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amykhuangamykhuang
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Deduplicate S_CONSTANTs in LLD.
Summary: Deduplicate S_CONSTANTS when linking, if they have the same value. Reviewers: rnk Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D63151 llvm-svn: 363089
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‎lld/test/COFF/Inputs/pdb-global-constants-a.s

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.text
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.def @feat.00;
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.scl 3;
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.type 0;
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.endef
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.globl @feat.00
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.set @feat.00, 0
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.file "t.cpp"
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.def main;
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.scl 2;
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.type 32;
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.endef
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.globl main # -- Begin function main
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.p2align 4, 0x90
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main: # @main
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.Lfunc_begin0:
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.cv_func_id 0
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.cv_file 1 "C:\\src\\testing\\t.cpp" "D28AB0CC784E17E5DF9BBB49CB629C81" 1
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.cv_loc 0 1 4 0 # t.cpp:4:0
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.seh_proc main
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# %bb.0: # %entry
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pushq %rax
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.seh_stackalloc 8
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.seh_endprologue
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movl $0, 4(%rsp)
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.Ltmp0:
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movl $83, %eax
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popq %rcx
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retq
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.Ltmp1:
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.Lfunc_end0:
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.seh_handlerdata
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.text
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.seh_endproc
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# -- End function
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.section .debug$S,"dr"
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.p2align 2
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.long 4 # Debug section magic
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.long 241
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.long .Ltmp3-.Ltmp2 # Subsection size
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.Ltmp2:
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.short .Ltmp5-.Ltmp4 # Record length
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.Ltmp4:
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.short 4412 # Record kind: S_COMPILE3
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.long 1 # Flags and language
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.short 208 # CPUType
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.short 9 # Frontend version
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.short 0
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.short 0
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.short 0
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.short 9000 # Backend version
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.short 0
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.short 0
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.short 0
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.asciz "clang version 9.0.0 (https://github.com/llvm/llvm-project.git ad522e17b285b1f2667163d52da5abf0968ec650)" # Null-terminated compiler version string
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.p2align 2
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.Ltmp5:
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.Ltmp3:
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.p2align 2
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.long 241 # Symbol subsection for main
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.long .Ltmp7-.Ltmp6 # Subsection size
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.Ltmp6:
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.short .Ltmp9-.Ltmp8 # Record length
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.Ltmp8:
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.short 4423 # Record kind: S_GPROC32_ID
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.long 0 # PtrParent
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.long 0 # PtrEnd
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.long 0 # PtrNext
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.long .Lfunc_end0-main # Code size
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.long 0 # Offset after prologue
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.long 0 # Offset before epilogue
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.long 4098 # Function type index
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.secrel32 main # Function section relative address
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.secidx main # Function section index
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.byte 0 # Flags
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.asciz "main" # Function name
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.p2align 2
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.Ltmp9:
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.short .Ltmp11-.Ltmp10 # Record length
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.Ltmp10:
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.short 4114 # Record kind: S_FRAMEPROC
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.long 8 # FrameSize
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.long 0 # Padding
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.long 0 # Offset of padding
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.long 0 # Bytes of callee saved registers
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.long 0 # Exception handler offset
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.short 0 # Exception handler section
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.long 81920 # Flags (defines frame register)
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.p2align 2
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.Ltmp11:
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.short 2 # Record length
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.short 4431 # Record kind: S_PROC_ID_END
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.Ltmp7:
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.p2align 2
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.cv_linetable 0, main, .Lfunc_end0
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.long 241 # Symbol subsection for globals
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.long .Ltmp13-.Ltmp12 # Subsection size
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.Ltmp12:
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.short .Ltmp15-.Ltmp14 # Record length
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.Ltmp14:
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.short 4359 # Record kind: S_CONSTANT
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.long 4099 # Type
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.byte 0x29, 0x00 # Value
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.asciz "Foo" # Name
