[ELF] Print file:line for unknown PHDR error

Differential revision: https://reviews.llvm.org/D27335

llvm-svn: 288678

Author: eleviant

lld/ELF/LinkerScript.cpp

@@ -972,21 +972,21 @@ std::vector<size_t> LinkerScript<ELFT>::getPhdrIndices(StringRef SectionName) {
 
     std::vector<size_t> Ret;
     for (StringRef PhdrName : Cmd->Phdrs)
-      Ret.push_back(getPhdrIndex(PhdrName));
+      Ret.push_back(getPhdrIndex(Cmd->Location, PhdrName));
     return Ret;
   }
   return {};
 }
 
 template <class ELFT>
-size_t LinkerScript<ELFT>::getPhdrIndex(StringRef PhdrName) {
+size_t LinkerScript<ELFT>::getPhdrIndex(const Twine &Loc, StringRef PhdrName) {
   size_t I = 0;
   for (PhdrsCommand &Cmd : Opt.PhdrsCommands) {
     if (Cmd.Name == PhdrName)
       return I;
     ++I;
   }
-  error("section header '" + PhdrName + "' is not listed in PHDRS");
+  error(Loc + ": section header '" + PhdrName + "' is not listed in PHDRS");
   return 0;
 }
 
@@ -1441,6 +1441,7 @@ uint32_t ScriptParser::readFill() {
 OutputSectionCommand *
 ScriptParser::readOutputSectionDescription(StringRef OutSec) {
   OutputSectionCommand *Cmd = new OutputSectionCommand(OutSec);
+  Cmd->Location = getCurrentLocation();
 
   // Read an address expression.
   // https://sourceware.org/binutils/docs/ld/Output-Section-Address.html#Output-Section-Address

lld/ELF/LinkerScript.h

@@ -124,6 +124,7 @@ struct OutputSectionCommand : BaseCommand {
   std::vector<StringRef> Phdrs;
   uint32_t Filler = 0;
   ConstraintKind Constraint = ConstraintKind::NoConstraint;
+  std::string Location;
 };
 
 // This struct represents one section match pattern in SECTIONS() command.
@@ -268,7 +269,7 @@ template <class ELFT> class LinkerScript final : public LinkerScriptBase {
   ScriptConfiguration &Opt = *ScriptConfig;
 
   std::vector<size_t> getPhdrIndices(StringRef SectionName);
-  size_t getPhdrIndex(StringRef PhdrName);
+  size_t getPhdrIndex(const Twine &Loc, StringRef PhdrName);
 
   uintX_t Dot;
   uintX_t LMAOffset = 0;

lld/test/ELF/linkerscript/phdrs.s

@@ -39,6 +39,14 @@
 # RUN: ld.lld -o %t1 --script %t.script %t
 # RUN: llvm-readobj -program-headers %t1 | FileCheck --check-prefix=DEFHDR %s
 
+## Check that error is reported when trying to use phdr which is not listed 
+## inside PHDRS {} block
+## TODO: If script doesn't contain PHDRS {} block then default phdr is always 
+## created and error is not reported.
+# RUN: echo "PHDRS { all PT_LOAD; } \
+# RUN:       SECTIONS { .baz : {*(.foo.*)} :bar }" > %t.script
+# RUN: not ld.lld -o %t1 --script %t.script %t 2>&1 | FileCheck --check-prefix=BADHDR %s
+
 # CHECK:     ProgramHeaders [
 # CHECK-NEXT:  ProgramHeader {
 # CHECK-NEXT:    Type: PT_LOAD (0x1)
@@ -120,6 +128,8 @@
 # DEFHDR-NEXT:      PF_X (0x1)
 # DEFHDR-NEXT:    ]
 
+# BADHDR:       {{.*}}.script:1: section header 'bar' is not listed in PHDRS
+
 .global _start
 _start:
  nop