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Somewhat working, pre leave rax on stack

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Øyvind Skaaden 2022-04-21 21:20:40 +02:00
parent ef76abe453
commit 419f753847
1 changed files with 55 additions and 26 deletions
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77
exercises/06/vslc/src/generator.c
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@ -2,10 +2,16 @@
#define ASM(opcode, args...) puts("\t"#opcode"\t"#args) #define ASM(opcode, args...) puts("\t"#opcode"\t"#args)
#define LABEL(label) printf("_%s:\n", (char*)label) #define LABEL(label) printf("_%s:\n", (char*)label)
#define COMMENT(format, args...) printf("# "format"\n", ##args)
#define PUSH(param) printf("\tpushq\t%s\t\t\t\t# Scope depth: %ld\n", #param, ++scope_depth)
#define POP(param) printf("\tpopq\t%s\t\t\t\t# Scope depth: %ld\n", #param, --scope_depth)
#define NO_REG_RECORD 6 #define NO_REG_RECORD 6
#define NO_CALLE_SAVED_REG 10 #define NO_CALLE_SAVED_REG 10
uint64_t scope_depth = 0;
/**Generate table of strings in a rodata section. */ /**Generate table of strings in a rodata section. */
void generate_stringtable ( void ); void generate_stringtable ( void );
/**Declare global variables in a bss section */ /**Declare global variables in a bss section */
@ -145,7 +151,7 @@ generate_stringtable ( void )
* error msg. from main * error msg. from main
*/ */
puts("# DATA SECTION"); puts("# DATA SECTION");
puts(".data"); puts(".section .data");
puts(".intout:\t.asciz \"\%ld \""); puts(".intout:\t.asciz \"\%ld \"");
puts(".strout:\t.asciz \"\%s \""); puts(".strout:\t.asciz \"\%s \"");
puts(".errout:\t.asciz \"Wrong number of arguments\""); puts(".errout:\t.asciz \"Wrong number of arguments\"");
@ -182,15 +188,16 @@ generate_function ( symbol_t *function )
// TODO: Generate code for declaring and entering function, then generate its body // TODO: Generate code for declaring and entering function, then generate its body
printf("# func %s(nparams: %ld)\n", function->name, function->nparms); printf("# func %s(nparams: %ld)\n", function->name, function->nparms);
puts(".text"); puts(".section .text");
printf(".global _%s\n", function->name); printf(".global _%s\n", function->name);
LABEL(function->name); LABEL(function->name);
ASM(pushq, %rbp); //ASM(pushq, %rbp);
PUSH(%rbp);
ASM(movq, %rsp, %rbp); ASM(movq, %rsp, %rbp);
// Push params to stack // Push params to stack
for (int arg = 0; arg < MIN(NO_REG_RECORD,function->nparms); arg++) for (int arg = 0; arg < MIN(NO_REG_RECORD,function->nparms); arg++)
printf("\tpushq\t%s\n", record[arg] ); printf("\tpushq\t%s\t\t\t\t# Scope depth: %ld\n", record[arg], ++scope_depth);
// How many local variables are inside function // How many local variables are inside function
uint64_t no_locals = function->locals->size - function->nparms; uint64_t no_locals = function->locals->size - function->nparms;
@ -198,11 +205,13 @@ generate_function ( symbol_t *function )
// IF the stack alignment is not 16 bytes, // IF the stack alignment is not 16 bytes,
// add one now as all local var also is 0 // add one now as all local var also is 0
if ((MIN(6,function->nparms) + no_locals) % 2) if ((MIN(6,function->nparms) + no_locals) % 2)
ASM(pushq, $0); PUSH($0);
//ASM(pushq, $0);
// Make room for the local vars // Make room for the local vars
while(no_locals--) while(no_locals--)
ASM(pushq, $0); PUSH($0);
//ASM(pushq, $0);
// Now the stack ptr should be 16 byte aligned. // Now the stack ptr should be 16 byte aligned.
