Preventing double imports. Closes #102

src/main/java/dk/camelot64/kickc/Compiler.java

@@ -19,10 +19,9 @@ public class Compiler {
    private Program program;
 
    public Compiler() {
-      this.program = new Program(new ProgramScope(), new CompileLog());
-      this.program.setImportPaths(new ArrayList<>());
+      this.program = new Program();
    }
-   
+
    public CompileLog getLog() {
       return program.getLog();
    }
@@ -57,45 +56,51 @@ public class Compiler {
    }
 
    public static void loadAndParseFile(String fileName, Program program, StatementSequenceGenerator statementSequenceGenerator) {
-      CharStream fileStream = loadFile(fileName, program);
-      program.getLog().append(fileStream.toString());
-      KickCLexer lexer = new KickCLexer(fileStream);
-      KickCParser parser = new KickCParser(new CommonTokenStream(lexer));
-      parser.setBuildParseTree(true);
-      parser.addErrorListener(new BaseErrorListener() {
-         @Override
-         public void syntaxError(
-               Recognizer<?, ?> recognizer,
-               Object offendingSymbol,
-               int line,
-               int charPositionInLine,
-               String msg,
-               RecognitionException e) {
-            throw new CompileError("Error parsing  file " + fileStream.getSourceName() + "\n - Line: " + line + "\n - Message: " + msg);
-         }
-      });
-      statementSequenceGenerator.generate(parser.file());
-   }
-
-   private static CharStream loadFile(String fileName, Program program) {
-      if(!fileName.endsWith(".kc")) {
-         fileName += ".kc";
-      }
       try {
-         List<String> importPaths = program.getImportPaths();
-         for (String importPath : importPaths) {
-            if(!importPath.endsWith("/")) {
-               importPath += "/";
-            }
-            String filePath = importPath + fileName;
-            File file = new File(filePath);
-            if(file.exists()) {
-               return CharStreams.fromPath(file.toPath());
-            }
+         File file = loadFile(fileName, program);
+         List<String> imported = program.getImported();
+         if (imported.contains(file.getAbsolutePath())) {
+            return;
          }
+         final CharStream fileStream = CharStreams.fromPath(file.toPath());
+         imported.add(file.getAbsolutePath());
+         program.getLog().append(fileStream.toString());
+         KickCLexer lexer = new KickCLexer(fileStream);
+         KickCParser parser = new KickCParser(new CommonTokenStream(lexer));
+         parser.setBuildParseTree(true);
+         parser.addErrorListener(new BaseErrorListener() {
+            @Override
+            public void syntaxError(
+                  Recognizer<?, ?> recognizer,
+                  Object offendingSymbol,
+                  int line,
+                  int charPositionInLine,
+                  String msg,
+                  RecognitionException e) {
+               throw new CompileError("Error parsing  file " + fileStream.getSourceName() + "\n - Line: " + line + "\n - Message: " + msg);
+            }
+         });
+         statementSequenceGenerator.generate(parser.file());
       } catch (IOException e) {
          throw new CompileError("Error loading file " + fileName, e);
       }
+   }
+
+   private static File loadFile(String fileName, Program program) {
+      if (!fileName.endsWith(".kc")) {
+         fileName += ".kc";
+      }
+      List<String> importPaths = program.getImportPaths();
+      for (String importPath : importPaths) {
+         if (!importPath.endsWith("/")) {
+            importPath += "/";
+         }
+         String filePath = importPath + fileName;
+         File file = new File(filePath);
+         if (file.exists()) {
+            return file;
+         }
+      }
       throw new CompileError("File  not found " + fileName);
    }
 

src/main/java/dk/camelot64/kickc/model/Program.java

@@ -1,10 +1,9 @@
 package dk.camelot64.kickc.model;
 
-import com.fasterxml.jackson.annotation.JsonCreator;
-import com.fasterxml.jackson.annotation.JsonProperty;
 import dk.camelot64.kickc.CompileLog;
 import dk.camelot64.kickc.asm.AsmProgram;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /** A KickC Intermediate Compiler Language (ICL) Program */
@@ -12,6 +11,8 @@ public class Program {
 
    /** Paths used for importing files. */
    private List<String> importPaths;
+   /** Imported files. */
+   private List<String> imported;
    /** The initial statement sequence generated byt the parser. */
    private StatementSequence statementSequence;
    /** The main scope. */
@@ -52,27 +53,19 @@ public class Program {
    /** Separation of live range equivalence classes into scopes - used for register uplift */
    private RegisterUpliftProgram registerUpliftProgram;
 
