Quoth gc_inline.h, which makes freelists:
/* Note that for these routines, it is the clients responsibility to */
/* add the extra byte at the end to deal with one-past-the-end pointers.*/
/* In the standard collector configuration, the collector assumes that */
/* such a byte has been added, and hence does not trace the last word */
/* in the resulting object. */
/* This is not an issue if the collector is compiled with */
/* DONT_ADD_BYTE_AT_END, or if GC_all_interior_pointers is not set. */
Previously, these instructions were compiled directly. However, the JIT
also wants to fuse comparisons with branches, and an intervening "drop"
breaks that. Instead we take a different approach and rely on the
compiler only emitting push/pop/drop in a peephole sort of way, and we
can just simulate the temp stack space and dispatch directly.
* libguile/jit.c (compile_push, compile_push_slow, compile_pop):
(compile_pop_slow, compile_drop, compile_drop_slow): Crash if these are
called.
(COMPILE_WIDE_OP1, COMPILE_WIDE_OP2, COMPILE_WIDE_OP3, COMPILE_WIDE_OP4)
(COMPILE_WIDE_OP5):
(COMPILE_WIDE_DOP1, COMPILE_WIDE_DOP2, COMPILE_WIDE_DOP3)
(COMPILE_WIDE_DOP4, COMPILE_WIDE_DOP5): New helpers. I didn't manage to
share implementation with COMPILE_*.
(COMPILE_WIDE_*): New variants of compilers that take their operands
from an array instead of parsing the inline operands, relying on
convention for how the compiler emits these instructions.
(parse_wide_operands): New helper to parse out "wide" operands.
(compile1, compile_slow_path): If we see a "push", parse wide operands.
(compile): Move label capture for the slow path into compile_slow_path,
because wide operands may skip some instructions.
* libguile/jit.c (compile_*): Instead of using the minimum sized types
that can represent the instruction's operand, use uint32_t. This will
allow us to handle push/pop/drop without moving the SP.
* libguile/symbols.c (scm_symbol_to_string, scm_string_to_symbol):
Remove some confusing documentation that assumes that Guile is
case-insensitive, and which uses a word that may be perceived as a slur.
* module/ice-9/test.scm:
* test-suite/tests/r4rs.test: Rename a test to avoid using a slur.
* test-suite/tests/asyncs.test: Instead of wrapping abort-to-prompt with
false-if-exception, to handle edge cases, guard with
suspendable-continuation?: this also catches recursive invocations.
* module/language/tree-il/primitives.scm (*interesting-primitive-names*):
(*effect-free-primitives*): Recognize keyword->symbol, symbol->keyword.
* module/language/tree-il/cps-primitives.scm: Plumb through to CPS.
(keyword->symbol):
* module/language/cps/effects-analysis.scm: New prims have no effect.
Fix effects for string->symbol.
(annotation->memory-kind): Add keywords.
* module/language/cps/guile-vm/lower-primcalls.scm (keyword->symbol):
Lower to scm-ref/immediate.
* module/language/cps/types.scm (annotation->type): Add case for
keywords.
* module/language/tree-il/compile-cps.scm: Add converters for new prims,
with type guards.
These numeric predicates now have CPS branching primcalls, which allows
type inference and folding to reduce them to less-strong instructions.
* module/language/cps/effects-analysis.scm (heap-numbers-equal?): Put
all the number predicates together. None have type checks.
* module/language/cps/guile-vm/lower-primcalls.scm
(define-branching-primcall-alias): New helper.
(complex?): Same as number?.
* module/language/cps/guile-vm/lower-primcalls.scm (real?)
(rational?, integer?, exact-integer?, exact?, inexact?): Define
lowerers.
* module/language/cps/type-fold.scm (number?, complex?, real?)
(rational?, integer?, exact-integer?, exact?, inexact?): Add folders and
reducers for all of these.
* module/language/cps/type.scm (number?, complex?, real?)
(rational?, integer?, exact-integer?, exact?, inexact?): Add type
inference for these.
* module/language/tree-il/compile-cps.scm (convert): Add number? checks
before exact? and inexact?. Remove the eager lowering of
exact-integer?; instead rely on folders.
* module/language/tree-il/cps-primitives.scm (number?, complex?)
(real?, rational?, integer?, exact-integer?, exact?, inexact?): Add
primitive decls. Define as "number-type-predicates?", meaning they need
a number? guard.
* module/language/cps/effects-analysis.scm: Mark more predicates as
effect-free. Sort the list.
