blob: 7777f989f18b880157c54069c2399e862bf032c9 [file] [log] [blame]
//
// Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#include "compiler/translator/ParseContext.h"
#include <stdarg.h>
#include <stdio.h>
#include "compiler/preprocessor/SourceLocation.h"
#include "compiler/translator/Cache.h"
#include "compiler/translator/glslang.h"
#include "compiler/translator/ValidateSwitch.h"
#include "compiler/translator/ValidateGlobalInitializer.h"
#include "compiler/translator/util.h"
namespace sh
{
///////////////////////////////////////////////////////////////////////
//
// Sub- vector and matrix fields
//
////////////////////////////////////////////////////////////////////////
namespace
{
const int kWebGLMaxStructNesting = 4;
bool ContainsSampler(const TType &type)
{
if (IsSampler(type.getBasicType()))
return true;
if (type.getBasicType() == EbtStruct)
{
const TFieldList &fields = type.getStruct()->fields();
for (unsigned int i = 0; i < fields.size(); ++i)
{
if (ContainsSampler(*fields[i]->type()))
return true;
}
}
return false;
}
// Get a token from an image argument to use as an error message token.
const char *GetImageArgumentToken(TIntermTyped *imageNode)
{
ASSERT(IsImage(imageNode->getBasicType()));
while (imageNode->getAsBinaryNode() &&
(imageNode->getAsBinaryNode()->getOp() == EOpIndexIndirect ||
imageNode->getAsBinaryNode()->getOp() == EOpIndexDirect))
{
imageNode = imageNode->getAsBinaryNode()->getLeft();
}
TIntermSymbol *imageSymbol = imageNode->getAsSymbolNode();
if (imageSymbol)
{
return imageSymbol->getSymbol().c_str();
}
return "image";
}
} // namespace
TParseContext::TParseContext(TSymbolTable &symt,
TExtensionBehavior &ext,
sh::GLenum type,
ShShaderSpec spec,
ShCompileOptions options,
bool checksPrecErrors,
TDiagnostics *diagnostics,
const ShBuiltInResources &resources)
: intermediate(),
symbolTable(symt),
mDeferredNonEmptyDeclarationErrorCheck(false),
mShaderType(type),
mShaderSpec(spec),
mCompileOptions(options),
mShaderVersion(100),
mTreeRoot(nullptr),
mLoopNestingLevel(0),
mStructNestingLevel(0),
mSwitchNestingLevel(0),
mCurrentFunctionType(nullptr),
mFunctionReturnsValue(false),
mChecksPrecisionErrors(checksPrecErrors),
mFragmentPrecisionHighOnESSL1(false),
mDefaultMatrixPacking(EmpColumnMajor),
mDefaultBlockStorage(sh::IsWebGLBasedSpec(spec) ? EbsStd140 : EbsShared),
mDiagnostics(diagnostics),
mDirectiveHandler(ext,
*mDiagnostics,
mShaderVersion,
mShaderType,
resources.WEBGL_debug_shader_precision == 1),
mPreprocessor(mDiagnostics, &mDirectiveHandler, pp::PreprocessorSettings()),
mScanner(nullptr),
mUsesFragData(false),
mUsesFragColor(false),
mUsesSecondaryOutputs(false),
mMinProgramTexelOffset(resources.MinProgramTexelOffset),
mMaxProgramTexelOffset(resources.MaxProgramTexelOffset),
mMultiviewAvailable(resources.OVR_multiview == 1),
mComputeShaderLocalSizeDeclared(false),
mNumViews(-1),
mMaxNumViews(resources.MaxViewsOVR),
mMaxImageUnits(resources.MaxImageUnits),
mMaxCombinedTextureImageUnits(resources.MaxCombinedTextureImageUnits),
mMaxUniformLocations(resources.MaxUniformLocations),
mDeclaringFunction(false)
{
mComputeShaderLocalSize.fill(-1);
}
//
// Look at a '.' field selector string and change it into offsets
// for a vector.
//
bool TParseContext::parseVectorFields(const TString &compString,
int vecSize,
TVectorFields &fields,
const TSourceLoc &line)
{
fields.num = (int)compString.size();
if (fields.num > 4)
{
error(line, "illegal vector field selection", compString.c_str());
return false;
}
enum
{
exyzw,
ergba,
estpq
} fieldSet[4];
for (int i = 0; i < fields.num; ++i)
{
switch (compString[i])
{
case 'x':
fields.offsets[i] = 0;
fieldSet[i] = exyzw;
break;
case 'r':
fields.offsets[i] = 0;
fieldSet[i] = ergba;
break;
case 's':
fields.offsets[i] = 0;
fieldSet[i] = estpq;
break;
case 'y':
fields.offsets[i] = 1;
fieldSet[i] = exyzw;
break;
case 'g':
fields.offsets[i] = 1;
fieldSet[i] = ergba;
break;
case 't':
fields.offsets[i] = 1;
fieldSet[i] = estpq;
break;
case 'z':
fields.offsets[i] = 2;
fieldSet[i] = exyzw;
break;
case 'b':
fields.offsets[i] = 2;
fieldSet[i] = ergba;
break;
case 'p':
fields.offsets[i] = 2;
fieldSet[i] = estpq;
break;
case 'w':
fields.offsets[i] = 3;
fieldSet[i] = exyzw;
break;
case 'a':
fields.offsets[i] = 3;
fieldSet[i] = ergba;
break;
case 'q':
fields.offsets[i] = 3;
fieldSet[i] = estpq;
break;
default:
error(line, "illegal vector field selection", compString.c_str());
return false;
}
}
for (int i = 0; i < fields.num; ++i)
{
if (fields.offsets[i] >= vecSize)
{
error(line, "vector field selection out of range", compString.c_str());
return false;
}
if (i > 0)
{
if (fieldSet[i] != fieldSet[i - 1])
{
error(line, "illegal - vector component fields not from the same set",
compString.c_str());
return false;
}
}
}
return true;
}
///////////////////////////////////////////////////////////////////////
//
// Errors
//
////////////////////////////////////////////////////////////////////////
//
// Used by flex/bison to output all syntax and parsing errors.
//
void TParseContext::error(const TSourceLoc &loc, const char *reason, const char *token)
{
mDiagnostics->error(loc, reason, token);
}
void TParseContext::warning(const TSourceLoc &loc, const char *reason, const char *token)
{
mDiagnostics->warning(loc, reason, token);
}
void TParseContext::outOfRangeError(bool isError,
const TSourceLoc &loc,
const char *reason,
const char *token)
{
if (isError)
{
error(loc, reason, token);
}
else
{
warning(loc, reason, token);
}
}
//
// Same error message for all places assignments don't work.
//
void TParseContext::assignError(const TSourceLoc &line, const char *op, TString left, TString right)
{
std::stringstream reasonStream;
reasonStream << "cannot convert from '" << right << "' to '" << left << "'";
std::string reason = reasonStream.str();
error(line, reason.c_str(), op);
}
//
// Same error message for all places unary operations don't work.
//
void TParseContext::unaryOpError(const TSourceLoc &line, const char *op, TString operand)
{
std::stringstream reasonStream;
reasonStream << "wrong operand type - no operation '" << op
<< "' exists that takes an operand of type " << operand
<< " (or there is no acceptable conversion)";
std::string reason = reasonStream.str();
error(line, reason.c_str(), op);
}
//
// Same error message for all binary operations don't work.
//
void TParseContext::binaryOpError(const TSourceLoc &line,
const char *op,
TString left,
TString right)
{
std::stringstream reasonStream;
reasonStream << "wrong operand types - no operation '" << op
<< "' exists that takes a left-hand operand of type '" << left
<< "' and a right operand of type '" << right
<< "' (or there is no acceptable conversion)";
std::string reason = reasonStream.str();
error(line, reason.c_str(), op);
}
void TParseContext::checkPrecisionSpecified(const TSourceLoc &line,
TPrecision precision,
TBasicType type)
{
if (!mChecksPrecisionErrors)
return;
if (precision != EbpUndefined && !SupportsPrecision(type))
{
error(line, "illegal type for precision qualifier", getBasicString(type));
}
if (precision == EbpUndefined)
{
switch (type)
{
case EbtFloat:
error(line, "No precision specified for (float)", "");
return;
case EbtInt:
case EbtUInt:
UNREACHABLE(); // there's always a predeclared qualifier
error(line, "No precision specified (int)", "");
return;
default:
if (IsOpaqueType(type))
{
error(line, "No precision specified", getBasicString(type));
return;
}
}
}
}
// Both test and if necessary, spit out an error, to see if the node is really
// an l-value that can be operated on this way.
bool TParseContext::checkCanBeLValue(const TSourceLoc &line, const char *op, TIntermTyped *node)
{
TIntermSymbol *symNode = node->getAsSymbolNode();
TIntermBinary *binaryNode = node->getAsBinaryNode();
TIntermSwizzle *swizzleNode = node->getAsSwizzleNode();
if (swizzleNode)
{
bool ok = checkCanBeLValue(line, op, swizzleNode->getOperand());
if (ok && swizzleNode->hasDuplicateOffsets())
{
error(line, " l-value of swizzle cannot have duplicate components", op);
return false;
}
return ok;
}
if (binaryNode)
{
switch (binaryNode->getOp())
{
case EOpIndexDirect:
case EOpIndexIndirect:
case EOpIndexDirectStruct:
case EOpIndexDirectInterfaceBlock:
return checkCanBeLValue(line, op, binaryNode->getLeft());
default:
break;
}
error(line, " l-value required", op);
return false;
}
std::string message;
switch (node->getQualifier())
{
case EvqConst:
message = "can't modify a const";
break;
case EvqConstReadOnly:
message = "can't modify a const";
break;
case EvqAttribute:
message = "can't modify an attribute";
break;
case EvqFragmentIn:
message = "can't modify an input";
break;
case EvqVertexIn:
message = "can't modify an input";
break;
case EvqUniform:
message = "can't modify a uniform";
break;
case EvqVaryingIn:
message = "can't modify a varying";
break;
case EvqFragCoord:
message = "can't modify gl_FragCoord";
break;
case EvqFrontFacing:
message = "can't modify gl_FrontFacing";
break;
case EvqPointCoord:
message = "can't modify gl_PointCoord";
break;
case EvqNumWorkGroups:
message = "can't modify gl_NumWorkGroups";
break;
case EvqWorkGroupSize:
message = "can't modify gl_WorkGroupSize";
break;
case EvqWorkGroupID:
message = "can't modify gl_WorkGroupID";
break;
case EvqLocalInvocationID:
message = "can't modify gl_LocalInvocationID";
break;
case EvqGlobalInvocationID:
message = "can't modify gl_GlobalInvocationID";
break;
case EvqLocalInvocationIndex:
message = "can't modify gl_LocalInvocationIndex";
break;
case EvqViewIDOVR:
message = "can't modify gl_ViewID_OVR";
break;
case EvqComputeIn:
message = "can't modify work group size variable";
break;
default:
//
// Type that can't be written to?
