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Add a text mode for fingerprinting. (#7231)

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The intent is to add visibility into how the fingerprint is computed, so
that fingerprinting issues and mangling collisions can be more readily
understood and fixed.

Assisted-by: Gemini via Antigravity
This commit is contained in:
Richard Smith
2026-05-19 23:16:51 +00:00
committed by GitHub
parent ce080b3549
commit be70c092fa
19 changed files with 466 additions and 129 deletions
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toolchain/lower/file_context.cpp
+6 -3
View File
@@ -322,7 +322,8 @@ auto FileContext::GetOrCreateLLVMFunction(
sem_ir().clang_decls().Get(clang_decl_id).key.decl->getAsFunction());
}
SemIR::Mangler m(sem_ir(), context().total_ir_count());
SemIR::Mangler m(sem_ir(), context().total_ir_count(),
context().mangle_string_fingerprint());
std::string mangled_name = m.Mangle(function_id, specific_id);
if (auto* existing = llvm_module().getFunction(mangled_name)) {
// We might have already lowered this function while lowering a different
@@ -691,7 +692,8 @@ auto FileContext::BuildGlobalVariableDecl(SemIR::VarStorage var_storage)
auto FileContext::BuildNonCppGlobalVariableDecl(SemIR::VarStorage var_storage)
-> llvm::GlobalVariable* {
SemIR::Mangler m(sem_ir(), context().total_ir_count());
SemIR::Mangler m(sem_ir(), context().total_ir_count(),
context().mangle_string_fingerprint());
auto mangled_name = m.MangleGlobalVariable(var_storage.pattern_id);
auto linkage = llvm::GlobalVariable::ExternalLinkage;
@@ -726,7 +728,8 @@ auto FileContext::BuildVtable(const SemIR::Vtable& vtable,
}
const auto& class_info = sem_ir().classes().Get(vtable.class_id);
SemIR::Mangler m(sem_ir(), context().total_ir_count());
SemIR::Mangler m(sem_ir(), context().total_ir_count(),
context().mangle_string_fingerprint());
std::string mangled_name = m.MangleVTable(class_info, specific_id);
if (sem_ir()