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//
//Copyright (C) 2016 Google, Inc.
//Copyright (C) 2016 LunarG, Inc.
//
//All rights reserved.
//
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions
//are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
//
// Neither the name of Google, Inc., nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
//LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
//CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
//LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
//ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
//POSSIBILITY OF SUCH DAMAGE.
//
//
// This is a set of mutually recursive methods implementing the HLSL grammar.
// Generally, each returns
// - through an argument: a type specifically appropriate to which rule it
// recognized
// - through the return value: true/false to indicate whether or not it
// recognized its rule
//
// As much as possible, only grammar recognition should happen in this file,
// with all other work being farmed out to hlslParseHelper.cpp, which in turn
// will build the AST.
//
// The next token, yet to be "accepted" is always sitting in 'token'.
// When a method says it accepts a rule, that means all tokens involved
// in the rule will have been consumed, and none left in 'token'.
//
#include "hlslTokens.h"
#include "hlslGrammar.h"
#include "hlslAttributes.h"
namespace glslang {
// Root entry point to this recursive decent parser.
// Return true if compilation unit was successfully accepted.
bool HlslGrammar::parse()
{
advanceToken();
return acceptCompilationUnit();
}
void HlslGrammar::expected(const char* syntax)
{
parseContext.error(token.loc, "Expected", syntax, "");
}
void HlslGrammar::unimplemented(const char* error)
{
parseContext.error(token.loc, "Unimplemented", error, "");
}
// Only process the next token if it is an identifier.
// Return true if it was an identifier.
bool HlslGrammar::acceptIdentifier(HlslToken& idToken)
{
if (peekTokenClass(EHTokIdentifier)) {
idToken = token;
advanceToken();
return true;
}
// Even though "sample" is a keyword (for interpolation modifiers), it IS still accepted as
// an identifier. This appears to be a solitary exception: other interp modifier keywords such
// as "linear" or "centroid" NOT valid identifiers. This code special cases "sample",
// so e.g, "int sample;" is accepted.
if (peekTokenClass(EHTokSample)) {
token.string = NewPoolTString("sample");
token.tokenClass = EHTokIdentifier;
token.symbol = nullptr;
idToken = token;
advanceToken();
return true;
}
return false;
}
// compilationUnit
// : list of externalDeclaration
// | SEMICOLONS
//
bool HlslGrammar::acceptCompilationUnit()
{
TIntermNode* unitNode = nullptr;
while (! peekTokenClass(EHTokNone)) {
// HLSL allows semicolons between global declarations, e.g, between functions.
if (acceptTokenClass(EHTokSemicolon))
continue;
// externalDeclaration
TIntermNode* declarationNode;
if (! acceptDeclaration(declarationNode))
return false;
// hook it up
unitNode = intermediate.growAggregate(unitNode, declarationNode);
}
// set root of AST
intermediate.setTreeRoot(unitNode);
return true;
}
// sampler_state
// : LEFT_BRACE [sampler_state_assignment ... ] RIGHT_BRACE
//
// sampler_state_assignment
// : sampler_state_identifier EQUAL value SEMICOLON
//
// sampler_state_identifier
// : ADDRESSU
// | ADDRESSV
// | ADDRESSW
// | BORDERCOLOR
// | FILTER
// | MAXANISOTROPY
// | MAXLOD
// | MINLOD
// | MIPLODBIAS
//
bool HlslGrammar::acceptSamplerState()
{
// TODO: this should be genericized to accept a list of valid tokens and
// return token/value pairs. Presently it is specific to texture values.
if (! acceptTokenClass(EHTokLeftBrace))
return true;
parseContext.warn(token.loc, "unimplemented", "immediate sampler state", "");
do {
// read state name
HlslToken state;
if (! acceptIdentifier(state))
break; // end of list
// FXC accepts any case
TString stateName = *state.string;
std::transform(stateName.begin(), stateName.end(), stateName.begin(), ::tolower);
if (! acceptTokenClass(EHTokAssign)) {
expected("assign");
return false;
}
if (stateName == "minlod" || stateName == "maxlod") {
if (! peekTokenClass(EHTokIntConstant)) {
expected("integer");
return false;
}
TIntermTyped* lod = nullptr;
if (! acceptLiteral(lod)) // should never fail, since we just looked for an integer
return false;
} else if (stateName == "maxanisotropy") {
if (! peekTokenClass(EHTokIntConstant)) {
expected("integer");
return false;
}
TIntermTyped* maxAnisotropy = nullptr;
if (! acceptLiteral(maxAnisotropy)) // should never fail, since we just looked for an integer
return false;
} else if (stateName == "filter") {
HlslToken filterMode;
if (! acceptIdentifier(filterMode)) {
expected("filter mode");
return false;
}
} else if (stateName == "addressu" || stateName == "addressv" || stateName == "addressw") {
HlslToken addrMode;
if (! acceptIdentifier(addrMode)) {
expected("texture address mode");
return false;
}
} else if (stateName == "miplodbias") {
TIntermTyped* lodBias = nullptr;
if (! acceptLiteral(lodBias)) {
expected("lod bias");
return false;
}
} else if (stateName == "bordercolor") {
return false;
} else {
expected("texture state");
return false;
}
// SEMICOLON
if (! acceptTokenClass(EHTokSemicolon)) {
expected("semicolon");
return false;
}
} while (true);
if (! acceptTokenClass(EHTokRightBrace))
return false;
return true;
}
// sampler_declaration_dx9
// : SAMPLER identifier EQUAL sampler_type sampler_state
//
bool HlslGrammar::acceptSamplerDeclarationDX9(TType& /*type*/)
{
if (! acceptTokenClass(EHTokSampler))
return false;
// TODO: remove this when DX9 style declarations are implemented.
unimplemented("Direct3D 9 sampler declaration");
// read sampler name
HlslToken name;
if (! acceptIdentifier(name)) {
expected("sampler name");
return false;
}
if (! acceptTokenClass(EHTokAssign)) {
expected("=");
return false;
}
return false;
}
// declaration
// : sampler_declaration_dx9 post_decls SEMICOLON
// | fully_specified_type declarator_list SEMICOLON
// | fully_specified_type identifier function_parameters post_decls compound_statement // function definition
// | fully_specified_type identifier sampler_state post_decls compound_statement // sampler definition
// | typedef declaration
//
// declarator_list
// : declarator COMMA declarator COMMA declarator... // zero or more declarators
//
// declarator
// : identifier array_specifier post_decls
// | identifier array_specifier post_decls EQUAL assignment_expression
// | identifier function_parameters post_decls // function prototype
//
// Parsing has to go pretty far in to know whether it's a variable, prototype, or
// function definition, so the implementation below doesn't perfectly divide up the grammar
// as above. (The 'identifier' in the first item in init_declarator list is the
// same as 'identifier' for function declarations.)
//
// 'node' could get populated if the declaration creates code, like an initializer
// or a function body.
//
bool HlslGrammar::acceptDeclaration(TIntermNode*& node)
{
node = nullptr;
bool list = false;
// attributes
TAttributeMap attributes;
acceptAttributes(attributes);
// typedef
bool typedefDecl = acceptTokenClass(EHTokTypedef);
TType declaredType;
// DX9 sampler declaration use a different syntax
// DX9 shaders need to run through HLSL compiler (fxc) via a back compat mode, it isn't going to
// be possible to simultaneously compile D3D10+ style shaders and DX9 shaders. If we want to compile DX9
// HLSL shaders, this will have to be a master level switch
// As such, the sampler keyword in D3D10+ turns into an automatic sampler type, and is commonly used
// For that reason, this line is commented out
// if (acceptSamplerDeclarationDX9(declaredType))
// return true;
// fully_specified_type
if (! acceptFullySpecifiedType(declaredType))
return false;
// identifier
HlslToken idToken;
while (acceptIdentifier(idToken)) {
TString* fnName = idToken.string;
// Potentially rename shader entry point function. No-op most of the time.
parseContext.renameShaderFunction(fnName);
// function_parameters
TFunction& function = *new TFunction(fnName, declaredType);
if (acceptFunctionParameters(function)) {
// post_decls
acceptPostDecls(function.getWritableType().getQualifier());
// compound_statement (function body definition) or just a prototype?
if (peekTokenClass(EHTokLeftBrace)) {
if (list)
parseContext.error(idToken.loc, "function body can't be in a declarator list", "{", "");
if (typedefDecl)
parseContext.error(idToken.loc, "function body can't be in a typedef", "{", "");
return acceptFunctionDefinition(function, node, attributes);
} else {
if (typedefDecl)
parseContext.error(idToken.loc, "function typedefs not implemented", "{", "");
parseContext.handleFunctionDeclarator(idToken.loc, function, true);
}
} else {
// A variable declaration. Fix the storage qualifier if it's a global.
if (declaredType.getQualifier().storage == EvqTemporary && parseContext.symbolTable.atGlobalLevel())
declaredType.getQualifier().storage = EvqUniform;
// We can handle multiple variables per type declaration, so
// the number of types can expand when arrayness is different.
TType variableType;
variableType.shallowCopy(declaredType);
// recognize array_specifier
TArraySizes* arraySizes = nullptr;
acceptArraySpecifier(arraySizes);
// Fix arrayness in the variableType
if (declaredType.isImplicitlySizedArray()) {
// Because "int[] a = int[2](...), b = int[3](...)" makes two arrays a and b
// of different sizes, for this case sharing the shallow copy of arrayness
// with the parseType oversubscribes it, so get a deep copy of the arrayness.
variableType.newArraySizes(declaredType.getArraySizes());
}
if (arraySizes || variableType.isArray()) {
// In the most general case, arrayness is potentially coming both from the
// declared type and from the variable: "int[] a[];" or just one or the other.