//
if (node->getBasicType() == EbtVoid)
{
message = "can't modify void";
}
if (IsOpaqueType(node->getBasicType()))
{
message = "can't modify a variable with type ";
message += getBasicString(node->getBasicType());
}
}
if (message.empty() && binaryNode == 0 && symNode == 0)
{
error(line, "l-value required", op);
return false;
}
//
// Everything else is okay, no error.
//
if (message.empty())
return true;
//
// If we get here, we have an error and a message.
//
if (symNode)
{
const char *symbol = symNode->getSymbol().c_str();
std::stringstream reasonStream;
reasonStream << "l-value required (" << message << " \"" << symbol << "\")";
std::string reason = reasonStream.str();
error(line, reason.c_str(), op);
}
else
{
std::stringstream reasonStream;
reasonStream << "l-value required (" << message << ")";
std::string reason = reasonStream.str();
error(line, reason.c_str(), op);
}
return false;
}
// Both test, and if necessary spit out an error, to see if the node is really
// a constant.
void TParseContext::checkIsConst(TIntermTyped *node)
{
if (node->getQualifier() != EvqConst)
{
error(node->getLine(), "constant expression required", "");
}
}
// Both test, and if necessary spit out an error, to see if the node is really
// an integer.
void TParseContext::checkIsScalarInteger(TIntermTyped *node, const char *token)
{
if (!node->isScalarInt())
{
error(node->getLine(), "integer expression required", token);
}
}
// Both test, and if necessary spit out an error, to see if we are currently
// globally scoped.
bool TParseContext::checkIsAtGlobalLevel(const TSourceLoc &line, const char *token)
{
if (!symbolTable.atGlobalLevel())
{
error(line, "only allowed at global scope", token);
return false;
}
return true;
}
// For now, keep it simple: if it starts "gl_", it's reserved, independent
// of scope. Except, if the symbol table is at the built-in push-level,
// which is when we are parsing built-ins.
// Also checks for "webgl_" and "_webgl_" reserved identifiers if parsing a
// webgl shader.
bool TParseContext::checkIsNotReserved(const TSourceLoc &line, const TString &identifier)
{
static const char *reservedErrMsg = "reserved built-in name";
if (!symbolTable.atBuiltInLevel())
{
if (identifier.compare(0, 3, "gl_") == 0)
{
error(line, reservedErrMsg, "gl_");
return false;
}
if (sh::IsWebGLBasedSpec(mShaderSpec))
{
if (identifier.compare(0, 6, "webgl_") == 0)
{
error(line, reservedErrMsg, "webgl_");
return false;
}
if (identifier.compare(0, 7, "_webgl_") == 0)
{
error(line, reservedErrMsg, "_webgl_");
return false;
}
}
if (identifier.find("__") != TString::npos)
{
error(line,
"identifiers containing two consecutive underscores (__) are reserved as "
"possible future keywords",
identifier.c_str());
return false;
}
}
return true;
}
// Make sure the argument types are correct for constructing a specific type.
bool TParseContext::checkConstructorArguments(const TSourceLoc &line,
const TIntermSequence *arguments,
const TType &type)
{
if (arguments->empty())
{
error(line, "constructor does not have any arguments", "constructor");
return false;
}
for (TIntermNode *arg : *arguments)
{
const TIntermTyped *argTyped = arg->getAsTyped();
ASSERT(argTyped != nullptr);
if (type.getBasicType() != EbtStruct && IsOpaqueType(argTyped->getBasicType()))
{
std::string reason("cannot convert a variable with type ");
reason += getBasicString(argTyped->getBasicType());
error(line, reason.c_str(), "constructor");
return false;
}
if (argTyped->getBasicType() == EbtVoid)
{
error(line, "cannot convert a void", "constructor");
return false;
}
}
if (type.isArray())
{
// The size of an unsized constructor should already have been determined.
ASSERT(!type.isUnsizedArray());
if (static_cast<size_t>(type.getArraySize()) != arguments->size())
{
error(line, "array constructor needs one argument per array element", "constructor");
return false;
}
// GLSL ES 3.00 section 5.4.4: Each argument must be the same type as the element type of
// the array.
for (TIntermNode *const &argNode : *arguments)
{
const TType &argType = argNode->getAsTyped()->getType();
if (argType.isArray())
{
error(line, "constructing from a non-dereferenced array", "constructor");
return false;
}
if (!argType.sameElementType(type))
{
error(line, "Array constructor argument has an incorrect type", "constructor");
return false;
}
}
}
else if (type.getBasicType() == EbtStruct)
{
const TFieldList &fields = type.getStruct()->fields();
if (fields.size() != arguments->size())
{
error(line,
"Number of constructor parameters does not match the number of structure fields",
"constructor");
return false;
}
for (size_t i = 0; i < fields.size(); i++)
{
if (i >= arguments->size() ||
(*arguments)[i]->getAsTyped()->getType() != *fields[i]->type())
{
error(line, "Structure constructor arguments do not match structure fields",
"constructor");
return false;
}
}
}
else
{
// We're constructing a scalar, vector, or matrix.
// Note: It's okay to have too many components available, but not okay to have unused
// arguments. 'full' will go to true when enough args have been seen. If we loop again,
// there is an extra argument, so 'overFull' will become true.
size_t size = 0;
bool full = false;
bool overFull = false;
bool matrixArg = false;
for (TIntermNode *arg : *arguments)
{
const TIntermTyped *argTyped = arg->getAsTyped();
ASSERT(argTyped != nullptr);
if (argTyped->getType().isArray())
{
error(line, "constructing from a non-dereferenced array", "constructor");
return false;
}
if (argTyped->getType().isMatrix())
{
matrixArg = true;
}
size += argTyped->getType().getObjectSize();
if (full)
{
overFull = true;
}
if (type.getBasicType() != EbtStruct && !type.isArray() && size >= type.getObjectSize())
{
full = true;
}
}
if (type.isMatrix() && matrixArg)
{
if (arguments->size() != 1)
{
error(line, "constructing matrix from matrix can only take one argument",
"constructor");
return false;
}
}
else
{
if (size != 1 && size < type.getObjectSize())
{
error(line, "not enough data provided for construction", "constructor");
return false;
}
if (overFull)
{
error(line, "too many arguments", "constructor");
return false;
}
}
}
return true;
}
// This function checks to see if a void variable has been declared and raise an error message for
// such a case
//
// returns true in case of an error
//
bool TParseContext::checkIsNonVoid(const TSourceLoc &line,
const TString &identifier,
const TBasicType &type)
{
if (type == EbtVoid)
{
error(line, "illegal use of type 'void'", identifier.c_str());
return false;
}
return true;
}
// This function checks to see if the node (for the expression) contains a scalar boolean expression
// or not.
void TParseContext::checkIsScalarBool(const TSourceLoc &line, const TIntermTyped *type)
{
if (type->getBasicType() != EbtBool || type->isArray() || type->isMatrix() || type->isVector())
{
error(line, "boolean expression expected", "");
}
}
// This function checks to see if the node (for the expression) contains a scalar boolean expression
// or not.
void TParseContext::checkIsScalarBool(const TSourceLoc &line, const TPublicType &pType)
{
if (pType.getBasicType() != EbtBool || pType.isAggregate())
{
error(line, "boolean expression expected", "");
}
}
bool TParseContext::checkIsNotOpaqueType(const TSourceLoc &line,
const TTypeSpecifierNonArray &pType,
const char *reason)
{
if (pType.type == EbtStruct)
{
if (ContainsSampler(*pType.userDef))
{
std::stringstream reasonStream;
reasonStream << reason << " (structure contains a sampler)";
std::string reasonStr = reasonStream.str();
error(line, reasonStr.c_str(), getBasicString(pType.type));
return false;
}
// only samplers need to be checked from structs, since other opaque types can't be struct
// members.
return true;
}
else if (IsOpaqueType(pType.type))
{
error(line, reason, getBasicString(pType.type));
return false;
}
return true;
}
void TParseContext::checkDeclaratorLocationIsNotSpecified(const TSourceLoc &line,
const TPublicType &pType)
{
if (pType.layoutQualifier.location != -1)
{
error(line, "location must only be specified for a single input or output variable",
"location");
}
}
void TParseContext::checkLocationIsNotSpecified(const TSourceLoc &location,
const TLayoutQualifier &layoutQualifier)
{
if (layoutQualifier.location != -1)
{
const char *errorMsg = "invalid layout qualifier: only valid on program inputs and outputs";
if (mShaderVersion >= 310)
{
errorMsg =
"invalid layout qualifier: only valid on program inputs, outputs, and uniforms";
}
error(location, errorMsg, "location");
}
}
void TParseContext::checkOutParameterIsNotOpaqueType(const TSourceLoc &line,
TQualifier qualifier,
const TType &type)
{
ASSERT(qualifier == EvqOut || qualifier == EvqInOut);
if (IsOpaqueType(type.getBasicType()))
{
error(line, "opaque types cannot be output parameters", type.getBasicString());
}
}
// Do size checking for an array type's size.
unsigned int TParseContext::checkIsValidArraySize(const TSourceLoc &line, TIntermTyped *expr)
{
TIntermConstantUnion *constant = expr->getAsConstantUnion();
// TODO(oetuaho@nvidia.com): Get rid of the constant == nullptr check here once all constant
// expressions can be folded. Right now we don't allow constant expressions that ANGLE can't
// fold as array size.
if (expr->getQualifier() != EvqConst || constant == nullptr || !constant->isScalarInt())
{
error(line, "array size must be a constant integer expression", "");
return 1u;
}
unsigned int size = 0u;
if (constant->getBasicType() == EbtUInt)
{
size = constant->getUConst(0);
}
else
{
int signedSize = constant->getIConst(0);
if (signedSize < 0)
{
error(line, "array size must be non-negative", "");
return 1u;
}
size = static_cast<unsigned int>(signedSize);
}
if (size == 0u)
{
error(line, "array size must be greater than zero", "");
return 1u;
}
// The size of arrays is restricted here to prevent issues further down the
// compiler/translator/driver stack. Shader Model 5 generation hardware is limited to
// 4096 registers so this should be reasonable even for aggressively optimizable code.
const unsigned int sizeLimit = 65536;
if (size > sizeLimit)
{
error(line, "array size too large", "");
return 1u;
}
return size;
}
// See if this qualifier can be an array.
bool TParseContext::checkIsValidQualifierForArray(const TSourceLoc &line,
const TPublicType &elementQualifier)
{
if ((elementQualifier.qualifier == EvqAttribute) ||
(elementQualifier.qualifier == EvqVertexIn) ||
(elementQualifier.qualifier == EvqConst && mShaderVersion < 300))
{
error(line, "cannot declare arrays of this qualifier",
TType(elementQualifier).getQualifierString());
return false;
}
return true;
}
// See if this element type can be formed into an array.
bool TParseContext::checkIsValidTypeForArray(const TSourceLoc &line, const TPublicType &elementType)
{
//
// Can the type be an array?
//
if (elementType.array)
{
error(line, "cannot declare arrays of arrays",
TType(elementType).getCompleteString().c_str());
return false;
}
// In ESSL1.00 shaders, structs cannot be varying (section 4.3.5). This is checked elsewhere.
// In ESSL3.00 shaders, struct inputs/outputs are allowed but not arrays of structs (section
// 4.3.4).
if (mShaderVersion >= 300 && elementType.getBasicType() == EbtStruct &&
sh::IsVarying(elementType.qualifier))
{
error(line, "cannot declare arrays of structs of this qualifier",
TType(elementType).getCompleteString().c_str());
return false;
}
return true;
}
// Check if this qualified element type can be formed into an array.
bool TParseContext::checkIsValidTypeAndQualifierForArray(const TSourceLoc &indexLocation,
const TPublicType &elementType)
{
if (checkIsValidTypeForArray(indexLocation, elementType))
{
return checkIsValidQualifierForArray(indexLocation, elementType);
}
return false;
}
// Enforce non-initializer type/qualifier rules.
void TParseContext::checkCanBeDeclaredWithoutInitializer(const TSourceLoc &line,
const TString &identifier,
TPublicType *type)
{
ASSERT(type != nullptr);
if (type->qualifier == EvqConst)
{
// Make the qualifier make sense.
type->qualifier = EvqTemporary;
// Generate informative error messages for ESSL1.
// In ESSL3 arrays and structures containing arrays can be constant.
if (mShaderVersion < 300 && type->isStructureContainingArrays())
{
error(line,
"structures containing arrays may not be declared constant since they cannot be "
"initialized",
identifier.c_str());
}
else
{
error(line, "variables with qualifier 'const' must be initialized", identifier.c_str());
}
return;
}
if (type->isUnsizedArray())
{
error(line, "implicitly sized arrays need to be initialized", identifier.c_str());
}
}
// Do some simple checks that are shared between all variable declarations,
// and update the symbol table.
//
// Returns true if declaring the variable succeeded.
//
bool TParseContext::declareVariable(const TSourceLoc &line,
const TString &identifier,
const TType &type,
TVariable **variable)
{
ASSERT((*variable) == nullptr);
checkBindingIsValid(line, type);
bool needsReservedCheck = true;
// gl_LastFragData may be redeclared with a new precision qualifier
if (type.isArray() && identifier.compare(0, 15, "gl_LastFragData") == 0)
{
const TVariable *maxDrawBuffers = static_cast<const TVariable *>(
symbolTable.findBuiltIn("gl_MaxDrawBuffers", mShaderVersion));
if (static_cast<int>(type.getArraySize()) == maxDrawBuffers->getConstPointer()->getIConst())
{
if (TSymbol *builtInSymbol = symbolTable.findBuiltIn(identifier, mShaderVersion))
{
needsReservedCheck = !checkCanUseExtension(line, builtInSymbol->getExtension());
}
}
else
{
error(line, "redeclaration of gl_LastFragData with size != gl_MaxDrawBuffers",
identifier.c_str());
return false;
}
}
if (needsReservedCheck && !checkIsNotReserved(line, identifier))
return false;
(*variable) = new TVariable(&identifier, type);
if (!symbolTable.declare(*variable))
{
error(line, "redefinition", identifier.c_str());
*variable = nullptr;
return false;
}
if (!checkIsNonVoid(line, identifier, type.getBasicType()))
return false;
return true;
}
void TParseContext::checkIsParameterQualifierValid(
const TSourceLoc &line,
const TTypeQualifierBuilder &typeQualifierBuilder,
TType *type)
{
TTypeQualifier typeQualifier = typeQualifierBuilder.getParameterTypeQualifier(mDiagnostics);
if (typeQualifier.qualifier == EvqOut || typeQualifier.qualifier == EvqInOut)
{
checkOutParameterIsNotOpaqueType(line, typeQualifier.qualifier, *type);
}
if (!IsImage(type->getBasicType()))
{
checkMemoryQualifierIsNotSpecified(typeQualifier.memoryQualifier, line);
}
else
{
type->setMemoryQualifier(typeQualifier.memoryQualifier);
}
type->setQualifier(typeQualifier.qualifier);
if (typeQualifier.precision != EbpUndefined)
{
type->setPrecision(typeQualifier.precision);
}
}
bool TParseContext::checkCanUseExtension(const TSourceLoc &line, const TString &extension)
{
const TExtensionBehavior &extBehavior = extensionBehavior();
TExtensionBehavior::const_iterator iter = extBehavior.find(extension.c_str());
if (iter == extBehavior.end())
{
error(line, "extension is not supported", extension.c_str());
return false;
}
// In GLSL ES, an extension's default behavior is "disable".
if (iter->second == EBhDisable || iter->second == EBhUndefined)
{
// TODO(oetuaho@nvidia.com): This is slightly hacky. Might be better if symbols could be
// associated with more than one extension.
if (extension == "GL_OVR_multiview")
{
return checkCanUseExtension(line, "GL_OVR_multiview2");
}
error(line, "extension is disabled", extension.c_str());
return false;
}
if (iter->second == EBhWarn)
{
warning(line, "extension is being used", extension.c_str());
return true;
}
return true;
}
// ESSL 3.00.6 section 4.8 Empty Declarations: "The combinations of qualifiers that cause
// compile-time or link-time errors are the same whether or not the declaration is empty".
// This function implements all the checks that are done on qualifiers regardless of if the
// declaration is empty.
void TParseContext::declarationQualifierErrorCheck(const sh::TQualifier qualifier,
const sh::TLayoutQualifier &layoutQualifier,
const TSourceLoc &location)
{
if (qualifier == EvqShared && !layoutQualifier.isEmpty())
{
error(location, "Shared memory declarations cannot have layout specified", "layout");
}
if (layoutQualifier.matrixPacking != EmpUnspecified)
{
error(location, "layout qualifier only valid for interface blocks",
getMatrixPackingString(layoutQualifier.matrixPacking));
return;
}
if (layoutQualifier.blockStorage != EbsUnspecified)
{
error(location, "layout qualifier only valid for interface blocks",
getBlockStorageString(layoutQualifier.blockStorage));
return;
}
if (qualifier == EvqFragmentOut)
{
if (layoutQualifier.location != -1 && layoutQualifier.yuv == true)
{
error(location, "invalid layout qualifier combination", "yuv");
return;
}
}
else
{
checkYuvIsNotSpecified(location, layoutQualifier.yuv);
}
bool canHaveLocation = qualifier == EvqVertexIn || qualifier == EvqFragmentOut;
if (mShaderVersion >= 310 && qualifier == EvqUniform)
{
canHaveLocation = true;
// We're not checking whether the uniform location is in range here since that depends on
// the type of the variable.
// The type can only be fully determined for non-empty declarations.
