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372 lines
15 KiB
372 lines
15 KiB
6 years ago
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From e385593eef98ac92be57159e141f4b805dadbbb3 Mon Sep 17 00:00:00 2001
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From: Jan Kratochvil <jan.kratochvil@redhat.com>
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Date: Mon, 30 May 2016 14:14:43 +0200
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Subject: [PATCH 2/2] PR 15231: import bare DW_TAG_lexical_block
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Local variables in lambdas are not accessible
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https://sourceware.org/bugzilla/show_bug.cgi?id=15231
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GDB: read_lexical_block_scope
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/* Ignore blocks with missing or invalid low and high pc attributes. */
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[...]
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if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
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return;
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But sometimes there is:
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FAIL: gcc-5.3.1-6.fc23.x86_64
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<2><92>: Abbrev Number: 11 (DW_TAG_lexical_block)
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<3><9c>: Abbrev Number: 13 (DW_TAG_structure_type)
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<9d> DW_AT_name : (indirect string, offset: 0x3c): <lambda()>
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[...]
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Where DW_TAG_lexical_block has no attributes. Such whole subtree is currently
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dropped by GDB while I think it should just import all its children DIEs.
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It even XFAIL->XPASSes gdb.ada/out_of_line_in_inlined.exp:
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commit 0fa7fe506c242b459c4c05d331e7c7d66fb52390
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Author: Joel Brobecker <brobecker@adacore.com>
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out of line functions nested inside inline functions.
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So I have removed that xfail.
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gdb/ChangeLog
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2016-05-30 Jan Kratochvil <jan.kratochvil@redhat.com>
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PR c++/15231
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* dwarf2read.c (enum pc_bounds_kind): Add PC_BOUNDS_INVALID.
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(process_psymtab_comp_unit_reader, read_func_scope): Adjust callers.
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(read_lexical_block_scope): Import DIEs from bare DW_TAG_lexical_block.
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(read_call_site_scope): Adjust callers.
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(dwarf2_get_pc_bounds): Implement pc_bounds_invalid.
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(dwarf2_get_subprogram_pc_bounds, get_scope_pc_bounds): Adjust callers.
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gdb/testsuite/ChangeLog
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2016-05-30 Jan Kratochvil <jan.kratochvil@redhat.com>
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PR c++/15231
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* gdb.ada/out_of_line_in_inlined.exp: Remove xfails.
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* gdb.dwarf2/dw2-lexical-block-bare.exp: New file.
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---
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gdb/ChangeLog | 10 ++++
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gdb/dwarf2read.c | 53 ++++++++++------
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gdb/testsuite/ChangeLog | 6 ++
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gdb/testsuite/gdb.ada/out_of_line_in_inlined.exp | 6 --
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.../gdb.dwarf2/dw2-lexical-block-bare.exp | 70 ++++++++++++++++++++++
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5 files changed, 120 insertions(+), 25 deletions(-)
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create mode 100644 gdb/testsuite/gdb.dwarf2/dw2-lexical-block-bare.exp
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### a/gdb/ChangeLog
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### b/gdb/ChangeLog
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## -1,5 +1,15 @@
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2016-05-30 Jan Kratochvil <jan.kratochvil@redhat.com>
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+ PR c++/15231
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+ * dwarf2read.c (enum pc_bounds_kind): Add PC_BOUNDS_INVALID.
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+ (process_psymtab_comp_unit_reader, read_func_scope): Adjust callers.
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+ (read_lexical_block_scope): Import DIEs from bare DW_TAG_lexical_block.
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+ (read_call_site_scope): Adjust callers.
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+ (dwarf2_get_pc_bounds): Implement pc_bounds_invalid.
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+ (dwarf2_get_subprogram_pc_bounds, get_scope_pc_bounds): Adjust callers.
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+
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+2016-05-30 Jan Kratochvil <jan.kratochvil@redhat.com>
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+
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Code cleanup: dwarf2_get_pc_bounds: -1/0/+1 -> enum
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* dwarf2read.c (enum pc_bounds_kind) New.
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(dwarf2_get_pc_bounds): Use it in the declaration.
