Initial commit. Working interpreter a little optimized.
This commit is contained in:
commit
6538e1d7f3
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|
@ -0,0 +1,2 @@
|
|||
.ccls-cache
|
||||
build
|
||||
|
|
@ -0,0 +1,34 @@
|
|||
{
|
||||
// Use IntelliSense to learn about possible attributes.
|
||||
// Hover to view descriptions of existing attributes.
|
||||
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
|
||||
"version": "0.2.0",
|
||||
"configurations": [
|
||||
{
|
||||
"name": "(gdb) Launch",
|
||||
"type": "cppdbg",
|
||||
"request": "launch",
|
||||
"program": "${workspaceFolder}/build/brainfuck",
|
||||
"args": [
|
||||
"${workspaceFolder}/fibonacci.bf"
|
||||
],
|
||||
"stopAtEntry": false,
|
||||
"cwd": "${workspaceFolder}",
|
||||
"environment": [],
|
||||
"externalConsole": false,
|
||||
"MIMode": "gdb",
|
||||
"setupCommands": [
|
||||
{
|
||||
"description": "Enable pretty-printing for gdb",
|
||||
"text": "-enable-pretty-printing",
|
||||
"ignoreFailures": true
|
||||
},
|
||||
{
|
||||
"description": "Set Disassembly Flavor to Intel",
|
||||
"text": "-gdb-set disassembly-flavor intel",
|
||||
"ignoreFailures": true
|
||||
}
|
||||
]
|
||||
}
|
||||
]
|
||||
}
|
||||
|
|
@ -0,0 +1,117 @@
|
|||
{
|
||||
"version": "2.0.0",
|
||||
"tasks": [
|
||||
{
|
||||
"label": "Build",
|
||||
"detail": "Build project",
|
||||
"type": "shell",
|
||||
"command": "make",
|
||||
"args": [
|
||||
"-j$(nproc)"
|
||||
],
|
||||
"group": "build",
|
||||
"presentation": {
|
||||
"echo": true,
|
||||
"reveal": "always",
|
||||
"focus": true,
|
||||
"panel": "shared",
|
||||
"showReuseMessage": true,
|
||||
"clear": true
|
||||
}
|
||||
},
|
||||
{
|
||||
"label": "Clean",
|
||||
"detail": "Clean build directory",
|
||||
"type": "shell",
|
||||
"command": "make",
|
||||
"args": [
|
||||
"clean"
|
||||
],
|
||||
"group": "build",
|
||||
"presentation": {
|
||||
"echo": false,
|
||||
"reveal": "never",
|
||||
"focus": false,
|
||||
"panel": "shared",
|
||||
"showReuseMessage": false,
|
||||
"clear": true
|
||||
}
|
||||
},
|
||||
{
|
||||
"label": "Run",
|
||||
"detail": "Build project and run",
|
||||
"type": "shell",
|
||||
"command": "make",
|
||||
"args": [
|
||||
"-j$(nproc)",
|
||||
"run"
|
||||
],
|
||||
"group": "build",
|
||||
"presentation": {
|
||||
"echo": true,
|
||||
"reveal": "always",
|
||||
"focus": true,
|
||||
"panel": "shared",
|
||||
"showReuseMessage": true,
|
||||
"clear": true
|
||||
}
|
||||
},
|
||||
{
|
||||
"label": "Build Verbose",
|
||||
"detail": "Build project with verbosity on",
|
||||
"type": "shell",
|
||||
"command": "make",
|
||||
"args": [
|
||||
"VERBOSE=1"
|
||||
