[llvm] d797c2f - [DebugInfo] -fdebug-prefix-map: handle '#line "file"' for asm source
Fangrui Song via llvm-commits
llvm-commits at lists.llvm.org
Sun Aug 14 20:58:29 PDT 2022
Author: Fangrui Song
Date: 2022-08-14T20:58:23-07:00
New Revision: d797c2ffdb591d10de2964907962aaacb2e360ca
URL: https://github.com/llvm/llvm-project/commit/d797c2ffdb591d10de2964907962aaacb2e360ca
DIFF: https://github.com/llvm/llvm-project/commit/d797c2ffdb591d10de2964907962aaacb2e360ca.diff
LOG: [DebugInfo] -fdebug-prefix-map: handle '#line "file"' for asm source
`getContext().setMCLineTableRootFile` (from D62074) sets `RootFile.Name` to
`FirstCppHashFilename`. `RootFile.Name` is not processed by -fdebug-prefix-map
and will go to DW_TAG_compile_unit's DT_AT_name and DW_TAG_label's
DW_AT_decl_file. Remap `RootFile.Name`.
Fix another issue reported by https://github.com/llvm/llvm-project/issues/56609
Reviewed By: #debug-info, dblaikie, raj.khem
Differential Revision: https://reviews.llvm.org/D131848
Added:
Modified:
llvm/include/llvm/MC/MCDwarf.h
llvm/lib/MC/MCContext.cpp
llvm/test/MC/ELF/debug-hash-file.s
Removed:
################################################################################
diff --git a/llvm/include/llvm/MC/MCDwarf.h b/llvm/include/llvm/MC/MCDwarf.h
index 8f648900fa535..557c713575e45 100644
--- a/llvm/include/llvm/MC/MCDwarf.h
+++ b/llvm/include/llvm/MC/MCDwarf.h
@@ -387,6 +387,7 @@ class MCDwarfLineTable {
bool hasRootFile() const { return !Header.RootFile.Name.empty(); }
+ MCDwarfFile &getRootFile() { return Header.RootFile; }
const MCDwarfFile &getRootFile() const { return Header.RootFile; }
// Report whether MD5 usage has been consistent (all-or-none).
diff --git a/llvm/lib/MC/MCContext.cpp b/llvm/lib/MC/MCContext.cpp
index c6fe3fc566554..29597088a212e 100644
--- a/llvm/lib/MC/MCContext.cpp
+++ b/llvm/lib/MC/MCContext.cpp
@@ -869,7 +869,7 @@ void MCContext::RemapDebugPaths() {
// Remap compilation directory.
remapDebugPath(CompilationDir);
- // Remap MCDwarfDirs in all compilation units.
+ // Remap MCDwarfDirs and RootFile.Name in all compilation units.
SmallString<256> P;
for (auto &CUIDTablePair : MCDwarfLineTablesCUMap) {
for (auto &Dir : CUIDTablePair.second.getMCDwarfDirs()) {
@@ -877,6 +877,12 @@ void MCContext::RemapDebugPaths() {
remapDebugPath(P);
Dir = std::string(P);
}
+
+ // Used by DW_TAG_compile_unit's DT_AT_name and DW_TAG_label's
+ // DW_AT_decl_file for DWARF v5 generated for assembly source.
+ P = CUIDTablePair.second.getRootFile().Name;
+ remapDebugPath(P);
+ CUIDTablePair.second.getRootFile().Name = std::string(P);
}
}
diff --git a/llvm/test/MC/ELF/debug-hash-file.s b/llvm/test/MC/ELF/debug-hash-file.s
index 9d4cf6ae68bdc..99e3d6dca9bba 100644
--- a/llvm/test/MC/ELF/debug-hash-file.s
+++ b/llvm/test/MC/ELF/debug-hash-file.s
@@ -23,6 +23,26 @@
// DWARF5-NEXT: dir_index: 0
// DWARF5-NOT: file_names[ 1]:
+// RUN: llvm-mc -triple=x86_64 -filetype=obj -g -dwarf-version=4 -fdebug-prefix-map=/MyTest=/src_root %s -o %t.4.o
+// RUN: llvm-dwarfdump -debug-info -debug-line %t.4.o | FileCheck %s --check-prefixes=MAP,MAP_V4
+// RUN: llvm-mc -triple=x86_64 -filetype=obj -g -dwarf-version=5 -fdebug-prefix-map=/MyTest=/src_root %s -o %t.5.o
+// RUN: llvm-dwarfdump -debug-info -debug-line %t.5.o | FileCheck %s --check-prefixes=MAP,MAP_V5
+
+// MAP-LABEL: DW_TAG_compile_unit
+// MAP: DW_AT_name ("/src_root/Inputs{{(/|\\)+}}other.S")
+// MAP-LABEL: DW_TAG_label
+// MAP: DW_AT_decl_file ("/src_root/Inputs{{(/|\\)+}}other.S")
+
+// MAP_V4: include_directories[ 1] = "/src_root/Inputs"
+// MAP_V4-NEXT: file_names[ 1]:
+// MAP_V4-NEXT: name: "other.S"
+// MAP_V4-NEXT: dir_index: 1
+
+// MAP_V5: include_directories[ 0] = "{{.*}}"
+// MAP_V5-NEXT: file_names[ 0]:
+// MAP_V5-NEXT: name: "/src_root/Inputs/other.S"
+// MAP_V5-NEXT: dir_index: 0
+
# 1 "/MyTest/Inputs/other.S"
foo:
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