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Index: gdb-7.6.1/gdb/dwarf2read.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/dwarf2read.c 2016-05-30 15:07:34.285853679 +0200
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+++ gdb-7.6.1/gdb/dwarf2read.c 2016-05-30 15:08:13.485197538 +0200
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@@ -1486,13 +1486,16 @@
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struct dwarf2_cu *, struct partial_symtab *);
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/* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
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- values. */
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+ values. Keep the items ordered with increasing constraints compliance. */
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enum pc_bounds_kind
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{
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- /* No valid combination of DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
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- was found. */
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+ /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
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PC_BOUNDS_NOT_PRESENT,
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+ /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
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+ were present but they do not form a valid range of PC addresses. */
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+ PC_BOUNDS_INVALID,
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+
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/* Discontiguous range was found - that is DW_AT_ranges was found. */
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PC_BOUNDS_RANGES,
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@@ -5027,7 +5030,7 @@
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first_die = load_partial_dies (reader, info_ptr, 1);
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scan_partial_symbols (first_die, &lowpc, &highpc,
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- cu_bounds_kind == PC_BOUNDS_NOT_PRESENT, cu);
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+ cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
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/* If we didn't find a lowpc, set it to highpc to avoid
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complaints from `maint check'. */
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@@ -5036,7 +5039,7 @@
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/* If the compilation unit didn't have an explicit address range,
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then use the information extracted from its child dies. */
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- if (cu_bounds_kind == PC_BOUNDS_NOT_PRESENT)
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+ if (cu_bounds_kind <= PC_BOUNDS_INVALID)
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{
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best_lowpc = lowpc;
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best_highpc = highpc;
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@@ -9606,7 +9609,7 @@
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/* Ignore functions with missing or invalid low and high pc attributes. */
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if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
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- == PC_BOUNDS_NOT_PRESENT)
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+ <= PC_BOUNDS_INVALID)
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{
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attr = dwarf2_attr (die, DW_AT_external, cu);
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if (!attr || !DW_UNSND (attr))
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@@ -9763,9 +9766,20 @@
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as multiple lexical blocks? Handling children in a sane way would
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be nasty. Might be easier to properly extend generic blocks to
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describe ranges. */
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- if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
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- == PC_BOUNDS_NOT_PRESENT)
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- return;
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+ switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
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+ {
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+ case PC_BOUNDS_NOT_PRESENT:
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+ /* DW_TAG_lexical_block has no attributes, process its children as if
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+ there was no wrapping by that DW_TAG_lexical_block.
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+ GCC does no longer produces such DWARF since GCC r224161. */
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+ for (child_die = die->child;
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+ child_die != NULL && child_die->tag;
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+ child_die = sibling_die (child_die))
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+ process_die (child_die, cu);
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+ return;
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+ case PC_BOUNDS_INVALID:
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+ return;
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+ }
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lowpc += baseaddr;
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highpc += baseaddr;
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@@ -9970,7 +9984,7 @@
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/* DW_AT_entry_pc should be preferred. */
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if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
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- == PC_BOUNDS_NOT_PRESENT)
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+ <= PC_BOUNDS_INVALID)
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complaint (&symfile_complaints,
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_("DW_AT_GNU_call_site_target target DIE has invalid "
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"low pc, for referencing DIE 0x%x [in module %s]"),
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@@ -10249,7 +10263,7 @@
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/* Get low and high pc attributes from a die. See enum pc_bounds_kind
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definition for the return value. *LOWPC and *HIGHPC are set iff
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- PC_BOUNDS_NOT_PRESENT is not returned. */
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+ neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
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static enum pc_bounds_kind
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dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
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@@ -10260,7 +10274,7 @@
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struct attribute *attr_high;
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CORE_ADDR low = 0;
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CORE_ADDR high = 0;
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- enum pc_bounds_kind ret = PC_BOUNDS_NOT_PRESENT;
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+ enum pc_bounds_kind ret;
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attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
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if (attr_high)
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@@ -10277,7 +10291,7 @@
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}
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else
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/* Found high w/o low attribute. */
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- return PC_BOUNDS_NOT_PRESENT;
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+ return PC_BOUNDS_INVALID;
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/* Found consecutive range of addresses. */
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ret = PC_BOUNDS_HIGH_LOW;
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@@ -10299,15 +10313,17 @@
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/* Value of the DW_AT_ranges attribute is the offset in the
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.debug_ranges section. */
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if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
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- return PC_BOUNDS_NOT_PRESENT;
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+ return PC_BOUNDS_INVALID;
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/* Found discontinuous range of addresses. */
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ret = PC_BOUNDS_RANGES;
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}
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+ else
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+ return PC_BOUNDS_NOT_PRESENT;
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}
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/* read_partial_die has also the strict LOW < HIGH requirement. */
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if (high <= low)
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- return PC_BOUNDS_NOT_PRESENT;
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+ return PC_BOUNDS_INVALID;
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/* When using the GNU linker, .gnu.linkonce. sections are used to
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eliminate duplicate copies of functions and vtables and such.
