89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/**
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* environment/environment.c
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*
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* Initialise a MINIMAL environment.
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*
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* (c) 2026 Simon Brooke <simon@journeyman.cc>
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* Licensed under GPL version 2.0, or, at your option, any later version.
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*/
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#include <stdbool.h>
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#include "debug.h"
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#include "memory/memory.h"
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#include "memory/node.h"
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#include "memory/pointer.h"
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#include "memory/pso.h"
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#include "memory/pso2.h"
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#include "memory/tags.h"
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#include "ops/bind.h"
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#include "ops/string_ops.h"
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#include "payloads/cons.h"
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#include "payloads/exception.h"
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#include "payloads/psse_string.h"
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/**
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* @brief Flag to prevent re-initialisation.
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*/
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bool environment_initialised = false;
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/**
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* @brief Initialise a minimal environment, so that Lisp can be bootstrapped.
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*
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* @param node theindex of the node we are initialising.
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* @return struct pso_pointer t on success, else an exception.
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*/
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struct pso_pointer initialise_environment( uint32_t node ) {
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struct pso_pointer result = initialise_memory( node );
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if ( !exceptionp( result ) ) {
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debug_print( L"Initialising `nil`... ", DEBUG_BOOTSTRAP, 0);
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struct pso_pointer n = allocate( NILTAG, 2 );
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if ( ( n.page == 0 ) && ( n.offset == 0 ) ) {
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struct pso2 *object = pointer_to_object( n );
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object->payload.cons.car = nil;
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object->payload.cons.cdr = nil;
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nil = n;
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debug_print( L"success\n", DEBUG_BOOTSTRAP, 0);
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} else {
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result =
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make_exception( c_string_to_lisp_string
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( L"Unexpected cell while allocating `nil`." ),
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nil, n );
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debug_print( L"fail\n", DEBUG_BOOTSTRAP, 0);
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}
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}
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if ( !exceptionp( result ) ) {
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debug_print( L"Initialising `t`... ", DEBUG_BOOTSTRAP, 0);
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struct pso_pointer n = allocate( TRUETAG, 2 );
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if ( ( n.page == 0 ) && ( n.offset == 1 ) ) {
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struct pso2 *object = pointer_to_object( n );
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object->payload.string.character = L't';
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object->payload.cons.cdr = t;
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t = n;
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debug_print( L"success\n", DEBUG_BOOTSTRAP, 0);
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} else {
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result =
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make_exception( c_string_to_lisp_string
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( L"Unexpected cell while allocating `t`." ),
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nil, n );
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debug_print( L"fail\n", DEBUG_BOOTSTRAP, 0);
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}
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}
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if ( !exceptionp( result ) ) {
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result = c_bind( c_string_to_lisp_symbol( L"nil" ), nil, nil );
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result = c_bind( c_string_to_lisp_symbol( L"t" ), t, result );
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environment_initialised = true;
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}
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return result;
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}
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