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llvm-mc: Improve indirect symbol support (add the indirect index table).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80059 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-08-26 00:18:21 +00:00
parent 0084ace949
commit ad7c3d5593
3 changed files with 332 additions and 11 deletions
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68
lib/MC/MCAssembler.cpp
View File

@ -70,6 +70,13 @@ class MachObjectWriter {
STF_PrivateExtern = 0x10
};
/// IndirectSymbolFlags - Flags for encoding special values in the indirect
/// symbol entry.
enum IndirectSymbolFlags {
ISF_Local = 0x80000000,
ISF_Absolute = 0x40000000
};
/// MachSymbolData - Helper struct for containing some precomputed information
/// on symbols.
struct MachSymbolData {
@ -315,7 +322,8 @@ public:
Write32(0); // FIXME: Value
}
void BindIndirectSymbols(MCAssembler &Asm) {
void BindIndirectSymbols(MCAssembler &Asm,
DenseMap<MCSymbol*, MCSymbolData*> &SymbolMap) {
// This is the point where 'as' creates actual symbols for indirect symbols
// (in the following two passes). It would be easier for us to do this
// sooner when we see the attribute, but that makes getting the order in the
@ -323,13 +331,6 @@ public:
//
// FIXME: Revisit this when the dust settles.
// FIXME: This should not be needed.
DenseMap<MCSymbol*, MCSymbolData *> SymbolMap;
for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
ie = Asm.symbol_end(); it != ie; ++it)
SymbolMap[&it->getSymbol()] = it;
// Bind non lazy symbol pointers first.
for (MCAssembler::indirect_symbol_iterator it = Asm.indirect_symbol_begin(),
ie = Asm.indirect_symbol_end(); it != ie; ++it) {
@ -474,7 +475,16 @@ public:
void WriteObject(MCAssembler &Asm) {
unsigned NumSections = Asm.size();
BindIndirectSymbols(Asm);
// Compute the symbol -> symbol data map.
//
// FIXME: This should not be here.
DenseMap<MCSymbol*, MCSymbolData *> SymbolMap;
for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
ie = Asm.symbol_end(); it != ie; ++it)
SymbolMap[&it->getSymbol()] = it;
// Create symbol data for any indirect symbols.
BindIndirectSymbols(Asm, SymbolMap);
// Compute symbol table information.
SmallString<256> StringTable;
@ -567,11 +577,47 @@ public:
// Write the symbol table data, if used.
if (NumSymbols) {
// FIXME: We shouldn't need this index table.
DenseMap<MCSymbol*, unsigned> SymbolIndexMap;
for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) {
MCSymbol &Symbol = LocalSymbolData[i].SymbolData->getSymbol();
SymbolIndexMap.insert(std::make_pair(&Symbol, SymbolIndexMap.size()));
}
for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) {
MCSymbol &Symbol = ExternalSymbolData[i].SymbolData->getSymbol();
SymbolIndexMap.insert(std::make_pair(&Symbol, SymbolIndexMap.size()));
}
for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) {
MCSymbol &Symbol = UndefinedSymbolData[i].SymbolData->getSymbol();
SymbolIndexMap.insert(std::make_pair(&Symbol, SymbolIndexMap.size()));
}
// Write the indirect symbol entries.
//
// FIXME: We need the symbol index map for this.
for (unsigned i = 0, e = Asm.indirect_symbol_size(); i != e; ++i)
Write32(0);
for (MCAssembler::indirect_symbol_iterator
it = Asm.indirect_symbol_begin(),
ie = Asm.indirect_symbol_end(); it != ie; ++it) {
// Indirect symbols in the non lazy symbol pointer section have some
// special handling.
const MCSectionMachO &Section =
static_cast<const MCSectionMachO&>(it->SectionData->getSection());
unsigned Type =
Section.getTypeAndAttributes() & MCSectionMachO::SECTION_TYPE;
if (Type == MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS) {
// If this symbol is defined and internal, mark it as such.
if (it->Symbol->isDefined() &&
!SymbolMap.lookup(it->Symbol)->isExternal()) {
uint32_t Flags = ISF_Local;
if (it->Symbol->isAbsolute())
Flags |= ISF_Absolute;
Write32(Flags);
continue;
}
}
Write32(SymbolIndexMap[it->Symbol]);
}
// FIXME: Check that offsets match computed ones.

