1065 lines
17 KiB
ArmAsm
1065 lines
17 KiB
ArmAsm
# This Source Code Form is subject to the terms of the Mozilla Public License,
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# v. 2.0. If a copy of the MPL was not distributed with this file, You can
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# obtain one at https://mozilla.org/MPL/2.0/.
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.equ SOURCE_BUFFER_SIZE, 81920
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.equ SYS_READ, 63
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.equ SYS_WRITE, 64
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.equ SYS_EXIT, 93
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.equ SYS_MMAP2, 222
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.equ STDIN, 0
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.equ STDOUT, 1
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.equ STDERR, 2
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.section .rodata
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.type keyword_equ, @object
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keyword_equ: .ascii ".equ"
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.equ KEYWORD_EQU_SIZE, 4
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.type keyword_section, @object
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keyword_section: .ascii ".section"
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.equ KEYWORD_SECTION_SIZE, 8
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.type keyword_type, @object
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keyword_type: .ascii ".type"
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.equ KEYWORD_TYPE_SIZE, 5
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.type keyword_type_object, @object
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keyword_type_object: .ascii "object"
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.equ KEYWORD_TYPE_OBJECT_SIZE, 6
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.type keyword_type_function, @object
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keyword_type_function: .ascii "function"
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.equ KEYWORD_TYPE_FUNCTION_SIZE, 8
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.type keyword_ret, @object
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keyword_ret: .ascii "ret"
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.equ KEYWORD_RET_SIZE, 3
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.type keyword_global, @object
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keyword_global: .ascii ".globl"
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.equ KEYWORD_GLOBAL_SIZE, 6
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.type keyword_proc, @object
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keyword_proc: .ascii "proc "
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.equ KEYWORD_PROC_SIZE, 5
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.type keyword_end, @object
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keyword_end: .ascii "end"
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.equ KEYWORD_END_SIZE, 3
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.type keyword_begin, @object
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keyword_begin: .ascii "begin"
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.equ KEYWORD_BEGIN_SIZE, 5
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.type keyword_var, @object
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keyword_var: .ascii "var"
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.equ KEYWORD_VAR_SIZE, 3
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.type asm_prologue, @object
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asm_prologue: .string "\taddi sp, sp, -32\n\tsw ra, 28(sp)\n\tsw s0, 24(sp)\n\taddi s0, sp, 32\n"
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.type asm_epilogue, @object
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asm_epilogue: .string "\tlw ra, 28(sp)\n\tlw s0, 24(sp)\n\taddi sp, sp, 32\n\tret\n"
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.type asm_type_directive, @object
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asm_type_directive: .string ".type "
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.type asm_type_function, @object
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asm_type_function: .string ", @function\n"
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.type asm_colon, @object
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asm_colon: .string ":\n"
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.type asm_call, @object
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asm_call: .string "\tcall "
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.section .bss
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.type source_code, @object
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source_code: .zero SOURCE_BUFFER_SIZE
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.type source_code_position, @object
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source_code_position: .word 0
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.section .text
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# Reads standard input into a buffer.
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# a0 - Buffer pointer.
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# a1 - Buffer size.
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#
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# Returns the amount of bytes written in a0.
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.type _read_file, @function
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_read_file:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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mv a2, a1
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mv a1, a0
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li a0, STDIN
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li a7, SYS_READ
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ecall
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Writes a character from a0 into the standard output.
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.type _write_c, @function
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_write_c:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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sb a0, 20(sp)
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li a0, STDOUT
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addi a1, sp, 20
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li a2, 1
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li a7, SYS_WRITE
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ecall
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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add sp, sp, 32
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ret
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# Write null terminated string.
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#
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# Parameters:
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# a0 - String.
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.type _write_z, @function
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_write_z:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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sw a0, 20(sp)
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.write_z_loop:
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# Check for 0 character.
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lb a0, (a0)
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beqz a0, .write_z_end
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# Print a character.
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li a0, STDOUT
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lw a1, 20(sp)
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li a2, 1
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li a7, SYS_WRITE
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ecall
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# Advance the input string by one byte.
