AArch64: add block comments where missing

Only comments affected. No code change at all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175169 91177308-0d34-0410-b5e6-96231b3b80d8

19 files changed, 86 insertions, 11 deletions

diff --git a/lib/Target/AArch64/AArch64.td b/lib/Target/AArch64/AArch64.td
index 0e4f5fb1c5..e17052b4a5 100644
--- a/lib/Target/AArch64/AArch64.td
+++ b/lib/Target/AArch64/AArch64.td
@@ -6,7 +6,9 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
 // This is the top level entry point for the AArch64 target.
+//
 //===----------------------------------------------------------------------===//
 
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/AArch64/AArch64AsmPrinter.h b/lib/Target/AArch64/AArch64AsmPrinter.h
index 492be66fbd..b6f9ee6ebe 100644
--- a/lib/Target/AArch64/AArch64AsmPrinter.h
+++ b/lib/Target/AArch64/AArch64AsmPrinter.h
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// AArch64 Assembly printer class.
+// This file defines the AArch64 assembly printer class.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Target/AArch64/AArch64FrameLowering.h b/lib/Target/AArch64/AArch64FrameLowering.h
index a14c2bb791..bca7b06921 100644
--- a/lib/Target/AArch64/AArch64FrameLowering.h
+++ b/lib/Target/AArch64/AArch64FrameLowering.h
@@ -7,7 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//
+// This class implements the AArch64-specific parts of the TargetFrameLowering
+// class.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Target/AArch64/AArch64InstrFormats.td b/lib/Target/AArch64/AArch64InstrFormats.td
index c6aa265638..8cb770ea7f 100644
--- a/lib/Target/AArch64/AArch64InstrFormats.td
+++ b/lib/Target/AArch64/AArch64InstrFormats.td
@@ -6,11 +6,14 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+// This file describes AArch64 instruction formats, down to the level of the
+// instruction's overall class.
+// ===----------------------------------------------------------------------===//
+
 
 //===----------------------------------------------------------------------===//
-//
 // A64 Instruction Format Definitions.
-//
+//===----------------------------------------------------------------------===//
 
 // A64 is currently the only instruction set supported by the AArch64
 // architecture.
diff --git a/lib/Target/AArch64/AArch64InstrInfo.td b/lib/Target/AArch64/AArch64InstrInfo.td
index adcab89e72..d514364e1b 100644
--- a/lib/Target/AArch64/AArch64InstrInfo.td
+++ b/lib/Target/AArch64/AArch64InstrInfo.td
@@ -1,3 +1,16 @@
+//===----- AArch64InstrInfo.td - AArch64 Instruction Info ----*- tablegen -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes the AArch64 scalar instructions in TableGen format.
+//
+//===----------------------------------------------------------------------===//
+
 include "AArch64InstrFormats.td"
 
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/AArch64/AArch64MachineFunctionInfo.cpp b/lib/Target/AArch64/AArch64MachineFunctionInfo.cpp
index 012a4f8a68..f45d8f784f 100644
--- a/lib/Target/AArch64/AArch64MachineFunctionInfo.cpp
+++ b/lib/Target/AArch64/AArch64MachineFunctionInfo.cpp
@@ -6,7 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-
+//
+// This file just contains the anchor for the AArch64MachineFunctionInfo to
+// force vtable emission.
+//
+//===----------------------------------------------------------------------===//
 #include "AArch64MachineFunctionInfo.h"
 
 using namespace llvm;
diff --git a/lib/Target/AArch64/AArch64RegisterInfo.h b/lib/Target/AArch64/AArch64RegisterInfo.h
index 3be083d5f6..a25f9d2bdc 100644
--- a/lib/Target/AArch64/AArch64RegisterInfo.h
+++ b/lib/Target/AArch64/AArch64RegisterInfo.h
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file contains the AArch64 implementation of the MRegisterInfo class.
+// This file contains the AArch64 implementation of the MCRegisterInfo class.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Target/AArch64/AArch64RegisterInfo.td b/lib/Target/AArch64/AArch64RegisterInfo.td
index 3cbbf1405c..bd79546371 100644
--- a/lib/Target/AArch64/AArch64RegisterInfo.td
+++ b/lib/Target/AArch64/AArch64RegisterInfo.td
@@ -1,4 +1,4 @@
-//===- ARMRegisterInfo.td - ARM Register defs --------------*- tablegen -*-===//
+//===- AArch64RegisterInfo.td - ARM Register defs ----------*- tablegen -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,9 +6,9 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-
-//===----------------------------------------------------------------------===//
-//  Declarations that describe the ARM register file
+//
+//  This file contains declarations that describe the AArch64 register file
+//
 //===----------------------------------------------------------------------===//
 