],
|
||||
"group": "build",
|
||||
"presentation": {
|
||||
"echo": true,
|
||||
"reveal": "always",
|
||||
"focus": true,
|
||||
"panel": "shared",
|
||||
"showReuseMessage": true,
|
||||
"clear": true
|
||||
}
|
||||
},
|
||||
{
|
||||
"label": "Build Debug",
|
||||
"detail": "Build project in debug mode",
|
||||
"type": "shell",
|
||||
"command": "make",
|
||||
"args": [
|
||||
"-j$(nproc)",
|
||||
"DEBUG=2"
|
||||
],
|
||||
"group": "build",
|
||||
"presentation": {
|
||||
"echo": true,
|
||||
"reveal": "always",
|
||||
"focus": true,
|
||||
"panel": "shared",
|
||||
"showReuseMessage": true,
|
||||
"clear": true
|
||||
}
|
||||
},
|
||||
{
|
||||
"label": "Run Debug",
|
||||
"detail": "Build project in debug mode and run",
|
||||
"type": "shell",
|
||||
"command": "make",
|
||||
"args": [
|
||||
"-j$(nproc)",
|
||||
"DEBUG=2",
|
||||
"run"
|
||||
],
|
||||
"group": "build",
|
||||
"presentation": {
|
||||
"echo": true,
|
||||
"reveal": "always",
|
||||
"focus": true,
|
||||
"panel": "shared",
|
||||
"showReuseMessage": true,
|
||||
"clear": true
|
||||
}
|
||||
}
|
||||
]
|
||||
}
|
||||
|
|
@ -0,0 +1,69 @@
|
|||
export
|
||||
|
||||
SHELL = /usr/bin/env bash
|
||||
|
||||
ROOT := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
|
||||
|
||||
#
|
||||
# User settings
|
||||
#
|
||||
|
||||
BUILD_DIR = build
|
||||
|
||||
SOURCE_DIR = src
|
||||
|
||||
OUTPUT = brainfuck
|
||||
|
||||
CC = gcc
|
||||
CFLAGS = --std=c17 -Os
|
||||
LD_FLAGS =
|
||||
|
||||
ifneq ($(DEBUG),)
|
||||
CFLAGS += -O0 -g -DDEBUG=$(DEBUG) -Wextra -Wall --pedantic -Wno-missing-braces \
|
||||
-Wno-missing-field-initializers -Wformat=2 -Wswitch-default -Wswitch \
|
||||
-Wcast-align -Wpointer-arith -Wbad-function-cast -Wstrict-overflow=5 \
|
||||
-Wstrict-prototypes -Winline -Wundef -Wnested-externs -Wcast-qual \
|
||||
-Wshadow -Wunreachable-code -Wlogical-op -Wfloat-equal -Wstrict-aliasing=2 \
|
||||
-Wredundant-decls -Wold-style-definition
|
||||
endif
|
||||
|
||||
#
|
||||
# End
|
||||
#
|
||||
|
||||
# Relocate vars
|
||||
BUILD_DIR := $(ROOT)/$(BUILD_DIR)
|
||||
|
||||
SOURCE_DIR := $(ROOT)/$(SOURCE_DIR)
|
||||
|
||||
OUTPUT := $(BUILD_DIR)/$(OUTPUT)
|
||||
|
||||
# Verbosity
|
||||
export Q := @
|
||||
ifeq ($(VERBOSE), 1)
|
||||
Q :=
|
||||
endif
|
||||
|
||||
# Colors
|
||||
GREEN := \033[32m
|
||||
YELLOW := \033[33m
|
||||
RESET := \033[m
|
||||
|
||||
# Default targets
|
||||
all: $(OUTPUT)
|
||||
|
||||
$(OUTPUT): FORCE
|
||||
$(Q)cd $(SOURCE_DIR) && $(MAKE) $@
|
||||
|
||||
FORCE:
|
||||
|
||||
clean:
|
||||
$(Q)rm -rf $(BUILD_DIR)
|
||||
|
||||
run: all
|
||||
$(Q)cd $(BUILD_DIR) && ./$(notdir $(OUTPUT))
|
||||
|