2
lib/MC/MCMachOStreamer.cpp
View File

@ -168,6 +168,8 @@ void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
// Indirect symbols are handled differently, to match how 'as' handles
// them. This makes writing matching .o files easier.
if (Attribute == MCStreamer::IndirectSymbol) {
// Note that we intentionally cannot use the symbol data here; this is
// important for matching the string table that 'as' generates.
IndirectSymbolData ISD;
ISD.Symbol = Symbol;
ISD.SectionData = CurSectionData;

273
test/MC/MachO/symbol-indirect.s Normal file
View File

@ -0,0 +1,273 @@
// RUN: llvm-mc -triple i386-apple-darwin9 %s -filetype=obj -o - | macho-dump | FileCheck %s
// FIXME: We are missing a lot of diagnostics on this kind of stuff which the
// assembler has.
.lazy_symbol_pointer
.indirect_symbol sym_lsp_B
.long 0
.globl sym_lsp_A
.indirect_symbol sym_lsp_A
.long 0
sym_lsp_C:
.indirect_symbol sym_lsp_C
.long 0
// FIXME: Enable this test once missing llvm-mc support is in place.
.if 0
.indirect_symbol sym_lsp_D
.long sym_lsp_D
.endif
.indirect_symbol sym_lsp_E
.long 0xFA
// FIXME: Enable this test once missing llvm-mc support is in place.
.if 0
sym_lsp_F = 10
.indirect_symbol sym_lsp_F
.long 0
.endif
.globl sym_lsp_G
sym_lsp_G:
.indirect_symbol sym_lsp_G
.long 0
.non_lazy_symbol_pointer
.indirect_symbol sym_nlp_B
.long 0
.globl sym_nlp_A
.indirect_symbol sym_nlp_A
.long 0
sym_nlp_C:
.indirect_symbol sym_nlp_C
.long 0
// FIXME: Enable this test once missing llvm-mc support is in place.
.if 0
.indirect_symbol sym_nlp_D
.long sym_nlp_D
.endif
.indirect_symbol sym_nlp_E
.long 0xAF
// FIXME: Enable this test once missing llvm-mc support is in place.
.if 0
sym_nlp_F = 10
.indirect_symbol sym_nlp_F
.long 0
.endif
.globl sym_nlp_G
sym_nlp_G:
.indirect_symbol sym_nlp_G
.long 0
// CHECK: ('cputype', 7)
// CHECK: ('cpusubtype', 3)
// CHECK: ('filetype', 1)
// CHECK: ('num_load_commands', 1)
// CHECK: ('load_commands_size', 364)
// CHECK: ('flag', 0)
// CHECK: ('load_commands', [
// CHECK: # Load Command 0
// CHECK: (('command', 1)
// CHECK: ('size', 260)
// CHECK: ('segment_name', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('vm_addr', 0)
// CHECK: ('vm_size', 40)
// CHECK: ('file_offset', 392)
// CHECK: ('file_size', 40)
// CHECK: ('maxprot', 7)
// CHECK: ('initprot', 7)
// CHECK: ('num_sections', 3)
// CHECK: ('flags', 0)
// CHECK: ('sections', [
// CHECK: # Section 0
// CHECK: (('section_name', '__text\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('address', 0)
// CHECK: ('size', 0)
// CHECK: ('offset', 392)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 0)
// CHECK: ('num_reloc', 0)
// CHECK: ('flags', 0x80000000)
// CHECK: ('reserved1', 0)
// CHECK: ('reserved2', 0)
// CHECK: ),
// CHECK: # Section 1
// CHECK: (('section_name', '__la_symbol_ptr\x00')
// CHECK: ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('address', 0)
// CHECK: ('size', 20)
// CHECK: ('offset', 392)
// CHECK: ('alignment', 2)
// CHECK: ('reloc_offset', 0)
// CHECK: ('num_reloc', 0)
// CHECK: ('flags', 0x7)
// CHECK: ('reserved1', 0)
// CHECK: ('reserved2', 0)
// CHECK: ),
// CHECK: # Section 2
// CHECK: (('section_name', '__nl_symbol_ptr\x00')
// CHECK: ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// FIXME: Enable this when fixed!
// CHECX: ('address', 20)
// CHECK: ('size', 20)
// CHECK: ('offset', 412)
// CHECK: ('alignment', 2)
// CHECK: ('reloc_offset', 0)
// CHECK: ('num_reloc', 0)
// CHECK: ('flags', 0x6)
// FIXME: Enable this when fixed!
// CHECX: ('reserved1', 5)
// CHECK: ('reserved2', 0)
// CHECK: ),
// CHECK: ])
// CHECK: ),
