compile: Detect invalid and likely-bad import statements.

* Make-lang.in (go/gogo.o): Depend on filenames.h.

From-SVN: r191372

gcc/go/ChangeLog

@@ -1,3 +1,7 @@
+2012-09-16  Ian Lance Taylor  <iant@google.com>
+
+	* Make-lang.in (go/gogo.o): Depend on filenames.h.
+
 2012-08-14   Diego Novillo  <dnovillo@google.com>
 
 	Merge from cxx-conversion branch.  Configury.

gcc/go/Make-lang.in

@@ -289,10 +289,11 @@ go/gogo-tree.o: go/gofrontend/gogo-tree.cc $(GO_SYSTEM_H) $(TOPLEV_H) \
 	convert.h output.h $(DIAGNOSTIC_H) $(GO_TYPES_H) \
 	$(GO_EXPRESSIONS_H) $(GO_STATEMENTS_H) $(GO_RUNTIME_H) \
 	go/gofrontend/backend.h $(GO_GOGO_H)
-go/gogo.o: go/gofrontend/gogo.cc $(GO_SYSTEM_H) $(GO_C_H) \
-	go/gofrontend/go-dump.h $(GO_LEX_H) $(GO_TYPES_H) $(GO_STATEMENTS_H) \
-	$(GO_EXPRESSIONS_H) go/gofrontend/dataflow.h $(GO_RUNTIME_H) \
-	$(GO_IMPORT_H) $(GO_EXPORT_H) go/gofrontend/backend.h $(GO_GOGO_H)
+go/gogo.o: go/gofrontend/gogo.cc $(GO_SYSTEM_H) \
+	$(srcdir)/../include/filenames.h $(GO_C_H) go/gofrontend/go-dump.h \
+	$(GO_LEX_H) $(GO_TYPES_H) $(GO_STATEMENTS_H) $(GO_EXPRESSIONS_H) \
+	go/gofrontend/dataflow.h $(GO_RUNTIME_H) $(GO_IMPORT_H) \
+	$(GO_EXPORT_H) go/gofrontend/backend.h $(GO_GOGO_H)
 go/import.o: go/gofrontend/import.cc $(GO_SYSTEM_H) \
 	$(srcdir)/../include/filenames.h $(srcdir)/../include/simple-object.h \
 	$(GO_C_H) $(GO_GOGO_H) $(GO_LEX_H) $(GO_TYPES_H) $(GO_EXPORT_H) \

gcc/go/gofrontend/gogo.cc

@@ -6,6 +6,8 @@
 
 #include "go-system.h"
 
+#include "filenames.h"
+
 #include "go-c.h"
 #include "go-dump.h"
 #include "lex.h"
@@ -385,6 +387,57 @@ Gogo::import_package(const std::string& filename,
 		     bool is_local_name_exported,
 		     Location location)
 {
+  if (filename.empty())
+    {
+      error_at(location, "import path is empty");
+      return;
+    }
+
+  const char *pf = filename.data();
+  const char *pend = pf + filename.length();
+  while (pf < pend)
+    {
+      unsigned int c;
+      int adv = Lex::fetch_char(pf, &c);
+      if (adv == 0)
+	{
+	  error_at(location, "import path contains invalid UTF-8 sequence");
+	  return;
+	}
+      if (c == '\0')
+	{
+	  error_at(location, "import path contains NUL");
+	  return;
+	}
+      if (c < 0x20 || c == 0x7f)
+	{
+	  error_at(location, "import path contains control character");
+	  return;
+	}
+      if (c == '\\')
+	{
+	  error_at(location, "import path contains backslash; use slash");
+	  return;
+	}
+      if (Lex::is_unicode_space(c))
+	{
+	  error_at(location, "import path contains space character");
+	  return;
+	}
+      if (c < 0x7f && strchr("!\"#$%&'()*,:;<=>?[]^`{|}", c) != NULL)
+	{
+	  error_at(location, "import path contains invalid character '%c'", c);
+	  return;
+	}
+      pf += adv;
+    }
+
+  if (IS_ABSOLUTE_PATH(filename.c_str()))
+    {
+      error_at(location, "import path cannot be absolute path");
+      return;
+    }
+
   if (filename == "unsafe")
     {
       this->import_unsafe(local_name, is_local_name_exported, location);

gcc/go/gofrontend/lex.cc

@@ -1705,6 +1705,27 @@ struct Unicode_range
   unsigned int stride;
 };
 
+// A table of whitespace characters--Unicode code points classified as
+// "Space", "C" locale whitespace characters, the "next line" control
+// character (0085), the line separator (2028), the paragraph
+// separator (2029), and the "zero-width non-break space" (feff).
+
+static const Unicode_range unicode_space[] =
+{
+  { 0x0009, 0x000d, 1 },
+  { 0x0020, 0x0020, 1 },
+  { 0x0085, 0x0085, 1 },
+  { 0x00a0, 0x00a0, 1 },
+  { 0x1680, 0x1680, 1 },
+  { 0x180e, 0x180e, 1 },
+  { 0x2000, 0x200a, 1 },
+  { 0x2028, 0x2029, 1 },
+  { 0x202f, 0x202f, 1 },
+  { 0x205f, 0x205f, 1 },
+  { 0x3000, 0x3000, 1 },
+  { 0xfeff, 0xfeff, 1 },
+};
+
 // A table of Unicode digits--Unicode code points classified as
 // "Digit".
 
@@ -2294,6 +2315,15 @@ Lex::is_in_unicode_range(unsigned int c, const Unicode_range* ranges,
     }
 }
 
+// Return whether C is a space character.
+
+bool
+Lex::is_unicode_space(unsigned int c)
+{
+  return Lex::is_in_unicode_range(c, unicode_space,
+				  ARRAY_SIZE(unicode_space));
+}
+
 // Return whether C is a Unicode digit--a Unicode code point
 // classified as "Digit".
 

gcc/go/gofrontend/lex.h

@@ -375,6 +375,10 @@ class Lex
   static int
   fetch_char(const char* str, unsigned int *value);
 
+  // Return whether C is a Unicode or "C" locale space character.
+  static bool
+  is_unicode_space(unsigned int c);
+
  private:
   ssize_t
   get_line();

gcc/go/gofrontend/parse.cc

@@ -5337,7 +5337,8 @@ Parse::import_spec(void*)
 
   if (!token->is_string())
     {
-      error_at(this->location(), "missing import package name");
+      error_at(this->location(), "import statement not a string");
+      this->advance_token();
       return;
     }