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#ifndef BDL_IR_H
#define BDL_IR_H
typedef struct LineInfo {
size_t line;
size_t col;
} LineInfo;
typedef enum Op {
// Arithmetic ops.
// - Binary operations.
// - Arguments are passed via the stack.
OP_ADD,
OP_SUB,
OP_MUL,
OP_DIV,
OP_MOD,
// Stack ops.
// - Requires an Object to push into the stack.
OP_PUSH,
// - Discards the last value in the stack.
OP_DROP,
// Jump/conditional ops.
// - Take a label as argument.
// - For conditional jumps, the last value in the stack is used.
OP_JUMP,
OP_JUMP_IF_FALSE,
// Primitive complex commands.
// - Prints the last object in the stack.
OP_PRINT,
// Procedures.
// - Requires a function name as parameter.
OP_CALL,
// - Return position is on a know location of the stack based on the offset
// of locals, parameters, etc.
OP_RETURN,
// TODO: add remaining ops.
} Op;
static const char* ops_str[] = {
[OP_ADD] = "OP_ADD",
[OP_SUB] = "OP_SUB",
[OP_MUL] = "OP_MUL",
[OP_DIV] = "OP_DIV",
[OP_MOD] = "OP_MOD",
[OP_PUSH] = "OP_PUSH",
[OP_DROP] = "OP_DROP",
[OP_JUMP] = "OP_JUMP",
[OP_JUMP_IF_FALSE] = "OP_JUMP_IF_FALSE",
[OP_PRINT] = "OP_PRINT",
[OP_CALL] = "OP_CALL",
[OP_RETURN] = "OP_RETURN",
};
typedef struct Instruction {
Op op;
Object *argument;
// Original line/column for debugging purposes.
size_t line;
size_t col;
} Instruction;
typedef struct Procedure {
// Procedure name.
char *name;
// Program code.
Instruction *instructions;
// Number of locals and parameters.
size_t n_params;
size_t n_locals;
} Procedure;
typedef struct ProgramIr {
Procedure **procedures;
Object **constants;
} ProgramIr;
void
print_instruction(Instruction *instruction) {
printf("%4ld:%-4ld ", instruction->line, instruction->col);
Op op = instruction->op;
switch (op) {
case OP_PUSH: {
printf("%-16s -> ", ops_str[op]);
OBJ_PRINT(instruction->argument);
} break;
default: {
printf("%s\n", ops_str[op]);
} break;
}
}
void
print_procedure(Procedure *proc) {
printf("===== %.*s =====\n", (int)array_size(proc->name), proc->name);
printf("code:\n");
for (size_t i = 0; i < array_size(proc->instructions); ++i) {
print_instruction(&proc->instructions[i]);
}
}
Procedure *
proc_alloc(ProgramIr *program, StringView name) {
Procedure *proc = calloc(1, sizeof(Procedure));
array_init(proc->name, name.n);
array_insert(proc->name, name.start, name.n);
array_init(proc->instructions, 0);
array_push(program->procedures, proc);
return proc;
}
void
compile_object(ProgramIr *program, Procedure *proc, Object *obj) {
switch (obj->type) {
case OBJ_TYPE_NIL:
case OBJ_TYPE_TRUE:
case OBJ_TYPE_FALSE:
case OBJ_TYPE_STRING:
case OBJ_TYPE_FIXNUM: {
Instruction inst = (Instruction){OP_PUSH, obj, obj->line, obj->col};
array_push(proc->instructions, inst);
} break;
// case OBJ_TYPE_PAIR: { compile_proc_call(obj); } break;
// case OBJ_TYPE_IF: { compile_if(obj); } break;
// case OBJ_TYPE_LAMBDA: { compile_lambda(obj); } break;
// case OBJ_TYPE_DEF: { compile_def(obj); } break;
// case OBJ_TYPE_SYMBOL: { compile_symbol(obj); } break;
default: break;
}
}
ProgramIr
compile(Program program) {
ProgramIr program_ir = {0};
array_init(program_ir.procedures, 0);
array_init(program_ir.constants, 0);
Procedure *main = proc_alloc(&program_ir, STRING("main"));
for (size_t i = 0; i < array_size(program.roots); i++) {
Object *root = program.roots[i];
compile_object(&program_ir, main, root);
}
// DEBUG:...
for (size_t i = 0; i < array_size(program_ir.procedures); ++i) {
print_procedure(program_ir.procedures[i]);
}
return program_ir;
}
#endif // BDL_IR_H
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