From df0d6a4503a26508553510b4050eaa79f52e4e4e Mon Sep 17 00:00:00 2001
From: Aleksey Veresov <aleksey@veresov.pro>
Date: Sun, 18 Oct 2020 18:22:31 +0300
Subject: Another step to release.

---
 base/strans.c | 652 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 652 insertions(+)
 create mode 100644 base/strans.c

(limited to 'base/strans.c')

diff --git a/base/strans.c b/base/strans.c
new file mode 100644
index 0000000..e3d834d
--- /dev/null
+++ b/base/strans.c
@@ -0,0 +1,652 @@
+/*
+	Simple Stack Translator
+	created by exegete
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+struct stack_elem
+{
+	unsigned long long value;
+	struct stack_elem *next;
+};
+
+struct identifier
+{
+	const char *lexem;
+	unsigned long long value;
+	struct identifier *next;
+};
+
+struct segment
+{
+	char *buffer;
+	unsigned long long real_size;
+	unsigned long long size;
+	unsigned long long pointer_address;
+	unsigned long long base_address;
+	unsigned long long base_offset;
+	int data_size;
+	int data_endianness;
+	struct segment *next;
+};
+
+struct environment
+{
+	struct stack_elem *stack;
+	struct identifier *id_list;
+	struct segment *seg_list;
+	unsigned long long chosen_segment;
+};
+
+struct operator
+{
+	void (*func)(struct environment *env);
+	const char *lexem;
+};
+
+#define ERROR_STATUS_STACK_OVERFLOW 1
+#define ERROR_STATUS_STACK_EMPTY 2
+#define ERROR_STATUS_ID_LIST_OVERFLOW 3
+#define ERROR_STATUS_SEG_LIST_OVERFLOW 4
+#define ERROR_STATUS_INVALID_SEGMENT 5
+#define ERROR_STATUS_WORD_BUFFER_OVERFLOW 6
+#define ERROR_STATUS_LEXEM_OVERFLOW 7
+#define ERROR_STATUS_UNDEFINED 8
+#define ERROR_STATUS_INVALID_ACCESS 9
+#define ERROR_STATUS_INVALID_WORD_SIZE 10
+#define ERROR_STATUS_WORD_ENDIANNESS_INVALID 11
+
+const char *error_msgs[] =
+{
+	"Stack overflow",
+	"Stack is empty",
+	"Identifier list overflow",
+	"Segment list overflow",
+	"Invalid chosen segment",
+	"Word buffer overflow",
+	"Lexem is too big",
+	"Undefined lexem: ",
+	"Invalid segment access",
+	"Invalid segment data size",
+	"Invalid segment data endianness"
+};
+
+void exit_error(int status, const char *lexem)
+{
+	if(lexem)
+		fprintf(stderr, "Error: %s%s\n", error_msgs[status - 1],
+			lexem);
+	else
+		fprintf(stderr, "Error: %s\n", error_msgs[status - 1]);
+	exit(status);
+}
+
+unsigned long long create_segment(struct environment *env)
+{
+	struct segment **chosen_segment = &env->seg_list;
+	unsigned long long segment_counter = 0;
+	for(; *chosen_segment; chosen_segment = &(*chosen_segment)->next)
+		segment_counter++;
+	*chosen_segment = malloc(sizeof(struct segment));
+	if(!*chosen_segment)
+		exit_error(ERROR_STATUS_SEG_LIST_OVERFLOW, NULL);
+	(*chosen_segment)->buffer = NULL;
+	(*chosen_segment)->real_size = 0;
+	(*chosen_segment)->size = 0;
+	(*chosen_segment)->pointer_address = 0;
+	(*chosen_segment)->base_address = 0;
+	(*chosen_segment)->base_offset = 0;
+	(*chosen_segment)->data_size = 1;
+	(*chosen_segment)->data_endianness = 0;
+	(*chosen_segment)->next = NULL;
+	return segment_counter;
+}
+
+struct segment *get_segment(struct environment *env)
+{
+	struct segment *chosen_segment = env->seg_list;
+	unsigned long long segment_counter = env->chosen_segment;
+	while(chosen_segment && segment_counter--)
+		chosen_segment = chosen_segment->next;
+	if(!chosen_segment)
+		exit_error(ERROR_STATUS_INVALID_SEGMENT, NULL);
+	return chosen_segment;
+}
+
+void initialize_environment(struct environment *env)
+{
+	env->stack = NULL;
+	env->id_list = NULL;
