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typedef enum Operator {
// Arithmetic ops.
OP_ADD,
OP_SUB,
OP_MUL,
OP_DIV,
OP_MOD,
// Load/store/copy operations.
OP_LD8,
OP_LD16,
OP_LD32,
OP_LD64,
OP_ST8,
OP_ST16,
OP_ST32,
OP_ST64,
OP_CP8,
OP_CP16,
OP_CP32,
OP_CP64,
// Bit fiddling operations.
OP_NOT,
OP_AND,
OP_OR,
OP_XOR,
OP_LSHIFT,
OP_RSHIFT,
OP_LROT,
OP_RROT,
// (Un)conditional jump operations.
OP_LABEL,
OP_JMP,
OP_JMP_EQ,
OP_JMP_NEQ,
OP_JMP_GT,
OP_JMP_LT,
OP_JMP_GE,
OP_JMP_LE,
} Operator;
typedef enum OperandType {
OP_TYPE_REG,
OP_TYPE_CONST,
OP_TYPE_LABEL,
} OperandType;
static size_t reg_gen_id = 0;
static size_t lab_gen_id = 0;
#define NEW_REG() (Operand){ .type = OP_TYPE_REG, .id = reg_gen_id++ }
#define NEW_LAB() (Operand){ .type = OP_TYPE_LABEL, .id = lab_gen_id++ }
#define NEW_S64(C) (Operand){ .type = OP_TYPE_CONST, .constant.sval = (C) }
#define EMIT_0(PROGRAM, LINE, OP, DST) do { \
Instruction inst = (Instruction){ \
.op = (OP), \
.dst = (DST), \
}; \
array_push((PROGRAM)->inst, inst); \
array_push((PROGRAM)->lines, (LINE)); \
} while(false);
#define EMIT_1(PROGRAM, LINE, OP, DST, A) do { \
Instruction inst = (Instruction){ \
.op = (OP), \
.dst = (DST), \
.src_a = (A), \
}; \
array_push((PROGRAM)->inst, inst); \
array_push((PROGRAM)->lines, (LINE)); \
} while(false);
#define EMIT_2(PROGRAM, LINE, OP, DST, A, B) do { \
Instruction inst = (Instruction){ \
.op = (OP), \
.dst = (DST), \
.src_a = (A), \
.src_b = (B), \
}; \
array_push((PROGRAM)->inst, inst); \
array_push((PROGRAM)->lines, (LINE)); \
} while(false);
typedef struct Operand {
OperandType type;
union {
// REG/LABEL
size_t id;
// s64 constant;
struct {
union {
u64 uval;
s64 sval;
};
} constant;
};
} Operand;
typedef struct Instruction {
Operator op;
Operand dst;
Operand src_a;
Operand src_b;
} Instruction;
typedef struct LineInfo {
size_t line;
size_t col;
} LineInfo;
typedef struct ProgramBASM {
Instruction *inst;
LineInfo *lines;
} ProgramBASM;
Operand emit_basm(ProgramBASM *program, Node *node);
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];
Operand reg_dst = NEW_REG();
reg_b = emit_basm(program, arg);
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;
}
// TODO: emit_if
// TODO: emit_and
// TODO: emit_or
// TODO: emit_not
// TODO: emit_global
// TODO: emit_local
// TODO: emit_procedure
// TODO: emit_proc_call
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;
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];
emit_basm(program, root);
}
return program;
}
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