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#ifndef VM_C
#define VM_C
#include "badlib.h"
#include "compiler.c"
#define N_CONST 256
#define STACK_SIZE MB(4)
typedef struct VM {
Chunk *main;
Chunk *chunk;
u8 stack[STACK_SIZE];
Instruction *ip;
u8 *sp;
u64 *fp;
Constant *regs;
} VM;
void
vm_init(VM *vm, Chunk *chunk) {
assert(vm);
assert(chunk);
assert(chunk->code);
vm->main = chunk;
vm->chunk = chunk;
vm->ip = vm->chunk->code;
vm->fp = (u64 *)vm->stack;
vm->sp = vm->stack + chunk->var_off;
vm->regs = (Constant *)vm->sp;
vm->sp += sizeof(Constant) * chunk->reg_idx;
}
#define OP_UNARY(OP, TYPE) \
do { \
u8 dst = instruction.dst; \
u8 src_a = instruction.a; \
vm->regs[dst].TYPE = OP vm->regs[src_a].TYPE; \
} while (0);
#define OP_UNARY_CONST(OP, TYPE) \
do { \
u8 dst = instruction.dst; \
u8 src_a = instruction.a; \
vm->regs[dst].TYPE = OP vm->chunk->constants[src_a].TYPE; \
} while (0);
#define OP_BINARY(OP, TYPE) \
do { \
u8 dst = instruction.dst; \
u8 src_a = instruction.a; \
u8 src_b = instruction.b; \
vm->regs[dst].TYPE = vm->regs[src_a].TYPE OP vm->regs[src_b].TYPE; \
} while (0);
#define OP_BINARY_CONST(OP, TYPE) \
do { \
u8 dst = instruction.dst; \
u8 src_a = instruction.a; \
u8 src_b = instruction.b; \
vm->regs[dst].TYPE = \
vm->regs[src_a].TYPE OP vm->chunk->constants[src_b].TYPE; \
} while (0);
#include <math.h>
void
vm_run(VM *vm) {
assert(vm);
assert(vm->chunk);
assert(vm->ip);
println("VM running...");
while (true) {
Instruction instruction = *vm->ip++;
#if DEBUG == 1
print("IP: %d -> ", vm->ip - vm->chunk->code - 1);
disassemble_instruction(instruction);
#endif
switch (instruction.op) {
case OP_LD64K: {
u8 dst = instruction.dst;
u8 src_a = instruction.a;
vm->regs[dst].i = vm->chunk->constants[src_a].i;
} break;
case OP_NOT: OP_UNARY(!, i) break;
case OP_BITNOT: OP_UNARY(~, i) break;
case OP_BITOR: OP_BINARY(|, i) break;
case OP_BITXOR: OP_BINARY(^, i) break;
case OP_BITAND: OP_BINARY(&, i) break;
case OP_BITLSHIFT: OP_BINARY(<<, i) break;
case OP_BITRSHIFT: OP_BINARY(>>, i) break;
case OP_EQ: OP_BINARY(==, i) break;
case OP_NEQ: OP_BINARY(!=, i) break;
case OP_LT: OP_BINARY(<, i) break;
case OP_GT: OP_BINARY(>, i) break;
case OP_LE: OP_BINARY(<=, i) break;
case OP_GE: OP_BINARY(>=, i) break;
case OP_AND: OP_BINARY(&&, i) break;
case OP_OR: OP_BINARY(||, i) break;
case OP_ADD: OP_BINARY(+, i) break;
case OP_SUB: OP_BINARY(-, i) break;
case OP_MUL: OP_BINARY(*, i) break;
case OP_DIV: OP_BINARY(/, i) break;
case OP_MOD: OP_BINARY(%, i) break;
case OP_ADDF: OP_BINARY(+, f) break;
case OP_SUBF: OP_BINARY(-, f) break;
case OP_MULF: OP_BINARY(*, f) break;
case OP_DIVF: OP_BINARY(/, f) break;
case OP_MODF: {
u8 dst = instruction.dst;
u8 src_a = instruction.a;
u8 src_b = instruction.b;
vm->regs[dst].f =
fmod(vm->regs[src_a].f, vm->chunk->constants[src_b].f);
} break;
case OP_NOTI: OP_UNARY_CONST(!, i) break;
case OP_BITNOTI: OP_UNARY_CONST(~, i) break;
case OP_BITORI: OP_BINARY_CONST(|, i) break;
case OP_BITXORI: OP_BINARY_CONST(^, i) break;
case OP_BITANDI: OP_BINARY_CONST(&, i) break;
case OP_BITLSHIFTI: OP_BINARY_CONST(<<, i) break;
case OP_BITRSHIFTI: OP_BINARY_CONST(>>, i) break;
case OP_EQI: OP_BINARY_CONST(==, i) break;
case OP_NEQI: OP_BINARY_CONST(!=, i) break;
case OP_LTI: OP_BINARY_CONST(<, i) break;
case OP_GTI: OP_BINARY_CONST(>, i) break;
case OP_LEI: OP_BINARY_CONST(<=, i) break;
case OP_GEI: OP_BINARY_CONST(>=, i) break;
case OP_ANDI: OP_BINARY_CONST(&&, i) break;
case OP_ORI: OP_BINARY_CONST(||, i) break;
case OP_ADDI: OP_BINARY_CONST(+, i) break;
case OP_SUBI: OP_BINARY_CONST(-, i) break;
case OP_MULI: OP_BINARY_CONST(*, i) break;
