From ce20d460e2a96c05ff8a2d5a6d57d6a6ef5a1cfa Mon Sep 17 00:00:00 2001 From: Manman Ren Date: Tue, 29 Oct 2013 22:57:10 +0000 Subject: Debug Info: support for DW_FORM_ref_addr. To support ref_addr, we calculate the section offset of a DIE (i.e. offset of a DIE from beginning of the debug info section). The Offset field in DIE is currently CU-relative. To calculate the section offset, we add a DebugInfoOffset field in CompileUnit to store the offset of a CU from beginning of the debug info section. We set the value in DwarfUnits::computeSizeAndOffset for each CompileUnit. A helper function DIE::getCompileUnit is added to return the CU DIE that the input DIE belongs to. We also add a map CUDieMap in DwarfDebug to help finding the CU for a given CU DIE. For a cross-referenced DIE, we first find the CU DIE it belongs to with getCompileUnit, then we use CUDieMap to get the corresponding CU for the CU DIE. Adding the section offset of the CU with the CU-relative offset of a DIE gives us the seciton offset of the DIE. We correctly emit ref_addr with relocation using EmitLabelPlusOffset when doesDwarfUseRelocationsAcrossSections is true. This commit handles the emission of DW_FORM_ref_addr when we have an attribute with FORM_ref_addr. A follow-on patch will start using ref_addr when adding a DIEEntry. This commit will be tested and verified in the follow-on patch. Reviewed off-list by Eric, Thanks. llvm-svn: 193658 --- llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h') diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h index 83ea0cc967a..d3ce12c67a9 100644 --- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h +++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h @@ -329,6 +329,9 @@ class DwarfDebug { // Maps subprogram MDNode with its corresponding CompileUnit. DenseMap SPMap; + // Maps a CU DIE with its corresponding CompileUnit. + DenseMap CUDieMap; + // Used to uniquely define abbreviations. FoldingSet AbbreviationsSet; -- cgit v1.2.3