/
Binder.java
1132 lines (1063 loc) · 55.8 KB
/
Binder.java
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package org.perl6.rakudo;
import java.util.*;
import org.perl6.nqp.runtime.*;
import org.perl6.nqp.sixmodel.*;
import org.perl6.nqp.sixmodel.reprs.ContextRefInstance;
import org.perl6.nqp.sixmodel.reprs.P6int;
import org.perl6.nqp.sixmodel.reprs.P6str;
import org.perl6.nqp.sixmodel.reprs.P6num;
import org.perl6.nqp.sixmodel.reprs.P6OpaqueREPRData;
@SuppressWarnings("unused")
public final class Binder {
/* Possible results of binding. */
public static final int BIND_RESULT_OK = 0;
public static final int BIND_RESULT_FAIL = 1;
public static final int BIND_RESULT_JUNCTION = 2;
/* Compile time trial binding result indicators. */
public static final int TRIAL_BIND_NOT_SURE = 0; /* Plausible, but need to check at runtime. */
public static final int TRIAL_BIND_OK = 1; /* Bind will always work out. */
public static final int TRIAL_BIND_NO_WAY = -1; /* Bind could never work out. */
/* Flags. */
private static final int SIG_ELEM_BIND_CAPTURE = 1;
private static final int SIG_ELEM_BIND_PRIVATE_ATTR = 2;
private static final int SIG_ELEM_BIND_PUBLIC_ATTR = 4;
private static final int SIG_ELEM_BIND_ATTRIBUTIVE = (SIG_ELEM_BIND_PRIVATE_ATTR | SIG_ELEM_BIND_PUBLIC_ATTR);
private static final int SIG_ELEM_SLURPY_POS = 8;
private static final int SIG_ELEM_SLURPY_NAMED = 16;
private static final int SIG_ELEM_SLURPY_LOL = 32;
private static final int SIG_ELEM_INVOCANT = 64;
private static final int SIG_ELEM_MULTI_INVOCANT = 128;
private static final int SIG_ELEM_IS_RW = 256;
private static final int SIG_ELEM_IS_COPY = 512;
private static final int SIG_ELEM_IS_RAW = 1024;
private static final int SIG_ELEM_IS_OPTIONAL = 2048;
private static final int SIG_ELEM_ARRAY_SIGIL = 4096;
private static final int SIG_ELEM_HASH_SIGIL = 8192;
private static final int SIG_ELEM_DEFAULT_FROM_OUTER = 16384;
private static final int SIG_ELEM_IS_CAPTURE = 32768;
private static final int SIG_ELEM_UNDEFINED_ONLY = 65536;
private static final int SIG_ELEM_DEFINED_ONLY = 131072;
private static final int SIG_ELEM_DEFINEDNES_CHECK = (SIG_ELEM_UNDEFINED_ONLY | SIG_ELEM_DEFINED_ONLY);
private static final int SIG_ELEM_NOMINAL_GENERIC = 524288;
private static final int SIG_ELEM_DEFAULT_IS_LITERAL = 1048576;
private static final int SIG_ELEM_NATIVE_INT_VALUE = 2097152;
private static final int SIG_ELEM_NATIVE_NUM_VALUE = 4194304;
private static final int SIG_ELEM_NATIVE_STR_VALUE = 8388608;
private static final int SIG_ELEM_NATIVE_VALUE = (SIG_ELEM_NATIVE_INT_VALUE | SIG_ELEM_NATIVE_NUM_VALUE | SIG_ELEM_NATIVE_STR_VALUE);
private static final int SIG_ELEM_SLURPY_ONEARG = 16777216;
private static final int SIG_ELEM_SLURPY = (SIG_ELEM_SLURPY_POS | SIG_ELEM_SLURPY_NAMED | SIG_ELEM_SLURPY_LOL | SIG_ELEM_SLURPY_ONEARG);
/* Hints for Parameter attributes. */
private static final int HINT_variable_name = 0;
private static final int HINT_named_names = 1;
private static final int HINT_type_captures = 2;
private static final int HINT_flags = 3;
private static final int HINT_nominal_type = 4;
private static final int HINT_post_constraints = 5;
private static final int HINT_coerce_type = 6;
private static final int HINT_coerce_method = 7;
private static final int HINT_sub_signature = 8;
private static final int HINT_default_value = 9;
private static final int HINT_container_descriptor = 10;
private static final int HINT_attr_package = 11;
/* Other hints. */
private static final int HINT_ENUMMAP_storage = 0;
private static final int HINT_CAPTURE_list = 0;
private static final int HINT_CAPTURE_hash = 1;
private static final int HINT_LIST_reified = 0;
private static final int HINT_SIG_params = 0;
private static SixModelObject createBox(ThreadContext tc, RakOps.GlobalExt gcx, Object arg, int flag) {
switch (flag) {
case CallSiteDescriptor.ARG_INT:
return Ops.box_i((long)arg, gcx.Int, tc);
case CallSiteDescriptor.ARG_NUM:
return Ops.box_n((double)arg, gcx.Num, tc);
case CallSiteDescriptor.ARG_STR:
return Ops.box_s((String)arg, gcx.Str, tc);
default:
throw new RuntimeException("Impossible case reached in createBox");
}
}
private static String arityFail(ThreadContext tc, RakOps.GlobalExt gcx, SixModelObject params,
int numParams, int numPosArgs, boolean tooMany) {
int arity = 0;
int count = 0;
String fail = tooMany ? "Too many" : "Too few";
/* Work out how many we could have been passed. */
for (int i = 0; i < numParams; i++) {
SixModelObject param = params.at_pos_boxed(tc, i);
param.get_attribute_native(tc, gcx.Parameter, "$!flags", HINT_flags);
int flags = (int)tc.native_i;
SixModelObject namedNames = param.get_attribute_boxed(tc,
gcx.Parameter, "@!named_names", HINT_named_names);
if (namedNames != null)
continue;
