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The second part of support for generating dwarf for assembly source files. This

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generates the dwarf Compile Unit DIE and a dwarf subprogram DIE for each
non-temporary label.

The next part will be to get the clang driver to enable this when assembling
a .s file.  rdar://9275556


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146262 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kevin Enderby 2011-12-09 18:09:40 +00:00
parent bf67a99c35
commit 94c2e85bea
9 changed files with 554 additions and 0 deletions
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28
include/llvm/MC/MCContext.h
View File

@ -108,6 +108,16 @@ namespace llvm {
/// The default initial text section that we generate dwarf debugging line
/// info for when generating dwarf assembly source files.
const MCSection *GenDwarfSection;
/// Symbols created for the start and end of this section.
MCSymbol *GenDwarfSectionStartSym, *GenDwarfSectionEndSym;
/// The information gathered from labels that will have dwarf subprogram
/// entries when generating dwarf assembly source files.
std::vector<const MCGenDwarfSubprogramEntry *> MCGenDwarfSubprogramEntries;
/// The string to embed in the debug information for the compile unit, if
/// non-empty.
StringRef DwarfDebugFlags;
/// Honor temporary labels, this is useful for debugging semantic
/// differences between temporary and non-temporary labels (primarily on
@ -269,6 +279,24 @@ namespace llvm {
unsigned nextGenDwarfFileNumber() { return ++GenDwarfFileNumber; }
const MCSection *getGenDwarfSection() { return GenDwarfSection; }
void setGenDwarfSection(const MCSection *Sec) { GenDwarfSection = Sec; }
MCSymbol *getGenDwarfSectionStartSym() { return GenDwarfSectionStartSym; }
void setGenDwarfSectionStartSym(MCSymbol *Sym) {
GenDwarfSectionStartSym = Sym;
}
MCSymbol *getGenDwarfSectionEndSym() { return GenDwarfSectionEndSym; }
void setGenDwarfSectionEndSym(MCSymbol *Sym) {
GenDwarfSectionEndSym = Sym;
}
const std::vector<const MCGenDwarfSubprogramEntry *>
&getMCGenDwarfSubprogramEntries() const {
return MCGenDwarfSubprogramEntries;
}
void addMCGenDwarfSubprogramEntry(const MCGenDwarfSubprogramEntry *E) {
MCGenDwarfSubprogramEntries.push_back(E);
}
void setDwarfDebugFlags(StringRef S) { DwarfDebugFlags = S; }
StringRef getDwarfDebugFlags() { return DwarfDebugFlags; }
/// @}

42
include/llvm/MC/MCDwarf.h
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@ -31,6 +31,8 @@ namespace llvm {
class MCSymbol;
class MCObjectStreamer;
class raw_ostream;
class SourceMgr;
class SMLoc;
/// MCDwarfFile - Instances of this class represent the name of the dwarf
/// .file directive and its associated dwarf file number in the MC file,
@ -227,6 +229,46 @@ namespace llvm {
int64_t LineDelta, uint64_t AddrDelta);
};
class MCGenDwarfInfo {
public:
//
// When generating dwarf for assembly source files this emits the Dwarf
// sections.
//
static void Emit(MCStreamer *MCOS);
};
// When generating dwarf for assembly source files this is the info that is
// needed to be gathered for each symbol that will have a dwarf2_subprogram.
class MCGenDwarfSubprogramEntry {
private:
// Name of the symbol without a leading underbar, if any.
StringRef Name;
// The dwarf file number this symbol is in.
unsigned FileNumber;
// The line number this symbol is at.
unsigned LineNumber;
// The low_pc for the dwarf2_subprogram is taken from this symbol. The
// high_pc is taken from the next symbol's value or the end of the section
// for the last symbol
MCSymbol *Label;
public:
MCGenDwarfSubprogramEntry(StringRef name, unsigned fileNumber,
unsigned lineNumber, MCSymbol *label) :
Name(name), FileNumber(fileNumber), LineNumber(lineNumber), Label(label){}
StringRef getName() const { return Name; }
unsigned getFileNumber() const { return FileNumber; }
unsigned getLineNumber() const { return LineNumber; }
MCSymbol *getLabel() const { return Label; }
// This is called when label is created when we are generating dwarf for
// assembly source files.
static void Make(MCSymbol *Symbol, MCStreamer *MCOS, SourceMgr &SrcMgr,
SMLoc &Loc);
};
class MCCFIInstruction {
public:
enum OpType { SameValue, Remember, Restore, Move, RelMove };