case OP_DIVI: OP_BINARY_CONST(/, i) break;
case OP_MODI: OP_BINARY_CONST(%, i) break;
case OP_ADDFI: OP_BINARY_CONST(+, f) break;
case OP_SUBFI: OP_BINARY_CONST(-, f) break;
case OP_MULFI: OP_BINARY_CONST(*, f) break;
case OP_DIVFI: OP_BINARY_CONST(/, f) break;
case OP_MODFI: {
u8 dst = instruction.dst;
u8 src_a = instruction.a;
u8 src_b = instruction.b;
vm->regs[dst].f =
fmod(vm->regs[src_a].f, vm->chunk->constants[src_b].f);
} break;
case OP_STGVAR: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->main->vars[dst];
s64 *stack = (s64 *)&vm->stack[var.offset];
*stack = vm->regs[src].i;
} break;
case OP_STGVARI: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->main->vars[dst];
s64 *stack = (s64 *)&vm->stack[var.offset];
*stack = vm->chunk->constants[src].i;
} break;
case OP_LDGVAR: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->main->vars[src];
s64 *stack = (s64 *)&vm->stack[var.offset];
vm->regs[dst].i = *stack;
} break;
case OP_LDGADDR: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->main->vars[src];
s64 *stack = (s64 *)&vm->stack[var.offset];
vm->regs[dst].ptr = (ptrsize)stack;
} break;
case OP_STLVAR: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->chunk->vars[dst];
vm->fp[var.offset / 8] = vm->regs[src].i;
} break;
case OP_STLVARI: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->chunk->vars[dst];
vm->fp[var.offset / 8] = vm->chunk->constants[src].i;
} break;
case OP_LDLVAR: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->chunk->vars[src];
vm->regs[dst].i = vm->fp[var.offset / 8];
} break;
case OP_LDLADDR: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Variable var = vm->chunk->vars[src];
vm->regs[dst].i = (ptrsize)&vm->fp[var.offset / 8];
} break;
case OP_LDSTR: {
u8 dst = instruction.dst;
u8 src = instruction.a;
Str *str = &vm->chunk->strings[src];
vm->regs[dst].ptr = (ptrsize)str;
} break;
case OP_ST64I: {
sz value = vm->regs[instruction.dst].ptr;
s64 *addr = (s64 *)vm->regs[instruction.a].ptr;
sz offset = vm->chunk->constants[instruction.b].i;
addr[offset] = value;
} break;
case OP_ST64: {
sz value = vm->regs[instruction.dst].i;
s64 *addr = (s64 *)vm->regs[instruction.a].ptr;
sz offset = vm->regs[instruction.b].i;
addr[offset] = value;
} break;
case OP_LD64I: {
s64 *addr = (s64 *)vm->regs[instruction.a].ptr;
sz offset = vm->chunk->constants[instruction.b].i;
vm->regs[instruction.dst].i = addr[offset];
} break;
case OP_LD64: {
s64 *addr = (s64 *)vm->regs[instruction.a].ptr;
sz offset = vm->regs[instruction.b].i;
vm->regs[instruction.dst].i = addr[offset];
} break;
case OP_JMP: {
u8 dst = instruction.dst;
sz pos = intintmap_lookup(&vm->chunk->labels, dst)->val;
vm->ip = vm->chunk->code + pos;
} break;
case OP_JMPFI: {
u8 dst = instruction.dst;
sz pos = intintmap_lookup(&vm->chunk->labels, dst)->val;
bool cond = vm->chunk->constants[instruction.a].i;
if (!cond) {
vm->ip = vm->chunk->code + pos;
}
} break;
case OP_JMPTI: {
u8 dst = instruction.dst;
sz pos = intintmap_lookup(&vm->chunk->labels, dst)->val;
bool cond = vm->chunk->constants[instruction.a].i;
if (cond) {
vm->ip = vm->chunk->code + pos;
}
} break;
case OP_JMPF: {
u8 dst = instruction.dst;
sz pos = intintmap_lookup(&vm->chunk->labels, dst)->val;
bool cond = vm->regs[instruction.a].i;
if (!cond) {
vm->ip = vm->chunk->code + pos;
}
} break;
case OP_JMPT: {
u8 dst = instruction.dst;
sz pos = intintmap_lookup(&vm->chunk->labels, dst)->val;
bool cond = vm->regs[instruction.a].i;
if (cond) {
vm->ip = vm->chunk->code + pos;
}
} break;
case OP_MOV64: {
u8 dst = instruction.dst;
u8 src = instruction.a;
vm->regs[dst] = vm->regs[src];
} break;
case OP_MOV32: {
u8 dst = instruction.dst;
