From df68f66c3244757bba4ab853e7fc89e39c3c552a Mon Sep 17 00:00:00 2001 From: Martin Liska Date: Mon, 11 Mar 2019 12:18:08 +0100 Subject: [PATCH] Backport r268789 2019-03-11 Martin Liska Backport from mainline 2019-02-11 David Malcolm PR lto/88147 * input.c (selftest::test_line_offset_overflow): New selftest. (selftest::input_c_tests): Call it. 2019-03-11 Martin Liska Backport from mainline 2019-02-11 Martin Liska PR lto/88147 * line-map.c (linemap_line_start): Don't reuse the existing line map if the line offset is sufficiently large to cause overflow when computing location_t values. From-SVN: r269576 --- gcc/ChangeLog | 9 +++++++++ gcc/input.c | 30 ++++++++++++++++++++++++++++++ libcpp/ChangeLog | 10 ++++++++++ libcpp/line-map.c | 4 ++++ 4 files changed, 53 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a60cfb6c7b22..a8bf72406216 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,12 @@ +2019-03-11 Martin Liska + + Backport from mainline + 2019-02-11 David Malcolm + + PR lto/88147 + * input.c (selftest::test_line_offset_overflow): New selftest. + (selftest::input_c_tests): Call it. + 2019-03-07 Xiong Hu Luo Backport of r268834 from mainline to gcc-7-branch. diff --git a/gcc/input.c b/gcc/input.c index 80718100d0c5..6412d70f4e26 100644 --- a/gcc/input.c +++ b/gcc/input.c @@ -3480,6 +3480,34 @@ for_each_line_table_case (void (*testcase) (const line_table_case &)) ASSERT_EQ (num_cases_tested, 2 * 12); } +/* Verify that when presented with a consecutive pair of locations with + a very large line offset, we don't attempt to consolidate them into + a single ordinary linemap where the line offsets within the line map + would lead to overflow (PR lto/88147). */ + +static void +test_line_offset_overflow () +{ + line_table_test ltt (line_table_case (5, 0)); + + linemap_add (line_table, LC_ENTER, false, "foo.c", 0); + linemap_line_start (line_table, 1, 100); + location_t loc_a = linemap_line_start (line_table, 2578, 255); + assert_loceq ("foo.c", 2578, 0, loc_a); + + const line_map_ordinary *ordmap_a = LINEMAPS_LAST_ORDINARY_MAP (line_table); + ASSERT_EQ (ordmap_a->m_column_and_range_bits, 13); + ASSERT_EQ (ordmap_a->m_range_bits, 5); + + location_t loc_b = linemap_line_start (line_table, 404198, 512); + assert_loceq ("foo.c", 404198, 0, loc_b); + + /* We should have started a new linemap, rather than attempting to store + a very large line offset. */ + const line_map_ordinary *ordmap_b = LINEMAPS_LAST_ORDINARY_MAP (line_table); + ASSERT_NE (ordmap_a, ordmap_b); +} + /* Run all of the selftests within this file. */ void @@ -3518,6 +3546,8 @@ input_c_tests () for_each_line_table_case (test_lexer_char_constants); test_reading_source_line (); + + test_line_offset_overflow (); } } // namespace selftest diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog index a320882ab0df..df7072e6fa19 100644 --- a/libcpp/ChangeLog +++ b/libcpp/ChangeLog @@ -1,3 +1,13 @@ +2019-03-11 Martin Liska + + Backport from mainline + 2019-02-11 Martin Liska + + PR lto/88147 + * line-map.c (linemap_line_start): Don't reuse the existing line + map if the line offset is sufficiently large to cause overflow + when computing location_t values. + 2018-12-06 Release Manager * GCC 7.4.0 released. diff --git a/libcpp/line-map.c b/libcpp/line-map.c index 949489eb1a1b..5827f303b6df 100644 --- a/libcpp/line-map.c +++ b/libcpp/line-map.c @@ -753,6 +753,10 @@ linemap_line_start (struct line_maps *set, linenum_type to_line, if (line_delta < 0 || last_line != ORDINARY_MAP_STARTING_LINE_NUMBER (map) || SOURCE_COLUMN (map, highest) >= (1U << (column_bits - range_bits)) + || ( /* We can't reuse the map if the line offset is sufficiently + large to cause overflow when computing location_t values. */ + (to_line - ORDINARY_MAP_STARTING_LINE_NUMBER (map)) + >= (1U << (CHAR_BIT * sizeof (linenum_type) - column_bits))) || range_bits < map->m_range_bits) map = linemap_check_ordinary (const_cast -- 2.47.2