||||
print-var-% :
|
||||
@echo $($*)
|
||||
|
||||
.PHONY: clean run print-var-%
|
||||
|
|
@ -0,0 +1,6 @@
|
|||
>>>+[[-]>>[-]++>+>+++++++[<++++>>++<-]++>>+>+>+++++[>++>++++++<<-]+>>>,<++[[>[
|
||||
->>]<[>>]<<-]<[<]<+>>[>]>[<+>-[[<+>-]>]<[[[-]<]++<-[<+++++++++>[<->-]>>]>>]]<<
|
||||
]<]<[[<]>[[>]>>[>>]+[<<]<[<]<+>>-]>[>]+[->>]<<<<[[<<]<[<]+<<[+>+<<-[>-->+<<-[>
|
||||
+<[>>+<<-]]]>[<+>-]<]++>>-->[>]>>[>>]]<<[>>+<[[<]<]>[[<<]<[<]+[-<+>>-[<<+>++>-
|
||||
[<->[<<+>>-]]]<[>+<-]>]>[>]>]>[>>]>>]<<[>>+>>+>>]<<[->>>>>>>>]<<[>.>>>>>>>]<<[
|
||||
>->>>>>]<<[>,>>>]<<[>+>]<<[+<<]<]
|
||||
|
|
@ -0,0 +1,6 @@
|
|||
>++++++++++>+>+[
|
||||
[+++++[>++++++++<-]>.<++++++[>--------<-]+<<<]>.>>[
|
||||
[-]<[>+<-]>>[<<+>+>-]<[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-
|
||||
[>+<-[>+<-[>+<-[>[-]>+>+<<<-[>+<-]]]]]]]]]]]+>>>
|
||||
]<<<
|
||||
]
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
>>>->+>+++++>(++++++++++)[[>>>+<<<-]>+++++>+>>+[<<+>>>>>+<<<-]<-]>>>>[
|
||||
[>>>+>+<<<<-]+++>>+[<+>>>+>+<<<-]>>[>[[>>>+<<<-]<]<<++>+>>>>>>-]<-
|
||||
]+++>+>[[-]<+<[>+++++++++++++++++<-]<+]>>[
|
||||
[+++++++++.-------->>>]+[-<<<]>>>[>>,----------[>]<]<<[
|
||||
<<<[
|
||||
>--[<->>+>-<<-]<[[>>>]+>-[+>>+>-]+[<<<]<-]>++>[<+>-]
|
||||
>[[>>>]+[<<<]>>>-]+[->>>]<-[++>]>[------<]>+++[<<<]>
|
||||
]<
|
||||
]>[
|
||||
-[+>>+>-]+>>+>>>+>[<<<]>->+>[
|
||||
>[->+>+++>>++[>>>]+++<<<++<<<++[>>>]>>>]<<<[>[>>>]+>>>]
|
||||
<<<<<<<[<<++<+[-<<<+]->++>>>++>>>++<<<<]<<<+[-<<<+]+>->>->>
|
||||
]<<+<<+<<<+<<-[+<+<<-]+<+[
|
||||
->+>[-<-<<[<<<]>[>>[>>>]<<+<[<<<]>-]]
|
||||
<[<[<[<<<]>+>>[>>>]<<-]<[<<<]]>>>->>>[>>>]+>
|
||||
]>+[-<<[-]<]-[
|
||||
[>>>]<[<<[<<<]>>>>>+>[>>>]<-]>>>[>[>>>]<<<<+>[<<<]>>-]>
|
||||
]<<<<<<[---<-----[-[-[<->>+++<+++++++[-]]]]<+<+]>
|
||||
]>>
|
||||
]
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
-[
|
||||
->+++++++++>+++>->>>>->>->>>>->>->>>>->+++
|
||||
>>->+>++>>+>->++>>+>->++>>+>->++>+++++++++
|
||||
>+>[>>>]<[>------->-------->->-->>]>>-[<-]<
|
||||
++[[[>>]+++<[>]++[<]<-]>-<<++]>+>[+>]<<[++++[>++++<-]<<]
|
||||
<<<[[>->>>++++++++++<<<<+]<[>->>>>+<<<<<+]<]>>[>]>[<+>>+>>+<<<-]
|
||||
>>>[-[>>+<<-]>>]<[<+>-]<[>++<-]<[<<]<<[>->>[>]+[<]<<-]->>>[>]<+[<-<]>+
|
||||
>[.>+++++++++[-[>>+<<-]>.>]++++++++++.[-]>]+[<<]<[
|
||||
,->>>---[<<<--->>>-],<-<<[
|
||||
<++>>>++<<---[
|
||||
<++[>-----<-]>>+>-<<[
|
||||
>--<----[>+<[-]]]]]>[<+>>++++++++++<-]
|
||||
>[-[>>+<<-]>>]++++[>--------<-]>[-[[<<]<[-]<[-]>>>>[-]]]+[>>]+[[-]<<]<<<<[
|
||||
[>>[<<->>-]>>+<<<<[+<<]>>>>]>>[<<]<<<<[+>>]>>>>[<<]>>[<<<<<<->>->>>>-]<<<
|
||||
]-[+<-]-<
|
||||
]>
|
||||
]>>-----[>+++<-]>-.----------.++++++.>---.[<<+>-->----]<-.+++++.----.<++.