}
if (!canHaveLocation)
{
checkLocationIsNotSpecified(location, layoutQualifier);
}
}
void TParseContext::emptyDeclarationErrorCheck(const TPublicType &publicType,
const TSourceLoc &location)
{
if (publicType.isUnsizedArray())
{
// ESSL3 spec section 4.1.9: Array declaration which leaves the size unspecified is an
// error. It is assumed that this applies to empty declarations as well.
error(location, "empty array declaration needs to specify a size", "");
}
}
// These checks are done for all declarations that are non-empty. They're done for non-empty
// declarations starting a declarator list, and declarators that follow an empty declaration.
void TParseContext::nonEmptyDeclarationErrorCheck(const TPublicType &publicType,
const TSourceLoc &identifierLocation)
{
switch (publicType.qualifier)
{
case EvqVaryingIn:
case EvqVaryingOut:
case EvqAttribute:
case EvqVertexIn:
case EvqFragmentOut:
case EvqComputeIn:
if (publicType.getBasicType() == EbtStruct)
{
error(identifierLocation, "cannot be used with a structure",
getQualifierString(publicType.qualifier));
return;
}
default:
break;
}
std::string reason(getBasicString(publicType.getBasicType()));
reason += "s must be uniform";
if (publicType.qualifier != EvqUniform &&
!checkIsNotOpaqueType(identifierLocation, publicType.typeSpecifierNonArray, reason.c_str()))
{
return;
}
if ((publicType.qualifier != EvqTemporary && publicType.qualifier != EvqGlobal &&
publicType.qualifier != EvqConst) &&
publicType.getBasicType() == EbtYuvCscStandardEXT)
{
error(identifierLocation, "cannot be used with a yuvCscStandardEXT",
getQualifierString(publicType.qualifier));
return;
}
if (mShaderVersion >= 310 && publicType.qualifier == EvqUniform)
{
// Valid uniform declarations can't be unsized arrays since uniforms can't be initialized.
// But invalid shaders may still reach here with an unsized array declaration.
if (!publicType.isUnsizedArray())
{
TType type(publicType);
checkUniformLocationInRange(identifierLocation, type.getLocationCount(),
publicType.layoutQualifier);
}
}
// check for layout qualifier issues
const TLayoutQualifier layoutQualifier = publicType.layoutQualifier;
if (IsImage(publicType.getBasicType()))
{
switch (layoutQualifier.imageInternalFormat)
{
case EiifRGBA32F:
case EiifRGBA16F:
case EiifR32F:
case EiifRGBA8:
case EiifRGBA8_SNORM:
if (!IsFloatImage(publicType.getBasicType()))
{
error(identifierLocation,
"internal image format requires a floating image type",
getBasicString(publicType.getBasicType()));
return;
}
break;
case EiifRGBA32I:
case EiifRGBA16I:
case EiifRGBA8I:
case EiifR32I:
if (!IsIntegerImage(publicType.getBasicType()))
{
error(identifierLocation,
"internal image format requires an integer image type",
getBasicString(publicType.getBasicType()));
return;
}
break;
case EiifRGBA32UI:
case EiifRGBA16UI:
case EiifRGBA8UI:
case EiifR32UI:
if (!IsUnsignedImage(publicType.getBasicType()))
{
error(identifierLocation,
"internal image format requires an unsigned image type",
getBasicString(publicType.getBasicType()));
return;
}
break;
case EiifUnspecified:
error(identifierLocation, "layout qualifier", "No image internal format specified");
return;
default:
error(identifierLocation, "layout qualifier", "unrecognized token");
return;
}
// GLSL ES 3.10 Revision 4, 4.9 Memory Access Qualifiers
switch (layoutQualifier.imageInternalFormat)
{
case EiifR32F:
case EiifR32I:
case EiifR32UI:
break;
default:
if (!publicType.memoryQualifier.readonly && !publicType.memoryQualifier.writeonly)
{
error(identifierLocation, "layout qualifier",
"Except for images with the r32f, r32i and r32ui format qualifiers, "
"image variables must be qualified readonly and/or writeonly");
return;
}
break;
}
}
else
{
checkInternalFormatIsNotSpecified(identifierLocation, layoutQualifier.imageInternalFormat);
checkMemoryQualifierIsNotSpecified(publicType.memoryQualifier, identifierLocation);
}
}
void TParseContext::checkBindingIsValid(const TSourceLoc &identifierLocation, const TType &type)
{
TLayoutQualifier layoutQualifier = type.getLayoutQualifier();
int arraySize = type.isArray() ? type.getArraySize() : 1;
if (IsImage(type.getBasicType()))
{
checkImageBindingIsValid(identifierLocation, layoutQualifier.binding, arraySize);
}
else if (IsSampler(type.getBasicType()))
{
checkSamplerBindingIsValid(identifierLocation, layoutQualifier.binding, arraySize);
}
else
{
ASSERT(!IsOpaqueType(type.getBasicType()));
checkBindingIsNotSpecified(identifierLocation, layoutQualifier.binding);
}
}
void TParseContext::checkLayoutQualifierSupported(const TSourceLoc &location,
const TString &layoutQualifierName,
int versionRequired)
{
if (mShaderVersion < versionRequired)
{
error(location, "invalid layout qualifier: not supported", layoutQualifierName.c_str());
}
}
bool TParseContext::checkWorkGroupSizeIsNotSpecified(const TSourceLoc &location,
const TLayoutQualifier &layoutQualifier)
{
const sh::WorkGroupSize &localSize = layoutQualifier.localSize;
for (size_t i = 0u; i < localSize.size(); ++i)
{
if (localSize[i] != -1)
{
error(location,
"invalid layout qualifier: only valid when used with 'in' in a compute shader "
"global layout declaration",
getWorkGroupSizeString(i));
return false;
}
}
return true;
}
void TParseContext::checkInternalFormatIsNotSpecified(const TSourceLoc &location,
TLayoutImageInternalFormat internalFormat)
{
if (internalFormat != EiifUnspecified)
{
error(location, "invalid layout qualifier: only valid when used with images",
getImageInternalFormatString(internalFormat));
}
}
void TParseContext::checkBindingIsNotSpecified(const TSourceLoc &location, int binding)
{
if (binding != -1)
{
error(location,
"invalid layout qualifier: only valid when used with opaque types or blocks",
"binding");
}
}
void TParseContext::checkImageBindingIsValid(const TSourceLoc &location, int binding, int arraySize)
{
// Expects arraySize to be 1 when setting binding for only a single variable.
if (binding >= 0 && binding + arraySize > mMaxImageUnits)
{
error(location, "image binding greater than gl_MaxImageUnits", "binding");
}
}
void TParseContext::checkSamplerBindingIsValid(const TSourceLoc &location,
int binding,
int arraySize)
{
// Expects arraySize to be 1 when setting binding for only a single variable.
if (binding >= 0 && binding + arraySize > mMaxCombinedTextureImageUnits)
{
error(location, "sampler binding greater than maximum texture units", "binding");
}
}
void TParseContext::checkUniformLocationInRange(const TSourceLoc &location,
int objectLocationCount,
const TLayoutQualifier &layoutQualifier)
{
int loc = layoutQualifier.location;
if (loc >= 0 && loc + objectLocationCount > mMaxUniformLocations)
{
error(location, "Uniform location out of range", "location");
}
}
void TParseContext::checkYuvIsNotSpecified(const TSourceLoc &location, bool yuv)
{
if (yuv != false)
{
error(location, "invalid layout qualifier: only valid on program outputs", "yuv");
}
}
void TParseContext::functionCallLValueErrorCheck(const TFunction *fnCandidate,
TIntermAggregate *fnCall)
{
for (size_t i = 0; i < fnCandidate->getParamCount(); ++i)
{
TQualifier qual = fnCandidate->getParam(i).type->getQualifier();
if (qual == EvqOut || qual == EvqInOut)
{
TIntermTyped *argument = (*(fnCall->getSequence()))[i]->getAsTyped();
if (!checkCanBeLValue(argument->getLine(), "assign", argument))
{
error(argument->getLine(),
"Constant value cannot be passed for 'out' or 'inout' parameters.",
fnCall->getFunctionSymbolInfo()->getName().c_str());
return;
}
}
}
}
void TParseContext::checkInvariantVariableQualifier(bool invariant,
const TQualifier qualifier,
const TSourceLoc &invariantLocation)
{
if (!invariant)
return;
if (mShaderVersion < 300)
{
// input variables in the fragment shader can be also qualified as invariant
if (!sh::CanBeInvariantESSL1(qualifier))
{
error(invariantLocation, "Cannot be qualified as invariant.", "invariant");
}
}
else
{
if (!sh::CanBeInvariantESSL3OrGreater(qualifier))
{
error(invariantLocation, "Cannot be qualified as invariant.", "invariant");
}
}
}
bool TParseContext::supportsExtension(const char *extension)
{
const TExtensionBehavior &extbehavior = extensionBehavior();
TExtensionBehavior::const_iterator iter = extbehavior.find(extension);
return (iter != extbehavior.end());
}
bool TParseContext::isExtensionEnabled(const char *extension) const
{
return ::IsExtensionEnabled(extensionBehavior(), extension);
}
void TParseContext::handleExtensionDirective(const TSourceLoc &loc,
const char *extName,
const char *behavior)
{
pp::SourceLocation srcLoc;
srcLoc.file = loc.first_file;
srcLoc.line = loc.first_line;
mDirectiveHandler.handleExtension(srcLoc, extName, behavior);
}
void TParseContext::handlePragmaDirective(const TSourceLoc &loc,
const char *name,
const char *value,
bool stdgl)
{
pp::SourceLocation srcLoc;
srcLoc.file = loc.first_file;
srcLoc.line = loc.first_line;
mDirectiveHandler.handlePragma(srcLoc, name, value, stdgl);
}
sh::WorkGroupSize TParseContext::getComputeShaderLocalSize() const
{
sh::WorkGroupSize result;
for (size_t i = 0u; i < result.size(); ++i)
{
if (mComputeShaderLocalSizeDeclared && mComputeShaderLocalSize[i] == -1)
{
result[i] = 1;
}
else
{
result[i] = mComputeShaderLocalSize[i];
}
}
return result;
}
/////////////////////////////////////////////////////////////////////////////////
//
// Non-Errors.