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@@ -10318,7 +10334,7 @@
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If this is a discarded function, mark the pc bounds as invalid,
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so that GDB will ignore it. */
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if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
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- return PC_BOUNDS_NOT_PRESENT;
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+ return PC_BOUNDS_INVALID;
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*lowpc = low;
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if (highpc)
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@@ -10339,8 +10355,7 @@
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CORE_ADDR low, high;
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struct die_info *child = die->child;
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- if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL)
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- != PC_BOUNDS_NOT_PRESENT)
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+ if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
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{
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*lowpc = min (*lowpc, low);
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*highpc = max (*highpc, high);
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@@ -10378,7 +10393,7 @@
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CORE_ADDR current_low, current_high;
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if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
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- != PC_BOUNDS_NOT_PRESENT)
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+ >= PC_BOUNDS_RANGES)
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{
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best_low = current_low;
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best_high = current_high;
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--- /dev/null 2016-05-30 15:04:01.916990766 +0200
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+++ gdb-7.6.1/gdb/testsuite/gdb.dwarf2/dw2-lexical-block-bare.exp 2016-05-30 15:19:22.236042134 +0200
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@@ -0,0 +1,32 @@
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+# Copyright 2016 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+load_lib dwarf.exp
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+
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+# This test can only be run on targets which support DWARF-2 and use gas.
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+if {![dwarf2_support]} {
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+ return 0
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+}
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+
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+standard_testfile .S main.c
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+
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+if { [prepare_for_testing ${testfile}.exp ${testfile} \
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+ [list $srcfile2 $srcfile] {nodebug}] } {
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+ return -1
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+}
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+
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+runto_main
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+
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+# FAILing GDB did print: No symbol "testvar" in current context.
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+gdb_test "p testvar" { = -?[0-9]+}
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--- /dev/null 2016-05-30 15:04:01.916990766 +0200
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+++ gdb-7.6.1/gdb/testsuite/gdb.dwarf2/dw2-lexical-block-bare.S 2016-05-30 15:17:42.580173290 +0200
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@@ -0,0 +1,89 @@
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+ .section .debug_info
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+.Lcu1_begin:
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+ .4byte .Lcu1_end - .Lcu1_start
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+.Lcu1_start:
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+ .2byte 4 /* Version */
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+ .4byte .Labbrev1_begin /* Abbrevs */
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+ .byte 4 /* Pointer size */
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+ .uleb128 2 /* Abbrev (DW_TAG_compile_unit) */
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+ .4byte main_label
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+ .4byte main_label+0x10000
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+.Llabel1:
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+ .uleb128 3 /* Abbrev (DW_TAG_base_type) */
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+ .sleb128 4
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+ .sleb128 0x5
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+ .ascii "integer\0"
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+ .uleb128 4 /* Abbrev (DW_TAG_subprogram) */
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+ .ascii "main\0"
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+ .byte 1
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+ .4byte main_label
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+ .4byte main_label+0x10000
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+ .uleb128 5 /* Abbrev (DW_TAG_lexical_block) */
