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Add #include processing to glslang (though turned off by default).

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When an include directive is recognized by the preprocessor, it
executes a callback on the filepath argument to obtain the file
contents.  That way the compilation client can deal with the file
system, include paths, etc.

Currently only accepts quoted filepaths -- no angle brackets yet.
This commit is contained in:
Dejan Mircevski 2015-06-17 11:40:33 -04:00 • committed by Lei Zhang
parent 1363fcd60b
commit 7be4b8282d
14 changed files with 142 additions and 21 deletions
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35
glslang/MachineIndependent/preprocessor/Pp.cpp
View file

@ -596,6 +596,38 @@ int TPpContext::CPPifdef(int defined, TPpToken* ppToken)
return token;
}
// Handle #include
int TPpContext::CPPinclude(TPpToken* ppToken)
{
const TSourceLoc directiveLoc = ppToken->loc;
int token = scanToken(ppToken);
if (token != PpAtomConstString) {
// TODO: handle angle brackets.
parseContext.ppError(directiveLoc, "must be followed by a file designation", "#include", "");
} else {
const char* name = GetAtomString(ppToken->atom);
token = scanToken(ppToken);
if (token != '\n' && token != EndOfInput) {
parseContext.ppError(ppToken->loc, "extra content after file designation", "#include", "");
} else {
if (!inputStack.empty()) ungetChar();
std::string replacement;
bool success;
std::tie(success, replacement) = includer.include(name);
if (success) {
pushInput(new TokenizableString(replacement, this));
// At EOF, there's no "current" location anymore.
if (token != EndOfInput) parseContext.setCurrentColumn(0);
// Don't accidentally return EndOfInput, which will end all preprocessing.
return '\n';
} else {
parseContext.ppError(ppToken->loc, "not found", name, "");
}
}
}
return token;
}
// Handle #line
int TPpContext::CPPline(TPpToken* ppToken)
{
@ -845,6 +877,9 @@ int TPpContext::readCPPline(TPpToken* ppToken)
case PpAtomIfndef:
token = CPPifdef(0, ppToken);
break;
case PpAtomInclude:
token = CPPinclude(ppToken);
break;
case PpAtomLine:
token = CPPline(ppToken);
break;