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lw a0, 20(sp)
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addi a0, a0, 1
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sw a0, 20(sp)
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j .write_z_loop
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.write_z_end:
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Detects if a0 is an uppercase character. Sets a0 to 1 if so, otherwise to 0.
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.type _is_upper, @function
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_is_upper:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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li t0, 'A' - 1
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sltu t1, t0, a0 # t1 = a0 >= 'A'
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sltiu t2, a0, 'Z' + 1 # t2 = a0 <= 'Z'
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and a0, t1, t2 # t1 = a0 >= 'A' & a0 <= 'Z'
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Detects if a0 is an lowercase character. Sets a0 to 1 if so, otherwise to 0.
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.type _is_lower, @function
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_is_lower:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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li t0, 'a' - 1
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sltu t2, t0, a0 # t2 = a0 >= 'a'
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sltiu t3, a0, 'z' + 1 # t3 = a0 <= 'z'
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and a0, t2, t3 # t2 = a0 >= 'a' & a0 <= 'z'
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Detects if the passed character is a 7-bit alpha character or an underscore.
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#
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# Paramters:
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# a0 - Tested character.
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#
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# Sets a0 to 1 if the character is an alpha character or underscore, sets it to 0 otherwise.
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.type _is_alpha, @function
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_is_alpha:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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sw a0, 20(sp)
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call _is_upper
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sw a0, 16(sp)
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lw a0, 20(sp)
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call _is_lower
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lw t0, 20(sp)
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xori t1, t0, '_'
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seqz t1, t1
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lw t0, 16(sp)
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or a0, a0, t0
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or a0, a0, t1
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Detects whether the passed character is a digit
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# (a value between 0 and 9).
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#
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# Parameters:
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# a0 - Exemined value.
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#
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# Sets a0 to 1 if it is a digit, to 0 otherwise.
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.type _is_digit, @function
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_is_digit:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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li t0, '0' - 1
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sltu t1, t0, a0 # t1 = a0 >= '0'
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sltiu t2, a0, '9' + 1 # t2 = a0 <= '9'
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and a0, t1, t2
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Reads the next token.
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#
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# Returns token length in a0.
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.type _read_token, @function
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_read_token:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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la t0, source_code_position # Token pointer.
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lw t0, (t0)
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sw t0, 20(sp) # Current token position.
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sw zero, 16(sp) # Token length.
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.read_token_loop:
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lb t0, (t0) # Current character.
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# First we try to read a derictive.
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# A derictive can contain a dot and characters.
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li t1, '.'
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beq t0, t1, .read_token_next
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lw a0, 20(sp)
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lb a0, (a0)
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call _is_alpha
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bnez a0, .read_token_next
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lw a0, 20(sp)
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lb a0, (a0)
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call _is_digit
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bnez a0, .read_token_next
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j .read_token_end
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.read_token_next:
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# Advance the source code position and token length.
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lw t0, 16(sp)
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addi t0, t0, 1
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sw t0, 16(sp)
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lw t0, 20(sp)
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addi t0, t0, 1
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sw t0, 20(sp)
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j .read_token_loop
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.read_token_end:
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lw a0, 16(sp)
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# a0 - First pointer.
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# a1 - Second pointer.
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# a2 - The length to compare.
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#
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# Returns 0 in a0 if memory regions are equal.
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.type _memcmp, @function
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_memcmp:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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mv t0, a0
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li a0, 0
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.Lmemcmp_loop:
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beqz a2, .Lmemcmp_end
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lbu t1, (t0)
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lbu t2, (a1)
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sub a0, t1, t2
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bnez a0, .Lmemcmp_end
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addi t0, t0, 1
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addi a1, a1, 1
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addi a2, a2, -1
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j .Lmemcmp_loop
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.Lmemcmp_end:
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Advances the token stream by a0 bytes.
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.type _advance_token, @function
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_advance_token:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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# Skip the .equ directive.
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la t0, source_code_position
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lw t1, (t0)
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add t1, t1, a0
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sw t1, (t0)
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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.type _compile_section, @function
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_compile_section:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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# Print the .section directive and a space after it.
