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* Create a MCSymbolELF.Rafael Espindola2015-06-021-9/+16
| | | | | | | | | This create a MCSymbolELF class and moves SymbolSize since only ELF needs a size expression. This reduces the size of MCSymbol from 56 to 48 bytes. llvm-svn: 238801
* [MC] Simplify code. No functionality change intended.Benjamin Kramer2015-05-311-7/+2
| | | | llvm-svn: 238676
* Move MCSection destruction to MCContext::reset.Rafael Espindola2015-05-261-8/+8
| | | | | | | | Fixes the leaks when running llc. Also found by an asan bot. llvm-svn: 238167
* Call the destructors of the MCSections.Rafael Espindola2015-05-261-0/+8
| | | | | | | | | They now contain the fragments. If we don't call the destructors the fragments leak. Found by an asan bot. llvm-svn: 238161
* MC: Shave a pointer off of MCSymbol::NameDuncan P. N. Exon Smith2015-05-221-4/+3
| | | | | | | | | | | | | Shave a pointer off of `MCSymbolName` by storing `StringMapEntry<bool>*` instead of `StringRef`. This brings `sizeof(MCSymbol)` down to 64 on 64-bit platforms, a nice round number. My profile showed memory dropping from 914 MB down to 908 MB, roughly 0.7%. Other than memory usage, no functionality change here. (I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`; see r236629 for details.) llvm-svn: 238005
* Move alignment from MCSectionData to MCSection.Rafael Espindola2015-05-211-35/+35
| | | | | | | | | | | | | | | | | | | | | | | | This starts merging MCSection and MCSectionData. There are a few issues with the current split between MCSection and MCSectionData. * It optimizes the the not as important case. We want the production of .o files to be really fast, but the split puts the information used for .o emission in a separate data structure. * The ELF/COFF/MachO hierarchy is not represented in MCSectionData, leading to some ad-hoc ways to represent the various flags. * It makes it harder to remember where each item is. The attached patch starts merging the two by moving the alignment from MCSectionData to MCSection. Most of the patch is actually just dropping 'const', since MCSectionData is mutable, but MCSection was not. llvm-svn: 237936
* Avoid unnecessary section switching. NFC.Rafael Espindola2015-05-211-2/+1
| | | | llvm-svn: 237913
* Remove yet another method of creating begin and end symbol for sections.Rafael Espindola2015-05-211-19/+9
| | | | | | I missed this one when first unifying how we handle begin and end symbols. llvm-svn: 237912
* [WinEH] Store pointers to the LSDA in the exception registration objectReid Kleckner2015-05-201-0/+5
| | | | | | | We aren't yet emitting the LSDA yet, so this will still fail to assemble. llvm-svn: 237852
* MC: clang-format MCContext. NFC.Jim Grosbach2015-05-181-8/+9
| | | | llvm-svn: 237595
* MC: Clean up method names in MCContext.Jim Grosbach2015-05-181-15/+15
| | | | | | | The naming was a mish-mash of old and new style. Update to be consistent with the new. NFC. llvm-svn: 237594
* MC: Skip names of temporary symbols in object streamerDuncan P. N. Exon Smith2015-05-061-0/+3
| | | | | | | | | | | | | | Don't create names for temporary symbols when using an object streamer. The names never make it to the output anyway. From the starting point of r236629, my heap profile says this drops peak memory usage from 1100 MB to 1058 MB for CodeGen of `verify-uselistorder`, a savings of almost 4% on peak memory, and removes `StringMap<bool, BumpPtrAllocator...>` from the profile entirely. (I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`; see r236629 for details.) llvm-svn: 236642
* Remove the GroupMapTy DenseMap. NFC.Rafael Espindola2015-04-281-2/+2
| | | | | | Instead use the Group symbol of MCSectionELF. llvm-svn: 236033
* Revert accidentally committed "MC: Allow targets to stop symbol name quoting"Matt Arsenault2015-04-231-4/+2
| | | | llvm-svn: 235672
* MC: Allow targets to stop symbol name quotingMatt Arsenault2015-04-231-2/+4
| | | | | | | | | Currently symbol names are printed in quotes if it contains something outside of the arbitrary set of characters that isAcceptableChar tests for. On somem targets, it is never OK to print a symbol name in quotes so allow targets to opt out of this behavior. llvm-svn: 235670
* Store the sh_link of ARM_EXIDX directly in MCSectionELF.Rafael Espindola2015-04-061-4/+15
| | | | | | This avoids some pretty horrible and broken name based section handling. llvm-svn: 234142