1
include/llvm/Support/Dwarf.h
View File

@ -526,6 +526,7 @@ enum dwarf_constants {
DW_LANG_D = 0x0013,
DW_LANG_Python = 0x0014,
DW_LANG_lo_user = 0x8000,
DW_LANG_Mips_Assembler = 0x8001,
DW_LANG_hi_user = 0xffff,
// Identifier case codes

4
lib/MC/MCAsmStreamer.cpp
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@ -1284,6 +1284,10 @@ void MCAsmStreamer::Finish() {
if (getContext().hasDwarfFiles() && !UseLoc)
MCDwarfFileTable::Emit(this);
// If we are generating dwarf for assembly source files dump out the sections.
if (getContext().getGenDwarfForAssembly())
MCGenDwarfInfo::Emit(this);
if (!UseCFI)
EmitFrames(false);
}

339
lib/MC/MCDwarf.cpp
View File

@ -19,9 +19,12 @@
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Config/config.h"
using namespace llvm;
// Given a special op, return the address skip amount (in units of
@ -423,6 +426,342 @@ void MCDwarfFile::dump() const {
print(dbgs());
}
// Utility function to write a tuple for .debug_abbrev.
static void EmitAbbrev(MCStreamer *MCOS, uint64_t Name, uint64_t Form) {
MCOS->EmitULEB128IntValue(Name);
MCOS->EmitULEB128IntValue(Form);
}
// When generating dwarf for assembly source files this emits
// the data for .debug_abbrev section which contains three DIEs.
static void EmitGenDwarfAbbrev(MCStreamer *MCOS) {
MCContext &context = MCOS->getContext();
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfAbbrevSection());
// DW_TAG_compile_unit DIE abbrev (1).
MCOS->EmitULEB128IntValue(1);
MCOS->EmitULEB128IntValue(dwarf::DW_TAG_compile_unit);
MCOS->EmitIntValue(dwarf::DW_CHILDREN_yes, 1);
EmitAbbrev(MCOS, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4);
EmitAbbrev(MCOS, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr);
EmitAbbrev(MCOS, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr);
EmitAbbrev(MCOS, dwarf::DW_AT_name, dwarf::DW_FORM_string);
EmitAbbrev(MCOS, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string);
StringRef DwarfDebugFlags = context.getDwarfDebugFlags();
if (!DwarfDebugFlags.empty())
EmitAbbrev(MCOS, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string);
EmitAbbrev(MCOS, dwarf::DW_AT_producer, dwarf::DW_FORM_string);
EmitAbbrev(MCOS, dwarf::DW_AT_language, dwarf::DW_FORM_data2);
EmitAbbrev(MCOS, 0, 0);
// DW_TAG_subprogram DIE abbrev (2).
MCOS->EmitULEB128IntValue(2);
MCOS->EmitULEB128IntValue(dwarf::DW_TAG_subprogram);
MCOS->EmitIntValue(dwarf::DW_CHILDREN_yes, 1);
EmitAbbrev(MCOS, dwarf::DW_AT_name, dwarf::DW_FORM_string);
EmitAbbrev(MCOS, dwarf::DW_AT_decl_file, dwarf::DW_FORM_data4);
EmitAbbrev(MCOS, dwarf::DW_AT_decl_line, dwarf::DW_FORM_data4);
EmitAbbrev(MCOS, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr);
EmitAbbrev(MCOS, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr);
EmitAbbrev(MCOS, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag);
EmitAbbrev(MCOS, 0, 0);
// DW_TAG_unspecified_parameters DIE abbrev (3).
MCOS->EmitULEB128IntValue(3);
MCOS->EmitULEB128IntValue(dwarf::DW_TAG_unspecified_parameters);
MCOS->EmitIntValue(dwarf::DW_CHILDREN_no, 1);
EmitAbbrev(MCOS, 0, 0);
// Terminate the abbreviations for this compilation unit.
MCOS->EmitIntValue(0, 1);
}
// When generating dwarf for assembly source files this emits the data for
// .debug_aranges section. Which contains a header and a table of pairs of
// PointerSize'ed values for the address and size of section(s) with line table
// entries (just the default .text in our case) and a terminating pair of zeros.
static void EmitGenDwarfAranges(MCStreamer *MCOS) {
