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Handle buffer references vs 'const'

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Allow constructors to and from references to be constant folded. Section 4.3.3
says constructors whose arguments are all constant expressions must fold.

Disallow 'const' on buffer reference types. It is not a 'non-void transparent
basic data type' (it is not considered 'basic').

Handle buffer reference constants (which can be assigned to a non-const reference,
or can be further folded to another type of constant) by converting to
'constructor(uint64_t constant)' in addConversion.

Disallow == and != operators on reference types.
This commit is contained in:
Jeff Bolz 2019-02-18 00:11:05 -06:00
parent d90d548161
commit be63facd80
13 changed files with 1271 additions and 1099 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
Test/baseResults/spv.bufferhandle16.frag.out Normal file
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@ -0,0 +1,76 @@
spv.bufferhandle16.frag
// Module Version 10000
// Generated by (magic number): 80007
// Id's are bound by 37
Capability Shader
Capability Int64
Capability CapabilityPhysicalStorageBufferAddressesEXT
Extension "SPV_EXT_physical_storage_buffer"
1: ExtInstImport "GLSL.std.450"
MemoryModel PhysicalStorageBuffer64EXT GLSL450
EntryPoint Fragment 4 "main"
ExecutionMode 4 OriginUpperLeft
Source GLSL 450
SourceExtension "GL_EXT_buffer_reference"
SourceExtension "GL_EXT_scalar_block_layout"
SourceExtension "GL_EXT_shader_explicit_arithmetic_types_int64"
Name 4 "main"
Name 8 "T1"
MemberName 8(T1) 0 "x"
Name 10 "a"
Name 14 "b"
Name 17 "c"
Name 23 "d"
Name 25 "e"
Name 36 "x"
MemberDecorate 8(T1) 0 Offset 0
Decorate 8(T1) Block
Decorate 10(a) DecorationAliasedPointerEXT
Decorate 14(b) DecorationAliasedPointerEXT
Decorate 17(c) DecorationAliasedPointerEXT
Decorate 23(d) DecorationAliasedPointerEXT
Decorate 25(e) DecorationAliasedPointerEXT
2: TypeVoid
3: TypeFunction 2
TypeForwardPointer 6 PhysicalStorageBufferEXT
7: TypeInt 32 1
8(T1): TypeStruct 7(int)
6: TypePointer PhysicalStorageBufferEXT 8(T1)
9: TypePointer Function 6(ptr)
11: TypeInt 64 0
12: 11(int64_t) Constant 4 0
15: 11(int64_t) Constant 5 0
18: TypeBool
19: 18(bool) ConstantTrue
26: 11(int64_t) Constant 6 0
28: 11(int64_t) Constant 7 0
31: 7(int) Constant 3
32: TypeInt 32 0
33: 32(int) Constant 3
34: TypeArray 7(int) 33
35: TypePointer Private 34
36(x): 35(ptr) Variable Private
4(main): 2 Function None 3
5: Label
10(a): 9(ptr) Variable Function
14(b): 9(ptr) Variable Function
17(c): 9(ptr) Variable Function
23(d): 9(ptr) Variable Function
25(e): 9(ptr) Variable Function
13: 6(ptr) Bitcast 12
Store 10(a) 13
16: 6(ptr) Bitcast 15
Store 14(b) 16
20: 6(ptr) Load 10(a)
21: 6(ptr) Load 14(b)
22: 6(ptr) Select 19 20 21
Store 17(c) 22
24: 6(ptr) Load 14(b)
Store 23(d) 24
27: 6(ptr) Bitcast 26
29: 6(ptr) Bitcast 28
30: 6(ptr) Select 19 27 29
Store 25(e) 30
Return
FunctionEnd

9
Test/baseResults/spv.bufferhandle17_Errors.frag.out Normal file
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@ -0,0 +1,9 @@
spv.bufferhandle17_Errors.frag
ERROR: 0:11: 'qualifier' : variables with reference type can't have qualifier 'const'
ERROR: 0:16: 'qualifier' : variables with reference type can't have qualifier 'const'
ERROR: 0:18: '==' : can't use with reference types
ERROR: 0:19: '!=' : can't use with reference types
ERROR: 4 compilation errors. No code generated.
SPIR-V is not generated for failed compile or link