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li a0, STDOUT
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la a1, source_code_position
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lw a1, (a1)
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li a2, KEYWORD_SECTION_SIZE + 1
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li a7, SYS_WRITE
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ecall
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# Skip the .equ directive.
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li a0, KEYWORD_SECTION_SIZE + 1
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call _advance_token
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# Read the section name.
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call _read_token
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sw a0, 16(sp)
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# Print the section name and newline.
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li a0, STDOUT
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la a1, source_code_position
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lw a1, (a1)
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lw a2, 16(sp)
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addi a2, a2, 1
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li a7, SYS_WRITE
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ecall
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# Skip the section name.
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lw a0, 16(sp)
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addi a0, a0, 1
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call _advance_token
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Prints and skips a line.
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.type _skip_comment, @function
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_skip_comment:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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la t0, source_code_position
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lw t1, (t0)
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.skip_comment_loop:
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# Check for newline character.
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lb t2, (t1)
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li t3, '\n'
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beq t2, t3, .skip_comment_end
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# Advance the input string by one byte.
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addi t1, t1, 1
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sw t1, (t0)
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j .skip_comment_loop
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.skip_comment_end:
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# Skip the newline.
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addi t1, t1, 1
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sw t1, (t0)
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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# Prints and skips a line.
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.type _compile_line, @function
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_compile_line:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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la a0, source_code_position
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lw a1, (a0)
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.compile_line_loop:
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# Check for newline character.
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lb t0, (a1)
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li t1, '\n'
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beq t0, t1, .compile_line_end
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# Print a character.
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li a0, STDOUT
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li a2, 1
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li a7, SYS_WRITE
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ecall
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# Advance the input string by one byte.
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la a0, source_code_position
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lw a1, (a0)
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addi a1, a1, 1
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sw a1, (a0)
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j .compile_line_loop
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.compile_line_end:
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# Print and skip the newline.
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li a0, STDOUT
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li a2, 1
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li a7, SYS_WRITE
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ecall
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la a0, source_code_position
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lw a1, (a0)
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addi a1, a1, 1
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sw a1, (a0)
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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.type _compile_object, @function
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_compile_object:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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call _compile_line
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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.type _compile_function_statements, @function
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_compile_function_statements:
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# Prologue.
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addi sp, sp, -32
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sw ra, 28(sp)
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sw s0, 24(sp)
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addi s0, sp, 32
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.compile_function_statements_loop:
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la t0, source_code_position
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lw t1, (t0)
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addi t1, t1, 1 # Skip the tab.
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mv a0, t1
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la a1, keyword_ret
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li a2, KEYWORD_RET_SIZE
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call _memcmp
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beqz a0, .compile_function_statements_end
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call _compile_line
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j .compile_function_statements_loop
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.compile_function_statements_end:
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call _compile_line
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# Epilogue.
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lw ra, 28(sp)
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lw s0, 24(sp)
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addi sp, sp, 32
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ret
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.type _compile_call, @function
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|
_compile_call:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
call _read_token
|
|
sw a0, 20(sp)
|
|
|
|
la a0, asm_call
|
|
call _write_z
|
|
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
lw a2, 20(sp)
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
# Skip parens, semicolon and newline.
|
|
lw a0, 20(sp)
|
|
addi a0, a0, 4
|
|
call _advance_token
|
|
|
|
li a0, '\n'
|
|
call _write_c
|
|
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
.type _compile_statement, @function
|
|
_compile_statement:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
# This is a call if the statement starts with an underscore.
|
|
la t0, source_code_position
|
|
lw t0, (t0)
