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[llvm-readelf] - Do not error out when dumping symbols.
When the --symbols option/--dyn-symbols is given we might report an error and exit when something goes not right. E.g. when the SHT_SYMTAB section is broken. Though we could report a warning and try to continue dumping instead in many cases. This patch removes `unwrapOrErr` calls from the code involved in the flow described. Differential revision: https://reviews.llvm.org/D82955
This commit is contained in:
Georgii Rymar
parent
9e782e3923
commit
73e2acf290
@ -115,9 +115,9 @@ Symbols:
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## Check that llvm-readobj reports an error if .symtab has an invalid sh_entsize.
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# RUN: yaml2obj %s --docnum=6 -o %t6
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# RUN: not llvm-readobj --symbols %t6 2>&1 | FileCheck -DFILE=%t6 --check-prefix=INVALID-SYM-SIZE %s
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# RUN: llvm-readobj --symbols %t6 2>&1 | FileCheck -DFILE=%t6 --check-prefix=INVALID-SYM-SIZE %s
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# INVALID-SYM-SIZE: error: '[[FILE]]': section [index 1] has an invalid sh_entsize: 32
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# INVALID-SYM-SIZE: warning: '[[FILE]]': unable to read symbols from the SHT_SYMTAB section: section [index 1] has an invalid sh_entsize: 32
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--- !ELF
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FileHeader:
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@ -152,13 +152,13 @@ Sections:
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DynamicSymbols:
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- Name: foo
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## Check that llvm-readobj reports an error if .symtab has an invalid sh_link value,
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## Check that llvm-readobj reports a warning if .symtab has an invalid sh_link value,
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## which is greater than number of sections.
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# RUN: yaml2obj %s --docnum=8 -o %t8
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# RUN: not llvm-readobj --symbols %t8 2>&1 | FileCheck -DFILE=%t8 --check-prefix=INVALID-SYMTAB-LINK %s
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# RUN: llvm-readobj --symbols %t8 2>&1 | FileCheck -DFILE=%t8 --check-prefix=INVALID-SYMTAB-LINK %s
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# INVALID-SYMTAB-LINK: error: '[[FILE]]': invalid section index: 255
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# INVALID-SYMTAB-LINK: warning: '[[FILE]]': unable to get the string table for the SHT_SYMTAB section: invalid section index: 255
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--- !ELF
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FileHeader:
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@ -187,13 +187,13 @@ FileHeader:
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Machine: EM_X86_64
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SHEntSize: 1
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## Check that llvm-readobj reports an error if .symtab has sh_size
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## Check that llvm-readobj reports a warning if .symtab has sh_size
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## that is not a multiple of sh_entsize.
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# RUN: yaml2obj %s --docnum=10 -o %t10
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# RUN: not llvm-readobj --symbols %t10 2>&1 | FileCheck -DFILE=%t10 --check-prefix=INVALID-SYMTAB-SIZE %s
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# RUN: llvm-readobj --symbols %t10 2>&1 | FileCheck -DFILE=%t10 --check-prefix=INVALID-SYMTAB-SIZE %s
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# INVALID-SYMTAB-SIZE: error: '[[FILE]]': section [index 1] has an invalid sh_size (1) which is not a multiple of its sh_entsize (24)
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# INVALID-SYMTAB-SIZE: warning: '[[FILE]]': unable to read symbols from the SHT_SYMTAB section: section [index 1] has an invalid sh_size (1) which is not a multiple of its sh_entsize (24)
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--- !ELF
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FileHeader:
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@ -276,13 +276,13 @@ Sections:
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Type: SHT_RELA
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ShOffset: 0x10000
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## Check that llvm-objdump reports an error when we try to print symbols and
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## Check that llvm-objdump reports a warning when we try to print symbols and
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## .shstrtab has a broken sh_offset so large that sh_offset + sh_size overflows the platform address size type.
