From 4a01230db47e979146cf5784ca78bd7d6f802ac3 Mon Sep 17 00:00:00 2001 From: Reid Kleckner Date: Fri, 20 Jun 2014 20:35:47 +0000 Subject: 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 llvm-svn: 211399 --- llvm/lib/MC/MCObjectFileInfo.cpp | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) (limited to 'llvm/lib/MC/MCObjectFileInfo.cpp') diff --git a/llvm/lib/MC/MCObjectFileInfo.cpp b/llvm/lib/MC/MCObjectFileInfo.cpp index d12f60c0992..4df9221d6c4 100644 --- a/llvm/lib/MC/MCObjectFileInfo.cpp +++ b/llvm/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 = -- cgit v1.2.3