//
/////////////////////////////////////////////////////////////////////////////////
const TVariable *TParseContext::getNamedVariable(const TSourceLoc &location,
const TString *name,
const TSymbol *symbol)
{
const TVariable *variable = nullptr;
if (!symbol)
{
error(location, "undeclared identifier", name->c_str());
}
else if (!symbol->isVariable())
{
error(location, "variable expected", name->c_str());
}
else
{
variable = static_cast<const TVariable *>(symbol);
if (symbolTable.findBuiltIn(variable->getName(), mShaderVersion) &&
!variable->getExtension().empty())
{
checkCanUseExtension(location, variable->getExtension());
}
// Reject shaders using both gl_FragData and gl_FragColor
TQualifier qualifier = variable->getType().getQualifier();
if (qualifier == EvqFragData || qualifier == EvqSecondaryFragDataEXT)
{
mUsesFragData = true;
}
else if (qualifier == EvqFragColor || qualifier == EvqSecondaryFragColorEXT)
{
mUsesFragColor = true;
}
if (qualifier == EvqSecondaryFragDataEXT || qualifier == EvqSecondaryFragColorEXT)
{
mUsesSecondaryOutputs = true;
}
// This validation is not quite correct - it's only an error to write to
// both FragData and FragColor. For simplicity, and because users shouldn't
// be rewarded for reading from undefined varaibles, return an error
// if they are both referenced, rather than assigned.
if (mUsesFragData && mUsesFragColor)
{
const char *errorMessage = "cannot use both gl_FragData and gl_FragColor";
if (mUsesSecondaryOutputs)
{
errorMessage =
"cannot use both output variable sets (gl_FragData, gl_SecondaryFragDataEXT)"
" and (gl_FragColor, gl_SecondaryFragColorEXT)";
}
error(location, errorMessage, name->c_str());
}
// GLSL ES 3.1 Revision 4, 7.1.3 Compute Shader Special Variables
if (getShaderType() == GL_COMPUTE_SHADER && !mComputeShaderLocalSizeDeclared &&
qualifier == EvqWorkGroupSize)
{
error(location,
"It is an error to use gl_WorkGroupSize before declaring the local group size",
"gl_WorkGroupSize");
}
}
if (!variable)
{
TType type(EbtFloat, EbpUndefined);
TVariable *fakeVariable = new TVariable(name, type);
symbolTable.declare(fakeVariable);
variable = fakeVariable;
}
return variable;
}
TIntermTyped *TParseContext::parseVariableIdentifier(const TSourceLoc &location,
const TString *name,
const TSymbol *symbol)
{
const TVariable *variable = getNamedVariable(location, name, symbol);
if (variable->getType().getQualifier() == EvqViewIDOVR && IsWebGLBasedSpec(mShaderSpec) &&
mShaderType == GL_FRAGMENT_SHADER && !isExtensionEnabled("GL_OVR_multiview2"))
{
// WEBGL_multiview spec
error(location, "Need to enable OVR_multiview2 to use gl_ViewID_OVR in fragment shader",
"gl_ViewID_OVR");
}
if (variable->getConstPointer())
{
const TConstantUnion *constArray = variable->getConstPointer();
return intermediate.addConstantUnion(constArray, variable->getType(), location);
}
else if (variable->getType().getQualifier() == EvqWorkGroupSize &&
mComputeShaderLocalSizeDeclared)
{
// gl_WorkGroupSize can be used to size arrays according to the ESSL 3.10.4 spec, so it
// needs to be added to the AST as a constant and not as a symbol.
sh::WorkGroupSize workGroupSize = getComputeShaderLocalSize();
TConstantUnion *constArray = new TConstantUnion[3];
for (size_t i = 0; i < 3; ++i)
{
constArray[i].setUConst(static_cast<unsigned int>(workGroupSize[i]));
}
ASSERT(variable->getType().getBasicType() == EbtUInt);
ASSERT(variable->getType().getObjectSize() == 3);
TType type(variable->getType());
type.setQualifier(EvqConst);
return intermediate.addConstantUnion(constArray, type, location);
}
else
{
return intermediate.addSymbol(variable->getUniqueId(), variable->getName(),
variable->getType(), location);
}
}
//
// Initializers show up in several places in the grammar. Have one set of
// code to handle them here.
//
// Returns true on error, false if no error
//
bool TParseContext::executeInitializer(const TSourceLoc &line,
const TString &identifier,
const TPublicType &pType,
TIntermTyped *initializer,
TIntermBinary **initNode)
{
ASSERT(initNode != nullptr);
ASSERT(*initNode == nullptr);
TType type = TType(pType);
TVariable *variable = nullptr;
if (type.isUnsizedArray())
{
// We have not checked yet whether the initializer actually is an array or not.
if (initializer->isArray())
{
type.setArraySize(initializer->getArraySize());
}
else
{
// Having a non-array initializer for an unsized array will result in an error later,
// so we don't generate an error message here.
type.setArraySize(1u);
}
}
if (!declareVariable(line, identifier, type, &variable))
{
return true;
}
bool globalInitWarning = false;
if (symbolTable.atGlobalLevel() &&
!ValidateGlobalInitializer(initializer, this, &globalInitWarning))
{
// Error message does not completely match behavior with ESSL 1.00, but
// we want to steer developers towards only using constant expressions.
error(line, "global variable initializers must be constant expressions", "=");
return true;
}
if (globalInitWarning)
{
warning(
line,
"global variable initializers should be constant expressions "
"(uniforms and globals are allowed in global initializers for legacy compatibility)",
"=");
}
//
// identifier must be of type constant, a global, or a temporary
//
TQualifier qualifier = variable->getType().getQualifier();
if ((qualifier != EvqTemporary) && (qualifier != EvqGlobal) && (qualifier != EvqConst))
{
error(line, " cannot initialize this type of qualifier ",
variable->getType().getQualifierString());
return true;
}
//
// test for and propagate constant
//
if (qualifier == EvqConst)
{
if (qualifier != initializer->getType().getQualifier())
{
std::stringstream reasonStream;
reasonStream << "assigning non-constant to '" << variable->getType().getCompleteString()
<< "'";
std::string reason = reasonStream.str();
error(line, reason.c_str(), "=");
variable->getType().setQualifier(EvqTemporary);
return true;
}
if (type != initializer->getType())
{
error(line, " non-matching types for const initializer ",
variable->getType().getQualifierString());
variable->getType().setQualifier(EvqTemporary);
return true;
}
// Save the constant folded value to the variable if possible. For example array
// initializers are not folded, since that way copying the array literal to multiple places
// in the shader is avoided.
// TODO(oetuaho@nvidia.com): Consider constant folding array initialization in cases where
// it would be beneficial.
if (initializer->getAsConstantUnion())
{
variable->shareConstPointer(initializer->getAsConstantUnion()->getUnionArrayPointer());
*initNode = nullptr;
return false;
}
else if (initializer->getAsSymbolNode())
{
const TSymbol *symbol =
symbolTable.find(initializer->getAsSymbolNode()->getSymbol(), 0);
const TVariable *tVar = static_cast<const TVariable *>(symbol);
const TConstantUnion *constArray = tVar->getConstPointer();
if (constArray)
{
variable->shareConstPointer(constArray);
*initNode = nullptr;
return false;
}
}
}
TIntermSymbol *intermSymbol = intermediate.addSymbol(
variable->getUniqueId(), variable->getName(), variable->getType(), line);
*initNode = createAssign(EOpInitialize, intermSymbol, initializer, line);
if (*initNode == nullptr)
{
assignError(line, "=", intermSymbol->getCompleteString(), initializer->getCompleteString());
return true;
}
return false;
}
void TParseContext::addFullySpecifiedType(TPublicType *typeSpecifier)
{
checkPrecisionSpecified(typeSpecifier->getLine(), typeSpecifier->precision,
typeSpecifier->getBasicType());
if (mShaderVersion < 300 && typeSpecifier->array)
{
error(typeSpecifier->getLine(), "not supported", "first-class array");
typeSpecifier->clearArrayness();
}
}
TPublicType TParseContext::addFullySpecifiedType(const TTypeQualifierBuilder &typeQualifierBuilder,
const TPublicType &typeSpecifier)
{
TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(mDiagnostics);
TPublicType returnType = typeSpecifier;
returnType.qualifier = typeQualifier.qualifier;
returnType.invariant = typeQualifier.invariant;
returnType.layoutQualifier = typeQualifier.layoutQualifier;
returnType.memoryQualifier = typeQualifier.memoryQualifier;
returnType.precision = typeSpecifier.precision;
if (typeQualifier.precision != EbpUndefined)
{
returnType.precision = typeQualifier.precision;
}
checkPrecisionSpecified(typeSpecifier.getLine(), returnType.precision,
typeSpecifier.getBasicType());
checkInvariantVariableQualifier(returnType.invariant, returnType.qualifier,
typeSpecifier.getLine());
checkWorkGroupSizeIsNotSpecified(typeSpecifier.getLine(), returnType.layoutQualifier);
if (mShaderVersion < 300)
{
if (typeSpecifier.array)
{
error(typeSpecifier.getLine(), "not supported", "first-class array");
returnType.clearArrayness();
}
if (returnType.qualifier == EvqAttribute &&
(typeSpecifier.getBasicType() == EbtBool || typeSpecifier.getBasicType() == EbtInt))
{
error(typeSpecifier.getLine(), "cannot be bool or int",
getQualifierString(returnType.qualifier));
}
if ((returnType.qualifier == EvqVaryingIn || returnType.qualifier == EvqVaryingOut) &&
(typeSpecifier.getBasicType() == EbtBool || typeSpecifier.getBasicType() == EbtInt))
{
error(typeSpecifier.getLine(), "cannot be bool or int",
getQualifierString(returnType.qualifier));
}
}
else
{
if (!returnType.layoutQualifier.isEmpty())
{
checkIsAtGlobalLevel(typeSpecifier.getLine(), "layout");
}
if (sh::IsVarying(returnType.qualifier) || returnType.qualifier == EvqVertexIn ||
returnType.qualifier == EvqFragmentOut)
{
checkInputOutputTypeIsValidES3(returnType.qualifier, typeSpecifier,
typeSpecifier.getLine());
}
if (returnType.qualifier == EvqComputeIn)
{
error(typeSpecifier.getLine(), "'in' can be only used to specify the local group size",
"in");
}
}
return returnType;
}
void TParseContext::checkInputOutputTypeIsValidES3(const TQualifier qualifier,
const TPublicType &type,
const TSourceLoc &qualifierLocation)
{
// An input/output variable can never be bool or a sampler. Samplers are checked elsewhere.
if (type.getBasicType() == EbtBool)
{
error(qualifierLocation, "cannot be bool", getQualifierString(qualifier));
}
// Specific restrictions apply for vertex shader inputs and fragment shader outputs.
switch (qualifier)
{
case EvqVertexIn:
// ESSL 3.00 section 4.3.4
if (type.array)
{
error(qualifierLocation, "cannot be array", getQualifierString(qualifier));
}
// Vertex inputs with a struct type are disallowed in nonEmptyDeclarationErrorCheck
return;
case EvqFragmentOut:
// ESSL 3.00 section 4.3.6
if (type.typeSpecifierNonArray.isMatrix())
{
error(qualifierLocation, "cannot be matrix", getQualifierString(qualifier));
}
// Fragment outputs with a struct type are disallowed in nonEmptyDeclarationErrorCheck
return;
default:
break;
}
// Vertex shader outputs / fragment shader inputs have a different, slightly more lenient set of
// restrictions.
bool typeContainsIntegers =
(type.getBasicType() == EbtInt || type.getBasicType() == EbtUInt ||
type.isStructureContainingType(EbtInt) || type.isStructureContainingType(EbtUInt));
if (typeContainsIntegers && qualifier != EvqFlatIn && qualifier != EvqFlatOut)
{
error(qualifierLocation, "must use 'flat' interpolation here",
getQualifierString(qualifier));
}
if (type.getBasicType() == EbtStruct)
{
// ESSL 3.00 sections 4.3.4 and 4.3.6.
// These restrictions are only implied by the ESSL 3.00 spec, but
// the ESSL 3.10 spec lists these restrictions explicitly.
if (type.array)
{
error(qualifierLocation, "cannot be an array of structures",
getQualifierString(qualifier));
}
if (type.isStructureContainingArrays())
{
error(qualifierLocation, "cannot be a structure containing an array",
getQualifierString(qualifier));
}
if (type.isStructureContainingType(EbtStruct))
{
error(qualifierLocation, "cannot be a structure containing a structure",
getQualifierString(qualifier));
}
if (type.isStructureContainingType(EbtBool))
{
error(qualifierLocation, "cannot be a structure containing a bool",
getQualifierString(qualifier));
}
}
}
void TParseContext::checkLocalVariableConstStorageQualifier(const TQualifierWrapperBase &qualifier)
{
if (qualifier.getType() == QtStorage)
{
const TStorageQualifierWrapper &storageQualifier =
static_cast<const TStorageQualifierWrapper &>(qualifier);
if (!declaringFunction() && storageQualifier.getQualifier() != EvqConst &&
!symbolTable.atGlobalLevel())
{
error(storageQualifier.getLine(),
"Local variables can only use the const storage qualifier.",
storageQualifier.getQualifierString().c_str());
}
}
}
void TParseContext::checkMemoryQualifierIsNotSpecified(const TMemoryQualifier &memoryQualifier,
const TSourceLoc &location)
{
if (memoryQualifier.readonly)
{
error(location, "Only allowed with images.", "readonly");
}
if (memoryQualifier.writeonly)
{
error(location, "Only allowed with images.", "writeonly");
}
if (memoryQualifier.coherent)
{
error(location, "Only allowed with images.", "coherent");
}
if (memoryQualifier.restrictQualifier)
{
error(location, "Only allowed with images.", "restrict");
}
if (memoryQualifier.volatileQualifier)
{
error(location, "Only allowed with images.", "volatile");
}
}
TIntermDeclaration *TParseContext::parseSingleDeclaration(
TPublicType &publicType,
const TSourceLoc &identifierOrTypeLocation,
const TString &identifier)
{
TType type(publicType);
if ((mCompileOptions & SH_FLATTEN_PRAGMA_STDGL_INVARIANT_ALL) &&
mDirectiveHandler.pragma().stdgl.invariantAll)
{
TQualifier qualifier = type.getQualifier();
// The directive handler has already taken care of rejecting invalid uses of this pragma
// (for example, in ESSL 3.00 fragment shaders), so at this point, flatten it into all
// affected variable declarations:
//
// 1. Built-in special variables which are inputs to the fragment shader. (These are handled
// elsewhere, in TranslatorGLSL.)
//
// 2. Outputs from vertex shaders in ESSL 1.00 and 3.00 (EvqVaryingOut and EvqVertexOut). It
// is actually less likely that there will be bugs in the handling of ESSL 3.00 shaders, but
// the way this is currently implemented we have to enable this compiler option before
// parsing the shader and determining the shading language version it uses. If this were
// implemented as a post-pass, the workaround could be more targeted.
//
// 3. Inputs in ESSL 1.00 fragment shaders (EvqVaryingIn). This is somewhat in violation of
// the specification, but there are desktop OpenGL drivers that expect that this is the
// behavior of the #pragma when specified in ESSL 1.00 fragment shaders.
if (qualifier == EvqVaryingOut || qualifier == EvqVertexOut || qualifier == EvqVaryingIn)
{
type.setInvariant(true);
}
}
declarationQualifierErrorCheck(publicType.qualifier, publicType.layoutQualifier,
identifierOrTypeLocation);
bool emptyDeclaration = (identifier == "");
mDeferredNonEmptyDeclarationErrorCheck = emptyDeclaration;
TIntermSymbol *symbol = nullptr;
if (emptyDeclaration)
{
emptyDeclarationErrorCheck(publicType, identifierOrTypeLocation);
// In most cases we don't need to create a symbol node for an empty declaration.
// But if the empty declaration is declaring a struct type, the symbol node will store that.
if (type.getBasicType() == EbtStruct)
{
symbol = intermediate.addSymbol(0, "", type, identifierOrTypeLocation);
}
}
else
{
nonEmptyDeclarationErrorCheck(publicType, identifierOrTypeLocation);
checkCanBeDeclaredWithoutInitializer(identifierOrTypeLocation, identifier, &publicType);
TVariable *variable = nullptr;
declareVariable(identifierOrTypeLocation, identifier, type, &variable);
if (variable)
{
symbol = intermediate.addSymbol(variable->getUniqueId(), identifier, type,
identifierOrTypeLocation);
}
}
TIntermDeclaration *declaration = new TIntermDeclaration();
declaration->setLine(identifierOrTypeLocation);
if (symbol)
{
declaration->appendDeclarator(symbol);
}
return declaration;
}
TIntermDeclaration *TParseContext::parseSingleArrayDeclaration(TPublicType &publicType,
const TSourceLoc &identifierLocation,
const TString &identifier,
const TSourceLoc &indexLocation,
TIntermTyped *indexExpression)
{
mDeferredNonEmptyDeclarationErrorCheck = false;
declarationQualifierErrorCheck(publicType.qualifier, publicType.layoutQualifier,
identifierLocation);
nonEmptyDeclarationErrorCheck(publicType, identifierLocation);
checkCanBeDeclaredWithoutInitializer(identifierLocation, identifier, &publicType);
checkIsValidTypeAndQualifierForArray(indexLocation, publicType);
TType arrayType(publicType);
unsigned int size = checkIsValidArraySize(identifierLocation, indexExpression);
// Make the type an array even if size check failed.
// This ensures useless error messages regarding the variable's non-arrayness won't follow.
arrayType.setArraySize(size);
TVariable *variable = nullptr;
declareVariable(identifierLocation, identifier, arrayType, &variable);
TIntermDeclaration *declaration = new TIntermDeclaration();
declaration->setLine(identifierLocation);
TIntermSymbol *symbol = intermediate.addSymbol(0, identifier, arrayType, identifierLocation);
if (variable && symbol)
{
symbol->setId(variable->getUniqueId());
declaration->appendDeclarator(symbol);
}
return declaration;
}
TIntermDeclaration *TParseContext::parseSingleInitDeclaration(const TPublicType &publicType,
const TSourceLoc &identifierLocation,
const TString &identifier,
const TSourceLoc &initLocation,
TIntermTyped *initializer)
{
mDeferredNonEmptyDeclarationErrorCheck = false;
declarationQualifierErrorCheck(publicType.qualifier, publicType.layoutQualifier,
identifierLocation);
nonEmptyDeclarationErrorCheck(publicType, identifierLocation);
TIntermDeclaration *declaration = new TIntermDeclaration();
declaration->setLine(identifierLocation);
TIntermBinary *initNode = nullptr;
if (!executeInitializer(identifierLocation, identifier, publicType, initializer, &initNode))
{
if (initNode)
{
declaration->appendDeclarator(initNode);
}
}
return declaration;
}
TIntermDeclaration *TParseContext::parseSingleArrayInitDeclaration(
TPublicType &publicType,
const TSourceLoc &identifierLocation,
const TString &identifier,
const TSourceLoc &indexLocation,
TIntermTyped *indexExpression,
const TSourceLoc &initLocation,
TIntermTyped *initializer)
{
mDeferredNonEmptyDeclarationErrorCheck = false;
declarationQualifierErrorCheck(publicType.qualifier, publicType.layoutQualifier,
identifierLocation);
nonEmptyDeclarationErrorCheck(publicType, identifierLocation);
checkIsValidTypeAndQualifierForArray(indexLocation, publicType);
TPublicType arrayType(publicType);
unsigned int size = 0u;
// If indexExpression is nullptr, then the array will eventually get its size implicitly from
// the initializer.
if (indexExpression != nullptr)
{
size = checkIsValidArraySize(identifierLocation, indexExpression);
}
// Make the type an array even if size check failed.
