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frame-instruction-pointer is absolute; rewrite (system vm coverage)

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* libguile/frames.c (scm_frame_source): Instead of assuming that
  scm_frame_procedure is correct, use the IP to get the source.
  (scm_frame_instruction_pointer): Return an absolute value instead of
  assuming that slot 0 is correct.  (It isn't, when preparing for a tail
  call.)

* libguile/programs.h:
* libguile/programs.c (scm_find_source_for_addr): New internal helper.

* module/system/repl/debug.scm (print-registers): Readably print
  absolute instruction pointers.

* module/system/vm/coverage.scm: Complete rewrite to use absolute IP's.
  We can't assume that frame-procedure is cheap if it is correct, or
  correct if it is cheap.  Anyway using the address is better anyway.
  (coverage-data->lcov): Disable per-function info temporarily.
  (loaded-modules, module-procedures, closest-source-line)
  (closed-over-procedures): Remove these.  Instead of going from
  procedures to source info, now we go from ELF image to source info.

* module/system/vm/debug.scm (debug-context-length): New interface.

* module/system/vm/program.scm (source-for-addr): New internal helper.
This commit is contained in:
Andy Wingo 2013-11-07 23:03:45 +01:00
parent 72b82b0f21
commit 581a4eb82b
7 changed files with 204 additions and 220 deletions
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26
libguile/frames.c
View file

@ -104,18 +104,9 @@ SCM_DEFINE (scm_frame_source, "frame-source", 1, 0, 0,
"")
#define FUNC_NAME s_scm_frame_source
{
SCM proc;
SCM_VALIDATE_VM_FRAME (1, frame);
proc = scm_frame_procedure (frame);
if (SCM_PROGRAM_P (proc) || SCM_RTL_PROGRAM_P (proc))
return scm_program_source (scm_frame_procedure (frame),
scm_frame_instruction_pointer (frame),
SCM_UNDEFINED);
return SCM_BOOL_F;
return scm_find_source_for_addr (scm_frame_instruction_pointer (frame));
}
#undef FUNC_NAME
@ -254,22 +245,9 @@ SCM_DEFINE (scm_frame_instruction_pointer, "frame-instruction-pointer", 1, 0, 0,
"")
#define FUNC_NAME s_scm_frame_instruction_pointer
{
SCM program;
const struct scm_objcode *c_objcode;
SCM_VALIDATE_VM_FRAME (1, frame);
program = scm_frame_procedure (frame);
if (SCM_RTL_PROGRAM_P (program))
return scm_from_ptrdiff_t (SCM_VM_FRAME_IP (frame) -
(scm_t_uint8 *) SCM_RTL_PROGRAM_CODE (program));
if (!SCM_PROGRAM_P (program))
return SCM_INUM0;
c_objcode = SCM_PROGRAM_DATA (program);
return scm_from_unsigned_integer ((SCM_VM_FRAME_IP (frame)
- SCM_C_OBJCODE_BASE (c_objcode)));
return scm_from_uintptr_t ((scm_t_uintptr) SCM_VM_FRAME_IP (frame));
}
#undef FUNC_NAME