oyvindskaaden
/
TDT4205
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Finished two of the generator parts 

- string table
-global vars

beginnings of function
main
Øyvind Skaaden 2022-03-31 23:12:12 +02:00
parent 7b0cf372c8
commit 36680f5c8d
1 changed files with 52 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
exercises/05/vslc/src/generator.c
View File

@ -1,5 +1,8 @@
#include <vslc.h>
#define ASM(opcode, args...) puts("\t"#opcode"\t"#args)
#define LABEL(label) printf("_%s:\n", (char*)label)
/**Generate table of strings in a rodata section. */
void generate_stringtable ( void );
/**Declare global variables in a bss section */
@ -20,6 +23,8 @@ static const char *record[6] = {
"%rdi", "%rsi", "%rdx", "%rcx", "%r8", "%r9"
};
static uint64_t fetch_symbols(tlhash_t* symbol_table, symbol_t*** symbol_list);
void
generate_program ( void )
{
@ -30,12 +35,21 @@ generate_program ( void )
*/
// TODO: Implement
// - Generate string table
// - Declare global variables
// - Generate code for all functions
// - Generate main (function already implemented) by assigning either the
// function named main or the first function of the source file if no
// main exists.
generate_stringtable();
generate_global_variables();
symbol_t **global_list;
uint64_t no_globals = fetch_symbols(global_names, &global_list);
for (uint64_t g = 0; g < no_globals; g++)
{
if (global_list[g]->type == SYM_FUNCTION)
generate_function(global_list[g]);
}
}
void
@ -44,24 +58,48 @@ generate_stringtable ( void )
/* These can be used to emit numbers, strings and a run-time
* error msg. from main
*/
puts("# DATA SECTION");
puts(".data");
puts(".intout:\t.asciz \"\%ld \"");
puts(".strout:\t.asciz \"\%s \"");
puts(".errout:\t.asciz \"Wrong number of arguments\"");
// TODO: Implement the rest
for (uint64_t s = 0; s < stringc; s++)
{
printf(".STR%03ld:\t.asciz %s\n", s, string_list[s]);
}
putchar('\n');
}
void
generate_global_variables ( void )
{
// TODO: Create a .bss section and declare global variables
symbol_t **global_list;
uint64_t no_globals = fetch_symbols(global_names, &global_list);
puts("# GLOBAL VARIABLES");
puts(".bss");
puts(".align 8");
for (uint64_t g = 0; g < no_globals; g++) {
if (global_list[g]->type == SYM_GLOBAL_VAR)
printf(".%s:\n", global_list[g]->name);
}
putchar('\n');
free(global_list);
}
void
generate_function ( symbol_t *function )
{
// TODO: Generate code for declaring and entering function, then generate its body
node_t *func_root = function->node;
LABEL(function->name);
ASM(pushq, %rbp);
ASM(movq, %rsp, %rbp);
putchar('\n');
}
void
@ -122,3 +160,13 @@ generate_main ( symbol_t *first )
puts ( "\tmovq %rax, %rdi" );
puts ( "\tcall exit" );
}
static uint64_t
fetch_symbols(tlhash_t* symbol_table, symbol_t*** symbol_list)
{
uint64_t no_symbols = tlhash_size(symbol_table);
*symbol_list = malloc(no_symbols * sizeof(symbol_t));
tlhash_values(symbol_table, (void **)*symbol_list );
return no_symbols;
}