Re-apply r211399, "Generate native unwind info on Win64" with a fix to ignore SEH pseudo ops in X86 JIT emitter.

--
This patch enables LLVM to emit Win64-native unwind info rather than
DWARF CFI.  It handles all corner cases (I hope), including stack
realignment.

Because the unwind info is not flexible enough to describe stack frames
with a gap of unknown size in the middle, such as the one caused by
stack realignment, I modified register spilling code to place all spills
into the fixed frame slots, so that they can be accessed relative to the
frame pointer.

Patch by Vadim Chugunov!

Reviewed By: rnk

Differential Revision: http://reviews.llvm.org/D4081

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211691 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/Target/X86/X86InstrCompiler.td b/lib/Target/X86/X86InstrCompiler.td
index 496a9cb761..77a876df02 100644
--- a/lib/Target/X86/X86InstrCompiler.td
+++ b/lib/Target/X86/X86InstrCompiler.td
@@ -197,6 +197,26 @@ let isBranch = 1, isTerminator = 1, isCodeGenOnly = 1 in {
 }
 
 //===----------------------------------------------------------------------===//
+// Pseudo instructions used by unwind info.
+//
+let isPseudo = 1 in {
+  def SEH_PushReg : I<0, Pseudo, (outs), (ins i32imm:$reg),
+                            "#SEH_PushReg $reg", []>;
+  def SEH_SaveReg : I<0, Pseudo, (outs), (ins i32imm:$reg, i32imm:$dst),
+                            "#SEH_SaveReg $reg, $dst", []>;
+  def SEH_SaveXMM : I<0, Pseudo, (outs), (ins i32imm:$reg, i32imm:$dst),
+                            "#SEH_SaveXMM $reg, $dst", []>;
+  def SEH_StackAlloc : I<0, Pseudo, (outs), (ins i32imm:$size),
+                            "#SEH_StackAlloc $size", []>;
+  def SEH_SetFrame : I<0, Pseudo, (outs), (ins i32imm:$reg, i32imm:$offset),
+                            "#SEH_SetFrame $reg, $offset", []>;
+  def SEH_PushFrame : I<0, Pseudo, (outs), (ins i1imm:$mode),
+                            "#SEH_PushFrame $mode", []>;
+  def SEH_EndPrologue : I<0, Pseudo, (outs), (ins),
+                            "#SEH_EndPrologue", []>;
+}
+
+//===----------------------------------------------------------------------===//
 // Pseudo instructions used by segmented stacks.
 //