Interpreter - call internal procedures

1 files changed, 575 insertions, 0 deletions

diff --git a/src/vm/vm.cpp b/src/vm/vm.cpp
new file mode 100644
index 000000000..e806bcdfb
--- /dev/null
+++ b/src/vm/vm.cpp
@@ -0,0 +1,575 @@
+struct VirtualMachine;
+
+struct vmValueProc {
+	ssaProcedure *proc; // If `NULL`, use `ptr` instead and call external procedure
+	void *        ptr;
+};
+
+
+struct vmValue {
+	// NOTE(bill): Shouldn't need to store type here as the type checking
+	// has already been handled in the SSA
+	union {
+		f32            val_f32;
+		f64            val_f64;
+		void *         val_ptr;
+		i64            val_int;
+		vmValueProc    val_proc;
+		Array<vmValue> val_comp; // NOTE(bill): Will be freed through stack
+	};
+};
+
+vmValue vm_make_value_ptr(void *ptr) {
+	vmValue v = {};
+	v.val_ptr = ptr;
+	return v;
+}
+
+
+struct vmFrame {
+	VirtualMachine *  vm;
+	vmFrame *         caller;
+	ssaProcedure *    curr_proc;
+	ssaBlock *        curr_block;
+	isize             instr_index;
+
+	Map<vmValue>      values; // Key: ssaValue *
+	gbTempArenaMemory temp_arena_memory;
+	gbAllocator       stack_allocator;
+	Array<void *>     locals; // Memory to locals
+	vmValue           result;
+};
+
+struct VirtualMachine {
+	ssaModule *         module;
+	gbArena             stack_arena;
+	gbAllocator         stack_allocator;
+	gbAllocator         heap_allocator;
+	Array<vmFrame>      frame_stack;
+	Map<vmValue>        globals;    // Key: ssaValue *
+	vmValue             exit_value;
+};
+
+void vm_exec_instr(VirtualMachine *vm, ssaValue *value);
+
+vmFrame *vm_back_frame(VirtualMachine *vm) {
+	if (vm->frame_stack.count > 0) {
+		return &vm->frame_stack[vm->frame_stack.count-1];
+	}
+	return NULL;
+}
+
+
+
+void vm_init(VirtualMachine *vm, ssaModule *module) {
+	gb_arena_init_from_allocator(&vm->stack_arena, heap_allocator(), gb_megabytes(64));
+
+	vm->module = module;
+	vm->stack_allocator = gb_arena_allocator(&vm->stack_arena);
+	vm->heap_allocator = heap_allocator();
+	array_init(&vm->frame_stack, vm->heap_allocator);
+	map_init(&vm->globals, vm->heap_allocator);
+}
+void vm_destroy(VirtualMachine *vm) {
+	array_free(&vm->frame_stack);
+	map_destroy(&vm->globals);
+	gb_arena_free(&vm->stack_arena);
+}
+
+
+
+
+
+i64 vm_type_size_of(VirtualMachine *vm, Type *type) {
+	return type_size_of(vm->module->sizes, vm->heap_allocator, type);
+}
+i64 vm_type_align_of(VirtualMachine *vm, Type *type) {
+	return type_align_of(vm->module->sizes, vm->heap_allocator, type);
+}
+i64 vm_type_offset_of(VirtualMachine *vm, Type *type, i64 offset) {
+	return type_offset_of(vm->module->sizes, vm->heap_allocator, type, offset);
+}
+
+void vm_set_value(vmFrame *f, ssaValue *v, vmValue val) {
+	map_set(&f->values, hash_pointer(v), val);
+}
+
+
+
+vmFrame *vm_push_frame(VirtualMachine *vm, ssaProcedure *proc) {
+	vmFrame frame = {};
+
+	frame.vm          = vm;
+	frame.curr_proc   = proc;
+	frame.curr_block  = proc->blocks[0];
+	frame.instr_index = 0;
+	frame.caller      = vm_back_frame(vm);
+	frame.stack_allocator   = vm->stack_allocator;
+	frame.temp_arena_memory = gb_temp_arena_memory_begin(&vm->stack_arena);
