Preprocessor: Prevent (and give an error on) expression division by 0.

Test/baseResults/cppComplexExpr.vert.out

@@ -42,8 +42,12 @@ ERROR: 0:3006: '#undef' : predefined names can't be (un)defined: __LINE__
 ERROR: 0:3007: '#undef' : predefined names can't be (un)defined: __FILE__
 ERROR: 0:3008: '#undef' : predefined names can't be (un)defined: __VERSION__
 ERROR: 0:3009: '#undef' : names beginning with "GL_" can't be (un)defined: GL_SOME_EXTENSION
+ERROR: 0:4000: 'preprocessor evaluation' : division by 0 
+ERROR: 0:0: 'preprocessor evaluation' : division by 0 
+ERROR: 0:3: 'preprocessor evaluation' : bad expression 
+ERROR: 0:3: 'preprocessor evaluation' : division by 0 
 ERROR: 0:10001: '' : missing #endif 
-ERROR: 44 compilation errors.  No code generated.
+ERROR: 48 compilation errors.  No code generated.
 
 
 Shader version: 300

Test/cppComplexExpr.vert

@@ -171,6 +171,13 @@ float c = foobar(1.1, 2.2
 #undef __VERSION__
 #undef GL_SOME_EXTENSION
 
+#line 4000
+#line 200 % 0     // ERROR, div by 0
+#if __LINE__ / 0  // ERROR, div by 0
+#endif
+
+#if 7%            // ERROR incomplete expression
+
 #line 10000
 #if 0
 // ERROR, EOF
\ No newline at end of file

glslang/MachineIndependent/preprocessor/Pp.cpp

@@ -505,6 +505,13 @@ int TPpContext::eval(int token, int precedence, bool shortCircuit, int& res, boo
 
         token = scanToken(ppToken);
         token = eval(token, binop[op].precedence, shortCircuit, res, err, ppToken);
+
+        if (binop[op].op == op_div || binop[op].op == op_mod) {
+            if (res == 0) {
+                parseContext.ppError(loc, "division by 0", "preprocessor evaluation", "");
+                res = 1;
+            }
+        }
         res = binop[op].op(leftSide, res);
     }