// Merge it all to the variableType, so all arrayness is part of the variableType.
parseContext.arrayDimMerge(variableType, arraySizes);
}
// samplers accept immediate sampler state
if (variableType.getBasicType() == EbtSampler) {
if (! acceptSamplerState())
return false;
}
// post_decls
acceptPostDecls(variableType.getQualifier());
// EQUAL assignment_expression
TIntermTyped* expressionNode = nullptr;
if (acceptTokenClass(EHTokAssign)) {
if (typedefDecl)
parseContext.error(idToken.loc, "can't have an initializer", "typedef", "");
if (! acceptAssignmentExpression(expressionNode)) {
expected("initializer");
return false;
}
}
// Hand off the actual declaration
// TODO: things scoped within an annotation need their own name space;
// TODO: strings are not yet handled.
if (variableType.getBasicType() != EbtString && parseContext.getAnnotationNestingLevel() == 0) {
if (typedefDecl)
parseContext.declareTypedef(idToken.loc, *idToken.string, variableType);
else if (variableType.getBasicType() == EbtBlock)
parseContext.declareBlock(idToken.loc, variableType, idToken.string);
else {
if (variableType.getQualifier().storage == EvqUniform && ! variableType.containsOpaque()) {
// this isn't really an individual variable, but a member of the $Global buffer
parseContext.growGlobalUniformBlock(idToken.loc, variableType, *idToken.string);
} else {
// Declare the variable and add any initializer code to the AST.
// The top-level node is always made into an aggregate, as that's
// historically how the AST has been.
node = intermediate.growAggregate(node,
parseContext.declareVariable(idToken.loc, *idToken.string, variableType,
expressionNode),
idToken.loc);
}
}
}
}
if (acceptTokenClass(EHTokComma)) {
list = true;
continue;
}
};
// The top-level node is a sequence.
if (node != nullptr)
node->getAsAggregate()->setOperator(EOpSequence);
// SEMICOLON
if (! acceptTokenClass(EHTokSemicolon)) {
expected(";");
return false;
}
return true;
}
// control_declaration
// : fully_specified_type identifier EQUAL expression
//
bool HlslGrammar::acceptControlDeclaration(TIntermNode*& node)
{
node = nullptr;
// fully_specified_type
TType type;
if (! acceptFullySpecifiedType(type))
return false;
// identifier
HlslToken idToken;
if (! acceptIdentifier(idToken)) {
expected("identifier");
return false;
}
// EQUAL
TIntermTyped* expressionNode = nullptr;
if (! acceptTokenClass(EHTokAssign)) {
expected("=");
return false;
}
// expression
if (! acceptExpression(expressionNode)) {
expected("initializer");
return false;
}
node = parseContext.declareVariable(idToken.loc, *idToken.string, type, expressionNode);
return true;
}
// fully_specified_type
// : type_specifier
// | type_qualifier type_specifier
//
bool HlslGrammar::acceptFullySpecifiedType(TType& type)
{
// type_qualifier
TQualifier qualifier;
qualifier.clear();
if (! acceptQualifier(qualifier))
return false;
TSourceLoc loc = token.loc;
// type_specifier
if (! acceptType(type)) {
// If this is not a type, we may have inadvertently gone down a wrong path
// py parsing "sample", which can be treated like either an identifier or a
// qualifier. Back it out, if we did.
if (qualifier.sample)
recedeToken();
return false;
}
if (type.getBasicType() == EbtBlock) {
// the type was a block, which set some parts of the qualifier
parseContext.mergeQualifiers(type.getQualifier(), qualifier);
// further, it can create an anonymous instance of the block
if (peekTokenClass(EHTokSemicolon))
parseContext.declareBlock(loc, type);
} else {
// Some qualifiers are set when parsing the type. Merge those with
// whatever comes from acceptQualifier.
assert(qualifier.layoutFormat == ElfNone);
qualifier.layoutFormat = type.getQualifier().layoutFormat;
qualifier.precision = type.getQualifier().precision;
if (type.getQualifier().storage == EvqVaryingOut)
qualifier.storage = type.getQualifier().storage;
type.getQualifier() = qualifier;
}
return true;
}
// type_qualifier
// : qualifier qualifier ...
//
// Zero or more of these, so this can't return false.
//
bool HlslGrammar::acceptQualifier(TQualifier& qualifier)
{
do {
switch (peek()) {
case EHTokStatic:
qualifier.storage = parseContext.symbolTable.atGlobalLevel() ? EvqGlobal : EvqTemporary;
break;
case EHTokExtern:
// TODO: no meaning in glslang?
break;
case EHTokShared:
// TODO: hint
break;
case EHTokGroupShared:
qualifier.storage = EvqShared;
break;
case EHTokUniform:
qualifier.storage = EvqUniform;
break;
case EHTokConst:
qualifier.storage = EvqConst;
break;
case EHTokVolatile:
qualifier.volatil = true;
break;
case EHTokLinear:
qualifier.smooth = true;
break;
case EHTokCentroid:
qualifier.centroid = true;
break;
case EHTokNointerpolation:
qualifier.flat = true;
break;
case EHTokNoperspective:
qualifier.nopersp = true;
break;
case EHTokSample:
qualifier.sample = true;
break;
case EHTokRowMajor:
qualifier.layoutMatrix = ElmColumnMajor;
break;
case EHTokColumnMajor:
qualifier.layoutMatrix = ElmRowMajor;
break;
case EHTokPrecise:
qualifier.noContraction = true;
break;
case EHTokIn:
qualifier.storage = EvqIn;
break;
case EHTokOut:
qualifier.storage = EvqOut;
break;
case EHTokInOut:
qualifier.storage = EvqInOut;
break;
case EHTokLayout:
if (! acceptLayoutQualifierList(qualifier))
return false;
continue;
// GS geometries: these are specified on stage input variables, and are an error (not verified here)
// for output variables.
case EHTokPoint:
qualifier.storage = EvqIn;
if (!parseContext.handleInputGeometry(token.loc, ElgPoints))
return false;
break;
case EHTokLine:
qualifier.storage = EvqIn;
if (!parseContext.handleInputGeometry(token.loc, ElgLines))
return false;
break;
case EHTokTriangle:
qualifier.storage = EvqIn;
if (!parseContext.handleInputGeometry(token.loc, ElgTriangles))
return false;
break;
case EHTokLineAdj:
qualifier.storage = EvqIn;
if (!parseContext.handleInputGeometry(token.loc, ElgLinesAdjacency))
return false;
break;
case EHTokTriangleAdj:
qualifier.storage = EvqIn;
if (!parseContext.handleInputGeometry(token.loc, ElgTrianglesAdjacency))
return false;
break;
default:
return true;
}
advanceToken();
} while (true);
}
// layout_qualifier_list
// : LAYOUT LEFT_PAREN layout_qualifier COMMA layout_qualifier ... RIGHT_PAREN
//
// layout_qualifier
// : identifier
// | identifier EQUAL expression
//
// Zero or more of these, so this can't return false.
//
bool HlslGrammar::acceptLayoutQualifierList(TQualifier& qualifier)
{
if (! acceptTokenClass(EHTokLayout))
return false;
// LEFT_PAREN
if (! acceptTokenClass(EHTokLeftParen))
return false;
do {
// identifier
HlslToken idToken;
if (! acceptIdentifier(idToken))
break;
// EQUAL expression
if (acceptTokenClass(EHTokAssign)) {
TIntermTyped* expr;
if (! acceptConditionalExpression(expr)) {
expected("expression");
return false;
}
parseContext.setLayoutQualifier(idToken.loc, qualifier, *idToken.string, expr);
} else
parseContext.setLayoutQualifier(idToken.loc, qualifier, *idToken.string);
// COMMA
if (! acceptTokenClass(EHTokComma))
break;
} while (true);
// RIGHT_PAREN
if (! acceptTokenClass(EHTokRightParen)) {
expected(")");
return false;
}
return true;
}
// template_type
// : FLOAT
// | DOUBLE
// | INT
// | DWORD
// | UINT
// | BOOL
//
bool HlslGrammar::acceptTemplateVecMatBasicType(TBasicType& basicType)
{
switch (peek()) {
case EHTokFloat:
basicType = EbtFloat;
break;
case EHTokDouble:
basicType = EbtDouble;
break;
case EHTokInt:
case EHTokDword:
basicType = EbtInt;
break;
case EHTokUint:
basicType = EbtUint;
break;
case EHTokBool:
basicType = EbtBool;
break;
default:
return false;
}
advanceToken();
return true;
}
// vector_template_type
// : VECTOR
// | VECTOR LEFT_ANGLE template_type COMMA integer_literal RIGHT_ANGLE
//
bool HlslGrammar::acceptVectorTemplateType(TType& type)
{
if (! acceptTokenClass(EHTokVector))
return false;
if (! acceptTokenClass(EHTokLeftAngle)) {
// in HLSL, 'vector' alone means float4.
