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diagnostic-show-locus.c
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/* Diagnostic subroutines for printing source-code
Copyright (C) 1999-2020 Free Software Foundation, Inc.
Contributed by Gabriel Dos Reis <[email protected]>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "version.h"
#include "demangle.h"
#include "intl.h"
#include "backtrace.h"
#include "diagnostic.h"
#include "diagnostic-color.h"
#include "gcc-rich-location.h"
#include "selftest.h"
#include "selftest-diagnostic.h"
#include "cpplib.h"
#ifdef HAVE_TERMIOS_H
# include <termios.h>
#endif
#ifdef GWINSZ_IN_SYS_IOCTL
# include <sys/ioctl.h>
#endif
/* Disable warnings about quoting issues in the pp_xxx calls below
that (intentionally) don't follow GCC diagnostic conventions. */
#if __GNUC__ >= 10
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wformat-diag"
#endif
/* Classes for rendering source code and diagnostics, within an
anonymous namespace.
The work is done by "class layout", which embeds and uses
"class colorizer" and "class layout_range" to get things done. */
namespace {
/* The state at a given point of the source code, assuming that we're
in a range: which range are we in, and whether we should draw a caret at
this point. */
struct point_state
{
int range_idx;
bool draw_caret_p;
};
/* A class to inject colorization codes when printing the diagnostic locus.
It has one kind of colorization for each of:
- normal text
- range 0 (the "primary location")
- range 1
- range 2
The class caches the lookup of the color codes for the above.
The class also has responsibility for tracking which of the above is
active, filtering out unnecessary changes. This allows
layout::print_source_line and layout::print_annotation_line
to simply request a colorization code for *every* character they print,
via this class, and have the filtering be done for them here. */
class colorizer
{
public:
colorizer (diagnostic_context *context,
diagnostic_t diagnostic_kind);
~colorizer ();
void set_range (int range_idx)
{
/* Normally we emphasize the primary location, then alternate between
two colors for the secondary locations.
But if we're printing a run of events in a diagnostic path, that
makes no sense, so print all of them with the same colorization. */
if (m_diagnostic_kind == DK_DIAGNOSTIC_PATH)
set_state (0);
else
set_state (range_idx);
}
void set_normal_text () { set_state (STATE_NORMAL_TEXT); }
void set_fixit_insert () { set_state (STATE_FIXIT_INSERT); }
void set_fixit_delete () { set_state (STATE_FIXIT_DELETE); }
private:
void set_state (int state);
void begin_state (int state);
void finish_state (int state);
const char *get_color_by_name (const char *);
private:
static const int STATE_NORMAL_TEXT = -1;
static const int STATE_FIXIT_INSERT = -2;
static const int STATE_FIXIT_DELETE = -3;
diagnostic_context *m_context;
diagnostic_t m_diagnostic_kind;
int m_current_state;
const char *m_range1;
const char *m_range2;
const char *m_fixit_insert;
const char *m_fixit_delete;
const char *m_stop_color;
};
/* In order to handle multibyte sources properly, all of this logic needs to be
aware of the distinction between the number of bytes and the number of
display columns occupied by a character, which are not the same for non-ASCII
characters. For example, the Unicode pi symbol, U+03C0, is encoded in UTF-8
as "\xcf\x80", and thus occupies 2 bytes of space while only occupying 1
display column when it is output. A typical emoji, such as U+1F602 (in
UTF-8, "\xf0\x9f\x98\x82"), requires 4 bytes and has a display width of 2.
The below example line, which is also used for selftests below, shows how the
display column and byte column are related:
0000000001111111111222222 display
1234567890123456789012345 columns
SS_foo = P_bar.SS_fieldP;
0000000111111111222222223 byte
1356789012456789134567891 columns
Here SS represents the two display columns for the U+1F602 emoji, and P
represents the one display column for the U+03C0 pi symbol. As an example, a
diagnostic pointing to the final P on this line is at byte column 29 and
display column 24. This reflects the fact that the three extended characters
before the final P occupy cumulatively 5 more bytes than they do display
columns (a difference of 2 for each of the two SSs, and one for the other P).
One or the other of the two column units is more useful depending on the
context. For instance, in order to output the caret at the correct location,
we need to count display columns; in order to colorize a source line, we need
to count the bytes. All locations are provided to us as byte counts, which
we augment with the display column on demand so that it can be used when
needed. This is not the most efficient way to do things since it requires
looping over the whole line each time, but it should be fine for the purpose
of outputting diagnostics.
