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)
