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jumps encoded using 24 bits, not 19; blocks no longer aligned

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* libguile/_scm.h (SCM_OBJCODE_MINOR_VERSION): Bump.
* libguile/vm-i-system.c (FETCH_OFFSET, BR): Labels are no longer 8-byte
  aligned; instead, jumps are encoded into 3 bytes instead of 2.
  (br, br-if, br-if-not, br-if-eq, br-if-not-eq, br-if-null)
  (br-if-not-null, mv-call): Adapt for new length of br instructions (3
  bytes instead of 2).

* libguile/vm.c (really_make_boot_program): Adapt hand-coded bytecode
  for new offset regime.

* module/language/assembly.scm (align-block): No alignment necessary.

* module/language/assembly/compile-bytecode.scm (write-bytecode): Write
  out breaks as 24-bit relative jumps.
* module/language/assembly/decompile-bytecode.scm (decode-load-program):
  Decompile break instructions.
This commit is contained in:
Andy Wingo 2009-09-17 14:58:31 +02:00
parent f95f82f8e1
commit 97fcf583b7
6 changed files with 40 additions and 39 deletions
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5
libguile/vm.c
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@ -180,9 +180,8 @@ static SCM
really_make_boot_program (long nargs)
{
SCM u8vec;
scm_t_uint8 text[] = { scm_op_mv_call, 0, 0, 1,
scm_op_make_int8_1, scm_op_nop, scm_op_nop, scm_op_nop,
scm_op_halt };
scm_t_uint8 text[] = { scm_op_mv_call, 0, 0, 0, 1,
scm_op_make_int8_1, scm_op_halt };
struct scm_objcode *bp;
SCM ret;