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HLSL: Accept basic funtion definitions. (Not yet mapping input/output for entry point.)

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This commit is contained in:
John Kessenich
2016-03-13 17:58:25 -06:00
parent 48882ef5a8
commit 5f934b039a
4 changed files with 240 additions and 76 deletions
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231
hlsl/hlslGrammar.cpp
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@@ -110,12 +110,12 @@ bool HlslGrammar::acceptCompilationUnit()
}
// declaration
// : SEMICOLON
// : ;
// : fully_specified_type ;
// | fully_specified_type identifier ;
// | fully_specified_type identifier = expression ;
// | fully_specified_type identifier function_parameters ; // function prototype
// | fully_specified_type function_parameters compound_statement // function definition
// | fully_specified_type identifier function_parameters ; // function prototype
// | fully_specified_type identifier function_parameters : semantic compound_statement // function definition
//
// 'node' could get created if the declaration creates code, like an initializer
// or a function body.
@@ -149,9 +149,34 @@ bool HlslGrammar::acceptDeclaration(TIntermNode*& node)
node = parseContext.declareVariable(declLoc, *declName, type, 0, expressionNode);
return true;
}
// function_parameters
TFunction* function = new TFunction(declName, type);
if (acceptFunctionParameters(*function)) {
// :
if (acceptTokenClass(EHTokColon)) {
// semantic
if (token.tokenClass == EHTokIdentifier) {
TString* semantic = token.string;
advanceToken();
} else {
expected("semantic");
return false;
}
}
// compound_statement
if (token.tokenClass == EHTokLeftBrace)
return acceptFunctionDefinition(*function, node);
// ;
if (acceptTokenClass(EHTokSemicolon))
return true;
return false;
}
}
// no identifier, just ;
// ; [ no identifier, just ; ]
if (acceptTokenClass(EHTokSemicolon))
return true;
@@ -281,19 +306,110 @@ bool HlslGrammar::acceptType(TType& type)
return true;
}
// function_parameters
// : ( parameter_declaration , parameter_declaration ... )
//
bool HlslGrammar::acceptFunctionParameters(TFunction& function)
{
// (
if (! acceptTokenClass(EHTokLeftParen))
return false;
do {
// parameter_declaration
if (! acceptParameterDeclaration(function))
break;
// ,
if (! acceptTokenClass(EHTokComma))
break;
} while (true);
// )
if (! acceptTokenClass(EHTokRightParen)) {
expected("right parenthesis");
return false;
}
return true;
}
// parameter_declaration
// : fully_specified_type
// | fully_specified_type identifier
//
bool HlslGrammar::acceptParameterDeclaration(TFunction& function)
{
// fully_specified_type
TType* type = new TType;
if (! acceptFullySpecifiedType(*type))
return false;
// identifier
TString name;
if (token.tokenClass == EHTokIdentifier) {
name = *token.string;
advanceToken();
}
TParameter param = { token.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)
{
TFunction* functionDeclarator = parseContext.handleFunctionDeclarator(token.loc, function, false /* not prototype */);
// This does a symbol table push
node = parseContext.handleFunctionDefinition(token.loc, *functionDeclarator);
// compound_statement
TIntermAggregate* functionBody = nullptr;
if (acceptCompoundStatement(functionBody)) {
node = parseContext.intermediate.growAggregate(node, functionBody);
parseContext.intermediate.setAggregateOperator(node, EOpFunction, functionDeclarator->getType(), token.loc);
node->getAsAggregate()->setName(functionDeclarator->getMangledName().c_str());
parseContext.symbolTable.pop(nullptr);
return true;
}
return false;
}
// expression
// : identifier
// | identifier operator identifier // to be generalized to all expressions
// | ( expression )
// | type(...) // constructor
// | literal
// | identifier operator identifier // to be generalized to all expressions
//
bool HlslGrammar::acceptExpression(TIntermTyped*& node)
{
// identifier
if (token.tokenClass == EHTokIdentifier) {
node = parseContext.handleVariable(token.loc, token.symbol, token.string);
return true;
TIntermTyped* left = parseContext.handleVariable(token.loc, token.symbol, token.string);
advanceToken();
// operator?
TOperator op;
if (! acceptOperator(op))
return true;
TSourceLoc loc = token.loc;
// identifier
if (token.tokenClass == EHTokIdentifier) {
TIntermTyped* right = parseContext.handleVariable(token.loc, token.symbol, token.string);
advanceToken();
node = parseContext.intermediate.addBinaryMath(op, left, right, loc);
return true;
}
return false;
}
// ( expression )
@@ -318,28 +434,7 @@ bool HlslGrammar::acceptExpression(TIntermTyped*& node)
if (acceptConstructor(node))
return true;
// identifier operator identifier
if (token.tokenClass == EHTokIdentifier) {
TIntermTyped* left = parseContext.handleVariable(token.loc, token.symbol, token.string);
advanceToken();
// operator
TOperator op;
if (! acceptOperator(op))
return false;
TSourceLoc loc = token.loc;
// right
if (token.tokenClass == EHTokIdentifier) {
TIntermTyped* right = parseContext.handleVariable(token.loc, token.symbol, token.string);
advanceToken();
node = parseContext.intermediate.addBinaryMath(op, left, right, loc);
} else
return false;
} else
return false;
return true;
return false;
}
// constructor
@@ -430,12 +525,26 @@ bool HlslGrammar::acceptLiteral(TIntermTyped*& node)
return true;
}
// operator
// : + | - | * | / | ...
bool HlslGrammar::acceptOperator(TOperator& op)
{
switch (token.tokenClass) {
case EHTokEqual:
op = EOpAssign;
break;
case EHTokPlus:
op = EOpAdd;
break;
case EHTokDash:
op = EOpSub;
break;
case EHTokStar:
op = EOpMul;
break;
case EHTokSlash:
op = EOpDiv;
break;
default:
return false;
}
@@ -445,9 +554,69 @@ bool HlslGrammar::acceptOperator(TOperator& op)
return true;
}
bool HlslGrammar::acceptCompoundStatement()
// compound_statement
// : { statement statement ... }
//
bool HlslGrammar::acceptCompoundStatement(TIntermAggregate*& compoundStatement)
{
return false;
// {
if (! acceptTokenClass(EHTokLeftBrace))
return false;
// statement statement ...
TIntermNode* statement = nullptr;
while (acceptStatement(statement)) {
// hook it up
compoundStatement = parseContext.intermediate.growAggregate(compoundStatement, statement);
}
compoundStatement->setOperator(EOpSequence);
// }
return acceptTokenClass(EHTokRightBrace);
}
// statement
// : compound_statement
// | return ;
// | return expression ;
// | expression ;
//
bool HlslGrammar::acceptStatement(TIntermNode*& statement)
{
// compound_statement
TIntermAggregate* compoundStatement = nullptr;
if (acceptCompoundStatement(compoundStatement)) {
statement = compoundStatement;
return true;
}
// return
if (acceptTokenClass(EHTokReturn)) {
// expression
TIntermTyped* node;
if (acceptExpression(node)) {
// hook it up
statement = parseContext.intermediate.addBranch(EOpReturn, node, token.loc);
} else
statement = parseContext.intermediate.addBranch(EOpReturn, token.loc);
// ;
if (! acceptTokenClass(EHTokSemicolon))
return false;
return true;
}
// expression
TIntermTyped* node;
if (acceptExpression(node))
statement = node;
// ;
if (! acceptTokenClass(EHTokSemicolon))
return false;
return true;
}
} // end namespace glslang