* module/language/cps/guile-vm/lower-primcalls.scm (procedure?): Reify a
call to a primitive. Sadly we can't elide the $kreceive, as even though
we know that it's single-valued, $call can't continue to $kargs (has to
be $callk). Perhaps is worth relaxing in the future.
* module/language/cps/type-fold.scm: Define a number of additional
folders for disjoint types.
(procedure?): Define a folder for &procedure. Has to include structs,
though.
* module/language/cps/types.scm: Same as for type-fold.scm.
* module/language/tree-il/cps-primitives.scm: Lower procedure? primcalls
to CPS.
* module/language/cps/utils.scm (primcall-raw-representations): Add
sadd, ssub, etc; these are lowered to uadd, usub, etc later for the
guile-vm target, but it is still useful to record their reprs for
pre-lowering analysis.
Recognize `raise-exception` in the same way we recognize `throw`, though
it is a bit less optimized and the boot story is not as complicated.
* doc/ref/vm.texi (Non-Local Control Flow Instructions):
* libguile/jit.c (compile_unreachable):
(compile_unreachable_slow):
* libguile/vm-engine.c (VM_NAME):
* module/language/cps/compile-bytecode.scm (compile-function):
* module/system/vm/assembler.scm (emit-unreachable): Add new
"unreachable" instruction, inserted after a call to non-continuable
`raise-exception`.
* module/language/tree-il/compile-cps.scm (raise-exception):
* module/language/tree-il/primitives.scm
(*interesting-primitive-names*): Recognize raise-exception, and if it is
called with just one argument, prune that branch of the control-flow
graph.
* module/ice-9/pretty-print.scm (pretty-print): We were never indenting
more than 8 spaces. Doh!
* test-suite/tests/print.test (prints?, "pretty-print"): Add test.
* module/ice-9/boot-9.scm (define-inlinable):
* module/srfi/srfi-9.scm (define-tagged-inlinable): Add maybe-unused
declaration. Also require at least one body expr, otherwise the
metadata declaration could escape as the proc body.
* module/language/tree-il/analyze.scm (<reference-graph>): Oh my
goodness, constructor args were reversed relative to field order.
Constructor use was consistent but it was terribly confusing; fixed and
updated uses.
(unused-toplevel-analysis): Add ability for functions to mark themselves
as "maybe-unused"; such functions won't cause unused toplevel warnings.
* module/language/tree-il/compile-bytecode.scm (sanitize-meta):
(compile-closure):
* module/language/tree-il/compile-cps.scm (sanitize-meta): Prevent
maybe-unused from being needlessly written out to the binary.
* module/language/tree-il/compile-cps.scm
(define-custom-primcall-converter): New exported macro, handling
primcalls that need special logic. Fold "throw" and "values" into this
macro. The goal is to allow the Hoot compiler to specially convert an
"inline assembly" primcall.
* doc/r5rs/r5rs.texi: Revert c7d170c5d1,
as R5RS is a historical document, and our packaging of it is something
that other people rely on. See also
7fb9c4aff2 when I was also bitten by this
error!
* module/language/cps/utils.scm (primcall-raw-representations): New
function.
(compute-var-representations): Use #:primcall-raw-representations
keyword arg, which defaults to primcall-raw-representations.
* module/language/cps/utils.scm (compute-var-representations): $code
makes a 'code. bv-contents makes a 'bv-contents.
* module/language/cps/slot-allocation.scm:
* module/language/cps/hoot/tailify.scm:
* module/system/vm/assembler.scm: Adapt.
* module/language/cps/utils.scm (compute-defs-and-uses): Add $prim.
Wasn't needed before because this function was only ever called after
reify-primitives.
* module/language/cps/closure-conversion.scm (convert-one): Add nfree to
the param. This will help the wasm target.
* module/language/cps/effects-analysis.scm (closure-ref, closure-set!):
* module/language/cps/lower-primcalls.scm (closure-ref,closure-set!):
Adapt.
* module/system/base/target.scm (target-runtime): New export.
* module/language/cps/optimize.scm (make-cps-lowerer): Load a
backend-specific lowering module dynamically.
* module/language/cps/guile-vm.scm: New module for lowering to Guile's
VM.
* module/language/cps/guile-vm/loop-instrumentation.scm:
* module/language/cps/guile-vm/lower-primcalls.scm:
* module/language/cps/guile-vm/reify-primitives.scm: Move here, from
parent dir.
* am/bootstrap.am: Update for new file list.
