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comparison src/cpu/x86/vm/macroAssembler_x86.cpp @ 17980:0bf37f737702

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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: twisti, kvn
author roland
date Tue, 01 Apr 2014 09:36:49 +0200
parents 78bbf4d43a14
children 52b4284cb496 b1bc1af04c6e
comparison
equal deleted inserted replaced
17978:ad51f24671c2 17980:0bf37f737702
1050 // At this point, (tmp-0) is the last address touched, so don't 1050 // At this point, (tmp-0) is the last address touched, so don't
1051 // touch it again. (It was touched as (tmp-pagesize) but then tmp 1051 // touch it again. (It was touched as (tmp-pagesize) but then tmp
1052 // was post-decremented.) Skip this address by starting at i=1, and 1052 // was post-decremented.) Skip this address by starting at i=1, and
1053 // touch a few more pages below. N.B. It is important to touch all 1053 // touch a few more pages below. N.B. It is important to touch all
1054 // the way down to and including i=StackShadowPages. 1054 // the way down to and including i=StackShadowPages.
1055 for (int i = 1; i <= StackShadowPages; i++) { 1055 for (int i = 1; i < StackShadowPages; i++) {
1056 // this could be any sized move but this is can be a debugging crumb 1056 // this could be any sized move but this is can be a debugging crumb
1057 // so the bigger the better. 1057 // so the bigger the better.
1058 movptr(Address(tmp, (-i*os::vm_page_size())), size ); 1058 movptr(Address(tmp, (-i*os::vm_page_size())), size );
1059 } 1059 }
1060 } 1060 }
6094 6094
6095 #endif // _LP64 6095 #endif // _LP64
6096 6096
6097 6097
6098 // C2 compiled method's prolog code. 6098 // C2 compiled method's prolog code.
6099 void MacroAssembler::verified_entry(int framesize, bool stack_bang, bool fp_mode_24b) { 6099 void MacroAssembler::verified_entry(int framesize, int stack_bang_size, bool fp_mode_24b) {
6100 6100
6101 // WARNING: Initial instruction MUST be 5 bytes or longer so that 6101 // WARNING: Initial instruction MUST be 5 bytes or longer so that
6102 // NativeJump::patch_verified_entry will be able to patch out the entry 6102 // NativeJump::patch_verified_entry will be able to patch out the entry
6103 // code safely. The push to verify stack depth is ok at 5 bytes, 6103 // code safely. The push to verify stack depth is ok at 5 bytes,
6104 // the frame allocation can be either 3 or 6 bytes. So if we don't do 6104 // the frame allocation can be either 3 or 6 bytes. So if we don't do
6105 // stack bang then we must use the 6 byte frame allocation even if 6105 // stack bang then we must use the 6 byte frame allocation even if
6106 // we have no frame. :-( 6106 // we have no frame. :-(
6107 assert(stack_bang_size >= framesize || stack_bang_size <= 0, "stack bang size incorrect");
6107 6108
6108 assert((framesize & (StackAlignmentInBytes-1)) == 0, "frame size not aligned"); 6109 assert((framesize & (StackAlignmentInBytes-1)) == 0, "frame size not aligned");
6109 // Remove word for return addr 6110 // Remove word for return addr
6110 framesize -= wordSize; 6111 framesize -= wordSize;
6112 stack_bang_size -= wordSize;
6111 6113
6112 // Calls to C2R adapters often do not accept exceptional returns. 6114 // Calls to C2R adapters often do not accept exceptional returns.
6113 // We require that their callers must bang for them. But be careful, because 6115 // We require that their callers must bang for them. But be careful, because
6114 // some VM calls (such as call site linkage) can use several kilobytes of 6116 // some VM calls (such as call site linkage) can use several kilobytes of
6115 // stack. But the stack safety zone should account for that. 6117 // stack. But the stack safety zone should account for that.
6116 // See bugs 4446381, 4468289, 4497237. 6118 // See bugs 4446381, 4468289, 4497237.
6117 if (stack_bang) { 6119 if (stack_bang_size > 0) {
6118 generate_stack_overflow_check(framesize); 6120 generate_stack_overflow_check(stack_bang_size);
6119 6121
6120 // We always push rbp, so that on return to interpreter rbp, will be 6122 // We always push rbp, so that on return to interpreter rbp, will be
6121 // restored correctly and we can correct the stack. 6123 // restored correctly and we can correct the stack.
6122 push(rbp); 6124 push(rbp);
6123 // Remove word for ebp 6125 // Remove word for ebp