|
|
# First character after alignment tab.
|
|
addi t0, t0, 1
|
|
lb t0, (t0)
|
|
|
|
li t1, '_'
|
|
beq t0, t1, .compile_statement_call
|
|
|
|
call _compile_line
|
|
j .compile_statement_end
|
|
|
|
.compile_statement_call:
|
|
li a0, 1
|
|
call _advance_token
|
|
call _compile_call
|
|
|
|
j .compile_statement_end
|
|
|
|
.compile_statement_end:
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
.type _compile_procedure_body, @function
|
|
_compile_procedure_body:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
.compile_procedure_body_loop:
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_end
|
|
li a2, KEYWORD_END_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_procedure_body_epilogue
|
|
|
|
call _compile_statement
|
|
j .compile_procedure_body_loop
|
|
|
|
.compile_procedure_body_epilogue:
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
.type _compile_procedure, @function
|
|
_compile_procedure:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
# Skip "proc ".
|
|
li a0, KEYWORD_PROC_SIZE
|
|
call _advance_token
|
|
|
|
call _read_token
|
|
sw a0, 20(sp) # Save the procedure name length.
|
|
|
|
# Write .type _procedure_name, @function.
|
|
la a0, asm_type_directive
|
|
call _write_z
|
|
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
lw a2, 20(sp)
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
la a0, asm_type_function
|
|
call _write_z
|
|
|
|
# Write procedure label, _procedure_name:
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
lw a2, 20(sp)
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
la a0, asm_colon
|
|
call _write_z
|
|
|
|
# Skip the function name and trailing parens, semicolon, "begin" and newline.
|
|
lw a0, 20(sp)
|
|
addi a0, a0, KEYWORD_BEGIN_SIZE + 1 + 4
|
|
call _advance_token
|
|
|
|
la a0, asm_prologue
|
|
call _write_z
|
|
|
|
call _compile_procedure_body
|
|
|
|
# Write the epilogue.
|
|
la a0, asm_epilogue
|
|
call _write_z
|
|
|
|
li a0, KEYWORD_END_SIZE + 2
|
|
call _advance_token
|
|
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
.type _compile_function, @function
|
|
_compile_function:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
# Write the function header.
|
|
call _compile_line
|
|
call _compile_function_statements
|
|
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
.type _compile_type, @function
|
|
_compile_type:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
# Print the .type directive and a space after it.
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
li a2, KEYWORD_TYPE_SIZE + 1
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
# Skip the .type directive.
|
|
li a0, KEYWORD_TYPE_SIZE + 1
|
|
call _advance_token
|
|
|
|
# Read and print the symbol name.
|
|
call _read_token
|
|
sw a0, 20(sp)
|
|
|
|
# Print the symbol name, comma, space and @.
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
lw a2, 20(sp)
|
|
addi a2, a2, 3
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
# Skip the constant name, comma, space and @.
|
|
lw a0, 20(sp)
|
|
addi a0, a0, 3
|
|
call _advance_token
|
|
|
|
# Read the symbol type.
|
|
call _read_token
|
|
sw a0, 16(sp)
|
|
la t0, source_code_position
|
|
lw t0, (t0)
|
|
sw t0, 12(sp)
|
|
|
|
# Print the symbol type and newline.
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
lw a2, 16(sp)
|
|
addi a2, a2, 1
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
lw a0, 16(sp)
|
|
addi a0, a0, 1
|
|
call _advance_token
|
|
|
|
lw a0, 12(sp)
|
|
la a1, keyword_type_object
|
|
li a2, KEYWORD_TYPE_OBJECT_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_type_object
|
|
|
|
lw a0, 12(sp)
|
|
la a1, keyword_type_function
|
|
li a2, KEYWORD_TYPE_FUNCTION_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_type_function
|
|
|
|
j .compile_type_end
|
|
|
|
.compile_type_object:
|
|
call _compile_object
|
|
|
|
j .compile_type_end
|
|
|
|
.compile_type_function:
|
|
call _compile_function
|
|
|
|
j .compile_type_end
|
|
|
|
.compile_type_end:
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
.type _compile_equ, @function
|
|
_compile_equ:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
# Print the .equ directive and a space after it.
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
li a2, KEYWORD_EQU_SIZE + 1
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
# Skip the .equ directive.
|
|
li a0, KEYWORD_EQU_SIZE + 1
|
|
call _advance_token
|
|
|
|
# Read and print the constant name.
|
|
call _read_token
|
|
sw a0, 20(sp)
