Lots of code around LLDB was directly accessing the target's section
load list. This NFC patch makes the section load list private so the
Target class can access it, but everyone else now uses accessor
functions. This allows us to control the resolving of addresses and will
allow for functionality in LLDB which can lazily resolve addresses in
JIT plug-ins with a future patch.
Note that PointerUnion::{is,get} have been soft deprecated in
PointerUnion.h:
// FIXME: Replace the uses of is(), get() and dyn_cast() with
// isa<T>, cast<T> and the llvm::dyn_cast<T>
Compared to the python version, this also does type checking and error
handling, so it's slightly longer, however, it's still comfortably
under 500 lines.
Relanding with more explicit type conversions.
This reverts commit f6012a209d.
Revert "[lldb] Add cast to fix compile error on 32-but platforms"
This reverts commit d300337e93.
Revert "[lldb] Improve log message to include missing strings"
This reverts commit 0be3348485.
Revert "[lldb] Add comment"
This reverts commit e2bb47443d.
Revert "[lldb] Implement a formatter bytecode interpreter in C++"
This reverts commit 9a9c1d4a61.
Compared to the python version, this also does type checking and error
handling, so it's slightly longer, however, it's still comfortably
under 500 lines.
Add support for type summaries embedded into the binary.
These embedded summaries will typically be generated by Swift macros,
but can also be generated by any other means.
rdar://115184658
Resubmissions of https://github.com/llvm/llvm-project/pull/112596 with
buildbot fixes.
Allow LLDB to parse the dynamic symbol table from an ELF file or memory
image in an ELF file that has no section headers. This patch uses the
ability to parse the PT_DYNAMIC segment and find the DT_SYMTAB,
DT_SYMENT, DT_HASH or DT_GNU_HASH to find and parse the dynamic symbol
table if the section headers are not present. It also adds a helper
function to read data from a .dynamic key/value pair entry correctly
from the file or from memory.
Allow LLDB to parse the dynamic symbol table from an ELF file or memory
image in an ELF file that has no section headers. This patch uses the
ability to parse the PT_DYNAMIC segment and find the DT_SYMTAB,
DT_SYMENT, DT_HASH or DT_GNU_HASH to find and parse the dynamic symbol
table if the section headers are not present. It also adds a helper
function to read data from a .dynamic key/value pair entry correctly
from the file or from memory.
This patch adds desired feature flags in JIT compiler to enable
hard-float instructions if target supports them and allows to use floats
and doubles in lldb expressions.
Fited tests:
lldb-shell :: Expr/TestAnonNamespaceParamFunc.cpp
lldb-shell :: Expr/TestIRMemoryMap.test
lldb-shell :: Expr/TestStringLiteralExpr.test
lldb-shell :: SymbolFile/DWARF/debug-types-expressions.test
Similar as #99336
Depens on: https://github.com/llvm/llvm-project/pull/114741
Reviewed By: SixWeining
Pull Request: https://github.com/llvm/llvm-project/pull/114742
This patch removes all of the Set.* methods from Status.
This cleanup is part of a series of patches that make it harder use the
anti-pattern of keeping a long-lives Status object around and updating
it while dropping any errors it contains on the floor.
This patch is largely NFC, the more interesting next steps this enables
is to:
1. remove Status.Clear()
2. assert that Status::operator=() never overwrites an error
3. remove Status::operator=()
Note that step (2) will bring 90% of the benefits for users, and step
(3) will dramatically clean up the error handling code in various
places. In the end my goal is to convert all APIs that are of the form
` ResultTy DoFoo(Status& error)
`
to
` llvm::Expected<ResultTy> DoFoo()
`
How to read this patch?
The interesting changes are in Status.h and Status.cpp, all other
changes are mostly
` perl -pi -e 's/\.SetErrorString/ = Status::FromErrorString/g' $(git
grep -l SetErrorString lldb/source)
`
plus the occasional manual cleanup.
This patch improves the ability of a ObjectFileELF instance to read the
.dynamic section. It adds the ability to read the .dynamic section from
the PT_DYNAMIC program header which is useful for ELF files that have no
section headers and for ELF files that are read from memory. It cleans
up the usage of the .dynamic entries so that
ObjectFileELF::ParseDynamicSymbols() is the only code that parses
.dynamic entries, teaches that function the read and store the string
values for each .dynamic entry. We now dump the .dynamic entries in the
output of "image dump objfile". It also cleans up the code that gets the
dynamic string table so that it can grab it from the DT_STRTAB and
DT_STRSZ .dynamic entries for when we have a ELF file with no section
headers or we are reading it from memory.