In order to keep straight which units (byte or display) are in use at a
given time, the following enum lets us specify that explicitly. */
enum column_unit {
/* Measured in raw bytes. */
CU_BYTES = 0,
/* Measured in display units. */
CU_DISPLAY_COLS,
/* For arrays indexed by column_unit. */
CU_NUM_UNITS
};
/* Utility class to augment an exploc with the corresponding display column. */
class exploc_with_display_col : public expanded_location
{
public:
exploc_with_display_col (const expanded_location &exploc)
: expanded_location (exploc),
m_display_col (location_compute_display_column (exploc)) {}
int m_display_col;
};
/* A point within a layout_range; similar to an exploc_with_display_col,
but after filtering on file. */
class layout_point
{
public:
layout_point (const expanded_location &exploc)
: m_line (exploc.line)
{
m_columns[CU_BYTES] = exploc.column;
m_columns[CU_DISPLAY_COLS] = location_compute_display_column (exploc);
}
linenum_type m_line;
int m_columns[CU_NUM_UNITS];
};
/* A class for use by "class layout" below: a filtered location_range. */
class layout_range
{
public:
layout_range (const expanded_location *start_exploc,
const expanded_location *finish_exploc,
enum range_display_kind range_display_kind,
const expanded_location *caret_exploc,
unsigned original_idx,
const range_label *label);
bool contains_point (linenum_type row, int column,
enum column_unit col_unit) const;
bool intersects_line_p (linenum_type row) const;
layout_point m_start;
layout_point m_finish;
enum range_display_kind m_range_display_kind;
layout_point m_caret;
unsigned m_original_idx;
const range_label *m_label;
};
/* A struct for use by layout::print_source_line for telling
layout::print_annotation_line the extents of the source line that
it printed, so that underlines can be clipped appropriately. */
struct line_bounds
{
int m_first_non_ws;
int m_last_non_ws;
void convert_to_display_cols (char_span line)
{
m_first_non_ws = cpp_byte_column_to_display_column (line.get_buffer (),
line.length (),
m_first_non_ws);
m_last_non_ws = cpp_byte_column_to_display_column (line.get_buffer (),
line.length (),
m_last_non_ws);
}
};
/* A range of contiguous source lines within a layout (e.g. "lines 5-10"
or "line 23"). During the layout ctor, layout::calculate_line_spans
splits the pertinent source lines into a list of disjoint line_span
instances (e.g. lines 5-10, lines 15-20, line 23). */
class line_span
{
public:
line_span (linenum_type first_line, linenum_type last_line)
: m_first_line (first_line), m_last_line (last_line)
{
gcc_assert (first_line <= last_line);
}
linenum_type get_first_line () const { return m_first_line; }
linenum_type get_last_line () const { return m_last_line; }
bool contains_line_p (linenum_type line) const
{
return line >= m_first_line && line <= m_last_line;
}
static int comparator (const void *p1, const void *p2)
{
const line_span *ls1 = (const line_span *)p1;
const line_span *ls2 = (const line_span *)p2;
int first_line_cmp = compare (ls1->m_first_line, ls2->m_first_line);
if (first_line_cmp)
return first_line_cmp;
return compare (ls1->m_last_line, ls2->m_last_line);
}
linenum_type m_first_line;
linenum_type m_last_line;
};
#if CHECKING_P
/* Selftests for line_span. */
static void
test_line_span ()
{
line_span line_one (1, 1);
ASSERT_EQ (1, line_one.get_first_line ());
ASSERT_EQ (1, line_one.get_last_line ());
ASSERT_FALSE (line_one.contains_line_p (0));
ASSERT_TRUE (line_one.contains_line_p (1));
ASSERT_FALSE (line_one.contains_line_p (2));
line_span lines_1_to_3 (1, 3);
ASSERT_EQ (1, lines_1_to_3.get_first_line ());
ASSERT_EQ (3, lines_1_to_3.get_last_line ());
ASSERT_TRUE (lines_1_to_3.contains_line_p (1));
ASSERT_TRUE (lines_1_to_3.contains_line_p (3));
ASSERT_EQ (0, line_span::comparator (&line_one, &line_one));
ASSERT_GT (line_span::comparator (&lines_1_to_3, &line_one), 0);
ASSERT_LT (line_span::comparator (&line_one, &lines_1_to_3), 0);
/* A linenum > 2^31. */
const linenum_type LARGEST_LINE = 0xffffffff;
line_span largest_line (LARGEST_LINE, LARGEST_LINE);
ASSERT_EQ (LARGEST_LINE, largest_line.get_first_line ());
ASSERT_EQ (LARGEST_LINE, largest_line.get_last_line ());
ASSERT_GT (line_span::comparator (&largest_line, &line_one), 0);
ASSERT_LT (line_span::comparator (&line_one, &largest_line), 0);
}
#endif /* #if CHECKING_P */
/* A class to control the overall layout when printing a diagnostic.
