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valgrind/valgrind-3.11.0-is_stmt.patch

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Add valgrind-3.11.0-is_stmt.patch
2016-01-21 14:19:44 +00:00
commit 434c7524413a8a47ae40e4b141f5821eabc506b7
Author: iraisr <iraisr@a5019735-40e9-0310-863c-91ae7b9d1cf9>
Date: Fri Dec 4 13:14:10 2015 +0000
Dwarf line info reader now correctly interprets 'is_stmt' register
Line numbers should correctly reflect all instructions belonging to a source line,
regardless of is_stmt value. Previously only instructions covered by
'is_stmt = 1' were attributed to a source line.
Fixes BZ#356044
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15741 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_debuginfo/readdwarf.c b/coregrind/m_debuginfo/readdwarf.c
index 88d49e9..a95bb3d 100644
--- a/coregrind/m_debuginfo/readdwarf.c
+++ b/coregrind/m_debuginfo/readdwarf.c
@@ -91,7 +91,6 @@ typedef struct
ULong li_header_length;
UChar li_min_insn_length;
UChar li_max_ops_per_insn;
- UChar li_default_is_stmt;
Int li_line_base;
UChar li_line_range;
UChar li_opcode_base;
@@ -150,7 +149,6 @@ typedef struct
UInt file;
UInt line;
UInt column;
- Int is_stmt;
Int basic_block;
UChar end_sequence;
} LineSMR;
@@ -230,7 +228,7 @@ ULong read_initial_length_field ( DiCursor p_img, /*OUT*/Bool* is64 )
static LineSMR state_machine_regs;
static
-void reset_state_machine ( Int is_stmt )
+void reset_state_machine ( void )
{
if (0) VG_(printf)("smr.a := %p (reset)\n", NULL );
state_machine_regs.last_address = 0;
@@ -240,7 +238,6 @@ void reset_state_machine ( Int is_stmt )
state_machine_regs.file = 1;
state_machine_regs.line = 1;
state_machine_regs.column = 0;
- state_machine_regs.is_stmt = is_stmt;
state_machine_regs.basic_block = 0;
state_machine_regs.end_sequence = 0;
}
@@ -253,7 +250,7 @@ void reset_state_machine ( Int is_stmt )
static
void process_extended_line_op( struct _DebugInfo* di,
XArray* fndn_ix_xa,
- DiCursor* data, Int is_stmt)
+ DiCursor* data )
{
UInt len = step_leb128U(data);
if (len == 0) {
@@ -275,19 +272,17 @@ void process_extended_line_op( struct _DebugInfo* di,
reset_state_machine below */
state_machine_regs.end_sequence = 1;
- if (state_machine_regs.is_stmt) {
- if (state_machine_regs.last_address) {
- ML_(addLineInfo) (
- di,
- safe_fndn_ix (fndn_ix_xa,
- state_machine_regs.last_file),
- di->text_debug_bias + state_machine_regs.last_address,
- di->text_debug_bias + state_machine_regs.address,
- state_machine_regs.last_line, 0
- );
- }
+ if (state_machine_regs.last_address) {
+ ML_(addLineInfo)(
+ di,
+ safe_fndn_ix(fndn_ix_xa,
+ state_machine_regs.last_file),
+ di->text_debug_bias + state_machine_regs.last_address,
+ di->text_debug_bias + state_machine_regs.address,
+ state_machine_regs.last_line, 0
+ );
}
- reset_state_machine (is_stmt);
+ reset_state_machine();
if (di->ddump_line)
VG_(printf)(" Extended opcode %d: End of Sequence\n\n",
(Int)op_code);
@@ -446,29 +441,9 @@ void read_dwarf2_lineblock ( struct _DebugInfo* di,
info.li_max_ops_per_insn = 1;
}
- info.li_default_is_stmt = ML_(cur_step_UChar)(&external);
- if (di->ddump_line)
- VG_(printf)(" Initial value of 'is_stmt': %d\n",
- (Int)info.li_default_is_stmt);
-
- /* Josef Weidendorfer (20021021) writes:
-
- It seems to me that the Intel Fortran compiler generates bad
- DWARF2 line info code: It sets "is_stmt" of the state machine in
- the line info reader to be always false. Thus, there is never
- a statement boundary generated and therefore never an instruction
- range/line number mapping generated for valgrind.
-
- Please have a look at the DWARF2 specification, Ch. 6.2
- (x86.ddj.com/ftp/manuals/tools/dwarf.pdf). Perhaps I understand
- this wrong, but I don't think so.
-
- I just had a look at the GDB DWARF2 reader... They completely
- ignore "is_stmt" when recording line info ;-) That's the reason
- "objdump -S" works on files from the intel fortran compiler.
