[XCOFF] make .file directive have directory info

The .file directive is changed to only have basename in D36018 for
ELF.

But on AIX, we require the .file directive to also contain the
directory info. This aligns with other AIX compiler like XLC and is
required by some AIX tool like DBX.

Reviewed By: hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D99785

Author: Chen Zheng

llvm/include/llvm/MC/MCAsmInfo.h

@@ -341,6 +341,10 @@ class MCAsmInfo {
   /// argument and how it is interpreted.  Defaults to NoAlignment.
   LCOMM::LCOMMType LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
 
+  /// True if the target only has basename for .file directive. False if the
+  /// target also needs the directory along with the basename. Default to true.
+  bool HasBasenameOnlyForFileDirective = true;
+
   // True if the target allows .align directives on functions. This is true for
   // most targets, so defaults to true.
   bool HasFunctionAlignment = true;
@@ -666,6 +670,9 @@ class MCAsmInfo {
     return LCOMMDirectiveAlignmentType;
   }
 
+  bool hasBasenameOnlyForFileDirective() const {
+    return HasBasenameOnlyForFileDirective;
+  }
   bool hasFunctionAlignment() const { return HasFunctionAlignment; }
   bool hasDotTypeDotSizeDirective() const { return HasDotTypeDotSizeDirective; }
   bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }

llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -297,8 +297,11 @@ bool AsmPrinter::doInitialization(Module &M) {
   // don't, this at least helps the user find where a global came from.
   if (MAI->hasSingleParameterDotFile()) {
     // .file "foo.c"
-    OutStreamer->emitFileDirective(
-        llvm::sys::path::filename(M.getSourceFileName()));
+    if (MAI->hasBasenameOnlyForFileDirective())
+      OutStreamer->emitFileDirective(
+          llvm::sys::path::filename(M.getSourceFileName()));
+    else
+      OutStreamer->emitFileDirective(M.getSourceFileName());
   }
 
   GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();

llvm/lib/MC/MCAsmInfoXCOFF.cpp

@@ -19,6 +19,7 @@ void MCAsmInfoXCOFF::anchor() {}
 MCAsmInfoXCOFF::MCAsmInfoXCOFF() {
   IsLittleEndian = false;
   HasVisibilityOnlyWithLinkage = true;
+  HasBasenameOnlyForFileDirective = false;
   PrivateGlobalPrefix = "L..";
   PrivateLabelPrefix = "L..";
   SupportsQuotedNames = false;

llvm/test/CodeGen/PowerPC/aix-filename-absolute-path.ll

@@ -0,0 +1,8 @@
+; RUN: llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff < %s \
+; RUN:   | FileCheck %s
+; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff < %s \
+; RUN:   | FileCheck %s
+
+; CHECK: .file "/absolute/path/to/file"
+
+source_filename = "/absolute/path/to/file"

llvm/test/CodeGen/PowerPC/aix-filename-relative-path.ll

@@ -0,0 +1,8 @@
+; RUN: llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff < %s \
+; RUN:   | FileCheck %s
+; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff < %s \
+; RUN:   | FileCheck %s
+
+; CHECK: .file "../relative/path/to/file"
+
+source_filename = "../relative/path/to/file"