1 /*
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25 
26 #ifndef CPU_RISCV_GLOBALS_RISCV_HPP
27 #define CPU_RISCV_GLOBALS_RISCV_HPP
28 
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/macros.hpp"
31 
32 // Sets the default values for platform dependent flags used by the runtime system.
33 // (see globals.hpp)
34 
35 define_pd_global(bool, ImplicitNullChecks,       true);  // Generate code for implicit null checks
36 define_pd_global(bool, TrapBasedNullChecks,      false);
37 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs past to check cast
38 
39 define_pd_global(uintx, CodeCacheSegmentSize,    64 COMPILER1_AND_COMPILER2_PRESENT(+64)); // Tiered compilation has large code-entry alignment.
40 define_pd_global(intx, CodeEntryAlignment,       64);
41 define_pd_global(intx, OptoLoopAlignment,        16);
42 
43 #define DEFAULT_STACK_YELLOW_PAGES (2)
44 #define DEFAULT_STACK_RED_PAGES (1)
45 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
46 // stack if compiled for unix and LP64. To pass stack overflow tests we need
47 // 20 shadow pages.
48 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+5))
49 #define DEFAULT_STACK_RESERVED_PAGES (1)
50 
51 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
52 #define MIN_STACK_RED_PAGES    DEFAULT_STACK_RED_PAGES
53 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
54 #define MIN_STACK_RESERVED_PAGES (0)
55 
56 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
57 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
58 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
59 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
60 
61 define_pd_global(bool, RewriteBytecodes,     true);
62 define_pd_global(bool, RewriteFrequentPairs, true);
63 
64 define_pd_global(bool, PreserveFramePointer, false);
65 
66 define_pd_global(uintx, TypeProfileLevel, 111);
67 
68 define_pd_global(bool, CompactStrings, true);
69 
70 // Clear short arrays bigger than one word in an arch-specific way
71 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
72 
73 define_pd_global(intx, InlineSmallCode,          1000);
74 
75 #define ARCH_FLAGS(develop,                                                      \
76                    product,                                                      \
77                    notproduct,                                                   \
78                    range,                                                        \
79                    constraint)                                                   \
80                                                                                  \
81   product(bool, NearCpool, true,                                                 \
82          "constant pool is close to instructions")                               \
83   product(intx, BlockZeroingLowLimit, 256,                                       \
84           "Minimum size in bytes when block zeroing will be used")               \
85           range(1, max_jint)                                                     \
86   product(bool, TraceTraps, false, "Trace all traps the signal handler")         \
87   /* For now we're going to be safe and add the I/O bits to userspace fences. */ \
88   product(bool, UseConservativeFence, true,                                      \
89           "Extend i for r and o for w in the pred/succ flags of fence;"          \
90           "Extend fence.i to fence.i + fence.")                                  \
91   product(bool, AvoidUnalignedAccesses, true,                                    \
92           "Avoid generating unaligned memory accesses")                          \
93   product(bool, UseRVV, false, EXPERIMENTAL, "Use RVV instructions")             \
94   product(bool, UseRVB, false, EXPERIMENTAL, "Use RVB instructions")             \
95   product(bool, UseRVC, false, EXPERIMENTAL, "Use RVC instructions")             \
96   product(bool, UseRVVForBigIntegerShiftIntrinsics, true,                        \
97           "Use RVV instructions for left/right shift of BigInteger")
98 #endif // CPU_RISCV_GLOBALS_RISCV_HPP