u8 src = instruction.a;
vm->regs[dst].i = vm->regs[src].i & 0xFFFFFFFF;
} break;
case OP_MOV16: {
u8 dst = instruction.dst;
u8 src = instruction.a;
vm->regs[dst].i = vm->regs[src].i & 0xFFFF;
} break;
case OP_MOV8: {
u8 dst = instruction.dst;
u8 src = instruction.a;
vm->regs[dst].i = vm->regs[src].i & 0xFF;
} break;
case OP_PRINTS64: {
u8 idx = instruction.dst;
print("%d", vm->regs[idx].i);
} break;
case OP_PRINTS64I: {
u8 idx = instruction.dst;
print("%d", vm->chunk->constants[idx].i);
} break;
case OP_PRINTBOOL: {
u8 idx = instruction.dst;
bool val = vm->regs[idx].i;
if (val) {
print("true");
} else {
print("false");
}
} break;
case OP_PRINTBOOLI: {
u8 idx = instruction.dst;
bool val = vm->chunk->constants[idx].i;
if (val) {
print("true");
} else {
print("false");
}
} break;
case OP_PRINTF64: {
u8 idx = instruction.dst;
printf("%f", vm->regs[idx].f);
} break;
case OP_PRINTF64I: {
u8 idx = instruction.dst;
printf("%f", vm->chunk->constants[idx].f);
} break;
case OP_PRINTSTR: {
u8 idx = instruction.dst;
Str *string = (Str *)vm->regs[idx].ptr;
print("%s", *string);
} break;
case OP_PRINTSTRI: {
u8 idx = instruction.dst;
Str string = vm->chunk->strings[idx];
print("%s", string);
} break;
case OP_RESERVE: {
sz offset = vm->chunk->constants[instruction.dst].i;
vm->sp += offset;
} break;
case OP_PUSH: {
sz val = vm->regs[instruction.dst].i;
u64 *p = (u64 *)vm->sp;
*p = val;
vm->sp += sizeof(ptrsize);
} break;
case OP_PUSHI: {
sz val = vm->chunk->constants[instruction.dst].i;
u64 *p = (u64 *)vm->sp;
*p = val;
vm->sp += sizeof(ptrsize);
} break;
case OP_POP: {
vm->sp -= sizeof(ptrsize);
u64 *p = (u64 *)vm->sp;
vm->regs[instruction.dst].i = *p;
} break;
case OP_PUTRET: {
sz val = vm->regs[instruction.dst].i;
vm->fp[-1] = val;
} break;
case OP_PUTRETI: {
sz val = vm->chunk->constants[instruction.dst].i;
vm->fp[-1] = val;
} break;
case OP_CALL: {
u8 dst = instruction.dst;
Chunk *func = vm->main->functions[dst];
ptrsize chunk_addr = (ptrsize)vm->chunk;
ptrsize ip_addr = (ptrsize)vm->ip;
ptrsize reg_addr = (ptrsize)vm->regs;
ptrsize old_fp = (ptrsize)vm->fp;
// Allocate space for the locals.
memset(vm->sp, 0, func->var_off - func->param_off);
vm->fp = (u64 *)(vm->sp - func->param_off);
vm->sp += func->var_off - func->param_off;
vm->chunk = func;
vm->ip = func->code;
vm->regs = (Constant *)vm->sp;
// Allocate registers.
vm->sp += sizeof(Constant) * func->reg_idx;
// Store memory addresses we need to return to this function.
u64 *p = (u64 *)vm->sp;
p[0] = chunk_addr;
p[1] = ip_addr;
p[2] = reg_addr;
p[3] = old_fp;
vm->sp += sizeof(ptrsize) * 4;
} break;
case OP_RECUR: {
vm->ip = vm->chunk->code;
} break;
case OP_RET: {
u64 *p = (u64 *)vm->sp;
ptrsize chunk_addr = p[-4];
ptrsize ip_addr = p[-3];
ptrsize reg_addr = p[-2];
ptrsize old_fp = p[-1];
vm->sp -= sizeof(ptrsize) * 4;
// Deallocate registers.
vm->sp -= sizeof(Constant) * vm->chunk->reg_idx;
// Deallocate locals.
vm->sp -= vm->chunk->var_off;
// Restore previous activation record.
vm->regs = (Constant *)reg_addr;
vm->ip = (Instruction *)ip_addr;
vm->chunk = (Chunk *)chunk_addr;
vm->fp = (u64 *)old_fp;
} break;
case OP_HALT: {
println("VM halt...");
if (instruction.a != 0) {
println("Result:");
Constant result = vm->regs[instruction.dst];
printf("\tint -> %lld\n", result.i);
printf("\tfloat -> %.10e\n", result.f);
printf("\thex -> %llx\n", (u64)result.i);
println("\tbinary -> %b", result.i);
}
return;
}
default: {
// eprintln("unimplemented OP code: %d", instruction.op);
eprintln("unimplemented OP code: %s", op_str[instruction.op]);
return;
}
}
}
}
#endif // VM_C
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