-   @JsonCreator
-   public Program(
-         @JsonProperty("scope") ProgramScope scope,
-         @JsonProperty("graph") ControlFlowGraph graph,
-         @JsonProperty("asm") AsmProgram asm) {
-      this.scope = scope;
-      this.graph = graph;
-      this.asm = asm;
-   }
-
-   public Program(ProgramScope programScope, CompileLog log) {
-      this.scope = programScope;
-      this.log = log;
+   public Program() {
+      this.scope = new ProgramScope();
+      this.log = new CompileLog();
+      this.importPaths = new ArrayList<>();
+      this.imported = new ArrayList<>();
    }
 
    public List<String> getImportPaths() {
       return importPaths;
    }
 
-   public void setImportPaths(List<String> importPaths) {
-      this.importPaths = importPaths;
+   public List<String> getImported() {
+      return imported;
    }
 
    public StatementSequence getStatementSequence() {

src/main/java/dk/camelot64/kickc/test/TestPrograms.java

@@ -24,6 +24,10 @@ public class TestPrograms extends TestCase {
       helper = new ReferenceHelper("dk/camelot64/kickc/test/ref/");
    }
 
+   public void testDoubleImport() throws IOException, URISyntaxException {
+      compileAndCompare("double-import");
+   }
+
    public void testImporting() throws IOException, URISyntaxException {
       compileAndCompare("importing");
    }

src/main/java/dk/camelot64/kickc/test/double-import.kc

@@ -0,0 +1,6 @@
+import "imported"
+import "imported"
+
+void main() {
+    *BGCOL = RED;
+}

src/main/java/dk/camelot64/kickc/test/ref/double-import.asm

@@ -0,0 +1,11 @@
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+  .const BGCOL = $d021
+  .const RED = 2
+  jsr main
+main: {
+    lda #RED
+    sta BGCOL
+    rts
+}

src/main/java/dk/camelot64/kickc/test/ref/double-import.cfg

@@ -0,0 +1,15 @@
+@begin: scope:[]  from
+  [0] phi() [ ] ( )
+  to:@1
+@1: scope:[]  from @begin
+  [1] phi() [ ] ( )
+  [2] call main param-assignment [ ] ( )
+  to:@end
+@end: scope:[]  from @1
+  [3] phi() [ ] ( )
+main: scope:[main]  from @1
+  [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] )
+  to:main::@return
+main::@return: scope:[main]  from main
+  [5] return  [ ] ( main:2 [ ] )
+  to:@return

src/main/java/dk/camelot64/kickc/test/ref/double-import.log

@@ -0,0 +1,514 @@
+import "imported"
+import "imported"
+
+void main() {
+    *BGCOL = RED;
+}
+Importing imported
+const byte *BGCOL = $d021;
+const byte RED = 2;
+
+Importing imported
+PROGRAM
+  (byte*) BGCOL ← (word) 53281
+  (byte) RED ← (byte/signed byte/word/signed word) 2
+proc (void()) main()
+  *((byte*) BGCOL) ← (byte) RED
+main::@return:
+  return 
+endproc // main()
+  call main 
+
+SYMBOLS
+(byte*) BGCOL
+(byte) RED
+(void()) main()
+(label) main::@return
+
+Promoting word to byte* in BGCOL ← ((byte*)) 53281
+INITIAL CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  (byte*) BGCOL ← ((byte*)) (word) 53281
+  (byte) RED ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from
+  *((byte*) BGCOL) ← (byte) RED
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  call main 
+  to:@end
+@end: scope:[]  from @1
+
+CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  (byte*) BGCOL ← ((byte*)) (word) 53281
+  (byte) RED ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from
+  *((byte*) BGCOL) ← (byte) RED
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  call main 
+  to:@end
+@end: scope:[]  from @1
+
+PROCEDURE MODIFY VARIABLE ANALYSIS
+
+CONTROL FLOW GRAPH WITH ASSIGNMENT CALL
+@begin: scope:[]  from
+  (byte*) BGCOL ← ((byte*)) (word) 53281
+  (byte) RED ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from @1
+  *((byte*) BGCOL) ← (byte) RED
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  call main param-assignment
+  to:@2
+@2: scope:[]  from @1
+  to:@end
+@end: scope:[]  from @2
+
+Completing Phi functions...
+Completing Phi functions...
+CONTROL FLOW GRAPH SSA
+@begin: scope:[]  from
+  (byte*) BGCOL#0 ← ((byte*)) (word) 53281
+  (byte) RED#0 ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from @1
+  (byte*) BGCOL#1 ← phi( @1/(byte*) BGCOL#2 )
+  (byte) RED#1 ← phi( @1/(byte) RED#2 )
+  *((byte*) BGCOL#1) ← (byte) RED#1
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  (byte*) BGCOL#2 ← phi( @begin/(byte*) BGCOL#0 )
+  (byte) RED#2 ← phi( @begin/(byte) RED#0 )
+  call main param-assignment
+  to:@2
+@2: scope:[]  from @1
+  to:@end
+@end: scope:[]  from @2
+
+CONTROL FLOW GRAPH WITH ASSIGNMENT CALL & RETURN
+@begin: scope:[]  from
+  (byte*) BGCOL#0 ← ((byte*)) (word) 53281
+  (byte) RED#0 ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from @1
+  (byte*) BGCOL#1 ← phi( @1/(byte*) BGCOL#2 )
+  (byte) RED#1 ← phi( @1/(byte) RED#2 )
+  *((byte*) BGCOL#1) ← (byte) RED#1
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  (byte*) BGCOL#2 ← phi( @begin/(byte*) BGCOL#0 )
+  (byte) RED#2 ← phi( @begin/(byte) RED#0 )
+  call main param-assignment
+  to:@2
+@2: scope:[]  from @1
+  to:@end
+@end: scope:[]  from @2
+
+INITIAL SSA SYMBOL TABLE
+(label) @1
+(label) @2
+(label) @begin
+(label) @end
+(byte*) BGCOL
+(byte*) BGCOL#0
+(byte*) BGCOL#1
+(byte*) BGCOL#2
+(byte) RED
+(byte) RED#0
+(byte) RED#1
+(byte) RED#2
+(void()) main()
+(label) main::@return
+
+Culled Empty Block (label) @2
+Succesful SSA optimization Pass2CullEmptyBlocks
+CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  (byte*) BGCOL#0 ← ((byte*)) (word) 53281
+  (byte) RED#0 ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from @1
+  (byte*) BGCOL#1 ← phi( @1/(byte*) BGCOL#2 )
+  (byte) RED#1 ← phi( @1/(byte) RED#2 )
+  *((byte*) BGCOL#1) ← (byte) RED#1
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  (byte*) BGCOL#2 ← phi( @begin/(byte*) BGCOL#0 )
+  (byte) RED#2 ← phi( @begin/(byte) RED#0 )
+  call main param-assignment
+  to:@end
+@end: scope:[]  from @1
+
+Not aliassing across scopes: RED#1 RED#2
+Not aliassing across scopes: BGCOL#1 BGCOL#2
+Alias (byte) RED#0 = (byte) RED#2 
+Alias (byte*) BGCOL#0 = (byte*) BGCOL#2 
+Succesful SSA optimization Pass2AliasElimination
+CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  (byte*) BGCOL#0 ← ((byte*)) (word) 53281
+  (byte) RED#0 ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from @1
+  (byte*) BGCOL#1 ← phi( @1/(byte*) BGCOL#0 )