* Simplify mapping from relocation sections to relocated sections.Rafael Espindola2015-04-061-5/+7
| | | | | | | | Just store the section in MCSectionELF. This avoids multiple hash lookups. This will also be used by ARM_EXIDX. llvm-svn: 234139
* Don't mix overload and default values.Rafael Espindola2015-04-041-14/+0
| | | | | | It makes it hard to see which one is being called. llvm-svn: 234100
* Implement unique sections with an unique ID.Rafael Espindola2015-04-041-11/+13
| | | | | | | | | | | This allows the compiler/assembly programmer to switch back to a section. This in turn fixes the bootstrap failure on powerpc (tested on gcc110) without changing the ppc codegen at all. I will try to cleanup the various getELFSection overloads in a followup patch. Just using a default argument now would lead to ambiguities. llvm-svn: 234099
* [WinEH] Generate .xdata for catch handlersDavid Majnemer2015-03-311-0/+5
| | | | | | | | | | | | | | This lets us catch exceptions in simple cases. N.B. Things that do not work include (but are not limited to): - Throwing from within a catch handler. - Catching an object with a named catch parameter. - 'CatchHigh' is fictitious, we aren't sure of its purpose. - We aren't entirely efficient with regards to the number of EH states that we generate. - IP-to-State tables are sensitive to the order of emission. llvm-svn: 233767
* Save a std::string.Rafael Espindola2015-03-301-9/+12
| | | | | | The group names are always symbol names, so we can use a StringRef. llvm-svn: 233545
* Special case the creation of relocation sections.Rafael Espindola2015-03-301-0/+12
| | | | | | | | | | | These sections are never looked up and we know when have to create them. Use that to save adding them to the regular map and avoid a symbol->string->symbol conversion for the group symbol. This also makes the implementation independent of the details of how unique sections are implemented. llvm-svn: 233539
* Add two small structs for readability in place of std::pair and std::tuple. NFC.Rafael Espindola2015-03-271-10/+9
| | | | llvm-svn: 233422
* Centralize the handling of unique ids for temporary labels.Rafael Espindola2015-03-171-32/+31
| | | | | | | | | | | | | | | | Before this patch code wanting to create temporary labels for a given entity (function, cu, exception range, etc) had to keep its own counter to have stable symbol names. createTempSymbol would still add a suffix to make sure a new symbol was always returned, but it kept a single counter. Because of that, if we were to use just createTempSymbol("cu_begin"), the label could change from cu_begin42 to cu_begin43 because some other code started using temporary labels. Simplify this by just keeping one counter per prefix and removing the various specialized counters. llvm-svn: 232535
* Remove LookupSymbol(StringRef) and optimize LookupSymbol(Twine).Yaron Keren2015-03-171-7/+3
| | | | | | | | Same as MakeArgString in r232465, keep only LookupSymbol(Twine) while making sure it handles the StringRef like cases efficiently using twine::toStringRef. llvm-svn: 232517
* Teach Twine to support SmallString.Yaron Keren2015-03-171-9/+6
| | | | | | | | Enable removing .str() member calls for these frequent cases. http://reviews.llvm.org/D6372 llvm-svn: 232465
* Create symbols marking the start of a section earlier.Rafael Espindola2015-03-101-25/+40
| | | | | | | | | This lets us pass the symbol to the constructor and avoid the mutable field. This also opens the way for outputting the symbol only when needed, instead of outputting them at the start of the file. llvm-svn: 231859
* clang-format code that is about to change.Rafael Espindola2015-03-101-8/+10
| | | | llvm-svn: 231848
* Replace llvm.frameallocate with llvm.frameescapeReid Kleckner2015-03-051-3/+4
| | | | | | | | | | Turns out it's pretty straightforward and simplifies the implementation. Reviewers: andrew.w.kaylor Differential Revision: http://reviews.llvm.org/D8051 llvm-svn: 231386
* Remove MCStreamer.h include from MCContext.h and explictly include it where ↵Pete Cooper2015-03-041-0/+1
| | | | | | necessary. NFC llvm-svn: 231193
* Centralize handling of the eh_begin and eh_end labels.Rafael Espindola2015-02-271-0/+6