new(&type) TType(EbtFloat, EvqTemporary, 4);
return true;
}
TBasicType basicType;
if (! acceptTemplateVecMatBasicType(basicType)) {
expected("scalar type");
return false;
}
// COMMA
if (! acceptTokenClass(EHTokComma)) {
expected(",");
return false;
}
// integer
if (! peekTokenClass(EHTokIntConstant)) {
expected("literal integer");
return false;
}
TIntermTyped* vecSize;
if (! acceptLiteral(vecSize))
return false;
const int vecSizeI = vecSize->getAsConstantUnion()->getConstArray()[0].getIConst();
new(&type) TType(basicType, EvqTemporary, vecSizeI);
if (vecSizeI == 1)
type.makeVector();
if (!acceptTokenClass(EHTokRightAngle)) {
expected("right angle bracket");
return false;
}
return true;
}
// matrix_template_type
// : MATRIX
// | MATRIX LEFT_ANGLE template_type COMMA integer_literal COMMA integer_literal RIGHT_ANGLE
//
bool HlslGrammar::acceptMatrixTemplateType(TType& type)
{
if (! acceptTokenClass(EHTokMatrix))
return false;
if (! acceptTokenClass(EHTokLeftAngle)) {
// in HLSL, 'matrix' alone means float4x4.
new(&type) TType(EbtFloat, EvqTemporary, 0, 4, 4);
return true;
}
TBasicType basicType;
if (! acceptTemplateVecMatBasicType(basicType)) {
expected("scalar type");
return false;
}
// COMMA
if (! acceptTokenClass(EHTokComma)) {
expected(",");
return false;
}
// integer rows
if (! peekTokenClass(EHTokIntConstant)) {
expected("literal integer");
return false;
}
TIntermTyped* rows;
if (! acceptLiteral(rows))
return false;
// COMMA
if (! acceptTokenClass(EHTokComma)) {
expected(",");
return false;
}
// integer cols
if (! peekTokenClass(EHTokIntConstant)) {
expected("literal integer");
return false;
}
TIntermTyped* cols;
if (! acceptLiteral(cols))
return false;
new(&type) TType(basicType, EvqTemporary, 0,
rows->getAsConstantUnion()->getConstArray()[0].getIConst(),
cols->getAsConstantUnion()->getConstArray()[0].getIConst());
if (!acceptTokenClass(EHTokRightAngle)) {
expected("right angle bracket");
return false;
}
return true;
}
// layout_geometry
// : LINESTREAM
// | POINTSTREAM
// | TRIANGLESTREAM
//
bool HlslGrammar::acceptOutputPrimitiveGeometry(TLayoutGeometry& geometry)
{
// read geometry type
const EHlslTokenClass geometryType = peek();
switch (geometryType) {
case EHTokPointStream: geometry = ElgPoints; break;
case EHTokLineStream: geometry = ElgLineStrip; break;
case EHTokTriangleStream: geometry = ElgTriangleStrip; break;
default:
return false; // not a layout geometry
}
advanceToken(); // consume the layout keyword
return true;
}
// stream_out_template_type
// : output_primitive_geometry_type LEFT_ANGLE type RIGHT_ANGLE
//
bool HlslGrammar::acceptStreamOutTemplateType(TType& type, TLayoutGeometry& geometry)
{
geometry = ElgNone;
if (! acceptOutputPrimitiveGeometry(geometry))
return false;
if (! acceptTokenClass(EHTokLeftAngle))
return false;
if (! acceptType(type)) {
expected("stream output type");
return false;
}
type.getQualifier().storage = EvqVaryingOut;
if (! acceptTokenClass(EHTokRightAngle)) {
expected("right angle bracket");
return false;
}
return true;
}
// annotations
// : LEFT_ANGLE declaration SEMI_COLON ... declaration SEMICOLON RIGHT_ANGLE
//
bool HlslGrammar::acceptAnnotations(TQualifier&)
{
if (! acceptTokenClass(EHTokLeftAngle))
return false;
// note that we are nesting a name space
parseContext.nestAnnotations();
// declaration SEMI_COLON ... declaration SEMICOLON RIGHT_ANGLE
do {
// eat any extra SEMI_COLON; don't know if the grammar calls for this or not
while (acceptTokenClass(EHTokSemicolon))
;
if (acceptTokenClass(EHTokRightAngle))
break;
// declaration
TIntermNode* node;
if (! acceptDeclaration(node)) {
expected("declaration in annotation");
return false;
}
} while (true);
parseContext.unnestAnnotations();
return true;
}
// sampler_type
// : SAMPLER
// | SAMPLER1D
// | SAMPLER2D
// | SAMPLER3D
// | SAMPLERCUBE
// | SAMPLERSTATE
// | SAMPLERCOMPARISONSTATE
bool HlslGrammar::acceptSamplerType(TType& type)
{
// read sampler type
const EHlslTokenClass samplerType = peek();
// TODO: for DX9
// TSamplerDim dim = EsdNone;
bool isShadow = false;
switch (samplerType) {
case EHTokSampler: break;
case EHTokSampler1d: /*dim = Esd1D*/; break;
case EHTokSampler2d: /*dim = Esd2D*/; break;
case EHTokSampler3d: /*dim = Esd3D*/; break;
case EHTokSamplerCube: /*dim = EsdCube*/; break;
case EHTokSamplerState: break;
case EHTokSamplerComparisonState: isShadow = true; break;
default:
return false; // not a sampler declaration
}
advanceToken(); // consume the sampler type keyword
TArraySizes* arraySizes = nullptr; // TODO: array
TSampler sampler;
sampler.setPureSampler(isShadow);
type.shallowCopy(TType(sampler, EvqUniform, arraySizes));
return true;
}
// texture_type
// | BUFFER
// | TEXTURE1D
// | TEXTURE1DARRAY
// | TEXTURE2D
// | TEXTURE2DARRAY
// | TEXTURE3D
// | TEXTURECUBE
// | TEXTURECUBEARRAY
// | TEXTURE2DMS
// | TEXTURE2DMSARRAY
// | RWBUFFER
// | RWTEXTURE1D
// | RWTEXTURE1DARRAY
// | RWTEXTURE2D
// | RWTEXTURE2DARRAY
// | RWTEXTURE3D
bool HlslGrammar::acceptTextureType(TType& type)
{
const EHlslTokenClass textureType = peek();
TSamplerDim dim = EsdNone;
bool array = false;
bool ms = false;
bool image = false;
switch (textureType) {
case EHTokBuffer: dim = EsdBuffer; break;
case EHTokTexture1d: dim = Esd1D; break;
case EHTokTexture1darray: dim = Esd1D; array = true; break;
case EHTokTexture2d: dim = Esd2D; break;
case EHTokTexture2darray: dim = Esd2D; array = true; break;
case EHTokTexture3d: dim = Esd3D; break;
case EHTokTextureCube: dim = EsdCube; break;
case EHTokTextureCubearray: dim = EsdCube; array = true; break;
case EHTokTexture2DMS: dim = Esd2D; ms = true; break;
case EHTokTexture2DMSarray: dim = Esd2D; array = true; ms = true; break;
case EHTokRWBuffer: dim = EsdBuffer; image=true; break;
case EHTokRWTexture1d: dim = Esd1D; array=false; image=true; break;
case EHTokRWTexture1darray: dim = Esd1D; array=true; image=true; break;
case EHTokRWTexture2d: dim = Esd2D; array=false; image=true; break;
case EHTokRWTexture2darray: dim = Esd2D; array=true; image=true; break;
case EHTokRWTexture3d: dim = Esd3D; array=false; image=true; break;
default:
return false; // not a texture declaration
}
advanceToken(); // consume the texture object keyword
TType txType(EbtFloat, EvqUniform, 4); // default type is float4
TIntermTyped* msCount = nullptr;
// texture type: required for multisample types and RWBuffer/RWTextures!
if (acceptTokenClass(EHTokLeftAngle)) {
if (! acceptType(txType)) {
expected("scalar or vector type");
return false;
}
const TBasicType basicRetType = txType.getBasicType() ;
if (basicRetType != EbtFloat && basicRetType != EbtUint && basicRetType != EbtInt) {
unimplemented("basic type in texture");
return false;
}
// Buffers can handle small mats if they fit in 4 components
if (dim == EsdBuffer && txType.isMatrix()) {
if ((txType.getMatrixCols() * txType.getMatrixRows()) > 4) {
expected("components < 4 in matrix buffer type");
return false;
}
// TODO: except we don't handle it yet...
unimplemented("matrix type in buffer");
return false;
}
if (!txType.isScalar() && !txType.isVector()) {
expected("scalar or vector type");
return false;
}
if (ms && acceptTokenClass(EHTokComma)) {
// read sample count for multisample types, if given
if (! peekTokenClass(EHTokIntConstant)) {
expected("multisample count");
return false;
}
if (! acceptLiteral(msCount)) // should never fail, since we just found an integer
return false;
}
if (! acceptTokenClass(EHTokRightAngle)) {
expected("right angle bracket");
return false;
}
} else if (ms) {
expected("texture type for multisample");
return false;
} else if (image) {
expected("type for RWTexture/RWBuffer");
return false;
}
TArraySizes* arraySizes = nullptr;
const bool shadow = false; // declared on the sampler
TSampler sampler;
TLayoutFormat format = ElfNone;
// Buffer, RWBuffer and RWTexture (images) require a TLayoutFormat. We handle only a limit set.
if (image || dim == EsdBuffer)
format = parseContext.getLayoutFromTxType(token.loc, txType);
// Non-image Buffers are combined
if (dim == EsdBuffer && !image) {
sampler.set(txType.getBasicType(), dim, array);
} else {
// DX10 textures are separated. TODO: DX9.
if (image) {
sampler.setImage(txType.getBasicType(), dim, array, shadow, ms);
} else {
sampler.setTexture(txType.getBasicType(), dim, array, shadow, ms);
}
}
// Remember the declared vector size.
sampler.vectorSize = txType.getVectorSize();
type.shallowCopy(TType(sampler, EvqUniform, arraySizes));
type.getQualifier().layoutFormat = format;
return true;
}
// If token is for a type, update 'type' with the type information,
// and return true and advance.