23
Test/spv.bufferhandle16.frag Normal file
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@ -0,0 +1,23 @@
#version 450
#extension GL_EXT_shader_explicit_arithmetic_types_int64 : enable
#extension GL_EXT_buffer_reference : enable
#extension GL_EXT_scalar_block_layout : enable
layout(buffer_reference) buffer T1 {
int x;
};
layout(buffer_reference) buffer T2 {
int x;
};
const int s = int(uint64_t(T1(T2(uint64_t(3)))));
int x[s];
void main()
{
T1 a = T1(uint64_t(4)), b = T1(uint64_t(5));
T1 c = true ? a : b;
T1 d = (a,b);
T1 e = true ? T1(uint64_t(6)) : T1(uint64_t(7));
}

20
Test/spv.bufferhandle17_Errors.frag Normal file
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@ -0,0 +1,20 @@
#version 450
#extension GL_EXT_shader_explicit_arithmetic_types_int64 : enable
#extension GL_EXT_buffer_reference : enable
#extension GL_EXT_scalar_block_layout : enable
layout(buffer_reference) buffer T1 {
int x;
};
const T1 a = T1(uint64_t(2));
void main()
{
T1 b, c;
const T1 d = b;
b == c;
b != c;
}

1
glslang/Include/Types.h
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@ -1628,6 +1628,7 @@ public:
case EbtInt64:
case EbtUint64:
case EbtBool:
case EbtReference:
return true;
default:
return false;

4
glslang/MachineIndependent/Constant.cpp
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@ -941,6 +941,10 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TType& returnType)
newConstArray[i].setDConst(unionArray[i].getDConst()); break;
case EOpConvDoubleToFloat:
newConstArray[i].setDConst(unionArray[i].getDConst()); break;
case EOpConvPtrToUint64:
case EOpConvUint64ToPtr:
case EOpConstructReference:
newConstArray[i].setU64Const(unionArray[i].getU64Const()); break;

22
glslang/MachineIndependent/Intermediate.cpp
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@ -725,6 +725,19 @@ TIntermTyped* TIntermediate::createConversion(TBasicType convertTo, TIntermTyped
return newNode;
}
// Convert a constant that is a reference type to a uint64_t constant plus a
// constructor instruction. This is needed because SPIR-V doesn't support
// OpConstant on pointer types.
TIntermTyped* TIntermediate::addConstantReferenceConversion(TIntermTyped* node)
{
if (node->getType().getBasicType() == EbtReference && node->getAsConstantUnion()) {
const TType &type = node->getType();
node = addBuiltInFunctionCall(node->getLoc(), EOpConvPtrToUint64, true, node, TType(EbtUint64));
node = addUnaryNode(EOpConstructReference, node, node->getLoc(), type);
}
return node;
}
TIntermTyped* TIntermediate::addConversion(TBasicType convertTo, TIntermTyped* node) const
{
return createConversion(convertTo, node);
@ -743,7 +756,7 @@ TIntermTyped* TIntermediate::addConversion(TBasicType convertTo, TIntermTyped* n
// Returns the converted pair of nodes.
// Returns <nullptr, nullptr> when there is no conversion.
std::tuple<TIntermTyped*, TIntermTyped*>
TIntermediate::addConversion(TOperator op, TIntermTyped* node0, TIntermTyped* node1) const
TIntermediate::addConversion(TOperator op, TIntermTyped* node0, TIntermTyped* node1)
{
if (!isConversionAllowed(op, node0) || !isConversionAllowed(op, node1))
return std::make_tuple(nullptr, nullptr);
@ -762,6 +775,9 @@ TIntermediate::addConversion(TOperator op, TIntermTyped* node0, TIntermTyped* no
return std::make_tuple(node0, node1);
}
node0 = addConstantReferenceConversion(node0);
node1 = addConstantReferenceConversion(node1);
auto promoteTo = std::make_tuple(EbtNumTypes, EbtNumTypes);
switch (op) {
@ -876,11 +892,13 @@ TIntermediate::addConversion(TOperator op, TIntermTyped* node0, TIntermTyped* no
//
// Return nullptr if a conversion can't be done.
//
TIntermTyped* TIntermediate::addConversion(TOperator op, const TType& type, TIntermTyped* node) const
TIntermTyped* TIntermediate::addConversion(TOperator op, const TType& type, TIntermTyped* node)
{
if (!isConversionAllowed(op, node))
return nullptr;
node = addConstantReferenceConversion(node);
// Otherwise, if types are identical, no problem
if (type == node->getType())
return node;

