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Be able to determine if two types can be converted without requiring an Expr *.

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The Expr::TypeConv() method has been replaced with both a
CanConvertTypes() routine that indicates whether one type
can be converted to another and a TypeConvertExpr()
routine that provides the same functionality as
Expr::TypeConv() used to.
This commit is contained in:
Matt Pharr
2011-10-30 14:12:12 -07:00
parent d5a8538192
commit e009c0a61d
5 changed files with 231 additions and 176 deletions
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17
ctx.cpp
View File

@@ -652,18 +652,19 @@ FunctionEmitContext::CurrentLanesReturned(Expr *expr, bool doCoherenceCheck) {
}
else {
if (expr == NULL) {
Error(funcStartPos,
"Must provide return value for return statement for non-void function.");
Error(funcStartPos, "Must provide return value for return "
"statement for non-void function.");
return;
}
// Use a masked store to store the value of the expression in the
// return value memory; this preserves the return values from other
// lanes that may have executed return statements previously.
Expr *r = expr->TypeConv(returnType, "return statement");
if (r != NULL) {
llvm::Value *retVal = r->GetValue(this);
expr = TypeConvertExpr(expr, returnType, "return statement");
if (expr != NULL) {
llvm::Value *retVal = expr->GetValue(this);
if (retVal != NULL)
// Use a masked store to store the value of the expression
// in the return value memory; this preserves the return
// values from other lanes that may have executed return
// statements previously.
StoreInst(retVal, returnValuePtr, GetInternalMask(), returnType);
}
}

339
expr.cpp
View File

@@ -125,33 +125,34 @@ lMaybeIssuePrecisionWarning(const AtomicType *toAtomicType,
}
#endif
Expr *
Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
bool issuePrecisionWarnings) {
///////////////////////////////////////////////////////////////////////////
static bool
lDoTypeConv(const Type *fromType, const Type *toType, Expr **expr,
bool failureOk, const char *errorMsgBase, SourcePos pos) {
/* This function is way too long and complex. Is type conversion stuff
always this messy, or can this be cleaned up somehow? */
assert(failureOk || errorMsgBase != NULL);
const Type *fromType = GetType();
if (toType == NULL || fromType == NULL)
return this;
return false;
// The types are equal; there's nothing to do
if (Type::Equal(toType, fromType))
return this;
return true;
if (fromType == AtomicType::Void) {
if (!failureOk)
Error(pos, "Can't convert from \"void\" to \"%s\" for %s.",
toType->GetString().c_str(), errorMsgBase);
return NULL;
return false;
}
if (toType == AtomicType::Void) {
if (!failureOk)
Error(pos, "Can't convert type \"%s\" to \"void\" for %s.",
fromType->GetString().c_str(), errorMsgBase);
return NULL;
return false;
}
if (toType->IsUniformType() && fromType->IsVaryingType()) {
@@ -159,13 +160,24 @@ Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
Error(pos, "Can't convert from varying type \"%s\" to uniform "
"type \"%s\" for %s.", fromType->GetString().c_str(),
toType->GetString().c_str(), errorMsgBase);
return NULL;
return false;
}
const ArrayType *toArrayType = dynamic_cast<const ArrayType *>(toType);
const ArrayType *fromArrayType = dynamic_cast<const ArrayType *>(fromType);
const VectorType *toVectorType = dynamic_cast<const VectorType *>(toType);
const VectorType *fromVectorType = dynamic_cast<const VectorType *>(fromType);
const StructType *toStructType = dynamic_cast<const StructType *>(toType);
