The procedure works as follows. First, cross compile ECL itself. In
this step, we dump the configuration of the compiler. This
configuration can then be later restored to put the host compiler into
cross compilation mode using a new option to WITH-COMPILATION-UNIT.
The following changes to the public interface are introduced:
- WITH-COMPILATION-UNIT now takes a new :target keyword
- New functions C:WRITE-TARGET-INFO, C:READ-TARGET-INFO to dump and
restore the config
- The environment parameters to TYPEP and SUBTYPEP are no longer
unused. User macros can query type relationships in the target
environment using these parameters.
Internal changes in the compiler include:
- Target dependent variables in the compiler are defined using a new
DEFCONFIG macro. C:WRITE-TARGET-INFO simply writes the value of
these variables to a file.
- The distinction between target types and host types already exists
in the compiler. In this commit, we just register the target types in
the compiler environment when we change the compiler configuration.
When a literal appears in the file multiple times its identity should be
preserved.
CLHS 3.2.4.4:
> If two literal objects appearing in the source code for a single
> file processed with the file compiler are the identical, the
> corresponding objects in the compiled code must also be the identical.
Previously, every bytecode object created during ext::bc-compile-file
had its own vector of constants making it impossible to satisfy this
constraint. Thus, we change ext::bc-compile-file to use the same
constants vector for all bytecode objects from the same file. The
simplest way to achieve this is to use the same compiler environment
for all of the compilation process and push the read-compile loop
into the si_bc_compile_from_stream function implemented in C.
bc-compile is more conforming now (we validate definition and name, also our
closure compilation is a bit better, still broken though).
Also improve some error messages and add periods at the end.
Both byte and C compilers didn't bind lexically *readtable*, what lead
to pollution of other compiled packages. Fixes#95 and #59.
Signed-off-by: Daniel Kochmański <daniel@turtleware.eu>