+
+	map_init(&frame.values, vm->heap_allocator);
+	array_init(&frame.locals, vm->heap_allocator, proc->local_count);
+	array_add(&vm->frame_stack, frame);
+	return vm_back_frame(vm);
+}
+
+void vm_pop_frame(VirtualMachine *vm) {
+	vmFrame *f = vm_back_frame(vm);
+
+	gb_temp_arena_memory_end(f->temp_arena_memory);
+	array_free(&f->locals);
+	map_destroy(&f->values);
+
+	array_pop(&vm->frame_stack);
+
+}
+
+vmValue vm_call_procedure(VirtualMachine *vm, ssaProcedure *proc, Array<vmValue> values) {
+	GB_ASSERT_MSG(proc->params.count == values.count,
+	              "Incorrect number of arguments passed into procedure call!");
+
+
+	vmValue result = {};
+
+	if (proc->body == NULL) {
+		GB_PANIC("TODO(bill): external procedure");
+		return result;
+	}
+	gb_printf("call: %.*s\n", LIT(proc->name));
+
+	vmFrame *f = vm_push_frame(vm, proc);
+	for_array(i, proc->params) {
+		vm_set_value(f, proc->params[i], values[i]);
+	}
+
+	while (f->curr_block != NULL) {
+		ssaValue *curr_instr = f->curr_block->instrs[f->instr_index++];
+		vm_exec_instr(vm, curr_instr);
+	}
+
+	if (base_type(proc->type)->Proc.result_count > 0) {
+		result = f->result;
+	}
+	vm_pop_frame(vm);
+	return result;
+}
+
+
+vmValue vm_operand_value(VirtualMachine *vm, ssaValue *value) {
+	vmFrame *f = vm_back_frame(vm);
+	vmValue v = {};
+	switch (value->kind) {
+	case ssaValue_Constant: {
+		auto *c = &value->Constant;
+		Type *t = base_type(c->type);
+		// i64 size = vm_type_size_of(vm, t);
+		if (is_type_boolean(t)) {
+			v.val_int = c->value.value_bool != 0;
+		} else if (is_type_integer(t)) {
+			v.val_int = c->value.value_integer;
+		} else if (is_type_float(t)) {
+			if (t->Basic.kind == Basic_f32) {
+				v.val_f32 = cast(f32)c->value.value_float;
+			} else if (t->Basic.kind == Basic_f64) {
+				v.val_f64 = cast(f64)c->value.value_float;
+			}
+		} else if (is_type_pointer(t)) {
+			v.val_ptr = cast(void *)cast(intptr)c->value.value_pointer;
+		} else if (is_type_string(t)) {
+			array_init(&v.val_comp, vm->heap_allocator, 2);
+
+			String str = c->value.value_string;
+			i64 len = str.len;
+			u8 *text = gb_alloc_array(vm->heap_allocator, u8, len);
+			gb_memcopy(text, str.text, len);
+
+			vmValue data = {};
+			vmValue count = {};
+			data.val_ptr = text;
+			count.val_int = len;
+			array_add(&v.val_comp, data);
+			array_add(&v.val_comp, count);
+		} else {
+			GB_PANIC("TODO(bill): Other constant types: %s", type_to_string(c->type));
+		}
+	} break;
+	case ssaValue_ConstantSlice: {
+		array_init(&v.val_comp, vm->heap_allocator, 3);
+
+		auto *cs = &value->ConstantSlice;
+		vmValue data = {};
+		vmValue count = {};
+		data = vm_operand_value(vm, cs->backing_array);
+		count.val_int = cs->count;
+		array_add(&v.val_comp, data);
+		array_add(&v.val_comp, count);
+		array_add(&v.val_comp, count);
+	} break;
+	case ssaValue_Nil:
+		GB_PANIC("TODO(bill): ssaValue_Nil");
+		break;
+	case ssaValue_TypeName:
+		GB_PANIC("TODO(bill): ssaValue_TypeName");
+		break;
+	case ssaValue_Global:
+		v = *map_get(&vm->globals, hash_pointer(value));
+		break;
+	case ssaValue_Param:
+		v = *map_get(&f->values, hash_pointer(value));
+		break;
+	case ssaValue_Proc: {
+		v.val_proc.proc = &value->Proc;
+		// GB_PANIC("TODO(bill): ssaValue_Proc");
+	} break;
+	case ssaValue_Block:
+		GB_PANIC("TODO(bill): ssaValue_Block");
+		break;
+	case ssaValue_Instr: {
+		vmValue *found = map_get(&f->values, hash_pointer(value));
+		if (found) {
+			v = *found;
+		}
+	} break;
+	}
+
+	return v;
+}
+
+void vm_store_integer(VirtualMachine *vm, vmValue *dst, vmValue val, i64 store_bytes) {
+	// TODO(bill): I assume little endian here
+	GB_ASSERT(dst != NULL);
+	gb_memcopy(&dst->val_int, &val.val_int, store_bytes);
+
+}
+
+void vm_store(VirtualMachine *vm, vmValue *dst, vmValue val, Type *type) {
+	i64 size = vm_type_size_of(vm, type);
+	type = base_type(type);
+
+	// TODO(bill): I assume little endian here
+
+	switch (type->kind) {
+	case Type_Basic:
+		switch (type->Basic.kind) {
+		case Basic_bool:
+		case Basic_i8:
+		case Basic_u8:
+		case Basic_i16:
+		case Basic_u16:
+		case Basic_i32:
+		case Basic_u32:
+		case Basic_i64:
+		case Basic_u64:
+		case Basic_int:
+		case Basic_uint:
+			vm_store_integer(vm, dst, val, size);
+			break;
+		case Basic_f32:
+			dst->val_f32 = val.val_f32;
+			break;
+		case Basic_f64:
+			dst->val_f64 = val.val_f64;
+			break;
+		case Basic_rawptr:
+			dst->val_ptr = val.val_ptr;
+			break;
+		default:
+			GB_PANIC("TODO(bill): other basic types for `vm_store`");
+			break;
+		}
+		break;
+
+	default:
+		GB_PANIC("TODO(bill): other types for `vm_store`");
+		break;
+	}
+}
+
+vmValue vm_load_integer(VirtualMachine *vm, vmValue *ptr, i64 store_bytes) {
+	// TODO(bill): I assume little endian here
+	vmValue v = {};
+	// NOTE(bill): Only load the needed amount
+	gb_memcopy(&v.val_int, ptr->val_ptr, store_bytes);
+	return v;
+}
+
+vmValue vm_load(VirtualMachine *vm, vmValue *ptr, Type *type) {
+	i64 size = vm_type_size_of(vm, type);
+	type = base_type(type);
+
+	vmValue v = {};
+
+	switch (type->kind) {
+	case Type_Basic:
+		switch (type->Basic.kind) {
+		case Basic_bool:
+		case Basic_i8:
+		case Basic_u8:
+		case Basic_i16:
+		case Basic_u16:
+		case Basic_i32:
+		case Basic_u32:
+		case Basic_i64:
+		case Basic_u64:
+		case Basic_int:
+		case Basic_uint:
+			v = vm_load_integer(vm, ptr, size);
+			break;
+		case Basic_f32:
+			v.val_f32 = *cast(f32 *)ptr;
+			break;
+		case Basic_f64:
+			v.val_f64 = *cast(f64 *)ptr;
+			break;
+		case Basic_rawptr:
+			v.val_ptr = *cast(void **)ptr;
+			break;
+		default:
+			GB_PANIC("TODO(bill): other basic types for `vm_load`");
+			break;
+		}
+		break;
+
+	default:
+		GB_PANIC("TODO(bill): other types for `vm_load`");
+		break;
+	}
+
+	return v;
+}
+
+
+void vm_exec_instr(VirtualMachine *vm, ssaValue *value) {
+	GB_ASSERT(value->kind == ssaValue_Instr);
+	ssaInstr *instr = &value->Instr;
+	vmFrame *f = vm_back_frame(vm);
+
+#if 0
+	if (instr->kind != ssaInstr_Comment) {
+		gb_printf("exec_instr: %.*s\n", LIT(ssa_instr_strings[instr->kind]));
+	}
+#endif
+
+	switch (instr->kind) {
+	case ssaInstr_StartupRuntime: {
+#if 0
+		ssaValue *v = ssa_lookup_member(vm->module, make_string(SSA_STARTUP_RUNTIME_PROC_NAME));
+		GB_ASSERT(v->kind == ssaValue_Proc);