This patch improves the ability of a ObjectFileELF instance to read the .dynamic section. It adds the ability to read the .dynamic section from the PT_DYNAMIC program header which is useful for ELF files that have no section headers and for ELF files that are read from memory. It cleans up the usage of the .dynamic entries so that ObjectFileELF::ParseDynamicSymbols() is the only code that parses .dynamic entries, teaches that function the read and store the string values for each .dynamic entry. We now dump the .dynamic entries in the output of "image dump objfile". It also cleans up the code that gets the dynamic string table so that it can grab it from the DT_STRTAB and DT_STRSZ .dynamic entries for when we have a ELF file with no section headers or we are reading it from memory.
.sbss section was recognized as eSectionTypeOther, but has to be
eSectionTypeZeroFill.
Fixed tests for RISCV target:
TestClassLoadingViaMemberTypedef.TestCase
TestClassTemplateNonTypeParameterPack.TestCaseClassTemplateNonTypeParameterPack
TestThreadSelectionBug.TestThreadSelectionBug
lldbsuite.test.lldbtest.TestOffsetof
lldbsuite.test.lldbtest.TestOffsetofCpp
TestTargetDumpTypeSystem.TestCase
TestCPP11EnumTypes.CPP11EnumTypesTestCase
TestCppIsTypeComplete.TestCase
TestExprCrash.ExprCrashTestCase
TestDebugIndexCache.DebugIndexCacheTestcase
PT_LOAD and PT_TLS segments are top level sections in the ObjectFileELF
section list. The two segments can often have the same program header
p_vaddr and p_paddr values and this can cause section load list issues
in LLDB if we load the PT_TLS segments. What happens is the
SectionLoadList::m_addr_to_sect, when a library is loaded, will first
map one of the sections named "PT_LOAD[0]" with the load address that
matches the p_vaddr entry from the program header. Then the "PT_TLS[0]"
would come along and try to load this section at the same address. This
would cause the "PT_LOAD[0]" section to be unloaded as the
SectionLoadList::m_addr_to_sect would replace the value for the matching
p_vaddr with the last section to be seen. The sizes of the PT_TLS and
PT_LOAD that have the same p_vaddr value don't need to have the same
byte size, so this could cause lookups to fail for an addresses in the
"PT_LOAD[0]" section or any of its children if the offset is greater
than the offset size of the PT_TLS segment. It could also cause us to
incorrectly attribute addresses from the "PT_LOAD[0]" to the "PT_TLS[0]"
segment when doing lookups for offset that are less than the size of the
PT_TLS segment.
This fix stops us from loading PT_TLS segments in the section load lists
and will prevent the bugs that resulted from this. No addresses the the
DWARF refer to TLS data with a "file address" in any way. They all have
TLS DWARF location expressions to locate these variables. We also don't
have any support for having actual thread specific sections and having
those sections resolve to something different for each thread, so there
currently is no point in loading thread specific sections. Both the
ObjectFileMachO and ObjectFileCOFF both ignore thread specific sections
at the moment, so this brings the ObjectFileELF to parity with those
plug-ins.
I added a test into an existing test to verify that things work as
expected.
Prior to this fix with a real binary, the output of "target dump
section-load-list" would look like this for the old LLDB:
```
// (lldb) target dump section-load-list
// addr = 0x0000000000000000, section = 0x55d46ab8c510: 0xfffffffffffffffd container [0x0000000000000000-0x0000000000000628) r-- 0x00000000 0x00000628 0x00000000 a.out.PT_LOAD[0]
// addr = 0x0000000000001000, section = 0x55d46ab8b0c0: 0xfffffffffffffffc container [0x0000000000001000-0x0000000000001185) r-x 0x00001000 0x00000185 0x00000000 a.out.PT_LOAD[1]
// addr = 0x0000000000002000, section = 0x55d46ac040f0: 0xfffffffffffffffb container [0x0000000000002000-0x00000000000020cc) r-- 0x00002000 0x000000cc 0x00000000 a.out.PT_LOAD[2]
// addr = 0x0000000000003db0, section = 0x55d46ab7cef0: 0xfffffffffffffff6 container [0x0000000000003db0-0x0000000000003db4) r-- 0x00002db0 0x00000000 0x00000000 a.out.PT_TLS[0]
```
And this for the fixed LLDB:
```
// (lldb) target dump section-load-list
// addr = 0x0000000000000000, section = 0x105f0a9a8: 0xfffffffffffffffd container [0x0000000000000000-0x0000000000000628) r-- 0x00000000 0x00000628 0x00000000 a.out.PT_LOAD[0]
// addr = 0x0000000000001000, section = 0x105f0adb8: 0xfffffffffffffffc container [0x0000000000001000-0x0000000000001185) r-x 0x00001000 0x00000185 0x00000000 a.out.PT_LOAD[1]
// addr = 0x0000000000002000, section = 0x105f0af48: 0xfffffffffffffffb container [0x0000000000002000-0x00000000000020cc) r-- 0x00002000 0x000000cc 0x00000000 a.out.PT_LOAD[2]
// addr = 0x0000000000003db0, section = 0x105f0b078: 0xfffffffffffffffa container [0x0000000000003db0-0x0000000000004028) rw- 0x00002db0 0x00000274 0x00000000 a.out.PT_LOAD[3]
```
We can see that previously the "PT_LOAD[3]" segment would be removed
from the section load list, and after the fix it remains and there is on
PT_TLS in the loaded sections.