| | | | | | | | | | This removes a bit of duplicated code and more importantly, remembers the labels so that they don't need to be looked up by name. This in turn allows for any name to be used and avoids a crash if the name we wanted was already taken. llvm-svn: 230772
* Add r228980 back.Rafael Espindola2015-02-171-6/+14
| | | | | | | | | | Add support for having multiple sections with the same name and comdat. Using this in combination with -ffunction-sections allows LLVM to output a .o file with mulitple sections named .text. This saves space by avoiding long unique names of the form .text.<C++ mangled name>. llvm-svn: 229541
* Revert a series of commits starting at r228886 which is triggering someChandler Carruth2015-02-131-14/+6
| | | | | | | | | | | | | | | | regressions for LLDB on Linux. Rafael indicated on lldb-dev that we should just go ahead and revert these but that he wasn't at a computer. The patches backed out are as follows: r228980: Add support for having multiple sections with the name and ... r228889: Invert the section relocation map. r228888: Use the existing SymbolTableIndex intsead of doing a lookup. r228886: Create the Section -> Rel Section map when it is first needed. These patches look pretty nice to me, so hoping its not too hard to get them re-instated. =D llvm-svn: 229080
* Add support for having multiple sections with the same name and comdat.Rafael Espindola2015-02-121-6/+14
| | | | | | | | Using this in combination with -ffunction-sections allows LLVM to output a .o file with mulitple sections named .text. This saves space by avoiding long unique names of the form .text.<C++ mangled name>. llvm-svn: 228980
* Compute the ELF SectionKind from the flags.Rafael Espindola2015-01-291-12/+13
| | | | | | | | | | | | Any code creating an MCSectionELF knows ELF and already provides the flags. SectionKind is an abstraction used by common code that uses a plain MCSection. Use the flags to compute the SectionKind. This removes a lot of guessing and boilerplate from the MCSectionELF construction. llvm-svn: 227476
* Add the llvm.frameallocate and llvm.recoverframeallocation intrinsicsReid Kleckner2015-01-131-0/+5
| | | | | | | | | | | | | | | | | | | | | These intrinsics allow multiple functions to share a single stack allocation from one function's call frame. The function with the allocation may only perform one allocation, and it must be in the entry block. Functions accessing the allocation call llvm.recoverframeallocation with the function whose frame they are accessing and a frame pointer from an active call frame of that function. These intrinsics are very difficult to inline correctly, so the intention is that they be introduced rarely, or at least very late during EH preparation. Reviewers: echristo, andrew.w.kaylor Differential Revision: http://reviews.llvm.org/D6493 llvm-svn: 225746
* Remove StringMap::GetOrCreateValue in favor of StringMap::insertDavid Blaikie2014-11-191-21/+14
| | | | | | | | | | | | | | Having two ways to do this doesn't seem terribly helpful and consistently using the insert version (which we already has) seems like it'll make the code easier to understand to anyone working with standard data structures. (I also updated many references to the Entry's key and value to use first() and second instead of getKey{Data,Length,} and get/setValue - for similar consistency) Also removes the GetOrCreateValue functions so there's less surface area to StringMap to fix/improve/change/accommodate move semantics, etc. llvm-svn: 222319
* Add back commits r219835 and a fixed version of r219829.Rafael Espindola2014-10-171-0/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The only difference from r219829 is using getOrCreateSectionSymbol(*ELFSec) instead of GetOrCreateSymbol(ELFSec->getSectionName()) in ELFObjectWriter which causes us to use the correct section symbol even if we have multiple sections with the same name. Original messages: r219829: Correctly handle references to section symbols. When processing assembly like .long .text we were creating a new undefined symbol .text. GAS on the other hand would handle that as a reference to the .text section. This patch implements that by creating the section symbols earlier so that they are visible during asm parsing. The patch also updates llvm-readobj to print the symbol number in the relocation dump so that the test can differentiate between two sections with the same name. r219835: Allow forward references to section symbols. llvm-svn: 220021