// Otherwise, return false, and don't advance
bool HlslGrammar::acceptType(TType& type)
{
// Basic types for min* types, broken out here in case of future
// changes, e.g, to use native halfs.
static const TBasicType min16float_bt = EbtFloat;
static const TBasicType min10float_bt = EbtFloat;
static const TBasicType min16int_bt = EbtInt;
static const TBasicType min12int_bt = EbtInt;
static const TBasicType min16uint_bt = EbtUint;
switch (peek()) {
case EHTokVector:
return acceptVectorTemplateType(type);
break;
case EHTokMatrix:
return acceptMatrixTemplateType(type);
break;
case EHTokPointStream: // fall through
case EHTokLineStream: // ...
case EHTokTriangleStream: // ...
{
TLayoutGeometry geometry;
if (! acceptStreamOutTemplateType(type, geometry))
return false;
if (! parseContext.handleOutputGeometry(token.loc, geometry))
return false;
return true;
}
case EHTokSampler: // fall through
case EHTokSampler1d: // ...
case EHTokSampler2d: // ...
case EHTokSampler3d: // ...
case EHTokSamplerCube: // ...
case EHTokSamplerState: // ...
case EHTokSamplerComparisonState: // ...
return acceptSamplerType(type);
break;
case EHTokBuffer: // fall through
case EHTokTexture1d: // ...
case EHTokTexture1darray: // ...
case EHTokTexture2d: // ...
case EHTokTexture2darray: // ...
case EHTokTexture3d: // ...
case EHTokTextureCube: // ...
case EHTokTextureCubearray: // ...
case EHTokTexture2DMS: // ...
case EHTokTexture2DMSarray: // ...
case EHTokRWTexture1d: // ...
case EHTokRWTexture1darray: // ...
case EHTokRWTexture2d: // ...
case EHTokRWTexture2darray: // ...
case EHTokRWTexture3d: // ...
case EHTokRWBuffer: // ...
return acceptTextureType(type);
break;
case EHTokStruct:
case EHTokCBuffer:
case EHTokTBuffer:
return acceptStruct(type);
break;
case EHTokIdentifier:
// An identifier could be for a user-defined type.
// Note we cache the symbol table lookup, to save for a later rule
// when this is not a type.
token.symbol = parseContext.symbolTable.find(*token.string);
if (token.symbol && token.symbol->getAsVariable() && token.symbol->getAsVariable()->isUserType()) {
type.shallowCopy(token.symbol->getType());
advanceToken();
return true;
} else
return false;
case EHTokVoid:
new(&type) TType(EbtVoid);
break;
case EHTokString:
new(&type) TType(EbtString);
break;
case EHTokFloat:
new(&type) TType(EbtFloat);
break;
case EHTokFloat1:
new(&type) TType(EbtFloat);
type.makeVector();
break;
case EHTokFloat2:
new(&type) TType(EbtFloat, EvqTemporary, 2);
break;
case EHTokFloat3:
new(&type) TType(EbtFloat, EvqTemporary, 3);
break;
case EHTokFloat4:
new(&type) TType(EbtFloat, EvqTemporary, 4);
break;
case EHTokDouble:
new(&type) TType(EbtDouble);
break;
case EHTokDouble1:
new(&type) TType(EbtDouble);
type.makeVector();
break;
case EHTokDouble2:
new(&type) TType(EbtDouble, EvqTemporary, 2);
break;
case EHTokDouble3:
new(&type) TType(EbtDouble, EvqTemporary, 3);
break;
case EHTokDouble4:
new(&type) TType(EbtDouble, EvqTemporary, 4);
break;
case EHTokInt:
case EHTokDword:
new(&type) TType(EbtInt);
break;
case EHTokInt1:
new(&type) TType(EbtInt);
type.makeVector();
break;
case EHTokInt2:
new(&type) TType(EbtInt, EvqTemporary, 2);
break;
case EHTokInt3:
new(&type) TType(EbtInt, EvqTemporary, 3);
break;
case EHTokInt4:
new(&type) TType(EbtInt, EvqTemporary, 4);
break;
case EHTokUint:
new(&type) TType(EbtUint);
break;
case EHTokUint1:
new(&type) TType(EbtUint);
type.makeVector();
break;
case EHTokUint2:
new(&type) TType(EbtUint, EvqTemporary, 2);
break;
case EHTokUint3:
new(&type) TType(EbtUint, EvqTemporary, 3);
break;
case EHTokUint4:
new(&type) TType(EbtUint, EvqTemporary, 4);
break;
case EHTokBool:
new(&type) TType(EbtBool);
break;
case EHTokBool1:
new(&type) TType(EbtBool);
type.makeVector();
break;
case EHTokBool2:
new(&type) TType(EbtBool, EvqTemporary, 2);
break;
case EHTokBool3:
new(&type) TType(EbtBool, EvqTemporary, 3);
break;
case EHTokBool4:
new(&type) TType(EbtBool, EvqTemporary, 4);
break;
case EHTokMin16float:
new(&type) TType(min16float_bt, EvqTemporary, EpqMedium);
break;
case EHTokMin16float1:
new(&type) TType(min16float_bt, EvqTemporary, EpqMedium);
type.makeVector();
break;
case EHTokMin16float2:
new(&type) TType(min16float_bt, EvqTemporary, EpqMedium, 2);
break;
case EHTokMin16float3:
new(&type) TType(min16float_bt, EvqTemporary, EpqMedium, 3);
break;
case EHTokMin16float4:
new(&type) TType(min16float_bt, EvqTemporary, EpqMedium, 4);
break;
case EHTokMin10float:
new(&type) TType(min10float_bt, EvqTemporary, EpqMedium);
break;
case EHTokMin10float1:
new(&type) TType(min10float_bt, EvqTemporary, EpqMedium);
type.makeVector();
break;
case EHTokMin10float2:
new(&type) TType(min10float_bt, EvqTemporary, EpqMedium, 2);
break;
case EHTokMin10float3:
new(&type) TType(min10float_bt, EvqTemporary, EpqMedium, 3);
break;
case EHTokMin10float4:
new(&type) TType(min10float_bt, EvqTemporary, EpqMedium, 4);
break;
case EHTokMin16int:
new(&type) TType(min16int_bt, EvqTemporary, EpqMedium);
break;
case EHTokMin16int1:
new(&type) TType(min16int_bt, EvqTemporary, EpqMedium);
type.makeVector();
break;
case EHTokMin16int2:
new(&type) TType(min16int_bt, EvqTemporary, EpqMedium, 2);
break;
case EHTokMin16int3:
new(&type) TType(min16int_bt, EvqTemporary, EpqMedium, 3);
break;
case EHTokMin16int4:
new(&type) TType(min16int_bt, EvqTemporary, EpqMedium, 4);
break;
case EHTokMin12int:
new(&type) TType(min12int_bt, EvqTemporary, EpqMedium);
break;
case EHTokMin12int1:
new(&type) TType(min12int_bt, EvqTemporary, EpqMedium);
type.makeVector();
break;
case EHTokMin12int2:
new(&type) TType(min12int_bt, EvqTemporary, EpqMedium, 2);
break;
case EHTokMin12int3:
new(&type) TType(min12int_bt, EvqTemporary, EpqMedium, 3);
break;
case EHTokMin12int4:
new(&type) TType(min12int_bt, EvqTemporary, EpqMedium, 4);
break;
case EHTokMin16uint:
new(&type) TType(min16uint_bt, EvqTemporary, EpqMedium);
break;
case EHTokMin16uint1:
new(&type) TType(min16uint_bt, EvqTemporary, EpqMedium);
type.makeVector();
break;
case EHTokMin16uint2:
new(&type) TType(min16uint_bt, EvqTemporary, EpqMedium, 2);
break;
case EHTokMin16uint3:
new(&type) TType(min16uint_bt, EvqTemporary, EpqMedium, 3);
break;
case EHTokMin16uint4:
new(&type) TType(min16uint_bt, EvqTemporary, EpqMedium, 4);
break;
case EHTokInt1x1:
new(&type) TType(EbtInt, EvqTemporary, 0, 1, 1);
break;
case EHTokInt1x2:
new(&type) TType(EbtInt, EvqTemporary, 0, 1, 2);
break;
case EHTokInt1x3:
new(&type) TType(EbtInt, EvqTemporary, 0, 1, 3);
break;
case EHTokInt1x4:
new(&type) TType(EbtInt, EvqTemporary, 0, 1, 4);
break;
case EHTokInt2x1:
new(&type) TType(EbtInt, EvqTemporary, 0, 2, 1);
break;
case EHTokInt2x2:
new(&type) TType(EbtInt, EvqTemporary, 0, 2, 2);
break;
case EHTokInt2x3:
new(&type) TType(EbtInt, EvqTemporary, 0, 2, 3);
break;
case EHTokInt2x4:
new(&type) TType(EbtInt, EvqTemporary, 0, 2, 4);
break;
case EHTokInt3x1:
new(&type) TType(EbtInt, EvqTemporary, 0, 3, 1);
break;
case EHTokInt3x2:
new(&type) TType(EbtInt, EvqTemporary, 0, 3, 2);
break;
case EHTokInt3x3:
new(&type) TType(EbtInt, EvqTemporary, 0, 3, 3);
break;
case EHTokInt3x4:
new(&type) TType(EbtInt, EvqTemporary, 0, 3, 4);
break;
case EHTokInt4x1:
new(&type) TType(EbtInt, EvqTemporary, 0, 4, 1);
break;
case EHTokInt4x2:
new(&type) TType(EbtInt, EvqTemporary, 0, 4, 2);
break;
case EHTokInt4x3:
new(&type) TType(EbtInt, EvqTemporary, 0, 4, 3);
break;
case EHTokInt4x4:
new(&type) TType(EbtInt, EvqTemporary, 0, 4, 4);
break;
case EHTokUint1x1:
new(&type) TType(EbtUint, EvqTemporary, 0, 1, 1);
break;
case EHTokUint1x2:
new(&type) TType(EbtUint, EvqTemporary, 0, 1, 2);
break;
case EHTokUint1x3:
new(&type) TType(EbtUint, EvqTemporary, 0, 1, 3);
break;
case EHTokUint1x4:
new(&type) TType(EbtUint, EvqTemporary, 0, 1, 4);
break;
case EHTokUint2x1:
new(&type) TType(EbtUint, EvqTemporary, 0, 2, 1);
break;
case EHTokUint2x2:
new(&type) TType(EbtUint, EvqTemporary, 0, 2, 2);
break;
case EHTokUint2x3:
new(&type) TType(EbtUint, EvqTemporary, 0, 2, 3);
break;
case EHTokUint2x4:
new(&type) TType(EbtUint, EvqTemporary, 0, 2, 4);
break;
case EHTokUint3x1:
new(&type) TType(EbtUint, EvqTemporary, 0, 3, 1);
break;
case EHTokUint3x2:
new(&type) TType(EbtUint, EvqTemporary, 0, 3, 2);
break;
case EHTokUint3x3:
new(&type) TType(EbtUint, EvqTemporary, 0, 3, 3);
break;
case EHTokUint3x4:
new(&type) TType(EbtUint, EvqTemporary, 0, 3, 4);
break;
case EHTokUint4x1:
new(&type) TType(EbtUint, EvqTemporary, 0, 4, 1);
break;
case EHTokUint4x2:
new(&type) TType(EbtUint, EvqTemporary, 0, 4, 2);
break;
case EHTokUint4x3:
new(&type) TType(EbtUint, EvqTemporary, 0, 4, 3);
break;
case EHTokUint4x4:
new(&type) TType(EbtUint, EvqTemporary, 0, 4, 4);
break;
case EHTokBool1x1:
new(&type) TType(EbtBool, EvqTemporary, 0, 1, 1);
break;
case EHTokBool1x2:
new(&type) TType(EbtBool, EvqTemporary, 0, 1, 2);
break;
case EHTokBool1x3:
new(&type) TType(EbtBool, EvqTemporary, 0, 1, 3);
break;
case EHTokBool1x4:
new(&type) TType(EbtBool, EvqTemporary, 0, 1, 4);
break;
case EHTokBool2x1:
new(&type) TType(EbtBool, EvqTemporary, 0, 2, 1);
break;
case EHTokBool2x2:
new(&type) TType(EbtBool, EvqTemporary, 0, 2, 2);
break;
case EHTokBool2x3:
new(&type) TType(EbtBool, EvqTemporary, 0, 2, 3);
break;
case EHTokBool2x4:
new(&type) TType(EbtBool, EvqTemporary, 0, 2, 4);
break;
case EHTokBool3x1:
new(&type) TType(EbtBool, EvqTemporary, 0, 3, 1);
break;
case EHTokBool3x2:
new(&type) TType(EbtBool, EvqTemporary, 0, 3, 2);
break;
case EHTokBool3x3:
new(&type) TType(EbtBool, EvqTemporary, 0, 3, 3);
break;
case EHTokBool3x4:
new(&type) TType(EbtBool, EvqTemporary, 0, 3, 4);
break;
case EHTokBool4x1:
new(&type) TType(EbtBool, EvqTemporary, 0, 4, 1);
break;
case EHTokBool4x2:
new(&type) TType(EbtBool, EvqTemporary, 0, 4, 2);
break;
case EHTokBool4x3:
new(&type) TType(EbtBool, EvqTemporary, 0, 4, 3);
break;
case EHTokBool4x4:
new(&type) TType(EbtBool, EvqTemporary, 0, 4, 4);
break;
case EHTokFloat1x1:
new(&type) TType(EbtFloat, EvqTemporary, 0, 1, 1);
break;
case EHTokFloat1x2:
new(&type) TType(EbtFloat, EvqTemporary, 0, 1, 2);
break;
case EHTokFloat1x3:
new(&type) TType(EbtFloat, EvqTemporary, 0, 1, 3);
break;
case EHTokFloat1x4:
new(&type) TType(EbtFloat, EvqTemporary, 0, 1, 4);
break;
case EHTokFloat2x1:
new(&type) TType(EbtFloat, EvqTemporary, 0, 2, 1);
break;
case EHTokFloat2x2:
new(&type) TType(EbtFloat, EvqTemporary, 0, 2, 2);
break;
case EHTokFloat2x3:
new(&type) TType(EbtFloat, EvqTemporary, 0, 2, 3);
break;
case EHTokFloat2x4:
new(&type) TType(EbtFloat, EvqTemporary, 0, 2, 4);
break;
case EHTokFloat3x1:
new(&type) TType(EbtFloat, EvqTemporary, 0, 3, 1);
break;
case EHTokFloat3x2:
new(&type) TType(EbtFloat, EvqTemporary, 0, 3, 2);
break;
case EHTokFloat3x3:
new(&type) TType(EbtFloat, EvqTemporary, 0, 3, 3);
break;
case EHTokFloat3x4:
new(&type) TType(EbtFloat, EvqTemporary, 0, 3, 4);
break;
case EHTokFloat4x1:
new(&type) TType(EbtFloat, EvqTemporary, 0, 4, 1);
break;
case EHTokFloat4x2:
new(&type) TType(EbtFloat, EvqTemporary, 0, 4, 2);
break;
case EHTokFloat4x3:
new(&type) TType(EbtFloat, EvqTemporary, 0, 4, 3);
break;
case EHTokFloat4x4:
new(&type) TType(EbtFloat, EvqTemporary, 0, 4, 4);
break;
case EHTokDouble1x1:
new(&type) TType(EbtDouble, EvqTemporary, 0, 1, 1);
break;
case EHTokDouble1x2:
new(&type) TType(EbtDouble, EvqTemporary, 0, 1, 2);
break;
case EHTokDouble1x3:
new(&type) TType(EbtDouble, EvqTemporary, 0, 1, 3);
break;
case EHTokDouble1x4:
new(&type) TType(EbtDouble, EvqTemporary, 0, 1, 4);
break;
case EHTokDouble2x1:
new(&type) TType(EbtDouble, EvqTemporary, 0, 2, 1);
break;
case EHTokDouble2x2:
new(&type) TType(EbtDouble, EvqTemporary, 0, 2, 2);
break;
case EHTokDouble2x3:
new(&type) TType(EbtDouble, EvqTemporary, 0, 2, 3);
break;
case EHTokDouble2x4:
new(&type) TType(EbtDouble, EvqTemporary, 0, 2, 4);
break;
case EHTokDouble3x1:
new(&type) TType(EbtDouble, EvqTemporary, 0, 3, 1);
break;
case EHTokDouble3x2:
new(&type) TType(EbtDouble, EvqTemporary, 0, 3, 2);
break;
case EHTokDouble3x3:
new(&type) TType(EbtDouble, EvqTemporary, 0, 3, 3);
break;
case EHTokDouble3x4:
new(&type) TType(EbtDouble, EvqTemporary, 0, 3, 4);
break;
case EHTokDouble4x1:
new(&type) TType(EbtDouble, EvqTemporary, 0, 4, 1);
break;
case EHTokDouble4x2:
new(&type) TType(EbtDouble, EvqTemporary, 0, 4, 2);
break;
case EHTokDouble4x3:
new(&type) TType(EbtDouble, EvqTemporary, 0, 4, 3);
break;
case EHTokDouble4x4:
new(&type) TType(EbtDouble, EvqTemporary, 0, 4, 4);
break;
default:
return false;
}
advanceToken();
return true;
}
// struct
// : struct_type IDENTIFIER post_decls LEFT_BRACE struct_declaration_list RIGHT_BRACE
// | struct_type post_decls LEFT_BRACE struct_declaration_list RIGHT_BRACE
//
// struct_type
// : STRUCT
// | CBUFFER
// | TBUFFER
//
bool HlslGrammar::acceptStruct(TType& type)
{
// This storage qualifier will tell us whether it's an AST
// block type or just a generic structure type.
TStorageQualifier storageQualifier = EvqTemporary;
// CBUFFER
if (acceptTokenClass(EHTokCBuffer))
storageQualifier = EvqUniform;
// TBUFFER
else if (acceptTokenClass(EHTokTBuffer))
storageQualifier = EvqBuffer;
// STRUCT
else if (! acceptTokenClass(EHTokStruct))
return false;
// IDENTIFIER
TString structName = "";
if (peekTokenClass(EHTokIdentifier)) {
structName = *token.string;
advanceToken();
}
// post_decls
TQualifier postDeclQualifier;
postDeclQualifier.clear();
acceptPostDecls(postDeclQualifier);
// LEFT_BRACE
if (! acceptTokenClass(EHTokLeftBrace)) {
expected("{");
return false;
}
// struct_declaration_list
TTypeList* typeList;
if (! acceptStructDeclarationList(typeList)) {
expected("struct member declarations");
return false;
}
// RIGHT_BRACE
if (! acceptTokenClass(EHTokRightBrace)) {
expected("}");
return false;
}
// create the user-defined type
if (storageQualifier == EvqTemporary)
new(&type) TType(typeList, structName);
else {
postDeclQualifier.storage = storageQualifier;
new(&type) TType(typeList, structName, postDeclQualifier); // sets EbtBlock
}
// If it was named, which means the type can be reused later, add
// it to the symbol table. (Unless it's a block, in which
// case the name is not a type.)
if (type.getBasicType() != EbtBlock && structName.size() > 0) {
TVariable* userTypeDef = new TVariable(&structName, type, true);
if (! parseContext.symbolTable.insert(*userTypeDef))
parseContext.error(token.loc, "redefinition", structName.c_str(), "struct");
}
return true;
}
// struct_declaration_list
// : struct_declaration SEMI_COLON struct_declaration SEMI_COLON ...
