diff options
Diffstat (limited to 'assembler.c')
| -rw-r--r-- | assembler.c | 191 |
1 files changed, 84 insertions, 107 deletions
diff --git a/assembler.c b/assembler.c index faf7bb3..87a672b 100644 --- a/assembler.c +++ b/assembler.c @@ -14,44 +14,6 @@ struct Label u64 cur, next; }; -/* First, the functions to call external utilities (badly written, I know). They - * presume a filled asm_buffer. */ - -void asm_write(const char *asm_name, vec_t *asm_buffer) -{ - FILE *fp = fopen(asm_name, "w"); - fwrite(asm_buffer->data, asm_buffer->size, 1, fp); - fclose(fp); -} - -int asm_assemble(const char *asm_name, const char *objname) -{ -#ifdef DEBUG - char *format_str = "yasm -f elf64 -g dwarf2 -o %s %s"; -#else - char *format_str = "yasm -f elf64 -o %s %s"; -#endif - char command[snprintf(NULL, 0, format_str, objname, asm_name) + 1]; - sprintf(command, format_str, objname, asm_name); - return system(command); -} - -int asm_link(const char *objname, const char *outname) -{ - char *format_str = "ld -o %s %s"; - char command[snprintf(NULL, 0, format_str, outname, objname) + 1]; - sprintf(command, format_str, outname, objname); - return system(command); -} - -int asm_compile(vec_t *asm_buffer, const char *asm_name, const char *objname, - const char *outname) -{ - asm_write(asm_name, asm_buffer); - asm_assemble(asm_name, objname); - return asm_link(objname, outname); -} - // A table which translates brainfuck operations into generic assembly code (I // love C's array indexing) static const struct @@ -85,16 +47,18 @@ i64 get_abs_label(u64, struct Label *, u64); // and next items in given pointers. void ast_ref_to_asm_label(u64, struct Label *, u64, i64 *, i64 *); -// Write the initial boilerplate of the assembly file -void asm_write_init(vec_t *asm_buffer); - -// Write the exit code boilerplate for the assembly file -void asm_write_exit(vec_t *asm_buffer); - void asm_translate_nodes(vec_t *asm_buffer, struct PResult nodes, const char *src_name) { - asm_write_init(asm_buffer); + vec_append_fmt(asm_buffer, + "section .bss\n" + " memory resb %d\n" + "section .text\n" + "global _start\n" + "_start:\n" + " mov r9, memory\n", + MEMORY_DEFAULT); + // First pass: Setup the ASM label array struct Label labels[nodes.labels ? nodes.labels * 2 : 1]; if (nodes.labels) @@ -110,55 +74,56 @@ void asm_translate_nodes(vec_t *asm_buffer, struct PResult nodes, for (size_t i = 0; i < nodes.size; ++i) { node_t node = nodes.nodes[i]; - if (node.type == LIN || node.type == LOUT) + // Something we can compile with only the information at hand + if (!(node.type == LIN || node.type == LOUT)) { - // Translate the node-relative addresses to assembly-label-relative - // addresses - i64 cur_asm_label = 0, next_asm_label = 0; - ast_ref_to_asm_label(i, labels, nodes.labels * 2, &cur_asm_label, - &next_asm_label); - if (cur_asm_label == -1 || next_asm_label == -1) - { - print_error( - src_name, node.row, node.col, - "[ASSEMBLY ERROR]: Could not find label for current jump!