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comparison src/share/vm/opto/library_call.cpp @ 3742:b2cb497dec28

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7047069: Array can dynamically change size when assigned to an object field Summary: Fix initialization of a newly-allocated array with arraycopy Reviewed-by: never
author kvn
date Fri, 27 May 2011 12:47:48 -0700
parents e6d7eed3330c
children a92cdbac8b9e
comparison
equal deleted inserted replaced
3741:c76c13577460 3742:b2cb497dec28
5223 if (scale >= LogBytesPerLong) 5223 if (scale >= LogBytesPerLong)
5224 return false; // it is already a block transfer 5224 return false; // it is already a block transfer
5225 5225
5226 // Look at the alignment of the starting offsets. 5226 // Look at the alignment of the starting offsets.
5227 int abase = arrayOopDesc::base_offset_in_bytes(basic_elem_type); 5227 int abase = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
5228 const intptr_t BIG_NEG = -128; 5228
5229 assert(BIG_NEG + 2*abase < 0, "neg enough"); 5229 intptr_t src_off_con = (intptr_t) find_int_con(src_offset, -1);
5230 5230 intptr_t dest_off_con = (intptr_t) find_int_con(dest_offset, -1);
5231 intptr_t src_off = abase + ((intptr_t) find_int_con(src_offset, -1) << scale); 5231 if (src_off_con < 0 || dest_off_con < 0)
5232 intptr_t dest_off = abase + ((intptr_t) find_int_con(dest_offset, -1) << scale);
5233 if (src_off < 0 || dest_off < 0)
5234 // At present, we can only understand constants. 5232 // At present, we can only understand constants.
5235 return false; 5233 return false;
5234
5235 intptr_t src_off = abase + (src_off_con << scale);
5236 intptr_t dest_off = abase + (dest_off_con << scale);
5236 5237
5237 if (((src_off | dest_off) & (BytesPerLong-1)) != 0) { 5238 if (((src_off | dest_off) & (BytesPerLong-1)) != 0) {
5238 // Non-aligned; too bad. 5239 // Non-aligned; too bad.
5239 // One more chance: Pick off an initial 32-bit word. 5240 // One more chance: Pick off an initial 32-bit word.
5240 // This is a common case, since abase can be odd mod 8. 5241 // This is a common case, since abase can be odd mod 8.