+	env->seg_list = NULL;
+	env->chosen_segment = 0;
+}
+
+int is_separator(int symb)
+{
+	return symb == ' ' || symb == '\n' || symb == '\t' || symb == '\r';
+}
+
+#define BUFFER_INITIAL_SIZE 4
+
+int double_buffer(char **buffer, unsigned long long *buffer_size)
+{
+	char *tmp_pointer = *buffer;
+	unsigned long long tmp_size = *buffer_size;
+
+	if(*buffer_size == 0)
+		*buffer_size = BUFFER_INITIAL_SIZE;
+	else
+		*buffer_size *= 2;
+
+	*buffer = malloc(*buffer_size);
+	if(!*buffer)
+		return 0;
+
+	for(; tmp_size > 0; tmp_size--)
+		(*buffer)[tmp_size - 1] = tmp_pointer[tmp_size - 1];
+
+	free(tmp_pointer);
+	return 1;
+}
+
+char *read_lexem()
+{
+	char *buffer = NULL;
+	unsigned long long buffer_size = 0;
+	int symb;
+	unsigned long long index;
+
+	while(is_separator(symb = getchar()))
+	{}
+
+	if(symb == EOF)
+		return NULL;
+
+	for(index = 0;; index++)
+	{
+		if(index == buffer_size)
+			if(!double_buffer(&buffer, &buffer_size))
+				exit_error(ERROR_STATUS_LEXEM_OVERFLOW, NULL);
+		if(symb == EOF || is_separator(symb))
+		{
+			buffer[index] = 0;
+			break;
+		}
+		buffer[index] = symb;
+		symb = getchar();
+	}
+	return buffer;
+}
+
+void push_stack_elem(struct stack_elem **stack, unsigned long long value)
+{
+	struct stack_elem *head = *stack;
+	*stack = malloc(sizeof(struct stack_elem));
+	if(!*stack)
+		exit_error(ERROR_STATUS_STACK_OVERFLOW, NULL);
+	(*stack)->value = value;
+	(*stack)->next = head;
+}
+
+unsigned long long pop_stack_elem(struct stack_elem **stack)
+{
+	struct stack_elem *head = *stack;
+	unsigned long long value;
+	if(!head)
+		exit_error(ERROR_STATUS_STACK_EMPTY, NULL);
+	value = head->value;
+	*stack = head->next;
+	free(head);
+	return value;
+}
+
+int is_symb_hex(char symb)
+{
+	if(symb >= '0' && symb <= '9')
+		return symb - '0';
+	else
+	if(symb >= 'A' && symb <= 'F')
+		return symb - 'A' + 10;
+	else
+	if(symb >= 'a' && symb <= 'f')
+		return symb - 'a' + 10;
+	else
+		return -1;
+}
+
+int is_lexem_hex(struct environment *env, const char *lexem)
+{
+	int sign = 0;
+	unsigned long long hex = 0;
+	if(*lexem == '-' && *(lexem + 1))
+	{
+		sign = 1;
+		lexem++;
+	}
+
+	for(; *lexem; lexem++)
+	{
+		int num = is_symb_hex(*lexem);
+		if(num != -1)
+			hex = (hex << 4) + num;
+		else
+			return 0;
+	}
+	hex = sign ? ~hex + 1 : hex;
+	push_stack_elem(&env->stack, hex);
+	return 1;
+}
+
+int compare_lexems(const char *lexem_one, const char *lexem_two)
+{
+	for(; *lexem_one && *lexem_two; lexem_one++, lexem_two++)
+		if(*lexem_one != *lexem_two)
+			return 0;
+	return *lexem_one == *lexem_two;
+}
+
+void add_identifier(struct identifier **id_list, const char *lexem,
+	unsigned long long value)
+{
+	struct identifier *head = *id_list;
+	*id_list = malloc(sizeof(struct identifier));
+	if(!id_list)
+		exit_error(ERROR_STATUS_ID_LIST_OVERFLOW, NULL);
+	(*id_list)->lexem = lexem;
+	(*id_list)->value = value;
+	(*id_list)->next = head;
+}
+
+int find_identifier(struct environment *env, const char *lexem)
+{
+	struct identifier *id_list = env->id_list;
+	for(; id_list; id_list = id_list->next)
+	{
+		if(compare_lexems(lexem, id_list->lexem))
+		{
+			push_stack_elem(&env->stack, id_list->value);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+void segment_compile_byte(struct environment *env, char byte)
+{
+	unsigned long long index = get_segment(env)->size;
+	if(index == get_segment(env)->real_size)
+		if(!double_buffer(&get_segment(env)->buffer,
+			&get_segment(env)->real_size))
