Mercurial > hg > graal-jvmci-8
comparison src/os_cpu/linux_sparc/vm/assembler_linux_sparc.cpp @ 237:1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
Summary: allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check
Reviewed-by: kvn, jmasa, phh, jcoomes
| author | coleenp |
|---|---|
| date | Sat, 19 Jul 2008 17:38:22 -0400 |
| parents | d1605aabd0a1 |
| children | c18cbe5936b8 |
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| 235:9c2ecc2ffb12 | 237:1fdb98a17101 |
|---|---|
| 25 #include "incls/_precompiled.incl" | 25 #include "incls/_precompiled.incl" |
| 26 #include "incls/_assembler_linux_sparc.cpp.incl" | 26 #include "incls/_assembler_linux_sparc.cpp.incl" |
| 27 | 27 |
| 28 #include <asm-sparc/traps.h> | 28 #include <asm-sparc/traps.h> |
| 29 | 29 |
| 30 bool MacroAssembler::needs_explicit_null_check(intptr_t offset) { | |
| 31 // Since the linux kernel resides at the low end of | |
| 32 // user address space, no null pointer check is needed. | |
| 33 return offset < 0 || offset >= 0x100000; | |
| 34 } | |
| 35 | |
| 36 void MacroAssembler::read_ccr_trap(Register ccr_save) { | 30 void MacroAssembler::read_ccr_trap(Register ccr_save) { |
| 37 // No implementation | 31 // No implementation |
| 38 breakpoint_trap(); | 32 breakpoint_trap(); |
| 39 } | 33 } |
| 40 | 34 |