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This avoids having different values in different files, which wasn't useful.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This provides call/cc and makes 'stacks' visible to the application.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Instead of always returning 'nil', let while return the last body
value.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This lets all of these execute more than one sexpr, returning the
value of the last.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This saves a pile more use of the allocator by noting when frames have
not been referenced from another frame and freeing them when they go
out of scope. Frames with references are left to the allocator to deal
with.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This assumes that macros are all pure functions, which should be true
for syntactic macros.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Track freed cons cells and stack items from the eval process where
possible so that they can be re-used without needing to collect.
This dramatically reduces the number of collect calls.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This should make it quite a bit faster than doing one at a time.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This sticks a few globals past the end of the heap and then asks the
OS to save the heap. On restore, the heap is re-populated by the OS
and then various global variables reset.
Signed-off-by: Keith Packard <keithp@keithp.com>
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The memmove may be overlapping, so make sure it happens only once by
just checking whether move_size has been set, rather than looking at
ao_lisp_moving; that doesn't get set when moving a noted cons as that
still needs to be walked at a later time.
Fix up the various looping move functions to all use the same
pattern. Atom was busted.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Handle memory compaction in places where we've got pointers into the
heap across an allocation operation. Either re-compute the values from
managed global references or add new roots across the allocation.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Progn as a builtin will help with tail-recursion.
while provides for loops until tail-recursion works :-)
read and eval are kinda useful.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Needed an extra stack frame to stash the pre-macro state. This
simplified macro processing quite a bit; a macro now just evaluates
the function and then sends that result to be evaluated again.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Not working yet
Signed-off-by: Keith Packard <keithp@keithp.com>
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Use a boolean array to note cons cells which would otherwise recurse,
then loop until that array is empty.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Use global ao_lisp_stack instead of local stack so that gc
moves of that item work.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Failing this leads to broken formals chains
Signed-off-by: Keith Packard <keithp@keithp.com>
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Pass reference to move API so it can change the values in-place, then
let it return '1' when the underlying object has already been moved to
shorten GC times.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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Ad-hoc code was incomprehensible and I couldn't make 'cond' work, so
I'm starting over.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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This enables changing values of atoms declared as constants, should
enable lets, and with some work, even lexical scoping.
this required changing the constant computation to run
ao_lisp_collect() before dumping the block of constant data, and that
uncovered some minor memory manager bugs.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Along with other small fixes
Signed-off-by: Keith Packard <keithp@keithp.com>
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This makes all lisp objects use 16-bit ints for references so we can
hold more stuff in small amounts of memory. Also adds a separate
constant pool of lisp objects for builtins, initial atoms and constant
lisp code.
Now builds (and runs!) on the nucleo-32 boards.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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