1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
//===-- RenderScriptExpressionOpts.cpp ------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <string>
#include "llvm/ADT/None.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "clang/Basic/TargetOptions.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/Log.h"
#include "RenderScriptExpressionOpts.h"
#include "RenderScriptRuntime.h"
#include "RenderScriptx86ABIFixups.h"
using namespace lldb_private;
using namespace lldb_renderscript;
// [``slang``](https://android.googlesource.com/platform/frameworks/compile/slang),
// the compiler frontend for RenderScript embeds an ARM specific triple in IR
// that is shipped in the app, after generating IR that has some assumptions
// that an ARM device is the target. As the IR is then compiled on a device of
// unknown (at time the IR was generated at least) architecture, when calling
// RenderScript API function as part of debugger expressions, we have to
// perform a fixup pass that removes those assumptions right before the module
// is sent to be generated by the llvm backend.
namespace {
bool registerRSDefaultTargetOpts(clang::TargetOptions &proto,
const llvm::Triple::ArchType &arch) {
switch (arch) {
case llvm::Triple::ArchType::x86:
proto.Triple = "i686--linux-android";
proto.CPU = "atom";
proto.Features.push_back("+long64");
// Fallthrough for common x86 family features
LLVM_FALLTHROUGH;
case llvm::Triple::ArchType::x86_64:
proto.Features.push_back("+mmx");
proto.Features.push_back("+sse");
proto.Features.push_back("+sse2");
proto.Features.push_back("+sse3");
proto.Features.push_back("+ssse3");
proto.Features.push_back("+sse4.1");
proto.Features.push_back("+sse4.2");
break;
case llvm::Triple::ArchType::mipsel:
// pretend this is `arm' for the front-end
proto.Triple = "armv7-none-linux-android";
proto.CPU = "";
proto.Features.push_back("+long64");
break;
case llvm::Triple::ArchType::mips64el:
// pretend this is `aarch64' for the front-end
proto.Triple = "aarch64-none-linux-android";
proto.CPU = "";
break;
default:
return false;
}
return true;
}
} // end anonymous namespace
bool RenderScriptRuntimeModulePass::runOnModule(llvm::Module &module) {
bool changed_module = false;
Log *log(
GetLogIfAllCategoriesSet(LIBLLDB_LOG_LANGUAGE | LIBLLDB_LOG_EXPRESSIONS));
std::string err;
llvm::StringRef real_triple =
m_process_ptr->GetTarget().GetArchitecture().GetTriple().getTriple();
const llvm::Target *target_info =
llvm::TargetRegistry::lookupTarget(std::string(real_triple), err);
if (!target_info) {
if (log)
log->Warning("couldn't determine real target architecture: '%s'",
err.c_str());
return false;
}
llvm::Optional<llvm::Reloc::Model> reloc_model = llvm::None;
assert(m_process_ptr && "no available lldb process");
switch (m_process_ptr->GetTarget().GetArchitecture().GetMachine()) {
case llvm::Triple::ArchType::x86:
changed_module |= fixupX86FunctionCalls(module);
// For some reason this triple gets totally missed by the backend, and must
// be set manually. There a reference in bcc/Main.cpp about auto feature-
// detection being removed from LLVM3.5, but I can't see that discussion
// anywhere public.
real_triple = "i686--linux-android";
break;
case llvm::Triple::ArchType::x86_64:
changed_module |= fixupX86_64FunctionCalls(module);
break;
case llvm::Triple::ArchType::mipsel:
case llvm::Triple::ArchType::mips64el:
// No actual IR fixup pass is needed on MIPS, but the datalayout and
// targetmachine do need to be explicitly set.
// bcc explicitly compiles MIPS code to use the static relocation model due
// to an issue with relocations in mclinker. see
// libbcc/support/CompilerConfig.cpp for details
reloc_model = llvm::Reloc::Static;
changed_module = true;
break;
case llvm::Triple::ArchType::arm:
case llvm::Triple::ArchType::aarch64:
// ARM subtargets need no fixup passes as they are the initial target as
// generated by the
// slang compiler frontend.
break;
default:
if (log)
log->Warning("Ignoring unknown renderscript target");
return false;
}
if (changed_module) {
llvm::TargetOptions options;
llvm::TargetMachine *target_machine = target_info->createTargetMachine(
real_triple, "", "", options, reloc_model);
assert(target_machine &&
"failed to identify RenderScriptRuntime target machine");
// We've been using a triple and datalayout of some ARM variant all along,
// so we need to let the backend know that this is no longer the case.
if (log) {
LLDB_LOGF(log, "%s - Changing RS target triple to '%s'", __FUNCTION__,
real_triple.str().c_str());
LLDB_LOGF(
log, "%s - Changing RS datalayout to '%s'", __FUNCTION__,
target_machine->createDataLayout().getStringRepresentation().c_str());
}
module.setTargetTriple(real_triple);
module.setDataLayout(target_machine->createDataLayout());
}
return changed_module;
}
char RenderScriptRuntimeModulePass::ID = 0;
namespace lldb_private {
bool RenderScriptRuntime::GetOverrideExprOptions(clang::TargetOptions &proto) {
auto *process = GetProcess();
assert(process);
return registerRSDefaultTargetOpts(
proto, process->GetTarget().GetArchitecture().GetMachine());
}
bool RenderScriptRuntime::GetIRPasses(LLVMUserExpression::IRPasses &passes) {
if (!m_ir_passes)
m_ir_passes = new RSIRPasses(GetProcess());
assert(m_ir_passes);
passes.EarlyPasses = m_ir_passes->EarlyPasses;
passes.LatePasses = m_ir_passes->LatePasses;
return true;
}
namespace lldb_renderscript {
RSIRPasses::RSIRPasses(Process *process) {
IRPasses();
assert(process);
EarlyPasses = std::make_shared<llvm::legacy::PassManager>();
assert(EarlyPasses);
EarlyPasses->add(new RenderScriptRuntimeModulePass(process));
}
RSIRPasses::~RSIRPasses() = default;
} // namespace lldb_renderscript
} // namespace lldb_private
|
