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Change dwarf2_frame_state_reg_info::reg to be std::vector

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This changes dwarf2_frame_state_reg_info::reg to be a std::vector.
This avoids passing NULL to memcpy in the copy constructor when the
original object does not have any registers.

gdb/ChangeLog
2018-10-03  Tom Tromey  <tom@tromey.com>

	* dwarf2-frame.h (dwarf2_frame_state_reg_info)
	<~dwarf2_frame_state_reg_info>: Update.
	<dwarf2_frame_state_reg_info>: Update.
	<alloc_regs>: Add assertion.  Update.
	<reg>: Now a std::vector.
	<num_regs>: Remove.
	<swap>: Update.
	* dwarf2-frame.c (dwarf2_restore_rule, execute_cfa_program)
	(execute_cfa_program_test, dwarf2_frame_cache): Update.
This commit is contained in:
Tom Tromey
2018-08-28 16:14:52 -06:00
parent 10657c047e
commit 780942fc24
3 changed files with 35 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
gdb/ChangeLog
View File

@ -1,3 +1,15 @@
2018-10-03 Tom Tromey <tom@tromey.com>
* dwarf2-frame.h (dwarf2_frame_state_reg_info)
<~dwarf2_frame_state_reg_info>: Update.
<dwarf2_frame_state_reg_info>: Update.
<alloc_regs>: Add assertion. Update.
<reg>: Now a std::vector.
<num_regs>: Remove.
<swap>: Update.
* dwarf2-frame.c (dwarf2_restore_rule, execute_cfa_program)
(execute_cfa_program_test, dwarf2_frame_cache): Update.
2018-10-03 Tom Tromey <tom@tromey.com>
* namespace.c (add_using_directive): Don't pass NULL to memcpy.

28
gdb/dwarf2-frame.c
View File

@ -204,14 +204,13 @@ dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num,
{
ULONGEST reg;
gdb_assert (fs->initial.reg);
reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p);
fs->regs.alloc_regs (reg + 1);
/* Check if this register was explicitly initialized in the
CIE initial instructions. If not, default the rule to
UNSPECIFIED. */
if (reg < fs->initial.num_regs)
if (reg < fs->initial.reg.size ())
fs->regs.reg[reg] = fs->initial.reg[reg];
else
fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED;
@ -602,7 +601,7 @@ bad CFI data; mismatched DW_CFA_restore_state at %s"),
}
}
if (fs->initial.reg == NULL)
if (fs->initial.reg.empty ())
{
/* Don't allow remember/restore between CIE and FDE programs. */
delete fs->regs.prev;
@ -653,12 +652,12 @@ execute_cfa_program_test (struct gdbarch *gdbarch)
auto r1 = dwarf2_frame_adjust_regnum (gdbarch, 1, fde.eh_frame_p);
auto r2 = dwarf2_frame_adjust_regnum (gdbarch, 2, fde.eh_frame_p);
SELF_CHECK (fs.regs.num_regs == (std::max (r1, r2) + 1));
SELF_CHECK (fs.regs.reg.size () == (std::max (r1, r2) + 1));
SELF_CHECK (fs.regs.reg[r2].how == DWARF2_FRAME_REG_SAVED_OFFSET);
SELF_CHECK (fs.regs.reg[r2].loc.offset == -4);
for (auto i = 0; i < fs.regs.num_regs; i++)
for (auto i = 0; i < fs.regs.reg.size (); i++)
if (i != r2)
SELF_CHECK (fs.regs.reg[i].how == DWARF2_FRAME_REG_UNSPECIFIED);
@ -1097,7 +1096,7 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
{
int column; /* CFI speak for "register number". */
for (column = 0; column < fs.regs.num_regs; column++)
for (column = 0; column < fs.regs.reg.size (); column++)
{
/* Use the GDB register number as the destination index. */
int regnum = dwarf_reg_to_regnum (gdbarch, column);
@ -1140,8 +1139,9 @@ incomplete CFI data; unspecified registers (e.g., %s) at %s"),
if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA
|| cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET)
{
struct dwarf2_frame_state_reg *retaddr_reg =
&fs.regs.reg[fs.retaddr_column];
const std::vector<struct dwarf2_frame_state_reg> &regs
= fs.regs.reg;
ULONGEST retaddr_column = fs.retaddr_column;
/* It seems rather bizarre to specify an "empty" column as
the return adress column. However, this is exactly
@ -1150,14 +1150,14 @@ incomplete CFI data; unspecified registers (e.g., %s) at %s"),
register corresponding to the return address column.
Incidentally, that's how we should treat a return
address column specifying "same value" too. */
if (fs.retaddr_column < fs.regs.num_regs
&& retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED
&& retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE)
if (fs.retaddr_column < fs.regs.reg.size ()
&& regs[retaddr_column].how != DWARF2_FRAME_REG_UNSPECIFIED
&& regs[retaddr_column].how != DWARF2_FRAME_REG_SAME_VALUE)
{
if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA)
cache->reg[regnum] = *retaddr_reg;
cache->reg[regnum] = regs[retaddr_column];
else
cache->retaddr_reg = *retaddr_reg;
cache->retaddr_reg = regs[retaddr_column];
}
else
{
@ -1176,7 +1176,7 @@ incomplete CFI data; unspecified registers (e.g., %s) at %s"),
}
}
if (fs.retaddr_column < fs.regs.num_regs
if (fs.retaddr_column < fs.regs.reg.size ()
&& fs.regs.reg[fs.retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED)
cache->undefined_retaddr = 1;