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# RUN: yaml2obj %s --docnum=14 -o %t14
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# RUN: not llvm-readobj --symbols %t14 2>&1 | FileCheck -DFILE=%t14 --check-prefix=INVALID-SECTION-SIZE2 %s
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# RUN: llvm-readobj --symbols %t14 2>&1 | FileCheck -DFILE=%t14 --check-prefix=INVALID-SECTION-SIZE2 %s
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# INVALID-SECTION-SIZE2: error: '[[FILE]]': section [index 1] has a sh_offset (0xffffffff) + sh_size (0x1b) that cannot be represented
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# INVALID-SECTION-SIZE2: warning: '[[FILE]]': unable to get the name of the SHT_SYMTAB section: section [index 1] has a sh_offset (0xffffffff) + sh_size (0x1b) that cannot be represented
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--- !ELF
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FileHeader:
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@ -364,13 +364,13 @@ Sections:
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Type: SHT_PROGBITS
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ShOffset: 0xFFFF0000
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## Check that llvm-readobj reports an error if symbol name
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## Check that llvm-readobj reports a warning if symbol name
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## offset goes past the end of the symbol string table.
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# RUN: yaml2obj %s --docnum=18 -o %t18
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# RUN: not llvm-readobj --symbols %t18 2>&1 | FileCheck -DFILE=%t18 --check-prefix=INVALID-SYM-NAME %s
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# RUN: llvm-readobj --symbols %t18 2>&1 | FileCheck -DFILE=%t18 --check-prefix=INVALID-SYM-NAME %s
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# INVALID-SYM-NAME: error: '[[FILE]]': st_name (0x1) is past the end of the string table of size 0x1
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# INVALID-SYM-NAME: warning: '[[FILE]]': st_name (0x1) is past the end of the string table of size 0x1
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--- !ELF
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FileHeader:
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@ -434,9 +434,9 @@ Sections:
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## table goes past the end of the file. Document we stop dumping symbols and report an error.
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# RUN: yaml2obj %s --docnum=13 -o %t14
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# RUN: not llvm-readobj --dyn-symbols %t14 2>&1 | \
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# RUN: llvm-readobj --dyn-symbols %t14 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t14 --check-prefix=DYNSTR-INVALID-LLVM
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# RUN: not llvm-readelf --dyn-symbols %t14 2>&1 | \
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# RUN: llvm-readelf --dyn-symbols %t14 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t14 --check-prefix=DYNSTR-INVALID-GNU
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# DYNSTR-INVALID-LLVM: warning: '[[FILE]]': the dynamic string table at 0x78 goes past the end of the file (0x2a8) with DT_STRSZ = 0xffffffff
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@ -450,13 +450,34 @@ Sections:
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# DYNSTR-INVALID-LLVM-NEXT: Other: 0
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# DYNSTR-INVALID-LLVM-NEXT: Section: Undefined (0x0)
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# DYNSTR-INVALID-LLVM-NEXT: }
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# DYNSTR-INVALID-LLVM-NEXT: error: '[[FILE]]': st_name (0xffffff00) is past the end of the string table of size 0x6
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# DYNSTR-INVALID-LLVM-NEXT: warning: '[[FILE]]': st_name (0xffffff00) is past the end of the string table of size 0x6
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# DYNSTR-INVALID-LLVM-NEXT: Symbol {
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# DYNSTR-INVALID-LLVM-NEXT: Name: <?> (4294967040)
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# DYNSTR-INVALID-LLVM-NEXT: Value: 0x0
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# DYNSTR-INVALID-LLVM-NEXT: Size: 0
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# DYNSTR-INVALID-LLVM-NEXT: Binding: Local (0x0)
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# DYNSTR-INVALID-LLVM-NEXT: Type: None (0x0)
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# DYNSTR-INVALID-LLVM-NEXT: Other: 0
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# DYNSTR-INVALID-LLVM-NEXT: Section: Undefined (0x0)
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# DYNSTR-INVALID-LLVM-NEXT: }
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# DYNSTR-INVALID-LLVM-NEXT: Symbol {
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# DYNSTR-INVALID-LLVM-NEXT: Name: test (1)
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# DYNSTR-INVALID-LLVM-NEXT: Value: 0x0
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# DYNSTR-INVALID-LLVM-NEXT: Size: 0
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# DYNSTR-INVALID-LLVM-NEXT: Binding: Local (0x0)
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# DYNSTR-INVALID-LLVM-NEXT: Type: None (0x0)
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# DYNSTR-INVALID-LLVM-NEXT: Other: 0
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# DYNSTR-INVALID-LLVM-NEXT: Section: Undefined (0x0)
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# DYNSTR-INVALID-LLVM-NEXT: }
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# DYNSTR-INVALID-LLVM-NEXT: ]
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# DYNSTR-INVALID-GNU: warning: '[[FILE]]': the dynamic string table at 0x78 goes past the end of the file (0x2a8) with DT_STRSZ = 0xffffffff
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# DYNSTR-INVALID-GNU: Symbol table '.dynsym' contains 3 entries:
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# DYNSTR-INVALID-GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
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# DYNSTR-INVALID-GNU-NEXT: 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
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# DYNSTR-INVALID-GNU-NEXT: error: '[[FILE]]': st_name (0xffffff00) is past the end of the string table of size 0x6
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# DYNSTR-INVALID-GNU-NEXT: warning: '[[FILE]]': st_name (0xffffff00) is past the end of the string table of size 0x6
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# DYNSTR-INVALID-GNU-NEXT: 1: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND <?>
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# DYNSTR-INVALID-GNU-NEXT: 2: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND test
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--- !ELF
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FileHeader:
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@ -116,3 +116,118 @@ Symbols:
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Value: 0x2
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DynamicSymbols:
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- Name: zed
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## Check the behavior when we are unable to print symbols due to an error.
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## Case 1: check we are able to dump symbols even when can't get the string table for the
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## SHT_SYMTAB section because of invalid sh_link value.
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# RUN: yaml2obj --docnum=2 -DLINK=0xff %s -o %t64.err1
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# RUN: llvm-readobj --symbols %t64.err1 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t64.err1 --check-prefix=STRTAB-LINK-ERR-LLVM
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# RUN: llvm-readelf --symbols %t64.err1 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t64.err1 --check-prefix=STRTAB-LINK-ERR-GNU
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# STRTAB-LINK-ERR-LLVM: Symbols [
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# STRTAB-LINK-ERR-LLVM-NEXT: warning: '[[FILE]]': unable to get the string table for the SHT_SYMTAB section: invalid section index: 255
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# STRTAB-LINK-ERR-LLVM-NEXT: warning: '[[FILE]]': st_name (0x0) is past the end of the string table of size 0x0
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# STRTAB-LINK-ERR-LLVM-NEXT: Symbol {
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# STRTAB-LINK-ERR-LLVM-NEXT: Name: <?> (0)
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# STRTAB-LINK-ERR-LLVM-NEXT: Value: 0x0
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# STRTAB-LINK-ERR-LLVM-NEXT: Size: 0
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# STRTAB-LINK-ERR-LLVM-NEXT: Binding: Local (0x0)
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# STRTAB-LINK-ERR-LLVM-NEXT: Type: None (0x0)
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# STRTAB-LINK-ERR-LLVM-NEXT: Other: 0
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# STRTAB-LINK-ERR-LLVM-NEXT: Section: Undefined (0x0)
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# STRTAB-LINK-ERR-LLVM-NEXT: }
