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Prakhar Bahuguna dc9a43dec1 [ARM] Implement execute-only support in CodeGen

This implements execute-only support for ARM code generation, which
prevents the compiler from generating data accesses to code sections.
The following changes are involved:

* Add the CodeGen option "-arm-execute-only" to the ARM code generator.
* Add the clang flag "-mexecute-only" as well as the GCC-compatible
  alias "-mpure-code" to enable this option.
* When enabled, literal pools are replaced with MOVW/MOVT instructions,
  with VMOV used in addition for floating-point literals. As the MOVT
  instruction is required, execute-only support is only available in
  Thumb mode for targets supporting ARMv8-M baseline or Thumb2.
* Jump tables are placed in data sections when in execute-only mode.
* The execute-only text section is assigned section ID 0, and is
  marked as unreadable with the SHF_ARM_PURECODE flag with symbol 'y'.
  This also overrides selection of ELF sections for globals.

llvm-svn: 289784

2016-12-15 07:59:08 +00:00

AArch64

[Assembler] Better error messages for .org directive

2016-12-14 10:43:58 +00:00

AMDGPU

AMDGPU: Fix handling of 16-bit immediates

2016-12-10 00:39:12 +00:00

ARM

[Assembler] Better error messages for .org directive

2016-12-14 10:43:58 +00:00

AsmParser

[Assembler] Better error messages for .org directive