31
gdb/dwarf2-frame.h
View File

@ -98,19 +98,14 @@ struct dwarf2_frame_state_reg_info
~dwarf2_frame_state_reg_info ()
{
delete prev;
xfree (reg);
}
/* Copy constructor. */
dwarf2_frame_state_reg_info (const dwarf2_frame_state_reg_info &src)
: num_regs (src.num_regs), cfa_offset (src.cfa_offset),
: reg (src.reg), cfa_offset (src.cfa_offset),
cfa_reg (src.cfa_reg), cfa_how (src.cfa_how), cfa_exp (src.cfa_exp),
prev (src.prev)
{
size_t size = src.num_regs * sizeof (struct dwarf2_frame_state_reg);
reg = (struct dwarf2_frame_state_reg *) xmalloc (size);
memcpy (reg, src.reg, size);
}
/* Assignment operator for both move-assignment and copy-assignment. */
@ -123,33 +118,26 @@ struct dwarf2_frame_state_reg_info
/* Move constructor. */
dwarf2_frame_state_reg_info (dwarf2_frame_state_reg_info &&rhs) noexcept
: reg (rhs.reg), num_regs (rhs.num_regs), cfa_offset (rhs.cfa_offset),
: reg (std::move (rhs.reg)), cfa_offset (rhs.cfa_offset),
cfa_reg (rhs.cfa_reg), cfa_how (rhs.cfa_how), cfa_exp (rhs.cfa_exp),
prev (rhs.prev)
{
rhs.prev = nullptr;
rhs.reg = nullptr;
}
/* Assert that the register set RS is large enough to store gdbarch_num_regs
columns. If necessary, enlarge the register set. */
/* If necessary, enlarge the register set to hold NUM_REGS_REQUESTED
registers. */
void alloc_regs (int num_regs_requested)
{
if (num_regs_requested <= num_regs)
gdb_assert (num_regs_requested > 0);
if (num_regs_requested <= reg.size ())
return;
size_t size = sizeof (struct dwarf2_frame_state_reg);
reg = (struct dwarf2_frame_state_reg *)
xrealloc (reg, num_regs_requested * size);
/* Initialize newly allocated registers. */
memset (reg + num_regs, 0, (num_regs_requested - num_regs) * size);
num_regs = num_regs_requested;
reg.resize (num_regs_requested);
}
struct dwarf2_frame_state_reg *reg = NULL;
int num_regs = 0;
std::vector<struct dwarf2_frame_state_reg> reg;
LONGEST cfa_offset = 0;
ULONGEST cfa_reg = 0;
@ -166,7 +154,6 @@ private:
using std::swap;
swap (lhs.reg, rhs.reg);
swap (lhs.num_regs, rhs.num_regs);
swap (lhs.cfa_offset, rhs.cfa_offset);
swap (lhs.cfa_reg, rhs.cfa_reg);
swap (lhs.cfa_how, rhs.cfa_how);