[clang] 6725c48 - Allow remapping the sysroot with -fdebug-prefix-map.

[Adrian Prantl via cfe-commits]

Author: Adrian Prantl
Date: 2020-03-20T15:52:39-07:00
New Revision: 6725c4836a5b3c11227869a6f456019a244aa29f

URL: https://github.com/llvm/llvm-project/commit/6725c4836a5b3c11227869a6f456019a244aa29f
DIFF: https://github.com/llvm/llvm-project/commit/6725c4836a5b3c11227869a6f456019a244aa29f.diff

LOG: Allow remapping the sysroot with -fdebug-prefix-map.

<rdar://problem/55685132>

Differential Revision: https://reviews.llvm.org/D76393

Added: 
    

Modified: 
    clang/lib/CodeGen/CGDebugInfo.cpp
    clang/test/CodeGen/debug-prefix-map.c
    llvm/lib/DWARFLinker/DWARFLinker.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index a98d82f7152c..da6cb458982b 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -631,7 +631,7 @@ void CGDebugInfo::CreateCompileUnit() {
           ? llvm::DICompileUnit::DebugNameTableKind::None
           : static_cast<llvm::DICompileUnit::DebugNameTableKind>(
                 CGOpts.DebugNameTable),
-      CGOpts.DebugRangesBaseAddress, Sysroot, SDK);
+      CGOpts.DebugRangesBaseAddress, remapDIPath(Sysroot), SDK);
 }
 
 llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {

diff  --git a/clang/test/CodeGen/debug-prefix-map.c b/clang/test/CodeGen/debug-prefix-map.c
index 5366e19447ae..354110d1b0da 100644
--- a/clang/test/CodeGen/debug-prefix-map.c
+++ b/clang/test/CodeGen/debug-prefix-map.c
@@ -2,6 +2,7 @@
 // RUN: %clang_cc1 -debug-info-kind=standalone -fdebug-prefix-map=%p=/UNLIKELY_PATH=empty %s -emit-llvm -o - | FileCheck %s -check-prefix CHECK-EVIL
 // RUN: %clang_cc1 -debug-info-kind=standalone -fdebug-prefix-map=%p=/UNLIKELY_PATH/empty %s -emit-llvm -o - -main-file-name debug-prefix-map.c | FileCheck %s
 // RUN: %clang_cc1 -debug-info-kind=standalone -fdebug-prefix-map=%p=/UNLIKELY_PATH/empty %s -emit-llvm -o - -fdebug-compilation-dir %p | FileCheck %s -check-prefix CHECK-COMPILATION-DIR
+// RUN: %clang_cc1 -debug-info-kind=standalone -fdebug-prefix-map=%p=/UNLIKELY_PATH/empty %s -emit-llvm -o - -isysroot %p -debugger-tuning=lldb | FileCheck %s -check-prefix CHECK-SYSROOT
 // RUN: %clang -g -fdebug-prefix-map=%p=/UNLIKELY_PATH/empty -S -c %s -emit-llvm -o - | FileCheck %s
 // RUN: %clang -g -ffile-prefix-map=%p=/UNLIKELY_PATH/empty -S -c %s -emit-llvm -o - | FileCheck %s
 
@@ -40,3 +41,4 @@ void test_rewrite_includes() {
 // CHECK-COMPILATION-DIR: !DIFile(filename: "{{.*}}", directory: "/UNLIKELY_PATH/empty")
 // CHECK-COMPILATION-DIR: !DIFile(filename: "{{.*}}Inputs/stdio.h", directory: "/UNLIKELY_PATH/empty")
 // CHECK-COMPILATION-DIR-NOT: !DIFile(filename:
+// CHECK-SYSROOT: !DICompileUnit({{.*}}sysroot: "/UNLIKELY_PATH/empty"

diff  --git a/llvm/lib/DWARFLinker/DWARFLinker.cpp b/llvm/lib/DWARFLinker/DWARFLinker.cpp
index 8464c04f801e..fbc3a3e60cc9 100644
--- a/llvm/lib/DWARFLinker/DWARFLinker.cpp
+++ b/llvm/lib/DWARFLinker/DWARFLinker.cpp
@@ -1914,6 +1914,15 @@ static uint64_t getDwoId(const DWARFDie &CUDie, const DWARFUnit &Unit) {
   return 0;
 }
 
+static std::string remapPath(std::string Path,
+                             const objectPrefixMap &ObjectPrefixMap) {
+  StringRef PathRef(Path);
+  for (const auto &Entry : ObjectPrefixMap)
+    if (PathRef.startswith(Entry.first))
+      return (Twine(Entry.second) + PathRef.substr(Entry.first.size())).str();
+  return Path;
+}
+
 bool DWARFLinker::registerModuleReference(
     DWARFDie CUDie, const DWARFUnit &Unit, const DwarfFile &File,
     OffsetsStringPool &StringPool, UniquingStringPool &UniquingStringPool,