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
|
// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_CODEGEN_MACRO_ASSEMBLER_H_
#define V8_CODEGEN_MACRO_ASSEMBLER_H_
#include "src/codegen/turbo-assembler.h"
#include "src/execution/frames.h"
#include "src/heap/heap.h"
// Helper types to make boolean flag easier to read at call-site.
enum InvokeFlag { CALL_FUNCTION, JUMP_FUNCTION };
// Flags used for the AllocateInNewSpace functions.
enum AllocationFlags {
// No special flags.
NO_ALLOCATION_FLAGS = 0,
// The content of the result register already contains the allocation top in
// new space.
RESULT_CONTAINS_TOP = 1 << 0,
// Specify that the requested size of the space to allocate is specified in
// words instead of bytes.
SIZE_IN_WORDS = 1 << 1,
// Align the allocation to a multiple of kDoubleSize
DOUBLE_ALIGNMENT = 1 << 2,
// Directly allocate in old space
PRETENURE = 1 << 3,
};
// This is the only place allowed to include the platform-specific headers.
#define INCLUDED_FROM_MACRO_ASSEMBLER_H
#if V8_TARGET_ARCH_IA32
#include "src/codegen/ia32/macro-assembler-ia32.h"
#elif V8_TARGET_ARCH_X64
#include "src/codegen/x64/macro-assembler-x64.h"
#elif V8_TARGET_ARCH_ARM64
#include "src/codegen/arm64/constants-arm64.h"
#include "src/codegen/arm64/macro-assembler-arm64.h"
#elif V8_TARGET_ARCH_ARM
#include "src/codegen/arm/constants-arm.h"
#include "src/codegen/arm/macro-assembler-arm.h"
#elif V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_PPC64
#include "src/codegen/ppc/constants-ppc.h"
#include "src/codegen/ppc/macro-assembler-ppc.h"
#elif V8_TARGET_ARCH_MIPS
#include "src/codegen/mips/constants-mips.h"
#include "src/codegen/mips/macro-assembler-mips.h"
#elif V8_TARGET_ARCH_MIPS64
#include "src/codegen/mips64/constants-mips64.h"
#include "src/codegen/mips64/macro-assembler-mips64.h"
#elif V8_TARGET_ARCH_S390
#include "src/codegen/s390/constants-s390.h"
#include "src/codegen/s390/macro-assembler-s390.h"
#elif V8_TARGET_ARCH_RISCV64
#include "src/codegen/riscv64/constants-riscv64.h"
#include "src/codegen/riscv64/macro-assembler-riscv64.h"
#else
#error Unsupported target architecture.
#endif
#undef INCLUDED_FROM_MACRO_ASSEMBLER_H
namespace v8 {
namespace internal {
// Maximum number of parameters supported in calls to C/C++. The C++ standard
// defines a limit of 256 parameters but in simulator builds we provide only
// limited support.
#ifdef USE_SIMULATOR
static constexpr int kMaxCParameters = 10;
#else
static constexpr int kMaxCParameters = 256;
#endif
class V8_NODISCARD FrameScope {
public:
explicit FrameScope(TurboAssembler* tasm, StackFrame::Type type)
: tasm_(tasm), type_(type), old_has_frame_(tasm->has_frame()) {
tasm->set_has_frame(true);
if (type != StackFrame::MANUAL && type_ != StackFrame::NONE) {
tasm->EnterFrame(type);
}
}
~FrameScope() {
if (type_ != StackFrame::MANUAL && type_ != StackFrame::NONE) {
tasm_->LeaveFrame(type_);
}
tasm_->set_has_frame(old_has_frame_);
}
private:
TurboAssembler* tasm_;
StackFrame::Type type_;
bool old_has_frame_;
};
class V8_NODISCARD FrameAndConstantPoolScope {
public:
FrameAndConstantPoolScope(MacroAssembler* masm, StackFrame::Type type)
: masm_(masm),
type_(type),
old_has_frame_(masm->has_frame()),
old_constant_pool_available_(FLAG_enable_embedded_constant_pool &&
masm->is_constant_pool_available()) {
masm->set_has_frame(true);
if (FLAG_enable_embedded_constant_pool) {
masm->set_constant_pool_available(true);
}
if (type_ != StackFrame::MANUAL && type_ != StackFrame::NONE) {
masm->EnterFrame(type, !old_constant_pool_available_);
}
}
~FrameAndConstantPoolScope() {
masm_->LeaveFrame(type_);
masm_->set_has_frame(old_has_frame_);
if (FLAG_enable_embedded_constant_pool) {
masm_->set_constant_pool_available(old_constant_pool_available_);
}
}
private:
MacroAssembler* masm_;
StackFrame::Type type_;
bool old_has_frame_;
bool old_constant_pool_available_;
DISALLOW_IMPLICIT_CONSTRUCTORS(FrameAndConstantPoolScope);
};
// Class for scoping the the unavailability of constant pool access.
class V8_NODISCARD ConstantPoolUnavailableScope {
public:
explicit ConstantPoolUnavailableScope(Assembler* assembler)
: assembler_(assembler),
old_constant_pool_available_(FLAG_enable_embedded_constant_pool &&
assembler->is_constant_pool_available()) {
if (FLAG_enable_embedded_constant_pool) {
assembler->set_constant_pool_available(false);
}
}
~ConstantPoolUnavailableScope() {
if (FLAG_enable_embedded_constant_pool) {
assembler_->set_constant_pool_available(old_constant_pool_available_);
}
}
private:
Assembler* assembler_;
int old_constant_pool_available_;
DISALLOW_IMPLICIT_CONSTRUCTORS(ConstantPoolUnavailableScope);
};
class V8_NODISCARD AllowExternalCallThatCantCauseGC : public FrameScope {
public:
explicit AllowExternalCallThatCantCauseGC(MacroAssembler* masm)
: FrameScope(masm, StackFrame::NONE) {}
};
// Prevent the use of the RootArray during the lifetime of this
// scope object.
class V8_NODISCARD NoRootArrayScope {
public:
explicit NoRootArrayScope(TurboAssembler* masm)
: masm_(masm), old_value_(masm->root_array_available()) {
masm->set_root_array_available(false);
}
~NoRootArrayScope() { masm_->set_root_array_available(old_value_); }
private:
TurboAssembler* masm_;
bool old_value_;
};
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_MACRO_ASSEMBLER_H_
|
