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authorGeza Lore <gezalore@gmail.com>2016-01-18 00:21:51 +0100
committerAnton Khirnov <anton@khirnov.net>2016-01-23 20:46:28 +0100
commitcc602061ee860b041013397e27a036b85cd87b09 (patch)
tree61d6c76ea3ffc687a70cae4ca57471ef145eef42 /libavutil
parent002c47798da0c43a053822c8041144798d49ed84 (diff)
downloadffmpeg-streaming-cc602061ee860b041013397e27a036b85cd87b09.zip
ffmpeg-streaming-cc602061ee860b041013397e27a036b85cd87b09.tar.gz
x86inc: Add debug symbols indicating sizes of compiled functions
Some debuggers/profilers use this metadata to determine which function a given instruction is in; without it they get can confused by local labels (if you haven't stripped those). On the other hand, some tools are still confused even with this metadata. e.g. this fixes `gdb`, but not `perf`. Currently only implemented for ELF. Signed-off-by: Anton Khirnov <anton@khirnov.net>
Diffstat (limited to 'libavutil')
-rw-r--r--libavutil/x86/x86inc.asm23
1 files changed, 23 insertions, 0 deletions
diff --git a/libavutil/x86/x86inc.asm b/libavutil/x86/x86inc.asm
index 8a74830..20ef7b8 100644
--- a/libavutil/x86/x86inc.asm
+++ b/libavutil/x86/x86inc.asm
@@ -634,6 +634,7 @@ DECLARE_ARG 7, 8, 9, 10, 11, 12, 13, 14
%else
rep ret
%endif
+ annotate_function_size
%endmacro
%define last_branch_adr $$
@@ -642,6 +643,7 @@ DECLARE_ARG 7, 8, 9, 10, 11, 12, 13, 14
times ((last_branch_adr-$)>>31)+1 rep ; times 1 iff $ == last_branch_adr.
%endif
ret
+ annotate_function_size
%endmacro
%macro BRANCH_INSTR 0-*
@@ -666,6 +668,7 @@ BRANCH_INSTR jz, je, jnz, jne, jl, jle, jnl, jnle, jg, jge, jng, jnge, ja, jae,
%elif %2
jmp %1
%endif
+ annotate_function_size
%endmacro
;=============================================================================
@@ -687,6 +690,7 @@ BRANCH_INSTR jz, je, jnz, jne, jl, jle, jnl, jnle, jg, jge, jng, jnge, ja, jae,
cglobal_internal 0, %1 %+ SUFFIX, %2
%endmacro
%macro cglobal_internal 2-3+
+ annotate_function_size
%if %1
%xdefine %%FUNCTION_PREFIX private_prefix
%xdefine %%VISIBILITY hidden
@@ -700,6 +704,7 @@ BRANCH_INSTR jz, je, jnz, jne, jl, jle, jnl, jnle, jg, jge, jng, jnge, ja, jae,
CAT_XDEFINE cglobaled_, %2, 1
%endif
%xdefine current_function %2
+ %xdefine current_function_section __SECT__
%if FORMAT_ELF
global %2:function %%VISIBILITY
%else
@@ -748,6 +753,24 @@ BRANCH_INSTR jz, je, jnz, jne, jl, jle, jnl, jnle, jg, jge, jng, jnge, ja, jae,
[SECTION .note.GNU-stack noalloc noexec nowrite progbits]
%endif
+; Tell debuggers how large the function was.
+; This may be invoked multiple times per function; we rely on later instances overriding earlier ones.
+; This is invoked by RET and similar macros, and also cglobal does it for the previous function,
+; but if the last function in a source file doesn't use any of the standard macros for its epilogue,
+; then its size might be unspecified.
+%macro annotate_function_size 0
+ %ifdef __YASM_VER__
+ %ifdef current_function
+ %if FORMAT_ELF
+ current_function_section
+ %%ecf equ $
+ size current_function %%ecf - current_function
+ __SECT__
+ %endif
+ %endif
+ %endif
+%endmacro
+
; cpuflags
%assign cpuflags_mmx (1<<0)
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