def generate(self, funcname, field_args, const_args, kernel_ast, c_include): ccode = [] pname = self.ptype.name + 'p' # ==== Add include for Parcels and math header ==== # ccode += [str(c.Include("parcels.h", system=False))] ccode += [str(c.Include("math.h", system=False))] ccode += [str(c.Assign('double _next_dt', '0'))] ccode += [str(c.Assign('size_t _next_dt_set', '0'))] ccode += [str(c.Assign('const int ngrid', str(self.fieldset.gridset.size if self.fieldset is not None else 1)))] # ==== Generate type definition for particle type ==== # vdeclp = [c.Pointer(c.POD(v.dtype, v.name)) for v in self.ptype.variables] ccode += [str(c.Typedef(c.GenerableStruct("", vdeclp, declname=pname)))] # Generate type definition for single particle type vdecl = [c.POD(v.dtype, v.name) for v in self.ptype.variables if v.dtype != np.uint64] ccode += [str(c.Typedef(c.GenerableStruct("", vdecl, declname=self.ptype.name)))] args = [c.Pointer(c.Value(self.ptype.name, "particle_backup")), c.Pointer(c.Value(pname, "particles")), c.Value("int", "pnum")] p_back_set_decl = c.FunctionDeclaration(c.Static(c.DeclSpecifier(c.Value("void", "set_particle_backup"), spec='inline')), args) body = [] for v in self.ptype.variables: if v.dtype != np.uint64 and v.name not in ['dt', 'state']: body += [c.Assign(("particle_backup->%s" % v.name), ("particles->%s[pnum]" % v.name))] p_back_set_body = c.Block(body) p_back_set = str(c.FunctionBody(p_back_set_decl, p_back_set_body)) ccode += [p_back_set] args = [c.Pointer(c.Value(self.ptype.name, "particle_backup")), c.Pointer(c.Value(pname, "particles")), c.Value("int", "pnum")] p_back_get_decl = c.FunctionDeclaration(c.Static(c.DeclSpecifier(c.Value("void", "get_particle_backup"), spec='inline')), args) body = [] for v in self.ptype.variables: if v.dtype != np.uint64 and v.name not in ['dt', 'state']: body += [c.Assign(("particles->%s[pnum]" % v.name), ("particle_backup->%s" % v.name))] p_back_get_body = c.Block(body) p_back_get = str(c.FunctionBody(p_back_get_decl, p_back_get_body)) ccode += [p_back_get] update_next_dt_decl = c.FunctionDeclaration(c.Static(c.DeclSpecifier(c.Value("void", "update_next_dt"), spec='inline')), [c.Value('double', 'dt')]) if 'update_next_dt' in str(kernel_ast): body = [] body += [c.Assign("_next_dt", "dt")] body += [c.Assign("_next_dt_set", "1")] update_next_dt_body = c.Block(body) update_next_dt = str(c.FunctionBody(update_next_dt_decl, update_next_dt_body)) ccode += [update_next_dt] if c_include: ccode += [c_include] # ==== Insert kernel code ==== # ccode += [str(kernel_ast)] # Generate outer loop for repeated kernel invocation args = [c.Value("int", "num_particles"), c.Pointer(c.Value(pname, "particles")), c.Value("double", "endtime"), c.Value("double", "dt")] for field, _ in field_args.items(): args += [c.Pointer(c.Value("CField", "%s" % field))] for const, _ in const_args.items(): args += [c.Value("double", const)] fargs_str = ", ".join(['particles->time[pnum]'] + list(field_args.keys()) + list(const_args.keys())) # ==== statement clusters use to compose 'body' variable and variables 'time_loop' and 'part_loop' ==== ## sign_dt = c.Assign("sign_dt", "dt > 0 ? 1 : -1") particle_backup = c.Statement("%s particle_backup" % self.ptype.name) sign_end_part = c.Assign("sign_end_part", "(endtime - particles->time[pnum]) > 0 ? 