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Only allow exact matches for function overload resolution for builtins.

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The intent is that the code in stdlib.ispc that is calling out to the built-ins
  should match argument types exactly (using explicit casts as needed), just
  for maximal clarity/safety.
This commit is contained in:
Matt Pharr
2011-09-28 17:20:31 -07:00
parent 6d39d5fc3e
commit 32a0a30cf5
5 changed files with 96 additions and 78 deletions
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13
builtins.m4
View File

@@ -647,16 +647,17 @@ forloop(i, 1, eval($1-1), `
define(`global_atomic_associative', `
;; note that the mask is expected to be of type $3, so the caller must ensure
;; that for 64-bit types, the mask is cast to a signed int before being passed
;; to this so that it is properly sign extended... (The code in stdlib.ispc
;; does do this..)
define internal <$1 x $3> @__atomic_$2_$4_global($3 * %ptr, <$1 x $3> %val,
<$1 x $3> %mask) nounwind alwaysinline {
<$1 x i32> %m) nounwind alwaysinline {
; first, for any lanes where the mask is off, compute a vector where those lanes
; hold the identity value..
ifelse($3, `i64', `%mask = sext <$1 x i32> %m to <$1 x i64>')
ifelse($3, `i32', `
%maskmem = alloca <$1 x i32>
store <$1 x i32> %m, <$1 x i32> * %maskmem
%mask = load <$1 x i32> * %maskmem'
)
; zero out any lanes that are off
%valoff = and <$1 x $3> %val, %mask

56
expr.cpp
View File

@@ -1189,7 +1189,7 @@ BinaryExpr::Optimize() {
m->symbolTable->LookupFunction("rcp");
if (rcpFuns != NULL) {
assert(rcpFuns->size() == 2);
Expr *rcpSymExpr = new FunctionSymbolExpr(rcpFuns, pos);
Expr *rcpSymExpr = new FunctionSymbolExpr("rcp", rcpFuns, pos);
ExprList *args = new ExprList(arg1, arg1->pos);
Expr *rcpCall = new FunctionCallExpr(rcpSymExpr, args,
arg1->pos, false);
@@ -2213,7 +2213,7 @@ FunctionCallExpr::tryResolve(bool (*matchFunc)(Expr *, const Type *)) {
void
FunctionCallExpr::resolveFunctionOverloads() {
FunctionCallExpr::resolveFunctionOverloads(bool exactMatchOnly) {
FunctionSymbolExpr *fse = dynamic_cast<FunctionSymbolExpr *>(func);
if (!fse)
// error will be issued later if not calling an actual function
@@ -2227,31 +2227,33 @@ FunctionCallExpr::resolveFunctionOverloads() {
if (tryResolve(lExactMatch))
return;
// Try to find a single match ignoring references
if (tryResolve(lMatchIgnoringReferences))
return;
if (!exactMatchOnly) {
// Try to find a single match ignoring references
if (tryResolve(lMatchIgnoringReferences))
return;
// TODO: next, try to find an exact match via type promotion--i.e. char
// -> int, etc--things that don't lose data
// TODO: next, try to find an exact match via type promotion--i.e. char
// -> int, etc--things that don't lose data
// Next try to see if there's a match via just uniform -> varying
// promotions. TODO: look for one with a minimal number of them?
if (tryResolve(lMatchIgnoringUniform))
return;
// Next try to see if there's a match via just uniform -> varying
// promotions. TODO: look for one with a minimal number of them?
if (tryResolve(lMatchIgnoringUniform))
return;
// Try to find a match via type conversion, but don't change
// unif->varying
if (tryResolve(lMatchWithTypeConvSameVariability))
return;
// Try to find a match via type conversion, but don't change
// unif->varying
if (tryResolve(lMatchWithTypeConvSameVariability))
return;
// Last chance: try to find a match via arbitrary type conversion.
if (tryResolve(lMatchWithTypeConv))
return;
// Last chance: try to find a match via arbitrary type conversion.
if (tryResolve(lMatchWithTypeConv))
return;
}
// failure :-(
const char *funName = fse->candidateFunctions->front()->name.c_str();
Error(pos, "Unable to find matching overload for call to function \"%s\".",
funName);
Error(pos, "Unable to find matching overload for call to function \"%s\"%s.",
funName, exactMatchOnly ? " only considering exact matches" : "");
fprintf(stderr, "Candidates are:\n");
lPrintFunctionOverloads(*fse->candidateFunctions);
lPrintPassedTypes(funName, args->exprs);
@@ -2264,7 +2266,15 @@ FunctionCallExpr::FunctionCallExpr(Expr *f, ExprList *a, SourcePos p, bool il)
args = a;
isLaunch = il;
resolveFunctionOverloads();
FunctionSymbolExpr *fse = dynamic_cast<FunctionSymbolExpr *>(func);
// 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
// those to be matching the argument types exactly; this is to be a bit
// extra safe to be sure that the expected builtin is in fact being
// called.
bool exactMatchOnly = (fse != NULL) && (fse->name.substr(0,2) == "__");
resolveFunctionOverloads(exactMatchOnly);
}
@@ -5201,9 +5211,11 @@ SymbolExpr::Print() const {
///////////////////////////////////////////////////////////////////////////
// FunctionSymbolExpr
FunctionSymbolExpr::FunctionSymbolExpr(std::vector<Symbol *> *candidates,
FunctionSymbolExpr::FunctionSymbolExpr(const char *n,
std::vector<Symbol *> *candidates,
SourcePos p)
: Expr(p) {
name = n;
matchingFunc = NULL;
candidateFunctions = candidates;
}