|
||||
|
|
@ -0,0 +1 @@
|
|||
++++++++++[>+>+++>+++++++>++++++++++<<<<-]>>>++.>+.+++++++..+++.<<++.>+++++++++++++++.>.+++.------.--------.<<.+.>>>++++++++++.
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
SOURCES += \
|
||||
main.c
|
||||
|
||||
INCLUDES +=
|
||||
|
||||
OBJECTS := $(SOURCES:%=$(BUILD_DIR)/$(notdir $(SOURCE_DIR))/%.o)
|
||||
|
||||
ifeq ($(TOTAL_BUILD_FILES),)
|
||||
TOTAL_BUILD_FILES := $(shell echo $$(($$($(MAKE) -n $(OBJECTS) TOTAL_BUILD_FILES=1 2>/dev/null | grep -c Building) + 1)))
|
||||
endif
|
||||
|
||||
$(OUTPUT): $(OBJECTS)
|
||||
@echo "[100%] $(YELLOW)Linking $(notdir $(OUTPUT))$(RESET)"
|
||||
$(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(OBJECTS) -o $@
|
||||
|
||||
$(BUILD_DIR)/$(notdir $(SOURCE_DIR))/%.o: $(SOURCE_DIR)/%
|
||||
$(Q)mkdir -p $(dir $@)
|
||||
$(eval CURRENT_FILE := $(shell echo $$(($(CURRENT_FILE) + 1))))
|
||||
$(eval PERCENTAGE := $(shell echo $$(($(CURRENT_FILE) * 100 / $(TOTAL_BUILD_FILES)))))
|
||||
@echo "[$(PERCENTAGE)%] $(GREEN)Building C object $@$(RESET)"
|
||||
$(Q)$(CC) $(CFLAGS) $(INCLUDES:%=-I%) -MMD -MP -c $< -o $@
|
||||
|
||||
-include $(OBJECTS:.o=.d)
|
||||
|
|
@ -0,0 +1,285 @@
|
|||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <errno.h>
|
||||
|
||||
#include <time.h>
|
||||
|
||||
#define BRACKETS_NB_MAX 1024
|
||||
#define DATA_SIZE_MAX 65536
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
clock_t start_time = clock();
|
||||
|
||||
int status = EXIT_FAILURE;
|
||||
|
||||
if(argc != 2)
|
||||
{
|
||||
puts("usage : brainfuck program");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
FILE *program_file = NULL;
|
||||
FILE *stripped_file = NULL;
|
||||
|
||||
program_file = fopen(argv[1], "r");
|
||||
if(program_file == NULL)
|
||||
{
|
||||
fprintf(stderr, "Error opening program file: %d\n", errno);
|
||||
goto end;
|
||||
}
|
||||
|
||||
stripped_file = tmpfile();
|
||||
if(stripped_file == NULL)
|
||||
{
|
||||
fprintf(stderr, "Error creating tmp file: %d\n", errno);
|
||||
goto end;
|
||||
}
|
||||
|
||||
// Strip program file
|
||||
while(true)
|
||||
{
|
||||
int c = fgetc(program_file);
|
||||
|
||||
if(c == EOF)
|
||||
{
|
||||
int err = ferror(program_file);
|
||||
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "Error reading file: %d\n", ferror(program_file));
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
switch(c)
|
||||
{
|
||||
case '>':
|
||||
case '<':
|
||||
case '+':
|
||||
case '-':
|
||||
case '[':
|
||||
case ']':
|
||||
case '.':
|
||||
case ',':
|
||||
fputc(c, stripped_file);
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
rewind(stripped_file);
|
||||
|
||||
if(fclose(program_file) == EOF)
|
||||
{
|
||||
program_file = NULL;
|
||||
|
||||
fprintf(stderr, "Error closing program file: %d\n", errno);
|
||||
|
