+ #ifdef ASSERT
    if (UseStackBanging) {
      pad += StackShadowPages*16 + 32;
    }
+ #endif
  #ifdef _LP64
    CodeBuffer buffer("deopt_blob", 2100+pad, 512);
  #else
    // Measured 8/7/03 at 1212 in 32bit debug build (no VerifyThread)
    // Measured 8/7/03 at 1396 in 32bit debug build (VerifyThread)
*** 3630,3642 ****
--- 3635,3649 ----
  void SharedRuntime::generate_uncommon_trap_blob() {
    // allocate space for the code
    ResourceMark rm;
    // setup code generation tools
    int pad = VerifyThread ? 512 : 0;
+ #ifdef ASSERT
    if (UseStackBanging) {
      pad += StackShadowPages*16 + 32;
    }
+ #endif
  #ifdef _LP64
    CodeBuffer buffer("uncommon_trap_blob", 2700+pad, 512);
  #else
    // Measured 8/7/03 at 660 in 32bit debug build (no VerifyThread)
    // Measured 8/7/03 at 1028 in 32bit debug build (VerifyThread)