const StructType *fromStructType = dynamic_cast<const StructType *>(fromType);
const EnumType *toEnumType = dynamic_cast<const EnumType *>(toType);
const EnumType *fromEnumType = dynamic_cast<const EnumType *>(fromType);
const AtomicType *toAtomicType = dynamic_cast<const AtomicType *>(toType);
const AtomicType *fromAtomicType = dynamic_cast<const AtomicType *>(fromType);
// Convert from type T -> const T; just return a TypeCast expr, which
// can handle this
if (Type::Equal(toType, fromType->GetAsConstType()))
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
if (dynamic_cast<const ReferenceType *>(fromType)) {
if (dynamic_cast<const ReferenceType *>(toType)) {
@@ -173,75 +185,91 @@ Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
// this is handled by TypeCastExpr
if (Type::Equal(toType->GetReferenceTarget(),
fromType->GetReferenceTarget()->GetAsConstType()))
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
const ArrayType *atFrom =
dynamic_cast<const ArrayType *>(fromType->GetReferenceTarget());
const ArrayType *atTo =
dynamic_cast<const ArrayType *>(toType->GetReferenceTarget());
const ArrayType *atFrom = dynamic_cast<const ArrayType *>(fromType->GetReferenceTarget());
const ArrayType *atTo = dynamic_cast<const ArrayType *>(toType->GetReferenceTarget());
if (atFrom != NULL && atTo != NULL &&
Type::Equal(atFrom->GetElementType(), atTo->GetElementType()))
return new TypeCastExpr(toType, this, false, pos);
Type::Equal(atFrom->GetElementType(), atTo->GetElementType())) {
goto typecast_ok;
}
else {
if (!failureOk)
Error(pos, "Can't convert between incompatible reference types \"%s\" "
"and \"%s\" for %s.", fromType->GetString().c_str(),
toType->GetString().c_str(), errorMsgBase);
return NULL;
return false;
}
}
else {
// convert from a reference T -> T
Expr *fromExpr = new DereferenceExpr(this, pos);
if (fromExpr->GetType() == NULL)
return NULL;
return fromExpr->TypeConv(toType, errorMsgBase, failureOk);
if (expr != NULL) {
Expr *drExpr = new DereferenceExpr(*expr, pos);
if (lDoTypeConv(drExpr->GetType(), toType, &drExpr, failureOk,
errorMsgBase, pos) == true) {
*expr = drExpr;
return true;
}
return false;
}
else
return lDoTypeConv(fromType->GetReferenceTarget(), toType, NULL,
failureOk, errorMsgBase, pos);
}
}
else if (dynamic_cast<const ReferenceType *>(toType)) {
// T -> reference T
Expr *fromExpr = new ReferenceExpr(this, pos);
if (fromExpr->GetType() == NULL)
return NULL;
return fromExpr->TypeConv(toType, errorMsgBase, failureOk);
if (expr != NULL) {
Expr *rExpr = new ReferenceExpr(*expr, pos);
if (lDoTypeConv(rExpr->GetType(), toType, &rExpr, failureOk,
errorMsgBase, pos) == true) {
*expr = rExpr;
return true;
}
return false;
}
else
return lDoTypeConv(new ReferenceType(fromType, toType->IsConstType()),
toType, NULL, failureOk, errorMsgBase, pos);
}
else if (Type::Equal(toType, fromType->GetAsNonConstType()))
// convert: const T -> T (as long as T isn't a reference)
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
fromType = fromType->GetReferenceTarget();
toType = toType->GetReferenceTarget();
// I don't think this is necessary
//CO if (Type::Equal(toType, fromType))
//CO return fromExpr;
const ArrayType *toArrayType = dynamic_cast<const ArrayType *>(toType);
const ArrayType *fromArrayType = dynamic_cast<const ArrayType *>(fromType);
if (toArrayType && fromArrayType) {
if (Type::Equal(toArrayType->GetElementType(),
fromArrayType->GetElementType())) {
// the case of different element counts should have returned
// out earlier, yes??
