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Generate native unwind info on Win64

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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@211399 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2014-06-20 20:35:47 +00:00
parent 20dead8d0c
commit 5b8e73ef81
19 changed files with 639 additions and 222 deletions
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24
lib/Target/X86/X86InstrCompiler.td
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@@ -110,7 +110,7 @@ let Defs = [EAX, ESP, EFLAGS], Uses = [ESP] in
// When using segmented stacks these are lowered into instructions which first
// check if the current stacklet has enough free memory. If it does, memory is
// allocated by bumping the stack pointer. Otherwise memory is allocated from
// allocated by bumping the stack pointer. Otherwise memory is allocated from
// the heap.
let Defs = [EAX, ESP, EFLAGS], Uses = [ESP] in
@@ -196,6 +196,26 @@ let isBranch = 1, isTerminator = 1, isCodeGenOnly = 1 in {
"#EH_SjLj_Setup\t$dst", []>;
}
//===----------------------------------------------------------------------===//
// Pseudo instructions used by unwind info.
//
let isPseudo = 1 in {
def SEH_PushReg : I<0, Pseudo, (outs), (ins i32imm:$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.
//
@@ -371,7 +391,7 @@ let Defs = [RCX,RDI], isCodeGenOnly = 1 in {
def REP_STOSD_64 : I<0xAB, RawFrm, (outs), (ins), "{rep;stosl|rep stosd}",
[(X86rep_stos i32)], IIC_REP_STOS>, REP, OpSize32,
Requires<[In64BitMode]>;
let Uses = [RAX,RCX,RDI] in
def REP_STOSQ_64 : RI<0xAB, RawFrm, (outs), (ins), "{rep;stosq|rep stosq}",
[(X86rep_stos i64)], IIC_REP_STOS>, REP,