+  (byte) RED#1 ← phi( @1/(byte) RED#0 )
+  *((byte*) BGCOL#1) ← (byte) RED#1
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  call main param-assignment
+  to:@end
+@end: scope:[]  from @1
+
+Not aliassing across scopes: RED#1 RED#0
+Not aliassing across scopes: BGCOL#1 BGCOL#0
+Redundant Phi (byte) RED#1 (byte) RED#0
+Redundant Phi (byte*) BGCOL#1 (byte*) BGCOL#0
+Succesful SSA optimization Pass2RedundantPhiElimination
+CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  (byte*) BGCOL#0 ← ((byte*)) (word) 53281
+  (byte) RED#0 ← (byte/signed byte/word/signed word) 2
+  to:@1
+main: scope:[main]  from @1
+  *((byte*) BGCOL#0) ← (byte) RED#0
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  call main param-assignment
+  to:@end
+@end: scope:[]  from @1
+
+Constant (const byte*) BGCOL#0 = ((byte*))53281
+Constant (const byte) RED#0 = 2
+Succesful SSA optimization Pass2ConstantIdentification
+CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  to:@1
+main: scope:[main]  from @1
+  *((const byte*) BGCOL#0) ← (const byte) RED#0
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  call main param-assignment
+  to:@end
+@end: scope:[]  from @1
+
+FINAL SYMBOL TABLE
+(label) @1
+(label) @begin
+(label) @end
+(byte*) BGCOL
+(const byte*) BGCOL#0 = ((byte*))(word) 53281
+(byte) RED
+(const byte) RED#0 = (byte/signed byte/word/signed word) 2
+(void()) main()
+(label) main::@return
+
+Block Sequence Planned @begin @1 @end main main::@return 
+Block Sequence Planned @begin @1 @end main main::@return 
+CONTROL FLOW GRAPH - PHI LIFTED
+@begin: scope:[]  from
+  to:@1
+@1: scope:[]  from @begin
+  call main param-assignment
+  to:@end
+@end: scope:[]  from @1
+main: scope:[main]  from @1
+  *((const byte*) BGCOL#0) ← (const byte) RED#0
+  to:main::@return
+main::@return: scope:[main]  from main
+  return 
+  to:@return
+
+Adding NOP phi() at start of @begin
+Adding NOP phi() at start of @1
+Adding NOP phi() at start of @end
+CALL GRAPH
+Calls in [] to main:2 
+
+Propagating live ranges...
+CONTROL FLOW GRAPH - LIVE RANGES FOUND
+@begin: scope:[]  from
+  [0] phi() [ ]
+  to:@1
+@1: scope:[]  from @begin
+  [1] phi() [ ]
+  [2] call main param-assignment [ ]
+  to:@end
+@end: scope:[]  from @1
+  [3] phi() [ ]
+main: scope:[main]  from @1
+  [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ]
+  to:main::@return
+main::@return: scope:[main]  from main
+  [5] return  [ ]
+  to:@return
+
+Created 0 initial phi equivalence classes
+Coalesced down to 0 phi equivalence classes
+Block Sequence Planned @begin @1 @end main main::@return 
+Adding NOP phi() at start of @begin
+Adding NOP phi() at start of @1
+Adding NOP phi() at start of @end
+Propagating live ranges...
+CONTROL FLOW GRAPH - BEFORE EFFECTIVE LIVE RANGES
+@begin: scope:[]  from
+  [0] phi() [ ]
+  to:@1
+@1: scope:[]  from @begin
+  [1] phi() [ ]
+  [2] call main param-assignment [ ]
+  to:@end
+@end: scope:[]  from @1
+  [3] phi() [ ]
+main: scope:[main]  from @1
+  [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ]
+  to:main::@return
+main::@return: scope:[main]  from main
+  [5] return  [ ]
+  to:@return
+
+CONTROL FLOW GRAPH - PHI MEM COALESCED
+@begin: scope:[]  from
+  [0] phi() [ ] ( )
+  to:@1
+@1: scope:[]  from @begin
+  [1] phi() [ ] ( )
+  [2] call main param-assignment [ ] ( )
+  to:@end
+@end: scope:[]  from @1
+  [3] phi() [ ] ( )
+main: scope:[main]  from @1
+  [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] )
+  to:main::@return
+main::@return: scope:[main]  from main
+  [5] return  [ ] ( main:2 [ ] )
+  to:@return
+
+DOMINATORS
+@begin dominated by  @begin 
+@1 dominated by  @1 @begin 
+@end dominated by  @1 @begin @end 
+main dominated by  @1 @begin main 
+main::@return dominated by  main::@return @1 @begin main 
+
+NATURAL LOOPS
+
+Found 0 loops in scope []
+Found 0 loops in scope [main]
+NATURAL LOOPS WITH DEPTH
+
+
+VARIABLE REGISTER WEIGHTS
+(byte*) BGCOL
+(byte) RED
+(void()) main()
+
+Initial phi equivalence classes
+Complete equivalence classes
+INITIAL ASM