21
glslang/MachineIndependent/ParseHelper.cpp
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@ -4435,6 +4435,12 @@ void TParseContext::opaqueCheck(const TSourceLoc& loc, const TType& type, const
error(loc, "can't use with samplers or structs containing samplers", op, "");
}
void TParseContext::referenceCheck(const TSourceLoc& loc, const TType& type, const char* op)
{
if (containsFieldWithBasicType(type, EbtReference))
error(loc, "can't use with reference types", op, "");
}
void TParseContext::storage16BitAssignmentCheck(const TSourceLoc& loc, const TType& type, const char* op)
{
if (type.getBasicType() == EbtStruct && containsFieldWithBasicType(type, EbtFloat16))
@ -6290,6 +6296,9 @@ TIntermNode* TParseContext::declareVariable(const TSourceLoc& loc, TString& iden
#ifdef NV_EXTENSIONS
accStructNVCheck(loc, type, identifier);
#endif
if (type.getQualifier().storage == EvqConst && type.containsBasicType(EbtReference)) {
error(loc, "variables with reference type can't have qualifier 'const'", "qualifier", "");
}
if (type.getQualifier().storage != EvqUniform && type.getQualifier().storage != EvqBuffer) {
if (type.containsBasicType(EbtFloat16))
@ -6518,7 +6527,11 @@ TIntermNode* TParseContext::executeInitializer(const TSourceLoc& loc, TIntermTyp
// We either have a folded constant in getAsConstantUnion, or we have to use
// the initializer's subtree in the AST to represent the computation of a
// specialization constant.
assert(initializer->getAsConstantUnion() || initializer->getType().getQualifier().isSpecConstant());
// A third case arises when a reference type is made non-constant due to
// addConstantReferenceConversion, but reference types can't be const, so
// this is an error.
assert(initializer->getAsConstantUnion() || initializer->getType().getQualifier().isSpecConstant() ||
initializer->getType().getBasicType() == EbtReference);
if (initializer->getAsConstantUnion())
variable->setConstArray(initializer->getAsConstantUnion()->getConstArray());
else {
@ -6860,7 +6873,7 @@ TIntermTyped* TParseContext::constructBuiltIn(const TType& type, TOperator op, T
case EOpConstructUint64:
if (type.isScalar() && node->getType().getBasicType() == EbtReference) {
TIntermUnary* newNode = intermediate.addUnaryNode(EOpConvPtrToUint64, node, node->getLoc(), type);
TIntermTyped* newNode = intermediate.addBuiltInFunctionCall(node->getLoc(), EOpConvPtrToUint64, true, node, type);
return newNode;
}
// fall through
@ -6885,11 +6898,11 @@ TIntermTyped* TParseContext::constructBuiltIn(const TType& type, TOperator op, T
case EOpConstructReference:
// construct reference from reference
if (node->getType().getBasicType() == EbtReference) {
newNode = intermediate.addUnaryNode(EOpConstructReference, node, node->getLoc(), type);
newNode = intermediate.addBuiltInFunctionCall(node->getLoc(), EOpConstructReference, true, node, type);
return newNode;
// construct reference from uint64
} else if (node->getType().isScalar() && node->getType().getBasicType() == EbtUint64) {
TIntermUnary* newNode = intermediate.addUnaryNode(EOpConvUint64ToPtr, node, node->getLoc(), type);
TIntermTyped* newNode = intermediate.addBuiltInFunctionCall(node->getLoc(), EOpConvUint64ToPtr, true, node, type);
return newNode;
} else {
return nullptr;

