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[CodeGen] Introduce a FAULTING_LOAD_OP pseudo-op.

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Summary:
This instruction encodes a loading operation that may fault, and a label
to branch to if the load page-faults.  The locations of potentially
faulting loads and their "handler" destinations are recorded in a
FaultMap section, meant to be consumed by LLVM's clients.

Nothing generates FAULTING_LOAD_OP instructions yet, but they will be
used in a future change.

The documentation (FaultMaps.rst) needs improvement and I will update
this diff with a more expanded version shortly.

Depends on D10196

Reviewers: rnk, reames, AndyAyers, ab, atrick, pgavlin

Reviewed By: atrick, pgavlin

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10197

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239740 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjoy Das
2015-06-15 18:44:08 +00:00
parent 36395e7598
commit 1991e2a4df
12 changed files with 299 additions and 3 deletions
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6
lib/MC/MCObjectFileInfo.cpp
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@@ -238,6 +238,9 @@ void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) {
StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
0, SectionKind::getMetadata());
FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
0, SectionKind::getMetadata());
TLSExtraDataSection = TLSTLVSection;
}
@@ -518,6 +521,9 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
StackMapSection =
Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
FaultMapSection =
Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
}
void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {