mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-22 23:17:28 +08:00
1559f7f458
- The commit "Cygwin: fix new sigfe.o generation in optimized case" fixed the wrong tlsoffsets generation by adding -O0 to compile options. Current gentls_offsets expects entry of "start_offset" is the first entry in the assembler code. However, without -O0, entry of "start_offset" goes to the last entry for some reason. Currently, -O0 can prevents assembler code from reversing the order of the entries, however, there is no guarantee that it will retain the order of the entries in the future. This patch makes gentls_offsets parse the assembler code in the two pass to omit -O0 option dependency.
101 lines
2.9 KiB
Bash
Executable File
101 lines
2.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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#set -x
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input_file=$1
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output_file=$2
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tmp_file=/tmp/${output_file}.$$
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trap "rm -f ${tmp_file}" 0 1 2 15
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# Preprocess cygtls.h and filter out only the member lines from
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# class _cygtls to generate an input file for the cross compiler
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# to generate the member offsets for tlsoffsets-$(target_cpu).h.
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${CXXCOMPILE} -E -P "${input_file}" 2> /dev/null | \
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gawk '
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BEGIN {
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# marker is used to split out the member lines from class _cygtls
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marker=0;
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# Prepare the input file for the subsequent compiler run.
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# Prepend value of __CYGTLS_PADSIZE__ so we can compute the offsets
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# up and down at the same time
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print "#include \"winsup.h\"";
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print "#include \"cygtls.h\"";
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print "extern \"C\" const uint32_t __CYGTLS__start_offset = __CYGTLS_PADSIZE__;";
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}
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/^class _cygtls$/ {
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# Ok, bump marker, next we are expecting a "public:" line
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marker=1;
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}
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/^public:/ {
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# We are only interested in the lines between the first (marker == 2)
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# and the second (marker == 3) "public:" line in class _cygtls. These
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# are where the members are defined.
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if (marker > 0) ++marker;
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if (marker > 2) exit;
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}
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{
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if (marker == 2 && $1 != "public:") {
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# Filter out function names
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$0 = gensub (/\(\*(\w+)\)\s*\([^\)]*\)/, "\\1", "g");
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# Filter out leading asterisk
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$NF = gensub (/^\**(\w+)/, "\\1", "g", $NF);
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# Filter out trailing array expression
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$NF = gensub (/(\w+)\s*\[[^\]]*\]/, "\\1", "g", $NF);
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$NF = gensub (/(\w+);/, "\\1", "g", $NF);
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print "extern \"C\" const uint32_t __CYGTLS__" $NF " = offsetof (class _cygtls, " $NF ");";
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}
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}
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' | \
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# Now run the compiler to generate an assembler file.
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${CXXCOMPILE} -x c++ -g0 -S - -o ${tmp_file} && \
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# The assembler file consists of lines like these:
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#
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# __CYGTLS__foo
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# .long 42
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# .globl __CYGTLS__foo
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# .align 4
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#
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# From this info, generate the tlsoffsets file.
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start_offset=$(gawk '\
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BEGIN {
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varname=""
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}
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/^__CYGTLS__/ {
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varname = gensub (/__CYGTLS__(\w+):/, "\\1", "g");
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}
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/\s*\.long\s+/ {
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if (length (varname) > 0) {
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if (varname == "start_offset") {
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print $2;
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}
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varname = "";
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}
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}
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' ${tmp_file}) && \
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gawk -v start_offset="$start_offset" '\
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BEGIN {
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varname=""
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}
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/^__CYGTLS__/ {
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varname = gensub (/__CYGTLS__(\w+):/, "\\1", "g");
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}
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/\s*\.space\s*4/ {
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if (length (varname) > 0) {
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printf (".equ _cygtls.%s, %d\n", varname, -start_offset);
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printf (".equ _cygtls.%s_p, 0\n", varname);
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varname = "";
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}
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}
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/\s*\.long\s+/ {
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if (length (varname) > 0) {
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if (varname == "start_offset") {
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printf (".equ _cygtls.%s, -%u\n", varname, start_offset);
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} else {
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value = $2;
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printf (".equ _cygtls.%s, %d\n", varname, value - start_offset);
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printf (".equ _cygtls.%s_p, %d\n", varname, value);
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}
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varname = "";
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}
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}
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' ${tmp_file} > "${output_file}"
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