maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/lld/test/elf/defsym.objtxt

29 lines
968 B
Plaintext
Raw Normal View History

[ELF] Support --defsym option to define an absolute symbol. This patch is to support --defsym option for ELF file format/GNU-compatible driver. Currently it takes a symbol name followed by '=' and a number. If such option is given, the driver sets up an absolute symbol with the specified address. You can specify multiple --defsym options to define multiple symbols. GNU LD's --defsym provides many more features. For example, it allows users to specify another symbol name instead of a number to define a symbol alias, or it even allows a symbol plus an offset (e.g. --defsym=foo+3) to define symbol- relative alias. This patch does not support that, but will be supported in subsequent patches. Differential Revision: http://llvm-reviews.chandlerc.com/D3208 llvm-svn: 205029
2014-03-29 03:02:06 +08:00
# RUN: lld -flavor gnu -target x86_64 --defsym=foo=0x1234 -r %s \
[ELF] Support --defsym=<symbol>=<symbol>. Currently LLD supports --defsym only in the form of --defsym=<symbol>=<integer>, where the integer is interpreted as the absolute address of the symbol. This patch extends it to allow other symbol name to be given as an RHS value. If a RHS value is a symbol name, the LHS symbol will be defined as an alias for the RHS symbol. Internally, a LHS symbol is represented as a zero-size defined atom who has an LayoutAfter reference to an undefined atom, whose name is the RHS value. Everything else is already implemented -- Resolver will resolve the undefined symbol, and the layout pass will layout the two atoms at the same location. Looks like it's working fine. Note that GNU LD supports --defsym=<symbol>=<symbol>+<addend>. That feature is out of scope of this patch. Differential Revision: http://reviews.llvm.org/D3332 llvm-svn: 206417
2014-04-17 04:58:57 +08:00
# RUN: --output-filetype=yaml | FileCheck -check-prefix=ABS %s
[ELF] Support --defsym option to define an absolute symbol. This patch is to support --defsym option for ELF file format/GNU-compatible driver. Currently it takes a symbol name followed by '=' and a number. If such option is given, the driver sets up an absolute symbol with the specified address. You can specify multiple --defsym options to define multiple symbols. GNU LD's --defsym provides many more features. For example, it allows users to specify another symbol name instead of a number to define a symbol alias, or it even allows a symbol plus an offset (e.g. --defsym=foo+3) to define symbol- relative alias. This patch does not support that, but will be supported in subsequent patches. Differential Revision: http://llvm-reviews.chandlerc.com/D3208 llvm-svn: 205029
2014-03-29 03:02:06 +08:00
[ELF] Support --defsym=<symbol>=<symbol>. Currently LLD supports --defsym only in the form of --defsym=<symbol>=<integer>, where the integer is interpreted as the absolute address of the symbol. This patch extends it to allow other symbol name to be given as an RHS value. If a RHS value is a symbol name, the LHS symbol will be defined as an alias for the RHS symbol. Internally, a LHS symbol is represented as a zero-size defined atom who has an LayoutAfter reference to an undefined atom, whose name is the RHS value. Everything else is already implemented -- Resolver will resolve the undefined symbol, and the layout pass will layout the two atoms at the same location. Looks like it's working fine. Note that GNU LD supports --defsym=<symbol>=<symbol>+<addend>. That feature is out of scope of this patch. Differential Revision: http://reviews.llvm.org/D3332 llvm-svn: 206417
2014-04-17 04:58:57 +08:00
# RUN: lld -flavor gnu -target x86_64 --defsym=foo=main -r %s \
# RUN: --output-filetype=yaml | FileCheck -check-prefix=ALIAS %s
[ELF] Support --defsym option to define an absolute symbol. This patch is to support --defsym option for ELF file format/GNU-compatible driver. Currently it takes a symbol name followed by '=' and a number. If such option is given, the driver sets up an absolute symbol with the specified address. You can specify multiple --defsym options to define multiple symbols. GNU LD's --defsym provides many more features. For example, it allows users to specify another symbol name instead of a number to define a symbol alias, or it even allows a symbol plus an offset (e.g. --defsym=foo+3) to define symbol- relative alias. This patch does not support that, but will be supported in subsequent patches. Differential Revision: http://llvm-reviews.chandlerc.com/D3208 llvm-svn: 205029
2014-03-29 03:02:06 +08:00
[ELF] Support --defsym=<symbol>=<symbol>. Currently LLD supports --defsym only in the form of --defsym=<symbol>=<integer>, where the integer is interpreted as the absolute address of the symbol. This patch extends it to allow other symbol name to be given as an RHS value. If a RHS value is a symbol name, the LHS symbol will be defined as an alias for the RHS symbol. Internally, a LHS symbol is represented as a zero-size defined atom who has an LayoutAfter reference to an undefined atom, whose name is the RHS value. Everything else is already implemented -- Resolver will resolve the undefined symbol, and the layout pass will layout the two atoms at the same location. Looks like it's working fine. Note that GNU LD supports --defsym=<symbol>=<symbol>+<addend>. That feature is out of scope of this patch. Differential Revision: http://reviews.llvm.org/D3332 llvm-svn: 206417
2014-04-17 04:58:57 +08:00
defined-atoms:
- name: main
scope: global
content: [ B8, 00, 00, 00, 00, C7, 44, 24, FC, 00, 00, 00, 00, C3 ]
YAML: Do not use 2^x notation to represent alignments. llvm-svn: 233222
2015-03-26 06:06:04 +08:00
alignment: 16
[ELF] Support --defsym=<symbol>=<symbol>. Currently LLD supports --defsym only in the form of --defsym=<symbol>=<integer>, where the integer is interpreted as the absolute address of the symbol. This patch extends it to allow other symbol name to be given as an RHS value. If a RHS value is a symbol name, the LHS symbol will be defined as an alias for the RHS symbol. Internally, a LHS symbol is represented as a zero-size defined atom who has an LayoutAfter reference to an undefined atom, whose name is the RHS value. Everything else is already implemented -- Resolver will resolve the undefined symbol, and the layout pass will layout the two atoms at the same location. Looks like it's working fine. Note that GNU LD supports --defsym=<symbol>=<symbol>+<addend>. That feature is out of scope of this patch. Differential Revision: http://reviews.llvm.org/D3332 llvm-svn: 206417
2014-04-17 04:58:57 +08:00
section-choice: custom-required
section-name: .text
# ABS: absolute-atoms:
# ABS: - name: foo
# ABS: scope: global
# ABS: value: 0x0000000000001234
# ALIAS: defined-atoms:
# ALIAS: - name: foo
# ALIAS: scope: global
# ALIAS: section-choice: custom-required
# ALIAS: section-name: .text
# ALIAS: references:
# ALIAS: - kind: layout-after
# ALIAS: offset: 0
# ALIAS: target: main