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[DWARFv5] llvm-mc -dwarf-version does not imply -g.

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Don't provide the assembler source as the "root file" unless the user
asked to have debug info for the assembler source (with -g).

If the source doesn't provide an explicit ".file 0" then (a) use the
compilation directory as directory #0, and (b) use the file #1 info
for file #0 also.

Differential Revision: https://reviews.llvm.org/D48055

llvm-svn: 334512
This commit is contained in:
Paul Robinson 2018-06-12 16:09:03 +00:00
parent 115cd845d4
commit 263130d589
7 changed files with 37 additions and 35 deletions
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4
include/llvm/MC/MCDwarf.h
View File

@ -234,8 +234,8 @@ struct MCDwarfLineTableHeader {
private:
void emitV2FileDirTables(MCStreamer *MCOS) const;
void emitV5FileDirTables(MCStreamer *MCOS,
Optional<MCDwarfLineStr> &LineStr) const;
void emitV5FileDirTables(MCStreamer *MCOS, Optional<MCDwarfLineStr> &LineStr,
StringRef CtxCompilationDir) const;
};
class MCDwarfDwoLineTable {

21
lib/MC/MCDwarf.cpp
View File

@ -378,7 +378,8 @@ static void emitOneV5FileEntry(MCStreamer *MCOS, const MCDwarfFile &DwarfFile,
}
void MCDwarfLineTableHeader::emitV5FileDirTables(
MCStreamer *MCOS, Optional<MCDwarfLineStr> &LineStr) const {
MCStreamer *MCOS, Optional<MCDwarfLineStr> &LineStr,
StringRef CtxCompilationDir) const {
// The directory format, which is just a list of the directory paths. In a
// non-split object, these are references to .debug_line_str; in a split
// object, they are inline strings.
@ -387,14 +388,17 @@ void MCDwarfLineTableHeader::emitV5FileDirTables(
MCOS->EmitULEB128IntValue(LineStr ? dwarf::DW_FORM_line_strp
: dwarf::DW_FORM_string);
MCOS->EmitULEB128IntValue(MCDwarfDirs.size() + 1);
// Try not to emit an empty compilation directory.
const StringRef &CompDir =
CompilationDir.empty() ? CtxCompilationDir : CompilationDir;
if (LineStr) {
// Record path strings, emit references here.
LineStr->emitRef(MCOS, CompilationDir);
LineStr->emitRef(MCOS, CompDir);
for (auto &Dir : MCDwarfDirs)
LineStr->emitRef(MCOS, Dir);
} else {
// The list of directory paths. CompilationDir comes first.
MCOS->EmitBytes(CompilationDir);
// The list of directory paths. Compilation directory comes first.
MCOS->EmitBytes(CompDir);
MCOS->EmitBytes(StringRef("\0", 1));
for (auto &Dir : MCDwarfDirs) {
MCOS->EmitBytes(Dir); // The DirectoryName, and...
@ -426,9 +430,12 @@ void MCDwarfLineTableHeader::emitV5FileDirTables(
: dwarf::DW_FORM_string);
}
// Then the counted list of files. The root file is file #0, then emit the
// files as provide by .file directives.
// files as provide by .file directives. To accommodate assembler source
// written for DWARF v4 but trying to emit v5, if we didn't see a root file
// explicitly, replicate file #1.
MCOS->EmitULEB128IntValue(MCDwarfFiles.size());
emitOneV5FileEntry(MCOS, RootFile, HasMD5, HasSource, LineStr);
emitOneV5FileEntry(MCOS, RootFile.Name.empty() ? MCDwarfFiles[1] : RootFile,
HasMD5, HasSource, LineStr);
for (unsigned i = 1; i < MCDwarfFiles.size(); ++i)
emitOneV5FileEntry(MCOS, MCDwarfFiles[i], HasMD5, HasSource, LineStr);
}
@ -501,7 +508,7 @@ MCDwarfLineTableHeader::Emit(MCStreamer *MCOS, MCDwarfLineTableParams Params,
// Put out the directory and file tables. The formats vary depending on
// the version.
if (LineTableVersion >= 5)
emitV5FileDirTables(MCOS, LineStr);
emitV5FileDirTables(MCOS, LineStr, context.getCompilationDir());
else
emitV2FileDirTables(MCOS);

16
test/MC/ELF/debug-file-options.s
View File

@ -16,15 +16,15 @@
# CHECK: include_directories[ 2] = .debug_line_str[0x[[DIR2:[0-9a-f]+]]] = "dir2"
# CHECK-NOT: include_directories
# CHECK: file_names[ 0]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0:[0-9a-f]+]]] = "{{.+}}"
# CHECK-NEXT: dir_index: 0
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0:[0-9a-f]+]]] = "foo"
# CHECK-NEXT: dir_index: 1
# CHECK-NEXT: md5_checksum:
# CHECK-NEXT: source: .debug_line_str[0x[[FILE0SRC:[0-9a-f]+]]] = ""
# CHECK-NEXT: source: .debug_line_str[0x[[FILE0SRC:[0-9a-f]+]]] = "void foo() {}"
# CHECK: file_names[ 1]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE1:[0-9a-f]+]]] = "foo"
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0]]] = "foo"
# CHECK-NEXT: dir_index: 1
# CHECK-NEXT: md5_checksum: ee87e05688663173cd6043a3a15bba6e
# CHECK-NEXT: source: .debug_line_str[0x[[FILE1SRC:[0-9a-f]+]]] = "void foo() {}"
# CHECK-NEXT: source: .debug_line_str[0x[[FILE0SRC]]] = "void foo() {}"
# CHECK: file_names[ 2]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE2:[0-9a-f]+]]] = "bar"
# CHECK-NEXT: dir_index: 2
@ -35,9 +35,7 @@
# CHECK-NEXT: 0x[[DIR0]]: "{{.+}}"
# CHECK-NEXT: 0x[[DIR1]]: "dir1"
# CHECK-NEXT: 0x[[DIR2]]: "dir2"
# CHECK-NEXT: 0x[[FILE0]]: "{{.+}}"
# CHECK-NEXT: 0x[[FILE0SRC]]: ""
# CHECK-NEXT: 0x[[FILE1]]: "foo"
# CHECK-NEXT: 0x[[FILE1SRC]]: "void foo() {}"
# CHECK-NEXT: 0x[[FILE0]]: "foo"
# CHECK-NEXT: 0x[[FILE0SRC]]: "void foo() {}"
# CHECK-NEXT: 0x[[FILE2]]: "bar"
# CHECK-NEXT: 0x[[FILE2SRC]]: "void bar() {}"

