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Preprocessor related issue fix (#2378)

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* Preprocessor related fix

1). Accoding to ESSL spec : All macro names containing two consecutive underscores ( __ ) are reserved for future use as predefined macro names, so just report a warning instead of error when the shader defines the macro names begining with  '__';

2. According to spec:  If an implementation does not recognize the tokens following #pragma, then it will ignore that pragma, so report a compile-time warning intead of error for the following statement:
#pragma debug(1.23)

3. The 'defined' macro should be allowed to expand and '__LINE__' should be allowed to be replaced with its original line number (otherwise, other expanding macros may change this value).

4. Add a flag 'indentifierSeen' in PPContext to indicate whether the any non-preprocessor tokens is existed before the extension directives, because the built-in symbols and functions are parsed before paring the user shader, so add a 'shaderSource' flag to check this error only for the user shader source;

5. Add missing type int16 and uint16.

* Add test results, remove restriction of #extension.

1. Remove extension restriction in first line , as this is contraversy now.

2. The following shader is compiled failed as glslang consider the keyword 'defined' can not be undefined(in the 9th line: "#define defined BBB")
The shader is as following:
According to ES3.0 spec: It is an error to undefine or to redefine a built-in (pre-defined) macro name.
This rule is aimed to the  __LINE__,  __FILE__, __VERSION__ and  GL_ES,
the keyword "defined" should not be restricted by this rule,
so change the compile error to warning and make the following shader compile successfully.

* 1. Using relaxedError to control error/warning report level. 2. remove #extension restriction. 3. Fix version related issue.

1. Using relaxedError to control error/warning report level. 2. remove #extension restriction. 3. Fix version related issue.

* Add test results

* Turn conditional warnings about pragma to unconditional ones.
This commit is contained in:
Chow 2020-09-15 11:46:24 +08:00 • committed by GitHub
parent ac2f01f4bd
commit 9eaa69c21c
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 29 additions and 7 deletions
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13
glslang/MachineIndependent/preprocessor/Pp.cpp
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@ -422,10 +422,10 @@ int TPpContext::eval(int token, int precedence, bool shortCircuit, int& res, boo
if (! parseContext.isReadingHLSL() && isMacroInput()) {
if (parseContext.relaxedErrors())
parseContext.ppWarn(ppToken->loc, "nonportable when expanded from macros for preprocessor expression",
"defined", "");
"defined", "");
else
parseContext.ppError(ppToken->loc, "cannot use in preprocessor expression when expanded from macros",
"defined", "");
"defined", "");
}
bool needclose = 0;
token = scanToken(ppToken);
@ -1184,7 +1184,9 @@ MacroExpandResult TPpContext::MacroExpand(TPpToken* ppToken, bool expandUndef, b
int macroAtom = atomStrings.getAtom(ppToken->name);
switch (macroAtom) {
case PpAtomLineMacro:
ppToken->ival = parseContext.getCurrentLoc().line;
// Arguments which are macro have been replaced in the first stage.
if (ppToken->ival == 0)
ppToken->ival = parseContext.getCurrentLoc().line;
snprintf(ppToken->name, sizeof(ppToken->name), "%d", ppToken->ival);
UngetToken(PpAtomConstInt, ppToken);
return MacroExpandStarted;
@ -1285,6 +1287,11 @@ MacroExpandResult TPpContext::MacroExpand(TPpToken* ppToken, bool expandUndef, b
nestStack.push_back('}');
else if (nestStack.size() > 0 && token == nestStack.back())
nestStack.pop_back();
//Macro replacement list is expanded in the last stage.
if (atomStrings.getAtom(ppToken->name) == PpAtomLineMacro)
ppToken->ival = parseContext.getCurrentLoc().line;
in->args[arg]->putToken(token, ppToken);
tokenRecorded = true;
}