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Add support for dwarf5 line tables.

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Change-Id: I2c0cd0e7163502e52fbf0745b611befb2e219071
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2276193
Reviewed-by: Sterling Augustine <saugustine@google.com>
This commit is contained in:
Sterling Augustine 2020-06-30 13:59:15 -07:00
parent b6f36dd775
commit a741027533
10 changed files with 509 additions and 64 deletions
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36
src/common/dwarf/dwarf2reader.h
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@ -98,8 +98,10 @@ class LineInfo {
// to the beginning and length of the line information to read.
// Reader is a ByteReader class that has the endianness set
// properly.
LineInfo(const uint8_t *buffer_, uint64_t buffer_length,
ByteReader* reader, LineInfoHandler* handler);
LineInfo(const uint8_t* buffer, uint64_t buffer_length,
ByteReader* reader, const uint8_t* string_buffer,
size_t string_buffer_length, const uint8_t* line_string_buffer,
size_t line_string_buffer_length, LineInfoHandler* handler);
virtual ~LineInfo() {
if (header_.std_opcode_lengths) {
@ -137,15 +139,32 @@ class LineInfo {
// Reads the DWARF2/3 line information
void ReadLines();
// Read the DWARF5 types and forms for the file and directory tables.
void ReadTypesAndForms(const uint8_t** lineptr, uint32_t* content_types,
uint32_t* content_forms, uint32_t max_types,
uint32_t* format_count);
// Read a row from the dwarf5 LineInfo file table.
void ReadFileRow(const uint8_t** lineptr, const uint32_t* content_types,
const uint32_t* content_forms, uint32_t row,
uint32_t format_count);
// Read and return the data at *lineptr according to form. Advance
// *lineptr appropriately.
uint64_t ReadUnsignedData(uint32_t form, const uint8_t** lineptr);
// Read and return the data at *lineptr according to form. Advance
// *lineptr appropriately.
const char* ReadStringForm(uint32_t form, const uint8_t** lineptr);
// The associated handler to call processing functions in
LineInfoHandler* handler_;
// The associated ByteReader that handles endianness issues for us
ByteReader* reader_;
// A DWARF2/3 line info header. This is not the same size as
// in the actual file, as the one in the file may have a 32 bit or
// 64 bit lengths
// A DWARF line info header. This is not the same size as in the actual file,
// as the one in the file may have a 32 bit or 64 bit lengths
struct LineInfoHeader header_;
@ -156,6 +175,13 @@ class LineInfo {
#ifndef NDEBUG
uint64_t buffer_length_;
#endif
// Convenience pointers into .debug_str and .debug_line_str. These exactly
// correspond to those in the compilation unit.
const uint8_t* string_buffer_;
uint64_t string_buffer_length_;
const uint8_t* line_string_buffer_;
uint64_t line_string_buffer_length_;
const uint8_t *after_header_;
};