+			exit_error(ERROR_STATUS_WORD_BUFFER_OVERFLOW, NULL);
+	get_segment(env)->buffer[index] = byte;
+	get_segment(env)->size++;
+	get_segment(env)->pointer_address++;
+}
+
+void segment_compile(struct environment *env, unsigned long long value,
+	int size)
+{
+	int dir = get_segment(env)->data_endianness ? -1 : 1;
+	int index = get_segment(env)->data_endianness * (size - 1);
+	for(; index < size && index >= 0; index += dir)
+		segment_compile_byte(env, value >> index * 8);
+}
+
+unsigned long long convert_address(struct environment *env,
+	unsigned long long address, int size)
+{
+	unsigned long long pointer_address =
+		get_segment(env)->pointer_address;
+	unsigned long long base_address = get_segment(env)->base_address;
+	unsigned long long base_offset = get_segment(env)->base_offset;
+	if(address < base_address || address + size > pointer_address)
+		exit_error(ERROR_STATUS_INVALID_ACCESS, NULL);
+	return address - base_address + base_offset;
+}
+
+unsigned long long segment_read(struct environment *env,
+	unsigned long long address, int size)
+{
+	unsigned long long value = 0;
+	int dir = get_segment(env)->data_endianness ? 1 : -1;
+	int index = get_segment(env)->data_endianness ? 0 : (size - 1);
+	address = convert_address(env, address, size);
+	for(; index < size && index >= 0; index += dir)
+		value = (value << 8) +
+			(get_segment(env)->buffer[address + index] & 0xFF);
+	return value;
+}
+
+void segment_write(struct environment *env, unsigned long long value,
+	unsigned long long address, int size)
+{
+	int dir = get_segment(env)->data_endianness ? -1 : 1;
+	int index = get_segment(env)->data_endianness * (size - 1);
+	address = convert_address(env, address, size);
+	for(; index < size && index >= 0; index += dir)
+	{
+		get_segment(env)->buffer[address + index] = value;
+		value >>= 8;
+	}
+}
+
+void translator_drop(struct environment *env)
+{
+	pop_stack_elem(&env->stack);
+}
+
+void translator_dup(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, value);
+	push_stack_elem(&env->stack, value);
+}
+
+void translator_over(struct environment *env)
+{
+	unsigned long long value_one = pop_stack_elem(&env->stack);
+	unsigned long long value_two = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, value_two);
+	push_stack_elem(&env->stack, value_one);
+	push_stack_elem(&env->stack, value_two);
+}
+
+void translator_swap(struct environment *env)
+{
+	unsigned long long value_one = pop_stack_elem(&env->stack);
+	unsigned long long value_two = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, value_one);
+	push_stack_elem(&env->stack, value_two);
+}
+
+void translator_add(struct environment *env)
+{
+	unsigned long long first = pop_stack_elem(&env->stack);
+	unsigned long long second = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, second + first);
+}
+
+void translator_sub(struct environment *env)
+{
+	unsigned long long first = pop_stack_elem(&env->stack);
+	unsigned long long second = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, second - first);
+}
+
+void translator_mul(struct environment *env)
+{
+	unsigned long long first = pop_stack_elem(&env->stack);
+	unsigned long long second = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, second * first);
+}
+
+void translator_div(struct environment *env)
+{
+	unsigned long long first = pop_stack_elem(&env->stack);
+	unsigned long long second = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, second / first);
+}
+
+void translator_mod(struct environment *env)
