search for: udata4

...there are no Exception Tables generated any more such as the one below: .section .gcc_except_table,"a", at progbits .align 4 GCC_except_table0: .Lexception0: .byte 255 # @LPStart Encoding = omit .byte 3 # @TType Encoding = udata4 .uleb128 41 # @TType base offset .byte 3 # Call site Encoding = udata4 .uleb128 39 # Call site table length .Lset0 = .Leh_func_begin0-.Leh_func_begin0 # Region start .long .Lset0 .Lset1 = .Ltmp0-.Leh_func_begin0 # Re...

...exception tables)? Ciao, Duncan. > > .section .gcc_except_table,"a", at progbits > .align 4 > GCC_except_table0: > .Lexception0: > .byte 255 # @LPStart Encoding = omit > .byte 3 # @TType Encoding = udata4 > .uleb128 41 # @TType base offset > .byte 3 # Call site Encoding = udata4 > .uleb128 39 # Call site table length > .Lset0 = .Leh_func_begin0-.Leh_func_begin0 # Region start > .long .Lset0 > .Lset1 = ....

...c > .Leh_func_end0: > .section .gcc_except_table,"a", at progbits > .align 4 > GCC_except_table0: > .Lexception0: > .byte 255 # @LPStart Encoding = omit > .byte 3 # @TType Encoding = udata4 > .asciz "\242\200\200" # @TType base offset > .byte 3 # Call site Encoding = udata4 > .byte 26 # Call site table length > .Lset0 = .Ltmp0-.Leh_func_begin0 # >> Call Site 1 << &...

...gt; >> >> .section .gcc_except_table,"a", at progbits >> .align 4 >> GCC_except_table0: >> .Lexception0: >> .byte 255 # @LPStart Encoding = omit >> .byte 3 # @TType Encoding = udata4 >> .uleb128 41 # @TType base offset >> .byte 3 # Call site Encoding = udata4 >> .uleb128 39 # Call site table length >> .Lset0 = .Leh_func_begin0-.Leh_func_begin0 # Region start >> .long...

...bles)? >> >> Ciao, Duncan. >> >>> >>> .section .gcc_except_table,"a", at progbits >>> .align 4 >>> GCC_except_table0: >>> .Lexception0: >>> .byte 255 # @LPStart Encoding = omit >>> .byte 3 # @TType Encoding = udata4 >>> .uleb128 41 # @TType base offset >>> .byte 3 # Call site Encoding = udata4 >>> .uleb128 39 # Call site table length >>> .Lset0 = .Leh_func_begin0-.Leh_func_begin0 # Region start >>> .long .Lset0 >>> .Lset1 = .Ltmp0-.Leh_func_begin0 # Region...

...pt_tab .align 2 GCC_except_table0: Lexception0: .byte 255 ## @LPStart Encoding = omit .byte 155 ## @TType Encoding = indirect pcrel sdata4 .byte 156 ## @TType base offset .space 1 .byte 3 ## Call site Encoding = udata4 .byte 26 ## Call site table length ## >> Call Site 1 << ## Call between Ltmp0 and Ltmp1 ## jumps to Ltmp2...

...dA t.cpp -O3 .text .align 4,0x90 .globl __Z3foov __Z3foov: . . . LEHB0: call __Z3bazv LEHE0: . . . GCC_except_table0: LLSDA8: .byte 0xff # @LPStart format (omit) .byte 0x9b # @TType format (indirect pcrel sdata4) .byte 0x25 # uleb128 0x25; @TType base offset .byte 0x3 # call-site format (udata4) .byte 0x1a # uleb128 0x1a; Call-site table length .set L$set$0,LEHB0-LFB8 .long L$set$0 # region 0 start .set L$set$1,LEHE0-LEHB0 .long L$set$1 # length .set L$set$2,L6-LFB8 .long L$set$2 # landing pad .byte 0x1 # uleb128 0x1; action .set L$set$3,LEHB1-LFB8 .long L$set$3 # region 1 start...

John, I'm still not sure what you're talking about, I have included the assembly output from two compilations, one with a user explicit catch-all, one with only an implicit cleanup, the DWARF Action Table and Types Table are absolutely identical, as are the indexes used to reference the Action Table from the region maps. -Peter Lawrence.

...# @LPStart format (omit) .byte 0 # @TType format (absptr) .uleb128 15 # @TType base offset .byte 3 # Call site format (udata4) .uleb128 13 # Call site table size .long .Llabel1-.Leh_func_begin1 # Region start .long .Llabel2-.Llabel1 # Region length .long .Llabel3-.Leh_func_begin1 # Landing pad .uleb128 0...

...are much larger -- the .ARM.extab section is about 2.5 times as large in two examples. I noticed a couple of differences between Clang and GCC: 1. *ULEB128 encoding.* In the call site table, GCC encodes offsets using a ULEB128 variable-length encoding, whereas LLVM uses fixed-size 32-bit values (udata4). Switching to ULEB128 is a large size improvement. For instance, I'm currently playing with Qt5, and the libQt5Core.so binary is about 4MB with a 215KB .ARM.extab section. Switching the encoding cuts the .ARM.extab section down to 100KB for an overall file size reduction of about 2.9%. There...

...# @LPStart format (DW_EH_PE_omit) .byte 0x0 # @TType format (DW_EH_PE_absptr) .uleb128 28 # @TType base offset .byte 0x3 # Call site format (DW_EH_PE_udata4) .uleb128 26 # Call site table size .long .Llabel291-.Leh_func_begin153 # Region start .long .Llabel292-.Llabel291 # Region length .long .Llabel293-.Leh_func_begin153 # Landing pad .ul...

Bill, ooops, yes, I described the meaning of "throw(A)" backwards, but I still think my example shows why you cannot merge LandingpadInst while inlining because multiple filter-lists on a LandingpadInst don't make sense. Perhaps I'm reading your original spec wrong, perhaps I'm mis-reading Duncan's emails, but I read them to mean that your syntax supports

Hi, I'm trying to get exception handling working in my compiler targetting LLVM. I've been working from the LLVM exception handling documentation (including http://llvm.org/docs/ExceptionHandling.html and http://wiki.llvm.org/HowTo:_Build_JIT_based_Exception_mechanism) and looking at g++-llvm's output. I've been trying to get a minimal test function to work, which simply invokes

...gt; (DW_EH_PE_omit) > .byte 0x0 # @TType format > (DW_EH_PE_absptr) > .uleb128 28 # @TType base offset > > .byte 0x3 # Call site format > (DW_EH_PE_udata4) > .uleb128 26 # Call site table size > .long .Llabel291-.Leh_func_begin153 # Region start > .long .Llabel292-.Llabel291 # Region length > .long .Llabel293-.Leh_func_begin153 #...

...i callq _Unwind_Resume .Ltmp4: .size _Z3barv, .Ltmp4-_Z3barv .cfi_endproc .Leh_func_end0: .section .gcc_except_table,"a", at progbits .align 4 GCC_except_table0: .Lexception0: .byte 255 # @LPStart Encoding = omit .byte 3 # @TType Encoding = udata4 .asciz "\256\200\200" # @TType base offset .byte 3 # Call site Encoding = udata4 .byte 26 # Call site table length .Lset0 = .Ltmp0-.Leh_func_begin0 # >> Call Site 1 << .long .Lset0 .Lset1 = .Ltmp1-.Ltmp0...