diff options
| author | Björn Gustavsson <[email protected]> | 2011-05-03 14:20:22 +0200 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2011-05-11 09:20:01 +0200 |
| commit | 8d1dd7079fdcd22765b30a1268649022360f6f56 (patch) | |
| tree | ded2ecc4254e6668ef4c8ff38081001170a8949d /erts | |
| parent | 2ef48dca9328e0b928117f21bc9ee6dbc5a614cc (diff) | |
| download | otp-8d1dd7079fdcd22765b30a1268649022360f6f56.tar.gz otp-8d1dd7079fdcd22765b30a1268649022360f6f56.tar.bz2 otp-8d1dd7079fdcd22765b30a1268649022360f6f56.zip | |
erl_trace: Eliminate alias warning
Avoid creating two variable names referring to the same memory
area, because that can cause aliasing warnings in some versions of
gcc.
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/emulator/beam/erl_trace.c | 22 | ||||
| -rw-r--r-- | erts/emulator/beam/global.h | 6 |
2 files changed, 16 insertions, 12 deletions
diff --git a/erts/emulator/beam/erl_trace.c b/erts/emulator/beam/erl_trace.c index c0397ca6c3..8833137112 100644 --- a/erts/emulator/beam/erl_trace.c +++ b/erts/emulator/beam/erl_trace.c @@ -1538,8 +1538,7 @@ erts_call_trace(Process* p, BeamInstr mfa[3], Binary *match_spec, Eterm tracee; #endif Eterm transformed_args[MAX_ARG]; - DeclareTmpHeap(sub_bin_heap_et,ERL_SUB_BIN_SIZE,p); - ErlSubBin *sub_bin_heap = (ErlSubBin *) sub_bin_heap_et; + DeclareTypedTmpHeap(ErlSubBin,sub_bin_heap,p); ASSERT(tracer_pid); if (*tracer_pid == am_true) { @@ -1600,21 +1599,20 @@ erts_call_trace(Process* p, BeamInstr mfa[3], Binary *match_spec, if (is_boxed(arg) && header_is_bin_matchstate(*boxed_val(arg))) { ErlBinMatchState* ms = (ErlBinMatchState *) boxed_val(arg); ErlBinMatchBuffer* mb = &ms->mb; - ErlSubBin* sb = sub_bin_heap; Uint bit_size; ASSERT(sub_bin_heap->thing_word == 0); /* At most one of match context */ bit_size = mb->size - mb->offset; - sb->thing_word = HEADER_SUB_BIN; - sb->size = BYTE_OFFSET(bit_size); - sb->bitsize = BIT_OFFSET(bit_size); - sb->offs = BYTE_OFFSET(mb->offset); - sb->bitoffs = BIT_OFFSET(mb->offset); - sb->is_writable = 0; - sb->orig = mb->orig; - - arg = make_binary(sb); + sub_bin_heap->thing_word = HEADER_SUB_BIN; + sub_bin_heap->size = BYTE_OFFSET(bit_size); + sub_bin_heap->bitsize = BIT_OFFSET(bit_size); + sub_bin_heap->offs = BYTE_OFFSET(mb->offset); + sub_bin_heap->bitoffs = BIT_OFFSET(mb->offset); + sub_bin_heap->is_writable = 0; + sub_bin_heap->orig = mb->orig; + + arg = make_binary(sub_bin_heap); } transformed_args[i] = arg; } diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h index 96da894d90..857aab2126 100644 --- a/erts/emulator/beam/global.h +++ b/erts/emulator/beam/global.h @@ -1890,6 +1890,8 @@ erts_alloc_message_heap(Uint size, # if defined(DEBUG) # define DeclareTmpHeap(VariableName,Size,Process) \ Eterm *VariableName = erts_debug_allocate_tmp_heap(Size,Process) +# define DeclareTypedTmpHeap(Type,VariableName,Process) \ + Type *VariableName = (Type *) erts_debug_allocate_tmp_heap(sizeof(Type)/sizeof(Eterm),Process) # define DeclareTmpHeapNoproc(VariableName,Size) \ Eterm *VariableName = erts_debug_allocate_tmp_heap(Size,NULL) # define UseTmpHeap(Size,Proc) \ @@ -1911,6 +1913,8 @@ erts_alloc_message_heap(Uint size, # else # define DeclareTmpHeap(VariableName,Size,Process) \ Eterm *VariableName = (ERTS_PROC_GET_SCHDATA(Process)->tmp_heap)+(ERTS_PROC_GET_SCHDATA(Process)->num_tmp_heap_used) +# define DeclareTypedTmpHeap(Type,VariableName,Process) \ + Type *VariableName = (Type *) (ERTS_PROC_GET_SCHDATA(Process)->tmp_heap)+(ERTS_PROC_GET_SCHDATA(Process)->num_tmp_heap_used) # define DeclareTmpHeapNoproc(VariableName,Size) \ Eterm *VariableName = (erts_get_scheduler_data()->tmp_heap)+(erts_get_scheduler_data()->num_tmp_heap_used) # define UseTmpHeap(Size,Proc) \ @@ -1936,6 +1940,8 @@ erts_alloc_message_heap(Uint size, #else # define DeclareTmpHeap(VariableName,Size,Process) \ Eterm VariableName[Size] +# define DeclareTypedTmpHeap(Type,VariableName,Process) \ + Type VariableName[1] # define DeclareTmpHeapNoproc(VariableName,Size) \ Eterm VariableName[Size] # define UseTmpHeap(Size,Proc) /* Nothing */ |