if ((flags & SIG_ELEM_SLURPY_NAMED) != 0)
continue;
if ((flags & SIG_ELEM_SLURPY) != 0) {
count = -1000; // cargo-culted from BOOTSTRAP.nqp: "in case a pos can sneak past a slurpy somehow"
}
else if ((flags & SIG_ELEM_IS_OPTIONAL) != 0) {
count++;
}
else {
count++;
arity++;
}
}
/* Now generate decent error. */
if (arity == count)
return String.format(
"%s positionals passed; expected %d arguments but got %d",
fail, arity, numPosArgs);
else if (count <= -1)
return String.format(
"%s positionals passed; expected at least %d arguments but got only %d",
fail, arity, numPosArgs);
else
return String.format(
"%s positionals passed; expected %d %s %d arguments but got %d",
fail, arity, arity + 1 == count ? "or" : "to" , count, numPosArgs);
}
/* Binds any type captures. */
public static void bindTypeCaptures(ThreadContext tc, SixModelObject typeCaps, CallFrame cf, SixModelObject type) {
long elems = typeCaps.elems(tc);
StaticCodeInfo sci = cf.codeRef.staticInfo;
for (long i = 0; i < elems; i++) {
typeCaps.at_pos_native(tc, i);
String name = tc.native_s;
cf.oLex[sci.oTryGetLexicalIdx(name)] = type;
}
}
/* Assigns an attributive parameter to the desired attribute. */
private static int assignAttributive(ThreadContext tc, CallFrame cf, String varName,
int paramFlags, SixModelObject attrPackage, SixModelObject value, Object[] error) {
/* Find self. */
StaticCodeInfo sci = cf.codeRef.staticInfo;
Integer selfIdx = sci.oTryGetLexicalIdx("self");
SixModelObject self = null;
if (selfIdx == null) {
self = Ops.getlexouter("self", tc);
if (self == null) {
if (error != null)
error[0] = String.format(
"Unable to bind attributive parameter '%s' - could not find self",
varName);
return BIND_RESULT_FAIL;
}
}
else {
self = cf.oLex[selfIdx];
}
/* If it's private, just need to fetch the attribute. */
SixModelObject assignee;
if ((paramFlags & SIG_ELEM_BIND_PRIVATE_ATTR) != 0) {
/* If we have a native Attribute we can't get a container for it, and
since *trying* to get a container would throw already, we first check
if the target Attribute is native. */
int hint = -1;
for (HashMap<String, Integer> map : ((P6OpaqueREPRData) (attrPackage.st.REPRData)).nameToHintMap) {
try {
hint = map.get(varName);
}
catch (Exception e) {
continue;
}
}
REPR attrREPR = null;
if (((P6OpaqueREPRData) (attrPackage.st.REPRData)).flattenedSTables[hint] != null) {
/* We sometimes don't have flattenedSTables. I'm not sure that's okay, honestly... */
attrREPR = ((P6OpaqueREPRData) (attrPackage.st.REPRData)).flattenedSTables[hint].REPR;
}
if (attrREPR instanceof P6int) {
Ops.bindattr_i(self, attrPackage, varName, Ops.unbox_i(value, tc), tc);
}
else if (attrREPR instanceof P6num) {
Ops.bindattr_n(self, attrPackage, varName, Ops.unbox_n(value, tc), tc);
}
else if (attrREPR instanceof P6str) {
Ops.bindattr_s(self, attrPackage, varName, Ops.unbox_s(value, tc), tc);
}
else {
/* ...but we'll just assume it's probably some boxed Attribute. */
assignee = self.get_attribute_boxed(tc, attrPackage, varName, STable.NO_HINT);
RakOps.p6store(assignee, value, tc);
}
}
/* Otherwise if it's public, do a method call to get the assignee. */
else {
throw new RuntimeException("$.x parameters NYI");
}
return BIND_RESULT_OK;
}
/* Returns an appropriate failure mode (junction fail or normal fail). */
private static int juncOrFail(ThreadContext tc, RakOps.GlobalExt gcx, SixModelObject value) {
if (value.st.WHAT == gcx.Junction && Ops.isconcrete(value, tc) != 0)
return BIND_RESULT_JUNCTION;
else
return BIND_RESULT_FAIL;
}
/* Binds a single argument into the lexpad, after doing any checks that are
* needed. Also handles any type captures. If there is a sub signature, then
* re-enters the binder. Returns one of the BIND_RESULT_* codes. */
private static final CallSiteDescriptor genIns = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_OBJ }, null);
private static final CallSiteDescriptor ACCEPTS_o = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_OBJ }, null);
private static final CallSiteDescriptor ACCEPTS_i = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_INT }, null);
private static final CallSiteDescriptor ACCEPTS_n = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_NUM }, null);
private static final CallSiteDescriptor ACCEPTS_s = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_STR }, null);
private static final CallSiteDescriptor bindParamThrower = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_OBJ,
CallSiteDescriptor.ARG_STR, CallSiteDescriptor.ARG_OBJ,
CallSiteDescriptor.ARG_INT
}, null);
private static final CallSiteDescriptor bindConcreteThrower = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_STR, CallSiteDescriptor.ARG_STR,
CallSiteDescriptor.ARG_STR, CallSiteDescriptor.ARG_STR,
CallSiteDescriptor.ARG_INT, CallSiteDescriptor.ARG_INT