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# STRTAB-LINK-ERR-LLVM-NEXT: warning: '[[FILE]]': st_name (0x1) is past the end of the string table of size 0x0
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# STRTAB-LINK-ERR-LLVM-NEXT: Symbol {
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# STRTAB-LINK-ERR-LLVM-NEXT: Name: <?> (1)
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# STRTAB-LINK-ERR-LLVM-NEXT: Value: 0x1
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# STRTAB-LINK-ERR-LLVM-NEXT: Size: 0
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# STRTAB-LINK-ERR-LLVM-NEXT: Binding: Global (0x1)
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# STRTAB-LINK-ERR-LLVM-NEXT: Type: None (0x0)
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# STRTAB-LINK-ERR-LLVM-NEXT: Other: 0
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# STRTAB-LINK-ERR-LLVM-NEXT: Section: .symtab (0x1)
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# STRTAB-LINK-ERR-LLVM-NEXT: }
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# STRTAB-LINK-ERR-LLVM-NEXT: ]
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# STRTAB-LINK-ERR-GNU: warning: '[[FILE]]': unable to get the string table for the SHT_SYMTAB section: invalid section index: 255
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# STRTAB-LINK-ERR-GNU: Symbol table '.symtab' contains 2 entries:
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# STRTAB-LINK-ERR-GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
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# STRTAB-LINK-ERR-GNU-NEXT: warning: '[[FILE]]': st_name (0x0) is past the end of the string table of size 0x0
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# STRTAB-LINK-ERR-GNU-NEXT: 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND <?>
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# STRTAB-LINK-ERR-GNU-NEXT: warning: '[[FILE]]': st_name (0x1) is past the end of the string table of size 0x0
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# STRTAB-LINK-ERR-GNU-NEXT: 1: 0000000000000001 0 NOTYPE GLOBAL DEFAULT 1 <?>
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_X86_64
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SHStrNdx: [[SHSTRTAB=2]]
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Sections:
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- Name: .symtab
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Type: SHT_SYMTAB
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Link: [[LINK=.strtab]]
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EntSize: [[ENTSIZE=0x18]]
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## Define the .shstrtab section to reveal its position.
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- Name: .shstrtab
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Type: SHT_STRTAB
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Symbols:
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- Name: foo
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Value: 0x1
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Binding: STB_GLOBAL
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Index: 1
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## Case 2: check we report a warning when we are unable to read symbols
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## from the the SHT_SYMTAB section.
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# RUN: yaml2obj --docnum=2 -DENTSIZE=0xFF %s -o %t64.err2
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# RUN: llvm-readobj --symbols %t64.err2 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t64.err2 --check-prefix=SYMTAB-ENTSIZE-ERR-LLVM
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# RUN: llvm-readelf --symbols %t64.err2 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t64.err2 --check-prefix=SYMTAB-ENTSIZE-ERR-GNU
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# SYMTAB-ENTSIZE-ERR-LLVM: Symbols [
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# SYMTAB-ENTSIZE-ERR-LLVM-NEXT: warning: '[[FILE]]': unable to read symbols from the SHT_SYMTAB section: section [index 1] has an invalid sh_entsize: 255
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# SYMTAB-ENTSIZE-ERR-LLVM: ]
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# SYMTAB-ENTSIZE-ERR-GNU: warning: '[[FILE]]': unable to read symbols from the SHT_SYMTAB section: section [index 1] has an invalid sh_entsize: 255
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# SYMTAB-ENTSIZE-ERR-GNU-NOT: {{.}}
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## Case 3: check we report a warning, but continue dumping, when we are unable to read the name of the SHT_SYMTAB section.
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## In this case we set the e_shstrndx field to an invalid index so that the .shstrtab section can't be located.
