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- Implement DW_OP_call_frame_cfa (for recent GCC).

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This commit is contained in:
Jan Kratochvil 2009-06-12 10:35:49 +00:00
parent 859e1355cf
commit 638b7b7c33
2 changed files with 175 additions and 1 deletions
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167
gdb-DW_OP_call_frame_cfa.patch Normal file
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@ -0,0 +1,167 @@
http://sourceware.org/ml/gdb-patches/2009-06/msg00191.html
GCC developers would like to change GCC to emit DW_OP_call_frame_cfa,
as this would reduce the size of the generated debuginfo.
A prerequisite to this is that GDB understand this. So, this patch
implements this feature. This is PR 10224.
I'm interested in feedback on this. I am not sure whether the
implementation of dwarf2_frame_cfa is ok.
No test case since at some point GCC will start generating this
(perhaps optionally -- but I feel certain we'll do it by default in
Fedora), and since it therefore seemed like a lot of work for little
payoff.
Tom
2009-06-08 Tom Tromey <tromey@redhat.com>
PR gdb/10224:
* dwarf2loc.c: Include dwarf2-frame.h.
(dwarf_expr_frame_cfa): New function.
(dwarf2_evaluate_loc_desc): Initialize new field.
(needs_frame_frame_cfa): New function.
(dwarf2_loc_desc_needs_frame): Initialize new field.
* dwarf2expr.h (struct dwarf_expr_context) <get_frame_cfa>: New
field.
* dwarf2expr.c (execute_stack_op) <DW_OP_call_frame_cfa>: New
case.
* dwarf2-frame.h (dwarf2_frame_cfa): Declare.
* dwarf2-frame.c (no_get_frame_cfa): New function.
(execute_stack_op): Initialize new field.
(dwarf2_frame_cfa): New function.
[ Backported for Fedora Rawhide. ]
--- ./gdb/dwarf2-frame.c 2009-06-12 11:12:51.000000000 +0200
+++ ./gdb/dwarf2-frame.c 2009-06-12 11:13:30.000000000 +0200
@@ -306,6 +306,13 @@ no_get_frame_base (void *baton, gdb_byte
}
static CORE_ADDR
+no_get_frame_cfa (void *baton)
+{
+ internal_error (__FILE__, __LINE__,
+ _("Support for DW_OP_call_frame_cfa is unimplemented"));
+}
+
+static CORE_ADDR
no_get_tls_address (void *baton, CORE_ADDR offset)
{
internal_error (__FILE__, __LINE__,
@@ -356,6 +363,7 @@ execute_stack_op (gdb_byte *exp, ULONGES
ctx->read_reg = read_reg;
ctx->read_mem = read_mem;
ctx->get_frame_base = no_get_frame_base;
+ ctx->get_frame_cfa = no_get_frame_cfa;
ctx->get_tls_address = no_get_tls_address;
dwarf_expr_push (ctx, initial);
@@ -1221,6 +1229,13 @@ dwarf2_frame_base_address (struct frame_
return cache->cfa;
}
+CORE_ADDR
+dwarf2_frame_cfa (struct frame_info *this_frame)
+{
+ void *cache = NULL;
+ return dwarf2_frame_base_address (this_frame, &cache);
+}
+
static const struct frame_base dwarf2_frame_base =
{
&dwarf2_frame_unwind,
--- ./gdb/dwarf2-frame.h 2009-01-03 06:57:51.000000000 +0100
+++ ./gdb/dwarf2-frame.h 2009-06-12 11:13:30.000000000 +0200
@@ -118,4 +118,8 @@ extern const struct frame_base *
void dwarf2_frame_build_info (struct objfile *objfile);
+/* Compute the DWARF CFA for a frame. */
+
+CORE_ADDR dwarf2_frame_cfa (struct frame_info *this_frame);
+
#endif /* dwarf2-frame.h */
--- ./gdb/dwarf2expr.c 2009-06-12 11:12:51.000000000 +0200
+++ ./gdb/dwarf2expr.c 2009-06-12 11:13:44.000000000 +0200
@@ -697,6 +697,10 @@ execute_stack_op (struct dwarf_expr_cont
}
break;
+ case DW_OP_call_frame_cfa:
+ result = (ctx->get_frame_cfa) (ctx->baton);
+ break;
+
case DW_OP_GNU_push_tls_address:
/* Variable is at a constant offset in the thread-local
storage block into the objfile for the current thread and
