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#include "irm.h"
#include <assert.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <backend.h>
#include <x86.h>
#define STACK_SUB(irm, syment, type) \
do { \
irm->stackdepth += sizeof(type); \
syment->loc = irm->stackdepth; \
syment->len = sizeof(type); \
while(0)
// TODO: Add scopes.
void irm_init(struct irm *irm)
{
assert(irm != NULL);
irm->storage = malloc(1024 * 1024); // TODO: platform-agnostic
irm->size = (1024 * 1024) / 8;
irm->curr_pos = 0;
irm->state = IRM_GRACEFUL;
symtab_init(&irm->symtab);
}
void irm_panic(struct irm *irm)
{
irm->state = IRM_PANIC;
}
void irm_stmt_enter_scope(struct irm *irm)
{
assert(irm != NULL);
// Append 1 level.
}
void irm_stmt_leave_scope(struct irm *irm)
{
assert(irm != NULL);
}
void irm_stmt_var_decl(struct irm *irm, size_t *offset)
{
uint64_t* mem = irm->storage;
uint64_t ltype = mem[*offset];
(*offset)++;
uint64_t symbol_type = mem[*offset];
if(symbol_type != SYM_VAR) {
DIE("Symbol type invalid! sym:'%x'", symbol_type);
}
(*offset)++;
uint64_t symid = mem[*offset];
if(irm->symtab.count < symid) {
DIE("Symbol id: '%d' not found! This is a compiler bug.\n",
symid);
}
struct symbol_entry *syment = &irm->symtab.entries[symid];
irm->stackdepth += sizeof(uint64_t);
syment->loc = irm->stackdepth;
DEBUG("Symbol id: %d\n", symid);
(*offset)++;
(*offset)++;
switch(ltype) {
case VAR_DECL_QWORD: {
uint64_t value = mem[*offset];
syment->len = sizeof(uint64_t);
(*offset)++;
x86_mov_r_i64(RAX, value);
x86_push_r64(RAX);
break;
}
case VAR_DECL_DWORD: {
uint64_t value = mem[*offset];
syment->len = sizeof(uint32_t);
(*offset)++;
x86_push_i32(value);
break;
}
case VAR_DECL_WORD: {
uint64_t value = mem[*offset];
syment->len = sizeof(uint32_t);
(*offset)++;
x86_push_i32(value); // TODO: Replace with immediate 16 instruction
break;
}
case VAR_DECL_BYTE: {
uint64_t value = mem[*offset];
(*offset)++;
syment->len = sizeof(uint16_t);
x86_push_i8(value);
break;
}
default:
DIE("Invalid type supplied! This is a compiler bug. type: %x.\n"
, ltype);
break;
}
}
void irm_stmt_var_assign(struct irm *irm, size_t *offset)
{
assert(irm != NULL);
if(offset == NULL) {
DIE("offset must not be null!");
}
(*offset)++;
uint64_t sym_id = irm->storage[*offset];
if(sym_id != SYM_VAR) {
DIE("Variable assignment only supports a symbol of type variable!");
}
(*offset)++;
uint64_t symtab_id = irm->storage[*offset];
struct symbol_entry *ent = &irm->symtab.entries[symtab_id];
if(ent->symtype != SYM_VAR) {
DIE("Symbol '%.*s' is not of type variable!", ent->name.len, ent->name.buf);
}
(*offset)++;
uint64_t value_type = irm->storage[*offset];
switch(value_type) {
case NUMBER64: { // FIX STACK ISSUE
DIE("TODO:: STACK ALGINMENT ISSUE!!");
(*offset)++;
uint64_t value = irm->storage[*offset];
DEBUG("Assigned nr64 literal %d to '%.*s'.\n", value, ent->name.len, ent->name.buf);
(*offset)++;
// TODO: mov [rsp - X], value
// mov rax, rsp
emit8(0x48);
emit8(0x8B); // MR
emit8(0xC4); // rsp -> rax
// sub rax, 8
emit8(0x48);
emit8(0x2d);
emit32(ent->loc);
// mov rbx, value
emit8(0x48);
emit8(0xBB); // b8 + rd
emit64(value); // FALSE VALUE!! FIX!
// mov qword ptr [rax], rbx
emit8(0x48);
emit8(0x89); // MR
emit8(0x18); // rbx -> [rax]
break;
}
default:
DIE("Variable assignment only supports a number literal!");
}
}
void irm_stmt_done(struct irm *irm)
{
if(irm->state == IRM_PANIC) return;
size_t offset = 0;
while(offset < irm->curr_pos - 1) {
uint64_t type = irm->storage[offset];
type &= 0xFFFF0000;
switch(type) {
case VAR_DECL:
irm_stmt_var_decl(irm, &offset);
break;
case VAR_ASSIGN:
irm_stmt_var_assign(irm, &offset);
break;
default:
DIE("Statement identifier not found: %d.", type);
break;
}
DEBUG("Offset: %d, Size: %d\n", offset, irm->curr_pos);
}
if(irm->storage[offset] != STMT_DONE) {
DIE("Statement done was not received! This is a compiler bug.");
}
memset(irm->storage, 0, irm->curr_pos);
irm->curr_pos = 0;
}
void irm_push(struct irm *irm, uint64_t type)
{
assert(irm != NULL);
uint64_t *mem = irm->storage + irm->curr_pos;
mem[0] = type;
irm->curr_pos += 1;
DEBUG("added %x to irm.\n", type);
}
void irm_push_64v(struct irm *irm, uint64_t type, uint64_t value)
{
assert(irm != NULL);
if(irm->curr_pos + 2 > irm->size)
DIE("IRM OVERFLOW!");
uint64_t* mem = irm->storage + irm->curr_pos;
mem[0] = type;
mem[1] = value;
irm->curr_pos += 2;
DEBUG("added %d to irm with value %d.\n", type, value);
}
void irm_push_lookup_sym(struct irm *irm, uint64_t type, struct string_view sym)
{
assert(irm != NULL);
uint64_t *mem = irm->storage + irm->curr_pos;
mem[0] = type;
struct symlookup_result ent = symtab_lookup(&irm->symtab, sym);
if(ent.ent == NULL) {
DIE("'%.*s' not found!", sym.len, sym.buf);
}
mem[1] = ent.i;
irm->curr_pos+=2;
}
// TODO:
// 1. Push SYM_TYPE
// 2. Push SYMTAB offset (after adding the sym to it)
void irm_push_sym(struct irm *irm, uint64_t type, struct string_view sym)
{
assert(irm != NULL);
struct symbol_entry entry;
entry.name = sym;
entry.loc = 0;
entry.symtype = type;
if(symtab_lookup(&irm->symtab, sym).ent != NULL) {
DIE("Symbol '%.*s' already exists.\n", sym.len, sym.buf);
}
size_t symindex = symtab_append(&irm->symtab, entry);
uint64_t* mem = irm->storage + irm->curr_pos;
mem[0] = type;
mem[1] = symindex;
irm->curr_pos += 2;
DEBUG("added %.*s to symbol table.\n", sym.len, sym.buf);
}
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