[llvm-readobj] - Report unique warnings in printProgramHeaders.

[grimar]

Summary

This converts reportWarning -> reportUniqueWarning

llvm/test/tools/llvm-readobj/ELF/program-headers.test

 
 ## Check that llvm-readelf reports a warning when a program interpreter
 ## name is non-null-terminated or when PT_INTERP has an offset that
 ## goes past the end of the file.
 # RUN: yaml2obj --docnum=2 %s -o %t.err
 
 ## Show the size of the output produced. It is used in the YAML below.
 # RUN: wc -c < %t.err | FileCheck %s --check-prefix=SIZE
-# SIZE: 560
+# SIZE: 616
 
 ## Write the additional 'C', '\0, 'C' bytes to the end.
 # RUN: echo -n -e "C\x00C" >> %t.err
 
 # RUN: llvm-readelf --program-headers %t.err 2>&1 | \
-# RUN:   FileCheck %s -DFILE=%t.err --check-prefix=ERROR-INTERP
+# RUN:   FileCheck %s -DFILE=%t.err --check-prefix=ERROR-INTERP --implicit-check-not=warning:
 
 # ERROR-INTERP:      Type           Offset
-# ERROR-INTERP-NEXT: INTERP         0x000[[#%x,OFFSET:0x230]]
+# ERROR-INTERP-NEXT: INTERP         0x000[[#%x,OFFSET:0x268]]
 # ERROR-INTERP-NEXT:     [Requesting program interpreter: C]
 # ERROR-INTERP-NEXT: INTERP         0x000[[#OFFSET + 1]]
 # ERROR-INTERP-NEXT:     [Requesting program interpreter: ]
 # ERROR-INTERP-NEXT: INTERP         0x000[[#OFFSET + 2]]
 # ERROR-INTERP-NEXT: warning: '[[FILE]]': unable to read program interpreter name at offset 0x[[#OFFSET+2]]: it is not null-terminated
 # ERROR-INTERP-NEXT: INTERP         0x000[[#OFFSET + 3]]
 # ERROR-INTERP-NEXT: warning: '[[FILE]]': unable to read program interpreter name at offset 0x[[#OFFSET+3]]: it goes past the end of the file (0x[[#OFFSET + 3]])
 # ERROR-INTERP-NEXT: INTERP         0xaabbccddeeff1122
 # ERROR-INTERP-NEXT: warning: '[[FILE]]': unable to read program interpreter name at offset 0xaabbccddeeff1122: it goes past the end of the file (0x[[#OFFSET + 3]])
+# ERROR-INTERP-NEXT: INTERP         0xaabbccddeeff1122
 
 --- !ELF
 FileHeader:
   Class: ELFCLASS64
   Data:  ELFDATA2LSB
   Type:  ET_EXEC
 ProgramHeaders:
 ## Case 1: the offset points to the first additional byte.
   - Type:   PT_INTERP
-    Offset: 560
+    Offset: 616
 ## Case 1: the offset points to the second additional byte,
 ##         which is a null byte.
   - Type:   PT_INTERP
-    Offset: 561
+    Offset: 617
 ## Case 3: the offset points to the third additional
 ##         byte, which is the last byte in the file.
   - Type:   PT_INTERP
-    Offset: 562
+    Offset: 618
 ## Case 4: the offset goes 1 byte past the end of the file.
   - Type:   PT_INTERP
-    Offset: 563
+    Offset: 619
 ## Case 5: an arbitrary large offset that goes past the end of the file.
   - Type:   PT_INTERP
     Offset: 0xAABBCCDDEEFF1122
+## Case 6: the same as case 5. Used to demonstrate that we don't report
+##         the same warning twice.
+  - Type:   PT_INTERP
+    Offset: 0xAABBCCDDEEFF1122
 
 ## Check we report a warning when we are unable to read program headers.
 ## Case A: the e_phentsize field is invalid.
 # RUN: yaml2obj --docnum=3 -DPHENTSIZE=1 %s -o %t.phdr.err
 # RUN: llvm-readelf --program-headers %t.phdr.err 2>&1 | \
 # RUN:   FileCheck %s -DFILE=%t.phdr.err --check-prefix=WARN-PHENTSIZE-GNU
 # RUN: llvm-readobj --program-headers %t.phdr.err 2>&1 | \
 # RUN:   FileCheck %s -DFILE=%t.phdr.err --check-prefix=WARN-PHENTSIZE-LLVM

llvm/tools/llvm-readobj/ELFDumper.cpp

for (const Elf_Phdr &Phdr : *PhdrsOrErr) {
     Fields[5].Str = to_string(format_hex(Phdr.p_memsz, SizeWidth));
     Fields[6].Str = printPhdrFlags(Phdr.p_flags);
     Fields[7].Str = to_string(format_hex(Phdr.p_align, 1));
     for (const Field &F : Fields)
       printField(F);
     if (Phdr.p_type == ELF::PT_INTERP) {
       OS << "\n";
       auto ReportBadInterp = [&](const Twine &Msg) {
-        reportWarning(
-            createError("unable to read program interpreter name at offset 0x" +
-                        Twine::utohexstr(Phdr.p_offset) + ": " + Msg),
-            this->FileName);
+        this->reportUniqueWarning(
+            "unable to read program interpreter name at offset 0x" +
+            Twine::utohexstr(Phdr.p_offset) + ": " + Msg);
       };
 
       if (Phdr.p_offset >= this->Obj.getBufSize()) {
         ReportBadInterp("it goes past the end of the file (0x" +
                         Twine::utohexstr(this->Obj.getBufSize()) + ")");
         continue;
       }