This revision was automatically updated to reflect the committed changes.
Closed by commit rGc9b36a041fd7: Support GCC's -fstack-usage flag
(authored by pzheng).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D100509/new/
https://reviews.llvm.org/D100509
Files:
clang/docs/ReleaseNotes.rst
clang/include/clang/Basic/CodeGenOptions.h
clang/include/clang/Driver/Options.td
clang/lib/CodeGen/BackendUtil.cpp
clang/lib/Driver/ToolChains/Clang.cpp
clang/lib/Frontend/CompilerInvocation.cpp
clang/test/CodeGen/stack-usage.c
clang/test/Driver/stack-usage.c
llvm/include/llvm/CodeGen/AsmPrinter.h
llvm/include/llvm/Target/TargetOptions.h
llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Index: llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
===================================================================
--- llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1185,6 +1185,37 @@
OutStreamer->PopSection();
}
+void AsmPrinter::emitStackUsage(const MachineFunction &MF) {
+ const std::string &OutputFilename = MF.getTarget().Options.StackUsageOutput;
+
+ // OutputFilename empty implies -fstack-usage is not passed.
+ if (OutputFilename.empty())
+ return;
+
+ const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
+ uint64_t StackSize = FrameInfo.getStackSize();
+
+ if (StackUsageStream == nullptr) {
+ std::error_code EC;
+ StackUsageStream =
+ std::make_unique<raw_fd_ostream>(OutputFilename, EC, sys::fs::OF_Text);
+ if (EC) {
+ errs() << "Could not open file: " << EC.message();
+ return;
+ }
+ }
+
+ *StackUsageStream << MF.getFunction().getParent()->getName();
+ if (const DISubprogram *DSP = MF.getFunction().getSubprogram())
+ *StackUsageStream << ':' << DSP->getLine();
+
+ *StackUsageStream << ':' << MF.getName() << '\t' << StackSize << '\t';
+ if (FrameInfo.hasVarSizedObjects())
+ *StackUsageStream << "dynamic\n";
+ else
+ *StackUsageStream << "static\n";
+}
+
static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF) {
MachineModuleInfo &MMI = MF.getMMI();
if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI.hasDebugInfo())
@@ -1469,6 +1500,9 @@
// Emit section containing stack size metadata.
emitStackSizeSection(*MF);
+ // Emit .su file containing function stack size information.
+ emitStackUsage(*MF);
+
emitPatchableFunctionEntries();
if (isVerbose())
Index: llvm/include/llvm/Target/TargetOptions.h
===================================================================
--- llvm/include/llvm/Target/TargetOptions.h
+++ llvm/include/llvm/Target/TargetOptions.h
@@ -342,6 +342,11 @@
/// Stack protector guard reg to use, e.g. usually fs or gs in X86.
std::string StackProtectorGuardReg = "None";
+ /// Name of the stack usage file (i.e., .su file) if user passes
+ /// -fstack-usage. If empty, it can be implied that -fstack-usage is not
+ /// passed on the command line.
+ std::string StackUsageOutput;
+
/// FloatABIType - This setting is set by -float-abi=xxx option is specfied
/// on the command line. This setting may either be Default, Soft, or Hard.
/// Default selects the target's default behavior. Soft selects the ABI for
Index: llvm/include/llvm/CodeGen/AsmPrinter.h
===================================================================
--- llvm/include/llvm/CodeGen/AsmPrinter.h
+++ llvm/include/llvm/CodeGen/AsmPrinter.h
@@ -182,6 +182,9 @@
/// Emit comments in assembly output if this is true.
bool VerboseAsm;
+ /// Output stream for the stack usage file (i.e., .su file).