//
// struct_declaration
// : fully_specified_type struct_declarator COMMA struct_declarator ...
//
// struct_declarator
// : IDENTIFIER post_decls
// | IDENTIFIER array_specifier post_decls
//
bool HlslGrammar::acceptStructDeclarationList(TTypeList*& typeList)
{
typeList = new TTypeList();
do {
// success on seeing the RIGHT_BRACE coming up
if (peekTokenClass(EHTokRightBrace))
return true;
// struct_declaration
// fully_specified_type
TType memberType;
if (! acceptFullySpecifiedType(memberType)) {
expected("member type");
return false;
}
// struct_declarator COMMA struct_declarator ...
do {
// peek IDENTIFIER
if (! peekTokenClass(EHTokIdentifier)) {
expected("member name");
return false;
}
// add it to the list of members
TTypeLoc member = { new TType(EbtVoid), token.loc };
member.type->shallowCopy(memberType);
member.type->setFieldName(*token.string);
typeList->push_back(member);
// accept IDENTIFIER
advanceToken();
// array_specifier
TArraySizes* arraySizes = nullptr;
acceptArraySpecifier(arraySizes);
if (arraySizes)
typeList->back().type->newArraySizes(*arraySizes);
acceptPostDecls(member.type->getQualifier());
// success on seeing the SEMICOLON coming up
if (peekTokenClass(EHTokSemicolon))
break;
// COMMA
if (! acceptTokenClass(EHTokComma)) {
expected(",");
return false;
}
} while (true);
// SEMI_COLON
if (! acceptTokenClass(EHTokSemicolon)) {
expected(";");
return false;
}
} while (true);
}
// function_parameters
// : LEFT_PAREN parameter_declaration COMMA parameter_declaration ... RIGHT_PAREN
// | LEFT_PAREN VOID RIGHT_PAREN
//
bool HlslGrammar::acceptFunctionParameters(TFunction& function)
{
// LEFT_PAREN
if (! acceptTokenClass(EHTokLeftParen))
return false;
// VOID RIGHT_PAREN
if (! acceptTokenClass(EHTokVoid)) {
do {
// parameter_declaration
if (! acceptParameterDeclaration(function))
break;
// COMMA
if (! acceptTokenClass(EHTokComma))
break;
} while (true);
}
// RIGHT_PAREN
if (! acceptTokenClass(EHTokRightParen)) {
expected(")");
return false;
}
return true;
}
// parameter_declaration
// : fully_specified_type post_decls
// | fully_specified_type identifier array_specifier post_decls
//
bool HlslGrammar::acceptParameterDeclaration(TFunction& function)
{
// fully_specified_type
TType* type = new TType;
if (! acceptFullySpecifiedType(*type))
return false;
// identifier
HlslToken idToken;
acceptIdentifier(idToken);
// array_specifier
TArraySizes* arraySizes = nullptr;
acceptArraySpecifier(arraySizes);
if (arraySizes) {
if (arraySizes->isImplicit()) {
parseContext.error(token.loc, "function parameter array cannot be implicitly sized", "", "");
return false;
}
type->newArraySizes(*arraySizes);
}
// post_decls
acceptPostDecls(type->getQualifier());
parseContext.paramFix(*type);
TParameter param = { idToken.string, type };
function.addParameter(param);
return true;
}
// Do the work to create the function definition in addition to
// parsing the body (compound_statement).
bool HlslGrammar::acceptFunctionDefinition(TFunction& function, TIntermNode*& node, const TAttributeMap& attributes)
{
TFunction& functionDeclarator = parseContext.handleFunctionDeclarator(token.loc, function, false /* not prototype */);
TSourceLoc loc = token.loc;
// This does a pushScope()
node = parseContext.handleFunctionDefinition(loc, functionDeclarator, attributes);
// compound_statement
TIntermNode* functionBody = nullptr;
if (acceptCompoundStatement(functionBody)) {
parseContext.handleFunctionBody(loc, functionDeclarator, functionBody, node);
return true;
}
return false;
}
// Accept an expression with parenthesis around it, where
// the parenthesis ARE NOT expression parenthesis, but the
// syntactically required ones like in "if ( expression )".
//
// Also accepts a declaration expression; "if (int a = expression)".
//
// Note this one is not set up to be speculative; as it gives
// errors if not found.
//
bool HlslGrammar::acceptParenExpression(TIntermTyped*& expression)
{
// LEFT_PAREN
if (! acceptTokenClass(EHTokLeftParen))
expected("(");
bool decl = false;
TIntermNode* declNode = nullptr;
decl = acceptControlDeclaration(declNode);
if (decl) {
if (declNode == nullptr || declNode->getAsTyped() == nullptr) {
expected("initialized declaration");
return false;
} else
expression = declNode->getAsTyped();
} else {
// no declaration
if (! acceptExpression(expression)) {
expected("expression");
return false;
}
}
// RIGHT_PAREN
if (! acceptTokenClass(EHTokRightParen))
expected(")");
return true;
}
// The top-level full expression recognizer.
//
// expression
// : assignment_expression COMMA assignment_expression COMMA assignment_expression ...
//
bool HlslGrammar::acceptExpression(TIntermTyped*& node)
{
node = nullptr;
// assignment_expression
if (! acceptAssignmentExpression(node))
return false;
if (! peekTokenClass(EHTokComma))
return true;
do {
// ... COMMA
TSourceLoc loc = token.loc;
advanceToken();
// ... assignment_expression
TIntermTyped* rightNode = nullptr;
if (! acceptAssignmentExpression(rightNode)) {
expected("assignment expression");
return false;
}
node = intermediate.addComma(node, rightNode, loc);
if (! peekTokenClass(EHTokComma))
return true;
} while (true);
}
// initializer
// : LEFT_BRACE RIGHT_BRACE
// | LEFT_BRACE initializer_list RIGHT_BRACE
//
// initializer_list
// : assignment_expression COMMA assignment_expression COMMA ...
//
bool HlslGrammar::acceptInitializer(TIntermTyped*& node)
{
// LEFT_BRACE
if (! acceptTokenClass(EHTokLeftBrace))
return false;
// RIGHT_BRACE
TSourceLoc loc = token.loc;
if (acceptTokenClass(EHTokRightBrace)) {
// a zero-length initializer list
node = intermediate.makeAggregate(loc);
return true;
}
// initializer_list
node = nullptr;
do {
// assignment_expression
TIntermTyped* expr;
if (! acceptAssignmentExpression(expr)) {
expected("assignment expression in initializer list");
return false;
}
node = intermediate.growAggregate(node, expr, loc);
// COMMA
if (acceptTokenClass(EHTokComma)) {
if (acceptTokenClass(EHTokRightBrace)) // allow trailing comma
return true;
continue;
}
// RIGHT_BRACE
if (acceptTokenClass(EHTokRightBrace))
return true;
expected(", or }");
return false;
} while (true);
}
// Accept an assignment expression, where assignment operations
// associate right-to-left. That is, it is implicit, for example
//
// a op (b op (c op d))
//
// assigment_expression
// : initializer
// | conditional_expression
// | conditional_expression assign_op conditional_expression assign_op conditional_expression ...
//
bool HlslGrammar::acceptAssignmentExpression(TIntermTyped*& node)
{
// initializer
if (peekTokenClass(EHTokLeftBrace)) {
if (acceptInitializer(node))
return true;
expected("initializer");
return false;
}
// conditional_expression
if (! acceptConditionalExpression(node))
return false;
// assignment operation?
TOperator assignOp = HlslOpMap::assignment(peek());
if (assignOp == EOpNull)
return true;
// assign_op
TSourceLoc loc = token.loc;
advanceToken();
// conditional_expression assign_op conditional_expression ...
// Done by recursing this function, which automatically
// gets the right-to-left associativity.
TIntermTyped* rightNode = nullptr;
if (! acceptAssignmentExpression(rightNode)) {
expected("assignment expression");
return false;
}
node = parseContext.handleAssign(loc, assignOp, node, rightNode);
node = parseContext.handleLvalue(loc, "assign", node);
if (node == nullptr) {
parseContext.error(loc, "could not create assignment", "", "");
return false;
}
if (! peekTokenClass(EHTokComma))
return true;
return true;
}
// Accept a conditional expression, which associates right-to-left,
// accomplished by the "true" expression calling down to lower
// precedence levels than this level.
//
// conditional_expression
// : binary_expression
// | binary_expression QUESTION expression COLON assignment_expression
//
bool HlslGrammar::acceptConditionalExpression(TIntermTyped*& node)
{
// binary_expression
if (! acceptBinaryExpression(node, PlLogicalOr))
return false;
if (! acceptTokenClass(EHTokQuestion))
return true;
TIntermTyped* trueNode = nullptr;
if (! acceptExpression(trueNode)) {
expected("expression after ?");
return false;
}
TSourceLoc loc = token.loc;
if (! acceptTokenClass(EHTokColon)) {
expected(":");
return false;
}
TIntermTyped* falseNode = nullptr;
if (! acceptAssignmentExpression(falseNode)) {
expected("expression after :");
return false;
}
node = intermediate.addSelection(node, trueNode, falseNode, loc);
return true;
}
// Accept a binary expression, for binary operations that
// associate left-to-right. This is, it is implicit, for example
//
// ((a op b) op c) op d
//
// binary_expression
// : expression op expression op expression ...