// CHECK: # Load Command 1
// CHECK: (('command', 2)
// CHECK: ('size', 24)
// CHECK: ('symoff', 472)
// CHECK: ('nsyms', 10)
// CHECK: ('stroff', 592)
// CHECK: ('strsize', 104)
// CHECK: ('_string_data', '\x00sym_lsp_A\x00sym_lsp_G\x00sym_nlp_A\x00sym_nlp_G\x00sym_nlp_B\x00sym_nlp_E\x00sym_lsp_B\x00sym_lsp_E\x00sym_lsp_C\x00sym_nlp_C\x00\x00\x00\x00')
// CHECK: ('_symbols', [
// CHECK: # Symbol 0
// CHECK: (('n_strx', 81)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
// FIXME: Enable this when fixed!
// CHECX: ('n_value', 8)
// CHECK: ('_string', 'sym_lsp_C')
// CHECK: ),
// CHECK: # Symbol 1
// CHECK: (('n_strx', 91)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 3)
// CHECK: ('n_desc', 0)
// FIXME: Enable this when fixed!
// CHECX: ('n_value', 28)
// CHECK: ('_string', 'sym_nlp_C')
// CHECK: ),
// CHECK: # Symbol 2
// CHECK: (('n_strx', 11)
// CHECK: ('n_type', 0xf)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
// FIXME: Enable this when fixed!
// CHECX: ('n_value', 16)
// CHECK: ('_string', 'sym_lsp_G')
// CHECK: ),
// CHECK: # Symbol 3
// CHECK: (('n_strx', 31)
// CHECK: ('n_type', 0xf)
// CHECK: ('n_sect', 3)
// CHECK: ('n_desc', 0)
// FIXME: Enable this when fixed!
// CHECX: ('n_value', 36)
// CHECK: ('_string', 'sym_nlp_G')
// CHECK: ),
// CHECK: # Symbol 4
// CHECK: (('n_strx', 1)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 0)
// CHECK: ('_string', 'sym_lsp_A')
// CHECK: ),
// CHECK: # Symbol 5
// CHECK: (('n_strx', 61)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
// CHECK: ('n_desc', 1)
// CHECK: ('n_value', 0)
// CHECK: ('_string', 'sym_lsp_B')
// CHECK: ),
// CHECK: # Symbol 6
// CHECK: (('n_strx', 71)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
// CHECK: ('n_desc', 1)
// CHECK: ('n_value', 0)
// CHECK: ('_string', 'sym_lsp_E')
// CHECK: ),
// CHECK: # Symbol 7
// CHECK: (('n_strx', 21)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 0)
// CHECK: ('_string', 'sym_nlp_A')
// CHECK: ),
// CHECK: # Symbol 8
// CHECK: (('n_strx', 41)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 0)
// CHECK: ('_string', 'sym_nlp_B')
// CHECK: ),
// CHECK: # Symbol 9
// CHECK: (('n_strx', 51)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 0)
// CHECK: ('_string', 'sym_nlp_E')
// CHECK: ),
// CHECK: ])
// CHECK: ),
// CHECK: # Load Command 2
// CHECK: (('command', 11)
// CHECK: ('size', 80)
// CHECK: ('ilocalsym', 0)
// CHECK: ('nlocalsym', 2)
// CHECK: ('iextdefsym', 2)
// CHECK: ('nextdefsym', 2)
// CHECK: ('iundefsym', 4)
// CHECK: ('nundefsym', 6)
// CHECK: ('tocoff', 0)
// CHECK: ('ntoc', 0)
// CHECK: ('modtaboff', 0)
// CHECK: ('nmodtab', 0)
// CHECK: ('extrefsymoff', 0)
// CHECK: ('nextrefsyms', 0)
// CHECK: ('indirectsymoff', 432)
// CHECK: ('nindirectsyms', 10)
// CHECK: ('extreloff', 0)
// CHECK: ('nextrel', 0)
// CHECK: ('locreloff', 0)
// CHECK: ('nlocrel', 0)
// CHECK: ('_indirect_symbols', [
// CHECK: # Indirect Symbol 0
// CHECK: (('symbol_index', 5),),
// CHECK: # Indirect Symbol 1
// CHECK: (('symbol_index', 4),),
// CHECK: # Indirect Symbol 2
// CHECK: (('symbol_index', 0),),
// CHECK: # Indirect Symbol 3
// CHECK: (('symbol_index', 6),),
// CHECK: # Indirect Symbol 4
// CHECK: (('symbol_index', 2),),
// CHECK: # Indirect Symbol 5
// CHECK: (('symbol_index', 8),),
// CHECK: # Indirect Symbol 6
// CHECK: (('symbol_index', 7),),
// CHECK: # Indirect Symbol 7
// CHECK: (('symbol_index', 2147483648),),
// CHECK: # Indirect Symbol 8
// CHECK: (('symbol_index', 9),),
// CHECK: # Indirect Symbol 9
// CHECK: (('symbol_index', 3),),
// CHECK: ])
// CHECK: ),
// CHECK: ])