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.p2align 2
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.Ltmp15:
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.short .Ltmp17-.Ltmp16 # Record length
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.Ltmp16:
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.short 4359 # Record kind: S_CONSTANT
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.long 4099 # Type
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.byte 0x2a, 0x00 # Value
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.asciz "Bar" # Name
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.p2align 2
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.Ltmp17:
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.Ltmp13:
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.p2align 2
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.cv_filechecksums # File index to string table offset subsection
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.cv_stringtable # String table
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.long 241
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.long .Ltmp19-.Ltmp18 # Subsection size
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.Ltmp18:
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.short .Ltmp21-.Ltmp20 # Record length
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.Ltmp20:
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.short 4428 # Record kind: S_BUILDINFO
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.long 4102 # LF_BUILDINFO index
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.p2align 2
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.Ltmp21:
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.Ltmp19:
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.p2align 2
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.section .debug$T,"dr"
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.p2align 2
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.long 4 # Debug section magic
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# ArgList (0x1000) {
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# TypeLeafKind: LF_ARGLIST (0x1201)
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# NumArgs: 0
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# Arguments [
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# ]
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# }
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.byte 0x06, 0x00, 0x01, 0x12
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.byte 0x00, 0x00, 0x00, 0x00
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# Procedure (0x1001) {
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# TypeLeafKind: LF_PROCEDURE (0x1008)
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# ReturnType: int (0x74)
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# CallingConvention: NearC (0x0)
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# FunctionOptions [ (0x0)
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# ]
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# NumParameters: 0
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# ArgListType: () (0x1000)
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# }
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.byte 0x0e, 0x00, 0x08, 0x10
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.byte 0x74, 0x00, 0x00, 0x00
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.byte 0x00, 0x00, 0x00, 0x00
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.byte 0x00, 0x10, 0x00, 0x00
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# FuncId (0x1002) {
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# TypeLeafKind: LF_FUNC_ID (0x1601)
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# ParentScope: 0x0
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# FunctionType: int () (0x1001)
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# Name: main
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# }
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.byte 0x12, 0x00, 0x01, 0x16
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.byte 0x00, 0x00, 0x00, 0x00
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.byte 0x01, 0x10, 0x00, 0x00
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.byte 0x6d, 0x61, 0x69, 0x6e
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.byte 0x00, 0xf3, 0xf2, 0xf1
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# Modifier (0x1003) {
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# TypeLeafKind: LF_MODIFIER (0x1001)
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# ModifiedType: int (0x74)
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# Modifiers [ (0x1)
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# Const (0x1)
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# ]
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# }
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.byte 0x0a, 0x00, 0x01, 0x10
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.byte 0x74, 0x00, 0x00, 0x00
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.byte 0x01, 0x00, 0xf2, 0xf1
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# StringId (0x1004) {
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# TypeLeafKind: LF_STRING_ID (0x1605)
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# Id: 0x0
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# StringData: C:\src\testing
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# }
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.byte 0x16, 0x00, 0x05, 0x16
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.byte 0x00, 0x00, 0x00, 0x00
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.byte 0x43, 0x3a, 0x5c, 0x73
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.byte 0x72, 0x63, 0x5c, 0x74
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.byte 0x65, 0x73, 0x74, 0x69
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.byte 0x6e, 0x67, 0x00, 0xf1
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# StringId (0x1005) {
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# TypeLeafKind: LF_STRING_ID (0x1605)
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# Id: 0x0
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# StringData: t.cpp
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# }
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.byte 0x0e, 0x00, 0x05, 0x16
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.byte 0x00, 0x00, 0x00, 0x00
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.byte 0x74, 0x2e, 0x63, 0x70
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.byte 0x70, 0x00, 0xf2, 0xf1
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# BuildInfo (0x1006) {
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# TypeLeafKind: LF_BUILDINFO (0x1603)
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# NumArgs: 5
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# Arguments [
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# ArgType: C:\src\testing (0x1004)
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# ArgType: 0x0
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# ArgType: t.cpp (0x1005)
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# ArgType: 0x0
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# ArgType: 0x0
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# ]
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# }
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.byte 0x1a, 0x00, 0x03, 0x16
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.byte 0x05, 0x00, 0x04, 0x10
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.byte 0x00, 0x00, 0x00, 0x00
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.byte 0x00, 0x00, 0x05, 0x10
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.byte 0x00, 0x00, 0x00, 0x00
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.byte 0x00, 0x00, 0x00, 0x00
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.byte 0x00, 0x00, 0xf2, 0xf1
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.addrsig

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