6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-10-05 11:17:53 +00:00
Code Issues Projects Releases Wiki Activity

[DWARF parser] Refactor fetching DIE address ranges.

Browse Source 
Add a helper method to get address ranges specified in a DIE
(either by DW_AT_low_pc/DW_AT_high_pc, or by DW_AT_ranges). Use it
to untangle and simplify the code.

No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206624 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2014-04-18 17:25:46 +00:00
parent 54850bedf2
commit fe030f3dcd
7 changed files with 72 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
lib/DebugInfo/DWARFDebugInfoEntry.cpp
View File

@@ -226,39 +226,47 @@ bool DWARFDebugInfoEntryMinimal::getLowAndHighPC(const DWARFUnit *U,
return (HighPC != -1ULL);
}
void DWARFDebugInfoEntryMinimal::buildAddressRangeTable(
const DWARFUnit *U, DWARFDebugAranges *DebugAranges,
uint32_t UOffsetInAranges) const {
if (AbbrevDecl) {
if (isSubprogramDIE()) {
uint64_t LowPC, HighPC;
if (getLowAndHighPC(U, LowPC, HighPC))
DebugAranges->appendRange(UOffsetInAranges, LowPC, HighPC);
// FIXME: try to append ranges from .debug_ranges section.
}
const DWARFDebugInfoEntryMinimal *Child = getFirstChild();
while (Child) {
Child->buildAddressRangeTable(U, DebugAranges, UOffsetInAranges);
Child = Child->getSibling();
}
}
}
bool DWARFDebugInfoEntryMinimal::addressRangeContainsAddress(
const DWARFUnit *U, const uint64_t Address) const {
DWARFAddressRangesVector
DWARFDebugInfoEntryMinimal::getAddressRanges(const DWARFUnit *U) const {
if (isNULL())
return false;
return DWARFAddressRangesVector{};
// Single range specified by low/high PC.
uint64_t LowPC, HighPC;
if (getLowAndHighPC(U, LowPC, HighPC))
return (LowPC <= Address && Address <= HighPC);
// Try to get address ranges from .debug_ranges section.
if (getLowAndHighPC(U, LowPC, HighPC)) {
return DWARFAddressRangesVector{std::make_pair(LowPC, HighPC)};
}
// Multiple ranges from .debug_ranges section.
uint32_t RangesOffset =
getAttributeValueAsSectionOffset(U, DW_AT_ranges, -1U);
if (RangesOffset != -1U) {
DWARFDebugRangeList RangeList;
if (U->extractRangeList(RangesOffset, RangeList))
return RangeList.containsAddress(U->getBaseAddress(), Address);
return RangeList.getAbsoluteRanges(U->getBaseAddress());
}
return DWARFAddressRangesVector{};
}
void DWARFDebugInfoEntryMinimal::collectChildrenAddressRanges(
const DWARFUnit *U, DWARFAddressRangesVector& Ranges) const {
if (isNULL())
return;
if (isSubprogramDIE()) {
const auto &DIERanges = getAddressRanges(U);
Ranges.insert(Ranges.end(), DIERanges.begin(), DIERanges.end());
}
const DWARFDebugInfoEntryMinimal *Child = getFirstChild();
while (Child) {
Child->collectChildrenAddressRanges(U, Ranges);
Child = Child->getSibling();
}
}
bool DWARFDebugInfoEntryMinimal::addressRangeContainsAddress(
const DWARFUnit *U, const uint64_t Address) const {
for (const auto& R : getAddressRanges(U)) {
if (R.first <= Address && Address < R.second)
return true;
}
return false;
}