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Support segmented stacks on win32.

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Uses the pvArbitrary slot of the TIB, which is reserved for applications. We
only support frames with a static size.

llvm-svn: 148040
This commit is contained in:
Rafael Espindola 2012-01-12 20:22:08 +00:00
parent 807fee533d
commit dda46f4081
2 changed files with 67 additions and 7 deletions
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24
lib/Target/X86/X86FrameLowering.cpp
View File

@ -1357,8 +1357,8 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
if (MF.getFunction()->isVarArg())
report_fatal_error("Segmented stacks do not support vararg functions.");
if (!ST->isTargetLinux() && !ST->isTargetDarwin())
report_fatal_error("Segmented stacks supported only on linux and darwin.");
if (!ST->isTargetLinux() && !ST->isTargetDarwin() && !ST->isTargetWin32())
report_fatal_error("Segmented stacks supported only on linux, darwin and win32.");
MachineBasicBlock *allocMBB = MF.CreateMachineBasicBlock();
MachineBasicBlock *checkMBB = MF.CreateMachineBasicBlock();
@ -1401,6 +1401,8 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
} else if (ST->isTargetDarwin()) {
TlsReg = X86::GS;
TlsOffset = 0x60 + 90*8; // See pthread_machdep.h. Steal TLS slot 90.
} else {
report_fatal_error("Segmented stacks not supported on this platform.");
}
if (CompareStackPointer)
@ -1412,7 +1414,18 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
BuildMI(checkMBB, DL, TII.get(X86::CMP64rm)).addReg(ScratchReg)
.addReg(0).addImm(1).addReg(0).addImm(TlsOffset).addReg(TlsReg);
} else {
TlsReg = X86::GS;
if (ST->isTargetLinux()) {
TlsReg = X86::GS;
TlsOffset = 0x30;
} else if (ST->isTargetDarwin()) {
TlsReg = X86::GS;
TlsOffset = 0x48 + 90*4;
} else if (ST->isTargetWin32()) {
TlsReg = X86::FS;
TlsOffset = 0x14; // pvArbitrary, reserved for application use
} else {
report_fatal_error("Segmented stacks not supported on this platform.");
}
if (CompareStackPointer)
ScratchReg = X86::ESP;
@ -1420,13 +1433,10 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
BuildMI(checkMBB, DL, TII.get(X86::LEA32r), ScratchReg).addReg(X86::ESP)
.addImm(1).addReg(0).addImm(-StackSize).addReg(0);
if (ST->isTargetLinux()) {
TlsOffset = 0x30;
if (ST->isTargetLinux() || ST->isTargetWin32()) {
BuildMI(checkMBB, DL, TII.get(X86::CMP32rm)).addReg(ScratchReg)
.addReg(0).addImm(0).addReg(0).addImm(TlsOffset).addReg(TlsReg);
} else if (ST->isTargetDarwin()) {
TlsOffset = 0x48 + 90*4;
// TlsOffset doesn't fit into a mod r/m byte so we need an extra register
unsigned ScratchReg2;

50
test/CodeGen/X86/segmented-stacks.ll
View File

@ -2,12 +2,14 @@
; RUN: llc < %s -mtriple=x86_64-linux -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64-Linux
; RUN: llc < %s -mtriple=i686-darwin -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32-Darwin
; RUN: llc < %s -mtriple=x86_64-darwin -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64-Darwin
; RUN: llc < %s -mtriple=i686-mingw32 -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32-MinGW
; We used to crash with filetype=obj
; RUN: llc < %s -mtriple=i686-linux -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=x86_64-linux -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=i686-darwin -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=x86_64-darwin -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=i686-mingw32 -segmented-stacks -filetype=obj
; Just to prevent the alloca from being optimized away
declare void @dummy_use(i32*, i32)
@ -58,6 +60,16 @@ define void @test_basic() {
; X64-Darwin-NEXT: callq ___morestack
; X64-Darwin-NEXT: ret
; X32-MinGW: test_basic:
; X32-MinGW: cmpl %fs:20, %esp
; X32-MinGW-NEXT: ja LBB0_2
; X32-MinGW: pushl $0
; X32-MinGW-NEXT: pushl $48
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
}
define i32 @test_nested(i32 * nest %closure, i32 %other) {
@ -102,6 +114,14 @@ define i32 @test_nested(i32 * nest %closure, i32 %other) {
; X64-Darwin-NEXT: ret
; X64-Darwin-NEXT: movq %rax, %r10
; X32-MinGW: cmpl %fs:20, %esp
; X32-MinGW-NEXT: ja LBB1_2
; X32-MinGW: pushl $4
; X32-MinGW-NEXT: pushl $0
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
}
define void @test_large() {
@ -146,6 +166,15 @@ define void @test_large() {
; X64-Darwin-NEXT: callq ___morestack
; X64-Darwin-NEXT: ret
; X32-MinGW: leal -40008(%esp), %ecx
; X32-MinGW-NEXT: cmpl %fs:20, %ecx
; X32-MinGW-NEXT: ja LBB2_2
; X32-MinGW: pushl $0
; X32-MinGW-NEXT: pushl $40008
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
}
define fastcc void @test_fastcc() {
@ -194,6 +223,16 @@ define fastcc void @test_fastcc() {
; X64-Darwin-NEXT: callq ___morestack
; X64-Darwin-NEXT: ret
; X32-MinGW: test_fastcc:
; X32-MinGW: cmpl %fs:20, %esp
; X32-MinGW-NEXT: ja LBB3_2
; X32-MinGW: pushl $0
; X32-MinGW-NEXT: pushl $48
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
}
define fastcc void @test_fastcc_large() {
@ -246,6 +285,17 @@ define fastcc void @test_fastcc_large() {
; X64-Darwin-NEXT: callq ___morestack
; X64-Darwin-NEXT: ret
; X32-MinGW: test_fastcc_large:
; X32-MinGW: leal -40008(%esp), %eax
; X32-MinGW-NEXT: cmpl %fs:20, %eax
; X32-MinGW-NEXT: ja LBB4_2
; X32-MinGW: pushl $0
; X32-MinGW-NEXT: pushl $40008
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
}
define fastcc void @test_fastcc_large_with_ecx_arg(i32 %a) {