||||
goto end;
|
||||
}
|
||||
|
||||
program_file = NULL;
|
||||
|
||||
size_t brackets_pos[BRACKETS_NB_MAX];
|
||||
size_t brackets_correspondances[BRACKETS_NB_MAX];
|
||||
|
||||
// Parse brackets
|
||||
size_t bracket_nb = 0;
|
||||
|
||||
while(true)
|
||||
{
|
||||
int c = fgetc(stripped_file);
|
||||
|
||||
if(c == EOF)
|
||||
{
|
||||
int err = ferror(stripped_file);
|
||||
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "Error reading file: %d\n", ferror(stripped_file));
|
||||
goto end;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
if(c == '[' || c == ']')
|
||||
{
|
||||
brackets_pos[bracket_nb] = ftell(stripped_file);
|
||||
|
||||
if(c == '[')
|
||||
{
|
||||
// Find corresponding closing bracket index
|
||||
size_t corresponding_bracket_nb = bracket_nb;
|
||||
|
||||
for(size_t bracket_index = 1; bracket_index;)
|
||||
{
|
||||
int d = fgetc(stripped_file);
|
||||
|
||||
if(d == EOF)
|
||||
{
|
||||
int err = ferror(stripped_file);
|
||||
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "Error reading file: %d\n", argv[1], ferror(stripped_file));
|
||||
}
|
||||
else
|
||||
{
|
||||
fprintf(stderr, "Reached EOF before finding closing bracket.");
|
||||
}
|
||||
|
||||
goto end;
|
||||
}
|
||||
|
||||
if(d == '[' || d == ']')
|
||||
{
|
||||
corresponding_bracket_nb++;
|
||||
}
|
||||
|
||||
if(d == '[')
|
||||
{
|
||||
bracket_index++;
|
||||
}
|
||||
else if(d == ']')
|
||||
{
|
||||
bracket_index--;
|
||||
}
|
||||
}
|
||||
|
||||
brackets_correspondances[bracket_nb] = corresponding_bracket_nb;
|
||||
brackets_correspondances[corresponding_bracket_nb] = bracket_nb;
|
||||
|
||||
fseek(stripped_file, brackets_pos[bracket_nb], SEEK_SET);
|
||||
}
|
||||
|
||||
bracket_nb++;
|
||||
}
|
||||
}
|
||||
|
||||
rewind(stripped_file);
|
||||
|
||||
// Program memory
|
||||
uint8_t mem[DATA_SIZE_MAX] = {0};
|
||||
size_t mem_pointer = 0;
|
||||
|
||||
size_t bracket_index = 0;
|
||||
|
||||
while(true)
|
||||
{
|
||||
int c = fgetc(stripped_file);
|
||||
|
||||
if(c == EOF)
|
||||
{
|
||||
int err = ferror(stripped_file);
|
||||
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "Error reading file: %d\n", ferror(stripped_file));
|
||||
goto end;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
if(c == '[' || c == ']')
|
||||
{
|
||||
if(c == '[' ? !mem[mem_pointer] : mem[mem_pointer])
|
||||
{
|
||||
bracket_index = brackets_correspondances[bracket_index];
|
||||
fseek(stripped_file, brackets_pos[bracket_index], SEEK_SET);
|
||||
}
|
||||
}
|
||||
else if(c == '>')
|
||||
{
|
||||
mem_pointer++;
|
||||
}
|
||||
else if(c == '<')
|
||||
{
|
||||
mem_pointer--;
|
||||
}
|
||||
else if(c == '+')
|
||||
{
|
||||
mem[mem_pointer]++;
|
||||
}
|
||||
else if(c == '-')
|
||||
{
|
||||
mem[mem_pointer]--;
|
||||
}
|
||||
else if(c == '.')
