Index: docs/CodeGenerator.rst =================================================================== --- docs/CodeGenerator.rst +++ docs/CodeGenerator.rst @@ -1584,7 +1584,7 @@ A section containing metadata on function stack sizes will be emitted when ``TargetLoweringObjectFile::StackSizesSection`` is not null, and ``TargetOptions::EmitStackSizeSection`` is set (-stack-size-section). The -section will contain an array of pairs of function symbol references (8 byte) +section will contain an array of pairs of function symbol values (pointer size) and stack sizes (unsigned LEB128). The stack size values only include the space allocated in the function prologue. Functions with dynamic stack allocations are not included. Index: docs/CommandGuide/llc.rst =================================================================== --- docs/CommandGuide/llc.rst +++ docs/CommandGuide/llc.rst @@ -135,7 +135,7 @@ .. option:: -stack-size-section Emit the .stack_sizes section which contains stack size metadata. The section - contains an array of pairs of function symbol references (8 byte) and stack + contains an array of pairs of function symbol values (pointer size) and stack sizes (unsigned LEB128). The stack size values only include the space allocated in the function prologue. Functions with dynamic stack allocations are not included. Index: lib/CodeGen/AsmPrinter/AsmPrinter.cpp =================================================================== --- lib/CodeGen/AsmPrinter/AsmPrinter.cpp +++ lib/CodeGen/AsmPrinter/AsmPrinter.cpp @@ -976,8 +976,7 @@ const MCSymbol *FunctionSymbol = getSymbol(&MF.getFunction()); uint64_t StackSize = FrameInfo.getStackSize(); - OutStreamer->EmitValue(MCSymbolRefExpr::create(FunctionSymbol, OutContext), - /* size = */ 8); + OutStreamer->EmitSymbolValue(FunctionSymbol, TM.getPointerSize()); OutStreamer->EmitULEB128IntValue(StackSize); OutStreamer->PopSection(); Index: test/CodeGen/ARM/stack-size-section.ll =================================================================== --- test/CodeGen/ARM/stack-size-section.ll +++ test/CodeGen/ARM/stack-size-section.ll @@ -0,0 +1,30 @@ +; RUN: llc < %s -mtriple=armv7-linux -stack-size-section | FileCheck %s + +; CHECK-LABEL: func1: +; CHECK: .section .stack_sizes,"",%progbits +; CHECK-NEXT: .long func1 +; CHECK-NEXT: .byte 8 +define void @func1(i32, i32) #0 { + alloca i32, align 4 + alloca i32, align 4 + ret void +} + +; CHECK-LABEL: func2: +; CHECK: .section .stack_sizes,"",%progbits +; CHECK-NEXT: .long func2 +; CHECK-NEXT: .byte 16 +define void @func2() #0 { + alloca i32, align 4 + call void @func1(i32 1, i32 2) + ret void +} + +; CHECK-LABEL: dynalloc: +; CHECK-NOT: .section .stack_sizes +define void @dynalloc(i32 %N) #0 { + alloca i32, i32 %N + ret void +} + +attributes #0 = { "no-frame-pointer-elim"="true" }