The layout is determined within the constructor.
It is then printed by repeatedly calling the "print_source_line",
"print_annotation_line" and "print_any_fixits" methods.
We assume we have disjoint ranges. */
class layout
{
public:
layout (diagnostic_context *context,
rich_location *richloc,
diagnostic_t diagnostic_kind);
bool maybe_add_location_range (const location_range *loc_range,
unsigned original_idx,
bool restrict_to_current_line_spans);
int get_num_line_spans () const { return m_line_spans.length (); }
const line_span *get_line_span (int idx) const { return &m_line_spans[idx]; }
int get_linenum_width () const { return m_linenum_width; }
int get_x_offset_display () const { return m_x_offset_display; }
void print_gap_in_line_numbering ();
bool print_heading_for_line_span_index_p (int line_span_idx) const;
expanded_location get_expanded_location (const line_span *) const;
void print_line (linenum_type row);
private:
bool will_show_line_p (linenum_type row) const;
void print_leading_fixits (linenum_type row);
void print_source_line (linenum_type row, const char *line, int line_bytes,
line_bounds *lbounds_out);
bool should_print_annotation_line_p (linenum_type row) const;
void start_annotation_line (char margin_char = ' ') const;
void print_annotation_line (linenum_type row, const line_bounds lbounds);
void print_any_labels (linenum_type row);
void print_trailing_fixits (linenum_type row);
bool annotation_line_showed_range_p (linenum_type line, int start_column,
int finish_column) const;
void show_ruler (int max_column) const;
bool validate_fixit_hint_p (const fixit_hint *hint);
void calculate_line_spans ();
void calculate_linenum_width ();
void calculate_x_offset_display ();
void print_newline ();
bool
get_state_at_point (/* Inputs. */
linenum_type row, int column,
int first_non_ws, int last_non_ws,
enum column_unit col_unit,
/* Outputs. */
point_state *out_state);
int
get_x_bound_for_row (linenum_type row, int caret_column,
int last_non_ws);
void
move_to_column (int *column, int dest_column, bool add_left_margin);
private:
diagnostic_context *m_context;
pretty_printer *m_pp;
location_t m_primary_loc;
exploc_with_display_col m_exploc;
colorizer m_colorizer;
bool m_colorize_source_p;
bool m_show_labels_p;
bool m_show_line_numbers_p;
bool m_diagnostic_path_p;
auto_vec <layout_range> m_layout_ranges;
auto_vec <const fixit_hint *> m_fixit_hints;
auto_vec <line_span> m_line_spans;
int m_linenum_width;
int m_x_offset_display;
};
/* Implementation of "class colorizer". */
/* The constructor for "colorizer". Lookup and store color codes for the
different kinds of things we might need to print. */
colorizer::colorizer (diagnostic_context *context,
diagnostic_t diagnostic_kind) :
m_context (context),
m_diagnostic_kind (diagnostic_kind),
m_current_state (STATE_NORMAL_TEXT)
{
m_range1 = get_color_by_name ("range1");
m_range2 = get_color_by_name ("range2");
m_fixit_insert = get_color_by_name ("fixit-insert");
m_fixit_delete = get_color_by_name ("fixit-delete");
m_stop_color = colorize_stop (pp_show_color (context->printer));
}
/* The destructor for "colorize". If colorization is on, print a code to
turn it off. */
colorizer::~colorizer ()
{
finish_state (m_current_state);
}
/* Update state, printing color codes if necessary if there's a state
change. */
void
colorizer::set_state (int new_state)
{
if (m_current_state != new_state)
{
finish_state (m_current_state);
m_current_state = new_state;
begin_state (new_state);
}
}
/* Turn on any colorization for STATE. */
void
colorizer::begin_state (int state)
{
switch (state)
{
case STATE_NORMAL_TEXT:
break;
case STATE_FIXIT_INSERT:
pp_string (m_context->printer, m_fixit_insert);
break;
case STATE_FIXIT_DELETE:
pp_string (m_context->printer, m_fixit_delete);
break;
case 0:
/* Make range 0 be the same color as the "kind" text
(error vs warning vs note). */
pp_string
(m_context->printer,
colorize_start (pp_show_color (m_context->printer),
diagnostic_get_color_for_kind (m_diagnostic_kind)));
break;
case 1:
pp_string (m_context->printer, m_range1);
break;
case 2:
pp_string (m_context->printer, m_range2);
break;
default:
/* For ranges beyond 2, alternate between color 1 and color 2. */
{
gcc_assert (state > 2);
pp_string (m_context->printer,
state % 2 ? m_range1 : m_range2);
}
break;
}
}
/* Turn off any colorization for STATE. */
void
colorizer::finish_state (int state)
{
if (state != STATE_NORMAL_TEXT)
pp_string (m_context->printer, m_stop_color);
}
/* Get the color code for NAME (or the empty string if
colorization is disabled). */
const char *
colorizer::get_color_by_name (const char *name)
{
return colorize_start (pp_show_color (m_context->printer), name);
}
/* Implementation of class layout_range. */
/* The constructor for class layout_range.
Initialize various layout_point fields from expanded_location
equivalents; we've already filtered on file. */
layout_range::layout_range (const expanded_location *start_exploc,
const expanded_location *finish_exploc,
enum range_display_kind range_display_kind,
const expanded_location *caret_exploc,
unsigned original_idx,
const range_label *label)
: m_start (*start_exploc),
m_finish (*finish_exploc),
m_range_display_kind (range_display_kind),
m_caret (*caret_exploc),
m_original_idx (original_idx),
m_label (label)
{
}
/* Is (column, row) within the given range?
We've already filtered on the file.
Ranges are closed (both limits are within the range).
Example A: a single-line range:
start: (col=22, line=2)
finish: (col=38, line=2)
|00000011111111112222222222333333333344444444444
|34567890123456789012345678901234567890123456789
--+-----------------------------------------------
01|bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
02|bbbbbbbbbbbbbbbbbbbSwwwwwwwwwwwwwwwFaaaaaaaaaaa
03|aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Example B: a multiline range with
start: (col=14, line=3)
finish: (col=08, line=5)
|00000011111111112222222222333333333344444444444
|34567890123456789012345678901234567890123456789
--+-----------------------------------------------
01|bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
02|bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
03|bbbbbbbbbbbSwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
04|wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
05|wwwwwFaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
06|aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--+-----------------------------------------------
Legend:
- 'b' indicates a point *before* the range
- 'S' indicates the start of the range
- 'w' indicates a point within the range
- 'F' indicates the finish of the range (which is
within it).
- 'a' indicates a subsequent point *after* the range.