|
|
|
|
# Print the constant name, comma and space.
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
lw a2, 20(sp)
|
|
addi a2, a2, 2
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
# Skip the constant name, comma and the space after it.
|
|
lw a0, 20(sp)
|
|
addi a0, a0, 2
|
|
call _advance_token
|
|
|
|
# Read the constant value.
|
|
call _read_token
|
|
sw a0, 16(sp)
|
|
|
|
# Print the constant value and newline.
|
|
li a0, STDOUT
|
|
la a1, source_code_position
|
|
lw a1, (a1)
|
|
lw a2, 16(sp)
|
|
addi a2, a2, 1
|
|
li a7, SYS_WRITE
|
|
ecall
|
|
|
|
lw a2, 16(sp)
|
|
addi a2, a2, 1
|
|
call _advance_token
|
|
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
.type _skip_newlines, @function
|
|
_skip_newlines:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
# Skip newlines.
|
|
la t0, source_code_position
|
|
lw t1, (t0)
|
|
|
|
.skip_newlines_loop:
|
|
lb t2, (t1)
|
|
li t3, '\n'
|
|
bne t2, t3, .skip_newlines_end
|
|
beqz t2, .skip_newlines_end
|
|
|
|
addi t1, t1, 1
|
|
sw t1, (t0)
|
|
|
|
j .skip_newlines_loop
|
|
|
|
.skip_newlines_end:
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
# Process the source code and print the generated code.
|
|
.type _compile, @function
|
|
_compile:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
.compile_loop:
|
|
call _skip_newlines
|
|
|
|
la t0, source_code_position
|
|
lw t0, (t0)
|
|
lb t0, (t0)
|
|
beqz t0, .compile_end
|
|
li t1, '#'
|
|
beq t0, t1, .compile_comment
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_equ
|
|
li a2, KEYWORD_EQU_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_equ
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_section
|
|
li a2, KEYWORD_SECTION_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_section
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_type
|
|
li a2, KEYWORD_TYPE_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_type
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_proc
|
|
li a2, KEYWORD_PROC_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_procedure
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_global
|
|
li a2, KEYWORD_GLOBAL_SIZE
|
|
call _memcmp
|
|
|
|
beqz a0, .compile_global
|
|
|
|
j .compile_end # Not a known token, exit.
|
|
|
|
.compile_equ:
|
|
call _compile_equ
|
|
|
|
j .compile_loop
|
|
|
|
.compile_section:
|
|
call _compile_section
|
|
|
|
j .compile_loop
|
|
|
|
.compile_type:
|
|
call _compile_type
|
|
|
|
j .compile_loop
|
|
|
|
.compile_global:
|
|
call _compile_line
|
|
|
|
j .compile_loop
|
|
|
|
.compile_comment:
|
|
call _skip_comment
|
|
|
|
j .compile_loop
|
|
|
|
.compile_procedure:
|
|
call _compile_procedure
|
|
|
|
j .compile_loop
|
|
|
|
.compile_end:
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|
|
|
|
# Entry point.
|
|
.globl _start
|
|
.type _start, @function
|
|
_start:
|
|
# Prologue.
|
|
addi sp, sp, -32
|
|
sw ra, 28(sp)
|
|
sw s0, 24(sp)
|
|
addi s0, sp, 32
|
|
|
|
# Read the source from the standard input.
|
|
la a0, source_code
|
|
li a1, SOURCE_BUFFER_SIZE # Buffer size.
|
|
call _read_file
|
|
|
|
# Save the pointer to the beginning of the source code in a global variable.
|
|
la t0, source_code
|
|
la t1, source_code_position
|
|
sw t0, (t1)
|
|
|
|
call _compile
|
|
|
|
# Call exit.
|
|
li a0, 0 # Use 0 return code.
|
|
li a7, SYS_EXIT
|
|
ecall
|
|
|
|
# Epilogue.
|
|
lw ra, 28(sp)
|
|
lw s0, 24(sp)
|
|
addi sp, sp, 32
|
|
ret
|