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bb660fc192
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Peter Collingbourne bb660fc192 Prologue support 
Patch by Ben Gamari!

This redefines the `prefix` attribute introduced previously and
introduces a `prologue` attribute.  There are a two primary usecases
that these attributes aim to serve,

  1. Function prologue sigils

  2. Function hot-patching: Enable the user to insert `nop` operations
     at the beginning of the function which can later be safely replaced
     with a call to some instrumentation facility

  3. Runtime metadata: Allow a compiler to insert data for use by the
     runtime during execution. GHC is one example of a compiler that
     needs this functionality for its tables-next-to-code functionality.

Previously `prefix` served cases (1) and (2) quite well by allowing the user
to introduce arbitrary data at the entrypoint but before the function
body. Case (3), however, was poorly handled by this approach as it
required that prefix data was valid executable code.

Here we redefine the notion of prefix data to instead be data which
occurs immediately before the function entrypoint (i.e. the symbol
address). Since prefix data now occurs before the function entrypoint,
there is no need for the data to be valid code.

The previous notion of prefix data now goes under the name "prologue
data" to emphasize its duality with the function epilogue.

The intention here is to handle cases (1) and (2) with prologue data and
case (3) with prefix data.

References
----------

This idea arose out of discussions[1] with Reid Kleckner in response to a
proposal to introduce the notion of symbol offsets to enable handling of
case (3).

