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[COFF] Add MC support for emitting IMAGE_WEAK_EXTERN_ANTI_DEPENDENCY …
…symbols This is mostly useful for ARM64EC, which uses such symbols extensively. One interesting quirk of ARM64EC is that we need to be able to emit weak symbols that point at each other (so if either symbol is defined elsewhere, both symbols point at the definition). This handling is currently restricted to weak_anti_dep symbols, because we depend on the current behavior of resolving weak symbols in some cases. Differential Revision: https://reviews.llvm.org/D145208
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Original file line number | Diff line number | Diff line change |
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// RUN: llvm-mc -filetype=obj -triple x86_64-pc-win32 %s | llvm-readobj --symbols - | FileCheck %s | ||
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// CHECK: Symbol { | ||
// CHECK-NEXT: Name: .text | ||
// CHECK: Symbol { | ||
// CHECK-NEXT: Name: .data | ||
// CHECK: Symbol { | ||
// CHECK-NEXT: Name: .bss | ||
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.weak_anti_dep a | ||
a = b | ||
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// CHECK: Symbol { | ||
// CHECK-NEXT: Name: a | ||
// CHECK-NEXT: Value: 0 | ||
// CHECK-NEXT: Section: IMAGE_SYM_UNDEFINED (0) | ||
// CHECK-NEXT: BaseType: Null (0x0) | ||
// CHECK-NEXT: ComplexType: Null (0x0) | ||
// CHECK-NEXT: StorageClass: WeakExternal (0x69) | ||
// CHECK-NEXT: AuxSymbolCount: 1 | ||
// CHECK-NEXT: AuxWeakExternal { | ||
// CHECK-NEXT: Linked: b (8) | ||
// CHECK-NEXT: Search: AntiDependency (0x4) | ||
// CHECK-NEXT: } | ||
// CHECK-NEXT: } | ||
// CHECK-NEXT: Symbol { | ||
// CHECK-NEXT: Name: b | ||
// CHECK-NEXT: Value: 0 | ||
// CHECK-NEXT: Section: IMAGE_SYM_UNDEFINED (0) | ||
// CHECK-NEXT: BaseType: Null (0x0) | ||
// CHECK-NEXT: ComplexType: Null (0x0) | ||
// CHECK-NEXT: StorageClass: External (0x2) | ||
// CHECK-NEXT: AuxSymbolCount: 0 | ||
// CHECK-NEXT: } | ||
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.weak_anti_dep r1 | ||
.weak_anti_dep r2 | ||
r1 = r2 | ||
r2 = r1 | ||
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// CHECK: Symbol { | ||
// CHECK-NEXT: Name: r1 | ||
// CHECK-NEXT: Value: 0 | ||
// CHECK-NEXT: Section: IMAGE_SYM_UNDEFINED (0) | ||
// CHECK-NEXT: BaseType: Null (0x0) | ||
// CHECK-NEXT: ComplexType: Null (0x0) | ||
// CHECK-NEXT: StorageClass: WeakExternal (0x69) | ||
// CHECK-NEXT: AuxSymbolCount: 1 | ||
// CHECK-NEXT: AuxWeakExternal { | ||
// CHECK-NEXT: Linked: r2 (11) | ||
// CHECK-NEXT: Search: AntiDependency (0x4) | ||
// CHECK-NEXT: } | ||
// CHECK-NEXT: } | ||
// CHECK-NEXT: Symbol { | ||
// CHECK-NEXT: Name: r2 | ||
// CHECK-NEXT: Value: 0 | ||
// CHECK-NEXT: Section: IMAGE_SYM_UNDEFINED (0) | ||
// CHECK-NEXT: BaseType: Null (0x0) | ||
// CHECK-NEXT: ComplexType: Null (0x0) | ||
// CHECK-NEXT: StorageClass: WeakExternal (0x69) | ||
// CHECK-NEXT: AuxSymbolCount: 1 | ||
// CHECK-NEXT: AuxWeakExternal { | ||
// CHECK-NEXT: Linked: r1 (9) | ||
// CHECK-NEXT: Search: AntiDependency (0x4) | ||
// CHECK-NEXT: } | ||
// CHECK-NEXT: } |