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#include "ir.h"
static size_t reg_gen_id = 0;
static size_t lab_gen_id = 0;
Operand
emit_arith(ProgramBASM *program, Node *node, Operator op) {
LineInfo line = (LineInfo){
.line = node->line,
.col = node->col,
};
Operand reg_a = emit_basm(program, node->builtin.args[0]);
Operand reg_b;
for (size_t i = 1; i < array_size(node->builtin.args); ++i) {
Node *arg = node->builtin.args[i];
reg_b = emit_basm(program, arg);
Operand reg_dst = NEW_REG();
EMIT_2(program, line, op, reg_dst, reg_a, reg_b);
reg_a = reg_dst;
}
return reg_a;
}
Operand
emit_numcomp(ProgramBASM *program, Node *node, Operator op) {
LineInfo line = (LineInfo){
.line = node->line,
.col = node->col,
};
Operand label_false = NEW_LAB();
Operand label_end = NEW_LAB();
Operand reg_a = emit_basm(program, node->builtin.args[0]);
Operand reg_b;
for (size_t i = 1; i < array_size(node->builtin.args); ++i) {
Node *arg = node->builtin.args[i];
reg_b = emit_basm(program, arg);
EMIT_2(program, line, op, label_false, reg_a, reg_b);
reg_a = reg_b;
}
Operand reg_out = NEW_REG();
EMIT_1(program, line, OP_LD8, reg_out, NEW_S64(1));
EMIT_0(program, line, OP_JMP, label_end);
EMIT_0(program, line, OP_LABEL, label_false);
EMIT_1(program, line, OP_LD8, reg_out, NEW_S64(0));
EMIT_0(program, line, OP_LABEL, label_end);
return reg_out;
}
Operand
emit_builtin(ProgramBASM *program, Node *node) {
switch (node->builtin.type) {
case TOKEN_ADD: { return emit_arith(program, node, OP_ADD); } break;
case TOKEN_SUB: { return emit_arith(program, node, OP_SUB); } break;
case TOKEN_MUL: { return emit_arith(program, node, OP_MUL); } break;
case TOKEN_DIV: { return emit_arith(program, node, OP_DIV); } break;
case TOKEN_MOD: { return emit_arith(program, node, OP_MOD); } break;
case TOKEN_EQ: { return emit_numcomp(program, node, OP_JMP_NEQ); } break;
case TOKEN_LT: { return emit_numcomp(program, node, OP_JMP_GE); } break;
case TOKEN_GT: { return emit_numcomp(program, node, OP_JMP_LE); } break;
case TOKEN_LE: { return emit_numcomp(program, node, OP_JMP_GT); } break;
case TOKEN_GE: { return emit_numcomp(program, node, OP_JMP_LT); } break;
default: {
push_error(ERR_TYPE_BASM, ERR_UNIMPLEMENTED, node->line, node->col);
return (Operand){0};
} break;
}
}
Operand
emit_number(ProgramBASM *program, Node *node) {
// TODO: ldX depending on type of number.
LineInfo line = (LineInfo){.line = node->line, .col = node->col};
Operand reg_dst = NEW_REG();
Operand num = NEW_S64(node->number.integral);
EMIT_1(program, line, OP_LD64, reg_dst, num);
return reg_dst;
}
Operand
emit_bool(ProgramBASM *program, Node *node) {
LineInfo line = (LineInfo){.line = node->line, .col = node->col};
Operand reg_dst = NEW_REG();
Operand val;
if (node->boolean) {
val = NEW_S64(1);
} else {
val = NEW_S64(0);
}
EMIT_1(program, line, OP_LD8, reg_dst, val);
return reg_dst;
}
Operand
emit_if(ProgramBASM *program, Node *node) {
LineInfo line = (LineInfo){.line = node->line, .col = node->col};
Operand label_false = NEW_LAB();
Operand label_end = NEW_LAB();
// If type of expression is `void`, there is nothing to return. Don't
// generate a new register or copy output.
Operand reg_out = (Operand){0};
if (node->expr_type != &default_types[TYPE_VOID]) {
reg_out = NEW_REG();
}
Operand cond = emit_basm(program, node->ifexpr.cond);
EMIT_1(program, line, OP_JMP_FALSE, label_false, cond);
Operand ret_true = emit_basm(program, node->ifexpr.expr_true);
if (node->ifexpr.expr_false != NULL) {
if (node->expr_type != &default_types[TYPE_VOID]) {
EMIT_1(program, line, OP_CP64, reg_out, ret_true); // TODO: depends on the type of output
}
EMIT_0(program, line, OP_JMP, label_end);
EMIT_0(program, line, OP_LABEL, label_false);
Operand ret_false = emit_basm(program, node->ifexpr.expr_false);
if (node->expr_type != &default_types[TYPE_VOID]) {
EMIT_1(program, line, OP_CP64, reg_out, ret_false); // TODO: depends on the type of output
}
EMIT_0(program, line, OP_LABEL, label_end);
} else {
EMIT_0(program, line, OP_LABEL, label_false);
}
return reg_out;
}
// TODO: emit_and
// TODO: emit_or
// TODO: emit_not
// TODO: emit_block
// TODO: emit_procedure
// TODO: emit_local_vars
// TODO: emit_param_vars
// TODO: emit_proc_call
// TODO: emit_global_vars
Operand
emit_basm(ProgramBASM *program, Node *node) {
switch (node->type) {
case NODE_BOOL: { return emit_bool(program, node); } break;
case NODE_NUMBER: { return emit_number(program, node); } break;
case NODE_BUILTIN: { return emit_builtin(program, node); } break;
case NODE_IF: { return emit_if(program, node); } break;
default: {
push_error(ERR_TYPE_BASM, ERR_UNIMPLEMENTED, node->line, node->col);
return (Operand){0};
} break;
}
}
ProgramBASM *
generate_basm(ParseTree *parse_tree) {
ProgramBASM *program = malloc(sizeof(ProgramBASM));
array_init(program->inst, 0);
array_init(program->lines, 0);
for (size_t i = 0; i < array_size(parse_tree->roots); ++i) {
Node *root = parse_tree->roots[i];
Operand ret = emit_basm(program, root);
LineInfo line = (LineInfo){.line = root->line, .col = root->col};
EMIT_0(program, line, OP_RETURN, ret);
}
return program;
}
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