forked from OSchip/llvm-project
PR21189: Teach llvm-readobj to dump bits of COFF symbol subsections required to debug using VS2012+
Reviewed at http://reviews.llvm.org/D5755 Thanks to Andrey Guskov for his help investigating this! llvm-svn: 220526
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@ -662,9 +662,14 @@ namespace COFF {
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enum CodeViewLineTableIdentifiers {
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DEBUG_SECTION_MAGIC = 0x4,
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DEBUG_SYMBOL_SUBSECTION = 0xF1,
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DEBUG_LINE_TABLE_SUBSECTION = 0xF2,
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DEBUG_STRING_TABLE_SUBSECTION = 0xF3,
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DEBUG_INDEX_SUBSECTION = 0xF4
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DEBUG_INDEX_SUBSECTION = 0xF4,
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// Symbol subsections are split into records of different types.
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DEBUG_SYMBOL_TYPE_PROC_START = 0x1147,
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DEBUG_SYMBOL_TYPE_PROC_END = 0x114F
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};
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inline bool isReservedSectionNumber(int32_t SectionNumber) {
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@ -40,6 +40,12 @@ MFUN32: ]
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MFUN32-NEXT: Subsection [
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MFUN32-NEXT: Type: 0xF1
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MFUN32-NEXT: PayloadSize: 0x4B
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MFUN32: ProcStart {
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MFUN32-NEXT: FunctionName: x
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MFUN32-NEXT: Section: _x
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MFUN32-NEXT: CodeSize: 0xA
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MFUN32-NEXT: }
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MFUN32-NEXT: ProcEnd
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MFUN32: ]
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MFUN32-NEXT: Subsection [
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MFUN32-NEXT: Type: 0xF2
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@ -53,6 +59,12 @@ MFUN32: ]
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MFUN32-NEXT: Subsection [
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MFUN32-NEXT: Type: 0xF1
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MFUN32-NEXT: PayloadSize: 0x4B
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MFUN32: ProcStart {
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MFUN32-NEXT: FunctionName: y
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MFUN32-NEXT: Section: _y
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MFUN32-NEXT: CodeSize: 0xA
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MFUN32-NEXT: }
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MFUN32-NEXT: ProcEnd
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MFUN32: ]
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MFUN32-NEXT: Subsection [
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MFUN32-NEXT: Type: 0xF2
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@ -66,6 +78,12 @@ MFUN32: ]
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MFUN32-NEXT: Subsection [
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MFUN32-NEXT: Type: 0xF1
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MFUN32-NEXT: PayloadSize: 0x4B
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MFUN32: ProcStart {
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MFUN32-NEXT: FunctionName: f
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MFUN32-NEXT: Section: _f
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MFUN32-NEXT: CodeSize: 0x14
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MFUN32-NEXT: }
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MFUN32-NEXT: ProcEnd
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MFUN32: ]
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MFUN32-NEXT: Subsection [
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MFUN32-NEXT: Type: 0xF2
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@ -127,6 +145,12 @@ MFUN64: ]
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MFUN64-NEXT: Subsection [
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MFUN64-NEXT: Type: 0xF1
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MFUN64-NEXT: PayloadSize: 0x4B
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MFUN64: ProcStart {
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MFUN64-NEXT: FunctionName: x
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MFUN64-NEXT: Section: x
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MFUN64-NEXT: CodeSize: 0xE
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MFUN64-NEXT: }
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MFUN64-NEXT: ProcEnd
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MFUN64: ]
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MFUN64-NEXT: Subsection [
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MFUN64-NEXT: Type: 0xF2
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@ -136,6 +160,12 @@ MFUN64-NEXT: ]
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MFUN64-NEXT: Subsection [
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MFUN64-NEXT: Type: 0xF1
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MFUN64-NEXT: PayloadSize: 0x4B
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MFUN64: ProcStart {
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MFUN64-NEXT: FunctionName: y
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MFUN64-NEXT: Section: y
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MFUN64-NEXT: CodeSize: 0xE
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MFUN64-NEXT: }
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MFUN64-NEXT: ProcEnd
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MFUN64: ]
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MFUN64-NEXT: Subsection [
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MFUN64-NEXT: Type: 0xF2
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@ -145,6 +175,12 @@ MFUN64-NEXT: ]
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MFUN64-NEXT: Subsection [
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MFUN64-NEXT: Type: 0xF1
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MFUN64-NEXT: PayloadSize: 0x4B
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MFUN64: ProcStart {
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MFUN64-NEXT: FunctionName: f
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MFUN64-NEXT: Section: f
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MFUN64-NEXT: CodeSize: 0x18
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MFUN64-NEXT: }
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MFUN64-NEXT: ProcEnd
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MFUN64: ]
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MFUN64-NEXT: Subsection [