}, null);
private static final CallSiteDescriptor paramReadWriteThrower = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_STR }, null);
private static int bindOneParam(ThreadContext tc, RakOps.GlobalExt gcx, CallFrame cf, SixModelObject param,
Object origArg, byte origFlag, boolean noNomTypeCheck, boolean isSlurpyNamed, Object[] error) {
/* Get parameter flags and variable name. */
param.get_attribute_native(tc, gcx.Parameter, "$!flags", HINT_flags);
int paramFlags = (int)tc.native_i;
param.get_attribute_native(tc, gcx.Parameter, "$!variable_name", HINT_variable_name);
String varName = tc.native_s;
boolean hasVarName = true;
if (varName == null || varName.isEmpty()) {
varName = "<anon>";
hasVarName = false;
}
if (RakOps.DEBUG_MODE)
System.err.println(varName);
/* We'll put the value to bind into one of the following locals, and
* flag will indicate what type of thing it is. */
int flag;
long arg_i = 0;
double arg_n = 0.0;
String arg_s = null;
SixModelObject arg_o = null;
/* Check if boxed/unboxed expectations are met. */
int desiredNative = paramFlags & SIG_ELEM_NATIVE_VALUE;
boolean is_rw = (paramFlags & SIG_ELEM_IS_RW) != 0;
int gotNative = origFlag & (CallSiteDescriptor.ARG_INT | CallSiteDescriptor.ARG_NUM | CallSiteDescriptor.ARG_STR);
if (is_rw && desiredNative != 0) {
switch (desiredNative) {
case SIG_ELEM_NATIVE_INT_VALUE:
if (gotNative != 0 || Ops.iscont_i((SixModelObject)origArg) == 0) {
if (error != null)
error[0] = String.format(
"Expected a modifiable native int argument for '%s'",
varName);
return BIND_RESULT_FAIL;
}
break;
case SIG_ELEM_NATIVE_NUM_VALUE:
if (gotNative != 0 || Ops.iscont_n((SixModelObject)origArg) == 0) {
if (error != null)
error[0] = String.format(
"Expected a modifiable native num argument for '%s'",
varName);
return BIND_RESULT_FAIL;
}
break;
case SIG_ELEM_NATIVE_STR_VALUE:
if (gotNative != 0 || Ops.iscont_s((SixModelObject)origArg) == 0) {
if (error != null)
error[0] = String.format(
"Expected a modifiable native str argument for '%s'",
varName);
return BIND_RESULT_FAIL;
}
break;
}
flag = CallSiteDescriptor.ARG_OBJ;
arg_o = (SixModelObject)origArg;
}
else if (desiredNative == 0 && gotNative == CallSiteDescriptor.ARG_OBJ) {
flag = gotNative;
arg_o = (SixModelObject)origArg;
}
else if (desiredNative == SIG_ELEM_NATIVE_INT_VALUE && gotNative == CallSiteDescriptor.ARG_INT) {
flag = gotNative;
arg_i = (long)origArg;
}
else if (desiredNative == SIG_ELEM_NATIVE_NUM_VALUE && gotNative == CallSiteDescriptor.ARG_NUM) {
flag = gotNative;
arg_n = (double)origArg;
}
else if (desiredNative == SIG_ELEM_NATIVE_STR_VALUE && gotNative == CallSiteDescriptor.ARG_STR) {
flag = gotNative;
arg_s = (String)origArg;
}
else if (desiredNative == 0) {
/* We need to do a boxing operation. */
flag = CallSiteDescriptor.ARG_OBJ;
arg_o = createBox(tc, gcx, origArg, gotNative);
}
else {
/* We need to do an unboxing opeation. */
SixModelObject decontValue = Ops.decont((SixModelObject)origArg, tc);
StorageSpec spec = decontValue.st.REPR.get_storage_spec(tc, decontValue.st);
switch (desiredNative) {
case SIG_ELEM_NATIVE_INT_VALUE:
if ((spec.can_box & StorageSpec.CAN_BOX_INT) != 0) {
flag = CallSiteDescriptor.ARG_INT;
arg_i = decontValue.get_int(tc);
}
else {
if (error != null)
error[0] = String.format(
"Cannot unbox argument to '%s' as a native int",
varName);
return BIND_RESULT_FAIL;
}
break;
case SIG_ELEM_NATIVE_NUM_VALUE:
if ((spec.can_box & StorageSpec.CAN_BOX_NUM) != 0) {
flag = CallSiteDescriptor.ARG_NUM;
arg_n = decontValue.get_num(tc);
}
else {
if (error != null)
error[0] = String.format(
"Cannot unbox argument to '%s' as a native num",
varName);
return BIND_RESULT_FAIL;
}
break;
case SIG_ELEM_NATIVE_STR_VALUE:
if ((spec.can_box & StorageSpec.CAN_BOX_STR) != 0) {
flag = CallSiteDescriptor.ARG_STR;
arg_s = decontValue.get_str(tc);
}
else {
if (error != null)
error[0] = String.format(
"Cannot unbox argument to '%s' as a native str",
varName);
return BIND_RESULT_FAIL;
}
break;
default:
if (error != null)
error[0] = String.format(
"Cannot unbox argument to '%s' as a native type",
varName);
return BIND_RESULT_FAIL;
}
}
/* By this point, we'll either have an object that we might be able to
* bind if it passes the type check, or a native value that needs no
* further checking. */
SixModelObject decontValue = null;
boolean didHLLTransform = false;
SixModelObject nomType = null;
SixModelObject ContextRef = null;
SixModelObject HOW = null;
if (flag == CallSiteDescriptor.ARG_OBJ && !(is_rw && desiredNative != 0)) {
/* We need to work on the decontainerized value. */
decontValue = Ops.decont(arg_o, tc);
/* HLL map it as needed. */
SixModelObject beforeHLLize = decontValue;
decontValue = Ops.hllize(decontValue, tc);
if (decontValue != beforeHLLize)
didHLLTransform = true;
