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8157758: JDK9 does not compile on Linux with GCC 6.1 because left-shifting a negative number has undefined behavior #682

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8157758: JDK9 does not compile on Linux with GCC 6.1 because left-shifting a negative number has undefined behavior #682

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2 changes: 1 addition & 1 deletion hotspot/src/share/vm/code/dependencies.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -170,7 +170,7 @@ class Dependencies: public ResourceObj {
LG2_TYPE_LIMIT = 4, // assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT))

// handy categorizations of dependency types:
all_types = ((1 << TYPE_LIMIT) - 1) & ((-1) << FIRST_TYPE),
all_types = ((1 << TYPE_LIMIT) - 1) & ((~0u) << FIRST_TYPE),

non_klass_types = (1 << call_site_target_value),
klass_types = all_types & ~non_klass_types,
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2 changes: 1 addition & 1 deletion hotspot/src/share/vm/oops/cpCache.hpp
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Expand Up @@ -192,7 +192,7 @@ class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
field_index_mask = right_n_bits(field_index_bits),
parameter_size_bits = 8, // subset of field_index_mask, range is 0..255
parameter_size_mask = right_n_bits(parameter_size_bits),
option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask))
option_bits_mask = ~(((~0u) << tos_state_shift) | (field_index_mask | parameter_size_mask))
};

// specific bit definitions for the indices field:
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