Instead of updating the member of the ObjectFileELF instance. This means
that if one object file asks another to parse the symbol table, that
first object's can update its address class map with the same changes
that the other object did.
(I'm not returning a reference to the other object's m_address_class_map
member because there may be other things in there not related to the
symbol table being parsed)
This will fix the code added in
https://github.com/llvm/llvm-project/pull/90622 which broke the test
`Expr/TestStringLiteralExpr.test` on 32 bit Arm Linux.
This happened because we had the program file, then asked for a better
object file, which returned the same program file again. This creates a
second ObjectFileELF for the same file, so when we tell the second
instance to parse the symbol table it actually calls into the first
instance, leaving the address class map of the second instance empty.
Which caused us to put an Arm breakpoint instuction at a Thumb return
address and broke the ability to call mmap.
Detects AArch64 trampolines in order to be able to step in a function
through a trampoline on AArch64.
---------
Co-authored-by: Vincent Belliard <v-bulle@github.com>
Section unification cannot just use names, because it's valid for ELF
binaries to have multiple sections with the same name. We should check
other section properties too.
Fixes#88001.
rdar://124467787
Per this RFC:
https://discourse.llvm.org/t/rfc-improve-lldb-progress-reporting/75717
on improving progress reports, this commit separates the title field and
details field so that the title specifies the category that the progress
report falls under. The details field is added as a part of the
constructor for progress reports and by default is an empty string. In addition, changes the total amount of progress completed into a std::optional. Also
updates the test to check for details being correctly reported from the
event structured data dictionary.
The implemtation support parsing kernel module for FreeBSD Kernel and
has been test on x86-64 and arm64.
In summary, this class parse the linked list resides in the kernel
memory that record all kernel module and load the debug symbol file to
facilitate debug process
In Apple's downstream fork, there is support for understanding the swift
AST sections in various binaries. Even though the lldb on llvm.org does
not have support for debugging swift, I think it makes sense to move
support for recognizing swift ast sections upstream.
Differential Revision: https://reviews.llvm.org/D159142
In Android API level 23 and above, dynamic loader is able to load .so file
directly from APK.
https://android.googlesource.com/platform/bionic/+/master/
android-changes-for-ndk-developers.md#
opening-shared-libraries-directly-from-an-apk
ObjectFileELF::GetModuleSpecifications will load a .so file, which is page
aligned and uncompressed, directly from a zip file. However it does not
set the .so file offset and size to the ModuleSpec. Also crc32 calculation
uses more data than the .so file size.
Set the .so file offset and size to the ModuleSpec, and set the size to
MapFileData length argument. For normal file, file_offset should be zero,
and length should be the size of the file.
Differential Revision: https://reviews.llvm.org/D152757
As far as I can tell, this just computes the filename of the FileSpec,
which is already conveniently stored in m_filename. We can use
FileSpec::GetFilename() instead.
Differential Revision: https://reviews.llvm.org/D149663
Allow the ObjectFileELF plugin to resolve R_ARM_ABS32 relocations from AArch32 object files. This fixes https://github.com/llvm/llvm-project/issues/61948
The existing architectures work with RELA-type relocation records that read addend from the relocation entry. REL-type relocations in AArch32 store addend in-place.
The new function doesn't re-use ELFRelocation::RelocAddend32(), because the interface doesn't match: in addition to the relocation entry we need the actual target section memory.
Reviewed By: labath
Differential Revision: https://reviews.llvm.org/D147642
These don't really need to be in ConstStrings. It's nice that comparing
ConstStrings is fast (just a pointer comparison) but the cost of
creating the ConstString usually already includes the cost of doing a
StringRef comparison anyway, so this is just extra work and extra memory
consumption for basically no benefit.