@ -224,7 +233,8 @@ generate_node ( node_t *node)
{ {
case ASSIGNMENT_STATEMENT: case ASSIGNMENT_STATEMENT:
solve_expressions(node->children[1]); solve_expressions(node->children[1]);
ASM(popq, %rax); //ASM(popq, %rax);
POP(%rax);
writeback_variable(node->children[0], "%rax"); writeback_variable(node->children[0], "%rax");
break; break;
@ -311,7 +321,8 @@ generate_print(node_t* node)
{ {
case EXPRESSION: case EXPRESSION:
solve_expressions(curr_print); solve_expressions(curr_print);
ASM(popq, %rax); //ASM(popq, %rax);
POP(%rax);
ASM(movq, $.intout, %rdi); ASM(movq, $.intout, %rdi);
ASM(movq, %rax, %rsi); ASM(movq, %rax, %rsi);
break; break;
@ -328,14 +339,19 @@ generate_print(node_t* node)
default: default:
break; break;
} }
PUSH(%rax);
ASM(movq, $0, %rax);
COMMENT("Actual print. Stack size: %ld", scope_depth);
ASM(call, printf); ASM(call, printf);
POP(%rax);
} }
// Adds a newline // Adds a newline
PUSH(%rax);
ASM(movq, $0, %rax);
ASM(movq, $'\n', %rdi); ASM(movq, $'\n', %rdi);
ASM(call, putchar); ASM(call, putchar);
POP(%rax);
//ASM(popq, %rsi);
//ASM(popq, %rdi);
} }
@ -407,17 +423,20 @@ solve_expressions(node_t *node)
{ {
case IDENTIFIER_DATA: case IDENTIFIER_DATA:
fetch_variable(node, "%rax"); fetch_variable(node, "%rax");
ASM(pushq, %rax); PUSH(%rax);
//ASM(pushq, %rax);
break; break;
case NUMBER_DATA: case NUMBER_DATA:
printf("\tmovq\t$%ld,%%rax\n",*(int64_t*)node->data); printf("\tmovq\t$%ld,%%rax\n",*(int64_t*)node->data);
ASM(pushq, %rax); PUSH(%rax);
//ASM(pushq, %rax);
break; break;
} }
break; break;
case 1: case 1:
solve_expressions(node->children[0]); solve_expressions(node->children[0]);
ASM(popq, %rax); //ASM(popq, %rax);
POP(%rax);
switch (*(char*)node->data) switch (*(char*)node->data)
{ {
@ -428,7 +447,8 @@ solve_expressions(node_t *node)
ASM(notq, %rax); ASM(notq, %rax);
break; break;
} }
ASM(pushq, %rax); //ASM(pushq, %rax);
PUSH(%rax);
break; break;
case 2: case 2:
@ -440,9 +460,11 @@ solve_expressions(node_t *node)
// Put rhs in %r10 // Put rhs in %r10
ASM(popq, %r10); //ASM(popq, %r10);
POP(%r10);
// put lhs in %rax // put lhs in %rax
ASM(popq, %rax); //ASM(popq, %rax);
POP(%rax);
switch (*(char*)node->data) switch (*(char*)node->data)
{ {
@ -460,7 +482,8 @@ solve_expressions(node_t *node)
} }
// Push result to stack. // Push result to stack.
ASM(pushq, %rax); //ASM(pushq, %rax);
PUSH(%rax);
break; break;
} }
} }
@ -490,22 +513,26 @@ generate_function_call(node_t *node)
for (int arg = arg_list->n_children - 1; arg >= NO_REG_RECORD; arg--) for (int arg = arg_list->n_children - 1; arg >= NO_REG_RECORD; arg--)
{ {
if (arg_list->children[arg]->type == NUMBER_DATA) if (arg_list->children[arg]->type == NUMBER_DATA)
printf("\tpushq\t$%ld\n", printf("\tpushq\t$%ld\t\t\t\t# Scope depth: %ld\n",
*(int64_t*)arg_list->children[arg]->data *(int64_t*)arg_list->children[arg]->data,
++scope_depth
); );
else else
{ {
printf("\tpushq\t"); printf("\tpushq\t");
generate_var_ident(arg_list->children[arg]); generate_var_ident(arg_list->children[arg]);
printf("\t\t\t\t# Scope depth: %ld", ++scope_depth);
putchar('\n'); putchar('\n');
} }
} }
if (arg_list->n_children % 2) if (arg_list->n_children % 2)
ASM(pushq, $0); PUSH($0);
//ASM(pushq, $0);
} }
printf("\tcall\t_%s\n", (char*)node->children[0]->data); printf("\tcall\t_%s\n", (char*)node->children[0]->data);
ASM(pushq, %rax); PUSH(%rax);
//ASM(pushq, %rax);
printf("# End of function call\n"); printf("# End of function call\n");
/* /*
@ -527,7 +554,8 @@ void
generate_function_return(node_t *node) generate_function_return(node_t *node)
{ {
solve_expressions(node->children[0]); solve_expressions(node->children[0]);
ASM(popq, %rax); //ASM(popq, %rax);
POP(%rax);
ASM(leave); ASM(leave);
ASM(ret); ASM(ret);
} }
@ -540,7 +568,8 @@ solve_statements(node_t *node, char *operator)
solve_expressions(node); solve_expressions(node);
ASM(popq, %rax); //ASM(popq, %rax);
POP(%rax);
writeback_variable(node->children[0], "%rax"); writeback_variable(node->children[0], "%rax");
} }