COL_UNIT controls whether we check the byte column or
the display column; one or the other is more convenient
depending on the context. */
bool
layout_range::contains_point (linenum_type row, int column,
enum column_unit col_unit) const
{
gcc_assert (m_start.m_line <= m_finish.m_line);
/* ...but the equivalent isn't true for the columns;
consider example B in the comment above. */
if (row < m_start.m_line)
/* Points before the first line of the range are
outside it (corresponding to line 01 in example A
and lines 01 and 02 in example B above). */
return false;
if (row == m_start.m_line)
/* On same line as start of range (corresponding
to line 02 in example A and line 03 in example B). */
{
if (column < m_start.m_columns[col_unit])
/* Points on the starting line of the range, but
before the column in which it begins. */
return false;
if (row < m_finish.m_line)
/* This is a multiline range; the point
is within it (corresponds to line 03 in example B
from column 14 onwards) */
return true;
else
{
/* This is a single-line range. */
gcc_assert (row == m_finish.m_line);
return column <= m_finish.m_columns[col_unit];
}
}
/* The point is in a line beyond that containing the
start of the range: lines 03 onwards in example A,
and lines 04 onwards in example B. */
gcc_assert (row > m_start.m_line);
if (row > m_finish.m_line)
/* The point is beyond the final line of the range
(lines 03 onwards in example A, and lines 06 onwards
in example B). */
return false;
if (row < m_finish.m_line)
{
/* The point is in a line that's fully within a multiline
range (e.g. line 04 in example B). */
gcc_assert (m_start.m_line < m_finish.m_line);
return true;
}
gcc_assert (row == m_finish.m_line);
return column <= m_finish.m_columns[col_unit];
}
/* Does this layout_range contain any part of line ROW? */
bool
layout_range::intersects_line_p (linenum_type row) const
{
gcc_assert (m_start.m_line <= m_finish.m_line);
if (row < m_start.m_line)
return false;
if (row > m_finish.m_line)
return false;
return true;
}
#if CHECKING_P
/* Create some expanded locations for testing layout_range. The filename
member of the explocs is set to the empty string. This member will only be
inspected by the calls to location_compute_display_column() made from the
layout_point constructors. That function will check for an empty filename
argument and not attempt to open it, rather treating the non-existent data
as if the display width were the same as the byte count. Tests exercising a
real difference between byte count and display width are performed later,
e.g. in test_diagnostic_show_locus_one_liner_utf8(). */
static layout_range
make_range (int start_line, int start_col, int end_line, int end_col)
{
const expanded_location start_exploc
= {"", start_line, start_col, NULL, false};
const expanded_location finish_exploc
= {"", end_line, end_col, NULL, false};
return layout_range (&start_exploc, &finish_exploc, SHOW_RANGE_WITHOUT_CARET,
&start_exploc, 0, NULL);
}
/* Selftests for layout_range::contains_point and
layout_range::intersects_line_p. */
/* Selftest for layout_range, where the layout_range
is a range with start==end i.e. a single point. */
static void
test_layout_range_for_single_point ()
{
layout_range point = make_range (7, 10, 7, 10);
/* Tests for layout_range::contains_point. */
for (int i = 0; i != CU_NUM_UNITS; ++i)
{
const enum column_unit col_unit = (enum column_unit) i;
/* Before the line. */
ASSERT_FALSE (point.contains_point (6, 1, col_unit));
/* On the line, but before start. */
ASSERT_FALSE (point.contains_point (7, 9, col_unit));
/* At the point. */
ASSERT_TRUE (point.contains_point (7, 10, col_unit));
/* On the line, after the point. */
ASSERT_FALSE (point.contains_point (7, 11, col_unit));
/* After the line. */
ASSERT_FALSE (point.contains_point (8, 1, col_unit));
}
/* Tests for layout_range::intersects_line_p. */
ASSERT_FALSE (point.intersects_line_p (6));
ASSERT_TRUE (point.intersects_line_p (7));
ASSERT_FALSE (point.intersects_line_p (8));
}
/* Selftest for layout_range, where the layout_range
is the single-line range shown as "Example A" above. */
static void
test_layout_range_for_single_line ()
{
layout_range example_a = make_range (2, 22, 2, 38);
/* Tests for layout_range::contains_point. */
for (int i = 0; i != CU_NUM_UNITS; ++i)
{
const enum column_unit col_unit = (enum column_unit) i;
/* Before the line. */
ASSERT_FALSE (example_a.contains_point (1, 1, col_unit));
/* On the line, but before start. */
ASSERT_FALSE (example_a.contains_point (2, 21, col_unit));
/* On the line, at the start. */
ASSERT_TRUE (example_a.contains_point (2, 22, col_unit));
/* On the line, within the range. */
ASSERT_TRUE (example_a.contains_point (2, 23, col_unit));
/* On the line, at the end. */
ASSERT_TRUE (example_a.contains_point (2, 38, col_unit));
/* On the line, after the end. */
ASSERT_FALSE (example_a.contains_point (2, 39, col_unit));
/* After the line. */
ASSERT_FALSE (example_a.contains_point (2, 39, col_unit));
}
/* Tests for layout_range::intersects_line_p. */
ASSERT_FALSE (example_a.intersects_line_p (1));
ASSERT_TRUE (example_a.intersects_line_p (2));
ASSERT_FALSE (example_a.intersects_line_p (3));
}
/* Selftest for layout_range, where the layout_range
is the multi-line range shown as "Example B" above. */
static void
test_layout_range_for_multiple_lines ()
{
layout_range example_b = make_range (3, 14, 5, 8);
/* Tests for layout_range::contains_point. */
for (int i = 0; i != CU_NUM_UNITS; ++i)
{
const enum column_unit col_unit = (enum column_unit) i;
/* Before first line. */
ASSERT_FALSE (example_b.contains_point (1, 1, col_unit));
/* On the first line, but before start. */
ASSERT_FALSE (example_b.contains_point (3, 13, col_unit));
/* At the start. */
ASSERT_TRUE (example_b.contains_point (3, 14, col_unit));
/* On the first line, within the range. */
ASSERT_TRUE (example_b.contains_point (3, 15, col_unit));
/* On an interior line.