/* Skip nominal type check if not needed. */
if (!noNomTypeCheck) {
/* Is the nominal type generic and in need of instantiation? (This
* can happen in (::T, T) where we didn't learn about the type until
* during the signature bind). */
nomType = param.get_attribute_boxed(tc, gcx.Parameter,
"$!nominal_type", HINT_nominal_type);
if ((paramFlags & SIG_ELEM_NOMINAL_GENERIC) != 0) {
HOW = nomType.st.HOW;
SixModelObject ig = Ops.findmethod(HOW,
"instantiate_generic", tc);
ContextRef = tc.gc.ContextRef;
SixModelObject cc = ContextRef.st.REPR.allocate(tc, ContextRef.st);
((ContextRefInstance)cc).context = cf;
Ops.invokeDirect(tc, ig, genIns,
new Object[] { HOW, nomType, cc });
nomType = Ops.result_o(tc.curFrame);
}
/* If the expected type is Positional, see if we need to do the
* positional bind failover. */
if (nomType == gcx.Positional) {
if (Ops.istype_nd(arg_o, gcx.PositionalBindFailover, tc) != 0) {
SixModelObject ig = Ops.findmethod(arg_o, "cache", tc);
Ops.invokeDirect(tc, ig, Ops.invocantCallSite, new Object[] { arg_o });
arg_o = Ops.result_o(tc.curFrame);
decontValue = Ops.decont(arg_o, tc);
}
else if (Ops.istype_nd(decontValue, gcx.PositionalBindFailover, tc) != 0) {
SixModelObject ig = Ops.findmethod(decontValue, "cache", tc);
Ops.invokeDirect(tc, ig, Ops.invocantCallSite, new Object[] { decontValue });
decontValue = Ops.result_o(tc.curFrame);
}
}
/* If not, do the check. If the wanted nominal type is Mu, then
* anything goes.
* When binding a slurpy named hash while compiling the setting don't check for Associative.
*/
if (nomType != gcx.Mu && !(isSlurpyNamed && nomType == gcx.Associative) && Ops.istype_nd(decontValue, nomType, tc) == 0) {
/* Type check failed; produce error if needed. */
if (error != null) {
SixModelObject thrower = RakOps.getThrower(tc, "X::TypeCheck::Binding::Parameter");
if (thrower != null) {
error[0] = thrower;
error[1] = bindParamThrower;
error[2] = new Object[] { decontValue, nomType.st.WHAT,
varName, param, (long)0 };
}
else {
error[0] = String.format(
"Nominal type check failed for parameter '%s'",
varName);
}
}
/* Report junction failure mode if it's a junction. */
return juncOrFail(tc, gcx, decontValue);
}
/* Also enforce definedness check */
if ( (paramFlags & SIG_ELEM_DEFINEDNES_CHECK) != 0) {
/* Don't check decontValue for concreteness though, but arg_o,
seeing as we don't have a isconcrete_nodecont */
Boolean shouldBeConcrete = (paramFlags & SIG_ELEM_DEFINED_ONLY) != 0 && Ops.isconcrete(arg_o, tc) != 1;
if (shouldBeConcrete || ((paramFlags & SIG_ELEM_UNDEFINED_ONLY) != 0 && Ops.isconcrete(arg_o, tc) == 1)) {
if (error != null) {
String typeName = Ops.typeName(param.get_attribute_boxed(tc,
gcx.Parameter, "$!nominal_type", HINT_nominal_type), tc);
String argName = Ops.typeName(arg_o, tc);
String methodName = cf.codeRef.name;
SixModelObject thrower = RakOps.getThrower(tc, "X::Parameter::InvalidConcreteness");
if (thrower != null) {
error[0] = thrower;
error[1] = bindConcreteThrower;
error[2] = new Object[] { typeName, argName, methodName,
varName, (long)(shouldBeConcrete ? 1 : 0),
(long)(paramFlags & SIG_ELEM_INVOCANT) };
}
else {
if (methodName == null || methodName.isEmpty())
methodName = "<anon>";
error[0] = ((paramFlags & SIG_ELEM_INVOCANT) != 0)
? shouldBeConcrete
? String.format(
"Invocant of method '%s' must be an object instance of type '%s', not a type object of type '%s'. Did you forget a '.new'?",
methodName, typeName, argName)
: String.format(
"Invocant of method '%s' must be a type object of type '%s', not an object instance of type '%s'. Did you forget a 'multi'?",
methodName, typeName, argName)
: shouldBeConcrete
? String.format(
"Parameter '%s' of routine '%s' must be an object instance of type '%s', not a type object of type '%s'. Did you forget a '.new'?",
varName, methodName, typeName, argName)
: String.format(
"Parameter '%s' of routine '%s' must be a type object of type '%s', not an object instance of type '%s'. Did you forget a 'multi'?",
varName, methodName, typeName, argName);
}
}
return juncOrFail(tc, gcx, decontValue);
}
}
}
}
/* Type captures. */
SixModelObject typeCaps = param.get_attribute_boxed(tc, gcx.Parameter,
"@!type_captures", HINT_type_captures);
if (typeCaps != null)
bindTypeCaptures(tc, typeCaps, cf, decontValue.st.WHAT);
/* Do a coercion, if one is needed. */
SixModelObject coerceType = param.get_attribute_boxed(tc, gcx.Parameter,
"$!coerce_type", HINT_coerce_type);
if (coerceType != null) {
/* Coercing natives not possible - nothing to call a method on. */
if (flag != CallSiteDescriptor.ARG_OBJ) {
if (error != null)
error[0] = String.format(
"Unable to coerce natively typed parameter '%s'",
varName);
return BIND_RESULT_FAIL;
}
/* Is the coercion target generic and in need of instantiation?