* Revert commit r219835 and r219829.Rafael Espindola2014-10-171-24/+0
| | | | | | | | | Revert "Correctly handle references to section symbols." Revert "Allow forward references to section symbols." Rui found a regression I am debugging. llvm-svn: 220010
* Allow forward references to section symbols.Rafael Espindola2014-10-151-1/+8
| | | | llvm-svn: 219835
* Correctly handle references to section symbols.Rafael Espindola2014-10-151-0/+17
| | | | | | | | | | | | | | | | | When processing assembly like .long .text we were creating a new undefined symbol .text. GAS on the other hand would handle that as a reference to the .text section. This patch implements that by creating the section symbols earlier so that they are visible during asm parsing. The patch also updates llvm-readobj to print the symbol number in the relocation dump so that the test can differentiate between two sections with the same name. llvm-svn: 219829
* Add and update reset() and doInitialization() methods to MC* and passes.Yaron Keren2014-09-171-0/+3
| | | | | | This enables reusing a PassManager instead of re-constructing it every time. llvm-svn: 217948
* MC Win64: Put unwind info for COMDAT code into the same COMDAT groupReid Kleckner2014-09-041-0/+16
| | | | | | | | | | | | | | | | | Summary: This fixes a long standing issue where we would emit many little .text sections and only one .pdata and .xdata section. Now we generate one .pdata / .xdata pair per .text section and associate them correctly. Fixes PR19667. Reviewers: majnemer Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D5181 llvm-svn: 217176
* CodeGen: Stick constant pool entries in COMDAT sections for WinCOFFDavid Majnemer2014-07-141-1/+1
| | | | | | | | | | | | | | | | COFF lacks a feature that other object file formats support: mergeable sections. To work around this, MSVC sticks constant pool entries in special COMDAT sections so that each constant is in it's own section. This permits unused constants to be dropped and it also allows duplicate constants in different translation units to get merged together. This fixes PR20262. Differential Revision: http://reviews.llvm.org/D4482 llvm-svn: 213006
* SourceMgr: make valid buffer IDs start from oneAlp Toker2014-07-061-2/+3
| | | | | | | | | | Use 0 for the invalid buffer instead of -1/~0 and switch to unsigned representation to enable more idiomatic usage. Also introduce a trivial SourceMgr::getMainFileID() instead of hard-coding 0/1 to identify the main file. llvm-svn: 212398
* MC: Fix associative sections on COFFDavid Majnemer2014-06-271-5/+5
| | | | | | | | | COFF sections in MC were represented by a tuple of section-name and COMDAT-name. This is not sufficient to represent a .text section associated with another .text section; we need a way to distinguish between the key section and the one marked associative. llvm-svn: 211913
* Revert "Introduce a string_ostream string builder facilty"Alp Toker2014-06-261-6/+8
| | | | | | Temporarily back out commits r211749, r211752 and r211754. llvm-svn: 211814
* Introduce a string_ostream string builder faciltyAlp Toker2014-06-261-8/+6
| | | | | | | | | | | | | | | | | | | | string_ostream is a safe and efficient string builder that combines opaque stack storage with a built-in ostream interface. small_string_ostream<bytes> additionally permits an explicit stack storage size other than the default 128 bytes to be provided. Beyond that, storage is transferred to the heap. This convenient class can be used in most places an std::string+raw_string_ostream pair or SmallString<>+raw_svector_ostream pair would previously have been used, in order to guarantee consistent access without byte truncation. The patch also converts much of LLVM to use the new facility. These changes include several probable bug fixes for truncated output, a programming error that's no longer possible with the new interface. llvm-svn: 211749
* Emit DWARF info for all code section in an assembly fileOliver Stannard2014-06-191-0/+23
| | | | | | | | Currently, when using llvm as an assembler, DWARF debug information is only generated for the .text section. This patch modifies this so that DWARF info is emitted for all executable sections. llvm-svn: 211273
* Remove 'using std::errro_code' from lib.Rafael Espindola2014-06-131-2/+1
| | | | llvm-svn: 210871
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