-
- Therefore: */
- info.li_default_is_stmt = True;
+ /* Register is_stmt is not tracked as we are interested only
+ in pc -> line info mapping and not other debugger features. */
+ /* default_is_stmt = */ ML_(cur_step_UChar)(&external);
/* JRS: changed (UInt*) to (UChar*) */
info.li_line_base = ML_(cur_step_UChar)(&external);
@@ -495,7 +470,7 @@ void read_dwarf2_lineblock ( struct _DebugInfo* di,
DiCursor end_of_sequence
= ML_(cur_plus)(data, info.li_length + (is64 ? 12 : 4));
- reset_state_machine (info.li_default_is_stmt);
+ reset_state_machine();
/* Read the contents of the Opcodes table. */
DiCursor standard_opcodes = external;
@@ -632,55 +607,49 @@ void read_dwarf2_lineblock ( struct _DebugInfo* di,
(Int)op_code, advAddr, state_machine_regs.address,
(Int)adv, (Int)state_machine_regs.line );
- if (state_machine_regs.is_stmt) {
- /* only add a statement if there was a previous boundary */
- if (state_machine_regs.last_address) {
- ML_(addLineInfo)(
- di,
- safe_fndn_ix (fndn_ix_xa,
- state_machine_regs.last_file),
- di->text_debug_bias + state_machine_regs.last_address,
- di->text_debug_bias + state_machine_regs.address,
- state_machine_regs.last_line,
- 0
- );
- }
- state_machine_regs.last_address = state_machine_regs.address;
- state_machine_regs.last_file = state_machine_regs.file;
- state_machine_regs.last_line = state_machine_regs.line;
+ /* only add a statement if there was a previous boundary */
+ if (state_machine_regs.last_address) {
+ ML_(addLineInfo)(
+ di,
+ safe_fndn_ix(fndn_ix_xa,
+ state_machine_regs.last_file),
+ di->text_debug_bias + state_machine_regs.last_address,
+ di->text_debug_bias + state_machine_regs.address,
+ state_machine_regs.last_line,
+ 0
+ );
}
+ state_machine_regs.last_address = state_machine_regs.address;
+ state_machine_regs.last_file = state_machine_regs.file;
+ state_machine_regs.last_line = state_machine_regs.line;
}
else { /* ! (op_code >= info.li_opcode_base) */
switch (op_code) {
case DW_LNS_extended_op:
- process_extended_line_op (
- di, fndn_ix_xa,
- &data, info.li_default_is_stmt);
+ process_extended_line_op(di, fndn_ix_xa, &data);
break;
case DW_LNS_copy:
if (0) VG_(printf)("1002: di->o %#lx, smr.a %#lx\n",
(UWord)di->text_debug_bias,
state_machine_regs.address );
- if (state_machine_regs.is_stmt) {
- /* only add a statement if there was a previous boundary */
- if (state_machine_regs.last_address) {
- ML_(addLineInfo)(
- di,
- safe_fndn_ix (fndn_ix_xa,
- state_machine_regs.last_file),
- di->text_debug_bias + state_machine_regs.last_address,
- di->text_debug_bias + state_machine_regs.address,
- state_machine_regs.last_line,
- 0
- );
- }
- state_machine_regs.last_address = state_machine_regs.address;
- state_machine_regs.last_file = state_machine_regs.file;
- state_machine_regs.last_line = state_machine_regs.line;
+ /* only add a statement if there was a previous boundary */
+ if (state_machine_regs.last_address) {
+ ML_(addLineInfo)(
+ di,
+ safe_fndn_ix(fndn_ix_xa,
+ state_machine_regs.last_file),
+ di->text_debug_bias + state_machine_regs.last_address,
+ di->text_debug_bias + state_machine_regs.address,
+ state_machine_regs.last_line,
+ 0
+ );
}
+ state_machine_regs.last_address = state_machine_regs.address;
+ state_machine_regs.last_file = state_machine_regs.file;
+ state_machine_regs.last_line = state_machine_regs.line;
state_machine_regs.basic_block = 0; /* JRS added */
if (di->ddump_line)
VG_(printf)(" Copy\n");
@@ -719,9 +688,6 @@ void read_dwarf2_lineblock ( struct _DebugInfo* di,
break;
}
case DW_LNS_negate_stmt: {
- Int adv = state_machine_regs.is_stmt;
- adv = ! adv;
- state_machine_regs.is_stmt = adv;
if (di->ddump_line)
VG_(printf)(" DWARF2-line: negate_stmt\n");
break;
diff --git a/coregrind/m_debuginfo/storage.c b/coregrind/m_debuginfo/storage.c
index 7b2e26a..e6a9856 100644
--- a/coregrind/m_debuginfo/storage.c
+++ b/coregrind/m_debuginfo/storage.c
@@ -419,6 +419,21 @@ static void addLoc ( struct _DebugInfo* di, DiLoc* loc, UInt fndn_ix )
/* Zero-sized locs should have been ignored earlier */
vg_assert(loc->size > 0);
+ /* Check if the last entry has adjacent range for the same line. */
+ if (di->loctab_used > 0) {
+ DiLoc *previous = &di->loctab[di->loctab_used - 1];
+ if ((previous->lineno == loc->lineno)
+ && (previous->addr + previous->size == loc->addr)) {
+ if (0)
+ VG_(printf)("Merging previous: addr %#lx, size %d, line %d, "
+ "with current: addr %#lx, size %d, line %d.\n",
+ previous->addr, previous->size, previous->lineno,
+ loc->addr, loc->size, loc->lineno);
+ previous->size += loc->size;
+ return;
+ }
+ }
+
if (di->loctab_used == di->loctab_size) {
UInt new_sz;
DiLoc* new_loctab;
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