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+ .uleb128 6 /* Abbrev (DW_TAG_variable) */
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+ .ascii "testvar\0"
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+ .4byte .Llabel1 - .Lcu1_begin
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+ .byte 1
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+ .uleb128 .Lexpr_end3 - .Lexpr_start2/* expression */
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+.Lexpr_start2:
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+ .byte 0x03 /* DW_OP_addr */
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+ .4byte main
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+.Lexpr_end3:
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+ .byte 0x0 /* Terminate children */
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+ .byte 0x0 /* Terminate children */
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+ .byte 0x0 /* Terminate children */
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+.Lcu1_end:
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+ .section .debug_abbrev
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+.Labbrev1_begin:
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+ .uleb128 2 /* Abbrev start */
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+ .uleb128 0x11 /* DW_TAG_compile_unit */
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+ .byte 1 /* has_children */
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+ .uleb128 0x11 /* DW_AT_low_pc */
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+ .uleb128 0x01 /* DW_FORM_addr */
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+ .uleb128 0x12 /* DW_AT_high_pc */
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+ .uleb128 0x01 /* DW_FORM_addr */
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+ .byte 0x0 /* Terminator */
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+ .byte 0x0 /* Terminator */
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+ .uleb128 3 /* Abbrev start */
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+ .uleb128 0x24 /* DW_TAG_base_type */
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+ .byte 0 /* has_children */
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+ .uleb128 0x0b /* DW_AT_byte_size */
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+ .uleb128 0x0d /* DW_FORM_sdata */
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+ .uleb128 0x3e /* DW_AT_encoding */
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+ .uleb128 0x0d /* DW_FORM_sdata */
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+ .uleb128 0x03 /* DW_AT_name */
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+ .uleb128 0x08 /* DW_FORM_string */
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+ .byte 0x0 /* Terminator */
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+ .byte 0x0 /* Terminator */
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+ .uleb128 4 /* Abbrev start */
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+ .uleb128 0x2e /* DW_TAG_subprogram */
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+ .byte 1 /* has_children */
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+ .uleb128 0x03 /* DW_AT_name */
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+ .uleb128 0x08 /* DW_FORM_string */
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+ .uleb128 0x3f /* DW_AT_external */
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+ .uleb128 0x0c /* DW_FORM_flag */
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+ .uleb128 0x11 /* DW_AT_low_pc */
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+ .uleb128 0x01 /* DW_FORM_addr */
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+ .uleb128 0x12 /* DW_AT_high_pc */
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+ .uleb128 0x01 /* DW_FORM_addr */
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+ .byte 0x0 /* Terminator */
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+ .byte 0x0 /* Terminator */
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+ .uleb128 5 /* Abbrev start */
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+ .uleb128 0x0b /* DW_TAG_lexical_block */
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+ .byte 1 /* has_children */
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+ .byte 0x0 /* Terminator */
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+ .byte 0x0 /* Terminator */
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+ .uleb128 6 /* Abbrev start */
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+ .uleb128 0x34 /* DW_TAG_variable */
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+ .byte 0 /* has_children */
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+ .uleb128 0x03 /* DW_AT_name */
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+ .uleb128 0x08 /* DW_FORM_string */
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+ .uleb128 0x49 /* DW_AT_type */
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+ .uleb128 0x13 /* DW_FORM_ref4 */
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+ .uleb128 0x3f /* DW_AT_external */
|
||
|
+ .uleb128 0x0c /* DW_FORM_flag */
|
||
|
+ .uleb128 0x02 /* DW_AT_location */
|
||
|
+ .uleb128 0x09 /* SPECIAL_expr */
|
||
|
+ .byte 0x0 /* Terminator */
|
||
|
+ .byte 0x0 /* Terminator */
|
||
|
+ .byte 0x0 /* Terminator */
|
||
|
+ .byte 0x0 /* Terminator */
|
||
|
diff -dup -rup gdb-7.6.1/gdb/testsuite/gdb.dwarf2/main.c gdb-7.6.1-orig/gdb/testsuite/gdb.dwarf2/main.c
|
||
|
--- gdb-7.6.1/gdb/testsuite/gdb.dwarf2/main.c 2013-01-01 07:41:22.000000000 +0100
|
||
|
+++ gdb-7.6.1-orig/gdb/testsuite/gdb.dwarf2/main.c 2017-03-08 22:20:21.085438961 +0100
|
||
|
@@ -20,5 +20,6 @@
|
||
|
int
|
||
|
main()
|
||
|
{
|
||
|
+ asm ("main_label: .globl main_label");
|
||
|
return 0;
|
||
|
}
|