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llvm-mirror/lib/DWARFLinker/DWARFLinkerCompileUnit.cpp
Adrian Prantl 53c8ce0f6c [dsymutil] Avoid copying swiftinterfaces from the SDK into the dsym bundle
This patch fixes a bug that would cause dsymutil to collect
.swiftinterface files for the Swift stdlib and other SDK
modules. There is no advantage in copying these since they should be
loaded from the ones bundled with LLDB's embedded Swift compiler
instead and copying them will cause LLDB to recompile them from source
instead of loading their prebuilt cached counterparts in the SDK.

rdar://problem/57463247

Differential Revisions: https://reviews.llvm.org/D75196
2020-02-26 12:22:50 -08:00

153 lines
5.0 KiB
C++

//===- DWARFLinkerCompileUnit.cpp -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DWARFLinker/DWARFLinkerCompileUnit.h"
#include "llvm/DWARFLinker/DWARFLinkerDeclContext.h"
namespace llvm {
/// Check if the DIE at \p Idx is in the scope of a function.
static bool inFunctionScope(CompileUnit &U, unsigned Idx) {
while (Idx) {
if (U.getOrigUnit().getDIEAtIndex(Idx).getTag() == dwarf::DW_TAG_subprogram)
return true;
Idx = U.getInfo(Idx).ParentIdx;
}
return false;
}
uint16_t CompileUnit::getLanguage() {
if (!Language) {
DWARFDie CU = getOrigUnit().getUnitDIE();
Language = dwarf::toUnsigned(CU.find(dwarf::DW_AT_language), 0);
}
return Language;
}
StringRef CompileUnit::getSysRoot() {
if (SysRoot.empty()) {
DWARFDie CU = getOrigUnit().getUnitDIE();
SysRoot = dwarf::toStringRef(CU.find(dwarf::DW_AT_LLVM_sysroot)).str();
}
return SysRoot;
}
void CompileUnit::markEverythingAsKept() {
unsigned Idx = 0;
setHasInterestingContent();
for (auto &I : Info) {
// Mark everything that wasn't explicit marked for pruning.
I.Keep = !I.Prune;
auto DIE = OrigUnit.getDIEAtIndex(Idx++);
// Try to guess which DIEs must go to the accelerator tables. We do that
// just for variables, because functions will be handled depending on
// whether they carry a DW_AT_low_pc attribute or not.
if (DIE.getTag() != dwarf::DW_TAG_variable &&
DIE.getTag() != dwarf::DW_TAG_constant)
continue;
Optional<DWARFFormValue> Value;
if (!(Value = DIE.find(dwarf::DW_AT_location))) {
if ((Value = DIE.find(dwarf::DW_AT_const_value)) &&
!inFunctionScope(*this, I.ParentIdx))
I.InDebugMap = true;
continue;
}
if (auto Block = Value->getAsBlock()) {
if (Block->size() > OrigUnit.getAddressByteSize() &&
(*Block)[0] == dwarf::DW_OP_addr)
I.InDebugMap = true;
}
}
}
uint64_t CompileUnit::computeNextUnitOffset() {
NextUnitOffset = StartOffset;
if (NewUnit) {
NextUnitOffset += 11 /* Header size */;
NextUnitOffset += NewUnit->getUnitDie().getSize();
}
return NextUnitOffset;
}
/// Keep track of a forward cross-cu reference from this unit
/// to \p Die that lives in \p RefUnit.
void CompileUnit::noteForwardReference(DIE *Die, const CompileUnit *RefUnit,
DeclContext *Ctxt, PatchLocation Attr) {
ForwardDIEReferences.emplace_back(Die, RefUnit, Ctxt, Attr);
}
void CompileUnit::fixupForwardReferences() {
for (const auto &Ref : ForwardDIEReferences) {
DIE *RefDie;
const CompileUnit *RefUnit;
PatchLocation Attr;
DeclContext *Ctxt;
std::tie(RefDie, RefUnit, Ctxt, Attr) = Ref;
if (Ctxt && Ctxt->getCanonicalDIEOffset())
Attr.set(Ctxt->getCanonicalDIEOffset());
else
Attr.set(RefDie->getOffset() + RefUnit->getStartOffset());
}
}
void CompileUnit::addLabelLowPc(uint64_t LabelLowPc, int64_t PcOffset) {
Labels.insert({LabelLowPc, PcOffset});
}
void CompileUnit::addFunctionRange(uint64_t FuncLowPc, uint64_t FuncHighPc,
int64_t PcOffset) {
// Don't add empty ranges to the interval map. They are a problem because
// the interval map expects half open intervals. This is safe because they
// are empty anyway.
if (FuncHighPc != FuncLowPc)
Ranges.insert(FuncLowPc, FuncHighPc, PcOffset);
this->LowPc = std::min(LowPc, FuncLowPc + PcOffset);
this->HighPc = std::max(HighPc, FuncHighPc + PcOffset);
}
void CompileUnit::noteRangeAttribute(const DIE &Die, PatchLocation Attr) {
if (Die.getTag() != dwarf::DW_TAG_compile_unit)
RangeAttributes.push_back(Attr);
else
UnitRangeAttribute = Attr;
}
void CompileUnit::noteLocationAttribute(PatchLocation Attr, int64_t PcOffset) {
LocationAttributes.emplace_back(Attr, PcOffset);
}
void CompileUnit::addNamespaceAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name) {
Namespaces.emplace_back(Name, Die);
}
void CompileUnit::addObjCAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name,
bool SkipPubSection) {
ObjC.emplace_back(Name, Die, SkipPubSection);
}
void CompileUnit::addNameAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name,
bool SkipPubSection) {
Pubnames.emplace_back(Name, Die, SkipPubSection);
}
void CompileUnit::addTypeAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name,
bool ObjcClassImplementation,
uint32_t QualifiedNameHash) {
Pubtypes.emplace_back(Name, Die, QualifiedNameHash, ObjcClassImplementation);
}
} // namespace llvm