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# RUN: yaml2obj --docnum=2 -DSHSTRTAB=0xff %s -o %t64.err3
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# RUN: llvm-readobj --symbols %t64.err3 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t64.err3 --check-prefix=SYMTAB-SHSTRTAB-ERR-LLVM
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# RUN: llvm-readelf --symbols %t64.err3 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t64.err3 --check-prefix=SYMTAB-SHSTRTAB-ERR-GNU
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# SYMTAB-SHSTRTAB-ERR-LLVM: Symbols [
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: warning: '[[FILE]]': unable to get the name of the SHT_SYMTAB section: section header string table index 255 does not exist
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Symbol {
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Name: (0)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Value: 0x0
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Size: 0
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Binding: Local (0x0)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Type: None (0x0)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Other: 0
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Section: Undefined (0x0)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: }
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Symbol {
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Name: foo (1)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Value: 0x1
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Size: 0
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Binding: Global (0x1)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Type: None (0x0)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Other: 0
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: warning: '[[FILE]]': section header string table index 255 does not exist
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: Section: <?> (0x1)
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: }
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# SYMTAB-SHSTRTAB-ERR-LLVM-NEXT: ]
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# SYMTAB-SHSTRTAB-ERR-GNU: warning: '[[FILE]]': unable to get the name of the SHT_SYMTAB section: section header string table index 255 does not exist
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# SYMTAB-SHSTRTAB-ERR-GNU: Symbol table '<?>' contains 2 entries:
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# SYMTAB-SHSTRTAB-ERR-GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
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# SYMTAB-SHSTRTAB-ERR-GNU-NEXT: 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
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# SYMTAB-SHSTRTAB-ERR-GNU-NEXT: 1: 0000000000000001 0 NOTYPE GLOBAL DEFAULT 1 foo
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@ -682,11 +682,32 @@ void ELFDumper<ELFT>::printSymbolsHelper(bool IsDynamic) const {
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} else {
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if (!DotSymtabSec)
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return;
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StrTable = unwrapOrError(ObjF->getFileName(),
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Obj->getStringTableForSymtab(*DotSymtabSec));
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Syms = unwrapOrError(ObjF->getFileName(), Obj->symbols(DotSymtabSec));
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SymtabName =
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unwrapOrError(ObjF->getFileName(), Obj->getSectionName(DotSymtabSec));
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if (Expected<StringRef> StrTableOrErr =
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Obj->getStringTableForSymtab(*DotSymtabSec))
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StrTable = *StrTableOrErr;
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else
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reportUniqueWarning(createError(
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"unable to get the string table for the SHT_SYMTAB section: " +
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toString(StrTableOrErr.takeError())));
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if (Expected<Elf_Sym_Range> SymsOrErr = Obj->symbols(DotSymtabSec))
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Syms = *SymsOrErr;
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else
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reportUniqueWarning(
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createError("unable to read symbols from the SHT_SYMTAB section: " +
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toString(SymsOrErr.takeError())));
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if (Expected<StringRef> SymtabNameOrErr =
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Obj->getSectionName(DotSymtabSec)) {
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SymtabName = *SymtabNameOrErr;
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} else {
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reportUniqueWarning(
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createError("unable to get the name of the SHT_SYMTAB section: " +
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toString(SymtabNameOrErr.takeError())));
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SymtabName = "<?>";
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}
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Entries = DotSymtabSec->getEntityCount();
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}
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if (Syms.begin() == Syms.end())
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@ -1156,8 +1177,13 @@ template <typename ELFT>
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std::string ELFDumper<ELFT>::getFullSymbolName(const Elf_Sym *Symbol,
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StringRef StrTable,
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bool IsDynamic) const {
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std::string SymbolName = maybeDemangle(
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unwrapOrError(ObjF->getFileName(), Symbol->getName(StrTable)));
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std::string SymbolName;
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if (Expected<StringRef> NameOrErr = Symbol->getName(StrTable)) {
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SymbolName = maybeDemangle(*NameOrErr);
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} else {
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reportUniqueWarning(NameOrErr.takeError());
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return "<?>";
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}
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if (SymbolName.empty() && Symbol->getType() == ELF::STT_SECTION) {
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Elf_Sym_Range Syms = unwrapOrError(
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