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[ELF] - Teach input section wildcard patterns to recognize '?' meta character. 

`?' - matches any single character
https://sourceware.org/binutils/docs/ld/Input-Section-Wildcards.html

This is used in linker scripts.

Differential revision: http://reviews.llvm.org/D17290

llvm-svn: 261726
This commit is contained in:
George Rimar 2016-02-24 08:49:50 +00:00
parent a1f2d27da2
commit cb2aeb66e4
3 changed files with 84 additions and 17 deletions
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7
lld/ELF/LinkerScript.cpp
View File

@ -66,8 +66,9 @@ int LinkerScript::compareSections(StringRef A, StringRef B) {
return I < J ? -1 : 1;
}
// Returns true if S matches T. S may contain a meta character '*'
// which matches zero or more occurrences of any character.
// Returns true if S matches T. S can contain glob meta-characters.
// The asterisk ('*') matches zero or more characacters, and the question
// mark ('?') matches one character.
static bool matchStr(StringRef S, StringRef T) {
for (;;) {
if (S.empty())
@ -82,7 +83,7 @@ static bool matchStr(StringRef S, StringRef T) {
return true;
return false;
}
if (T.empty() || S[0] != T[0])
if (T.empty() || (S[0] != T[0] && S[0] != '?'))
return false;
S = S.substr(1);
T = T.substr(1);

14
lld/test/ELF/linkerscript-sections.s
View File

@ -38,20 +38,6 @@
# RUN: llvm-objdump -section-headers %t3 | \
# RUN: FileCheck -check-prefix=SEC-ORDER %s
# The same test as above but with wildcard patterns.
# RUN: echo "SECTIONS { \
# RUN: .bss : { *(.bss) } \
# RUN: other : { *(o*er) } \
# RUN: .shstrtab : { *(.shstrt*) } \
# RUN: .symtab : { *(.symtab) } \
# RUN: .strtab : { *(.strtab) } \
# RUN: .data : { *(*data) } \
# RUN: .text : { *(.text) } }" > %t.script
# RUN: cp %t %t.abc
# RUN: ld.lld -o %t3 --script %t.script %t.abc
# RUN: llvm-objdump -section-headers %t3 | \
# RUN: FileCheck -check-prefix=SEC-ORDER %s
# Idx Name Size
# SEC-ORDER: 1 .bss 00000002 {{[0-9a-f]*}} BSS
# SEC-ORDER: 2 other 00000003 {{[0-9a-f]*}} DATA

80
lld/test/ELF/wildcards.s Normal file
View File

@ -0,0 +1,80 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
## Default case: abc and abx included in text.
# RUN: echo "SECTIONS { \
# RUN: .text : { *(.abc .abx) } }" > %t.script
# RUN: ld.lld -o %t.out --script %t.script %t
# RUN: llvm-objdump -section-headers %t.out | \
# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
# SEC-DEFAULT: Sections:
# SEC-DEFAULT-NEXT: Idx Name Size Address Type
# SEC-DEFAULT-NEXT: 0 00000000 0000000000000000
# SEC-DEFAULT-NEXT: 1 .text 00000008 0000000000011000 TEXT DATA
# SEC-DEFAULT-NEXT: 2 .abcd 00000004 0000000000011008 TEXT DATA
# SEC-DEFAULT-NEXT: 3 .ad 00000004 000000000001100c TEXT DATA
# SEC-DEFAULT-NEXT: 4 .ag 00000004 0000000000011010 TEXT DATA
# SEC-DEFAULT-NEXT: 5 .symtab 00000030 0000000000000000
# SEC-DEFAULT-NEXT: 6 .shstrtab 0000002f 0000000000000000
# SEC-DEFAULT-NEXT: 7 .strtab 00000008 0000000000000000
## Now replace the symbol with '?' and check that results are the same.
# RUN: echo "SECTIONS { \
# RUN: .text : { *(.abc .ab?) } }" > %t.script
# RUN: ld.lld -o %t.out --script %t.script %t
# RUN: llvm-objdump -section-headers %t.out | \
# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
## Now see how replacing '?' with '*' will consume whole abcd.
# RUN: echo "SECTIONS { \
# RUN: .text : { *(.abc .ab*) } }" > %t.script
# RUN: ld.lld -o %t.out --script %t.script %t
# RUN: llvm-objdump -section-headers %t.out | \
# RUN: FileCheck -check-prefix=SEC-ALL %s
# SEC-ALL: Sections:
# SEC-ALL-NEXT: Idx Name Size Address Type
# SEC-ALL-NEXT: 0 00000000 0000000000000000
# SEC-ALL-NEXT: 1 .text 0000000c 0000000000011000 TEXT DATA
# SEC-ALL-NEXT: 2 .ad 00000004 000000000001100c TEXT DATA
# SEC-ALL-NEXT: 3 .ag 00000004 0000000000011010 TEXT DATA
# SEC-ALL-NEXT: 4 .symtab 00000030 0000000000000000
# SEC-ALL-NEXT: 5 .shstrtab 00000029 0000000000000000
# SEC-ALL-NEXT: 6 .strtab 00000008 0000000000000000
## All sections started with .a are merged.
# RUN: echo "SECTIONS { \
# RUN: .text : { *(.a*) } }" > %t.script
# RUN: ld.lld -o %t.out --script %t.script %t
# RUN: llvm-objdump -section-headers %t.out | \
# RUN: FileCheck -check-prefix=SEC-NO %s
# SEC-NO: Sections:
# SEC-NO-NEXT: Idx Name Size Address Type
# SEC-NO-NEXT: 0 00000000 0000000000000000
# SEC-NO-NEXT: 1 .text 00000014 0000000000011000 TEXT DATA
# SEC-NO-NEXT: 2 .symtab 00000030 0000000000000000
# SEC-NO-NEXT: 3 .shstrtab 00000021 0000000000000000
# SEC-NO-NEXT: 4 .strtab 00000008 0000000000000000
.text
.section .abc,"ax",@progbits
.long 0
.text
.section .abx,"ax",@progbits
.long 0
.text
.section .abcd,"ax",@progbits
.long 0
.text
.section .ad,"ax",@progbits
.long 0
.text
.section .ag,"ax",@progbits
.long 0
.globl _start
_start: