[PATCH] D18699: [ELF] - Teach linkerscript error handler to show full script line + column marker on error.

[George Rimar via llvm-commits]

grimar updated this revision to Diff 52407.
grimar added a comment.

- Addressed review comment.


http://reviews.llvm.org/D18699

Files:
  ELF/LinkerScript.cpp
  test/ELF/linkerscript-diagnostic.s

Index: test/ELF/linkerscript-diagnostic.s
===================================================================
--- test/ELF/linkerscript-diagnostic.s
+++ test/ELF/linkerscript-diagnostic.s
@@ -42,3 +42,25 @@
 # RUN: echo ".temp + { *(.temp) } }" >> %t.script
 # RUN: not ld.lld -shared %t -o %t1 --script %t.script 2>&1 | FileCheck -check-prefix=ERR5 %s
 # ERR5: line 6:
+
+## Check that text of lines and pointer to 'bad' token are working ok.
+# RUN: echo "UNKNOWN_TAG {" > %t.script
+# RUN: echo ".text : { *(.text) }" >> %t.script
+# RUN: echo ".keep : { *(.keep) }" >> %t.script
+# RUN: echo ".temp : { *(.temp) } }" >> %t.script
+# RUN: not ld.lld -shared %t -o %t1 --script %t.script > %t.log 2>&1
+# FileCheck -check-prefix=ERR6 %s < %t.log
+# ERR6: line 1:
+# ERR6: UNKNOWN_TAG {
+# ERR6: {{[ ]{5}\^}}
+
+## One more check that text of lines and pointer to 'bad' token are working ok.
+# RUN: echo "SECTIONS {" > %t.script
+# RUN: echo ".text : { *(.text) }" >> %t.script
+# RUN: echo ".keep : { *(.keep) }" >> %t.script
+# RUN: echo "boom .temp : { *(.temp) } }" >> %t.script
+# RUN: not ld.lld -shared %t -o %t1 --script %t.script > %t.log 2>&1
+# FileCheck -check-prefix=ERR7 %s < %t.log
+# ERR7: line 4:
+# ERR7: boom .temp : { *(.temp) }
+# ERR7: {{[ ]{7}\^}}
Index: ELF/LinkerScript.cpp
===================================================================
--- ELF/LinkerScript.cpp
+++ ELF/LinkerScript.cpp
@@ -138,6 +138,7 @@
   void readSectionPatterns(StringRef OutSec, bool Keep);
 
   size_t getPos();
+  std::pair<StringRef, size_t> getLineColumn();
   std::vector<uint8_t> parseHex(StringRef S);
 
   StringSaver Saver;
@@ -172,11 +173,31 @@
   }
 }
 
+std::pair<StringRef, size_t> ScriptParser::getLineColumn() {
+  size_t Tok = Pos == 0 ? 0 : Pos - 1;
+  StringRef Tail(Tokens[Tok].data());
+  size_t Eol = Tail.find('\n');
+  size_t Len = (Eol != StringRef::npos) ? Eol : Tail.size();
+
+  const char *S = Tail.data();
+  size_t Front = 0;
+  while ((S - Front) > Input.data() && *(S - Front - 1) != '\n')
+    ++Front;
+
+  size_t Col = Front + Tokens[Tok].size() / 2;
+  return {StringRef(S - Front, Len + Front), Col};
+}
+
 // We don't want to record cascading errors. Keep only the first one.
 void ScriptParser::setError(const Twine &Msg) {
   if (Error)
     return;
   error("line " + Twine(getPos()) + ": " + Msg);
+  StringRef Line;
+  size_t Col;
+  std::tie(Line, Col) = getLineColumn();
+  error(Line);
+  error(std::string(Col, ' ') + "^");
   Error = true;
 }
 


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