Differential Revision: https://reviews.llvm.org/D149300
ObjectFileELF::ApplyRelocations() considered all 32-bit input objects to be i386 and didn't provide good error messages for AArch32 objects. Please find an example in https://github.com/llvm/llvm-project/issues/61948
While we are here, let' improve the situation for unsupported architectures as well. I think we should report the error here too and not silently fail (or crash with assertions enabled).
Reviewed By: SixWeining
Differential Revision: https://reviews.llvm.org/D147627
This is a follow up of D145550.
I think Reloc{Type,Symbol}{32,64} can keep unchanged as they are not
directly returning a field of the ELFRel[a] struct.
Reviewed By: DavidSpickett
Differential Revision: https://reviews.llvm.org/D145571
According to `/usr/include/elf.h` and `lldb/source/Plugins/ObjectFile/ELF/ELFHeader.h`.
For ELF64 relocation, types of `offset` and `addend` should be `elf_addr` and `elf_sxword`.
Reviewed By: DavidSpickett
Differential Revision: https://reviews.llvm.org/D145550
Currently ApplyReloctions() deals with different archs' relocation types
together (in a single `switch() {..}`). I think it is incorrect because
different relocation types of different archs may have same enum values.
For example:
`R_LARCH_32` and `R_X86_64_64` are both `1`;
`R_LARCH_64` and `R_X86_64_PC32` are both `2`.
This patch handles each arch in seperate `switch()` to solve the enum
values conflict issue.
And a new test is added for LoongArch64.
Reviewed By: DavidSpickett
Differential Revision: https://reviews.llvm.org/D145462
In preparation for eanbling 64bit support in LLDB switching to use llvm::formatv
instead of format MACROs.
Reviewed By: labath, JDevlieghere
Differential Revision: https://reviews.llvm.org/D139955
This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated. The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.
This is part of an effort to migrate from llvm::Optional to
std::optional:
https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716
I encountered an issue where `p &variable` was finding an incorrect address for
32-bit PIC ELF files loaded into a running process. The problem was that the
R_386_32 ELF relocations were not being applied to the DWARF section, so all
variables in that file were reporting as being at the start of their respective
section. There is an assert that catches this on debug builds, but silently
ignores the issue on non-debug builds.
In this changeset, I added handling for the R_386_32 relocation type to
ObjectFileELF, and a supporting function to ELFRelocation to differentiate
between DT_REL & DT_RELA in ObjectFileELF::ApplyRelocations().
Demonstration of issue:
```
[dmlary@host work]$ cat rel.c
volatile char padding[32] = "make sure var isnt at .data+0";
volatile char var[] = "test";
[dmlary@host work]$ gcc -c rel.c -FPIC -fpic -g -m32
[dmlary@host work]$ lldb ./exec
(lldb) target create "./exec"
Current executable set to '/home/dmlary/src/work/exec' (i386).
(lldb) process launch --stop-at-entry
Process 21278 stopped
* thread #1, name = 'exec', stop reason = signal SIGSTOP
frame #0: 0xf7fdb150 ld-2.17.so`_start
ld-2.17.so`_start:
-> 0xf7fdb150 <+0>: movl %esp, %eax
0xf7fdb152 <+2>: calll 0xf7fdb990 ; _dl_start
ld-2.17.so`_dl_start_user:
0xf7fdb157 <+0>: movl %eax, %edi
0xf7fdb159 <+2>: calll 0xf7fdb140
Process 21278 launched: '/home/dmlary/src/work/exec' (i386)
(lldb) image add ./rel.o
(lldb) image load --file rel.o .text 0x40000000 .data 0x50000000
section '.text' loaded at 0x40000000
section '.data' loaded at 0x50000000
(lldb) image dump symtab rel.o
Symtab, file = rel.o, num_symbols = 13:
Debug symbol
|Synthetic symbol
||Externally Visible
|||
Index UserID DSX Type File Address/Value Load Address Size Flags Name
------- ------ --- --------------- ------------------ ------------------ ------------------ ---------- ----------------------------------
[ 0] 1 SourceFile 0x0000000000000000 0x0000000000000000 0x00000004 rel.c
[ 1] 2 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 2] 3 Invalid 0x0000000000000000 0x50000000 0x0000000000000020 0x00000003
[ 3] 4 Invalid 0x0000000000000025 0x0000000000000000 0x00000003
[ 4] 5 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 5] 6 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 6] 7 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 7] 8 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 8] 9 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 9] 10 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 10] 11 Invalid 0x0000000000000000 0x0000000000000020 0x00000003
[ 11] 12 X Data 0x0000000000000000 0x50000000 0x0000000000000020 0x00000011 padding
[ 12] 13 X Data 0x0000000000000020 0x50000020 0x0000000000000005 0x00000011 var
(lldb) p &var
(volatile char (*)[5]) $1 = 0x50000000
```
Reviewed By: labath
Differential Revision: https://reviews.llvm.org/D132954
Previously, depending on how you constructed a UUID from data or a
StringRef, an input value of all zeros was valid (e.g. setFromData)
or not (e.g. setFromOptionalData). Since there was no way to tell
which interpretation to use, it was done somewhat inconsistently.