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MFUN64-NEXT: Type: 0xF2
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@ -234,6 +270,12 @@ MFILE32: ]
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MFILE32-NEXT: Subsection [
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MFILE32-NEXT: Type: 0xF1
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MFILE32-NEXT: PayloadSize: 0x4B
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MFILE32: ProcStart {
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MFILE32-NEXT: FunctionName: f
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MFILE32-NEXT: Section: _f
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MFILE32-NEXT: CodeSize: 0x14
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MFILE32-NEXT: }
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MFILE32-NEXT: ProcEnd
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MFILE32: ]
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MFILE32-NEXT: Subsection [
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MFILE32-NEXT: Type: 0xF2
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@ -284,6 +326,12 @@ MFILE64: ]
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MFILE64-NEXT: Subsection [
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MFILE64-NEXT: Type: 0xF1
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MFILE64-NEXT: PayloadSize: 0x4B
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MFILE64: ProcStart {
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MFILE64-NEXT: FunctionName: f
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MFILE64-NEXT: Section: f
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MFILE64-NEXT: CodeSize: 0x18
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MFILE64-NEXT: }
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MFILE64-NEXT: ProcEnd
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MFILE64: ]
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MFILE64-NEXT: Subsection [
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MFILE64-NEXT: Type: 0xF2
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@ -344,23 +392,33 @@ RUN: | FileCheck %s -check-prefix MCOMDAT
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RUN: llvm-readobj -s -codeview-linetables %p/Inputs/comdat-function-linetables.obj.coff-2013-i386 \
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RUN: | FileCheck %s -check-prefix MCOMDAT
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MCOMDAT: ProcStart {
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MCOMDAT-NEXT: FunctionName: f
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MCOMDAT-NEXT: Section: ?f@@YAHXZ
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MCOMDAT-NEXT: CodeSize: 0x7
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MCOMDAT-NEXT: }
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MCOMDAT: FunctionLineTable [
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MCOMDAT-NEXT: FunctionName: ?f@@YAHXZ
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MCOMDAT-NEXT: CodeSize: 0x7
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MCOMDAT-NEXT: FilenameSegment [
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MCOMDAT-NEXT: Filename: c:\src\test.cc
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MCOMDAT-NEXT: +0x0: 2
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MCOMDAT-NEXT: +0x3: 3
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MCOMDAT-NEXT: +0x5: 4
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MCOMDAT-NEXT: ]
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MCOMDAT-NEXT: ]
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MCOMDAT-NEXT: FunctionName: ?f@@YAHXZ
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MCOMDAT-NEXT: CodeSize: 0x7
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MCOMDAT-NEXT: FilenameSegment [
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MCOMDAT-NEXT: Filename: c:\src\test.cc
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MCOMDAT-NEXT: +0x0: 2
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MCOMDAT-NEXT: +0x3: 3
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MCOMDAT-NEXT: +0x5: 4
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MCOMDAT-NEXT: ]
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MCOMDAT-NEXT: ]
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MCOMDAT: ProcStart {
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MCOMDAT-NEXT: FunctionName: g
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MCOMDAT-NEXT: Section: ?g@@YAHXZ
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MCOMDAT-NEXT: CodeSize: 0x7
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MCOMDAT-NEXT: }
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MCOMDAT: FunctionLineTable [
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MCOMDAT-NEXT: FunctionName: ?g@@YAHXZ
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MCOMDAT-NEXT: CodeSize: 0x7
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MCOMDAT-NEXT: FilenameSegment [
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MCOMDAT-NEXT: Filename: c:\src\test.cc
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MCOMDAT-NEXT: +0x0: 7
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MCOMDAT-NEXT: +0x3: 8
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MCOMDAT-NEXT: +0x5: 9
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MCOMDAT-NEXT: ]
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MCOMDAT-NEXT: ]
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MCOMDAT-NEXT: FunctionName: ?g@@YAHXZ
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MCOMDAT-NEXT: CodeSize: 0x7
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MCOMDAT-NEXT: FilenameSegment [
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MCOMDAT-NEXT: Filename: c:\src\test.cc
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MCOMDAT-NEXT: +0x0: 7
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MCOMDAT-NEXT: +0x3: 8
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MCOMDAT-NEXT: +0x5: 9
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MCOMDAT-NEXT: ]
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MCOMDAT-NEXT: ]
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@ -69,6 +69,10 @@ private:
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void printCodeViewLineTables(const SectionRef &Section);
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void printCodeViewSymbolsSubsection(StringRef Subsection,
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const SectionRef &Section,
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uint32_t Offset);
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void cacheRelocations();
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std::error_code resolveSymbol(const coff_section *Section, uint64_t Offset,
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@ -444,6 +448,7 @@ void COFFDumper::printCodeViewLineTables(const SectionRef &Section) {
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ListScope D(W, "CodeViewLineTables");
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{
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// FIXME: Add more offset correctness checks.