// This ensures useless error messages regarding the variable's non-arrayness won't follow.
arrayType.setArraySize(size);
TIntermDeclaration *declaration = new TIntermDeclaration();
declaration->setLine(identifierLocation);
// initNode will correspond to the whole of "type b[n] = initializer".
TIntermBinary *initNode = nullptr;
if (!executeInitializer(identifierLocation, identifier, arrayType, initializer, &initNode))
{
if (initNode)
{
declaration->appendDeclarator(initNode);
}
}
return declaration;
}
TIntermInvariantDeclaration *TParseContext::parseInvariantDeclaration(
const TTypeQualifierBuilder &typeQualifierBuilder,
const TSourceLoc &identifierLoc,
const TString *identifier,
const TSymbol *symbol)
{
TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(mDiagnostics);
if (!typeQualifier.invariant)
{
error(identifierLoc, "Expected invariant", identifier->c_str());
return nullptr;
}
if (!checkIsAtGlobalLevel(identifierLoc, "invariant varying"))
{
return nullptr;
}
if (!symbol)
{
error(identifierLoc, "undeclared identifier declared as invariant", identifier->c_str());
return nullptr;
}
if (!IsQualifierUnspecified(typeQualifier.qualifier))
{
error(identifierLoc, "invariant declaration specifies qualifier",
getQualifierString(typeQualifier.qualifier));
}
if (typeQualifier.precision != EbpUndefined)
{
error(identifierLoc, "invariant declaration specifies precision",
getPrecisionString(typeQualifier.precision));
}
if (!typeQualifier.layoutQualifier.isEmpty())
{
error(identifierLoc, "invariant declaration specifies layout", "'layout'");
}
const TVariable *variable = getNamedVariable(identifierLoc, identifier, symbol);
ASSERT(variable);
const TType &type = variable->getType();
checkInvariantVariableQualifier(typeQualifier.invariant, type.getQualifier(),
typeQualifier.line);
checkMemoryQualifierIsNotSpecified(typeQualifier.memoryQualifier, typeQualifier.line);
symbolTable.addInvariantVarying(std::string(identifier->c_str()));
TIntermSymbol *intermSymbol =
intermediate.addSymbol(variable->getUniqueId(), *identifier, type, identifierLoc);
return new TIntermInvariantDeclaration(intermSymbol, identifierLoc);
}
void TParseContext::parseDeclarator(TPublicType &publicType,
const TSourceLoc &identifierLocation,
const TString &identifier,
TIntermDeclaration *declarationOut)
{
// If the declaration starting this declarator list was empty (example: int,), some checks were
// not performed.
if (mDeferredNonEmptyDeclarationErrorCheck)
{
nonEmptyDeclarationErrorCheck(publicType, identifierLocation);
mDeferredNonEmptyDeclarationErrorCheck = false;
}
checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
checkCanBeDeclaredWithoutInitializer(identifierLocation, identifier, &publicType);
TVariable *variable = nullptr;
TType type(publicType);
declareVariable(identifierLocation, identifier, type, &variable);
TIntermSymbol *symbol = intermediate.addSymbol(0, identifier, type, identifierLocation);
if (variable && symbol)
{
symbol->setId(variable->getUniqueId());
declarationOut->appendDeclarator(symbol);
}
}
void TParseContext::parseArrayDeclarator(TPublicType &publicType,
const TSourceLoc &identifierLocation,
const TString &identifier,
const TSourceLoc &arrayLocation,
TIntermTyped *indexExpression,
TIntermDeclaration *declarationOut)
{
// If the declaration starting this declarator list was empty (example: int,), some checks were
// not performed.
if (mDeferredNonEmptyDeclarationErrorCheck)
{
nonEmptyDeclarationErrorCheck(publicType, identifierLocation);
mDeferredNonEmptyDeclarationErrorCheck = false;
}
checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
checkCanBeDeclaredWithoutInitializer(identifierLocation, identifier, &publicType);
if (checkIsValidTypeAndQualifierForArray(arrayLocation, publicType))
{
TType arrayType = TType(publicType);
unsigned int size = checkIsValidArraySize(arrayLocation, indexExpression);
arrayType.setArraySize(size);
TVariable *variable = nullptr;
declareVariable(identifierLocation, identifier, arrayType, &variable);
TIntermSymbol *symbol =
intermediate.addSymbol(0, identifier, arrayType, identifierLocation);
if (variable && symbol)
symbol->setId(variable->getUniqueId());
declarationOut->appendDeclarator(symbol);
}
}
void TParseContext::parseInitDeclarator(const TPublicType &publicType,
const TSourceLoc &identifierLocation,
const TString &identifier,
const TSourceLoc &initLocation,
TIntermTyped *initializer,
TIntermDeclaration *declarationOut)
{
// If the declaration starting this declarator list was empty (example: int,), some checks were
// not performed.
if (mDeferredNonEmptyDeclarationErrorCheck)
{
nonEmptyDeclarationErrorCheck(publicType, identifierLocation);
mDeferredNonEmptyDeclarationErrorCheck = false;
}
checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
TIntermBinary *initNode = nullptr;
if (!executeInitializer(identifierLocation, identifier, publicType, initializer, &initNode))
{
//
// build the intermediate representation
//
if (initNode)
{
declarationOut->appendDeclarator(initNode);
}
}
}
void TParseContext::parseArrayInitDeclarator(const TPublicType &publicType,
const TSourceLoc &identifierLocation,
const TString &identifier,
const TSourceLoc &indexLocation,
TIntermTyped *indexExpression,
const TSourceLoc &initLocation,
TIntermTyped *initializer,
TIntermDeclaration *declarationOut)
{
// If the declaration starting this declarator list was empty (example: int,), some checks were
// not performed.
if (mDeferredNonEmptyDeclarationErrorCheck)
{
nonEmptyDeclarationErrorCheck(publicType, identifierLocation);
mDeferredNonEmptyDeclarationErrorCheck = false;
}
checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
checkIsValidTypeAndQualifierForArray(indexLocation, publicType);
TPublicType arrayType(publicType);
unsigned int size = 0u;
// If indexExpression is nullptr, then the array will eventually get its size implicitly from
// the initializer.
if (indexExpression != nullptr)
{
size = checkIsValidArraySize(identifierLocation, indexExpression);
}
// Make the type an array even if size check failed.
// This ensures useless error messages regarding the variable's non-arrayness won't follow.
arrayType.setArraySize(size);
// initNode will correspond to the whole of "b[n] = initializer".
TIntermBinary *initNode = nullptr;
if (!executeInitializer(identifierLocation, identifier, arrayType, initializer, &initNode))
{
if (initNode)
{
declarationOut->appendDeclarator(initNode);
}
}
}
void TParseContext::parseGlobalLayoutQualifier(const TTypeQualifierBuilder &typeQualifierBuilder)
{
TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(mDiagnostics);
const TLayoutQualifier layoutQualifier = typeQualifier.layoutQualifier;
checkInvariantVariableQualifier(typeQualifier.invariant, typeQualifier.qualifier,
typeQualifier.line);
// It should never be the case, but some strange parser errors can send us here.
if (layoutQualifier.isEmpty())
{
error(typeQualifier.line, "Error during layout qualifier parsing.", "?");
return;
}
if (!layoutQualifier.isCombinationValid())
{
error(typeQualifier.line, "invalid layout qualifier combination", "layout");
return;
}
checkBindingIsNotSpecified(typeQualifier.line, layoutQualifier.binding);
checkMemoryQualifierIsNotSpecified(typeQualifier.memoryQualifier, typeQualifier.line);
checkInternalFormatIsNotSpecified(typeQualifier.line, layoutQualifier.imageInternalFormat);
checkYuvIsNotSpecified(typeQualifier.line, layoutQualifier.yuv);
if (typeQualifier.qualifier == EvqComputeIn)
{
if (mComputeShaderLocalSizeDeclared &&
!layoutQualifier.isLocalSizeEqual(mComputeShaderLocalSize))
{
error(typeQualifier.line, "Work group size does not match the previous declaration",
"layout");
return;
}
if (mShaderVersion < 310)
{
error(typeQualifier.line, "in type qualifier supported in GLSL ES 3.10 only", "layout");
return;
}
if (!layoutQualifier.localSize.isAnyValueSet())
{
error(typeQualifier.line, "No local work group size specified", "layout");
return;
}
const TVariable *maxComputeWorkGroupSize = static_cast<const TVariable *>(
symbolTable.findBuiltIn("gl_MaxComputeWorkGroupSize", mShaderVersion));
const TConstantUnion *maxComputeWorkGroupSizeData =
maxComputeWorkGroupSize->getConstPointer();
for (size_t i = 0u; i < layoutQualifier.localSize.size(); ++i)
{
if (layoutQualifier.localSize[i] != -1)
{
mComputeShaderLocalSize[i] = layoutQualifier.localSize[i];
const int maxComputeWorkGroupSizeValue = maxComputeWorkGroupSizeData[i].getIConst();
if (mComputeShaderLocalSize[i] < 1 ||
mComputeShaderLocalSize[i] > maxComputeWorkGroupSizeValue)
{
std::stringstream reasonStream;
reasonStream << "invalid value: Value must be at least 1 and no greater than "
<< maxComputeWorkGroupSizeValue;
const std::string &reason = reasonStream.str();
error(typeQualifier.line, reason.c_str(), getWorkGroupSizeString(i));
return;
}
}
}
mComputeShaderLocalSizeDeclared = true;
}
else if (mMultiviewAvailable &&
(isExtensionEnabled("GL_OVR_multiview") || isExtensionEnabled("GL_OVR_multiview2")) &&
typeQualifier.qualifier == EvqVertexIn)
{
// This error is only specified in WebGL, but tightens unspecified behavior in the native
// specification.