MCContext &context = MCOS->getContext();
// Create a symbol at the end of the section that we are creating the dwarf
// debugging info to use later in here as part of the expression to calculate
// the size of the section for the table.
MCOS->SwitchSection(context.getGenDwarfSection());
MCSymbol *SectionEndSym = context.CreateTempSymbol();
MCOS->EmitLabel(SectionEndSym);
context.setGenDwarfSectionEndSym(SectionEndSym);
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection());
// This will be the length of the .debug_aranges section, first account for
// the size of each item in the header (see below where we emit these items).
int Length = 4 + 2 + 4 + 1 + 1;
// Figure the padding after the header before the table of address and size
// pairs who's values are PointerSize'ed.
const MCAsmInfo &asmInfo = context.getAsmInfo();
int AddrSize = asmInfo.getPointerSize();
int Pad = 2 * AddrSize - (Length & (2 * AddrSize - 1));
if (Pad == 2 * AddrSize)
Pad = 0;
Length += Pad;
// Add the size of the pair of PointerSize'ed values for the address and size
// of the one default .text section we have in the table.
Length += 2 * AddrSize;
// And the pair of terminating zeros.
Length += 2 * AddrSize;
// Emit the header for this section.
// The 4 byte length not including the 4 byte value for the length.
MCOS->EmitIntValue(Length - 4, 4);
// The 2 byte version, which is 2.
MCOS->EmitIntValue(2, 2);
// The 4 byte offset to the compile unit in the .debug_info from the start
// of the .debug_info, it is at the start of that section so this is zero.
MCOS->EmitIntValue(0, 4);
// The 1 byte size of an address.
MCOS->EmitIntValue(AddrSize, 1);
// The 1 byte size of a segment descriptor, we use a value of zero.
MCOS->EmitIntValue(0, 1);
// Align the header with the padding if needed, before we put out the table.
for(int i = 0; i < Pad; i++)
MCOS->EmitIntValue(0, 1);
// Now emit the table of pairs of PointerSize'ed values for the section(s)
// address and size, in our case just the one default .text section.
const MCExpr *Addr = MCSymbolRefExpr::Create(
context.getGenDwarfSectionStartSym(), MCSymbolRefExpr::VK_None, context);
const MCExpr *Size = MakeStartMinusEndExpr(*MCOS,
*context.getGenDwarfSectionStartSym(), *SectionEndSym, 0);
MCOS->EmitAbsValue(Addr, AddrSize);
MCOS->EmitAbsValue(Size, AddrSize);
// And finally the pair of terminating zeros.
MCOS->EmitIntValue(0, AddrSize);
MCOS->EmitIntValue(0, AddrSize);
}
// When generating dwarf for assembly source files this emits the data for
// .debug_info section which contains three parts. The header, the compile_unit
// DIE and a list of subprogram DIEs.
static void EmitGenDwarfInfo(MCStreamer *MCOS) {
MCContext &context = MCOS->getContext();
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection());
// Create a symbol at the start and end of this section used in here for the
// expression to calculate the length in the header.
MCSymbol *InfoStart = context.CreateTempSymbol();
MCOS->EmitLabel(InfoStart);
MCSymbol *InfoEnd = context.CreateTempSymbol();
// First part: the header.
// The 4 byte total length of the information for this compilation unit, not
// including these 4 bytes.
const MCExpr *Length = MakeStartMinusEndExpr(*MCOS, *InfoStart, *InfoEnd, 4);
MCOS->EmitAbsValue(Length, 4);
// The 2 byte DWARF version, which is 2.
MCOS->EmitIntValue(2, 2);
// The 4 byte offset to the debug abbrevs from the start of the .debug_abbrev,
// it is at the start of that section so this is zero.
MCOS->EmitIntValue(0, 4);
const MCAsmInfo &asmInfo = context.getAsmInfo();
int AddrSize = asmInfo.getPointerSize();
// The 1 byte size of an address.
MCOS->EmitIntValue(AddrSize, 1);
// Second part: the compile_unit DIE.
// The DW_TAG_compile_unit DIE abbrev (1).
MCOS->EmitULEB128IntValue(1);
// DW_AT_stmt_list, a 4 byte offset from the start of the .debug_line section,
// which is at the start of that section so this is zero.
MCOS->EmitIntValue(0, 4);
// AT_low_pc, the first address of the default .text section.
const MCExpr *Start = MCSymbolRefExpr::Create(
context.getGenDwarfSectionStartSym(), MCSymbolRefExpr::VK_None, context);
MCOS->EmitAbsValue(Start, AddrSize);
// AT_high_pc, the last address of the default .text section.
const MCExpr *End = MCSymbolRefExpr::Create(
context.getGenDwarfSectionEndSym(), MCSymbolRefExpr::VK_None, context);
MCOS->EmitAbsValue(End, AddrSize);
// AT_name, the name of the source file. Reconstruct from the first directory
// and file table entries.
const std::vector<StringRef> &MCDwarfDirs =
context.getMCDwarfDirs();
if (MCDwarfDirs.size() > 0) {
MCOS->EmitBytes(MCDwarfDirs[0], 0);
MCOS->EmitBytes("/", 0);
}
const std::vector<MCDwarfFile *> &MCDwarfFiles =
MCOS->getContext().getMCDwarfFiles();
MCOS->EmitBytes(MCDwarfFiles[1]->getName(), 0);
MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string.
// AT_comp_dir, the working directory the assembly was done in.
llvm::sys::Path CWD = llvm::sys::Path::GetCurrentDirectory();
MCOS->EmitBytes(StringRef(CWD.c_str()), 0);
MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string.
// AT_APPLE_flags, the command line arguments of the assembler tool.
StringRef DwarfDebugFlags = context.getDwarfDebugFlags();
if (!DwarfDebugFlags.empty()){
MCOS->EmitBytes(DwarfDebugFlags, 0);
MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string.
}
// AT_producer, the version of the assembler tool.
MCOS->EmitBytes(StringRef("llvm-mc (based on LLVM "), 0);
MCOS->EmitBytes(StringRef(PACKAGE_VERSION), 0);
MCOS->EmitBytes(StringRef(")"), 0);
MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string.
// AT_language, a 4 byte value. We use DW_LANG_Mips_Assembler as the dwarf2
// draft has no standard code for assembler.
MCOS->EmitIntValue(dwarf::DW_LANG_Mips_Assembler, 2);
// Third part: the list of subprogram DIEs.
// Loop on saved info for dwarf subprograms and create the DIEs for them.
const std::vector<const MCGenDwarfSubprogramEntry *> &Entries =
MCOS->getContext().getMCGenDwarfSubprogramEntries();
for (std::vector<const MCGenDwarfSubprogramEntry *>::const_iterator it =
Entries.begin(), ie = Entries.end(); it != ie;
++it) {
const MCGenDwarfSubprogramEntry *Entry = *it;
// The DW_TAG_subprogram DIE abbrev (2).
MCOS->EmitULEB128IntValue(2);
// AT_name, of the label without any leading underbar.
MCOS->EmitBytes(Entry->getName(), 0);
MCOS->EmitIntValue(0, 1); // NULL byte to terminate the string.
// AT_decl_file, index into the file table.
MCOS->EmitIntValue(Entry->getFileNumber(), 4);
// AT_decl_line, source line number.
MCOS->EmitIntValue(Entry->getLineNumber(), 4);
// AT_low_pc, start address of the label.
const MCExpr *AT_low_pc = MCSymbolRefExpr::Create(Entry->getLabel(),
MCSymbolRefExpr::VK_None, context);
MCOS->EmitAbsValue(AT_low_pc, AddrSize);
// AT_high_pc, end address which is the next label or end of the section.
std::vector<const MCGenDwarfSubprogramEntry *>::const_iterator next = it+1;
if (next != Entries.end()){
const MCGenDwarfSubprogramEntry *NextEntry = *next;
const MCExpr *AT_high_pc = MCSymbolRefExpr::Create(NextEntry->getLabel(),
