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llvm-project/lld/test/core/undef-weak-coalesce.objtxt

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Delete unnecessary generality in loadFile. loadFile could load mulitple files just because yaml has a feature for putting multiple documents in one file. Designing a linker around what yaml can do seems like a bad idea to me. This patch changes it to read a single file. There are further improvements to be done to the api and they will follow shortly. llvm-svn: 235724
2015-04-24 23:51:45 +08:00
# RUN: lld -core %s %p/Inputs/undef-weak-coalesce.objtxt| FileCheck %s
Add support for SharedLibraryAtoms (proxy atoms for exported symbols from a shared library) and AbsoluteAtoms (proxy atoms for absolute address (e.g. ROM)). Redesign weak importing as can-be-null-at-runtime and can-be-null-at-build-time. Add lots of test cases for all the above. llvm-svn: 151204
2012-02-23 05:56:59 +08:00
#
# Test that undefined symbols preserve their attributes and merge properly
#
---
Removes files for separate ReaderYAML.cpp and WriterYAML.cpp and adds a new file ReaderWriterYAML.cpp that uses YAML I/O. Lots of tweaks to test suite for slightly different YAML encoding. llvm-svn: 171592
2013-01-05 10:22:35 +08:00
undefined-atoms:
Add support for SharedLibraryAtoms (proxy atoms for exported symbols from a shared library) and AbsoluteAtoms (proxy atoms for absolute address (e.g. ROM)). Redesign weak importing as can-be-null-at-runtime and can-be-null-at-build-time. Add lots of test cases for all the above. llvm-svn: 151204
2012-02-23 05:56:59 +08:00
- name: regular_func
can-be-null: never
- name: weak_import_func
can-be-null: at-runtime
- name: weak_func
can-be-null: at-buildtime
- name: bar1
can-be-null: never
- name: bar2
can-be-null: at-runtime
- name: bar3
can-be-null: at-buildtime
- name: bar4
can-be-null: never
- name: bar5
can-be-null: at-runtime
- name: bar6
can-be-null: at-buildtime
- name: bar7
can-be-null: never
- name: bar8
can-be-null: at-runtime
- name: bar9
can-be-null: at-buildtime
...
Select new undefined atom rather than old one if other conditions are the same. We can add multiple undefined atoms having the same name to the symbol table. If such atoms are added, the symbol table compares their canBeNull attributes, and select one having a stronger constraint. If their canBeNulls are the same, the choice is arbitrary. Currently it choose the existing one. This patch changes the preference, so that the symbol table choose the new one if the new atom has a greater canBeNull or a fallback atom. This shouldn't change the behavior except the case described below. A new undefined atom may have a new fallback atom attribute. By choosing the new atom, we can update the fallback atom during Core Linking. PE/COFF actually need that. For example, _lseek is an alias for __lseek on Windows. One of an object file in OLDNAMES.LIB has an undefined atom for _lseek with the fallback to __lseek. When the linker tries to resolve _read, it supposed to read the file from OLDNAMES.LIB and use the new fallback from the file. Currently LLD cannot handle such case because duplicate undefined atoms with the same attributes are ignored. Differential Revision: http://llvm-reviews.chandlerc.com/D2161 llvm-svn: 194777
2013-11-15 11:12:24 +08:00
# CHECK: - name: regular_func
# CHECK-NEXT: - name: weak_import_func
# CHECK-NEXT: can-be-null: at-runtime
# CHECK-NEXT: - name: weak_func
# CHECK-NEXT: can-be-null: at-buildtime
# CHECK-NEXT: - name: bar1
# CHECK-NEXT: - name: bar2
# CHECK-NEXT: can-be-null: at-runtime
# CHECK-NEXT: - name: bar3
# CHECK-NEXT: can-be-null: at-buildtime
# CHECK-NEXT: - name: bar4
# CHECK-NEXT: - name: bar5
# CHECK-NEXT: can-be-null: at-runtime
# CHECK-NEXT: - name: bar7
# CHECK-NEXT: - name: bar6
# CHECK-NEXT: - name: bar8
# CHECK-NEXT: - name: bar9
# CHECK-NEXT: can-be-null: at-runtime