assert(toArrayType->GetElementCount() != fromArrayType->GetElementCount());
return new TypeCastExpr(new ReferenceType(toType, false), this,
false, pos);
if (expr != NULL)
*expr = new TypeCastExpr(new ReferenceType(toType, false),
*expr, false, pos);
return true;
}
else if (Type::Equal(toArrayType->GetElementType(),
fromArrayType->GetElementType()->GetAsConstType())) {
// T[x] -> const T[x]
return new TypeCastExpr(new ReferenceType(toType, false), this,
false, pos);
if (expr != NULL)
*expr = new TypeCastExpr(new ReferenceType(toType, false),
*expr, false, pos);
return true;
}
else {
if (!failureOk)
Error(pos, "Array type \"%s\" can't be converted to type \"%s\" for %s.",
fromType->GetString().c_str(), toType->GetString().c_str(),
errorMsgBase);
return NULL;
return false;
}
}
const VectorType *toVectorType = dynamic_cast<const VectorType *>(toType);
const VectorType *fromVectorType = dynamic_cast<const VectorType *>(fromType);
if (toVectorType && fromVectorType) {
// converting e.g. int<n> -> float<n>
if (fromVectorType->GetElementCount() != toVectorType->GetElementCount()) {
@@ -249,13 +277,11 @@ Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
Error(pos, "Can't convert between differently sized vector types "
"\"%s\" -> \"%s\" for %s.", fromType->GetString().c_str(),
toType->GetString().c_str(), errorMsgBase);
return NULL;
return false;
}
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
}
const StructType *toStructType = dynamic_cast<const StructType *>(toType);
const StructType *fromStructType = dynamic_cast<const StructType *>(fromType);
if (toStructType && fromStructType) {
if (!Type::Equal(toStructType->GetAsUniformType()->GetAsConstType(),
fromStructType->GetAsUniformType()->GetAsConstType())) {
@@ -263,14 +289,11 @@ Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
Error(pos, "Can't convert between different struct types "
"\"%s\" -> \"%s\".", fromStructType->GetString().c_str(),
toStructType->GetString().c_str());
return NULL;
return false;
}
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
}
const EnumType *toEnumType = dynamic_cast<const EnumType *>(toType);
const EnumType *fromEnumType = dynamic_cast<const EnumType *>(fromType);
if (toEnumType != NULL && fromEnumType != NULL) {
// No implicit conversions between different enum types
if (!Type::Equal(toEnumType->GetAsUniformType()->GetAsConstType(),
@@ -279,19 +302,15 @@ Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
Error(pos, "Can't convert between different enum types "
"\"%s\" -> \"%s\".", fromEnumType->GetString().c_str(),
toEnumType->GetString().c_str());
return NULL;
return false;
}
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
}
const AtomicType *toAtomicType = dynamic_cast<const AtomicType *>(toType);
const AtomicType *fromAtomicType = dynamic_cast<const AtomicType *>(fromType);
// enum -> atomic (integer, generally...) is always ok
if (fromEnumType != NULL) {
assert(toAtomicType != NULL || toVectorType != NULL);
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
}
// from here on out, the from type can only be atomic something or
@@ -301,12 +320,12 @@ Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
Error(pos, "Type conversion only possible from atomic types, not "
"from \"%s\" to \"%s\", for %s.", fromType->GetString().c_str(),
toType->GetString().c_str(), errorMsgBase);
return NULL;
return false;
}
// scalar -> short-vector conversions
if (toVectorType != NULL)
return new TypeCastExpr(toType, this, false, pos);
goto typecast_ok;
// ok, it better be a scalar->scalar conversion of some sort by now
if (toAtomicType == NULL) {
@@ -315,17 +334,34 @@ Expr::TypeConv(const Type *toType, const char *errorMsgBase, bool failureOk,
"from \"%s\" to \"%s\", for %s.",
fromType->GetString().c_str(), toType->GetString().c_str(),
errorMsgBase);
return NULL;
return false;
}
#if 0
// Disable: it's not clear this is actually all that useful
if (!failureOk && issuePrecisionWarnings)
lMaybeIssuePrecisionWarning(toAtomicType, fromAtomicType, pos,
errorMsgBase);
#endif
typecast_ok:
if (expr != NULL)
*expr = new TypeCastExpr(toType, *expr, false, pos);
return true;
}
return new TypeCastExpr(toType, this, false, pos);
bool
CanConvertTypes(const Type *fromType, const Type *toType) {
return lDoTypeConv(fromType, toType, NULL, true, NULL, SourcePos());
}
Expr *
TypeConvertExpr(Expr *expr, const Type *toType, const char *errorMsgBase) {
if (expr == NULL)
return NULL;
const Type *fromType = expr->GetType();
Expr *e = expr;
if (lDoTypeConv(fromType, toType, &e, false, errorMsgBase,
expr->pos))
return e;
else
return NULL;
}
@@ -770,8 +806,8 @@ UnaryExpr::TypeCheck() {
}
else if (op == LogicalNot) {
const Type *boolType = lMatchingBoolType(type);
expr = expr->TypeConv(boolType, "logical not");
if (!expr)
expr = TypeConvertExpr(expr, boolType, "logical not");
if (expr == NULL)
return NULL;
}
else if (op == BitNot) {
@@ -1383,10 +1419,13 @@ BinaryExpr::TypeCheck() {
bool isVarying = (type0->IsVaryingType() ||
type1->IsVaryingType());
if (isVarying) {
arg0 = arg0->TypeConv(type0->GetAsVaryingType(), "shift operator");
arg0 = TypeConvertExpr(arg0, type0->GetAsVaryingType(),
"shift operator");
if (arg0 == NULL)
return NULL;
type0 = arg0->GetType();
}
arg1 = arg1->TypeConv(type0, "shift operator", false, false);
arg1 = TypeConvertExpr(arg1, type0, "shift operator");
if (arg1 == NULL)
return NULL;
}
@@ -1396,8 +1435,8 @@ BinaryExpr::TypeCheck() {
if (promotedType == NULL)
return NULL;
arg0 = arg0->TypeConv(promotedType, "binary bit op");
arg1 = arg1->TypeConv(promotedType, "binary bit op");
arg0 = TypeConvertExpr(arg0, promotedType, "binary bit op");
arg1 = TypeConvertExpr(arg1, promotedType, "binary bit op");
if (arg0 == NULL || arg1 == NULL)
return NULL;
}
@@ -1431,9 +1470,9 @@ BinaryExpr::TypeCheck() {
if (promotedType == NULL)
return NULL;
arg0 = arg0->TypeConv(promotedType, lOpString(op));
arg1 = arg1->TypeConv(promotedType, lOpString(op));
if (!arg0 || !arg1)
arg0 = TypeConvertExpr(arg0, promotedType, lOpString(op));
arg1 = TypeConvertExpr(arg1, promotedType, lOpString(op));
if (arg0 == NULL || arg1 == NULL)
return NULL;
return this;
}
@@ -1459,9 +1498,9 @@ BinaryExpr::TypeCheck() {
if (promotedType == NULL)
return NULL;
arg0 = arg0->TypeConv(promotedType, lOpString(op));
arg1 = arg1->TypeConv(promotedType, lOpString(op));
if (!arg0 || !arg1)
arg0 = TypeConvertExpr(arg0, promotedType, lOpString(op));
arg1 = TypeConvertExpr(arg1, promotedType, lOpString(op));
if (arg0 == NULL || arg1 == NULL)
return NULL;
return this;
}
@@ -1490,10 +1529,10 @@ BinaryExpr::TypeCheck() {
destType = new VectorType(boolType, vtype1->GetElementCount());
else
destType = boolType;
arg0 = arg0->TypeConv(destType, lOpString(op));
arg1 = arg1->TypeConv(destType, lOpString(op));
if (!arg0 || !arg1)
arg0 = TypeConvertExpr(arg0, destType, lOpString(op));
arg1 = TypeConvertExpr(arg1, destType, lOpString(op));
if (arg0 == NULL || arg1 == NULL)
return NULL;
return this;
}
@@ -1726,9 +1765,11 @@ AssignExpr::TypeCheck() {
lvalue = lvalue->TypeCheck();
if (rvalue != NULL)
rvalue = rvalue->TypeCheck();
if (rvalue != NULL && lvalue != NULL)
rvalue = rvalue->TypeConv(lvalue->GetType(), "assignment");
if (rvalue == NULL || lvalue == NULL)
if (lvalue == NULL || rvalue == NULL)
return NULL;
rvalue = TypeConvertExpr(rvalue, lvalue->GetType(), "assignment");
if (rvalue == NULL)
return NULL;
if (lvalue->GetType()->IsConstType()) {
@@ -1982,8 +2023,8 @@ SelectExpr::TypeCheck() {
const Type *testType = test->GetType();
if (testType == NULL)
return NULL;
test = test->TypeConv(lMatchingBoolType(testType), "select");
if (testType == NULL)
test = TypeConvertExpr(test, lMatchingBoolType(testType), "select");
if (test == NULL)
return NULL;
testType = test->GetType();
@@ -1994,9 +2035,9 @@ SelectExpr::TypeCheck() {
if (promotedType == NULL)
return NULL;
expr1 = expr1->TypeConv(promotedType, "select");
expr2 = expr2->TypeConv(promotedType, "select");
if (!expr1 || !expr2)
expr1 = TypeConvertExpr(expr1, promotedType, "select");
expr2 = TypeConvertExpr(expr2, promotedType, "select");
if (expr1 == NULL || expr2 == NULL)
return NULL;
return this;
@@ -2099,7 +2140,8 @@ FunctionCallExpr::GetValue(FunctionEmitContext *ctx) const {
}
// Do whatever type conversion is needed
argExpr = argExpr->TypeConv(argTypes[i], "function call argument");
argExpr = TypeConvertExpr(argExpr, argTypes[i],
"function call argument");
// The function overload resolution code should have ensured that
// we can successfully do any type conversions needed here.
assert(argExpr != NULL);
@@ -2112,13 +2154,11 @@ FunctionCallExpr::GetValue(FunctionEmitContext *ctx) const {
// FIXME: should we do this during type checking?
const std::vector<ConstExpr *> &argumentDefaults = ft->GetArgumentDefaults();
for (unsigned int i = callargs.size(); i < argumentDefaults.size(); ++i) {
assert(argumentDefaults[i] != NULL);
Expr *defaultExpr = argumentDefaults[i]->TypeConv(argTypes[i],
"function call default argument");
if (defaultExpr == NULL)
Expr * d = TypeConvertExpr(argumentDefaults[i], argTypes[i],
"function call default argument");
if (d == NULL)
return NULL;
callargs.push_back(defaultExpr);
callargs.push_back(d);
}
// Now evaluate the values of all of the parameters being passed. We
@@ -2256,7 +2296,17 @@ FunctionCallExpr::TypeCheck() {
return NULL;
}
if (fse->ResolveOverloads(args->exprs) == true) {
std::vector<const Type *> argTypes;
for (unsigned int i = 0; i < args->exprs.size(); ++i) {
if (args->exprs[i] == NULL)
return NULL;
const Type *t = args->exprs[i]->GetType();
if (t == NULL)
return NULL;
argTypes.push_back(t);
}
if (fse->ResolveOverloads(argTypes) == true) {
func = fse->TypeCheck();
if (func != NULL) {
@@ -2271,9 +2321,9 @@ FunctionCallExpr::TypeCheck() {
return NULL;
launchCountExpr =
launchCountExpr->TypeConv(AtomicType::UniformInt32,
"task launch count");
if (!launchCountExpr)
TypeConvertExpr(launchCountExpr, AtomicType::UniformInt32,
"task launch count");
if (launchCountExpr == NULL)
return NULL;
}
else {
@@ -2621,8 +2671,8 @@ IndexExpr::TypeCheck() {
!g->opt.disableUniformMemoryOptimizations);
const Type *indexType = isUniform ? AtomicType::UniformInt32 :
AtomicType::VaryingInt32;
index = index->TypeConv(indexType, "array index");
if (!index)
index = TypeConvertExpr(index, indexType, "array index");
if (index == NULL)
return NULL;
return this;
@@ -5191,16 +5241,16 @@ lPrintFunctionOverloads(const std::string &name,
static void
lPrintPassedTypes(const char *funName, const std::vector<Expr *> &argExprs) {
lPrintPassedTypes(const char *funName,
const std::vector<const Type *> &argTypes) {
fprintf(stderr, "Passed types: %*c(", (int)strlen(funName), ' ');
for (unsigned int i = 0; i < argExprs.size(); ++i) {
const Type *t;
if (argExprs[i] != NULL && (t = argExprs[i]->GetType()) != NULL)
fprintf(stderr, "%s%s", t->GetString().c_str(),
(i < argExprs.size()-1) ? ", " : ")\n\n");
for (unsigned int i = 0; i < argTypes.size(); ++i) {
if (argTypes[i] != NULL)
fprintf(stderr, "%s%s", argTypes[i]->GetString().c_str(),
(i < argTypes.size()-1) ? ", " : ")\n\n");
else
fprintf(stderr, "(unknown type)%s",
(i < argExprs.size()-1) ? ", " : ")\n\n");
(i < argTypes.size()-1) ? ", " : ")\n\n");
}
}
@@ -5211,9 +5261,7 @@ lPrintPassedTypes(const char *funName, const std::vector<Expr *> &argExprs) {
failure.
*/
static int
lExactMatch(Expr *callArg, const Type *funcArgType) {
const Type *callType = callArg->GetType();
lExactMatch(const Type *callType, const Type *funcArgType) {
if (dynamic_cast<const ReferenceType *>(callType) == NULL)
callType = callType->GetAsNonConstType();
if (dynamic_cast<const ReferenceType *>(funcArgType) != NULL &&
@@ -5229,12 +5277,12 @@ lExactMatch(Expr *callArg, const Type *funcArgType) {
modulo conversion to a reference type if needed.
*/
static int
lMatchIgnoringReferences(Expr *callArg, const Type *funcArgType) {
int prev = lExactMatch(callArg, funcArgType);
lMatchIgnoringReferences(const Type *callType, const Type *funcArgType) {
int prev = lExactMatch(callType, funcArgType);
if (prev != -1)
return prev;
const Type *callType = callArg->GetType()->GetReferenceTarget();
callType = callType->GetReferenceTarget();
if (funcArgType->IsConstType())
callType = callType->GetAsConstType();
@@ -5247,12 +5295,11 @@ lMatchIgnoringReferences(Expr *callArg, const Type *funcArgType) {
conversion that won't lose information. Otherwise reports failure.
*/
static int
lMatchWithTypeWidening(Expr *callArg, const Type *funcArgType) {
int prev = lMatchIgnoringReferences(callArg, funcArgType);
lMatchWithTypeWidening(const Type *callType, const Type *funcArgType) {
int prev = lMatchIgnoringReferences(callType, funcArgType);
if (prev != -1)
return prev;
const Type *callType = callArg->GetType();
const AtomicType *callAt = dynamic_cast<const AtomicType *>(callType);
const AtomicType *funcAt = dynamic_cast<const AtomicType *>(funcArgType);
if (callAt == NULL || funcAt == NULL)
@@ -5299,12 +5346,11 @@ lMatchWithTypeWidening(Expr *callArg, const Type *funcArgType) {
exactly the same type.
*/
static int
lMatchIgnoringUniform(Expr *callArg, const Type *funcArgType) {
int prev = lMatchWithTypeWidening(callArg, funcArgType);
lMatchIgnoringUniform(const Type *callType, const Type *funcArgType) {
int prev = lMatchWithTypeWidening(callType, funcArgType);
if (prev != -1)
return prev;
const Type *callType = callArg->GetType();
if (dynamic_cast<const ReferenceType *>(callType) == NULL)
callType = callType->GetAsNonConstType();
@@ -5319,15 +5365,14 @@ lMatchIgnoringUniform(Expr *callArg, const Type *funcArgType) {
argument type, but without doing a uniform -> varying conversion.
*/
static int
lMatchWithTypeConvSameVariability(Expr *callArg, const Type *funcArgType) {
int prev = lMatchIgnoringUniform(callArg, funcArgType);
lMatchWithTypeConvSameVariability(const Type *callType,
const Type *funcArgType) {
int prev = lMatchIgnoringUniform(callType, funcArgType);
if (prev != -1)
return prev;
Expr *te = callArg->TypeConv(funcArgType,
"function call argument", true);
if (te != NULL &&
te->GetType()->IsUniformType() == callArg->GetType()->IsUniformType())
if (CanConvertTypes(callType, funcArgType) &&
(callType->IsUniformType() == funcArgType->IsUniformType()))
return 1;
else
return -1;
@@ -5339,14 +5384,12 @@ lMatchWithTypeConvSameVariability(Expr *callArg, const Type *funcArgType) {
argument type to the function argument type.
*/
static int
lMatchWithTypeConv(Expr *callArg, const Type *funcArgType) {
int prev = lMatchWithTypeConvSameVariability(callArg, funcArgType);
lMatchWithTypeConv(const Type *callType, const Type *funcArgType) {
int prev = lMatchWithTypeConvSameVariability(callType, funcArgType);
if (prev != -1)
return prev;
Expr *te = callArg->TypeConv(funcArgType,
"function call argument", true);
return (te != NULL) ? 0 : -1;
return CanConvertTypes(callType, funcArgType) ? 0 : -1;
}
@@ -5383,8 +5426,8 @@ lGetBestMatch(std::vector<std::pair<int, Symbol *> > &matches) {
finding multiple ambiguous matches.
*/
bool
FunctionSymbolExpr::tryResolve(int (*matchFunc)(Expr *, const Type *),
const std::vector<Expr *> &callArgs) {
FunctionSymbolExpr::tryResolve(int (*matchFunc)(const Type *, const Type *),
const std::vector<const Type *> &callTypes) {
const char *funName = candidateFunctions->front()->name.c_str();
std::vector<std::pair<int, Symbol *> > matches;
@@ -5401,7 +5444,7 @@ FunctionSymbolExpr::tryResolve(int (*matchFunc)(Expr *, const Type *),
// There's no way to match if the caller is passing more arguments
// than this function instance takes.
if (callArgs.size() > funcArgTypes.size())
if (callTypes.size() > funcArgTypes.size())
continue;
unsigned int i;
@@ -5410,23 +5453,23 @@ FunctionSymbolExpr::tryResolve(int (*matchFunc)(Expr *, const Type *),
// function than are passed, if the function has default argument
// values. This case is handled below.
int cost = 0;
for (i = 0; i < callArgs.size(); ++i) {
for (i = 0; i < callTypes.size(); ++i) {
// This may happen if there's an error earlier in compilation.
// It's kind of a silly to redundantly discover this for each
// potential match versus detecting this earlier in the
// matching process and just giving up.
if (!callArgs[i] || !callArgs[i]->GetType() || !funcArgTypes[i] ||
dynamic_cast<const FunctionType *>(callArgs[i]->GetType()) != NULL)
if (callTypes[i] == NULL || funcArgTypes[i] == NULL ||
dynamic_cast<const FunctionType *>(callTypes[i]) != NULL)
return false;
int argCost = matchFunc(callArgs[i], funcArgTypes[i]);
int argCost = matchFunc(callTypes[i], funcArgTypes[i]);
if (argCost == -1)
// If the predicate function returns -1, we have failed no
// matter what else happens, so we stop trying
break;
cost += argCost;
}
if (i == callArgs.size()) {
if (i == callTypes.size()) {
// All of the arguments matched!
if (i == funcArgTypes.size())
// And we have exactly as many arguments as the function
@@ -5454,7 +5497,7 @@ FunctionSymbolExpr::tryResolve(int (*matchFunc)(Expr *, const Type *),
Error(pos, "Multiple overloaded instances of function \"%s\" matched.",
funName);
lPrintFunctionOverloads(funName, matches);
lPrintPassedTypes(funName, callArgs);
lPrintPassedTypes(funName, callTypes);
// Stop trying to find more matches after an ambigious set of
// matches.
return true;
@@ -5463,7 +5506,7 @@ FunctionSymbolExpr::tryResolve(int (*matchFunc)(Expr *, const Type *),
bool
FunctionSymbolExpr::ResolveOverloads(const std::vector<Expr *> &callArgs) {
FunctionSymbolExpr::ResolveOverloads(const std::vector<const Type *> &argTypes) {
// Functions with names that start with "__" should only be various
// builtins. For those, we'll demand an exact match, since we'll
// expect whichever function in stdlib.ispc is calling out to one of
@@ -5474,32 +5517,32 @@ FunctionSymbolExpr::ResolveOverloads(const std::vector<Expr *> &callArgs) {
// Is there an exact match that doesn't require any argument type
// conversion (other than converting type -> reference type)?
if (tryResolve(lExactMatch, callArgs))
if (tryResolve(lExactMatch, argTypes))
return true;
if (exactMatchOnly == false) {
// Try to find a single match ignoring references
if (tryResolve(lMatchIgnoringReferences, callArgs))
if (tryResolve(lMatchIgnoringReferences, argTypes))
return true;
// Try to find an exact match via type widening--i.e. int8 ->
// int16, etc.--things that don't lose data.
if (tryResolve(lMatchWithTypeWidening, callArgs))
if (tryResolve(lMatchWithTypeWidening, argTypes))
return true;
// Next try to see if there's a match via just uniform -> varying
// promotions.
if (tryResolve(lMatchIgnoringUniform, callArgs))
if (tryResolve(lMatchIgnoringUniform, argTypes))
return true;
// Try to find a match via type conversion, but don't change
// unif->varying
if (tryResolve(lMatchWithTypeConvSameVariability,
callArgs))
argTypes))
return true;
// Last chance: try to find a match via arbitrary type conversion.
if (tryResolve(lMatchWithTypeConv, callArgs))
if (tryResolve(lMatchWithTypeConv, argTypes))
return true;
}
@@ -5508,7 +5551,7 @@ FunctionSymbolExpr::ResolveOverloads(const std::vector<Expr *> &callArgs) {
Error(pos, "Unable to find matching overload for call to function \"%s\"%s.",
funName, exactMatchOnly ? " only considering exact matches" : "");
lPrintFunctionOverloads(funName, *candidateFunctions);
lPrintPassedTypes(funName, callArgs);
lPrintPassedTypes(funName, argTypes);
return false;
}

29
expr.h
View File

@@ -89,14 +89,6 @@ public:
/** Prints the expression to standard output (used for debugging). */
virtual void Print() const = 0;
/** This method tries to convert the expression to the given type. In
the event of failure, if the failureOk parameter is true, then no
error is issued. If failureOk is false, then an error is printed
that incorporates the given error message string. In either
failure case, NULL is returned. */
Expr *TypeConv(const Type *type, const char *errorMsgBase = NULL,
bool failureOk = false, bool issuePrecisionWarnings = true);
};
@@ -577,12 +569,12 @@ public:
void Print() const;
int EstimateCost() const;
bool ResolveOverloads(const std::vector<Expr *> &args);
bool ResolveOverloads(const std::vector<const Type *> &argTypes);
Symbol *GetMatchingFunction();
private:
bool tryResolve(int (*matchFunc)(Expr *, const Type *),
const std::vector<Expr *> &args);
bool tryResolve(int (*matchFunc)(const Type *, const Type *),
const std::vector<const Type *> &argTypes);
/** Name of the function that is being called. */
std::string name;
@@ -611,4 +603,19 @@ public:
int EstimateCost() const;
};
/** This function indicates whether it's legal to convert from fromType to
toType.
*/
bool CanConvertTypes(const Type *fromType, const Type *toType);
/** This function attempts to convert the given expression to the given
type, returning a pointer to a new expression that is the result. If
the required type conversion is illegal, it returns NULL and prints an
error message using the provided string to indicate the context for
which type conversion was being applied (e.g. "function call
parameter").
*/
Expr *TypeConvertExpr(Expr *expr, const Type *toType, const char *errorMsgBase);
#endif // ISPC_EXPR_H

4
module.cpp
View File

@@ -256,8 +256,8 @@ Module::AddGlobalVariable(Symbol *sym, Expr *initExpr, bool isConst) {
// ExprList; they don't have types per se / can't type
// convert themselves anyway.)
if (dynamic_cast<ExprList *>(initExpr) == NULL)
initExpr = initExpr->TypeConv(sym->type, "initializer");
initExpr = TypeConvertExpr(initExpr, sym->type, "initializer");
if (initExpr != NULL) {
initExpr = initExpr->Optimize();
// Fingers crossed, now let's see if we've got a

18
stmt.cpp
View File

@@ -146,9 +146,9 @@ lInitSymbol(llvm::Value *lvalue, const char *symName, const Type *type,
// ExprList, then we'll see if we can type convert it to the type of
// the variable.
if (dynamic_cast<ExprList *>(initExpr) == NULL) {
Expr *tcInit = initExpr->TypeConv(type, "inititalizer", true);
if (tcInit != NULL) {
llvm::Value *initializerValue = tcInit->GetValue(ctx);
initExpr = TypeConvertExpr(initExpr, type, "initializer");
if (initExpr != NULL) {
llvm::Value *initializerValue = initExpr->GetValue(ctx);
if (initializerValue != NULL)
// Bingo; store the value in the variable's storage
ctx->StoreInst(initializerValue, lvalue);
@@ -380,10 +380,14 @@ DeclStmt::TypeCheck() {
if (dynamic_cast<const AtomicType *>(type) != NULL ||
dynamic_cast<const EnumType *>(type) != NULL) {
// If it's an expr list with an atomic type, we'll later issue
// an error. Need to leave decl->initExpr as is in that case so it
// is in fact caught later, though.
if (dynamic_cast<ExprList *>(vars[i].init) == NULL)
vars[i].init = vars[i].init->TypeConv(type, "initializer");
// an error. Need to leave vars[i].init as is in that case so
// it is in fact caught later, though.
if (dynamic_cast<ExprList *>(vars[i].init) == NULL) {
vars[i].init = TypeConvertExpr(vars[i].init, type,
"initializer");
if (vars[i].init == NULL)
encounteredError = true;
}
}
}
return encounteredError ? NULL : this;