9
test/MC/ELF/debug-md5.s
View File

@ -14,10 +14,10 @@
# CHECK: include_directories[ 2] = .debug_line_str[0x[[DIR2:[0-9a-f]+]]] = "dir2"
# CHECK-NOT: include_directories
# CHECK: file_names[ 0]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0:[0-9a-f]+]]] = "{{.+}}"
# CHECK-NEXT: dir_index: 0
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0:[0-9a-f]+]]] = "foo"
# CHECK-NEXT: dir_index: 1
# CHECK: file_names[ 1]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE1:[0-9a-f]+]]] = "foo"
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0]]] = "foo"
# CHECK-NEXT: dir_index: 1
# CHECK-NEXT: md5_checksum: 00112233445566778899aabbccddeeff
# CHECK: file_names[ 2]:
@ -29,6 +29,5 @@
# CHECK-NEXT: 0x[[DIR0]]: "/tmp"
# CHECK-NEXT: 0x[[DIR1]]: "dir1"
# CHECK-NEXT: 0x[[DIR2]]: "dir2"
# CHECK-NEXT: 0x[[FILE0]]: "{{.+}}"
# CHECK-NEXT: 0x[[FILE1]]: "foo"
# CHECK-NEXT: 0x[[FILE0]]: "foo"
# CHECK-NEXT: 0x[[FILE2]]: "bar"

18
test/MC/ELF/debug-source.s
View File

@ -14,13 +14,13 @@
# CHECK: include_directories[ 2] = .debug_line_str[0x[[DIR2:[0-9a-f]+]]] = "dir2"
# CHECK-NOT: include_directories
# CHECK: file_names[ 0]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0:[0-9a-f]+]]] = "{{.+}}"
# CHECK-NEXT: dir_index: 0
# CHECK-NEXT: source: .debug_line_str[0x[[FILE0SRC:[0-9a-f]+]]] = ""
# CHECK: file_names[ 1]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE1:[0-9a-f]+]]] = "foo"
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0:[0-9a-f]+]]] = "foo"
# CHECK-NEXT: dir_index: 1
# CHECK-NEXT: source: .debug_line_str[0x[[FILE1SRC:[0-9a-f]+]]] = "void foo() {}"
# CHECK-NEXT: source: .debug_line_str[0x[[FILE0SRC:[0-9a-f]+]]] = "void foo() {}"
# CHECK: file_names[ 1]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE0]]] = "foo"
# CHECK-NEXT: dir_index: 1
# CHECK-NEXT: source: .debug_line_str[0x[[FILE0SRC]]] = "void foo() {}"
# CHECK: file_names[ 2]:
# CHECK-NEXT: name: .debug_line_str[0x[[FILE2:[0-9a-f]+]]] = "bar"
# CHECK-NEXT: dir_index: 2
@ -30,9 +30,7 @@
# CHECK-NEXT: 0x[[DIR0]]: "{{.+}}"
# CHECK-NEXT: 0x[[DIR1]]: "dir1"
# CHECK-NEXT: 0x[[DIR2]]: "dir2"
# CHECK-NEXT: 0x[[FILE0]]: "{{.+}}"
# CHECK-NEXT: 0x[[FILE0SRC]]: ""
# CHECK-NEXT: 0x[[FILE1]]: "foo"
# CHECK-NEXT: 0x[[FILE1SRC]]: "void foo() {}"
# CHECK-NEXT: 0x[[FILE0]]: "foo"
# CHECK-NEXT: 0x[[FILE0SRC]]: "void foo() {}"
# CHECK-NEXT: 0x[[FILE2]]: "bar"
# CHECK-NEXT: 0x[[FILE2SRC]]: "void bar()\n{\n}"

2
test/MC/ELF/dwarf-file0.s
View File

@ -6,7 +6,7 @@
.file 0 "root.cpp"
.file 1 "header.h"
.file 2 "root.cpp"
# CHECK-5: include_directories[ 0] = ""
# CHECK-5: include_directories[ 0] = "{{.+}}"
# CHECK-4-NOT: include_directories
# CHECK-4-NOT: file_names[ 0]
# CHECK-5: file_names[ 0]:

2
tools/llvm-mc/llvm-mc.cpp
View File

@ -389,7 +389,7 @@ int main(int argc, char **argv) {
}
if (!MainFileName.empty())
Ctx.setMainFileName(MainFileName);
if (DwarfVersion >= 5) {
if (GenDwarfForAssembly && DwarfVersion >= 5) {
// DWARF v5 needs the root file as well as the compilation directory.
// If we find a '.file 0' directive that will supersede these values.
MD5 Hash;