\n"); - exit(1); - } - - // Format labels - char current_label[128], next_label[128]; - - sprintf(current_label, ".L%lu", cur_asm_label); - sprintf(next_label, ".L%lu", next_asm_label); - - // Setup format string for assembly jump code - char *format_string = NULL; - if (node.type == LIN) - { - format_string = "%s:\n" - " cmp byte [r9], 0\n" - " je %s\n"; - } - else - { - format_string = "%s:\n" - " cmp byte [r9], 0\n" - " jne %s\n"; - } - char formatted_string[snprintf(NULL, 0, format_string, current_label, - next_label) + - 1]; - snprintf(formatted_string, sizeof(formatted_string), format_string, - current_label, next_label); - vec_append(asm_buffer, formatted_string, sizeof(formatted_string) - 1); + // I love tables so goddamn much + vec_append(asm_buffer, table[node.type].str, table[node.type].len); + continue; + } + + // NOTE: Must be a label + + // Translate the node-relative addresses to assembly-label-relative + // addresses + i64 cur_asm_label = 0, next_asm_label = 0; + ast_ref_to_asm_label(i, labels, nodes.labels * 2, &cur_asm_label, + &next_asm_label); + if (cur_asm_label == -1 || next_asm_label == -1) + { + print_error(src_name, node.row, node.col, + "[ASSEMBLY ERROR]: Could not find label for current jump!\n"); + exit(1); + } + + // Format labels + char current_label[128], next_label[128]; + + sprintf(current_label, ".L%lu", cur_asm_label); + sprintf(next_label, ".L%lu", next_asm_label); + + // Setup format string for assembly jump code + char *format_string = NULL; + if (node.type == LIN) + { + format_string = "%s:\n" + " cmp byte [r9], 0\n" + " je %s\n"; } else { - // I love tables so goddamn much - vec_append(asm_buffer, table[node.type].str, table[node.type].len); + format_string = "%s:\n" + " cmp byte [r9], 0\n" + " jne %s\n"; } + vec_append_fmt(asm_buffer, format_string, current_label, next_label); } - asm_write_exit(asm_buffer); + + vec_append(asm_buffer, + " mov rax, 60\n" + " mov rdi, 0\n" + " syscall\n", + 37); } /* Implementations for throwaway functions */ @@ -180,27 +145,39 @@ void ast_ref_to_asm_label(u64 ref, struct Label *labels, u64 size, i64 *cur, *next = get_abs_label(labels[*cur].next, labels, size); } -// Write the initial boilerplate of the assembly file -void asm_write_init(vec_t *asm_buffer) +/* The system calling code - not exactly pretty, but it is what it is. */ + +void asm_write(const char *asm_name, vec_t *asm_buffer) { - const char format_string[] = "section .bss\n" - " memory resb %d\n" - "section .text\n" - "global _start\n" - "_start:\n" - " mov r9, memory\n"; - char initial_assembly[snprintf(NULL, 0, format_string, MEMORY_DEFAULT) + 1]; - snprintf(initial_assembly, sizeof(initial_assembly), format_string, - MEMORY_DEFAULT); - vec_append(asm_buffer, initial_assembly, sizeof(initial_assembly) - 1); + FILE *fp = fopen(asm_name, "w"); + fwrite(asm_buffer->data, asm_buffer->size, 1, fp); + fclose(fp); } -// Write the exit code for the assembly file -void asm_write_exit(vec_t *asm_buffer) +int asm_assemble(const char *asm_name, const char *objname) { - vec_append(asm_buffer, - " mov rax, 60\n" - " mov rdi, 0\n" - " syscall\n", - 37); +#ifdef DEBUG + char *format_str = "yasm -f elf64 -g dwarf2 -o %s %s"; +#else + char *format_str = "yasm -f elf64 -o %s %s"; +#endif + char command[SIZE_FMT(format_str, objname, asm_name) + 1]; + sprintf(command, format_str, objname, asm_name); + return system(command); +} + +int asm_link(const char *objname, const char *outname) +{ + char *format_str = "ld -o %s %s"; + char command[SIZE_FMT(format_str, outname, objname) + 1]; + sprintf(command, format_str, outname, objname); + return system(command); +} + +int asm_compile(vec_t *asm_buffer, const char *asm_name, const char *objname, + const char *outname) +{ + asm_write(asm_name, asm_buffer); + asm_assemble(asm_name, objname); + return asm_link(objname, outname); } |