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In Dwarf 3 (and Dwarf 2) attributes whose value are offsets into a

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section use the form DW_FORM_data4 whilst in Dwarf 4 and later they
use the form DW_FORM_sec_offset.

This patch updates the places where such attributes are generated to
use the appropriate form depending on the Dwarf version. The DIE entries
affected have the following tags:
DW_AT_stmt_list, DW_AT_ranges, DW_AT_location, DW_AT_GNU_pubnames,
DW_AT_GNU_pubtypes, DW_AT_GNU_addr_base, DW_AT_GNU_ranges_base

It also adds a hidden command line option "--dwarf-version=<uint>"
to llc which allows the version of Dwarf to be generated to override
what is specified in the metadata; this makes it possible to update
existing tests to check the debugging information generated for both
Dwarf 4 (the default) and Dwarf 3 using the same metadata.

Patch (slightly modified) by Keith Walker!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195391 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2013-11-21 23:46:41 +00:00
parent 46f7257ed1
commit 2d5d104c5b
9 changed files with 250 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+29 -9
View File
@@ -245,6 +245,26 @@ void CompileUnit::addLabel(DIEBlock *Die, dwarf::Form Form,
addLabel(Die, (dwarf::Attribute)0, Form, Label);
}
/// addSectionLabel - Add a Dwarf section label attribute data and value.
///
void CompileUnit::addSectionLabel(DIE *Die, dwarf::Attribute Attribute,
const MCSymbol *Label) {
if (DD->getDwarfVersion() >= 4)
addLabel(Die, Attribute, dwarf::DW_FORM_sec_offset, Label);
else
addLabel(Die, Attribute, dwarf::DW_FORM_data4, Label);
}
/// addSectionOffset - Add an offset into a section attribute data and value.
///
void CompileUnit::addSectionOffset(DIE *Die, dwarf::Attribute Attribute,
uint64_t Integer) {
if (DD->getDwarfVersion() >= 4)
addUInt(Die, Attribute, dwarf::DW_FORM_sec_offset, Integer);
else
addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
}
/// addLabelAddress - Add a dwarf label attribute data and value using
/// DW_FORM_addr or DW_FORM_GNU_addr_index.
///
@@ -282,13 +302,15 @@ void CompileUnit::addOpAddress(DIEBlock *Die, const MCSymbol *Sym) {
}
}
/// addDelta - Add a label delta attribute data and value.
/// addSectionDelta - Add a section label delta attribute data and value.
///
void CompileUnit::addDelta(DIE *Die, dwarf::Attribute Attribute,
dwarf::Form Form, const MCSymbol *Hi,
const MCSymbol *Lo) {
void CompileUnit::addSectionDelta(DIE *Die, dwarf::Attribute Attribute,
const MCSymbol *Hi, const MCSymbol *Lo) {
DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
Die->addValue(Attribute, Form, Value);
if (DD->getDwarfVersion() >= 4)
Die->addValue(Attribute, dwarf::DW_FORM_sec_offset, Value);
else
Die->addValue(Attribute, dwarf::DW_FORM_data4, Value);
}
/// addDIEEntry - Add a DIE attribute data and value.
@@ -1814,10 +1836,8 @@ DIE *CompileUnit::constructVariableDIE(DbgVariable &DV, bool isScopeAbstract) {
unsigned Offset = DV.getDotDebugLocOffset();
if (Offset != ~0U) {
addLabel(VariableDie, dwarf::DW_AT_location,
DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
: dwarf::DW_FORM_data4,
Asm->GetTempSymbol("debug_loc", Offset));
addSectionLabel(VariableDie, dwarf::DW_AT_location,
Asm->GetTempSymbol("debug_loc", Offset));
DV.setDIE(VariableDie);
return VariableDie;
}