+		ssaProcedure *proc = &v->Proc;
+		Array<vmValue> args = {}; // Empty
+		vm_call_procedure(vm, proc, args); // NOTE(bill): No return value
+#endif
+	} break;
+
+	case ssaInstr_Comment:
+		break;
+
+	case ssaInstr_Local: {
+		Type *type = ssa_type(value);
+		isize size  = gb_max(1, vm_type_size_of(vm, type));
+		isize align = gb_max(1, vm_type_align_of(vm, type));
+		void *memory = gb_alloc_align(vm->stack_allocator, size, align);
+		GB_ASSERT(memory != NULL);
+		vmValue v = vm_make_value_ptr(memory);
+		vm_set_value(f, value, v);
+		array_add(&f->locals, memory);
+	} break;
+
+	case ssaInstr_ZeroInit: {
+
+	} break;
+
+	case ssaInstr_Store: {
+		vmValue addr = vm_operand_value(vm, instr->Store.address);
+		vmValue val = vm_operand_value(vm, instr->Store.value);
+		vmValue *address = cast(vmValue *)addr.val_ptr;
+		Type *t = ssa_type(instr->Store.value);
+		vm_store(vm, address, val, t);
+	} break;
+
+	case ssaInstr_Load: {
+		vmValue addr = vm_operand_value(vm, instr->Load.address);
+		vmValue v = vm_load(vm, &addr, ssa_type(value));
+		vm_set_value(f, value, v);
+	} break;
+
+	case ssaInstr_ArrayElementPtr: {
+		vmValue address    = vm_operand_value(vm, instr->ArrayElementPtr.address);
+		vmValue elem_index = vm_operand_value(vm, instr->ArrayElementPtr.elem_index);
+
+		Type *t = ssa_type(instr->ArrayElementPtr.address);
+		i64 elem_size = vm_type_size_of(vm, type_deref(t));
+		void *ptr = cast(u8 *)address.val_ptr + elem_index.val_int*elem_size;
+		vm_set_value(f, value, vm_make_value_ptr(ptr));
+	} break;
+
+	case ssaInstr_StructElementPtr: {
+		vmValue address    = vm_operand_value(vm, instr->StructElementPtr.address);
+		i32 elem_index = instr->StructElementPtr.elem_index;
+
+		Type *t = ssa_type(instr->StructElementPtr.address);
+		i64 offset_in_bytes = vm_type_offset_of(vm, type_deref(t), elem_index);
+		void *ptr = cast(u8 *)address.val_ptr + offset_in_bytes;
+		vm_set_value(f, value, vm_make_value_ptr(ptr));
+	} break;
+
+	case ssaInstr_PtrOffset: {
+		Type *t = ssa_type(instr->PtrOffset.address);
+		i64 elem_size = vm_type_size_of(vm, type_deref(t));
+		vmValue address = vm_operand_value(vm, instr->PtrOffset.address);
+		vmValue offset  = vm_operand_value(vm, instr->PtrOffset.offset);
+
+		void *ptr = cast(u8 *)address.val_ptr + offset.val_int*elem_size;
+		vm_set_value(f, value, vm_make_value_ptr(ptr));
+	} break;
+
+	case ssaInstr_Phi: {
+
+	} break;
+
+	case ssaInstr_ArrayExtractValue: {
+		vmValue s = vm_operand_value(vm, instr->ArrayExtractValue.address);
+		vmValue v = s.val_comp[instr->ArrayExtractValue.index];
+		vm_set_value(f, value, v);
+	} break;
+
+	case ssaInstr_StructExtractValue: {
+		vmValue s = vm_operand_value(vm, instr->StructExtractValue.address);
+		vmValue v = s.val_comp[instr->StructExtractValue.index];
+		vm_set_value(f, value, v);
+	} break;
+
+	case ssaInstr_Jump: {
+		f->curr_block = instr->Jump.block;
+		f->instr_index = 0;
+	} break;
+
+	case ssaInstr_If: {;
+		vmValue cond = vm_operand_value(vm, instr->If.cond);
+		if (cond.val_int != 0) {
+			f->curr_block = instr->If.true_block;
+		} else {
+			f->curr_block = instr->If.false_block;
+		}
+		f->instr_index = 0;