[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-May/073235.html

Test Plan: testsuite

Differential Revision: http://reviews.llvm.org/D6454

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223189 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-03 02:08:38 +00:00
..
Argument.h Provide convenient access to the zext/sext attributes of function arguments. NFC. 2014-08-05 05:43:41 +00:00
AssemblyAnnotationWriter.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Attributes.h Revert accidentally committed r217107 2014-09-03 23:38:05 +00:00
AutoUpgrade.h Rename loop unrolling and loop vectorizer metadata to have a common prefix. 2014-06-25 15:41:00 +00:00
BasicBlock.h Move helper for getting a terminating musttail call to BasicBlock 2014-08-12 00:05:15 +00:00
CallingConv.h X86: Implement the vectorcall calling convention 2014-10-28 01:29:26 +00:00
CallSite.h Add a dereferenceable attribute 2014-07-18 15:51:28 +00:00
CFG.h Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges." 2014-07-21 17:06:51 +00:00
CMakeLists.txt [CMake] intrinsics_gen: Use add_public_tablegen_target(). 2014-02-20 13:42:16 +00:00
Comdat.h IR: Add COMDATs to the IR 2014-06-27 18:19:56 +00:00
Constant.h InstCombine: sub nsw %x, C -> add nsw %x, -C if C isn't INT_MIN 2014-08-22 16:41:23 +00:00
ConstantFolder.h Add CreatePointerBitCastOrAddrSpaceCast to IRBuilder and co. 2014-07-14 17:24:35 +00:00
ConstantRange.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Constants.h Rename END_WITH_NULL to LLVM_END_WITH_NULL and move to Compiler.h 2014-11-04 01:12:21 +00:00
DataLayout.h AArch64: treat [N x Ty] as a block during procedure calls. 2014-11-27 21:02:42 +00:00
DebugInfo.h Debug Info: revert r222195, r222210 and r222239. 2014-11-21 19:55:23 +00:00
DebugLoc.h Add missing const specifier to a const method. 2014-06-05 14:32:15 +00:00
DerivedTypes.h Add params() to FunctionType. NFC. 2014-11-21 19:03:35 +00:00
DiagnosticInfo.h Update the error handling of lib/Linker. 2014-10-25 04:06:10 +00:00
DiagnosticPrinter.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
DIBuilder.h DIBuilder: Use Constant instead of Value 2014-11-15 00:23:49 +00:00
Dominators.h Move operator[] to DomTreeNodeBase 2014-07-02 06:50:48 +00:00
Function.h Prologue support 2014-12-03 02:08:38 +00:00
GetElementPtrTypeIterator.h [C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr. 2014-04-09 06:08:46 +00:00
GlobalAlias.h IR: Add COMDATs to the IR 2014-06-27 18:19:56 +00:00
GlobalObject.h Fix broken C++ mode comment 2014-11-05 01:36:22 +00:00
GlobalValue.h Modernize the error handling of the Materialize function. 2014-10-24 22:50:48 +00:00
GlobalVariable.h [pr19844] Add thread local mode to aliases. 2014-05-28 18:15:43 +00:00
GVMaterializer.h Modernize the error handling of the Materialize function. 2014-10-24 22:50:48 +00:00
InlineAsm.h Reapply r215966, r215965, r215964, r215963, r215960, r215959, r215958, and r215957 2014-08-19 16:39:58 +00:00
InstIterator.h [Modules] Move InstIterator out of the Support library, where it had no 2014-03-04 10:30:26 +00:00
InstrTypes.h Revert r220349 to re-instate r220277 with a fix for PR21330 -- quite 2014-11-25 08:20:27 +00:00
Instruction.def Add addrspacecast instruction. 2013-11-15 01:34:59 +00:00
Instruction.h Revert "IR: MDNode => Value" 2014-11-11 21:30:22 +00:00
Instructions.h Update comment on AtomicRMWInst::Nand 2014-09-22 06:47:10 +00:00
InstVisitor.h [Layering] Move InstVisitor.h into the IR library as it is pretty 2014-03-06 03:23:41 +00:00
IntrinsicInst.h Move the complex address expression out of DIVariable and into an extra 2014-10-01 18:55:02 +00:00
Intrinsics.h Revert "Masked Vector Load and Store Intrinsics." 2014-11-28 21:29:14 +00:00
Intrinsics.td [Statepoints 1/4] Statepoint infrastructure for garbage collection: IR Intrinsics 2014-12-01 21:18:12 +00:00
IntrinsicsAArch64.td Port memory barriers intrinsics to AArch64 2014-07-17 10:50:20 +00:00
IntrinsicsARM.td ARM: add @llvm.arm.space intrinsic for testing ConstantIslands. 2014-11-13 17:58:48 +00:00
IntrinsicsHexagon.td
IntrinsicsMips.td [mips][msa] Add DLSA instruction. 2014-02-10 12:05:17 +00:00
IntrinsicsNVVM.td [NVPTX] Make the alignment an explicit argument to ldu/ldg 2014-08-29 15:30:20 +00:00
IntrinsicsPowerPC.td [PowerPC] Add VSX builtins for vec_div 2014-11-14 12:10:40 +00:00
IntrinsicsR600.td R600/SI: Add missing parameter to div_fmas intrinsic 2014-10-21 22:20:55 +00:00
IntrinsicsX86.td [AVX512] Add 512b integer shift by variable intrinsics and patterns. 2014-11-25 20:41:51 +00:00
IntrinsicsXCore.td [XCore] Add intrinsic for CLRPT (clear port time) instruction. 2014-02-25 17:31:15 +00:00
IRBuilder.h Revert "Masked Vector Load and Store Intrinsics." 2014-11-28 21:29:14 +00:00
IRPrintingPasses.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
LeakDetector.h [Modules] Move the LeakDetector header into the IR library where the 2014-03-04 12:46:06 +00:00
LegacyPassManager.h [C++11] Add 'override' keyword to IR library. 2014-03-05 06:35:38 +00:00
LegacyPassManagers.h FunctionPassManager isn't used by the JIT anymore, it is used in 2014-09-10 10:48:06 +00:00
LegacyPassNameParser.h Do not register and de-register PassRegistrationListeners during 2014-06-12 00:16:36 +00:00
LLVMContext.h Introduce enum values for previously defined metadata types. (NFC) 2014-10-21 00:13:20 +00:00
Mangler.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
MDBuilder.h Simplify and improve scoped-noalias metadata semantics 2014-07-25 15:50:02 +00:00
Metadata.h IR: Sink MDNode::Hash down to GenericMDNode::Hash 2014-11-18 02:20:29 +00:00
Module.h Transform: add SymbolRewriter pass 2014-11-07 21:32:08 +00:00
NoFolder.h [Modules] Move the NoFolder into the IR library as it creates 2014-03-04 12:05:47 +00:00
OperandTraits.h
Operator.h InstCombine: Don't assume that m_ZExt matches an Instruction 2014-11-01 23:46:05 +00:00
PassManager.h Use range based for loops to avoid needing to re-mention SmallPtrSet size. 2014-08-24 23:23:06 +00:00
PatternMatch.h Unbreak the build. 2014-10-25 18:20:17 +00:00
PredIteratorCache.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Statepoint.h Restructure some assertion checking based on post commit feedback by Aaron and Tom. 2014-12-02 21:01:48 +00:00
SymbolTableListTraits.h [C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr. 2014-04-09 06:08:46 +00:00
Type.h Add and use Type::subtypes. NFC. 2014-11-24 20:44:36 +00:00
TypeBuilder.h #include <climits> instead of <limits.h> in C++ header file. 2013-06-13 23:49:09 +00:00
TypeFinder.h
Use.h Updated the link to the correct URL. 2014-04-29 13:21:05 +00:00
UseListOrder.h verify-uselistorder: Force -preserve-bc-use-list-order 2014-08-19 21:08:27 +00:00
User.h IR: Move NumOperands from User to Value, NFC 2014-10-15 20:39:05 +00:00
Value.h [InstCombine] Re-commit of r218721 (Optimize icmp-select-icmp sequence) 2014-11-21 23:36:44 +00:00
ValueHandle.h IR: Cleanup comments for Value, User, and MDNode 2014-10-15 20:28:31 +00:00
ValueMap.h Support: add llvm::unique_lock 2014-08-23 23:07:14 +00:00
ValueSymbolTable.h
Verifier.h verify-di: Implement DebugInfoVerifier 2014-04-15 16:27:38 +00:00