[AMDGPU] Emit debugger prologue and emit the rest of the debugger fields in the kernel code header

Debugger prologue is emitted if -mattr=+amdgpu-debugger-emit-prologue.

Debugger prologue writes work group IDs and work item IDs to scratch memory at fixed location in the following format:
  - offset 0: work group ID x
  - offset 4: work group ID y
  - offset 8: work group ID z
  - offset 16: work item ID x
  - offset 20: work item ID y
  - offset 24: work item ID z

Set
  - amd_kernel_code_t::debug_wavefront_private_segment_offset_sgpr to scratch wave offset reg
  - amd_kernel_code_t::debug_private_segment_buffer_sgpr to scratch rsrc reg
  - amd_kernel_code_t::is_debug_supported to true if all debugger features are enabled

Differential Revision: http://reviews.llvm.org/D20335

llvm-svn: 273769

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.h b/llvm/lib/Target/AMDGPU/SIISelLowering.h
index 032372b7b17..3806e95dff3 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.h
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.h
@@ -70,6 +70,8 @@ class SITargetLowering final : public AMDGPUTargetLowering {
   bool isLegalMUBUFAddressingMode(const AddrMode &AM) const;
 
   bool isCFIntrinsic(const SDNode *Intr) const;
+
+  void createDebuggerPrologueStackObjects(MachineFunction &MF) const;
 public:
   SITargetLowering(const TargetMachine &tm, const SISubtarget &STI);