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[ELF] - Implemented linkerscript ALIGN command 

ALIGN(exp)
Return the location counter (.) aligned to the next exp boundary. (https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/html/Using_ld_the_GNU_Linker/expressions.html)

Patch implements this command.
This fixes PR27406.

Differential revision: http://reviews.llvm.org/D19364

llvm-svn: 267145
This commit is contained in:
George Rimar 2016-04-22 11:40:53 +00:00
parent b1bfd5039e
commit dffc1410c5
2 changed files with 49 additions and 0 deletions
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8
lld/ELF/LinkerScript.cpp
View File

@ -94,6 +94,14 @@ uint64_t LinkerScript<ELFT>::parsePrimary(ArrayRef<StringRef> &Tokens) {
return 0;
return V;
}
if (Tok == "ALIGN") {
if (!expect(Tokens, "("))
return 0;
uint64_t V = parseExpr(Tokens);
if (!expect(Tokens, ")"))
return 0;
return alignTo(Dot, V);
}
return getInteger(Tok);
}

41
lld/test/ELF/linkerscript-align.s Normal file
View File

@ -0,0 +1,41 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
# RUN: echo "SECTIONS { \
# RUN: . = 0x10000; \
# RUN: .aaa : \
# RUN: { \
# RUN: *(.aaa) \
# RUN: } \
# RUN: . = ALIGN(4096); \
# RUN: .bbb : \
# RUN: { \
# RUN: *(.bbb) \
# RUN: } \
# RUN: . = ALIGN(4096 * 4); \
# RUN: .ccc : \
# RUN: { \
# RUN: *(.ccc) \
# RUN: } \
# RUN: }" > %t.script
# RUN: ld.lld -o %t1 --script %t.script %t
# RUN: llvm-objdump -section-headers %t1 | FileCheck %s
# CHECK: Sections:
# CHECK-NEXT: Idx Name Size Address Type
# CHECK-NEXT: 0 00000000 0000000000000000
# CHECK-NEXT: 1 .aaa 00000008 0000000000010000 DATA
# CHECK-NEXT: 2 .bbb 00000008 0000000000011000 DATA
# CHECK-NEXT: 3 .ccc 00000008 0000000000014000 DATA
.global _start
_start:
nop
.section .aaa, "a"
.quad 0
.section .bbb, "a"
.quad 0
.section .ccc, "a"
.quad 0