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[lld-macho] Implement -dependency_info (partially - more opcodes needed)

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Bug: https://bugs.llvm.org/show_bug.cgi?id=49278
The flag is not well documented, so this implementation is based on observed behaviour.

When specified, `-dependency_info <path>` produced a text file containing information pertaining to the current linkage, such as input files, output file, linker version, etc.

This file's layout is also not documented, but it seems to be a series of null ('\0') terminated strings in the form `<op code><path>`

`<op code>` could be:
   `0x00` : linker version
   `0x10` : input
   `0x11` : files not found(??)
   `0x40` : output

`<path>` : is the file path, except for the linker-version case.

(??) This part is a bit unclear. I think it means all the files the linker attempted to look at, but could not find.

Differential Revision: https://reviews.llvm.org/D98559
This commit is contained in:
Vy Nguyen
2021-03-12 17:40:37 -05:00
parent 30080b003e
commit c53a1322f3
6 changed files with 190 additions and 3 deletions
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10
lld/MachO/Driver.cpp
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@@ -54,7 +54,8 @@ using namespace llvm::sys;
using namespace lld;
using namespace lld::macho;
Configuration *lld::macho::config;
Configuration *macho::config;
DependencyTracker *macho::depTracker;
static HeaderFileType getOutputType(const InputArgList &args) {
// TODO: -r, -dylinker, -preload...
@@ -84,6 +85,8 @@ findAlongPathsWithExtensions(StringRef name, ArrayRef<StringRef> extensions) {
Twine location = base + ext;
if (fs::exists(location))
return location.str();
else
depTracker->logFileNotFound(location);
}
}
return {};
@@ -815,6 +818,9 @@ bool macho::link(ArrayRef<const char *> argsArr, bool canExitEarly,
symtab = make<SymbolTable>();
target = createTargetInfo(args);
depTracker =
make<DependencyTracker>(args.getLastArgValue(OPT_dependency_info, ""));
config->entry = symtab->addUndefined(args.getLastArgValue(OPT_e, "_main"),
/*file=*/nullptr,
/*isWeakRef=*/false);
@@ -1066,6 +1072,8 @@ bool macho::link(ArrayRef<const char *> argsArr, bool canExitEarly,
// Write to an output file.
writeResult();
depTracker->write(getLLDVersion(), inputFiles, config->outputFile);
}
if (config->timeTraceEnabled) {