diff options
Diffstat (limited to '04b')
| -rw-r--r-- | 04b/in03 | 213 |
1 files changed, 192 insertions, 21 deletions
@@ -34,6 +34,7 @@ A=d3 J=A ?J<0:output_file_error +:second_pass_starting_point ; write ELF header J=d4 I=:ELF_header @@ -150,6 +151,24 @@ D=A !:read_line :eof + C=:second_pass + D=1C + ?D!0:exit_success + ; set 2nd pass to 1 + 1C=d1 + ; seek both files back to start + J=d3 + I=d0 + D=d0 + syscall x8 + J=d4 + I=d0 + D=d0 + syscall x8 + + !:second_pass_starting_point + +:exit_success J=d0 syscall x3c @@ -177,7 +196,7 @@ align C=:local_start 8C=I J=:local_variables - D=d9 + D=d5 call :ident_lookup C=A ?C!0:local_redeclaration @@ -192,9 +211,9 @@ align J+=d1 ; store address D=:stack_end - D=8D - 8J=D - J+=d8 + D=4D + 4J=D + J+=d4 ; store null terminator 1J=0 ; update :stack_end @@ -222,6 +241,11 @@ align reserve d8 :handle_global + ; ignore if this is the second pass + C=:second_pass + C=1C + ?C!0:read_line + ; skip ' ' I+=d1 call :read_type @@ -234,7 +258,7 @@ align C=:global_start 8C=I J=:global_variables - D=d9 + D=d5 call :ident_lookup C=A ?C!0:global_redeclaration @@ -250,9 +274,9 @@ align J+=d1 ; store address D=:static_memory_end - D=8D - 8J=D - J+=d8 + D=4D + 4J=D + J+=d4 ; store null terminator 1J=0 ; update :static_memory_end @@ -267,10 +291,10 @@ align !:read_line :handle_function - ; emit "mov rbp, rsp" + ; emit prologue J=d4 - I=:mov_rbp_rsp - D=d3 + I=:function_prologue + D=d14 syscall x1 ; reset local variable table @@ -282,10 +306,50 @@ align ; go read the next line !:read_line -:mov_rbp_rsp +:function_prologue + ; sub rsp, 8 + x48 + x81 + xec + x08 + x00 + x00 + x00 + ; mov [rsp], rbp + x48 + x89 + x2c + x24 + ; mov rbp, rsp R=S + ; total length: 7 + 4 + 3 = 14 bytes + +:function_epilogue + ; mov rsp, rbp + S=R + ; mov rbp, [rsp] + x48 + x8b + x2c + x24 + ; add rsp, 8 + x48 + x81 + xc4 + x08 + x00 + x00 + x00 + ; ret + return + ; total length = 15 bytes :handle_label_definition + ; ignore if this is the second pass + C=:second_pass + C=1C + ?C!0:read_line + ; make sure label only has identifier characters I=:line I+=d1 @@ -338,16 +402,9 @@ align ; @TODO: handle argument - ; emit "mov rsp, rbp" - J=d4 - I=:mov_rsp_rbp - D=d3 - syscall x1 - - ; emit "ret" J=d4 - I=:ret - D=d1 + I=:function_epilogue + D=d15 syscall x1 ; go read the next lines @@ -391,6 +448,11 @@ align ; look up identifier rsi in list rdi with separation rdx between entries ; returns address of whatever's right after the identifier in the list, or 0 if not found :ident_lookup + C=:second_pass + C=1C + ; use default of 0 on first pass + ?C!0:return_0 + C=:ident_lookup_sep 8C=D C=:ident_lookup_i @@ -432,6 +494,104 @@ align ?B=A:return_1 !:return_0 +; set rax to the term in rsi +:set_rax_to_term + R=I + + C=1I + D='' + ?C=D:term_char + + C=1I + D=d58 + ?C<D:term_number + + ; variable + J=:local_variables + D=d5 + call :ident_lookup + C=A + ?C=0:rax2term_try_global + ; it's a local variable + ; skip over its type + C+=d1 + ; read the offset from rbp + D=4C + ; put negated offset in rcx + C=d0 + C-=D + ; store negated offset in :rax2term_addr + D=:rax2term_addr + 4D=C + + J=d4 + I=:load_rbp_offset_prefix + D=d3 + syscall x1 + J=d4 + I=:rax2term_addr + D=d4 + syscall x1 + + + :rax2term_try_global + J=:global_variables + D=d5 + call :ident_lookup + C=A + ?C=0:bad_term + ; it's a global variable + ; skip over its type + C+=d1 + C=4C + D=:rax2term_addr + 4D=C + + ; put address in rbx + J=d4 + I=:mov_ebx_imm32_prefix + D=d1 + syscall x1 + J=d4 + I=:rax2term_addr + D=d4 + syscall x1 + + ; now load [rbx] into rax + J=d4 + I=:mov_rax_[rbx] + D=d3 + syscall x1 + + return + +:term_char + ; @TODO + xcc + +:term_number + ; @TODO + xcc + +align +:rax2term_addr + reserve d4 + +:mov_ebx_imm32_prefix + xbb + +:mov_rax_[rbx] + x48 + x8b + x03 + +; prefix for mov rax, [rbp+IMM32] +:load_rbp_offset_prefix + x48 + x8b + x85 + + ; read the space-terminated type from rsi, advance rsi, and set rax to the corresponding type number: ; 0 for non-pointer types ; 1 for pointer to char @@ -532,6 +692,15 @@ align xa x0 +:bad_term + B=:bad_term_error_message + !:program_error + +:bad_term_error_message + str Bad term. + xa + x0 + :label_redefinition B=:label_redefinition_error_message !:program_error @@ -796,6 +965,8 @@ align reserve d20000 :labels reserve d200000 +:second_pass + reserve d1 :ELF_header x7f |