From 5754a61e57efaa9bec8ad8ea8589a73b27edb0a8 Mon Sep 17 00:00:00 2001 From: Pavel Labath Date: Thu, 27 Feb 2020 16:22:12 +0100 Subject: [PATCH] [DataExtractor] Improve error message when we run off the end of the buffer Summary: Include the offset at which this happened. Reviewers: dblaikie, jhenderson Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75265 --- llvm/lib/Support/DataExtractor.cpp | 11 ++++++----- .../DebugInfo/X86/dwarfdump-debug-loc-error-cases2.s | 4 ++-- .../X86/dwarfdump-debug-loclists-error-cases2.s | 4 ++-- .../DebugInfo/DWARF/DWARFDataExtractorTest.cpp | 17 ++++++++++------- llvm/unittests/DebugInfo/DWARF/DWARFDieTest.cpp | 6 +++--- 5 files changed, 23 insertions(+), 19 deletions(-) diff --git a/llvm/lib/Support/DataExtractor.cpp b/llvm/lib/Support/DataExtractor.cpp index 3d19b4d..d6fd9a5 100644 --- a/llvm/lib/Support/DataExtractor.cpp +++ b/llvm/lib/Support/DataExtractor.cpp @@ -15,10 +15,11 @@ using namespace llvm; -static void unexpectedEndReached(Error *E) { +static void unexpectedEndReached(Error *E, uint64_t Offset) { if (E) *E = createStringError(errc::illegal_byte_sequence, - "unexpected end of data"); + "unexpected end of data at offset 0x%" PRIx64, + Offset); } static bool isError(Error *E) { return E && *E; } @@ -33,7 +34,7 @@ static T getU(uint64_t *offset_ptr, const DataExtractor *de, uint64_t offset = *offset_ptr; if (!de->isValidOffsetForDataOfSize(offset, sizeof(T))) { - unexpectedEndReached(Err); + unexpectedEndReached(Err, offset); return val; } std::memcpy(&val, &Data[offset], sizeof(val)); @@ -56,7 +57,7 @@ static T *getUs(uint64_t *offset_ptr, T *dst, uint32_t count, uint64_t offset = *offset_ptr; if (!de->isValidOffsetForDataOfSize(offset, sizeof(*dst) * count)) { - unexpectedEndReached(Err); + unexpectedEndReached(Err, offset); return nullptr; } for (T *value_ptr = dst, *end = dst + count; value_ptr != end; @@ -229,5 +230,5 @@ void DataExtractor::skip(Cursor &C, uint64_t Length) const { if (isValidOffsetForDataOfSize(C.Offset, Length)) C.Offset += Length; else - unexpectedEndReached(&C.Err); + unexpectedEndReached(&C.Err, C.Offset); } diff --git a/llvm/test/DebugInfo/X86/dwarfdump-debug-loc-error-cases2.s b/llvm/test/DebugInfo/X86/dwarfdump-debug-loc-error-cases2.s index f15deb5..7e951e5 100644 --- a/llvm/test/DebugInfo/X86/dwarfdump-debug-loc-error-cases2.s +++ b/llvm/test/DebugInfo/X86/dwarfdump-debug-loc-error-cases2.s @@ -8,11 +8,11 @@ # CHECK: DW_AT_name ("x1") # CHECK-NEXT: DW_AT_location (0xdeadbeef -# CHECK-NEXT: error: unexpected end of data) +# CHECK-NEXT: error: unexpected end of data at offset 0xdeadbeef) # CHECK: DW_AT_name ("x2") # CHECK-NEXT: DW_AT_location (0x00000036 -# CHECK-NEXT: error: unexpected end of data) +# CHECK-NEXT: error: unexpected end of data at offset 0x48) .type f,@function diff --git a/llvm/test/DebugInfo/X86/dwarfdump-debug-loclists-error-cases2.s b/llvm/test/DebugInfo/X86/dwarfdump-debug-loclists-error-cases2.s index 48ae8d4..7a0c42c 100644 --- a/llvm/test/DebugInfo/X86/dwarfdump-debug-loclists-error-cases2.s +++ b/llvm/test/DebugInfo/X86/dwarfdump-debug-loclists-error-cases2.s @@ -8,11 +8,11 @@ # CHECK: DW_AT_name ("x1") # CHECK-NEXT: DW_AT_location (0xdeadbeef -# CHECK-NEXT: error: unexpected end of data) +# CHECK-NEXT: error: unexpected end of data at offset 0xdeadbeef) # CHECK: DW_AT_name ("x2") # CHECK-NEXT: DW_AT_location (0x00000025 -# CHECK-NEXT: error: unexpected end of data) +# CHECK-NEXT: error: unexpected end of data at offset 0x34) .type f,@function diff --git a/llvm/unittests/DebugInfo/DWARF/DWARFDataExtractorTest.cpp b/llvm/unittests/DebugInfo/DWARF/DWARFDataExtractorTest.cpp index 589ae3f..6528cd0 100644 --- a/llvm/unittests/DebugInfo/DWARF/DWARFDataExtractorTest.cpp +++ b/llvm/unittests/DebugInfo/DWARF/DWARFDataExtractorTest.cpp @@ -41,13 +41,15 @@ TEST(DWARFDataExtractorTest, getInitialLength) { auto ErrorResult = std::make_tuple(0, dwarf::DWARF32, 0); // Empty data. - EXPECT_THAT_EXPECTED(GetWithError({}), - FailedWithMessage("unexpected end of data")); + EXPECT_THAT_EXPECTED( + GetWithError({}), + FailedWithMessage("unexpected end of data at offset 0x0")); EXPECT_EQ(GetWithoutError({}), ErrorResult); // Not long enough for the U32 field. - EXPECT_THAT_EXPECTED(GetWithError({0x00, 0x01, 0x02}), - FailedWithMessage("unexpected end of data")); + EXPECT_THAT_EXPECTED( + GetWithError({0x00, 0x01, 0x02}), + FailedWithMessage("unexpected end of data at offset 0x0")); EXPECT_EQ(GetWithoutError({0x00, 0x01, 0x02}), ErrorResult); EXPECT_THAT_EXPECTED( @@ -72,14 +74,15 @@ TEST(DWARFDataExtractorTest, getInitialLength) { EXPECT_EQ(GetWithoutError({0xff, 0xff, 0xff, 0xf0}), ErrorResult); // DWARF64 marker without the subsequent length field. - EXPECT_THAT_EXPECTED(GetWithError({0xff, 0xff, 0xff, 0xff}), - FailedWithMessage("unexpected end of data")); + EXPECT_THAT_EXPECTED( + GetWithError({0xff, 0xff, 0xff, 0xff}), + FailedWithMessage("unexpected end of data at offset 0x4")); EXPECT_EQ(GetWithoutError({0xff, 0xff, 0xff, 0xff}), ErrorResult); // Not enough data for the U64 length. EXPECT_THAT_EXPECTED( GetWithError({0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03}), - FailedWithMessage("unexpected end of data")); + FailedWithMessage("unexpected end of data at offset 0x4")); EXPECT_EQ(GetWithoutError({0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03}), ErrorResult); diff --git a/llvm/unittests/DebugInfo/DWARF/DWARFDieTest.cpp b/llvm/unittests/DebugInfo/DWARF/DWARFDieTest.cpp index 5312492..b662965 100644 --- a/llvm/unittests/DebugInfo/DWARF/DWARFDieTest.cpp +++ b/llvm/unittests/DebugInfo/DWARF/DWARFDieTest.cpp @@ -105,9 +105,9 @@ TEST(DWARFDie, getLocations) { &ErrorInfoBase::message, "Unable to resolve indirect address 1 for: DW_LLE_startx_length"))); - EXPECT_THAT_EXPECTED(Die.getLocations(DW_AT_call_data_location), - Failed(testing::Property( - &ErrorInfoBase::message, "unexpected end of data"))); + EXPECT_THAT_EXPECTED( + Die.getLocations(DW_AT_call_data_location), + FailedWithMessage("unexpected end of data at offset 0x20")); EXPECT_THAT_EXPECTED( Die.getLocations(DW_AT_call_data_value), -- 2.7.4