* (This can happen in (::T, T) where we didn't learn about the
* type until during the signature bind.) */
param.get_attribute_native(tc, gcx.Parameter, "$!coerce_method", HINT_coerce_method);
String methName = tc.native_s;
HOW = coerceType.st.HOW;
SixModelObject archetypesMeth = Ops.findmethod(HOW, "archetypes", tc);
Ops.invokeDirect(tc, archetypesMeth, Ops.invocantCallSite, new Object[] { HOW });
SixModelObject Archetypes = Ops.result_o(tc.curFrame);
SixModelObject genericMeth = Ops.findmethod(Archetypes, "generic", tc);
Ops.invokeDirect(tc, genericMeth, Ops.invocantCallSite, new Object[] { Archetypes });
if (Ops.istrue(Ops.result_o(tc.curFrame), tc) == 1) {
ContextRef = tc.gc.ContextRef;
SixModelObject ctcc = ContextRef.st.REPR.allocate(tc, ContextRef.st);
((ContextRefInstance)ctcc).context = cf;
SixModelObject ctig = Ops.findmethod(HOW, "instantiate_generic", tc);
Ops.invokeDirect(tc, ctig, genIns, new Object[] { HOW, coerceType, ctcc });
coerceType = Ops.result_o(tc.curFrame);
methName = Ops.typeName(coerceType, tc);
}
/* Only coerce if we don't already have the correct type. */
if (Ops.istype(decontValue, coerceType, tc) == 0) {
SixModelObject coerceMeth = Ops.findmethodNonFatal(decontValue, methName, tc);
if (coerceMeth != null) {
Ops.invokeDirect(tc, coerceMeth,
Ops.invocantCallSite,
new Object[] { decontValue });
arg_o = Ops.result_o(tc.curFrame);
decontValue = Ops.decont(arg_o, tc);
}
else {
if (error != null)
error[0] = String.format(
"Unable to coerce value for '%s' to %s; no coercion method defined",
varName, methName);
return BIND_RESULT_FAIL;
}
}
}
/* If it's not got attributive binding, we'll go about binding it into the
* lex pad. */
StaticCodeInfo sci = cf.codeRef.staticInfo;
if ((paramFlags & SIG_ELEM_BIND_ATTRIBUTIVE) == 0) {
/* Is it native? If so, just go ahead and bind it. */
if (flag != CallSiteDescriptor.ARG_OBJ) {
if (hasVarName) {
switch (flag) {
case CallSiteDescriptor.ARG_INT:
cf.iLex[sci.iTryGetLexicalIdx(varName)] = arg_i;
break;
case CallSiteDescriptor.ARG_NUM:
cf.nLex[sci.nTryGetLexicalIdx(varName)] = arg_n;
break;
case CallSiteDescriptor.ARG_STR:
cf.sLex[sci.sTryGetLexicalIdx(varName)] = arg_s;
break;
}
}
}
/* Otherwise it's some objecty case. */
else if (is_rw) {
if (Ops.isrwcont(arg_o, tc) == 1) {
if (hasVarName)
cf.oLex[sci.oTryGetLexicalIdx(varName)] = arg_o;
} else {
SixModelObject thrower = RakOps.getThrower(tc, "X::Parameter::RW");
if (thrower == null) {
error[0] = "Parameter expected a writable container";
} else {
error[0] = thrower;
error[1] = paramReadWriteThrower;
error[2] = new Object[] { decontValue, varName};
}
return BIND_RESULT_FAIL;
}
}
else if (hasVarName) {
if ((paramFlags & SIG_ELEM_IS_RAW) != 0) {
/* Just bind the thing as is into the lexpad. */
cf.oLex[sci.oTryGetLexicalIdx(varName)] = didHLLTransform ? decontValue : arg_o;
}
else {
/* If it's an array, copy means make a new one and store,
* and a normal bind is a straightforward binding plus
* adding a constraint. */
if ((paramFlags & SIG_ELEM_ARRAY_SIGIL) != 0) {
SixModelObject bindee = decontValue;
if ((paramFlags & SIG_ELEM_IS_COPY) != 0) {
SixModelObject BOOTArray = tc.gc.BOOTArray;
bindee = gcx.Array.st.REPR.allocate(tc, gcx.Array.st);
bindee.bind_attribute_boxed(tc, gcx.List, "$!reified",
HINT_LIST_reified, BOOTArray.st.REPR.allocate(tc, BOOTArray.st));
RakOps.p6store(bindee, decontValue, tc);
}
cf.oLex[sci.oTryGetLexicalIdx(varName)] = bindee;
}
/* If it's a hash, similar approach to array. */
else if ((paramFlags & SIG_ELEM_HASH_SIGIL) != 0) {
SixModelObject bindee = decontValue;
if ((paramFlags & SIG_ELEM_IS_COPY) != 0) {
SixModelObject BOOTHash = tc.gc.BOOTHash;
bindee = gcx.Hash.st.REPR.allocate(tc, gcx.Hash.st);
bindee.bind_attribute_boxed(tc, gcx.Map, "$!storage",
HINT_ENUMMAP_storage, BOOTHash.st.REPR.allocate(tc, BOOTHash.st));
RakOps.p6store(bindee, decontValue, tc);
}
cf.oLex[sci.oTryGetLexicalIdx(varName)] = bindee;
}
/* If it's a scalar, we always need to wrap it into a new
* container and store it, for copy or ro case (the rw bit
* in the container descriptor takes care of the rest). */
else {
boolean wrap = (paramFlags & SIG_ELEM_IS_COPY) != 0;
if (!wrap && nomType != null && gcx.Iterable != null) {
wrap = Ops.istype(gcx.Iterable, nomType, tc) != 0
|| Ops.istype(nomType, gcx.Iterable, tc) != 0;
}
if (wrap || varName.equals("$_")) {
STable stScalar = gcx.Scalar.st;