+{
+	unsigned long long first = pop_stack_elem(&env->stack);
+	unsigned long long second = pop_stack_elem(&env->stack);
+	push_stack_elem(&env->stack, second % first);
+}
+
+void translator_define_identifier(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	add_identifier(&env->id_list, read_lexem(), value);
+}
+
+void translator_compile_one(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_compile(env, value, 1);
+}
+
+void translator_compile_two(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_compile(env, value, 2);
+}
+
+void translator_compile_four(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_compile(env, value, 4);
+}
+
+void translator_compile_eight(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_compile(env, value, 8);
+}
+
+void translator_compile(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_compile(env, value, get_segment(env)->data_size);
+}
+
+void translator_reserve(struct environment *env)
+{
+	unsigned long long count = pop_stack_elem(&env->stack);
+	while(count--)
+		segment_compile(env, 0, 1);
+}
+
+void translator_read_one(struct environment *env)
+{
+	unsigned long long value = segment_read(env,
+		pop_stack_elem(&env->stack), 1);
+	push_stack_elem(&env->stack, value);
+}
+
+void translator_read_two(struct environment *env)
+{
+	unsigned long long value = segment_read(env,
+		pop_stack_elem(&env->stack), 2);
+	push_stack_elem(&env->stack, value);
+}
+
+void translator_read_four(struct environment *env)
+{
+	unsigned long long value = segment_read(env,
+		pop_stack_elem(&env->stack), 4);
+	push_stack_elem(&env->stack, value);
+}
+
+void translator_read_eight(struct environment *env)
+{
+	unsigned long long value = segment_read(env,
+		pop_stack_elem(&env->stack), 8);
+	push_stack_elem(&env->stack, value);
+}
+
+void translator_read(struct environment *env)
+{
+	unsigned long long value = segment_read(env,
+		pop_stack_elem(&env->stack), get_segment(env)->data_size);
+	push_stack_elem(&env->stack, value);
+}
+
+void translator_write_one(struct environment *env)
+{
+	unsigned long long address = pop_stack_elem(&env->stack);
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_write(env, value, address, 1);
+}
+
+void translator_write_two(struct environment *env)
+{
+	unsigned long long address = pop_stack_elem(&env->stack);
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_write(env, value, address, 2);
+}
+
+void translator_write_four(struct environment *env)
+{
+	unsigned long long address = pop_stack_elem(&env->stack);
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_write(env, value, address, 4);
+}
+
+void translator_write_eight(struct environment *env)
+{
+	unsigned long long address = pop_stack_elem(&env->stack);
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_write(env, value, address, 8);
+}
+
+void translator_write(struct environment *env)
+{
+	unsigned long long address = pop_stack_elem(&env->stack);
+	unsigned long long value = pop_stack_elem(&env->stack);
+	segment_write(env, value, address, get_segment(env)->data_size);
+}
+
+void translator_create_segment(struct environment *env)
+{
+	push_stack_elem(&env->stack, create_segment(env));
+}
+
+void translator_choose_segment(struct environment *env)
+{
+	env->chosen_segment = pop_stack_elem(&env->stack);
+}
+
+void translator_set_base(struct environment *env)
+{
+	get_segment(env)->base_address = pop_stack_elem(&env->stack);
+	get_segment(env)->pointer_address = get_segment(env)->base_address;