The column number should not matter; try various boundary
values. */
ASSERT_TRUE (example_b.contains_point (4, 1, col_unit));
ASSERT_TRUE (example_b.contains_point (4, 7, col_unit));
ASSERT_TRUE (example_b.contains_point (4, 8, col_unit));
ASSERT_TRUE (example_b.contains_point (4, 9, col_unit));
ASSERT_TRUE (example_b.contains_point (4, 13, col_unit));
ASSERT_TRUE (example_b.contains_point (4, 14, col_unit));
ASSERT_TRUE (example_b.contains_point (4, 15, col_unit));
/* On the final line, before the end. */
ASSERT_TRUE (example_b.contains_point (5, 7, col_unit));
/* On the final line, at the end. */
ASSERT_TRUE (example_b.contains_point (5, 8, col_unit));
/* On the final line, after the end. */
ASSERT_FALSE (example_b.contains_point (5, 9, col_unit));
/* After the line. */
ASSERT_FALSE (example_b.contains_point (6, 1, col_unit));
}
/* Tests for layout_range::intersects_line_p. */
ASSERT_FALSE (example_b.intersects_line_p (2));
ASSERT_TRUE (example_b.intersects_line_p (3));
ASSERT_TRUE (example_b.intersects_line_p (4));
ASSERT_TRUE (example_b.intersects_line_p (5));
ASSERT_FALSE (example_b.intersects_line_p (6));
}
#endif /* #if CHECKING_P */
/* Given a source line LINE of length LINE_BYTES bytes, determine the length
(still in bytes, not display cols) without any trailing whitespace. */
static int
get_line_bytes_without_trailing_whitespace (const char *line, int line_bytes)
{
int result = line_bytes;
while (result > 0)
{
char ch = line[result - 1];
if (ch == ' ' || ch == '\t' || ch == '\r')
result--;
else
break;
}
gcc_assert (result >= 0);
gcc_assert (result <= line_bytes);
gcc_assert (result == 0 ||
(line[result - 1] != ' '
&& line[result -1] != '\t'
&& line[result -1] != '\r'));
return result;
}
#if CHECKING_P
/* A helper function for testing get_line_bytes_without_trailing_whitespace. */
static void
assert_eq (const char *line, int expected_bytes)
{
int actual_value
= get_line_bytes_without_trailing_whitespace (line, strlen (line));
ASSERT_EQ (actual_value, expected_bytes);
}
/* Verify that get_line_bytes_without_trailing_whitespace is sane for
various inputs. It is not required to handle newlines. */
static void
test_get_line_bytes_without_trailing_whitespace ()
{
assert_eq ("", 0);
assert_eq (" ", 0);
assert_eq ("\t", 0);
assert_eq ("\r", 0);
assert_eq ("hello world", 11);
assert_eq ("hello world ", 11);
assert_eq ("hello world \t\t ", 11);
assert_eq ("hello world\r", 11);
}
#endif /* #if CHECKING_P */
/* Helper function for layout's ctor, for sanitizing locations relative
to the primary location within a diagnostic.
Compare LOC_A and LOC_B to see if it makes sense to print underlines
connecting their expanded locations. Doing so is only guaranteed to
make sense if the locations share the same macro expansion "history"
i.e. they can be traced through the same macro expansions, eventually
reaching an ordinary map.
