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19025d77ad
Reorganized. Created a new top level include directory that will hold all of Trick's header files. Moved all of the Trick headers to this directory. Created a libexec directory that holds all of the executables that users don't need to execute directly. Changed all of the executables remaining in bin to start with "trick-". In the sim_services directories changed all source files to find the Trick headers in their new location. Since all of the include files are gone in sim_services, removed the src directories as well, moving all of the source files up a level. Moved the makefiles, docs, man, and other architecture independent files into a top level share directory. Renamed lib_${TRICK_HOST_CPU} to lib64 or lib depending on the platform we're currently on.
refs #63
84 lines
3.4 KiB
C
84 lines
3.4 KiB
C
#include "trick/attributes.h"
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#include "trick/bitfield_proto.h"
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/* Who is using this? (Alex 04/16/12) */
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void addr_bitfield(ATTRIBUTES *A, ATTRIBUTES *B, int field_count) {
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// A is last non-bit field in struct
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// B is bit field to process
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static int bitfield_offset, bitfield_bits_used ;
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static int misalign_bytes, prev_item_size;
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int used_bytes, ii, dims;
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int offset, item_size, item_bits ;
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int bitfield_max, bitfield_align;
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#define BITS_PER_BYTE 8
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// a null bitfield means 0 length - go to next bit container
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// field_count will be the container size in this case
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if (B==NULL) {
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bitfield_offset = bitfield_offset - (bitfield_offset % field_count) + field_count ;
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bitfield_bits_used = 0 ;
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prev_item_size = field_count;
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return ;
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}
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// offset is where bitfield group will start in struct
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if (A==NULL) {
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offset = 0 ;
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}
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else {
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// compute offset from previous struct field
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dims = 1;
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if (A->num_index > 0) {
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for (ii = 0; ii<A->num_index; ii++) dims *= A->index[ii].size;
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}
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offset = A->offset + (A->size * dims);
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}
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if (field_count==1) {
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// start of bitfield group
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bitfield_offset = offset ;
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bitfield_bits_used = 0 ;
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misalign_bytes = 0;
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}
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// backward compatibility: if started on even boundary, treat short same as int
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// current sim users expect shorts to be addressed and returned as ints
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// (i.e. any bitfield declared as short should not span a short boundary)
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// GOOD: short x:8; short y:4; short z:4;
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// BAD: short x:8; short y:6; short z:6;
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if ((B->size==sizeof(short)) && (bitfield_offset-misalign_bytes) % 2 == 0) {
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B->size = sizeof(int);
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}
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item_size = B->size ;
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item_bits = B->index[0].size ;
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bitfield_max = item_size * BITS_PER_BYTE ;
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if (field_count==1) {
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// when you start an int/short not on an int/short boundary, account for it as used bits
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misalign_bytes = (bitfield_offset % item_size);
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bitfield_bits_used = misalign_bytes * BITS_PER_BYTE;
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bitfield_offset -= misalign_bytes;
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prev_item_size = item_size;
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}
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if (item_size != prev_item_size) {
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// go to next bit container if bitfield different declared size than previous
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used_bytes = (bitfield_bits_used / BITS_PER_BYTE) + ((bitfield_bits_used % BITS_PER_BYTE) > 0);
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bitfield_offset += used_bytes;
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bitfield_align = (item_size > 1) && (bitfield_offset % 2); // on even boundary if not char
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bitfield_offset += bitfield_align;
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bitfield_bits_used = 0;
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misalign_bytes = 0;
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} else {
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// same declared size
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if (item_bits + bitfield_bits_used > bitfield_max) {
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// go to next bit container if it won't fit here
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bitfield_offset += item_size ;
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bitfield_bits_used = bitfield_max < bitfield_bits_used ? bitfield_bits_used-bitfield_max : 0 ;
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misalign_bytes = 0;
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}
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}
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B->offset = bitfield_offset ;
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B->index[0].start = bitfield_max - bitfield_bits_used - item_bits ;
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bitfield_bits_used += item_bits ;
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prev_item_size = item_size;
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}
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