+ std::unique_ptr<raw_fd_ostream> StackUsageStream;
+
static char ID;
protected:
@@ -358,6 +361,8 @@
void emitStackSizeSection(const MachineFunction &MF);
+ void emitStackUsage(const MachineFunction &MF);
+
void emitBBAddrMapSection(const MachineFunction &MF);
void emitPseudoProbe(const MachineInstr &MI);
Index: clang/test/Driver/stack-usage.c
===================================================================
--- /dev/null
+++ clang/test/Driver/stack-usage.c
@@ -0,0 +1,7 @@
+// RUN: %clang -target aarch64-unknown %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ABSENT
+// CHECK-ABSENT-NOT: "-stack-usage-file"
+
+// RUN: %clang -target aarch64-unknown -fstack-usage %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-PRESENT
+// CHECK-PRESENT: "-stack-usage-file"
+
+int foo() { return 42; }
Index: clang/test/CodeGen/stack-usage.c
===================================================================
--- /dev/null
+++ clang/test/CodeGen/stack-usage.c
@@ -0,0 +1,19 @@
+// REQUIRES: aarch64-registered-target
+
+// RUN: rm -rf %t && mkdir %t && cd %t
+// RUN: %clang_cc1 -triple aarch64-unknown -stack-usage-file b.su -emit-obj %s -o b.o
+// RUN: FileCheck %s < b.su
+
+// CHECK: stack-usage.c:[[#@LINE+1]]:foo {{[0-9]+}} static
+int foo() {
+ char a[8];
+
+ return 0;
+}
+
+// CHECK: stack-usage.c:[[#@LINE+1]]:bar {{[0-9]+}} dynamic
+int bar(int len) {
+ char a[len];
+
+ return 1;
+}
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -1931,6 +1931,9 @@
if (UsingSampleProfile)
NeedLocTracking = true;
+ if (!Opts.StackUsageOutput.empty())
+ NeedLocTracking = true;
+
// If the user requested a flag that requires source locations available in
// the backend, make sure that the backend tracks source location information.
if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -5492,6 +5492,18 @@
options::OPT_fno_stack_size_section, RawTriple.isPS4()))
CmdArgs.push_back("-fstack-size-section");
+ if (Args.hasArg(options::OPT_fstack_usage)) {
+ CmdArgs.push_back("-stack-usage-file");
+
+ if (Arg *OutputOpt = Args.getLastArg(options::OPT_o)) {
+ SmallString<128> OutputFilename(OutputOpt->getValue());
+ llvm::sys::path::replace_extension(OutputFilename, "su");
+ CmdArgs.push_back(Args.MakeArgString(OutputFilename));
+ } else
+ CmdArgs.push_back(
+ Args.MakeArgString(Twine(getBaseInputStem(Args, Inputs)) + ".su"));
+ }
+
CmdArgs.push_back("-ferror-limit");
if (Arg *A = Args.getLastArg(options::OPT_ferror_limit_EQ))
CmdArgs.push_back(A->getValue());
Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -567,6 +567,7 @@
Options.ExplicitEmulatedTLS = CodeGenOpts.ExplicitEmulatedTLS;
Options.DebuggerTuning = CodeGenOpts.getDebuggerTuning();
Options.EmitStackSizeSection = CodeGenOpts.StackSizeSection;
+ Options.StackUsageOutput = CodeGenOpts.StackUsageOutput;
Options.EmitAddrsig = CodeGenOpts.Addrsig;
Options.ForceDwarfFrameSection = CodeGenOpts.ForceDwarfFrameSection;
Options.EmitCallSiteInfo = CodeGenOpts.EmitCallSiteInfo;
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -2709,6 +2709,12 @@
CodeGenOpts<"StackSizeSection">, DefaultFalse,
PosFlag<SetTrue, [CC1Option], "Emit section containing metadata on function stack sizes">,
NegFlag<SetFalse>>;
+def fstack_usage : Flag<["-"], "fstack-usage">, Group<f_Group>,
+ HelpText<"Emit .su file containing information on function stack sizes">;
+def stack_usage_file : Separate<["-"], "stack-usage-file">,
+ Flags<[CC1Option, NoDriverOption]>,
+ HelpText<"Filename (or -) to write stack usage output to">,
+ MarshallingInfoString<CodeGenOpts<"StackUsageOutput">>;
defm unique_basic_block_section_names : BoolFOption<"unique-basic-block-section-names",
CodeGenOpts<"UniqueBasicBlockSectionNames">, DefaultFalse,
Index: clang/include/clang/Basic/CodeGenOptions.h
===================================================================
--- clang/include/clang/Basic/CodeGenOptions.h
+++ clang/include/clang/Basic/CodeGenOptions.h
@@ -372,6 +372,11 @@
/// coverage pass should actually not be instrumented.
std::vector<std::string> SanitizeCoverageIgnorelistFiles;
+ /// Name of the stack usage file (i.e., .su file) if user passes
+ /// -fstack-usage. If empty, it can be implied that -fstack-usage is not
+ /// passed on the command line.
+ std::string StackUsageOutput;
+
/// Executable and command-line used to create a given CompilerInvocation.
/// Most of the time this will be the full -cc1 command.
const char *Argv0 = nullptr;
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -70,6 +70,10 @@
- ``-Wreserved-identifier`` emits warning when user code uses reserved
identifiers.
+- ``-fstack-usage`` generates an extra .su file per input source file. The .su
+ file contains frame size information for each function defined in the source
+ file.
+
Deprecated Compiler Flags
-------------------------
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