+	} break;
+
+	case ssaInstr_Return: {
+		Type *return_type = NULL;
+		vmValue result = {};
+
+		if (instr->Return.value != NULL) {
+			return_type = ssa_type(instr->Return.value);
+			result = vm_operand_value(vm, instr->Return.value);
+		}
+
+		f->result = result;
+		f->curr_block = NULL;
+		return;
+	} break;
+
+	case ssaInstr_Conv: {
+
+	} break;
+
+	case ssaInstr_Unreachable: {
+		GB_PANIC("Unreachable");
+	} break;
+
+	case ssaInstr_BinaryOp: {
+		auto *bo = &instr->BinaryOp;
+		Type *t = base_type(ssa_type(bo->left));
+		Type *et = t;
+		while (et->kind == Type_Vector) {
+			et = base_type(et->Vector.elem);
+		}
+
+		if (gb_is_between(bo->op, Token__ComparisonBegin+1, Token__ComparisonEnd-1)) {
+			GB_PANIC("TODO(bill): Comparison operations");
+		} else {
+			vmValue v = {};
+			vmValue l = vm_operand_value(vm, bo->left);
+			vmValue r = vm_operand_value(vm, bo->right);
+
+			if (is_type_integer(t)) {
+				switch (bo->op) {
+				case Token_Add: v.val_int = l.val_int + r.val_int; break;
+				case Token_Sub: v.val_int = l.val_int - r.val_int; break;
+				case Token_And: v.val_int = l.val_int & r.val_int; break;
+				case Token_Or:  v.val_int = l.val_int | r.val_int; break;
+				case Token_Xor: v.val_int = l.val_int ^ r.val_int; break;
+				case Token_Shl: v.val_int = l.val_int << r.val_int; break;
+				case Token_Shr: v.val_int = l.val_int >> r.val_int; break;
+				case Token_Mul: v.val_int = l.val_int * r.val_int; break;
+				case Token_Not: v.val_int = l.val_int ^ r.val_int; break;
+
+				case Token_AndNot: v.val_int = l.val_int & (~r.val_int); break;
+
+				case Token_Quo: GB_PANIC("TODO(bill): BinaryOp Integer Token_Quo"); break;
+				case Token_Mod: GB_PANIC("TODO(bill): BinaryOp Integer Token_Mod"); break;
+
+				}
+			} else if (is_type_float(t)) {
+				GB_PANIC("TODO(bill): Float BinaryOp");
+			} else {
+				GB_PANIC("TODO(bill): Vector BinaryOp");
+			}
+
+			vm_set_value(f, value, v);
+		}
+	} break;
+
+	case ssaInstr_Call: {
+		Array<vmValue> args = {};
+		array_init(&args, f->stack_allocator, instr->Call.arg_count);
+		for (isize i = 0; i < instr->Call.arg_count; i++) {
+			array_add(&args, vm_operand_value(vm, instr->Call.args[i]));
+		}
+		vmValue proc = vm_operand_value(vm, instr->Call.value);
+		if (proc.val_proc.proc != NULL) {
+			vmValue result = vm_call_procedure(vm, proc.val_proc.proc, args);
+			vm_set_value(f, value, result);
+		} else {
+			GB_PANIC("TODO(bill): external procedure calls");
+		}
+
+	} break;
+
+	case ssaInstr_Select: {
+		vmValue v = {};
+		vmValue cond = vm_operand_value(vm, instr->Select.cond);
+		if (cond.val_int != 0) {
+			v = vm_operand_value(vm, instr->Select.true_value);
+		} else {
+			v = vm_operand_value(vm, instr->Select.false_value);
+		}
+
+		vm_set_value(f, value, v);
+	} break;
+
+	case ssaInstr_VectorExtractElement: {
+
+	} break;
+
+	case ssaInstr_VectorInsertElement: {
+
+	} break;
+
+	case ssaInstr_VectorShuffle: {
+
+	} break;
+
+	case ssaInstr_BoundsCheck: {
+
+	} break;
+
+	case ssaInstr_SliceBoundsCheck: {
+
+	} break;
+
+
+	default: {
+		GB_PANIC("<unknown instr> %d\n", instr->kind);
+	} break;
+	}
+}