--- ./gdb/dwarf2expr.h 2009-06-12 11:12:51.000000000 +0200
+++ ./gdb/dwarf2expr.h 2009-06-12 11:15:36.000000000 +0200
@@ -55,6 +55,9 @@ struct dwarf_expr_context
expression evaluation is complete. */
void (*get_frame_base) (void *baton, gdb_byte **start, size_t *length);
+ /* Return the CFA for the frame. */
+ CORE_ADDR (*get_frame_cfa) (void *baton);
+
/* Return the thread-local storage address for
DW_OP_GNU_push_tls_address. */
CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset);
--- ./gdb/dwarf2loc.c 2009-06-12 11:12:55.000000000 +0200
+++ ./gdb/dwarf2loc.c 2009-06-12 11:15:07.000000000 +0200
@@ -32,6 +32,7 @@
#include "objfiles.h"
#include "exceptions.h"
#include "block.h"
+#include "dwarf2-frame.h"
#include "elf/dwarf2.h"
#include "dwarf2expr.h"
@@ -200,6 +201,13 @@ dwarf_expr_frame_base (void *baton, gdb_
SYMBOL_PRINT_NAME (framefunc));
}
+static CORE_ADDR
+dwarf_expr_frame_cfa (void *baton)
+{
+ struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
+ return dwarf2_frame_cfa (debaton->frame);
+}
+
/* Using the objfile specified in BATON, find the address for the
current thread's thread-local storage with offset OFFSET. */
static CORE_ADDR
@@ -286,6 +294,7 @@ dwarf_expr_prep_ctx (struct frame_info *
ctx->read_reg = dwarf_expr_read_reg;
ctx->read_mem = dwarf_expr_read_mem;
ctx->get_frame_base = dwarf_expr_frame_base;
+ ctx->get_frame_cfa = dwarf_expr_frame_cfa;
ctx->get_tls_address = dwarf_expr_tls_address;
ctx->get_object_address = dwarf_expr_object_address;
@@ -439,6 +448,15 @@ needs_frame_frame_base (void *baton, gdb
nf_baton->needs_frame = 1;
}
+/* CFA accesses require a frame. */
+static CORE_ADDR
+needs_frame_frame_cfa (void *baton)
+{
+ struct needs_frame_baton *nf_baton = baton;
+ nf_baton->needs_frame = 1;
+ return 1;
+}
+
/* Thread-local accesses do require a frame. */
static CORE_ADDR
needs_frame_tls_address (void *baton, CORE_ADDR offset)
@@ -468,6 +486,7 @@ dwarf2_loc_desc_needs_frame (gdb_byte *d
ctx->read_reg = needs_frame_read_reg;
ctx->read_mem = needs_frame_read_mem;
ctx->get_frame_base = needs_frame_frame_base;
+ ctx->get_frame_cfa = needs_frame_frame_cfa;
ctx->get_tls_address = needs_frame_tls_address;
dwarf_expr_eval (ctx, data, size);

9
gdb.spec
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@ -15,7 +15,7 @@ Version: 6.8.50.20090302
# The release always contains a leading reserved number, start it at 1.
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
Release: 29%{?_with_upstream:.upstream}%{?dist}
Release: 30%{?_with_upstream:.upstream}%{?dist}
License: GPLv3+
Group: Development/Debuggers
@ -387,6 +387,9 @@ Patch359: gdb-charset-crash.patch
Patch369: gdb-varobj-revalidate-prep.patch
Patch370: gdb-varobj-revalidate-core.patch
# Implement DW_OP_call_frame_cfa (for recent GCC).
Patch373: gdb-DW_OP_call_frame_cfa.patch
BuildRequires: ncurses-devel texinfo gettext flex bison expat-devel
Requires: readline
BuildRequires: readline-devel
@ -587,6 +590,7 @@ rm -f gdb/jv-exp.c gdb/m2-exp.c gdb/objc-exp.c gdb/p-exp.c
%patch360 -p1
%patch369 -p1
%patch370 -p1
%patch373 -p1
%patch124 -p1
find -name "*.orig" | xargs rm -f
@ -887,6 +891,9 @@ fi
%endif
%changelog
* Fri Jun 12 2009 Jan Kratochvil <jan.kratochvil@redhat.com> - 6.8.50.20090302-30
- Implement DW_OP_call_frame_cfa (for recent GCC).
* Thu Jun 11 2009 Jan Kratochvil <jan.kratochvil@redhat.com> - 6.8.50.20090302-29
- Archer update to the snapshot: 30c13da4efe18f43ee34aa4b29bc86e1a53de548
- Archer backport: 30c13da4efe18f43ee34aa4b29bc86e1a53de548