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Allow ES version 100 to redeclare built-in functions.

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git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@23322 e7fa87d3-cd2b-0410-9028-fcbf551c1848
This commit is contained in:
John Kessenich 2013-10-02 01:30:14 +00:00
parent 447fc3613a
commit 44e8cae80a
7 changed files with 220 additions and 40 deletions
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47
glslang/MachineIndependent/ParseHelper.cpp
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@ -652,6 +652,53 @@ TIntermTyped* TParseContext::handleDotDereference(TSourceLoc loc, TIntermTyped*
return result;
}
//
// Handle seeing a function declarator in the grammar. This is the precursor
// to recognizing a function prototype or function definition.
//
TFunction* TParseContext::handleFunctionDeclarator(TSourceLoc loc, TFunction& function)
{
// ES can't declare prototypes inside functions
if (! symbolTable.atGlobalLevel())
requireProfile(loc, static_cast<EProfileMask>(~EEsProfileMask), "local function declaration");
//
// Multiple declarations of the same function are allowed.
//
// If this is a definition, the definition production code will check for redefinitions
// (we don't know at this point if it's a definition or not).
//
// Redeclarations (full prototype match) are allowed. But, return types and parameter qualifiers must match.
//
// ES does not allow redeclaring or hiding of built-in functions.
//
bool builtIn;
TSymbol* symbol = symbolTable.find(function.getMangledName(), &builtIn);
if (symbol && symbol->getAsFunction() && builtIn)
requireNotRemoved(loc, EEsProfile, 300, "redeclaration of built-in function");
const TFunction* prevDec = symbol ? symbol->getAsFunction() : 0;
if (prevDec) {
if (prevDec->getReturnType() != function.getReturnType()) {
error(loc, "overloaded functions must have the same return type", function.getReturnType().getCompleteTypeString().c_str(), "");
}
for (int i = 0; i < prevDec->getParamCount(); ++i) {
if ((*prevDec)[i].type->getQualifier().storage != function[i].type->getQualifier().storage)
error(loc, "overloaded functions must have the same parameter qualifiers", function[i].type->getStorageQualifierString(), "");
}
}
if (! symbolTable.insert(function))
error(loc, "illegal redeclaration", function.getName().c_str(), "");
//
// 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 this declaration, not the one in the symbol table.
//
return &function;
}
//
// Handle seeing a function prototype in the grammar. This includes what may
// become a full definition, as a full definition looks like a prototype