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author | Reid Kleckner <reid@kleckner.net> | 2014-06-20 20:35:47 +0000 |
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committer | Reid Kleckner <reid@kleckner.net> | 2014-06-20 20:35:47 +0000 |
commit | 5b8e73ef81bdbc3ce4d020f66d875e22827b7626 (patch) | |
tree | 81e26866c3184143e4adec8bd26d003dc644245b /lib/MC | |
parent | 20dead8d0ce64f70e1dcf558f69b6d725ba18d9d (diff) | |
download | llvm-5b8e73ef81bdbc3ce4d020f66d875e22827b7626.tar.gz llvm-5b8e73ef81bdbc3ce4d020f66d875e22827b7626.tar.bz2 llvm-5b8e73ef81bdbc3ce4d020f66d875e22827b7626.tar.xz |
Generate native unwind info on Win64
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
Diffstat (limited to 'lib/MC')
-rw-r--r-- | lib/MC/MCObjectFileInfo.cpp | 15 | ||||
-rw-r--r-- | lib/MC/MCStreamer.cpp | 2 |
2 files changed, 12 insertions, 5 deletions
diff --git a/lib/MC/MCObjectFileInfo.cpp b/lib/MC/MCObjectFileInfo.cpp index d12f60c099..4df9221d6c 100644 --- a/lib/MC/MCObjectFileInfo.cpp +++ b/lib/MC/MCObjectFileInfo.cpp @@ -632,11 +632,16 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { // though it contains relocatable pointers. In PIC mode, this is probably a // big runtime hit for C++ apps. Either the contents of the LSDA need to be // adjusted or this should be a data section. - LSDASection = - Ctx->getCOFFSection(".gcc_except_table", - COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | - COFF::IMAGE_SCN_MEM_READ, - SectionKind::getReadOnly()); + assert(T.isOSWindows() && "Windows is the only supported COFF target"); + if (T.getArch() == Triple::x86_64) { + // On Windows 64 with SEH, the LSDA is emitted into the .xdata section + LSDASection = 0; + } else { + LSDASection = Ctx->getCOFFSection(".gcc_except_table", + COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | + COFF::IMAGE_SCN_MEM_READ, + SectionKind::getReadOnly()); + } // Debug info. COFFDebugSymbolsSection = diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp index 7dccf0d751..2a6097a7b4 100644 --- a/lib/MC/MCStreamer.cpp +++ b/lib/MC/MCStreamer.cpp @@ -526,6 +526,8 @@ void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) { report_fatal_error("Frame register and offset already specified!"); if (Offset & 0x0F) report_fatal_error("Misaligned frame pointer offset!"); + if (Offset > 240) + report_fatal_error("Frame offset must be less than or equal to 240!"); MCSymbol *Label = getContext().CreateTempSymbol(); MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset); EmitLabel(Label); |