7
expr.h
View File

@@ -265,7 +265,7 @@ public:
bool isLaunch;
private:
void resolveFunctionOverloads();
void resolveFunctionOverloads(bool exactMatchOnly);
bool tryResolve(bool (*matchFunc)(Expr *, const Type *));
};
@@ -567,7 +567,7 @@ private:
*/
class FunctionSymbolExpr : public Expr {
public:
FunctionSymbolExpr(std::vector<Symbol *> *candidateFunctions,
FunctionSymbolExpr(const char *name, std::vector<Symbol *> *candidateFunctions,
SourcePos pos);
llvm::Value *GetValue(FunctionEmitContext *ctx) const;
@@ -581,6 +581,9 @@ public:
private:
friend class FunctionCallExpr;
/** Name of the function that is being called. */
std::string name;
/** All of the functions with the name given in the function call;
there may be more then one, in which case we need to resolve which
overload is the best match. */

2
parse.yy
View File

@@ -222,7 +222,7 @@ primary_expression
else {
std::vector<Symbol *> *funs = m->symbolTable->LookupFunction(name);
if (funs)
$$ = new FunctionSymbolExpr(funs, @1);
$$ = new FunctionSymbolExpr(name, funs, @1);
}
if ($$ == NULL) {
std::vector<std::string> alternates =