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .const BGCOL = $d021
+  .const RED = 2
+//SEG2 @begin
+bbegin:
+//SEG3 [1] phi from @begin to @1 [phi:@begin->@1]
+b1_from_bbegin:
+  jmp b1
+//SEG4 @1
+b1:
+//SEG5 [2] call main param-assignment [ ] ( )
+  jsr main
+//SEG6 [3] phi from @1 to @end [phi:@1->@end]
+bend_from_b1:
+  jmp bend
+//SEG7 @end
+bend:
+//SEG8 main
+main: {
+  //SEG9 [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] ) -- _deref_cowo1=coby2 
+    lda #RED
+    sta BGCOL
+    jmp breturn
+  //SEG10 main::@return
+  breturn:
+  //SEG11 [5] return  [ ] ( main:2 [ ] )
+    rts
+}
+
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] ) always clobbers reg byte a 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [main] 
+Uplift Scope [] 
+
+Uplifting [main] best 27 combination 
+Uplifting [] best 27 combination 
+Removing instruction jmp b1
+Removing instruction jmp bend
+Removing instruction jmp breturn
+Succesful ASM optimization Pass5NextJumpElimination
+ASSEMBLER
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .const BGCOL = $d021
+  .const RED = 2
+//SEG2 @begin
+bbegin:
+//SEG3 [1] phi from @begin to @1 [phi:@begin->@1]
+b1_from_bbegin:
+//SEG4 @1
+b1:
+//SEG5 [2] call main param-assignment [ ] ( )
+  jsr main
+//SEG6 [3] phi from @1 to @end [phi:@1->@end]
+bend_from_b1:
+//SEG7 @end
+bend:
+//SEG8 main
+main: {
+  //SEG9 [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] ) -- _deref_cowo1=coby2 
+    lda #RED
+    sta BGCOL
+  //SEG10 main::@return
+  breturn:
+  //SEG11 [5] return  [ ] ( main:2 [ ] )
+    rts
+}
+
+Removing instruction bbegin:
+Removing instruction b1_from_bbegin:
+Removing instruction bend_from_b1:
+Succesful ASM optimization Pass5RedundantLabelElimination
+ASSEMBLER
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .const BGCOL = $d021
+  .const RED = 2
+//SEG2 @begin
+//SEG3 [1] phi from @begin to @1 [phi:@begin->@1]
+//SEG4 @1
+b1:
+//SEG5 [2] call main param-assignment [ ] ( )
+  jsr main
+//SEG6 [3] phi from @1 to @end [phi:@1->@end]
+//SEG7 @end
+bend:
+//SEG8 main
+main: {
+  //SEG9 [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] ) -- _deref_cowo1=coby2 
+    lda #RED
+    sta BGCOL
+  //SEG10 main::@return
+  breturn:
+  //SEG11 [5] return  [ ] ( main:2 [ ] )
+    rts
+}
+
+Removing instruction b1:
+Removing instruction bend:
+Removing instruction breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+ASSEMBLER
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .const BGCOL = $d021
+  .const RED = 2
+//SEG2 @begin
+//SEG3 [1] phi from @begin to @1 [phi:@begin->@1]
+//SEG4 @1
+//SEG5 [2] call main param-assignment [ ] ( )
+  jsr main
+//SEG6 [3] phi from @1 to @end [phi:@1->@end]
+//SEG7 @end
+//SEG8 main
+main: {
+  //SEG9 [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] ) -- _deref_cowo1=coby2 
+    lda #RED
+    sta BGCOL
+  //SEG10 main::@return
+  //SEG11 [5] return  [ ] ( main:2 [ ] )
+    rts
+}
+
+FINAL SYMBOL TABLE
+(label) @1
+(label) @begin
+(label) @end
+(byte*) BGCOL
+(const byte*) BGCOL#0 BGCOL = ((byte*))(word) 53281
+(byte) RED
+(const byte) RED#0 RED = (byte/signed byte/word/signed word) 2
+(void()) main()
+(label) main::@return
+
+
+FINAL CODE
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .const BGCOL = $d021
+  .const RED = 2
+//SEG2 @begin
+//SEG3 [1] phi from @begin to @1 [phi:@begin->@1]
+//SEG4 @1
+//SEG5 [2] call main param-assignment [ ] ( )
+  jsr main
+//SEG6 [3] phi from @1 to @end [phi:@1->@end]
+//SEG7 @end
+//SEG8 main
+main: {
+  //SEG9 [4] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ ] ( main:2 [ ] ) -- _deref_cowo1=coby2 
+    lda #RED
+    sta BGCOL
+  //SEG10 main::@return
+  //SEG11 [5] return  [ ] ( main:2 [ ] )
+    rts
+}
+

src/main/java/dk/camelot64/kickc/test/ref/double-import.sym

@@ -0,0 +1,10 @@
+(label) @1
+(label) @begin
+(label) @end
+(byte*) BGCOL
+(const byte*) BGCOL#0 BGCOL = ((byte*))(word) 53281
+(byte) RED
+(const byte) RED#0 RED = (byte/signed byte/word/signed word) 2
+(void()) main()
+(label) main::@return
+