From 36680f5c8d9f0b499466cbf429dcb97941cbe117 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=98yvind?= <oyvindskaaden@gmail.com>
Date: Thu, 31 Mar 2022 23:12:12 +0200
Subject: [PATCH] Finished two of the generator parts - string table -global
 vars

beginnings of function
---
 exercises/05/vslc/src/generator.c | 56 ++++++++++++++++++++++++++++---
 1 file changed, 52 insertions(+), 4 deletions(-)

diff --git a/exercises/05/vslc/src/generator.c b/exercises/05/vslc/src/generator.c
index 6896772..9b12a26 100644
--- a/exercises/05/vslc/src/generator.c
+++ b/exercises/05/vslc/src/generator.c
@@ -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;
+}