SixModelObject new_cont = stScalar.REPR.allocate(tc, stScalar);
SixModelObject desc = param.get_attribute_boxed(tc, gcx.Parameter,
"$!container_descriptor", HINT_container_descriptor);
new_cont.bind_attribute_boxed(tc, gcx.Scalar, "$!descriptor",
RakudoContainerSpec.HINT_descriptor, desc);
new_cont.bind_attribute_boxed(tc, gcx.Scalar, "$!value",
RakudoContainerSpec.HINT_value, decontValue);
cf.oLex[sci.oTryGetLexicalIdx(varName)] = new_cont;
}
else {
cf.oLex[sci.oTryGetLexicalIdx(varName)] = decontValue;
}
}
}
}
}
/* Is it the invocant? If so, also have to bind to self lexical. */
if ((paramFlags & SIG_ELEM_INVOCANT) != 0)
cf.oLex[sci.oTryGetLexicalIdx("self")] = decontValue;
/* Handle any constraint types (note that they may refer to the parameter by
* name, so we need to have bound it already). */
SixModelObject postConstraints = param.get_attribute_boxed(tc, gcx.Parameter,
"$!post_contraints", HINT_post_constraints);
if (postConstraints != null) {
long numConstraints = postConstraints.elems(tc);
for (long i = 0; i < numConstraints; i++) {
/* Check we meet the constraint. */
SixModelObject consType = postConstraints.at_pos_boxed(tc, i);
SixModelObject acceptsMeth = Ops.findmethod(consType, "ACCEPTS", tc);
if (Ops.isconcrete(consType, tc) == 1 && Ops.istype(consType, gcx.Code, tc) != 0)
RakOps.p6capturelex(consType, tc);
switch (flag) {
case CallSiteDescriptor.ARG_INT:
Ops.invokeDirect(tc, acceptsMeth,
ACCEPTS_i, new Object[] { consType, arg_i });
break;
case CallSiteDescriptor.ARG_NUM:
Ops.invokeDirect(tc, acceptsMeth,
ACCEPTS_n, new Object[] { consType, arg_n });
break;
case CallSiteDescriptor.ARG_STR:
Ops.invokeDirect(tc, acceptsMeth,
ACCEPTS_s, new Object[] { consType, arg_s });
break;
default:
Ops.invokeDirect(tc, acceptsMeth,
ACCEPTS_o, new Object[] { consType, arg_o });
break;
}
if (Ops.istrue(Ops.result_o(tc.curFrame), tc) == 0) {
/* Constraint type check failed; produce error if needed. */
if (error != null) {
SixModelObject thrower = RakOps.getThrower(tc, "X::TypeCheck::Binding::Parameter");
if (thrower != null) {
error[0] = thrower;
error[1] = bindParamThrower;
error[2] = new Object[] { (SixModelObject)origArg,
consType.st.WHAT, varName, param, (long)1 };
}
else {
error[0] = String.format(
"Constraint type check failed for parameter '%s'",
varName);
}
}
return BIND_RESULT_FAIL;
}
}
}
/* TODO: attributives. */
if ((paramFlags & SIG_ELEM_BIND_ATTRIBUTIVE) != 0) {
if (flag != CallSiteDescriptor.ARG_OBJ) {
if (error != null)
error[0] = "Native attributive binding not yet implemented";
return BIND_RESULT_FAIL;
}
int result = assignAttributive(tc, cf, varName, paramFlags,
param.get_attribute_boxed(tc, gcx.Parameter, "$!attr_package", HINT_attr_package),
decontValue, error);
if (result != BIND_RESULT_OK)
return result;
}
/* If it has a sub-signature, bind that. */
SixModelObject subSignature = param.get_attribute_boxed(tc, gcx.Parameter,
"$!sub_signature", HINT_sub_signature);
if (subSignature != null && flag == CallSiteDescriptor.ARG_OBJ) {
/* Turn value into a capture, unless we already have one. */
SixModelObject capture = null;
int result;
if ((paramFlags & SIG_ELEM_IS_CAPTURE) != 0) {
capture = decontValue;
}
else {
SixModelObject meth = Ops.findmethodNonFatal(decontValue, "Capture", tc);
if (meth == null) {
if (error != null)
error[0] = "Could not turn argument into capture";
return BIND_RESULT_FAIL;
}
Ops.invokeDirect(tc, meth, Ops.invocantCallSite, new Object[] { decontValue });
capture = Ops.result_o(tc.curFrame);
}
SixModelObject subParams = subSignature
.get_attribute_boxed(tc, gcx.Signature, "@!params", HINT_SIG_params);
/* Recurse into signature binder. */
CallSiteDescriptor subCsd = explodeCapture(tc, gcx, capture);
result = bind(tc, gcx, cf, subParams, subCsd, tc.flatArgs, noNomTypeCheck, error);
if (result != BIND_RESULT_OK)
{
if (error != null) {
/* Note in the error message that we're in a sub-signature. */
error[0] += " in sub-signature";
/* Have we a variable name? */
if (varName != null) {
error[0] += " of parameter " + varName;
}
}
return result;
}
}
if (RakOps.DEBUG_MODE)
System.err.println("bindOneParam NYFI");
return BIND_RESULT_OK;
}
private static final CallSiteDescriptor exploder = new CallSiteDescriptor(new byte[] {
CallSiteDescriptor.ARG_OBJ | CallSiteDescriptor.ARG_FLAT,
CallSiteDescriptor.ARG_OBJ | CallSiteDescriptor.ARG_FLAT | CallSiteDescriptor.ARG_NAMED
}, null);
