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[clang][deps] Prevent emitting diagnostics outside of source file 

The dependency scanner needs to report the module map file describing the module whose implementation is being compiled (see D134222). However, calling `Preprocessor::getCurrentModuleImplementation()` in the scanner might cause a diagnostic during module map parsing and emitting a diagnostic without being "in" a source file is illegal (e.g. in `TextDiagnosticPrinter`). This patch ensures the module map parse is triggered while the compiler is still "in" a source file, avoiding the failure case.

Reviewed By: Bigcheese

Differential Revision: https://reviews.llvm.org/D135637
This commit is contained in:
Jan Svoboda 2022-10-11 15:38:48 -07:00
parent 060b25346b
commit c1c72302fe
2 changed files with 41 additions and 0 deletions
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3
clang/lib/Frontend/FrontendAction.cpp
View File

@ -914,6 +914,9 @@ bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
CI.getDiagnostics().Report(diag::err_module_map_not_found) << Filename;
}
// If compiling implementation of a module, load its module map file now.
(void)CI.getPreprocessor().getCurrentModuleImplementation();
// Add a module declaration scope so that modules from -fmodule-map-file
// arguments may shadow modules found implicitly in search paths.
CI.getPreprocessor()

38
clang/test/ClangScanDeps/modules-implementation-module-map.c Normal file
View File

@ -0,0 +1,38 @@
// RUN: rm -rf %t
// RUN: split-file %s %t
//--- cdb.json.template
[{
"file": "DIR/tu.m",
"directory": "DIR",
"command": "clang -fmodules -fimplicit-module-maps -fmodules-cache-path=DIR/cache -fmodule-name=FWPrivate -c DIR/tu.m -o DIR/tu.o -F DIR/frameworks -Wprivate-module"
}]
//--- frameworks/FW.framework/Modules/module.modulemap
framework module FW {}
//--- frameworks/FW.framework/Modules/module.private.modulemap
// The module name will trigger a diagnostic.
framework module FWPrivate { header "private.h" }
//--- frameworks/FW.framework/PrivateHeaders/private.h
//--- tu.m
// RUN: sed -e "s|DIR|%/t|g" %t/cdb.json.template > %t/cdb.json
// RUN: clang-scan-deps -compilation-database %t/cdb.json -format experimental-full > %t/result.json
// RUN: cat %t/result.json | sed 's:\\\\\?:/:g' | FileCheck %s -DPREFIX=%/t
// CHECK: "translation-units": [
// CHECK-NEXT: {
// CHECK-NEXT: "commands": [
// CHECK: {
// CHECK: "command-line": [
// CHECK: "-fmodule-map-file=[[PREFIX]]/frameworks/FW.framework/Modules/module.private.modulemap",
// CHECK: "-fmodule-name=FWPrivate",
// CHECK: ],
// CHECK-NEXT: "executable": "clang",
// CHECK-NEXT: "file-deps": [
// CHECK-NEXT: "[[PREFIX]]/tu.m"
// CHECK-NEXT: ],
// CHECK-NEXT: "input-file": "[[PREFIX]]/tu.m"
// CHECK-NEXT: }
// CHECK: ]
// CHECK: }
// CHECK: ]