//
// where 'expression' is the next higher level in precedence.
//
bool HlslGrammar::acceptBinaryExpression(TIntermTyped*& node, PrecedenceLevel precedenceLevel)
{
if (precedenceLevel > PlMul)
return acceptUnaryExpression(node);
// assignment_expression
if (! acceptBinaryExpression(node, (PrecedenceLevel)(precedenceLevel + 1)))
return false;
do {
TOperator op = HlslOpMap::binary(peek());
PrecedenceLevel tokenLevel = HlslOpMap::precedenceLevel(op);
if (tokenLevel < precedenceLevel)
return true;
// ... op
TSourceLoc loc = token.loc;
advanceToken();
// ... expression
TIntermTyped* rightNode = nullptr;
if (! acceptBinaryExpression(rightNode, (PrecedenceLevel)(precedenceLevel + 1))) {
expected("expression");
return false;
}
node = intermediate.addBinaryMath(op, node, rightNode, loc);
if (node == nullptr) {
parseContext.error(loc, "Could not perform requested binary operation", "", "");
return false;
}
} while (true);
}
// unary_expression
// : (type) unary_expression
// | + unary_expression
// | - unary_expression
// | ! unary_expression
// | ~ unary_expression
// | ++ unary_expression
// | -- unary_expression
// | postfix_expression
//
bool HlslGrammar::acceptUnaryExpression(TIntermTyped*& node)
{
// (type) unary_expression
// Have to look two steps ahead, because this could be, e.g., a
// postfix_expression instead, since that also starts with at "(".
if (acceptTokenClass(EHTokLeftParen)) {
TType castType;
if (acceptType(castType)) {
if (acceptTokenClass(EHTokRightParen)) {
// We've matched "(type)" now, get the expression to cast
TSourceLoc loc = token.loc;
if (! acceptUnaryExpression(node))
return false;
// Hook it up like a constructor
TFunction* constructorFunction = parseContext.handleConstructorCall(loc, castType);
if (constructorFunction == nullptr) {
expected("type that can be constructed");
return false;
}
TIntermTyped* arguments = nullptr;
parseContext.handleFunctionArgument(constructorFunction, arguments, node);
node = parseContext.handleFunctionCall(loc, constructorFunction, arguments);
return true;
} else {
// This could be a parenthesized constructor, ala (int(3)), and we just accepted
// the '(int' part. We must back up twice.
recedeToken();
recedeToken();
}
} else {
// This isn't a type cast, but it still started "(", so if it is a
// unary expression, it can only be a postfix_expression, so try that.
// Back it up first.
recedeToken();
return acceptPostfixExpression(node);
}
}
// peek for "op unary_expression"
TOperator unaryOp = HlslOpMap::preUnary(peek());
// postfix_expression (if no unary operator)
if (unaryOp == EOpNull)
return acceptPostfixExpression(node);
// op unary_expression
TSourceLoc loc = token.loc;
advanceToken();
if (! acceptUnaryExpression(node))
return false;
// + is a no-op
if (unaryOp == EOpAdd)
return true;
node = intermediate.addUnaryMath(unaryOp, node, loc);
// These unary ops require lvalues
if (unaryOp == EOpPreIncrement || unaryOp == EOpPreDecrement)
node = parseContext.handleLvalue(loc, "unary operator", node);
return node != nullptr;
}
// postfix_expression
// : LEFT_PAREN expression RIGHT_PAREN
// | literal
// | constructor
// | identifier
// | function_call
// | postfix_expression LEFT_BRACKET integer_expression RIGHT_BRACKET
// | postfix_expression DOT IDENTIFIER
// | postfix_expression INC_OP
// | postfix_expression DEC_OP
//
bool HlslGrammar::acceptPostfixExpression(TIntermTyped*& node)
{
// Not implemented as self-recursive:
// The logical "right recursion" is done with an loop at the end
// idToken will pick up either a variable or a function name in a function call
HlslToken idToken;
// Find something before the postfix operations, as they can't operate
// on nothing. So, no "return true", they fall through, only "return false".
if (acceptTokenClass(EHTokLeftParen)) {
// LEFT_PAREN expression RIGHT_PAREN
if (! acceptExpression(node)) {
expected("expression");
return false;
}
if (! acceptTokenClass(EHTokRightParen)) {
expected(")");
return false;
}
} else if (acceptLiteral(node)) {
// literal (nothing else to do yet), go on to the
} else if (acceptConstructor(node)) {
// constructor (nothing else to do yet)
} else if (acceptIdentifier(idToken)) {
// identifier or function_call name
if (! peekTokenClass(EHTokLeftParen)) {
node = parseContext.handleVariable(idToken.loc, idToken.symbol, idToken.string);
} else if (acceptFunctionCall(idToken, node)) {
// function_call (nothing else to do yet)
} else {
expected("function call arguments");
return false;
}
} else {
// nothing found, can't post operate
return false;
}
// This is to guarantee we do this no matter how we get out of the stack frame.
// This way there's no bug if an early return forgets to do it.
struct tFinalize {
tFinalize(HlslParseContext& p) : parseContext(p) { }
~tFinalize() { parseContext.finalizeFlattening(); }
HlslParseContext& parseContext;
} finalize(parseContext);
// Initialize the flattening accumulation data, so we can track data across multiple bracket or
// dot operators. This can also be nested, e.g, for [], so we have to track each nesting
// level: hence the init and finalize. Even though in practice these must be
// constants, they are parsed no matter what.
parseContext.initFlattening();
// Something was found, chain as many postfix operations as exist.
do {
TSourceLoc loc = token.loc;
TOperator postOp = HlslOpMap::postUnary(peek());
// Consume only a valid post-unary operator, otherwise we are done.
switch (postOp) {
case EOpIndexDirectStruct:
case EOpIndexIndirect:
case EOpPostIncrement:
case EOpPostDecrement:
advanceToken();
break;
default:
return true;
}
// We have a valid post-unary operator, process it.
switch (postOp) {
case EOpIndexDirectStruct:
{
// DOT IDENTIFIER
// includes swizzles and struct members
HlslToken field;
if (! acceptIdentifier(field)) {
expected("swizzle or member");
return false;
}
TIntermTyped* base = node; // preserve for method function calls
node = parseContext.handleDotDereference(field.loc, node, *field.string);
// In the event of a method node, we look for an open paren and accept the function call.
if (node != nullptr && node->getAsMethodNode() != nullptr && peekTokenClass(EHTokLeftParen)) {
if (! acceptFunctionCall(field, node, base)) {
expected("function parameters");
return false;
}
}
break;
}
case EOpIndexIndirect:
{
// LEFT_BRACKET integer_expression RIGHT_BRACKET
TIntermTyped* indexNode = nullptr;
if (! acceptExpression(indexNode) ||
! peekTokenClass(EHTokRightBracket)) {
expected("expression followed by ']'");
return false;
}
advanceToken();
node = parseContext.handleBracketDereference(indexNode->getLoc(), node, indexNode);
break;
}
case EOpPostIncrement:
// INC_OP
// fall through
case EOpPostDecrement:
// DEC_OP
node = intermediate.addUnaryMath(postOp, node, loc);
node = parseContext.handleLvalue(loc, "unary operator", node);
break;
default:
assert(0);
break;
}
} while (true);
}
// constructor
// : type argument_list
//
bool HlslGrammar::acceptConstructor(TIntermTyped*& node)
{
// type
TType type;
if (acceptType(type)) {
TFunction* constructorFunction = parseContext.handleConstructorCall(token.loc, type);
if (constructorFunction == nullptr)
return false;
// arguments
TIntermTyped* arguments = nullptr;
if (! acceptArguments(constructorFunction, arguments)) {
expected("constructor arguments");
return false;
}
// hook it up
node = parseContext.handleFunctionCall(arguments->getLoc(), constructorFunction, arguments);
return true;
}
return false;
}
// The function_call identifier was already recognized, and passed in as idToken.
//
// function_call
// : [idToken] arguments
//
bool HlslGrammar::acceptFunctionCall(HlslToken idToken, TIntermTyped*& node, TIntermTyped* base)
{
// arguments
TFunction* function = new TFunction(idToken.string, TType(EbtVoid));
TIntermTyped* arguments = nullptr;
// methods have an implicit first argument of the calling object.
if (base != nullptr)
parseContext.handleFunctionArgument(function, arguments, base);
if (! acceptArguments(function, arguments))
return false;
node = parseContext.handleFunctionCall(idToken.loc, function, arguments);
return true;
}
// arguments
// : LEFT_PAREN expression COMMA expression COMMA ... RIGHT_PAREN
//
// The arguments are pushed onto the 'function' argument list and
// onto the 'arguments' aggregate.