public static CallSiteDescriptor explodeCapture(ThreadContext tc, RakOps.GlobalExt gcx, SixModelObject capture) {
capture = Ops.decont(capture, tc);
SixModelObject capType = gcx.Capture;
SixModelObject list = capture.get_attribute_boxed(tc, capType, "@!list", HINT_CAPTURE_list);
SixModelObject hash = capture.get_attribute_boxed(tc, capType, "%!hash", HINT_CAPTURE_hash);
if (list == null)
list = gcx.EMPTYARR;
if (hash == null)
hash = gcx.EMPTYHASH;
return exploder.explodeFlattening(tc.curFrame, new Object[] { list, hash });
}
/* This takes a signature element and either runs the closure to get a default
* value if there is one, or creates an appropriate undefined-ish thingy. */
private static SixModelObject handleOptional(ThreadContext tc, RakOps.GlobalExt gcx, int flags, SixModelObject param, CallFrame cf) {
/* Is the "get default from outer" flag set? */
if ((flags & SIG_ELEM_DEFAULT_FROM_OUTER) != 0) {
param.get_attribute_native(tc, gcx.Parameter, "$!variable_name", HINT_variable_name);
String varName = tc.native_s;
CallFrame curOuter = cf.outer;
while (curOuter != null) {
Integer idx = curOuter.codeRef.staticInfo.oTryGetLexicalIdx(varName);
if (idx != null)
return curOuter.oLex[idx];
curOuter = curOuter.outer;
}
return null;
}
/* Do we have a default value or value closure? */
SixModelObject defaultValue = param.get_attribute_boxed(tc, gcx.Parameter,
"$!default_value", HINT_default_value);
if (defaultValue != null) {
if ((flags & SIG_ELEM_DEFAULT_IS_LITERAL) != 0) {
return defaultValue;
}
else {
/* Thunk; run it to get a value. */
Ops.invokeArgless(tc, defaultValue);
return Ops.result_o(tc.curFrame);
}
}
/* Otherwise, go by sigil to pick the correct default type of value. */
else {
if ((flags & SIG_ELEM_ARRAY_SIGIL) != 0) {
SixModelObject res = gcx.Array.st.REPR.allocate(tc, gcx.Array.st);
return res;
}
else if ((flags & SIG_ELEM_HASH_SIGIL) != 0) {
SixModelObject res = gcx.Hash.st.REPR.allocate(tc, gcx.Hash.st);
return res;
}
else {
param.get_attribute_native(tc, gcx.Parameter, "$!flags", HINT_flags);
int paramFlags = (int)tc.native_i;
switch (paramFlags & SIG_ELEM_NATIVE_VALUE) {
case SIG_ELEM_NATIVE_INT_VALUE:
return createBox(tc, gcx, (long)0, CallSiteDescriptor.ARG_INT);
case SIG_ELEM_NATIVE_NUM_VALUE:
return createBox(tc, gcx, (double)0.0, CallSiteDescriptor.ARG_NUM);
case SIG_ELEM_NATIVE_STR_VALUE:
return createBox(tc, gcx, null, CallSiteDescriptor.ARG_STR);
default:
return param.get_attribute_boxed(tc, gcx.Parameter, "$!nominal_type", HINT_nominal_type);
}
}
}
}
/* Takes a signature along with positional and named arguments and binds them
* into the provided callframe. Returns BIND_RESULT_OK if binding works out,
* BIND_RESULT_FAIL if there is a failure and BIND_RESULT_JUNCTION if the
* failure was because of a Junction being passed (meaning we need to auto-thread). */
private static final CallSiteDescriptor slurpyFromArgs = new CallSiteDescriptor(
new byte[] { CallSiteDescriptor.ARG_OBJ, CallSiteDescriptor.ARG_OBJ }, null);
public static int bind(ThreadContext tc, RakOps.GlobalExt gcx, CallFrame cf, SixModelObject params,
CallSiteDescriptor csd, Object[] args,
boolean noNomTypeCheck, Object[] error) {
int bindFail = BIND_RESULT_OK;
int curPosArg = 0;
/* If we have a |$foo that's followed by slurpies, then we can suppress
* any future arity checks. */
boolean suppressArityFail = false;
/* If we do have some named args, we want to make a clone of the hash
* to work on. We'll delete stuff from it as we bind, and what we have
* left over can become the slurpy hash or - if we aren't meant to be
* taking one - tell us we have a problem. */
HashMap<String, Integer> namedArgsCopy = csd.nameMap == null
? null
: new HashMap<String, Integer>(csd.nameMap);
/* Now we'll walk through the signature and go about binding things. */
int numPosArgs = csd.numPositionals;
long numParams = params.elems(tc);
for (long i = 0; i < numParams; i++) {
/* Get parameter, its flags and any named names. */
SixModelObject param = params.at_pos_boxed(tc, i);
param.get_attribute_native(tc, gcx.Parameter, "$!flags", HINT_flags);
int flags = (int)tc.native_i;
SixModelObject namedNames = param.get_attribute_boxed(tc,
gcx.Parameter, "@!named_names", HINT_named_names);
/* Is it looking for us to bind a capture here? */
if ((flags & SIG_ELEM_IS_CAPTURE) != 0) {
/* Capture the arguments from this point forwards into a Capture.