|
||||
{
|
||||
putchar(mem[mem_pointer]);
|
||||
fflush(stdout);
|
||||
}
|
||||
else if(c == ',')
|
||||
{
|
||||
/*
|
||||
static int next_input = -1;
|
||||
int input;
|
||||
|
||||
if(next_input != -1)
|
||||
{
|
||||
input = next_input;
|
||||
next_input = -1;
|
||||
}
|
||||
else
|
||||
{
|
||||
input = getchar();
|
||||
}
|
||||
|
||||
next_input = getchar();
|
||||
|
||||
if(input != '\n')
|
||||
{
|
||||
mem[mem_pointer] = input;
|
||||
}
|
||||
else
|
||||
{
|
||||
if(next_input == '\n')
|
||||
{
|
||||
mem[mem_pointer] = '\n';
|
||||
}
|
||||
|
||||
next_input = -1;
|
||||
}
|
||||
*/
|
||||
mem[mem_pointer] = getchar();
|
||||
}
|
||||
|
||||
if(c == '[' || c == ']')
|
||||
{
|
||||
bracket_index++;
|
||||
}
|
||||
}
|
||||
|
||||
status = EXIT_SUCCESS;
|
||||
|
||||
end:
|
||||
if(stripped_file != NULL)
|
||||
{
|
||||
if(fclose(stripped_file))
|
||||
{
|
||||
fprintf(stderr, "Failed to close tmp file: %d\n", errno);
|
||||
}
|
||||
}
|
||||
|
||||
if(program_file != NULL)
|
||||
{
|
||||
if(fclose(program_file))
|
||||
{
|
||||
fprintf(stderr, "Failed to close tmp file: %d\n", errno);
|
||||
}
|
||||
}
|
||||
|
||||
clock_t end_time = clock();
|
||||
|
||||
fprintf(stderr, "\nExecution time : %fs\n", (float)(end_time - start_time) / (float)CLOCKS_PER_SEC);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
Universal Turing Machine
|
||||
|
||||
If you just want a quick and complete test case the input b1b1bbb1c1c11111d
|
||||
should produce the output 1c11111
|
||||
|
||||
+++>++>>>+[>>,[>+++++<[[->]<<]<[>]>]>-[<<+++++>>-[<<---->>-[->]<]]
|
||||
<[<-<[<]+<+[>]<<+>->>>]<]<[<]>[-[>++++++<-]>[<+>-]+<<<+++>+>
|
||||
[-
|
||||
[<<+>->-
|
||||
[<<[-]>>-
|
||||
[<<++>+>-
|
||||
[<<-->->>+++<-
|
||||
[<<+>+>>--<-
|
||||
[<<->->-
|
||||
[<<++++>+>>+<-
|
||||
[>-<-
|
||||
[<<->->-
|
||||
[<<->>-
|
||||
[<<+++>>>-<-
|
||||
[<<---->>>++<-
|
||||
[<<++>>>+<-
|
||||
[>[-]<-
|
||||
[<<->>>+++<-
|
||||
[<<->>>--<-
|
||||
[<<++++>+>>+<-
|
||||
[<<[-]>->>++<-
|
||||
[<<+++++>+>>--<-
|
||||
[<->>++<
|
||||
[<<->>-
|
||||
]]]]]]]]]]]]]]]]]]]]]]<[->>[<<+>>-]<<<[>>>+<<<-]<[>>>+<<<-]]>>]
|
||||
>[-[---[-<]]>]>[+++[<+++++>--]>]+<++[[>+++++<-]<]>>[-.>]
|
||||
Loading…
Reference in New Issue