This standardizes the meaning of a UUID of all zeros to Not Valid,
and removes all the Optional methods and their uses, as well as the
static factories that supported them.
Differential Revision: https://reviews.llvm.org/D132191
Symbols that have the section index of SHN_ABS were previously creating extra top level sections that contained the value of the symbol as if the symbol's value was an address. As far as I can tell, these symbol's values are not addresses, even if they do have a size. To make matters worse, adding these extra sections can stop address lookups from succeeding if the symbol's value + size overlaps with an existing section as these sections get mapped into memory when the image is loaded by the dynamic loader. This can cause stack frames to appear empty as the address lookup fails completely.
This patch:
- doesn't create a section for any SHN_ABS symbols
- makes symbols that are absolute have values that are not addresses
- add accessors to SBSymbol to get the value and size of a symbol as raw integers. Prevoiusly there was no way to access a symbol's value from a SBSymbol because the only accessors were:
SBAddress SBSymbol::GetStartAddress();
SBAddress SBSymbol::GetEndAddress();
and these accessors would return an invalid SBAddress if the symbol's value wasn't an address
- Adds a test to ensure no ".absolute.<symbol-name>" sections are created
- Adds a test to test the new SBSymbol APIs
Differential Revision: https://reviews.llvm.org/D131705
clang 14 removed -gz=zlib-gnu support and ld.lld/llvm-objcopy removed zlib-gnu
support recently. Remove lldb support by migrating away from
llvm::object::Decompressor::isCompressedELFSection.
The API has another user llvm-dwp, so it is not removed in this patch.
Reviewed By: labath
Differential Revision: https://reviews.llvm.org/D129724
It's more natural to use uint8_t * (std::byte needs C++17 and llvm has
too much uint8_t *) and most callers use uint8_t * instead of char *.
The functions are recently moved into `llvm::compression::zlib::`, so
downstream projects need to make adaption anyway.
Currently, ppc64le and ppc64 (defaulting to big endian) have the same
descriptor, thus the linear scan always return ppc64le. Handle that through
subtype.
This is a recommit of f114f00948 with a new test
setup that doesn't involves (unsupported) corefiles.
Differential Revision: https://reviews.llvm.org/D124760
This reverts commit f114f00948.
Due to hitting an assert on our lldb bots:
https://lab.llvm.org/buildbot/#/builders/96/builds/22715
../llvm-project/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp:170:
virtual lldb::RegisterContextSP ThreadElfCore::CreateRegisterContextForFrame(
lldb_private::StackFrame *): Assertion `false && "Architecture or OS not supported"' failed.
Currently, ppc64le and ppc64 (defaulting to big endian) have the same
descriptor, thus the linear scan always return ppc64le. Handle that through
subtype.
Differential Revision: https://reviews.llvm.org/D124760
Currently, all data buffers are assumed to be writable. This is a
problem on macOS where it's not allowed to load unsigned binaries in
memory as writable. To be more precise, MAP_RESILIENT_CODESIGN and
MAP_RESILIENT_MEDIA need to be set for mapped (unsigned) binaries on our
platform.
Binaries are mapped through FileSystem::CreateDataBuffer which returns a
DataBufferLLVM. The latter is backed by a llvm::WritableMemoryBuffer
because every DataBuffer in LLDB is considered to be writable. In order
to use a read-only llvm::MemoryBuffer I had to split our abstraction
around it.
This patch distinguishes between a DataBuffer (read-only) and
WritableDataBuffer (read-write) and updates LLDB to use the appropriate
one.
rdar://74890607
Differential revision: https://reviews.llvm.org/D122856
The current design allows that the object file contents could be mapped
by one object file plugin and then used by another. Presumably the idea
here was to avoid mapping the same file twice.
This becomes an issue when one object file plugin wants to map the file
differently from the others. For example, ObjectFileELF needs to map its
memory as writable while others likeObjectFileMachO needs it to be
mapped read-only.
This patch prevents plugins from changing the buffer by passing them is
by value rather than by reference.
Differential revision: https://reviews.llvm.org/D122944