* Of course, if there's no variable name we can (cheaply) do pretty
* much nothing. */
param.get_attribute_native(tc, gcx.Parameter, "$!variable_name", HINT_variable_name);
if (tc.native_s == null) {
bindFail = BIND_RESULT_OK;
}
else {
SixModelObject posArgs = gcx.EMPTYARR.clone(tc);
for (int k = curPosArg; k < numPosArgs; k++) {
switch (csd.argFlags[k]) {
case CallSiteDescriptor.ARG_OBJ:
posArgs.push_boxed(tc, (SixModelObject)args[k]);
break;
case CallSiteDescriptor.ARG_INT:
posArgs.push_boxed(tc, RakOps.p6box_i((long)args[k], tc));
break;
case CallSiteDescriptor.ARG_NUM:
posArgs.push_boxed(tc, RakOps.p6box_n((double)args[k], tc));
break;
case CallSiteDescriptor.ARG_STR:
posArgs.push_boxed(tc, RakOps.p6box_s((String)args[k], tc));
break;
}
}
SixModelObject namedArgs = vmHashOfRemainingNameds(tc, gcx, namedArgsCopy, args);
SixModelObject capType = gcx.Capture;
SixModelObject capSnap = capType.st.REPR.allocate(tc, capType.st);
capSnap.bind_attribute_boxed(tc, capType, "@!list", HINT_CAPTURE_list, posArgs);
capSnap.bind_attribute_boxed(tc, capType, "%!hash", HINT_CAPTURE_hash, namedArgs);
bindFail = bindOneParam(tc, gcx, cf, param, capSnap, CallSiteDescriptor.ARG_OBJ,
noNomTypeCheck, false, error);
}
if (bindFail != 0) {
return bindFail;
}
else if (i + 1 == numParams) {
/* Since a capture acts as "the ultimate slurpy" in a sense, if
* this is the last parameter in the signature we can return
* success right off the bat. */
return BIND_RESULT_OK;
}
else {
SixModelObject nextParam = params.at_pos_boxed(tc, i + 1);
nextParam.get_attribute_native(tc, gcx.Parameter, "$!flags", HINT_flags);
if (((int)tc.native_i & (SIG_ELEM_SLURPY_POS | SIG_ELEM_SLURPY_NAMED)) != 0)
suppressArityFail = true;
}
}
/* Could it be a named slurpy? */
else if ((flags & SIG_ELEM_SLURPY_NAMED) != 0) {
SixModelObject slurpy = vmHashOfRemainingNameds(tc, gcx, namedArgsCopy, args);
SixModelObject bindee = gcx.Hash.st.REPR.allocate(tc, gcx.Hash.st);
bindee.bind_attribute_boxed(tc, gcx.Map, "$!storage",
HINT_ENUMMAP_storage, slurpy);
bindFail = bindOneParam(tc, gcx, cf, param, bindee, CallSiteDescriptor.ARG_OBJ,
noNomTypeCheck, true, error);
if (bindFail != 0)
return bindFail;
/* Nullify named arguments hash now we've consumed it, to mark all
* is well. */
namedArgsCopy = null;
}
/* Otherwise, maybe it's a positional of some kind. */
else if (namedNames == null) {
/* Slurpy or LoL-slurpy? */
if ((flags & (SIG_ELEM_SLURPY_POS | SIG_ELEM_SLURPY_LOL | SIG_ELEM_SLURPY_ONEARG)) != 0) {
/* Create Perl 6 array, create VM array of all remaining things,
* then store it. */
SixModelObject slurpy = gcx.EMPTYARR.clone(tc);
while (curPosArg < numPosArgs) {
switch (csd.argFlags[curPosArg]) {
case CallSiteDescriptor.ARG_OBJ:
slurpy.push_boxed(tc, (SixModelObject)args[curPosArg]);
break;
case CallSiteDescriptor.ARG_INT:
slurpy.push_boxed(tc, RakOps.p6box_i((long)args[curPosArg], tc));
break;
case CallSiteDescriptor.ARG_NUM:
slurpy.push_boxed(tc, RakOps.p6box_n((double)args[curPosArg], tc));
break;
case CallSiteDescriptor.ARG_STR:
slurpy.push_boxed(tc, RakOps.p6box_s((String)args[curPosArg], tc));
break;
}
curPosArg++;
}
SixModelObject slurpyType = (flags & SIG_ELEM_IS_RAW) != 0 ? gcx.List : gcx.Array;
SixModelObject sm = Ops.findmethod(slurpyType,
(flags & SIG_ELEM_SLURPY_ONEARG) != 0 ? "from-slurpy-onearg" :
(flags & SIG_ELEM_SLURPY_POS) != 0 ? "from-slurpy-flat" : "from-slurpy",
tc);
Ops.invokeDirect(tc, sm, slurpyFromArgs, new Object[] { slurpyType, slurpy });
SixModelObject bindee = Ops.result_o(tc.curFrame);
bindFail = bindOneParam(tc, gcx, cf, param, bindee, CallSiteDescriptor.ARG_OBJ,
noNomTypeCheck, false, error);
if (bindFail != 0)
return bindFail;
}
/* Otherwise, a positional. */
else {
/* Do we have a value?. */
if (curPosArg < numPosArgs) {
/* Easy - just bind that. */