96
stdlib.ispc
View File

@@ -369,7 +369,7 @@ static inline uniform float reduce_min(float v) {
static inline uniform float reduce_max(float v) {
// For the lanes where the mask is off, replace the given value with
// negative infinity, so that it doesn't affect the result.
const uniform int iflt_neg_max = 0xff800000; // -infinity
const int iflt_neg_max = 0xff800000; // -infinity
// Must use __floatbits_varying_int32, not floatbits(), since with the
// latter the current mask enters into the returned result...
return __reduce_max_float(__mask ? v : __floatbits_varying_int32(iflt_neg_max));
@@ -427,7 +427,7 @@ static inline uniform double reduce_min(double v) {
}
static inline uniform double reduce_max(double v) {
const uniform int64 iflt_neg_max = 0xfff0000000000000; // -infinity
const int64 iflt_neg_max = 0xfff0000000000000; // -infinity
// Must use __doublebits_varying_int64, not doublebits(), since with the
// latter the current mask enters into the returned result...
return __reduce_max_double(__mask ? v : __doublebits_varying_int64(iflt_neg_max));
@@ -471,21 +471,21 @@ static inline uniform unsigned int64 reduce_max(unsigned int64 v) {
return __reduce_max_uint64(__mask ? v : 0);
}
#define REDUCE_EQUAL(TYPE, FUNCTYPE) \
#define REDUCE_EQUAL(TYPE, FUNCTYPE, MASKTYPE) \
static inline uniform bool reduce_equal(TYPE v) { \
uniform TYPE unusedValue; \
return __reduce_equal_##FUNCTYPE(v, unusedValue, (int32)__mask); \
return __reduce_equal_##FUNCTYPE(v, unusedValue, (MASKTYPE)__mask); \
} \
static inline uniform bool reduce_equal(TYPE v, reference uniform TYPE value) { \
return __reduce_equal_##FUNCTYPE(v, value, (int32)__mask); \
return __reduce_equal_##FUNCTYPE(v, value, (MASKTYPE)__mask); \
}
REDUCE_EQUAL(int32, int32)
REDUCE_EQUAL(unsigned int32, int32)
REDUCE_EQUAL(float, float)
REDUCE_EQUAL(int64, int64)
REDUCE_EQUAL(unsigned int64, int64)
REDUCE_EQUAL(double, double)
REDUCE_EQUAL(int32, int32, int32)
REDUCE_EQUAL(unsigned int32, int32, unsigned int32)
REDUCE_EQUAL(float, float, int32)
REDUCE_EQUAL(int64, int64, int32)
REDUCE_EQUAL(unsigned int64, int64, unsigned int32)
REDUCE_EQUAL(double, double, int32)
static int32 exclusive_scan_add(int32 v) {
return __exclusive_scan_add_i32(v, (int32)__mask);
@@ -549,23 +549,25 @@ static unsigned int64 exclusive_scan_or(unsigned int64 v) {
static inline uniform int
packed_load_active(uniform unsigned int a[], uniform int start,
reference unsigned int vals) {
return __packed_load_active(a, start, vals, __mask);
return __packed_load_active(a, (unsigned int)start, vals,
(unsigned int32)__mask);
}
static inline uniform int
packed_store_active(uniform unsigned int a[], uniform int start,
unsigned int vals) {
return __packed_store_active(a, start, vals, __mask);
return __packed_store_active(a, (unsigned int)start, vals,
(unsigned int32)__mask);
}
static inline uniform int packed_load_active(uniform int a[], uniform int start,
reference int vals) {
return __packed_load_active(a, start, vals, __mask);
return __packed_load_active(a, start, vals, (int32)__mask);
}
static inline uniform int packed_store_active(uniform int a[], uniform int start,
int vals) {
return __packed_store_active(a, start, vals, __mask);
return __packed_store_active(a, start, vals, (int32)__mask);
}
///////////////////////////////////////////////////////////////////////////
@@ -597,13 +599,13 @@ static inline uniform TA atomic_##OPA##_global(uniform reference TA ref, \
return ret; \
}
#define DEFINE_ATOMIC_MINMAX_OP(TA,TB,OPA,OPB) \
#define DEFINE_ATOMIC_MINMAX_OP(TA,TB,OPA,OPB, MASKTYPE) \
static inline TA atomic_##OPA##_global(uniform reference TA ref, TA value) { \
uniform TA oneval = reduce_##OPA(value); \
TA ret; \
if (lanemask() != 0) { \
memory_barrier(); \
ret = __atomic_##OPB##_uniform_##TB##_global(ref, oneval, __mask); \
ret = __atomic_##OPB##_uniform_##TB##_global(ref, oneval, (MASKTYPE)__mask); \
memory_barrier(); \
} \
return ret; \
@@ -611,15 +613,15 @@ static inline TA atomic_##OPA##_global(uniform reference TA ref, TA value) { \
static inline uniform TA atomic_##OPA##_global(uniform reference TA ref, \
uniform TA value) { \
memory_barrier(); \
uniform TA ret = __atomic_##OPB##_uniform_##TB##_global(ref, value, __mask); \
uniform TA ret = __atomic_##OPB##_uniform_##TB##_global(ref, value, (MASKTYPE)__mask); \
memory_barrier(); \
return ret; \
}
DEFINE_ATOMIC_OP(int32,int32,add,add,int32)
DEFINE_ATOMIC_OP(int32,int32,subtract,sub,int32)
DEFINE_ATOMIC_MINMAX_OP(int32,int32,min,min)
DEFINE_ATOMIC_MINMAX_OP(int32,int32,max,max)