MCSymbolRefExpr::VK_None, context);
MCOS->EmitAbsValue(AT_high_pc, AddrSize);
} else {
MCOS->EmitAbsValue(End, AddrSize);
}
// DW_AT_prototyped, a one byte flag value of 0 saying we have no prototype.
MCOS->EmitIntValue(0, 1);
// The DW_TAG_unspecified_parameters DIE abbrev (3).
MCOS->EmitULEB128IntValue(3);
// Add the NULL DIE terminating the DW_TAG_unspecified_parameters DIE's.
MCOS->EmitIntValue(0, 1);
}
// Deallocate the MCGenDwarfSubprogramEntry classes that saved away the info
// for the dwarf subprograms.
for (std::vector<const MCGenDwarfSubprogramEntry *>::const_iterator it =
Entries.begin(), ie = Entries.end(); it != ie;
++it) {
const MCGenDwarfSubprogramEntry *Entry = *it;
delete Entry;
}
// Add the NULL DIE terminating the Compile Unit DIE's.
MCOS->EmitIntValue(0, 1);
// Now set the value of the symbol at the end of the info section.
MCOS->EmitLabel(InfoEnd);
}
//
// When generating dwarf for assembly source files this emits the Dwarf
// sections.
//
void MCGenDwarfInfo::Emit(MCStreamer *MCOS) {
// Create the dwarf sections in this order (.debug_line already created).
MCContext &context = MCOS->getContext();
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection());
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfAbbrevSection());
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection());
// If there are no line table entries then do not emit any section contents.
if (context.getMCLineSections().empty())
return;
// Output the data for .debug_aranges section.
EmitGenDwarfAranges(MCOS);
// Output the data for .debug_abbrev section.
EmitGenDwarfAbbrev(MCOS);
// Output the data for .debug_info section.
EmitGenDwarfInfo(MCOS);
}
//
// When generating dwarf for assembly source files this is called when symbol
// for a label is created. If this symbol is not a temporary and is in the
// section that dwarf is being generated for, save the needed info to create
// a dwarf subprogram.
//
void MCGenDwarfSubprogramEntry::Make(MCSymbol *Symbol, MCStreamer *MCOS,
SourceMgr &SrcMgr, SMLoc &Loc) {
// We won't create dwarf subprogram's for temporary symbols or symbols not in
// the default text.
if (Symbol->isTemporary())
return;
MCContext &context = MCOS->getContext();
if (context.getGenDwarfSection() != MCOS->getCurrentSection())
return;
// The dwarf subprogram's name does not have the symbol name's leading
// underbar if any.
StringRef Name = Symbol->getName();
if (Name.startswith("_"))
Name = Name.substr(1, Name.size()-1);
// Get the dwarf file number to be used for the dwarf subprogram.
unsigned FileNumber = context.getGenDwarfFileNumber();
// Finding the line number is the expensive part which is why we just don't
// pass it in as for some symbols we won't create a dwarf subprogram.
int CurBuffer = SrcMgr.FindBufferContainingLoc(Loc);
unsigned LineNumber = SrcMgr.FindLineNumber(Loc, CurBuffer);
// We create a temporary symbol for use for the AT_high_pc and AT_low_pc
// values so that they don't have things like an ARM thumb bit from the
// original symbol. So when used they won't get a low bit set after
// relocation.
MCSymbol *Label = context.CreateTempSymbol();
MCOS->EmitLabel(Label);
// Create and entry for the info and add it to the other entries.
MCGenDwarfSubprogramEntry *Entry =
new MCGenDwarfSubprogramEntry(Name, FileNumber, LineNumber, Label);
MCOS->getContext().addMCGenDwarfSubprogramEntry(Entry);
}
static int getDataAlignmentFactor(MCStreamer &streamer) {
MCContext &context = streamer.getContext();
const MCAsmInfo &asmInfo = context.getAsmInfo();

