Fix line-continuation bug.

Test/baseResults/lineContinuation.vert.out

@@ -11,6 +11,16 @@ ERROR: node is still EOpNull!
 0:20        'gl_Position' (gl_Position highp 4-component vector of float)
 0:20        Construct vec4 (highp 4-component vector of float)
 0:20          'foo' (highp float)
+0:22  Function Definition: foo2(vf4; (highp 4-component vector of float)
+0:22    Function Parameters: 
+0:22      'a' (in highp 4-component vector of float)
+0:24    Sequence
+0:24      Sequence
+0:24        move second child to first child (highp 4-component vector of float)
+0:24          'b' (highp 4-component vector of float)
+0:24          'a' (in highp 4-component vector of float)
+0:25      Branch: Return with expression
+0:25        'b' (highp 4-component vector of float)
 0:?   Linker Objects
 0:?     'foo' (highp float)
 0:?     'gl_VertexID' (gl_VertexId highp int)

Test/baseResults/lineContinuation100.vert.out

@@ -6,7 +6,8 @@ ERROR: 0:13: 'line continuation' : not supported for this version or the enabled
 ERROR: 0:14: 'line continuation' : not supported for this version or the enabled extensions 
 ERROR: 0:15: 'line continuation' : not supported for this version or the enabled extensions 
 ERROR: 0:18: '#error' : e3  
-ERROR: 8 compilation errors.  No code generated.
+ERROR: 0:24: 'line continuation' : not supported for this version or the enabled extensions 
+ERROR: 9 compilation errors.  No code generated.
 
 ERROR: node is still EOpNull!
 0:20  Function Definition: main( (void)
@@ -16,6 +17,16 @@ ERROR: node is still EOpNull!
 0:20        'gl_Position' (gl_Position highp 4-component vector of float)
 0:20        Construct vec4 (highp 4-component vector of float)
 0:20          'foo' (highp float)
+0:22  Function Definition: foo2(vf4; (highp 4-component vector of float)
+0:22    Function Parameters: 
+0:22      'a' (in highp 4-component vector of float)
+0:24    Sequence
+0:24      Sequence
+0:24        move second child to first child (highp 4-component vector of float)
+0:24          'b' (highp 4-component vector of float)
+0:24          'a' (in highp 4-component vector of float)
+0:25      Branch: Return with expression
+0:25        'b' (highp 4-component vector of float)
 0:?   Linker Objects
 0:?     'foo' (highp float)
 

Test/lineContinuation.vert

@@ -11,10 +11,16 @@ oo;  // same as 'float foo;'
 #error e2
 
 #define MAIN void main() \
-{                        \
+   {                     \
 gl_Position = vec4(foo); \
 } 
 
 #error e3
 
 MAIN
+
+vec4 foo2(vec4 a)
+{                                
+  vec4 b = a;       \
+  return b;                   
+}

Test/lineContinuation100.vert

@@ -11,10 +11,16 @@ oo;  // same as 'float foo;'
 #error e2
 
 #define MAIN void main() \
-{                        \
+   {                     \
 gl_Position = vec4(foo); \
 } 
 
 #error e3
 
 MAIN
+
+vec4 foo2(vec4 a)
+{                                
+  vec4 b = a;       \
+  return b;                   
+}

glslang/MachineIndependent/Scan.cpp

@@ -90,7 +90,7 @@ bool TInputScanner::consumeComment()
                 break;
             } else {
                 // it's a '\', so we need to keep going, after skipping what's escaped
-                    
+
                 // read the skipped character
                 c = get();
 

glslang/MachineIndependent/preprocessor/PpScanner.cpp

@@ -256,10 +256,9 @@ int TPpContext::sourceScan(TPpContext* pp, InputSrc*, TPpToken* ppToken)
     int len, ch, ii;
     unsigned ival = 0;
 
+    ppToken->ival = 0;
+    ch = pp->currentInput->getch(pp, pp->currentInput, ppToken);
     for (;;) {
-        ppToken->ival = 0;
-        ch = pp->currentInput->getch(pp, pp->currentInput, ppToken);
-
         while (ch == ' ' || ch == '\t' || ch == '\r') {
             ppToken->ival = 1;
             ch = pp->currentInput->getch(pp, pp->currentInput, ppToken);
@@ -281,7 +280,7 @@ int TPpContext::sourceScan(TPpContext* pp, InputSrc*, TPpToken* ppToken)
         case 'k': case 'l': case 'm': case 'n': case 'o':
         case 'p': case 'q': case 'r': case 's': case 't':
         case 'u': case 'v': case 'w': case 'x': case 'y':
-        case 'z':            
+        case 'z': case '\\' :
             do {
                 if (ch == '\\') {
                     // escaped character
@@ -311,6 +310,10 @@ int TPpContext::sourceScan(TPpContext* pp, InputSrc*, TPpToken* ppToken)
                 ch == '_' ||
                 ch == '\\');
 
+            // line continuation with no token before or after makes len == 0, and need to start over skipping white space, etc.
+            if (len == 0)
+                continue;
+
             tokenText[len] = '\0';
             pp->currentInput->ungetch(pp, pp->currentInput, ch, ppToken);
             ppToken->atom = pp->LookUpAddString(tokenText);
@@ -706,6 +709,9 @@ int TPpContext::sourceScan(TPpContext* pp, InputSrc*, TPpToken* ppToken)
                 return CPP_ERROR_SY;
             }
         }
+
+        ppToken->ival = 0;
+        ch = pp->currentInput->getch(pp, pp->currentInput, ppToken);
     }
 }