DEFINE_ATOMIC_MINMAX_OP(int32,int32,min,min,int32)
DEFINE_ATOMIC_MINMAX_OP(int32,int32,max,max,int32)
DEFINE_ATOMIC_OP(int32,int32,and,and,int32)
DEFINE_ATOMIC_OP(int32,int32,or,or,int32)
DEFINE_ATOMIC_OP(int32,int32,xor,xor,int32)
@@ -627,21 +629,21 @@ DEFINE_ATOMIC_OP(int32,int32,swap,swap,int32)
// For everything but atomic min and max, we can use the same
// implementations for unsigned as for signed.
DEFINE_ATOMIC_OP(unsigned int32,int32,add,add,int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,subtract,sub,int32)
DEFINE_ATOMIC_MINMAX_OP(unsigned int32,uint32,min,umin)
DEFINE_ATOMIC_MINMAX_OP(unsigned int32,uint32,max,umax)
DEFINE_ATOMIC_OP(unsigned int32,int32,and,and,int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,or,or,int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,xor,xor,int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,swap,swap,int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,add,add,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,subtract,sub,unsigned int32)
DEFINE_ATOMIC_MINMAX_OP(unsigned int32,uint32,min,umin,unsigned int32)
DEFINE_ATOMIC_MINMAX_OP(unsigned int32,uint32,max,umax,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,and,and,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,or,or,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,xor,xor,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int32,int32,swap,swap,unsigned int32)
DEFINE_ATOMIC_OP(float,float,swap,swap,int32)
DEFINE_ATOMIC_OP(int64,int64,add,add,int32)
DEFINE_ATOMIC_OP(int64,int64,subtract,sub,int32)
DEFINE_ATOMIC_MINMAX_OP(int64,int64,min,min)
DEFINE_ATOMIC_MINMAX_OP(int64,int64,max,max)
DEFINE_ATOMIC_MINMAX_OP(int64,int64,min,min,int32)
DEFINE_ATOMIC_MINMAX_OP(int64,int64,max,max,int32)
DEFINE_ATOMIC_OP(int64,int64,and,and,int32)
DEFINE_ATOMIC_OP(int64,int64,or,or,int32)
DEFINE_ATOMIC_OP(int64,int64,xor,xor,int32)
@@ -649,41 +651,41 @@ DEFINE_ATOMIC_OP(int64,int64,swap,swap,int32)
// For everything but atomic min and max, we can use the same
// implementations for unsigned as for signed.
DEFINE_ATOMIC_OP(unsigned int64,int64,add,add,int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,subtract,sub,int32)
DEFINE_ATOMIC_MINMAX_OP(unsigned int64,uint64,min,umin)
DEFINE_ATOMIC_MINMAX_OP(unsigned int64,uint64,max,umax)
DEFINE_ATOMIC_OP(unsigned int64,int64,and,and,int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,or,or,int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,xor,xor,int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,swap,swap,int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,add,add,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,subtract,sub,unsigned int32)
DEFINE_ATOMIC_MINMAX_OP(unsigned int64,uint64,min,umin,unsigned int32)
DEFINE_ATOMIC_MINMAX_OP(unsigned int64,uint64,max,umax,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,and,and,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,or,or,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,xor,xor,unsigned int32)
DEFINE_ATOMIC_OP(unsigned int64,int64,swap,swap,unsigned int32)
DEFINE_ATOMIC_OP(double,double,swap,swap,int32)
#undef DEFINE_ATOMIC_OP
#define ATOMIC_DECL_CMPXCHG(TA, TB) \
#define ATOMIC_DECL_CMPXCHG(TA, TB, MASKTYPE) \
static inline TA atomic_compare_exchange_global( \
uniform reference TA ref, TA oldval, TA newval) { \
memory_barrier(); \
TA ret = __atomic_compare_exchange_##TB##_global(ref, oldval, newval, __mask); \
TA ret = __atomic_compare_exchange_##TB##_global(ref, oldval, newval, (MASKTYPE)__mask); \
memory_barrier(); \
return ret; \
} \
static inline uniform TA atomic_compare_exchange_global( \
uniform reference TA ref, uniform TA oldval, uniform TA newval) { \
memory_barrier(); \
uniform TA ret = __atomic_compare_exchange_uniform_##TB##_global(ref, oldval, newval, __mask); \
uniform TA ret = __atomic_compare_exchange_uniform_##TB##_global(ref, oldval, newval, (MASKTYPE)__mask); \
memory_barrier(); \
return ret; \
}
ATOMIC_DECL_CMPXCHG(int32, int32)
ATOMIC_DECL_CMPXCHG(unsigned int32, int32)
ATOMIC_DECL_CMPXCHG(float, float)
ATOMIC_DECL_CMPXCHG(int64, int64)
ATOMIC_DECL_CMPXCHG(unsigned int64, int64)
ATOMIC_DECL_CMPXCHG(double, double)
ATOMIC_DECL_CMPXCHG(int32, int32, int32)
ATOMIC_DECL_CMPXCHG(unsigned int32, int32, unsigned int32)
ATOMIC_DECL_CMPXCHG(float, float, int32)
ATOMIC_DECL_CMPXCHG(int64, int64, int32)
ATOMIC_DECL_CMPXCHG(unsigned int64, int64, unsigned int32)
ATOMIC_DECL_CMPXCHG(double, double, int32)
#undef ATOMIC_DECL_CMPXCHG