1
glslang/MachineIndependent/ParseHelper.h
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@ -370,6 +370,7 @@ public:
void nestedStructCheck(const TSourceLoc&);
void arrayObjectCheck(const TSourceLoc&, const TType&, const char* op);
void opaqueCheck(const TSourceLoc&, const TType&, const char* op);
void referenceCheck(const TSourceLoc&, const TType&, const char* op);
void storage16BitAssignmentCheck(const TSourceLoc&, const TType&, const char* op);
void specializationCheck(const TSourceLoc&, const TType&, const char* op);
void structTypeCheck(const TSourceLoc&, TPublicType&);

2
glslang/MachineIndependent/glslang.y
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@ -613,6 +613,7 @@ equality_expression
parseContext.arrayObjectCheck($2.loc, $1->getType(), "array comparison");
parseContext.opaqueCheck($2.loc, $1->getType(), "==");
parseContext.specializationCheck($2.loc, $1->getType(), "==");
parseContext.referenceCheck($2.loc, $1->getType(), "==");
$$ = parseContext.handleBinaryMath($2.loc, "==", EOpEqual, $1, $3);
if ($$ == 0)
$$ = parseContext.intermediate.addConstantUnion(false, $2.loc);
@ -621,6 +622,7 @@ equality_expression
parseContext.arrayObjectCheck($2.loc, $1->getType(), "array comparison");
parseContext.opaqueCheck($2.loc, $1->getType(), "!=");
parseContext.specializationCheck($2.loc, $1->getType(), "!=");
parseContext.referenceCheck($2.loc, $1->getType(), "!=");
$$ = parseContext.handleBinaryMath($2.loc, "!=", EOpNotEqual, $1, $3);
if ($$ == 0)
$$ = parseContext.intermediate.addConstantUnion(false, $2.loc);

2184
glslang/MachineIndependent/glslang_tab.cpp
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File diff suppressed because it is too large Load Diff

5
glslang/MachineIndependent/localintermediate.h Executable file → Normal file
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@ -495,12 +495,13 @@ public:
TIntermSymbol* addSymbol(const TVariable&, const TSourceLoc&);
TIntermSymbol* addSymbol(const TType&, const TSourceLoc&);
TIntermSymbol* addSymbol(const TIntermSymbol&);
TIntermTyped* addConversion(TOperator, const TType&, TIntermTyped*) const;
std::tuple<TIntermTyped*, TIntermTyped*> addConversion(TOperator op, TIntermTyped* node0, TIntermTyped* node1) const;
TIntermTyped* addConversion(TOperator, const TType&, TIntermTyped*);
std::tuple<TIntermTyped*, TIntermTyped*> addConversion(TOperator op, TIntermTyped* node0, TIntermTyped* node1);
TIntermTyped* addUniShapeConversion(TOperator, const TType&, TIntermTyped*);
TIntermTyped* addConversion(TBasicType convertTo, TIntermTyped* node) const;
void addBiShapeConversion(TOperator, TIntermTyped*& lhsNode, TIntermTyped*& rhsNode);
TIntermTyped* addShapeConversion(const TType&, TIntermTyped*);
TIntermTyped* addConstantReferenceConversion(TIntermTyped* node);
TIntermTyped* addBinaryMath(TOperator, TIntermTyped* left, TIntermTyped* right, TSourceLoc);
TIntermTyped* addAssign(TOperator op, TIntermTyped* left, TIntermTyped* right, TSourceLoc);
TIntermTyped* addIndex(TOperator op, TIntermTyped* base, TIntermTyped* index, TSourceLoc);

2
gtests/Spv.FromFile.cpp
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@ -272,6 +272,8 @@ INSTANTIATE_TEST_CASE_P(
"spv.bufferhandle13.frag",
"spv.bufferhandle14.frag",
"spv.bufferhandle15.frag",
"spv.bufferhandle16.frag",
"spv.bufferhandle17_Errors.frag",
"spv.bufferhandle2.frag",
"spv.bufferhandle3.frag",
"spv.bufferhandle4.frag",