//
bool HlslGrammar::acceptArguments(TFunction* function, TIntermTyped*& arguments)
{
// LEFT_PAREN
if (! acceptTokenClass(EHTokLeftParen))
return false;
do {
// expression
TIntermTyped* arg;
if (! acceptAssignmentExpression(arg))
break;
// hook it up
parseContext.handleFunctionArgument(function, arguments, arg);
// COMMA
if (! acceptTokenClass(EHTokComma))
break;
} while (true);
// RIGHT_PAREN
if (! acceptTokenClass(EHTokRightParen)) {
expected(")");
return false;
}
return true;
}
bool HlslGrammar::acceptLiteral(TIntermTyped*& node)
{
switch (token.tokenClass) {
case EHTokIntConstant:
node = intermediate.addConstantUnion(token.i, token.loc, true);
break;
case EHTokUintConstant:
node = intermediate.addConstantUnion(token.u, token.loc, true);
break;
case EHTokFloatConstant:
node = intermediate.addConstantUnion(token.d, EbtFloat, token.loc, true);
break;
case EHTokDoubleConstant:
node = intermediate.addConstantUnion(token.d, EbtDouble, token.loc, true);
break;
case EHTokBoolConstant:
node = intermediate.addConstantUnion(token.b, token.loc, true);
break;
case EHTokStringConstant:
node = nullptr;
break;
default:
return false;
}
advanceToken();
return true;
}
// compound_statement
// : LEFT_CURLY statement statement ... RIGHT_CURLY
//
bool HlslGrammar::acceptCompoundStatement(TIntermNode*& retStatement)
{
TIntermAggregate* compoundStatement = nullptr;
// LEFT_CURLY
if (! acceptTokenClass(EHTokLeftBrace))
return false;
// statement statement ...
TIntermNode* statement = nullptr;
while (acceptStatement(statement)) {
TIntermBranch* branch = statement ? statement->getAsBranchNode() : nullptr;
if (branch != nullptr && (branch->getFlowOp() == EOpCase ||
branch->getFlowOp() == EOpDefault)) {
// hook up individual subsequences within a switch statement
parseContext.wrapupSwitchSubsequence(compoundStatement, statement);
compoundStatement = nullptr;
} else {
// hook it up to the growing compound statement
compoundStatement = intermediate.growAggregate(compoundStatement, statement);
}
}
if (compoundStatement)
compoundStatement->setOperator(EOpSequence);
retStatement = compoundStatement;
// RIGHT_CURLY
return acceptTokenClass(EHTokRightBrace);
}
bool HlslGrammar::acceptScopedStatement(TIntermNode*& statement)
{
parseContext.pushScope();
bool result = acceptStatement(statement);
parseContext.popScope();
return result;
}
bool HlslGrammar::acceptScopedCompoundStatement(TIntermNode*& statement)
{
parseContext.pushScope();
bool result = acceptCompoundStatement(statement);
parseContext.popScope();
return result;
}
// statement
// : attributes attributed_statement
//
// attributed_statement
// : compound_statement
// | SEMICOLON
// | expression SEMICOLON
// | declaration_statement
// | selection_statement
// | switch_statement
// | case_label
// | iteration_statement
// | jump_statement
//
bool HlslGrammar::acceptStatement(TIntermNode*& statement)
{
statement = nullptr;
// attributes
TAttributeMap attributes;
acceptAttributes(attributes);
// attributed_statement
switch (peek()) {
case EHTokLeftBrace:
return acceptScopedCompoundStatement(statement);
case EHTokIf:
return acceptSelectionStatement(statement);
case EHTokSwitch:
return acceptSwitchStatement(statement);
case EHTokFor:
case EHTokDo:
case EHTokWhile:
return acceptIterationStatement(statement);
case EHTokContinue:
case EHTokBreak:
case EHTokDiscard:
case EHTokReturn:
return acceptJumpStatement(statement);
case EHTokCase:
return acceptCaseLabel(statement);
case EHTokDefault:
return acceptDefaultLabel(statement);
case EHTokSemicolon:
return acceptTokenClass(EHTokSemicolon);
case EHTokRightBrace:
// Performance: not strictly necessary, but stops a bunch of hunting early,
// and is how sequences of statements end.
return false;
default:
{
// declaration
if (acceptDeclaration(statement))
return true;
// expression
TIntermTyped* node;
if (acceptExpression(node))
statement = node;
else
return false;
// SEMICOLON (following an expression)
if (! acceptTokenClass(EHTokSemicolon)) {
expected(";");
return false;
}
}
}
return true;
}
// attributes
// : list of zero or more of: LEFT_BRACKET attribute RIGHT_BRACKET
//
// attribute:
// : UNROLL
// | UNROLL LEFT_PAREN literal RIGHT_PAREN
// | FASTOPT
// | ALLOW_UAV_CONDITION
// | BRANCH
// | FLATTEN
// | FORCECASE
// | CALL
// | DOMAIN
// | EARLYDEPTHSTENCIL
// | INSTANCE
// | MAXTESSFACTOR
// | OUTPUTCONTROLPOINTS
// | OUTPUTTOPOLOGY
// | PARTITIONING
// | PATCHCONSTANTFUNC
// | NUMTHREADS LEFT_PAREN x_size, y_size,z z_size RIGHT_PAREN
//
void HlslGrammar::acceptAttributes(TAttributeMap& attributes)
{
// For now, accept the [ XXX(X) ] syntax, but drop all but
// numthreads, which is used to set the CS local size.
// TODO: subset to correct set? Pass on?
do {
HlslToken idToken;
// LEFT_BRACKET?
if (! acceptTokenClass(EHTokLeftBracket))
return;
// attribute
if (acceptIdentifier(idToken)) {
// 'idToken.string' is the attribute
} else if (! peekTokenClass(EHTokRightBracket)) {
expected("identifier");
advanceToken();
}
TIntermAggregate* expressions = nullptr;
// (x, ...)
if (acceptTokenClass(EHTokLeftParen)) {
expressions = new TIntermAggregate;
TIntermTyped* node;
bool expectingExpression = false;
while (acceptAssignmentExpression(node)) {
expectingExpression = false;
expressions->getSequence().push_back(node);
if (acceptTokenClass(EHTokComma))
expectingExpression = true;
}
// 'expressions' is an aggregate with the expressions in it
if (! acceptTokenClass(EHTokRightParen))
expected(")");
// Error for partial or missing expression
if (expectingExpression || expressions->getSequence().empty())
expected("expression");
}
// RIGHT_BRACKET
if (!acceptTokenClass(EHTokRightBracket)) {
expected("]");
return;
}
// Add any values we found into the attribute map. This accepts
// (and ignores) values not mapping to a known TAttributeType;
attributes.setAttribute(idToken.string, expressions);
} while (true);
}
// selection_statement
// : IF LEFT_PAREN expression RIGHT_PAREN statement
// : IF LEFT_PAREN expression RIGHT_PAREN statement ELSE statement
//
bool HlslGrammar::acceptSelectionStatement(TIntermNode*& statement)
{
TSourceLoc loc = token.loc;
// IF
if (! acceptTokenClass(EHTokIf))
return false;
// so that something declared in the condition is scoped to the lifetimes
// of the then-else statements
parseContext.pushScope();
// LEFT_PAREN expression RIGHT_PAREN
TIntermTyped* condition;
if (! acceptParenExpression(condition))
return false;
// create the child statements
TIntermNodePair thenElse = { nullptr, nullptr };
// then statement
if (! acceptScopedStatement(thenElse.node1)) {
expected("then statement");
return false;
}
// ELSE
if (acceptTokenClass(EHTokElse)) {
// else statement
if (! acceptScopedStatement(thenElse.node2)) {
expected("else statement");
return false;
}
}
// Put the pieces together
statement = intermediate.addSelection(condition, thenElse, loc);
parseContext.popScope();
return true;
}
// switch_statement
// : SWITCH LEFT_PAREN expression RIGHT_PAREN compound_statement
//
bool HlslGrammar::acceptSwitchStatement(TIntermNode*& statement)
{
// SWITCH
TSourceLoc loc = token.loc;
if (! acceptTokenClass(EHTokSwitch))
return false;
// LEFT_PAREN expression RIGHT_PAREN
parseContext.pushScope();
TIntermTyped* switchExpression;
if (! acceptParenExpression(switchExpression)) {
parseContext.popScope();
return false;
}
// compound_statement
parseContext.pushSwitchSequence(new TIntermSequence);
bool statementOkay = acceptCompoundStatement(statement);
if (statementOkay)
statement = parseContext.addSwitch(loc, switchExpression, statement ? statement->getAsAggregate() : nullptr);
parseContext.popSwitchSequence();
parseContext.popScope();
return statementOkay;
}
// iteration_statement
// : WHILE LEFT_PAREN condition RIGHT_PAREN statement
// | DO LEFT_BRACE statement RIGHT_BRACE WHILE LEFT_PAREN expression RIGHT_PAREN SEMICOLON
// | FOR LEFT_PAREN for_init_statement for_rest_statement RIGHT_PAREN statement
//
// Non-speculative, only call if it needs to be found; WHILE or DO or FOR already seen.
bool HlslGrammar::acceptIterationStatement(TIntermNode*& statement)
{
TSourceLoc loc = token.loc;
TIntermTyped* condition = nullptr;
EHlslTokenClass loop = peek();
assert(loop == EHTokDo || loop == EHTokFor || loop == EHTokWhile);
// WHILE or DO or FOR
advanceToken();
switch (loop) {
case EHTokWhile:
// so that something declared in the condition is scoped to the lifetime
// of the while sub-statement
parseContext.pushScope();
parseContext.nestLooping();
// LEFT_PAREN condition RIGHT_PAREN
if (! acceptParenExpression(condition))
return false;
// statement
if (! acceptScopedStatement(statement)) {
expected("while sub-statement");
return false;
}
parseContext.unnestLooping();
parseContext.popScope();
statement = intermediate.addLoop(statement, condition, nullptr, true, loc);