if (mNumViews != -1 && layoutQualifier.numViews != mNumViews)
{
error(typeQualifier.line, "Number of views does not match the previous declaration",
"layout");
return;
}
if (layoutQualifier.numViews == -1)
{
error(typeQualifier.line, "No num_views specified", "layout");
return;
}
if (layoutQualifier.numViews > mMaxNumViews)
{
error(typeQualifier.line, "num_views greater than the value of GL_MAX_VIEWS_OVR",
"layout");
return;
}
mNumViews = layoutQualifier.numViews;
}
else
{
if (!checkWorkGroupSizeIsNotSpecified(typeQualifier.line, layoutQualifier))
{
return;
}
if (typeQualifier.qualifier != EvqUniform)
{
error(typeQualifier.line, "invalid qualifier: global layout must be uniform",
getQualifierString(typeQualifier.qualifier));
return;
}
if (mShaderVersion < 300)
{
error(typeQualifier.line, "layout qualifiers supported in GLSL ES 3.00 and above",
"layout");
return;
}
checkLocationIsNotSpecified(typeQualifier.line, layoutQualifier);
if (layoutQualifier.matrixPacking != EmpUnspecified)
{
mDefaultMatrixPacking = layoutQualifier.matrixPacking;
}
if (layoutQualifier.blockStorage != EbsUnspecified)
{
mDefaultBlockStorage = layoutQualifier.blockStorage;
}
}
}
TIntermFunctionPrototype *TParseContext::createPrototypeNodeFromFunction(
const TFunction &function,
const TSourceLoc &location,
bool insertParametersToSymbolTable)
{
TIntermFunctionPrototype *prototype =
new TIntermFunctionPrototype(function.getReturnType(), TSymbolUniqueId(function));
// TODO(oetuaho@nvidia.com): Instead of converting the function information here, the node could
// point to the data that already exists in the symbol table.
prototype->getFunctionSymbolInfo()->setFromFunction(function);
prototype->setLine(location);
for (size_t i = 0; i < function.getParamCount(); i++)
{
const TConstParameter &param = function.getParam(i);
// If the parameter has no name, it's not an error, just don't add it to symbol table (could
// be used for unused args).
if (param.name != nullptr)
{
TVariable *variable = new TVariable(param.name, *param.type);
// Insert the parameter in the symbol table.
if (insertParametersToSymbolTable && !symbolTable.declare(variable))
{
error(location, "redefinition", variable->getName().c_str());
prototype->appendParameter(intermediate.addSymbol(0, "", *param.type, location));
continue;
}
TIntermSymbol *symbol = intermediate.addSymbol(
variable->getUniqueId(), variable->getName(), variable->getType(), location);
prototype->appendParameter(symbol);
}
else
{
prototype->appendParameter(intermediate.addSymbol(0, "", *param.type, location));
}
}
return prototype;
}
TIntermFunctionPrototype *TParseContext::addFunctionPrototypeDeclaration(
const TFunction &parsedFunction,
const TSourceLoc &location)
{
// Note: function found from the symbol table could be the same as parsedFunction if this is the
// first declaration. Either way the instance in the symbol table is used to track whether the
// function is declared multiple times.
TFunction *function = static_cast<TFunction *>(
symbolTable.find(parsedFunction.getMangledName(), getShaderVersion()));
if (function->hasPrototypeDeclaration() && mShaderVersion == 100)
{
// ESSL 1.00.17 section 4.2.7.
// Doesn't apply to ESSL 3.00.4: see section 4.2.3.
error(location, "duplicate function prototype declarations are not allowed", "function");
}
function->setHasPrototypeDeclaration();
TIntermFunctionPrototype *prototype =
createPrototypeNodeFromFunction(*function, location, false);
symbolTable.pop();
if (!symbolTable.atGlobalLevel())
{
// ESSL 3.00.4 section 4.2.4.
error(location, "local function prototype declarations are not allowed", "function");
}
return prototype;
}
TIntermFunctionDefinition *TParseContext::addFunctionDefinition(
TIntermFunctionPrototype *functionPrototype,
TIntermBlock *functionBody,
const TSourceLoc &location)
{
// Check that non-void functions have at least one return statement.
if (mCurrentFunctionType->getBasicType() != EbtVoid && !mFunctionReturnsValue)
{
error(location, "function does not return a value:",
functionPrototype->getFunctionSymbolInfo()->getName().c_str());
}
if (functionBody == nullptr)
{
functionBody = new TIntermBlock();
functionBody->setLine(location);
}
TIntermFunctionDefinition *functionNode =
new TIntermFunctionDefinition(functionPrototype, functionBody);
functionNode->setLine(location);
symbolTable.pop();
return functionNode;
}
void TParseContext::parseFunctionDefinitionHeader(const TSourceLoc &location,
TFunction **function,
TIntermFunctionPrototype **prototypeOut)
{
ASSERT(function);
ASSERT(*function);
const TSymbol *builtIn =
symbolTable.findBuiltIn((*function)->getMangledName(), getShaderVersion());
if (builtIn)
{
error(location, "built-in functions cannot be redefined", (*function)->getName().c_str());
}
else
{
TFunction *prevDec = static_cast<TFunction *>(
symbolTable.find((*function)->getMangledName(), getShaderVersion()));
// Note: 'prevDec' could be 'function' if this is the first time we've seen function as it
// would have just been put in the symbol table. Otherwise, we're looking up an earlier
// occurance.
if (*function != prevDec)
{
// Swap the parameters of the previous declaration to the parameters of the function
// definition (parameter names may differ).
prevDec->swapParameters(**function);
// The function definition will share the same symbol as any previous declaration.
*function = prevDec;
}
if ((*function)->isDefined())
{
error(location, "function already has a body", (*function)->getName().c_str());
}
(*function)->setDefined();
}
// Remember the return type for later checking for return statements.
mCurrentFunctionType = &((*function)->getReturnType());
mFunctionReturnsValue = false;
*prototypeOut = createPrototypeNodeFromFunction(**function, location, true);
setLoopNestingLevel(0);
}
TFunction *TParseContext::parseFunctionDeclarator(const TSourceLoc &location, TFunction *function)
{
//
// We don't know at this point whether this is a function definition or a prototype.
// The definition production code will check for redefinitions.
// In the case of ESSL 1.00 the prototype production code will also check for redeclarations.
//
// Return types and parameter qualifiers must match in all redeclarations, so those are checked
// here.
//
TFunction *prevDec =
static_cast<TFunction *>(symbolTable.find(function->getMangledName(), getShaderVersion()));
if (getShaderVersion() >= 300 &&
symbolTable.hasUnmangledBuiltInForShaderVersion(function->getName().c_str(),
getShaderVersion()))
{
// With ESSL 3.00 and above, names of built-in functions cannot be redeclared as functions.
// Therefore overloading or redefining builtin functions is an error.
error(location, "Name of a built-in function cannot be redeclared as function",
function->getName().c_str());
}
else if (prevDec)
{
if (prevDec->getReturnType() != function->getReturnType())
{
error(location, "function must have the same return type in all of its declarations",
function->getReturnType().getBasicString());
}
for (size_t i = 0; i < prevDec->getParamCount(); ++i)
{
if (prevDec->getParam(i).type->getQualifier() !=
function->getParam(i).type->getQualifier())
{
error(location,
"function must have the same parameter qualifiers in all of its declarations",
function->getParam(i).type->getQualifierString());
}
}
}
//
// Check for previously declared variables using the same name.
//
TSymbol *prevSym = symbolTable.find(function->getName(), getShaderVersion());
if (prevSym)
{
if (!prevSym->isFunction())
{
error(location, "redefinition of a function", function->getName().c_str());
}
}
else
{
// Insert the unmangled name to detect potential future redefinition as a variable.
symbolTable.getOuterLevel()->insertUnmangled(function);
}
// We're at the inner scope level of the function's arguments and body statement.
// Add the function prototype to the surrounding scope instead.
symbolTable.getOuterLevel()->insert(function);
// Raise error message if main function takes any parameters or return anything other than void
if (function->getName() == "main")
{
if (function->getParamCount() > 0)
{
error(location, "function cannot take any parameter(s)", "main");
}
if (function->getReturnType().getBasicType() != EbtVoid)
{
error(location, "main function cannot return a value",
function->getReturnType().getBasicString());
}
}
//
// If this is a redeclaration, it could also be a definition, in which case, we want to use the
// variable names from this one, and not the one that's
// being redeclared. So, pass back up this declaration, not the one in the symbol table.
//
return function;
}
TFunction *TParseContext::parseFunctionHeader(const TPublicType &type,
const TString *name,
const TSourceLoc &location)
{
if (type.qualifier != EvqGlobal && type.qualifier != EvqTemporary)
{
error(location, "no qualifiers allowed for function return",
getQualifierString(type.qualifier));
}
if (!type.layoutQualifier.isEmpty())
{
error(location, "no qualifiers allowed for function return", "layout");
}
// make sure an opaque type is not involved as well...
std::string reason(getBasicString(type.getBasicType()));
reason += "s can't be function return values";
checkIsNotOpaqueType(location, type.typeSpecifierNonArray, reason.c_str());
if (mShaderVersion < 300)
{
// Array return values are forbidden, but there's also no valid syntax for declaring array
// return values in ESSL 1.00.
ASSERT(type.arraySize == 0 || mDiagnostics->numErrors() > 0);
if (type.isStructureContainingArrays())
{
// ESSL 1.00.17 section 6.1 Function Definitions
error(location, "structures containing arrays can't be function return values",
TType(type).getCompleteString().c_str());
}
}
// Add the function as a prototype after parsing it (we do not support recursion)
return new TFunction(name, new TType(type));
}
TFunction *TParseContext::addConstructorFunc(const TPublicType &publicType)
{
if (publicType.isStructSpecifier())
{
error(publicType.getLine(), "constructor can't be a structure definition",
getBasicString(publicType.getBasicType()));
}
TType *type = new TType(publicType);
if (!type->canBeConstructed())