+	get_segment(env)->base_offset = get_segment(env)->size;
+}
+
+#define WORD_SIZE_MAX 8
+
+void translator_set_data_size(struct environment *env)
+{
+	int target_size = pop_stack_elem(&env->stack);
+	if(target_size <= 0 || target_size > WORD_SIZE_MAX)
+		exit_error(ERROR_STATUS_INVALID_WORD_SIZE, NULL);
+	get_segment(env)->data_size = target_size;
+}
+
+void translator_set_data_endianness(struct environment *env)
+{
+	int endianness = pop_stack_elem(&env->stack);
+	if(endianness > 1)
+		exit_error(ERROR_STATUS_WORD_ENDIANNESS_INVALID, NULL);
+	get_segment(env)->data_endianness = endianness;
+}
+
+void translator_get_offset(struct environment *env)
+{
+	push_stack_elem(&env->stack, get_segment(env)->pointer_address);
+}
+
+void translator_get_base(struct environment *env)
+{
+	push_stack_elem(&env->stack, get_segment(env)->base_address);
+}
+
+void translator_print(struct environment *env)
+{
+	unsigned long long value = pop_stack_elem(&env->stack);
+	fprintf(stderr, "%llx\n", value);
+}
+
+const struct operator translator_operators[] =
+{
+	{ &translator_drop, "?drop" },
+	{ &translator_dup, "?dup" },
+	{ &translator_over, "?over" },
+	{ &translator_swap, "?swap" },
+	{ &translator_add, "?+" },
+	{ &translator_sub, "?-" },
+	{ &translator_mul, "?*" },
+	{ &translator_div, "?/" },
+	{ &translator_mod, "?mod" },
+	{ &translator_define_identifier, "??" },
+	{ &translator_compile_one, "?'" },
+	{ &translator_compile_one, "?1." },
+	{ &translator_compile_two, "?2." },
+	{ &translator_compile_four, "?4." },
+	{ &translator_compile_eight, "?8." },
+	{ &translator_compile, "?." },
+	{ &translator_reserve, "?res" },
+	{ &translator_read_one, "?1@" },
+	{ &translator_read_two, "?2@" },
+	{ &translator_read_four, "?4@" },
+	{ &translator_read_eight, "?8@" },
+	{ &translator_read, "?@" },
+	{ &translator_write_one, "?1!" },
+	{ &translator_write_two, "?2!" },
+	{ &translator_write_four, "?4!" },
+	{ &translator_write_eight, "?8!" },
+	{ &translator_write, "?!" },
+	{ &translator_create_segment, "?create" },
+	{ &translator_choose_segment, "?choose" },
+	{ &translator_set_base, "?org" },
+	{ &translator_set_data_size, "?size" },
+	{ &translator_set_data_endianness, "?endianness" },
+	{ &translator_get_offset, "?$" },
+	{ &translator_get_base, "?$$" },
+	{ &translator_print, "?print" },
+};
+
+int execute_operator(struct environment *env, const char *lexem)
+{
+	int operators_count =
+		sizeof(translator_operators) / sizeof(*translator_operators);
+	int index;
+
+	for(index = 0; index < operators_count; index++)
+	{
+		if(compare_lexems(lexem, translator_operators[index].lexem))
+		{
+			(*translator_operators[index].func)(env);
+			break;
+		}
+	}
+
+	return index != operators_count;
+}
+
+void print_target_buffer(struct environment *env)
+{
+	struct segment *seg_list;
+	unsigned long long index;
+	for(seg_list = env->seg_list; seg_list; seg_list = seg_list->next)
+		for(index = 0; index < seg_list->size; index++)
+			putchar(seg_list->buffer[index]);
+}
+
+int main()
+{
+	struct environment env;
+	char *lexem;
+
+	initialize_environment(&env);
+
+	for(;; free(lexem))
+	{
+		lexem = read_lexem();
+		if(!lexem)
+			break;
+		if(find_identifier(&env, lexem))
+			continue;
+		if(is_lexem_hex(&env, lexem))
+			continue;
+		if(!execute_operator(&env, lexem))
+			exit_error(ERROR_STATUS_UNDEFINED, lexem);
+	}
+
+	print_target_buffer(&env);
+
+	return 0;
+}
-- 
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