This may be too strong a condition, but it effectively sanitizes
PR c++/70105, which has an example of printing an expression where the
final location of the expression is in a different macro, which
erroneously was leading to hundreds of lines of irrelevant source
being printed. */
static bool
compatible_locations_p (location_t loc_a, location_t loc_b)
{
if (IS_ADHOC_LOC (loc_a))
loc_a = get_location_from_adhoc_loc (line_table, loc_a);
if (IS_ADHOC_LOC (loc_b))
loc_b = get_location_from_adhoc_loc (line_table, loc_b);
/* If either location is one of the special locations outside of a
linemap, they are only compatible if they are equal. */
if (loc_a < RESERVED_LOCATION_COUNT
|| loc_b < RESERVED_LOCATION_COUNT)
return loc_a == loc_b;
const line_map *map_a = linemap_lookup (line_table, loc_a);
linemap_assert (map_a);
const line_map *map_b = linemap_lookup (line_table, loc_b);
linemap_assert (map_b);
/* Are they within the same map? */
if (map_a == map_b)
{
/* Are both within the same macro expansion? */
if (linemap_macro_expansion_map_p (map_a))
{
/* Expand each location towards the spelling location, and
recurse. */
const line_map_macro *macro_map = linemap_check_macro (map_a);
location_t loc_a_toward_spelling
= linemap_macro_map_loc_unwind_toward_spelling (line_table,
macro_map,
loc_a);
location_t loc_b_toward_spelling
= linemap_macro_map_loc_unwind_toward_spelling (line_table,
macro_map,
loc_b);
return compatible_locations_p (loc_a_toward_spelling,
loc_b_toward_spelling);
}
/* Otherwise they are within the same ordinary map. */
return true;
}
else
{
/* Within different maps. */
/* If either is within a macro expansion, they are incompatible. */
if (linemap_macro_expansion_map_p (map_a)
|| linemap_macro_expansion_map_p (map_b))
return false;
/* Within two different ordinary maps; they are compatible iff they
are in the same file. */
const line_map_ordinary *ord_map_a = linemap_check_ordinary (map_a);
const line_map_ordinary *ord_map_b = linemap_check_ordinary (map_b);
return ord_map_a->to_file == ord_map_b->to_file;
}
}
/* Comparator for sorting fix-it hints. */
static int
fixit_cmp (const void *p_a, const void *p_b)
{
const fixit_hint * hint_a = *static_cast<const fixit_hint * const *> (p_a);
const fixit_hint * hint_b = *static_cast<const fixit_hint * const *> (p_b);
return hint_a->get_start_loc () - hint_b->get_start_loc ();
}
/* Implementation of class layout. */
/* Constructor for class layout.
Filter the ranges from the rich_location to those that we can
sanely print, populating m_layout_ranges and m_fixit_hints.
Determine the range of lines that we will print, splitting them
up into an ordered list of disjoint spans of contiguous line numbers.
Determine m_x_offset_display, to ensure that the primary caret
will fit within the max_width provided by the diagnostic_context. */
layout::layout (diagnostic_context * context,
rich_location *richloc,
diagnostic_t diagnostic_kind)
: m_context (context),
m_pp (context->printer),
m_primary_loc (richloc->get_range (0)->m_loc),
m_exploc (richloc->get_expanded_location (0)),
m_colorizer (context, diagnostic_kind),
m_colorize_source_p (context->colorize_source_p),
m_show_labels_p (context->show_labels_p),
m_show_line_numbers_p (context->show_line_numbers_p),
m_diagnostic_path_p (diagnostic_kind == DK_DIAGNOSTIC_PATH),
m_layout_ranges (richloc->get_num_locations ()),
m_fixit_hints (richloc->get_num_fixit_hints ()),
m_line_spans (1 + richloc->get_num_locations ()),
m_linenum_width (0),
m_x_offset_display (0)
{
for (unsigned int idx = 0; idx < richloc->get_num_locations (); idx++)
{
/* This diagnostic printer can only cope with "sufficiently sane" ranges.
Ignore any ranges that are awkward to handle. */
const location_range *loc_range = richloc->get_range (idx);
maybe_add_location_range (loc_range, idx, false);
}
/* Populate m_fixit_hints, filtering to only those that are in the
same file. */
for (unsigned int i = 0; i < richloc->get_num_fixit_hints (); i++)
{
const fixit_hint *hint = richloc->get_fixit_hint (i);
if (validate_fixit_hint_p (hint))
m_fixit_hints.safe_push (hint);
}
/* Sort m_fixit_hints. */
m_fixit_hints.qsort (fixit_cmp);
/* Populate the indicated members. */
calculate_line_spans ();