1 : -1") reset_res_state = c.Assign("res", "particles->state[pnum]") update_state = c.Assign("particles->state[pnum]", "res") update_pdt = c.If("_next_dt_set == 1", c.Block([c.Assign("_next_dt_set", "0"), c.Assign("particles->dt[pnum]", "_next_dt")])) dt_pos = c.Assign("__dt", "fmin(fabs(particles->dt[pnum]), fabs(endtime - particles->time[pnum]))") # original pdt_eq_dt_pos = c.Assign("__pdt_prekernels", "__dt * sign_dt") partdt = c.Assign("particles->dt[pnum]", "__pdt_prekernels") check_pdt = c.If("(res == SUCCESS) & !is_equal_dbl(__pdt_prekernels, particles->dt[pnum])", c.Assign("res", "REPEAT")) dt_0_break = c.If("is_zero_dbl(particles->dt[pnum])", c.Statement("break")) notstarted_continue = c.If("(( sign_end_part != sign_dt) || is_close_dbl(__dt, 0) ) && !is_zero_dbl(particles->dt[pnum])", c.Block([ c.If("fabs(particles->time[pnum]) >= fabs(endtime)", c.Assign("particles->state[pnum]", "SUCCESS")), c.Statement("continue") ])) # ==== main computation body ==== # body = [c.Statement("set_particle_backup(&particle_backup, particles, pnum)")] body += [pdt_eq_dt_pos] body += [partdt] body += [c.Value("StatusCode", "state_prev"), c.Assign("state_prev", "particles->state[pnum]")] body += [c.Assign("res", "%s(particles, pnum, %s)" % (funcname, fargs_str))] body += [c.If("(res==SUCCESS) && (particles->state[pnum] != state_prev)", c.Assign("res", "particles->state[pnum]"))] body += [check_pdt] body += [c.If("res == SUCCESS || res == DELETE", c.Block([c.Statement("particles->time[pnum] += particles->dt[pnum]"), update_pdt, dt_pos, sign_end_part, c.If("(res != DELETE) && !is_close_dbl(__dt, 0) && (sign_dt == sign_end_part)", c.Assign("res", "EVALUATE")), c.If("sign_dt != sign_end_part", c.Assign("__dt", "0")), update_state, dt_0_break ]), c.Block([c.Statement("get_particle_backup(&particle_backup, particles, pnum)"), dt_pos, sign_end_part, c.If("sign_dt != sign_end_part", c.Assign("__dt", "0")), update_state, c.Statement("break")]) )] time_loop = c.While("(particles->state[pnum] == EVALUATE || particles->state[pnum] == REPEAT) || is_zero_dbl(particles->dt[pnum])", c.Block(body)) part_loop = c.For("pnum = 0", "pnum < num_particles", "++pnum", c.Block([sign_end_part, reset_res_state, dt_pos, notstarted_continue, time_loop])) fbody = c.Block([c.Value("int", "pnum, sign_dt, sign_end_part"), c.Value("StatusCode", "res"), c.Value("double", "__pdt_prekernels"), c.Value("double", "__dt"), # 1e-8 = built-in tolerance for np.isclose() sign_dt, particle_backup, part_loop]) fdecl = c.FunctionDeclaration(c.Value("void", "particle_loop"), args) ccode += [str(c.FunctionBody(fdecl, fbody))] return "\n\n".join(ccode)
def generate(self, funcname, field_args, const_args, kernel_ast, c_include): ccode = [] # Add include for Parcels and math header ccode += [str(c.Include("parcels.h", system=False))] ccode += [str(c.Include("math.h", system=False))] # Generate type definition for particle type vdecl = [] for v in self.ptype.variables: if v.dtype == np.uint64: vdecl.append(c.Pointer(c.POD(np.void, v.name))) else: vdecl.append(c.POD(v.dtype, v.name)) ccode += [ str( c.Typedef( c.GenerableStruct("", vdecl, declname=self.ptype.name))) ] args = [ c.Pointer(c.Value(self.ptype.name, "particle_backup")), c.Pointer(c.Value(self.ptype.name, "particle")) ] p_back_set_decl = c.FunctionDeclaration( c.Static( c.DeclSpecifier(c.Value("void", "set_particle_backup"), spec='inline')), args) body = [] for v in self.ptype.variables: if v.dtype != np.uint64 and v.name not in ['dt', 'state']: body += [ c.Assign(("particle_backup->%s" % v.name), ("particle->%s" % v.name)) ] p_back_set_body = c.Block(body) p_back_set = str(c.FunctionBody(p_back_set_decl, p_back_set_body)) ccode += [p_back_set] args = [ c.Pointer(c.Value(self.ptype.name, "particle_backup")), c.Pointer(c.Value(self.ptype.name, "particle")) ] p_back_get_decl = c.FunctionDeclaration( c.Static( c.DeclSpecifier(c.Value("void", "get_particle_backup"), spec='inline')), args) body = [] for v in self.ptype.variables: if v.dtype != np.uint64 and v.name not in ['dt', 'state']: body += [ c.Assign(("particle->%s" % v.name), ("particle_backup->%s" % v.name)) ] p_back_get_body = c.Block(body) p_back_get = str(c.FunctionBody(p_back_get_decl, p_back_get_body)) ccode += [p_back_get] if c_include: ccode += [c_include] # Insert kernel code ccode += [str(kernel_ast)] # Generate outer loop for repeated kernel invocation args = [ c.Value("int", "num_particles"), c.Pointer(c.Value(self.ptype.name, "particles")), c.Value("double", "endtime"), c.Value("float", "dt") ] for field, _ in field_args.items(): args += [c.Pointer(c.Value("CField", "%s" % field))] for const, _ in const_args.items(): args += [c.Value("float", const)] fargs_str = ", ".join(['particles[p].time', 'sign_dt * __dt'] + list(field_args.keys()) + list(const_args.keys())) # Inner loop nest for forward runs sign_dt = c.Assign("sign_dt", "dt > 0 ? 1 : -1") particle_backup = c.Statement("%s particle_backup" % self.ptype.name) sign_end_part = c.Assign("sign_end_part", "endtime - particles[p].time > 0 ? 1 : -1") dt_pos = c.Assign( "__dt", "fmin(fabs(particles[p].dt), fabs(endtime - particles[p].time))") pdt_eq_dt_pos = c.Assign("particles[p].dt", "__dt * sign_dt") dt_0_break = c.If("particles[p].dt == 0", c.Statement("break")) notstarted_continue = c.If( "(sign_end_part != sign_dt) && (particles[p].dt != 0)", c.Statement("continue")) body = [ c.Statement( "set_particle_backup(&particle_backup, &(particles[p]))") ] body += [pdt_eq_dt_pos] body += [ c.Assign("res", "%s(&(particles[p]), %s)" % (funcname, fargs_str)) ] body += [c.Assign("particles[p].state", "res")] # Store return code on particle body += [ c.If( "res == SUCCESS", c.Block([ c.Statement("particles[p].time += sign_dt * __dt"), dt_pos, dt_0_break, c.Statement("continue") ])) ] body += [ c.If( "res == REPEAT", c.Block([ c.Statement( "get_particle_backup(&particle_backup, &(particles[p]))" ), dt_pos, c.Statement("break") ]), c.Statement("break")) ] time_loop = c.While("__dt > __tol || particles[p].dt == 0", c.Block(body)) part_loop = c.For( "p = 0", "p < num_particles", "++p", c.Block([sign_end_part, notstarted_continue, dt_pos, time_loop])) fbody = c.Block([ c.Value("int", "p, sign_dt, sign_end_part"), c.Value("ErrorCode", "res"), c.Value("double", "__dt, __tol"), c.Assign("__tol", "1.e-6"), sign_dt, particle_backup, part_loop ]) fdecl = c.FunctionDeclaration(c.Value("void", "particle_loop"), args) ccode += [str(c.FunctionBody(fdecl, fbody))] return "\n\n".join(ccode)