 let Namespace = "AArch64" in {
diff --git a/lib/Target/AArch64/AArch64TargetMachine.cpp b/lib/Target/AArch64/AArch64TargetMachine.cpp
index 68e3643d8e..5a18338d2a 100644
--- a/lib/Target/AArch64/AArch64TargetMachine.cpp
+++ b/lib/Target/AArch64/AArch64TargetMachine.cpp
@@ -7,6 +7,9 @@
 //
 //===----------------------------------------------------------------------===//
 //
+// This file contains the implementation of the AArch64TargetMachine
+// methods. Principally just setting up the passes needed to generate correct
+// code on this architecture.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Target/AArch64/AArch64TargetObjectFile.cpp b/lib/Target/AArch64/AArch64TargetObjectFile.cpp
index d5c3e89c95..b4452f5145 100644
--- a/lib/Target/AArch64/AArch64TargetObjectFile.cpp
+++ b/lib/Target/AArch64/AArch64TargetObjectFile.cpp
@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file deals with any AArch64 specific requirements on object files.
+//
+//===----------------------------------------------------------------------===//
+
 
 #include "AArch64TargetObjectFile.h"
 
diff --git a/lib/Target/AArch64/AArch64TargetObjectFile.h b/lib/Target/AArch64/AArch64TargetObjectFile.h
index 07caac1d93..bf0565a79e 100644
--- a/lib/Target/AArch64/AArch64TargetObjectFile.h
+++ b/lib/Target/AArch64/AArch64TargetObjectFile.h
@@ -6,6 +6,10 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file deals with any AArch64 specific requirements on object files.
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef LLVM_TARGET_AARCH64_TARGETOBJECTFILE_H
 #define LLVM_TARGET_AARCH64_TARGETOBJECTFILE_H
diff --git a/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
index 1cdeafb4dc..f871ecf67e 100644
--- a/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file contains the (GNU-style) assembly parser for the AArch64
+// architecture.
+//
+//===----------------------------------------------------------------------===//
 
 
 #include "MCTargetDesc/AArch64MCTargetDesc.h"
diff --git a/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp b/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
index 38d0e8edde..eba76667e2 100644
--- a/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
+++ b/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
@@ -1,4 +1,4 @@
-//===- AArch64Disassembler.cpp - Disassembler for AArch64/Thumb ISA -------===//
+//===- AArch64Disassembler.cpp - Disassembler for AArch64 ISA -------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,6 +6,12 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file contains the functions necessary to decode AArch64 instruction
+// bitpatterns into MCInsts (with the help of TableGenerated information from
+// the instruction definitions).
+//
+//===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "arm-disassembler"
 
diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp b/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
index 5d5e38e6f7..a3373b1087 100644
--- a/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
+++ b/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file contains the AArch64 implementation of the MCAsmBackend class,
+// which is principally concerned with relaxation of the various fixup kinds.
+//
+//===----------------------------------------------------------------------===//
 
 #include "MCTargetDesc/AArch64FixupKinds.h"
 #include "MCTargetDesc/AArch64MCTargetDesc.h"
diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp b/lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp
index 476b94e70f..4bcc65dfca 100644
--- a/lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp
+++ b/lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp
@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file handles ELF-specific object emission, converting LLVM's internal
+// fixups into the appropriate relocations.
+//
+//===----------------------------------------------------------------------===//
 
 #include "MCTargetDesc/AArch64FixupKinds.h"
 #include "MCTargetDesc/AArch64MCTargetDesc.h"
diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64FixupKinds.h b/lib/Target/AArch64/MCTargetDesc/AArch64FixupKinds.h
index 15e088667c..eeb122d384 100644
--- a/lib/Target/AArch64/MCTargetDesc/AArch64FixupKinds.h
+++ b/lib/Target/AArch64/MCTargetDesc/AArch64FixupKinds.h
@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file describes the LLVM fixups applied to MCInsts in the AArch64
+// backend.
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef LLVM_AARCH64_AARCH64FIXUPKINDS_H
 #define LLVM_AARCH64_AARCH64FIXUPKINDS_H
diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.cpp b/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.cpp
index e86e04aa33..c1abfe74df 100644
--- a/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.cpp
+++ b/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.cpp
@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file contains the implementation of the assembly expression modifiers
+// accepted by the AArch64 architecture (e.g. ":lo12:", ":gottprel_g1:", ...).
+//
+//===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "aarch64mcexpr"
 #include "AArch64MCExpr.h"
diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h b/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h
index f2af2049b6..c0e3b29474 100644
--- a/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h
+++ b/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h
@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file describes AArch64-specific MCExprs, used for modifiers like
+// ":lo12:" or ":gottprel_g1:".
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef LLVM_AARCH64MCEXPR_H
 #define LLVM_AARCH64MCEXPR_H
diff --git a/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp b/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
index 5dbdc57d0e..b8099cb26b 100644
--- a/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
+++ b/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
@@ -6,6 +6,10 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file contains the key registration step for the architecture.
+//
+//===----------------------------------------------------------------------===//
 
 #include "AArch64.h"
 #include "llvm/IR/Module.h"