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DataExtractor DE(Data, true, 4);
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uint32_t Offset = 0,
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Magic = DE.getU32(&Offset);
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@ -473,6 +478,9 @@ void COFFDumper::printCodeViewLineTables(const SectionRef &Section) {
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W.printBinaryBlock("Contents", Contents);
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switch (SubSectionType) {
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case COFF::DEBUG_SYMBOL_SUBSECTION:
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printCodeViewSymbolsSubsection(Contents, Section, Offset);
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break;
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case COFF::DEBUG_LINE_TABLE_SUBSECTION: {
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// Holds a PC to file:line table. Some data to parse this subsection is
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// stored in the other subsections, so just check sanity and store the
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@ -592,6 +600,80 @@ void COFFDumper::printCodeViewLineTables(const SectionRef &Section) {
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}
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}
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void COFFDumper::printCodeViewSymbolsSubsection(StringRef Subsection,
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const SectionRef &Section,
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uint32_t OffsetInSection) {
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if (Subsection.size() == 0) {
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error(object_error::parse_failed);
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return;
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}
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DataExtractor DE(Subsection, true, 4);
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uint32_t Offset = 0;
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// Function-level subsections have "procedure start" and "procedure end"
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// commands that should come in pairs and surround relevant info.
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bool InFunctionScope = false;
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while (DE.isValidOffset(Offset)) {
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// Read subsection segments one by one.
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uint16_t Size = DE.getU16(&Offset);
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// The section size includes the size of the type identifier.
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if (Size < 2 || !DE.isValidOffsetForDataOfSize(Offset, Size)) {
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error(object_error::parse_failed);
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return;
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}
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Size -= 2;
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uint16_t Type = DE.getU16(&Offset);
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switch (Type) {
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case COFF::DEBUG_SYMBOL_TYPE_PROC_START: {
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DictScope S(W, "ProcStart");
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if (InFunctionScope || Size < 36) {
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error(object_error::parse_failed);
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return;
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}
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InFunctionScope = true;
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// We're currently interested in a limited subset of fields in this
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// segment, just ignore the rest of the fields for now.
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uint8_t Unused[12];
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DE.getU8(&Offset, Unused, 12);
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uint32_t CodeSize = DE.getU32(&Offset);
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DE.getU8(&Offset, Unused, 12);
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StringRef SectionName;
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if (error(resolveSymbolName(Obj->getCOFFSection(Section),
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OffsetInSection + Offset, SectionName)))
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return;
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Offset += 4;
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DE.getU8(&Offset, Unused, 3);
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StringRef FunctionName = DE.getCStr(&Offset);
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if (!DE.isValidOffset(Offset)) {
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error(object_error::parse_failed);
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return;
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}
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W.printString("FunctionName", FunctionName);
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W.printString("Section", SectionName);
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W.printHex("CodeSize", CodeSize);
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break;
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}
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case COFF::DEBUG_SYMBOL_TYPE_PROC_END: {
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W.startLine() << "ProcEnd\n";
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if (!InFunctionScope || Size > 0) {
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error(object_error::parse_failed);
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return;
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}
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InFunctionScope = false;
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break;
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}
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default:
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Offset += Size;
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break;
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}
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}
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if (InFunctionScope)
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error(object_error::parse_failed);
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}
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void COFFDumper::printSections() {
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ListScope SectionsD(W, "Sections");
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int SectionNumber = 0;
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