4
lib/MC/MCObjectStreamer.cpp
View File

@ -260,5 +260,9 @@ void MCObjectStreamer::Finish() {
if (getContext().hasDwarfFiles())
MCDwarfFileTable::Emit(this);
// If we are generating dwarf for assembly source files dump out the sections.
if (getContext().getGenDwarfForAssembly())
MCGenDwarfInfo::Emit(this);
getAssembler().Finish();
}

9
lib/MC/MCParser/AsmParser.cpp
View File

@ -468,6 +468,9 @@ bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
// section and generate a .file directive.
if (getContext().getGenDwarfForAssembly()) {
getContext().setGenDwarfSection(getStreamer().getCurrentSection());
MCSymbol *SectionStartSym = getContext().CreateTempSymbol();
getStreamer().EmitLabel(SectionStartSym);
getContext().setGenDwarfSectionStartSym(SectionStartSym);
getStreamer().EmitDwarfFileDirective(getContext().nextGenDwarfFileNumber(),
StringRef(), SrcMgr.getMemoryBuffer(CurBuffer)->getBufferIdentifier());
}
@ -1047,6 +1050,12 @@ bool AsmParser::ParseStatement() {
// Emit the label.
Out.EmitLabel(Sym);
// If we are generating dwarf for assembly source files then gather the
// info to make a dwarf subprogram entry for this label if needed.
if (getContext().getGenDwarfForAssembly())
MCGenDwarfSubprogramEntry::Make(Sym, &getStreamer(), getSourceManager(),
IDLoc);
// Consume any end of statement token, if present, to avoid spurious
// AddBlankLine calls().
if (Lexer.is(AsmToken::EndOfStatement)) {

113
test/MC/MachO/gen-dwarf.s Normal file
View File

@ -0,0 +1,113 @@
// RUN: llvm-mc -g -triple i386-apple-darwin10 %s -filetype=obj -o %t
// RUN: llvm-dwarfdump %t | FileCheck %s
.globl _bar
_bar:
movl $0, %eax
L1: leave
ret
_foo:
nop
.data
_x: .long 1
// CHECK: file format Mach-O 32-bit i386
// CHECK: .debug_abbrev contents:
// CHECK: Abbrev table for offset: 0x00000000
// CHECK: [1] DW_TAG_compile_unit DW_CHILDREN_yes
// CHECK: DW_AT_stmt_list DW_FORM_data4
// CHECK: DW_AT_low_pc DW_FORM_addr
// CHECK: DW_AT_high_pc DW_FORM_addr
// CHECK: DW_AT_name DW_FORM_string
// CHECK: DW_AT_comp_dir DW_FORM_string
// CHECK: DW_AT_producer DW_FORM_string
// CHECK: DW_AT_language DW_FORM_data2
// CHECK: [2] DW_TAG_subprogram DW_CHILDREN_yes
// CHECK: DW_AT_name DW_FORM_string
// CHECK: DW_AT_decl_file DW_FORM_data4
// CHECK: DW_AT_decl_line DW_FORM_data4
// CHECK: DW_AT_low_pc DW_FORM_addr
// CHECK: DW_AT_high_pc DW_FORM_addr
// CHECK: DW_AT_prototyped DW_FORM_flag
// CHECK: [3] DW_TAG_unspecified_parameters DW_CHILDREN_no
// CHECK: .debug_info contents:
// We don't check the leading addresses these are at.
// CHECK: DW_TAG_compile_unit [1] *
// CHECK: DW_AT_stmt_list [DW_FORM_data4] (0x00000000)
// CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
// CHECK: DW_AT_high_pc [DW_FORM_addr] (0x0000000000000008)
// We don't check the file name as it is a temp directory
// CHECK: DW_AT_name [DW_FORM_string]
// We don't check the DW_AT_comp_dir which is the current working directory
// CHECK: DW_AT_producer [DW_FORM_string] ("llvm-mc (based on LLVM 3.1svn)")
// CHECK: DW_AT_language [DW_FORM_data2] (0x8001)
// CHECK: DW_TAG_subprogram [2] *
// CHECK: DW_AT_name [DW_FORM_string] ("bar")
// CHECK: DW_AT_decl_file [DW_FORM_data4] (0x00000001)
// CHECK: DW_AT_decl_line [DW_FORM_data4] (0x00000005)
// CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
// CHECK: DW_AT_high_pc [DW_FORM_addr] (0x0000000000000007)
// CHECK: DW_AT_prototyped [DW_FORM_flag] (0x00)
// CHECK: DW_TAG_unspecified_parameters [3]
// CHECK: NULL
// CHECK: DW_TAG_subprogram [2] *
// CHECK: DW_AT_name [DW_FORM_string] ("foo")
// CHECK: DW_AT_decl_file [DW_FORM_data4] (0x00000001)
// CHECK: DW_AT_decl_line [DW_FORM_data4] (0x00000009)
// CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000007)
// CHECK: DW_AT_high_pc [DW_FORM_addr] (0x0000000000000008)
// CHECK: DW_AT_prototyped [DW_FORM_flag] (0x00)
// CHECK: DW_TAG_unspecified_parameters [3]
// CHECK: NULL
// CHECK: NULL
// CHECK: .debug_aranges contents:
// CHECK: Address Range Header: length = 0x0000001c, version = 0x0002, cu_offset = 0x00000000, addr_size = 0x04, seg_size = 0x00
// CHECK: .debug_lines contents:
// CHECK: Line table prologue:
// We don't check the total_length as it includes lengths of temp paths
// CHECK: version: 2
// We don't check the prologue_length as it too includes lengths of temp paths
// CHECK: min_inst_length: 1
// CHECK: default_is_stmt: 1
// CHECK: line_base: -5
// CHECK: line_range: 14
// CHECK: opcode_base: 13
// CHECK: standard_opcode_lengths[DW_LNS_copy] = 0
// CHECK: standard_opcode_lengths[DW_LNS_advance_pc] = 1
// CHECK: standard_opcode_lengths[DW_LNS_advance_line] = 1
// CHECK: standard_opcode_lengths[DW_LNS_set_file] = 1
// CHECK: standard_opcode_lengths[DW_LNS_set_column] = 1
// CHECK: standard_opcode_lengths[DW_LNS_negate_stmt] = 0
// CHECK: standard_opcode_lengths[DW_LNS_set_basic_block] = 0
// CHECK: standard_opcode_lengths[DW_LNS_const_add_pc] = 0
// CHECK: standard_opcode_lengths[DW_LNS_fixed_advance_pc] = 1
// CHECK: standard_opcode_lengths[DW_LNS_set_prologue_end] = 0
// CHECK: standard_opcode_lengths[DW_LNS_set_epilogue_begin] = 0
// CHECK: standard_opcode_lengths[DW_LNS_set_isa] = 1
// We don't check include_directories as it has a temp path
// CHECK: Dir Mod Time File Len File Name
// CHECK: ---- ---------- ---------- ---------------------------
// CHECK: file_names[ 1] 1 0x00000000 0x00000000 gen-dwarf.s
// CHECK: Address Line Column File ISA Flags
// CHECK: ------------------ ------ ------ ------ --- -------------
// CHECK: 0x0000000000000000 6 0 1 0 is_stmt
// CHECK: 0x0000000000000005 7 0 1 0 is_stmt
// CHECK: 0x0000000000000006 8 0 1 0 is_stmt
// CHECK: 0x0000000000000007 10 0 1 0 is_stmt
// CHECK: 0x0000000000000008 10 0 1 0 is_stmt end_sequence

14
tools/llvm-mc/llvm-mc.cpp
View File

@ -234,6 +234,17 @@ static tool_output_file *GetOutputStream() {
return Out;
}
static std::string DwarfDebugFlags;
static void setDwarfDebugFlags(int argc, char **argv) {
if (!getenv("RC_DEBUG_OPTIONS"))
return;
for (int i = 0; i < argc; i++) {
DwarfDebugFlags += argv[i];
if (i + 1 < argc)
DwarfDebugFlags += " ";
}
}
static int AsLexInput(const char *ProgName) {
OwningPtr<MemoryBuffer> BufferPtr;
if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr)) {
@ -382,6 +393,8 @@ static int AssembleInput(const char *ProgName) {
Ctx.setAllowTemporaryLabels(false);
Ctx.setGenDwarfForAssembly(GenDwarfForAssembly);
if (!DwarfDebugFlags.empty())
Ctx.setDwarfDebugFlags(StringRef(DwarfDebugFlags));
// Package up features to be passed to target/subtarget
std::string FeaturesStr;
@ -508,6 +521,7 @@ int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
TripleName = Triple::normalize(TripleName);
setDwarfDebugFlags(argc, argv);
switch (Action) {
default: