mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-15 17:33:38 +00:00
58e305e4c0
remaining part is the code generation for code that is to be spawned off. It
must be handled in the code generator since it uses the parent stack pointer in
many cases.
I'm committing this now so that Zoltan can begin to review it while I work on
the code generator component.
compiler/par_loop_control.m:
This new file contains the source-to-source part of the parallel loop
control transformation..
compiler/transform_hlds.m.
Include the par_loop_control module within the transform_hlds module.
compiler/mercury_compile_middle_passes.m:
Call the loop control transformation at stage 206 - after the dependant
parallel conjunction transformation.
Move the last call optimisation pass from stage 175 to 206 since it will
most-likely prevent loop control from working. Where both transformations
are applicable, the loop control transformation is preferred.
compiler/options.m:
Add new options for loop control.
compiler/handle_options.m:
Disable loop control if we're not in a grade that supports parallel
conjunctions.
Other tests that should have been testing for parallel conjunction support
but only tested parallel support have been fixed.
compiler/hlds_goal.m:
Add the feature_do_not_tailcall feature.
compiler/call_gen.m:
Mark LLCS call goals that may not have last call optimisation applied to
them if they have the feature_do_not_tailcall feature set in their HLDS
info.
compiler/goal_util.m:
Create a new predicate expand_plain_conj, this returns a list of the sub
goals of a plain conjunction, or returns the goal in a singleton list.
XXX: Could someone review the name of this predicate.
compiler/hlds_pred.m:
Add a symbol for the new transformation in the pred_transformation type.
Corrected a comment to match the arguments in the predicate it refers to.
compiler/prog_util.m:
Add support to make_pred_name for creating names for loop control
predicates.
compiler/dep_par_conj.m:
Fix grammer in a comment.
compiler/saved_vars.m:
Conform to the change in hlds_goal.m
compiler/layout_out.m:
Conform to the change in hlds_pred.m
runtime/mercury_par_builtin.[ch]:
Add support for lc_wait_free_slot/2, the blocking version of
lc_get_free_slot/2. This means that other loop control builtins have
changed, for instance, lc_join_and_terminate/2 must wake up a context
blocked in lc_wait_free_slot/2 after making the slot it was using free.
Use a spin lock in the loop control structure rather than a POSIX mutex.
runtime/mercury_wrapper.[ch]:
Add support for a runtime variable, the number of contexts per loop control.
This can be controlled with a MERCURY_OPTIONS option.
mdbcomp/program_representation.m:
Include lc_wait_free_slot/2 in the list of external predicates.
mdbcomp/mdbcomp.goal_path.m:
Add two new predicates goal_path_remove_first/3 and goal_path_get_first/2.
library/par_builtin.m:
Add new builtins to support the loop control transformation:
lc_wait_free_slot/2 will block the context until a new slot is
available.
lc_default_num_contexts/1 will return the number of contexts to use, by
default, for a loop-controlled loop.
Add myself as an author of this module.
doc/user_guide.texi:
Document the runtime --num-contexts-per-lc-per-thread option. It is
currently commented out since it is not intended for users, at least for
now.
Document the loop control options for the compiler.
---
The change below was written by Zoltan, I reviewed when I applied his diff to
my workspace.
Allow the compiler to mark calls in the LLDS as calls that cannot have last
call optimization applied to them. Paul will soon need this capability
in order to implement parallel conjunctions in which earlier conjuncts
are spawned off, and later conjuncts contain recursive calls, but the
earlier conjuncts need the stack frame.
compiler/llds.m:
Add a flag to det and semi calls. (Model_non calls have had a similar
flag for a long time, for a totally different reason.)
compiler/call_gen.m:
By default, say that det and semi calls may have LCO applied to them.
compiler/jumpopt.m:
Apply LCO to det and semi calls only if this flag allows it.
compiler/opt_debug.m:
Include the flag in debugging dumps.
This directory contains the source for The Mercury user's guide The Mercury language reference manual The Mercury library reference manual The Prolog to Mercury transition guide The Mercury frequently asked questions list The master copy of each document is stored in texinfo format, from which the info, dvi and html versions are derived automatically. You can create postscript versions from either the dvi or html versions. Due to the large spacing in texinfo-generated dvi files, the postscript file generated from the html (manually via a browser such as xmosaic) will be considerably shorter than the one derived from the dvi file. The source for the Mercury library reference manual is generated automatically from the library source files themselves.